Press Alt + R to read the document text or Alt + P to download or print.
This document contains no pages.
HomeMy WebLinkAboutR-TIR-Forest Terrace_2020-07-14_APPROVED
TECHNICAL INFORMATION REPORT
Forest Terrace
2611 Union Avenue N.E.
Renton, Washington
Prepared for:
Pulte Group, Inc.
3535 Factoria BLVD S.E., #600
Bellevue, WA 98006
October 22, 2018
Revised April 28, 2020
Revised July 14, 2020
Our Job No. 18396
07/14/20
SURFACE WATER UTILITY
jfarah 09/09/2020
APPROVED
09/11/2020 msippo
DEVELOPMENT ENGINEERING DIVISION
TECHNICAL INFORMATION REPORT Forest Terrace City of Renton, Washington Our Job No. 18396
18396.003.TIR.doc
TABLE OF CONTENTS
1.0 PROJECT OVERVIEW
Figure 1.0.1 – Technical Information Report (TIR) Worksheet
Figure 1.0.2 – Vicinity Map
Figure 1.0.3 – Predeveloped Drainage Basin Map
Figure 1.0.4 – Soils
Figure 1.0.5 – Assessor's Map
Figure 1.0.6 – FEMA Map
Figure 1.0.7 – Sensitive Area Map
Figure 1.0.8 – Downstream Basin Map
2.0 CONDITIONS AND REQUIREMENTS SUMMARY
2.1 Analysis of the Core Requirements and Special Requirements
3.0 OFF-SITE ANALYSIS
4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN
4.1 Existing Site Hydrology
4.2 Developed Site Hydrology
Figure 4.2.1 –Developed Drainage Basin Map
Figure 4.2.2 –Upstream Drainage Basin Map
4.3 Performance Standards
4.4 Flow Control System
Figure 4.4.1 –Riser Inflow Curves
Figure 4.4.2 – Detention Vault Sizing Calculations
Figure 4.4.3 – Upstream Bypass Sizing Calculations
Figure 4.4.4 – Storm Facilities Layout
4.5 Water Quality System
Figure 4.5.1 –Water Quality Treatment Facility Selection Flow Chart
Figure 4.5.2 –Water Quality Contech Stormfilter ZPG GULD
5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN
Figure 5.0.1 – Conveyance Analysis
Figure 5.0.2 – Backwater Analysis
18396.003.TIR.doc
Figure 5.0.3 - CB#46 Upstream Bypass Runoff
Figure 5.0.4 - CB#4A Perkins Runoff
6.0 SPECIAL REPORTS AND STUDIES
6.1 Geotechnical Report for Forest Terrace (Vandermay) prepared by Terra Associates, Inc. dated
July 19, 2017
6.2 Geotechnical Report – Protected Slope Analysis for Forest Terrace (Vandermay) prepared by
Terra Associates, Inc. dated June 18, 2017
6.3 Arborist Report – Arborist Report Addendum #2 for Forest Terrace prepared by Tree
Solutions, Inc. dated November 7, 2019
6.4 Arborist Report – Arborist Report Addendum #3 for Forest Terrace prepared by Tree
Solutions, Inc. dated February 24, 2020
6.5 Geotechnical Engineering Review – Geotechnical Engineering Review prepared by Terra
Associates, Inc. dated February 28, 2020
6.6 Response to City of Renton Comments – Geotechnical Engineering Review prepared by Terra
Associates, Inc. dated February 28, 2020
6.7 Structural Report – Forest Terrace Plat Storm Water Detention Vault prepared by Site
Structures Dated October 21, 2019
6.8 Structural Plans – Forest Terrace Plat Storm Water Detention Vault prepared by Site
Structures Dated February 25, 2020
6.9 National Storm Water Quality Program Storm Water Pollution Prevention Plan (SWPPP) dated
March 11, 2020
7.0 OTHER PERMITS
8.0 ESC ANALYSIS AND DESIGN
Figure 8.0.1 – TESC Analysis
9.0 BOND QUANTITIES AND FACILITY SUMMARIES
Figure 9.0.1 - BMP Covenant
Figure 9.0.2 – Stormwater Facility Summary Sheet
10.0 OPERATIONS AND MAINTENANCE MANUAL
Figure 10.0.1 – Operations and Maintenance Manual
Tab 1.0
18396.003.TIR.doc
1.0 PROJECT OVERVIEW
This section contains the following information:
Figure 1.0.1 – Technical Information Report (TIR) Worksheet
Figure 1.0.2 – Vicinity Map
Figure 1.0.3 – Predeveloped Drainage Basin Map
Figure 1.0.4 – Soils
Figure 1.0.5 – Assessor's Map
Figure 1.0.6 – FEMA Map
Figure 1.0.7 – Sensitive Area Map
Figure 1.0.8 – Downstream Basin Map
18396.003.TIR.doc
1.0 PROJECT OVERVIEW
The Forest Terrace project is a single-family residential project consisting of the development of a
forested area generally located between Union Avenue N.E. to the East, single-family homes to
the North and West, and Sierra Heights Elementary School to the south. More specifically the site
is located at 2611 Union Avenue N.E. Renton, Washington 98059. The project area is
approximately 13.4(±) acres in size. The proposed project is to construct 25 single-family lots with
associated roads, utilities, and stormwater facilities. The project site is located within a portion of
Section 4, Township 23 North, Range 5 East, Willamette Meridian, in the City of Renton,
Washington.
Developable portions of the project will include areas outside of the existing PSE easements and
the area designated for the Perkins property. The property consists of one existing tax parcel
042305-9142 and portions of a second tax parcel 042305-9114. On-site vegetation consists of
native trees such as Fir, Cedar, Hemlock, and Maple ranging in size from saplings up to trunks 64
inches in diameter. Elevations range from 342 to 442 across the site. The site is mostly a steep
hillside with slopes of up to 50 percent on the south side of the site, with some gentler slopes of 5
percent on the northern side of the site.
The King County Soils Conservation Service Soils Map for this area shown in Figure 1.0.4 of this
section indicates that the on-site soils are considered; Alderwood gravelly sandy loam with 8 to
15 percent slopes, Alderwood gravelly sandy loam with 0 to 8 percent slopes, Everett very
gravelly sandy loam with slopes 0 to 8 percent, and Everett very gravelly sandy loam with 15 to
30 percent slopes. Please see the Geotechnical Engineering Study included in Section 6.1 of this
report. Please refer to Figure 1.0.3 of this section for the predeveloped drainage basin map.
On-site construction will include roadways with vertical curb and sidewalk, landscaping tracts, a
water quality facility, and two detention facilities. Additionally, stormwater catch basins and storm
pipes as well as water mains and sewer facilities will be constructed onsite. There will be frontage
improvements along Union Ave NE including stormwater catch basins and storm pipes as well as
pavement overlay, vertical curb and sidewalk. A drainage swale will also be constructed on the
west side of Union Ave NE along the Dalpay Property.
Stormwater runoff generated by the lots, Tracts A and E, NE 27th PL and the frontage area will
be routed to a detention vault. Stormwater not tributary to the detentions vault will be mitigated via
a Mitigation Trade and bypassed the site through level spreaders located in the north portion of
Lot 10, Tract B and stormwater outfall along Union Ave.
The detention vault discharges into a StormFilter for basic water quality treatment. The discharge
from the StormFilter continues to a pipe system in Union Ave NE which routes to a drainage
swale along Union Ave NE, which finally connects to an existing catch basin at the intersection of
Union Ave NE and SE 95th Way. The stormwater continues within the existing drainage system
outlets onto a hillside on the northern part of SE 95th Way, which will eventually flow to May
Creek.
The project will be mass graded to balance cut and fills so that all lots will be level flat pads ready
for home building. Site drainage designs are based on the 2017 Renton Surface Water Design
Manual (RSWDM). Please refer to Section 4.0 of this TIR for further details regarding the
drainage facility design.
-1- 18396.004.Wkst.doc
King County Department of Development and Environmental Services
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT LOCATION AND DESCRIPTION
Project Owner
Pulte Group, Inc
Kyle Lublin Project Name
Address 3535 Factoria BLVD S.E., #600 Forest Terrace
Bellevue, WA 98006 Location 2611 Union Ave NE Renton, WA 98059
Phone (425) 216-3466 Township 23 N
Project Engineer Barry Talkington Range 5E
Company Barghausen Consulting Engineers, Inc. Section 4
Address/Phone 18215 – 72nd Avenue South Section
Kent, WA 98032 / (425) 251-6222
Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS
Subdivision DFW HPA Shoreline Management
Short Subdivision COE 404 Rockery
Grading DOE Dam Safety Structural Vaults
Commercial FEMA Floodplain
Other Lock and
Load Wall
Other COE Wetlands
Part 5 SITE COMMUNITY AND DRAINAGE BASIN
Community
Renton
Drainage Basin
Cedar River/Lake Washington
Part 6 SITE CHARACTERISTICS
River Floodplain
Stream Wetlands
Critical Stream Reach Seeps/Springs
Depressions/Swales High Groundwater Table
Lake Groundwater Recharge
Steep Slopes Other
Ryan Kohlman
425-216-3428
Figure 1.0.1
-2- 18396.004.Wkst.doc
Part 7 SOILS
Soil Type Slopes Erosion Potential Erosive Velocities
Everett gravelly sandy
loam 0 to 30 percent Low
Alderwood gravelly
sandy loam 8 to 30 percent Low
Additional Sheets Attached
Part 8 DEVELOPMENT LIMITATIONS
REFERENCE LIMITATION/SITE CONSTRAINT
Additional Sheets Attached
Part 9 ESC REQUIREMENTS
MINIMUM ESC REQUIREMENTS
DURING CONSTRUCTION
MINIMUM ESC REQUIREMENTS
AFTER CONSTRUCTION
Sedimentation Facilities Stabilize Exposed Surface
Stabilized Construction Entrance Remove and Restore Temporary ESC Facilities
Perimeter Runoff Control Clean and Remove All Silt and Debris
Clearing and Grading Restrictions Ensure Operation of Permanent Facilities
Cover Practices Flag Limits of SAO and Open Space Preservation Areas
Construction Sequence Other
Other
Part 10 SURFACE WATER SYSTEM
Grass Lined Channel Tank Infiltration Method of Analysis
Pipe System Vault Depression WWHM2012
Open Channel Energy Dissipater Flow Dispersal Compensation/Mitigation
Dry Pond Wetland Waiver of Eliminated Site Storage
Wet Pond Stream Regional Detention
Brief Description of System Operation
Stormwater will be conveyed to a Detention vault and Detention Tank, which
will discharge to a stormfilter. From the stormfilter stormwater will flow to an
existing conveyance system on SE 95th Way which empties to May Creek
Facility Related Site Limitations
Reference Facility Limitation
-3- 18396.004.Wkst.doc
Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTS/TRACTS
Cast in Place Vault Drainage Easement
Retaining Wall Access Easement
Rockery > 4' High Native Growth Protection Easement
Structural on Steep Slope Tract
Other Other
Part 13 SIGNATURE OF PROFESSIONAL ENGINEER
I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this
worksheet and the attachments. To the best of my knowledge the information provided here is accurate.
Signed/Dated
11/06/19
Horizontal:
Scale:
Vertical:
For:
Title:
VICINITY MAP
Job Number
N.T.S.N/A 18396
DATE: 10/08/19
Forest Terrace
Renton, Washington
P:\18000s\18396\exhibit\graphics\18396 vmap.cdr
REFERENCE: Rand McNally (2017)
SITE
FIG1.0.2
P
UNION AVE NEIN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLATPULTE GROUP, INC3535 FACTORIA BLVD S.E., #600BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000813/9/2020
FOREST TERRACE PLAT
SCALE: 1"=60'
Horizontal:
Scale:
Vertical:
For:
Title:
SOIL SURVEY MAP
Job Number
N.T.S.N/A 18396
DATE: 10/08/19
Forest Terrace
Renton, Washington
P:\18000s\18396\exhibit\graphics\18396 soil.cdr
REFERENCE: USDA, Natural Resources Conservation Service
LEGEND:
EvB = Everett very gravelly sandy loam, 0-8% slopes
SITE
EvD = Everett very gravelly sandy loam, 15-30% slopes
AgD = Alderwood gravelly sandy loam, 15-30% slopes
AgC = Alderwood gravelly sandy loam, 8-15% slopes
FIG1.0.4
Horizontal:
Scale:
Vertical:
For:
Title:
ASSESSOR MAP
Job Number
N.T.S.N/A 18396
DATE: 10/08/19
Forest Terrace
Renton, Washington
P:\18000s\18396\exhibit\graphics\18396 amap.cdr
SITE
REFERENCE: King County Department of Assessments (Aug. 2017)
FIG
1.0.5
Horizontal:
Scale:
Vertical:
For:
Title:
FEMA MAP
Job Number
N.T.S.N/A 18396
DATE: 10/08/19
Forest Terrace
Renton, Washington
P:\18000s\18396\exhibit\graphics\18396 fema.cdr
REFERENCE: Federal Emergency Management Agency (Portion of Map 53033C0668 F, May 1995)
SITE
Areas determined to be outside 500-year
floodplain.
ZONE X
OTHER AREAS
LEGEND
FIG1.0.6
Horizontal:
Scale:
Vertical:
For:
Title:
SENSITIVE AREAS
MAP
Job Number
N.T.S.N/A 18396
DATE: 10/08/19
Forest Terrace
Renton, Washington
P:\18000s\18396\exhibit\graphics\18396 sens.cdr
SITE
REFERENCE: King County iMAP (2017)
FIG1.0.7
King County
King County iMap
Date: 11/15/2017
Notes:
±The information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King Countymakes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document isnot intended for use as a survey product. King County shall not be liable for any general, special, indirect, incidental, or consequential damages including,but not limited to, lost revenues or lost profits resulting from the use or misuse of the information contained on this map. Any sale of this map or information onthis map is prohibited except by written permission of King County.Union Ave NESE 95th PLNew storm System
connects to existing
conveyance system
through a culvert
from the new swale.
Stormwater outlets from
conveyance system
through open pipe
beneath SE 95th PL. Flow
travels down the hillside
over quarry spalls
Mays Creek is now 1/4
mile down stream of initial
outlet. The stream
continues Wests.
Site
Flow Connects
with Mays
Creek.
May's Creek
May's Creek
FIG
1.0.8
Tab 2.0
18396.003.TIR.doc
2.0 CONDITIONS AND REQUIREMENTS SUMMARY
This section contains the following information:
2.1 Analysis of the Core Requirements and Special Requirements
18396.003.TIR.doc
2.1 Analysis of the Core Requirements and Special Requirements
CORE REQUIREMENTS HOW PROJECT HAS ADDRESSED REQUIREMENT
No. 1: Discharge at Natural
Location
Stormwater from the site will be detained and treated within Tract A
prior to being discharged to May Creek, its natural location.
No. 2: Off-Site Analysis The off-site analysis has been included within Section 3.0 of this
Technical Information Report.
No. 3: Flow Control The Detention Vault was designed for Level 2 duration standard
matching forested site conditions for 50% of the 2 year to the Full
50-year flow. The developed peak discharge rates shall not exceed
predeveloped peak discharge rates for the 2-year to the 10-year
flow.
No. 4: Conveyance System The conveyance and backwater analysis will be designed per the
2017 RSWDM for the proposed storm drainage system, and will be
included in Section 5.0 of this Technical Information Report at final
engineering.
No. 5: Erosion and Sediment
Control
Temporary erosion control measures for this project will include:
stabilized construction entrances, perimeter runoff control, cover
practices, sedimentation facilities, and construction sequencing.
No. 6: Maintenance and
Operations
The City will own and maintain the public drainage facility for this
project. An Operations and Maintenance Manual is located in
Section 10.0 of this Technical Information Report.
No. 7: Bonds and Liability Bonding will be completed as required by the City of Renton using
the city’s Bond Quantity Worksheet.
No. 8: Water Quality The project is proposing a StormFilter for basic water quality in
accordance with the 2017 RSWDM.
No. 9: Onsite Flow Control
BMPs
This project has set a maximum impervious surface of 4,000 sf
per lot. A restrictive covenant will be provided on the final plat.
Individual lot bmps will be evaluated at building permit stage and
may result in a footprint less than 4,000 sf if other bmp methods
cannot be utilized.
All lots will provide perforated stub out connections when tight lined
to the proposed stormwater conveyance system.
All disturbed pervious surfaces shall be to the Soil Amendment
standards.
See section 4.0 of this Technical Information Report for further
details. All disturbed onsite soils will be amended per 2017
RSWDM requirements.
18396.003.TIR.doc
SPECIAL REQUIREMENTS HOW PROJECT HAS ADDRESSED REQUIREMENT
No. 1: Other Adopted Area
Specific Requirements
This special requirement does not apply to this project.
No. 2: Floodplain/Floodway
Delineation
The proposed development is not located within the 100-year
floodplain.
No. 3: Flood Protection
Facilities
This project does not rely on an existing flood protection facility, nor
propose to modify or construct a new flood protection facility;
therefore this special requirement does not apply.
No. 4: Source Controls Source controls, such as covered dumpsters, will be applied to the
project as applicable.
No. 5: Oil Control This site is not classified as a high-use site given the criteria found
in the 2017 RSWDM, therefore no special oil control treatment is
necessary.
No. 6: Aquifer Protection Area This site is not located within an aquifer protection area.
Tab 3.0
18396.003.TIR.doc
3.0 OFF-SITE ANALYSIS
This section contains the following information:
Task 1 – Study Area Definitions and Maps
Task 2 – Resource Review
Task 3 – Field Inspection
3.1 Conveyance System Nuisance Problems (Type 1)
3.2 Severe Erosion Problems (Type 2)
Task 4 – Drainage System Description and Problem Descriptions
18396.003.TIR.doc
TASK 1 – STUDY AREA DEFINITION AND MAPS
The proposed Plat of Forest Terrace is a single-family residential project consisting of 25 lots
zoned R-4. The project is 13(±) acres in size containing one tax parcel: 042305-9142 and
portions of a second tax parcel 042305-9114. The site is located at 2611 Union Ave NE Renton,
Washington 98059 in a portion of Section 4, Township 23 North, Range 5 East, Willamette
Meridian, in the City of Renton, Washington.
The developed portion of the site consists of two single-family homes with driveways and a PSE
easement. Development will take place outside of the PSE Easement and the portion of the site
that will be deeded to the Perkins property.
The site is bordered by single family homes to the North and West, Union Ave NE to the East and
Sierra Heights Elementary School to the South. Onsite soils were found to be a majority classified
as Everett very gravelly sandy loam and Alderwood gravelly sandy loam filling in the edges.
Please refer to the soils map in Section 1, Figure 1.0.4. All drainage calculations were modeled
as till soils.
The topography on site is a very steep hillside with slopes of up to 50 percent in some areas. The
site generally slopes to the North with elevations ranging from 342 to 442 across the site. The
project will be mass graded with cuts and fill balanced on site. A 100-foot wide PSE easement
runs through the eastern portion of the site. Portions of the site will be undisturbed in an attempt
to retain as many existing trees as possible.
The proposed drainage facilities are required to meet the requirements of the 2017 Renton
Surface Water Design Manual (RSWDM). The drainage design shall meet at a minimum flow
control duration standard matching forested condition (previously known as Level 2) and Basic
Water Quality Treatment. One detention vault is proposed to address the stormwater needs of
the site while areas not tributary to the detention vault are handled via a Mitigation Trade
detention tank is proposed to address the stormwater that flows off Road B and Tract B.
Following the detention facility, the controlled stormwater will be conveyed to a StormFilter for
basic water quality treatment before discharging to an existing drainage system, which drains to
May Creek. In the existing condition there is an offsite basin that flows through the site. This area
is collected and routed through the developed site before being released through a dispersal
trench into the PSE easement. Please refer to Section 4.0 for detailed drainage calculations.
UPSTREAM DRAINAGE ANALYSIS
The property is located on a hillside and bordered by Union Ave NE to the east, Sierra Heights
Elementary School to the South, two large lots to the west and north. Since the property is on the
hillside that falls south to north the only possible contributing, basins come from the school
property and some undeveloped portion to the west of the school. The school property consists of
the main school building, a large parking lot, several out buildings and a large baseball and
playfield. The contributing area west of the school property is a forested area that continues, east
to the Puget Sound Energy power easement.
The forested area west of the school property sheet flows on to the property as it flows down the
hill over the existing contours. Runoff from the elementary school playfield flows to one of the
four catchbasins located in relative low points at the edges of the fields as shown in the following
photos.
18396.003.TIR.doc
18396.003.TIR.doc
18396.003.TIR.doc
These drains flow back towards the main school area and connect with the catchbasins located in
the paved play area. These all flow towards a large drainage ditch on the northern border of the
school property, shown in the photos below.
18396.003.TIR.doc
Runoff within the ditch is conveyed out to catchbasins in Union Avenue. From here, the runoff
continues to a 24-inch pipe that flows directly onto the site. The picture below shows the pipe
outlet flowing on to the site.
For further detail, please refer to Section 1.0, Figure 1.0.3 - Predeveloped Drainage Basin.
18396.003.TIR.doc
TASK 2 – RESOURCE REVIEW
Adopted Basin Plans: May Creek is drains to Lake Washington, part of the Cedar River-Lake
Washington Watershed.
Finalized Drainage Studies: This is not applicable.
Basin Reconnaissance Summary Report: This is not applicable.
Critical Drainage Area Maps: This project will discharge into a storm system that discharges to
May Creek, a Class 2 stream, in the Cedar River-Lake Washington Watershed. Prior to
discharge, stormwater shall be released matching historical forested conditions and treated via a
StormFilter. As a result, no critical areas are to be affected.
Floodplain and Floodway FEMA Maps: Please see the attached FEMA Map (Section 1.0) utilized
for this analysis. As indicated on the map, the site is located in Zone X and is outside of the 500-
year flood plain.
Other Off-Site Analysis Reports: A site investigation was conducted in preparation of this Level 1
Off-Site Drainage Analysis. The United States Department of Agriculture Soils Conservation
Service Map is also provided. See Figure 1.0.4 – Soils Map in Section 1.0.
Sensitive Areas Folios: This is not applicable
Road Drainage Problems: This is not applicable.
United States Department of Agriculture King County Soils Survey: Based on the Soils Map for
this area (see Figure 1.0.4 – Soils Map Section 1.0), the majority of the site is located in the soils
configuration known as Everett very gravelly sandy loam, with Alderwood gravelly sandy loam
filling in the edges.
Wetland Inventory Map: Using the King County iMAP applications, there is no known wetland on
this project site.
Migrating River Studies: This is not applicable.
18396.003.TIR.doc
TASK 3 – FIELD INSPECTION
Level 1 Off-site Drainage Analysis:
The field reconnaissance for an initial Level 1 Off-site Drainage Analysis was conducted on
November 28, 2017. On the day of the site visit, conditions were rainy and cool. The proposed
vault outfall will connect with the existing conveyance system at the intersection of Union Ave NE
and SE 95th Way. The existing conveyance system then outlets from a pipe to a hillside north of
SE 95th Way which eventually flows to meet Mays Creek at the base of the hill. The 1/4-mile
downstream flow path begins at this outlet point to Mays Creek. Stormwater flows out from an
open 24-inch pipe located several feet below SE 95th Way and travels directly down the hillside
towards Mays Creek. The stormwater leaves the 24-inch pipe and follows the hillside through an
armored path down to Mays Creek. There were no discernable adverse erosion impacts seen at
the 24-inch outlet at the time of the site visit. We followed the Creek further along its flow path
until it was 1/4-mile away from the outlet pipe. The gradient of Mays Creek over this 1/4-mile
threshold is about 15 feet. There were no erosion control issues along the length of this portion of
Mays Creek. In our professional opinion, there will be no adverse impacts to the downstream
system as a result of this project.
3.1 Conveyance System Nuisance Problems (Type 1)
Conveyance system nuisance problems are minor but not chronic flooding or erosion
problems that result from the overflow of a constructed conveyance system that is
substandard or has become too small as a result of upstream development. Such
problems warrant additional attention because of their chronic nature and because they
result from the failure of a conveyance system to provide a minimum acceptable level of
protection.
There were no conveyance system nuisance problems observed during the November
28, 2017 site visit. This site will match forested durations for 50 percent of the 2-year
through 50-year peaks, not exceeding the 2-year and 10-year storm event. Providing
adequate mitigation to prevent any future drainage complaints as a result of this
proposed site development.
3.2 Severe Erosion Problems (Type 2)
Severe erosion problems can be caused by conveyance system overflow or the
concentration of runoff into erosion-sensitive open drainage features. Severe erosion
problems warrant additional attention because they pose a significant threat either to
health and safety, or to public or private property.
There are no defined drainage channels or ditches that leave the site. All runoff sheet
flows from South to North across the site where it is dispersed into the residential lots
eventually flowing to the conveyance systems on SE 95th Way to the north. The run off
will be collected and conveyed to a detention and water quality facility where it will then
be discharged into an existing conveyance system. This existing conveyance system
outlets to an armored hillside where it then flows down to meet with Mays Creek.
Based on our site visit, there was no evidence of, or potential for, erosion/incision
sufficient to pose a sedimentation hazard downstream within the limits of the study.
Reviewing the King County iMap for drainage complaints it appears that there are no
drainage complaints along the 1/4-mile study area within the past 10-years.
18396.003.TIR.doc
TASK 4 – DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS
DOWNSTREAM DRAINAGE ANALYSIS (LEVEL 1)
The field reconnaissance for the Downstream Analysis was conducted on November 28, 2017. It
was during a moderately heavy rainstorm. Around 3/4" of rain was estimated to fall at this time for
the City of Renton area. The site inspection began at the 24-inch pipe outfall beneath the
guardrail at SE 95th Way and then follows Mays Creek downstream for 1/4-mile. During the field
inspection there was no evidence of any erosion control issues or adverse flooding impacts, nor
are there any expected within Mays Creek as a result of this project.
A series of photographs and descriptions documenting the downstream system as part of this
analysis can be found below.
18396.003.TIR.doc
The above two photos show the 24-inch outlet pipe below the guardrail along SE 95th Way. The
outlet is located several feet below the existing roadway. There is a considerable amount of
vegetation around the outlet. At the time of the site visit there was no visible flow leaving the
outlet pipe.
Above is a photo taken from the 24-inch outlet pipe showing the downhill slope that flows down to
18396.003.TIR.doc
Mays Creek. The slope is heavily vegetated with a path of quarry spalls that leads from the outlet
pipe to protect the slope from erosion. The quarry spalls (pictured below) are scattered along the
hill but are generally concentrated along a flow path down the hillside.
Based on the observations made during this investigation, and the fact that the detention facilities
on site are providing Flow Control Duration Matching Forested Condition Areas and Basic Water
Quality treatment, its determined that this project will have no adverse effects on the downstream
system.
For visual reference of the downstream flow path covered in this Downstream Analysis, please
refer to Figure 1.0.8 – Downstream Basin Map located within Section 1.0 of the report.
Tab 4.0
18396.003.TIR.doc
4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN
This section contains the following information:
4.1 Existing Site Hydrology
4.2 Developed Site Hydrology
4.3 Performance Standards
4.4 Flow Control System
4.5 Water Quality System
18396.003.TIR.doc
4.1 Existing Site Hydrology
The project site is located on the forested hillside West of Union Ave NE and North of Sierra
Heights Elementary School. A 100' PSE Easement bisects the property on the western portion of
the site. Stormwater generally lands on the site and flows from the South to the North down the
hillside and onto the abutting northern properties. There is a catch basin along Union Ave NE in
the Southeast corner of the site that drains stormwater from the School to the north onto the site.
This forms a small creek that flows down the hill and disperses across the site. The proposed
detention systems will be used to mitigate all targeted stormwater onsite and discharge it
downstream on Union Ave NE. Portions of the site that are not tributary to the vault in tract A will
be mitigated via Mitigation trades, any area exceeding the traded areas will be bypassed, please
see section 4.2 Developed site Hydrology for more details. For the purposes of modeling, the
existing basin area will be modeled as till forest with moderate slope totaling 13.02 acres.
Predeveloped Vault Basin
Impervious Pervious Total
Area
0.00 Ac 13.02
Ac(1)
13.02
Ac
Notes:
1. Modeled as Forested Moderate slope
18396.003.TIR.doc
4.2 Developed Site Hydrology
When completed the Forest Terrace development will result in 25 new single-family homes. New
impervious surfaces will include roadways, sidewalks, driveways, and roof areas. The project will
be providing landscaped pervious areas, drainage facilities, and tree retention areas. The offsite
stormwater that drains onto the site will be routed around the site down Union Ave NE and will
connect back with the outfall catch basin. Due to the relative onsite elevations the stormwater will
be sent to detention system located onsite any runoff not tributary to the detention vault will be
treated via a mitigation trade or handled as bypass.
Stormwater generated by Road B, North ends of Lots 1-11 and parts of Tract A will be treated via
a Mitigated trade. Trade areas consists of existing impervious surface with Union Ave, the
Perkins Property and pervious surfaces upstream of the site that are not bypassed. All
impervious surfaces treated by the Mitigation Trade discharge via two level spreaders located
within Tract B and Lot 10. Additional runoff is directed through the outfall along Union Ave.
Please see Figure 4.2.1 Developed Drainage Basin Map contained within this section from more
details.
The remaining stormwater generated by the lots and remaining roads will be routed to a detention
vault located in Tract A. A conveyance system consisting of catch basins and storm pipes will be
constructed on the roadways to collect drainage from impervious areas and lots. All rooftop areas
are to be routed to the front of the lots and tight lined to the stormwater conveyance system. The
proposed detention vault has been sized to meet the Level 2 flow control duration standard
matching forest conditions to mitigate potential downstream erosion hazards for 50% of the 2
year to the Full 50-year flow. The developed peak discharge rates shall not exceed predeveloped
peak discharge rates for the 2-year and 10-year flow.
There is an upstream contributing basin located offsite south and west of the project. This area
flow onsite and generally collects into a drain in the eastern portion of the site. A catchbasin with
a birdcage grate is positioned to collect the runoff from this basin area and route it to the northern
border of the site. There the runoff is dispersed through a level spreader on the north side of Lot
10 to continue flowing down the hill mimicking existing condition.
Water quality will be provided for the entire site though a single StormFilter located downstream
of the detention vault. Please refer to section 4.5 for further detail regarding water quality
treatment details and sizing information.
This project will be implementing BMP's for individual lots and plat infrastructure improvements in
order to satisfy Core Requirement #9. This project has set a maximum impervious surface of
4,000 sf per lot. A restrictive covenant will be provided on the final plat. Individual lot bmps will
be evaluated at building permit stage and may result in a footprint less than 4,000 sf if other bmp
methods cannot be utilized.
Due to the poor infiltration capacity of onsite soils the proposed detention facilities were sized
assuming no treatment credit from these BMP's. As there is no treatment credit assigned to the
Individual lot BMP's, further discussion of the type of BMP and their implementation will be
addressed with the acquisition of the Building Permits.
The plat infrastructure BMP's will address runoff from roads and sidewalks within the Right-of-
Way. Due to the size of the proposed roads and sidewalk system, the relative elevation difference
onsite and the lack of viable undeveloped land, full dispersion was deemed not feasible for this
site. In addition, bioretention facilities, limited and full infiltration methods were also deemed
infeasible per the results of the geotechnical report, which is included in Section 6.1 of this TIR.
18396.003.TIR.doc
Additionally, basic dispersion will be evaluated on a lot-by-lot basin during building permit
process, along with all lots having perforated stub out connections when tight lined to the
proposed stormwater conveyance system and all disturbed soil will be amended to City of Renton
standards.
The upstream basin bypassing the site was modeled as follows:
Ustream Bypass
Impervious Pervious Total Area
0.50 Ac(1) 6.38 Ac(2) (3) 6.88 Ac
Notes:
1. Existing buildings and structures = 0.50 Ac
2. Modeled as till grass = 1.37 Ac
3. Modeled as Forested = 5.01 Ac
The basin areas that are tributary to the detention tank and detention vault are as follows:
Detention Vault
Impervious Pervious Total Area
4.66 Ac(1)(3)(4) 8.36 Ac(2)(3)(4)(5) 13.02 Ac
Notes:
1. Roads and Sidewalks = 2.00 Ac
Lot Area @ 4000 sf per lot = 2.30 Ac
Tract A = 0.02 Ac
2. Modeled as till grass = 5.75 Ac
Flat = 3.49 Ac
Mod = 2.26 Ac
3. Modeled as forested = 2.26 Ac
Mod = 2.26 Ac
4. Mitigation Trade
Modeled Impervious = 0.30 Ac
Modeled as Lawn = 0.9 AC
5. Bypass
Modeled Impervious = 0.04 Ac
Modeled as Lawn = 0.35 AC
For detention vault WWHM2012 design calculations please refer to section 4.4. For Water Quality
facility sizing information, please see section 4.5.
P
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLATPULTE GROUP, INC3535 FACTORIA BLVD S.E., #600BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000813/9/2020
FOREST TERRACE PLAT
18396.003.TIR.doc
4.3 Performance Standards
Within the property, the on-site soils are entirely till soils. A geotechnical analysis revealed that
the delineated basin is unsuitable for infiltration. Please refer to the Geotechnical Report for
Vandermay by Terra Associates, Inc. dated July 19, 2017. The WWHM2012 program was used
to size the detention facilities. The detention facilities was sized for Level 2 duration standard
matching forested site conditions for 50% of the 2 year to the Full 50-year flow. The developed
peak discharge rates shall not exceed predeveloped peak discharge rates for the 2-year and 10-
year flows, based on the requirements of the 2017 RSWDM. Please see the WWHM2012
calculations located in Section 4.4 (Flow Control System) of this report.
Per Core requirement #9 this project will be providing BMP’s for individual lots and on-site roads.
The proposed BMP's will not be used for any sizing or treatment credits for the detention or water
quality facilities proposed. The proposed detention and water quality facilities have been sized for
the full site.
This project is required to provide Basic Water Quality and will do so via a StormFilter designed
following the 2017 RSWDM. See Section 4.5 (Water Quality System) for more detail.
Core Requirement #9 – Onsite BMP Evaluation
Full Dispersion Not feasible for this site due to lot constrains
Full infiltration Not feasible for this site due to soil condition unsuitable for infiltration per
the results of the geotechnical report, which is included in Section 6.1 of
this TIR.
Limited Infiltration Not feasible for this site due to soil condition unsuitable for infiltration per
the results of the geotechnical report, which is included in Section 6.1 of
this TIR.
Basic Dispersion Basic dispersion will be utilized on a lot-by-lot basis. Further evaluation will
be done during the building permit submittal.
Farmland
Dispersion
Not applicable.
Bioretention Not feasible for this site due to soil condition unsuitable for infiltration per
the results of the geotechnical report, which is included in Section 6.1 of
this TIR.
Permeable
Pavement
Not feasible for this site due to soil condition unsuitable for infiltration per
the results of the geotechnical report, which is included in Section 6.1 of
this TIR.
Rainwater
Harvesting
Feasible but impractical, evaluated on an individual lot basis at developer’s
discretion.
Reduced
Impervious
Surface Credit
This project has set a maximum impervious surface of 4,000 sf per lot. A
restrictive covenant will be provided on the final plat. Individual lot bmps
will be evaluated at building permit stage and may result in a footprint less
than 4,000 sf if other bmp methods cannot be utilized.
Native Growth
Retention Credit
Not feasible due to site constrains
Perforated Pipe
Connection
All lots will provide perforated stub out connections when tight lined to the
proposed stormwater conveyance system.
Rain Gardens Not feasible for this site due to soil condition unsuitable for infiltration per
the results of the geotechnical report, included in Section 6.1 of this TIR
Soil Amendment All disturbed pervious surfaces shall be to the Soil Amendment standards.
Tree Retention
Credit
The project will be mass graded during construction clearing all trees
within the construction footprint. After clearing the site will contain
approximately 105 of the existing trees.
Vegetated Roofs All roofs are pitch roofs and are unsuitable for this BMP implication.
18396.003.TIR.doc
4.4 Flow Control System
The drainage facility within Tract A was designed to meet the Level 2 flow control duration
standard matching forest conditions to mitigate potential downstream erosion hazards for 50% of
the 2 year to the Full 50-year flow while not exceeding predeveloped peak discharge rates for the
2-year and 10-year storm event. WWHM2012 was used to size the detention facility. Please
refer to the WWHM2012 computations included within this section of the report. The required and
provided volumes for the Detention Vault are as follows:
Tract A - Detention Vault Volume
Required Provided
120,130 CF 123,130 CF
The control structure and riser within the Detention Vault have been sized to overtop the 100-year
unmitigated release rate of 7.43 CFS should the control structure's orifices become plugged or
fail.
Peak design flows for the predeveloped, developed and mitigated developed site area as follows:
Detention Vault - Design Flow Rates (CFS)
Peak Flows Predeveloped Developed Mitigated
Developed
2-year 0.53 2.94 0.35
10-year 1.21 4.74 0.73
100-year 2.40 7.43 1.51
P
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLATPULTE GROUP, INC3535 FACTORIA BLVD S.E., #600BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-000081FOREST TERRACE PLAT
SECTION 5.1 DETENTION FACILITIES
12/12/2016 2017 City of Renton Surface Water Design Manual 5-34
FIGURE 5.1.4.H RISER INFLOW CURVES
1
10
100
0.1 1 10HEAD IN FEET (measured from crest of riser)
Qweir=9.739 DH3/2
Qorifice=3.782 D2H1/2
Q in cfs, D and H in feet
Slope change occurs at weir-orifice transition Q (cubic feet per second)18
21
24
27
30
42
487254
10
12
15
33
36
RISER DIAMETER (inches)0.2 0.3 0.4
100- YR
7.42 CFS
0.5
WWHM2012
PROJECT REPORT
FOREST TERRACE - VAULT BASIN
DETENTION
18396-forest terrace 3/9/2020 12:29:20 PM Page 2
General Model Information
Project Name:18396-forest terrace
Site Name:
Site Address:
City:
Report Date:3/9/2020
Gage:Seatac
Data Start:1948/10/01
Data End:2009/09/30
Timestep:15 Minute
Precip Scale:0.000 (adjusted)
Version Date:2019/09/13
Version:4.2.17
POC Thresholds
Low Flow Threshold for POC1:50 Percent of the 2 Year
High Flow Threshold for POC1:50 Year
18396-forest terrace 3/9/2020 12:29:20 PM Page 3
Landuse Basin Data
Predeveloped Land Use
Basin 1
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Forest, Mod 13.02
Pervious Total 13.02
Impervious Land Use acre
Impervious Total 0
Basin Total 13.02
Element Flows To:
Surface Interflow Groundwater
FOREST TERRACE - VAULT BASIN - DETENTION
18396-forest terrace 3/9/2020 12:29:20 PM Page 4
Mitigated Land Use
Collected
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Lawn, Flat 4.86
Pervious Total 4.86
Impervious Land Use acre
ROADS FLAT 4.31
Impervious Total 4.31
Basin Total 9.17
Element Flows To:
Surface Interflow Groundwater
Vault 1 Vault 1
FOREST TERRACE - VAULT BASIN - DETENTION
18396-forest terrace 3/9/2020 12:29:20 PM Page 5
Pre-Existing TT
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Lawn, Flat 0.89
Pervious Total 0.89
Impervious Land Use acre
ROADS FLAT 0.31
Impervious Total 0.31
Basin Total 1.2
Element Flows To:
Surface Interflow Groundwater
Vault 1 Vault 1
FOREST TERRACE - VAULT BASIN - DETENTION
18396-forest terrace 3/9/2020 12:29:20 PM Page 6
Upstream
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Forest, Mod 2.26
Pervious Total 2.26
Impervious Land Use acre
Impervious Total 0
Basin Total 2.26
Element Flows To:
Surface Interflow Groundwater
Vault 1 Vault 1
FOREST TERRACE - VAULT BASIN - DETENTION
18396-forest terrace 3/9/2020 12:29:20 PM Page 7
bypass
Bypass:Yes
GroundWater:No
Pervious Land Use acre
C, Lawn, Flat 0.35
Pervious Total 0.35
Impervious Land Use acre
ROADS FLAT 0.04
Impervious Total 0.04
Basin Total 0.39
Element Flows To:
Surface Interflow Groundwater
FOREST TERRACE - VAULT BASIN - DETENTION
18396-forest terrace 3/9/2020 12:29:20 PM Page 8
Routing Elements
Predeveloped Routing
18396-forest terrace 3/9/2020 12:29:20 PM Page 9
Mitigated Routing
Vault 1
Width:104.5 ft.
Length:104.5 ft.
Depth:12 ft.
Discharge Structure
Riser Height:11 ft.
Riser Diameter:30 in.
Orifice 1 Diameter:2.031 in.Elevation:0 ft.
Orifice 2 Diameter:2.125 in.Elevation:6 ft.
Orifice 3 Diameter:2.313 in.Elevation:8.25 ft.
Element Flows To:
Outlet 1 Outlet 2
Vault Hydraulic Table
Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs)
0.0000 0.250 0.000 0.000 0.000
0.1333 0.250 0.033 0.040 0.000
0.2667 0.250 0.066 0.057 0.000
0.4000 0.250 0.100 0.070 0.000
0.5333 0.250 0.133 0.081 0.000
0.6667 0.250 0.167 0.091 0.000
0.8000 0.250 0.200 0.100 0.000
0.9333 0.250 0.234 0.108 0.000
1.0667 0.250 0.267 0.115 0.000
1.2000 0.250 0.300 0.122 0.000
1.3333 0.250 0.334 0.129 0.000
1.4667 0.250 0.367 0.135 0.000
1.6000 0.250 0.401 0.141 0.000
1.7333 0.250 0.434 0.147 0.000
1.8667 0.250 0.468 0.152 0.000
2.0000 0.250 0.501 0.158 0.000
2.1333 0.250 0.534 0.163 0.000
2.2667 0.250 0.568 0.168 0.000
2.4000 0.250 0.601 0.173 0.000
2.5333 0.250 0.635 0.178 0.000
2.6667 0.250 0.668 0.182 0.000
2.8000 0.250 0.701 0.187 0.000
2.9333 0.250 0.735 0.191 0.000
3.0667 0.250 0.768 0.196 0.000
3.2000 0.250 0.802 0.200 0.000
3.3333 0.250 0.835 0.204 0.000
3.4667 0.250 0.869 0.208 0.000
3.6000 0.250 0.902 0.212 0.000
3.7333 0.250 0.935 0.216 0.000
3.8667 0.250 0.969 0.220 0.000
4.0000 0.250 1.002 0.223 0.000
4.1333 0.250 1.036 0.227 0.000
4.2667 0.250 1.069 0.231 0.000
4.4000 0.250 1.103 0.234 0.000
4.5333 0.250 1.136 0.238 0.000
4.6667 0.250 1.169 0.241 0.000
4.8000 0.250 1.203 0.245 0.000
4.9333 0.250 1.236 0.248 0.000
FOREST TERRACE - VAULT BASIN - DETENTION
REQUIRED = 120,130 CF
(10,920 SF)
2-1/32"
2-1/8"
2-5/16"
18396-forest terrace 3/9/2020 12:29:20 PM Page 10
5.0667 0.250 1.270 0.252 0.000
5.2000 0.250 1.303 0.255 0.000
5.3333 0.250 1.337 0.258 0.000
5.4667 0.250 1.370 0.261 0.000
5.6000 0.250 1.403 0.264 0.000
5.7333 0.250 1.437 0.268 0.000
5.8667 0.250 1.470 0.271 0.000
6.0000 0.250 1.504 0.274 0.000
6.1333 0.250 1.537 0.322 0.000
6.2667 0.250 1.571 0.343 0.000
6.4000 0.250 1.604 0.360 0.000
6.5333 0.250 1.637 0.375 0.000
6.6667 0.250 1.671 0.389 0.000
6.8000 0.250 1.704 0.401 0.000
6.9333 0.250 1.738 0.413 0.000
7.0667 0.250 1.771 0.424 0.000
7.2000 0.250 1.805 0.434 0.000
7.3333 0.250 1.838 0.444 0.000
7.4667 0.250 1.871 0.454 0.000
7.6000 0.250 1.905 0.463 0.000
7.7333 0.250 1.938 0.472 0.000
7.8667 0.250 1.972 0.481 0.000
8.0000 0.250 2.005 0.489 0.000
8.1333 0.250 2.039 0.498 0.000
8.2667 0.250 2.072 0.525 0.000
8.4000 0.250 2.105 0.570 0.000
8.5333 0.250 2.139 0.599 0.000
8.6667 0.250 2.172 0.623 0.000
8.8000 0.250 2.206 0.644 0.000
8.9333 0.250 2.239 0.664 0.000
9.0667 0.250 2.273 0.682 0.000
9.2000 0.250 2.306 0.700 0.000
9.3333 0.250 2.339 0.716 0.000
9.4667 0.250 2.373 0.732 0.000
9.6000 0.250 2.406 0.748 0.000
9.7333 0.250 2.440 0.762 0.000
9.8667 0.250 2.473 0.777 0.000
10.000 0.250 2.506 0.791 0.000
10.133 0.250 2.540 0.804 0.000
10.267 0.250 2.573 0.818 0.000
10.400 0.250 2.607 0.830 0.000
10.533 0.250 2.640 0.843 0.000
10.667 0.250 2.674 0.856 0.000
10.800 0.250 2.707 0.868 0.000
10.933 0.250 2.740 0.880 0.000
11.067 0.250 2.774 1.348 0.000
11.200 0.250 2.807 3.267 0.000
11.333 0.250 2.841 5.951 0.000
11.467 0.250 2.874 9.080 0.000
11.600 0.250 2.908 12.36 0.000
11.733 0.250 2.941 15.50 0.000
11.867 0.250 2.974 18.22 0.000
12.000 0.250 3.008 20.33 0.000
12.133 0.250 3.041 21.82 0.000
12.267 0.000 0.000 23.14 0.000
18396-forest terrace 3/9/2020 12:29:20 PM Page 11
Analysis Results
POC 1
+ Predeveloped x Mitigated
Predeveloped Landuse Totals for POC #1
Total Pervious Area:13.02
Total Impervious Area:0
Mitigated Landuse Totals for POC #1
Total Pervious Area:8.36
Total Impervious Area:4.66
Flow Frequency Method:Log Pearson Type III 17B
Flow Frequency Return Periods for Predeveloped. POC #1
Return Period Flow(cfs)
2 year 0.536616
5 year 0.912042
10 year 1.210572
25 year 1.644673
50 year 2.009689
100 year 2.410765
Flow Frequency Return Periods for Mitigated. POC #1
Return Period Flow(cfs)
2 year 0.342099
5 year 0.526609
10 year 0.67878
25 year 0.9098
50 year 1.113127
100 year 1.345964
Annual Peaks
Annual Peaks for Predeveloped and Mitigated. POC #1
Year Predeveloped Mitigated
1949 0.782 0.273
1950 0.837 0.410
1951 1.053 0.853
1952 0.350 0.210
1953 0.295 0.251
1954 0.428 0.283
1955 0.659 0.301
1956 0.608 0.463
1957 0.534 0.279
1958 0.493 0.320
18396-forest terrace 3/9/2020 12:29:52 PM Page 12
1959 0.418 0.249
1960 0.841 0.734
1961 0.406 0.317
1962 0.275 0.191
1963 0.397 0.277
1964 0.548 0.257
1965 0.415 0.390
1966 0.329 0.251
1967 0.913 0.318
1968 0.505 0.256
1969 0.474 0.242
1970 0.381 0.244
1971 0.506 0.352
1972 0.825 0.526
1973 0.377 0.359
1974 0.498 0.358
1975 0.646 0.290
1976 0.469 0.293
1977 0.197 0.195
1978 0.382 0.317
1979 0.225 0.197
1980 1.465 0.666
1981 0.331 0.260
1982 0.856 0.582
1983 0.560 0.337
1984 0.343 0.236
1985 0.201 0.229
1986 0.852 0.480
1987 0.794 0.611
1988 0.336 0.232
1989 0.217 0.217
1990 2.479 0.834
1991 1.132 0.749
1992 0.445 0.354
1993 0.396 0.237
1994 0.170 0.189
1995 0.528 0.378
1996 1.396 0.864
1997 0.999 0.792
1998 0.387 0.259
1999 1.591 0.600
2000 0.378 0.283
2001 0.099 0.189
2002 0.533 0.481
2003 0.914 0.262
2004 0.859 0.825
2005 0.591 0.353
2006 0.581 0.356
2007 1.900 1.337
2008 1.930 0.905
2009 0.820 0.482
Ranked Annual Peaks
Ranked Annual Peaks for Predeveloped and Mitigated. POC #1
Rank Predeveloped Mitigated
1 2.4786 1.3370
2 1.9296 0.9049
3 1.8996 0.8643
18396-forest terrace 3/9/2020 12:29:52 PM Page 13
4 1.5914 0.8531
5 1.4653 0.8340
6 1.3964 0.8253
7 1.1320 0.7923
8 1.0529 0.7493
9 0.9989 0.7343
10 0.9140 0.6662
11 0.9134 0.6110
12 0.8590 0.5997
13 0.8562 0.5823
14 0.8522 0.5260
15 0.8407 0.4815
16 0.8365 0.4806
17 0.8251 0.4801
18 0.8198 0.4627
19 0.7939 0.4102
20 0.7816 0.3897
21 0.6595 0.3779
22 0.6457 0.3586
23 0.6081 0.3580
24 0.5905 0.3560
25 0.5806 0.3537
26 0.5604 0.3530
27 0.5477 0.3517
28 0.5343 0.3368
29 0.5328 0.3196
30 0.5281 0.3179
31 0.5064 0.3167
32 0.5047 0.3166
33 0.4983 0.3009
34 0.4925 0.2929
35 0.4745 0.2901
36 0.4694 0.2834
37 0.4453 0.2834
38 0.4275 0.2790
39 0.4184 0.2771
40 0.4147 0.2725
41 0.4056 0.2620
42 0.3970 0.2601
43 0.3958 0.2585
44 0.3874 0.2568
45 0.3818 0.2563
46 0.3812 0.2514
47 0.3778 0.2510
48 0.3771 0.2485
49 0.3500 0.2436
50 0.3427 0.2419
51 0.3358 0.2375
52 0.3314 0.2362
53 0.3291 0.2320
54 0.2952 0.2288
55 0.2752 0.2167
56 0.2252 0.2103
57 0.2168 0.1968
58 0.2006 0.1947
59 0.1970 0.1911
60 0.1699 0.1892
61 0.0985 0.1889
18396-forest terrace 3/9/2020 12:29:52 PM Page 14
18396-forest terrace 3/9/2020 12:29:52 PM Page 15
Duration Flows
The Facility PASSED
Flow(cfs)Predev Mit Percentage Pass/Fail
0.2683 16264 15680 96 Pass
0.2859 14217 9221 64 Pass
0.3035 12239 8147 66 Pass
0.3211 10515 7659 72 Pass
0.3387 9193 7182 78 Pass
0.3563 7974 6389 80 Pass
0.3738 7005 5754 82 Pass
0.3914 6154 5270 85 Pass
0.4090 5450 4842 88 Pass
0.4266 4875 4425 90 Pass
0.4442 4363 3848 88 Pass
0.4618 3938 3360 85 Pass
0.4794 3495 2870 82 Pass
0.4970 3106 2398 77 Pass
0.5146 2738 1946 71 Pass
0.5322 2419 1742 72 Pass
0.5497 2167 1613 74 Pass
0.5673 1935 1511 78 Pass
0.5849 1767 1452 82 Pass
0.6025 1601 1379 86 Pass
0.6201 1394 1299 93 Pass
0.6377 1250 1225 98 Pass
0.6553 1122 1125 100 Pass
0.6729 1037 1025 98 Pass
0.6905 944 912 96 Pass
0.7081 875 808 92 Pass
0.7256 791 702 88 Pass
0.7432 714 593 83 Pass
0.7608 634 515 81 Pass
0.7784 549 445 81 Pass
0.7960 466 382 81 Pass
0.8136 393 283 72 Pass
0.8312 351 213 60 Pass
0.8488 311 172 55 Pass
0.8664 266 114 42 Pass
0.8839 222 78 35 Pass
0.9015 184 48 26 Pass
0.9191 152 19 12 Pass
0.9367 128 18 14 Pass
0.9543 113 17 15 Pass
0.9719 94 17 18 Pass
0.9895 80 15 18 Pass
1.0071 67 15 22 Pass
1.0247 60 14 23 Pass
1.0423 49 13 26 Pass
1.0598 44 12 27 Pass
1.0774 41 12 29 Pass
1.0950 34 11 32 Pass
1.1126 31 11 35 Pass
1.1302 25 10 40 Pass
1.1478 20 9 45 Pass
1.1654 18 6 33 Pass
1.1830 12 6 50 Pass
18396-forest terrace 3/9/2020 12:29:52 PM Page 16
1.2006 12 5 41 Pass
1.2182 11 5 45 Pass
1.2357 11 5 45 Pass
1.2533 10 5 50 Pass
1.2709 9 4 44 Pass
1.2885 9 3 33 Pass
1.3061 9 3 33 Pass
1.3237 9 2 22 Pass
1.3413 9 0 0 Pass
1.3589 9 0 0 Pass
1.3765 9 0 0 Pass
1.3940 9 0 0 Pass
1.4116 8 0 0 Pass
1.4292 8 0 0 Pass
1.4468 8 0 0 Pass
1.4644 7 0 0 Pass
1.4820 6 0 0 Pass
1.4996 6 0 0 Pass
1.5172 6 0 0 Pass
1.5348 6 0 0 Pass
1.5524 6 0 0 Pass
1.5699 6 0 0 Pass
1.5875 6 0 0 Pass
1.6051 5 0 0 Pass
1.6227 5 0 0 Pass
1.6403 5 0 0 Pass
1.6579 5 0 0 Pass
1.6755 5 0 0 Pass
1.6931 5 0 0 Pass
1.7107 5 0 0 Pass
1.7283 5 0 0 Pass
1.7458 4 0 0 Pass
1.7634 4 0 0 Pass
1.7810 4 0 0 Pass
1.7986 4 0 0 Pass
1.8162 4 0 0 Pass
1.8338 4 0 0 Pass
1.8514 4 0 0 Pass
1.8690 4 0 0 Pass
1.8866 4 0 0 Pass
1.9042 3 0 0 Pass
1.9217 3 0 0 Pass
1.9393 1 0 0 Pass
1.9569 1 0 0 Pass
1.9745 1 0 0 Pass
1.9921 1 0 0 Pass
2.0097 1 0 0 Pass
18396-forest terrace 3/9/2020 12:29:52 PM Page 17
Water Quality
Water Quality BMP Flow and Volume for POC #1
On-line facility volume:1.0022 acre-feet
On-line facility target flow:0.9523 cfs.
Adjusted for 15 min:0.9523 cfs.
Off-line facility target flow:0.5267 cfs.
Adjusted for 15 min:0.5267 cfs.
18396-forest terrace 3/9/2020 12:29:52 PM Page 18
LID Report
18396-forest terrace 3/9/2020 12:30:02 PM Page 19
Model Default Modifications
Total of 0 changes have been made.
PERLND Changes
No PERLND changes have been made.
IMPLND Changes
No IMPLND changes have been made.
18396-forest terrace 3/9/2020 12:30:02 PM Page 20
Appendix
Predeveloped Schematic
18396-forest terrace 3/9/2020 12:30:02 PM Page 21
Mitigated Schematic
18396-forest terrace 3/9/2020 12:30:03 PM Page 22
Predeveloped UCI File
RUN
GLOBAL
WWHM4 model simulation
START 1948 10 01 END 2009 09 30
RUN INTERP OUTPUT LEVEL 3 0
RESUME 0 RUN 1 UNIT SYSTEM 1
END GLOBAL
FILES
<File> <Un#> <-----------File Name------------------------------>***
<-ID-> ***
WDM 26 18396-forest terrace.wdm
MESSU 25 Pre18396-forest terrace.MES
27 Pre18396-forest terrace.L61
28 Pre18396-forest terrace.L62
30 POC18396-forest terrace1.dat
END FILES
OPN SEQUENCE
INGRP INDELT 00:15
PERLND 11
COPY 501
DISPLY 1
END INGRP
END OPN SEQUENCE
DISPLY
DISPLY-INFO1
# - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND
1 Basin 1 MAX 1 2 30 9
END DISPLY-INFO1
END DISPLY
COPY
TIMESERIES
# - # NPT NMN ***
1 1 1
501 1 1
END TIMESERIES
END COPY
GENER
OPCODE
# # OPCD ***
END OPCODE
PARM
# # K ***
END PARM
END GENER
PERLND
GEN-INFO
<PLS ><-------Name------->NBLKS Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
11 C, Forest, Mod 1 1 1 1 27 0
END GEN-INFO
*** Section PWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ***
11 0 0 1 0 0 0 0 0 0 0 0 0
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ***************************** PIVL PYR
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *********
11 0 0 4 0 0 0 0 0 0 0 0 0 1 9
END PRINT-INFO
18396-forest terrace 3/9/2020 12:30:03 PM Page 23
PWAT-PARM1
<PLS > PWATER variable monthly parameter value flags ***
# - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT ***
11 0 0 0 0 0 0 0 0 0 0 0
END PWAT-PARM1
PWAT-PARM2
<PLS > PWATER input info: Part 2 ***
# - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC
11 0 4.5 0.08 400 0.1 0.5 0.996
END PWAT-PARM2
PWAT-PARM3
<PLS > PWATER input info: Part 3 ***
# - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP
11 0 0 2 2 0 0 0
END PWAT-PARM3
PWAT-PARM4
<PLS > PWATER input info: Part 4 ***
# - # CEPSC UZSN NSUR INTFW IRC LZETP ***
11 0.2 0.5 0.35 6 0.5 0.7
END PWAT-PARM4
PWAT-STATE1
<PLS > *** Initial conditions at start of simulation
ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 ***
# - # *** CEPS SURS UZS IFWS LZS AGWS GWVS
11 0 0 0 0 2.5 1 0
END PWAT-STATE1
END PERLND
IMPLND
GEN-INFO
<PLS ><-------Name-------> Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
END GEN-INFO
*** Section IWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW IWAT SLD IWG IQAL ***
END ACTIVITY
PRINT-INFO
<ILS > ******** Print-flags ******** PIVL PYR
# - # ATMP SNOW IWAT SLD IWG IQAL *********
END PRINT-INFO
IWAT-PARM1
<PLS > IWATER variable monthly parameter value flags ***
# - # CSNO RTOP VRS VNN RTLI ***
END IWAT-PARM1
IWAT-PARM2
<PLS > IWATER input info: Part 2 ***
# - # *** LSUR SLSUR NSUR RETSC
END IWAT-PARM2
IWAT-PARM3
<PLS > IWATER input info: Part 3 ***
# - # ***PETMAX PETMIN
END IWAT-PARM3
IWAT-STATE1
<PLS > *** Initial conditions at start of simulation
# - # *** RETS SURS
END IWAT-STATE1
18396-forest terrace 3/9/2020 12:30:03 PM Page 24
END IMPLND
SCHEMATIC
<-Source-> <--Area--> <-Target-> MBLK ***
<Name> # <-factor-> <Name> # Tbl# ***
Basin 1***
PERLND 11 13.02 COPY 501 12
PERLND 11 13.02 COPY 501 13
******Routing******
END SCHEMATIC
NETWORK
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
END NETWORK
RCHRES
GEN-INFO
RCHRES Name Nexits Unit Systems Printer ***
# - #<------------------><---> User T-series Engl Metr LKFG ***
in out ***
END GEN-INFO
*** Section RCHRES***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ***
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ******************* PIVL PYR
# - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR *********
END PRINT-INFO
HYDR-PARM1
RCHRES Flags for each HYDR Section ***
# - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each
FG FG FG FG possible exit *** possible exit possible exit
* * * * * * * * * * * * * * ***
END HYDR-PARM1
HYDR-PARM2
# - # FTABNO LEN DELTH STCOR KS DB50 ***
<------><--------><--------><--------><--------><--------><--------> ***
END HYDR-PARM2
HYDR-INIT
RCHRES Initial conditions for each HYDR section ***
# - # *** VOL Initial value of COLIND Initial value of OUTDGT
*** ac-ft for each possible exit for each possible exit
<------><--------> <---><---><---><---><---> *** <---><---><---><---><--->
END HYDR-INIT
END RCHRES
SPEC-ACTIONS
END SPEC-ACTIONS
FTABLES
END FTABLES
EXT SOURCES
<-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # ***
WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC
WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC
18396-forest terrace 3/9/2020 12:30:03 PM Page 25
WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP
WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP
END EXT SOURCES
EXT TARGETS
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ***
<Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg***
COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL
END EXT TARGETS
MASS-LINK
<Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->***
<Name> <Name> # #<-factor-> <Name> <Name> # #***
MASS-LINK 12
PERLND PWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 12
MASS-LINK 13
PERLND PWATER IFWO 0.083333 COPY INPUT MEAN
END MASS-LINK 13
END MASS-LINK
END RUN
18396-forest terrace 3/9/2020 12:30:03 PM Page 26
Mitigated UCI File
RUN
GLOBAL
WWHM4 model simulation
START 1948 10 01 END 2009 09 30
RUN INTERP OUTPUT LEVEL 3 0
RESUME 0 RUN 1 UNIT SYSTEM 1
END GLOBAL
FILES
<File> <Un#> <-----------File Name------------------------------>***
<-ID-> ***
WDM 26 18396-forest terrace.wdm
MESSU 25 Mit18396-forest terrace.MES
27 Mit18396-forest terrace.L61
28 Mit18396-forest terrace.L62
30 POC18396-forest terrace1.dat
END FILES
OPN SEQUENCE
INGRP INDELT 00:15
PERLND 16
IMPLND 1
PERLND 11
RCHRES 1
COPY 1
COPY 501
COPY 601
DISPLY 1
END INGRP
END OPN SEQUENCE
DISPLY
DISPLY-INFO1
# - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND
1 Vault 1 MAX 1 2 30 9
END DISPLY-INFO1
END DISPLY
COPY
TIMESERIES
# - # NPT NMN ***
1 1 1
501 1 1
601 1 1
END TIMESERIES
END COPY
GENER
OPCODE
# # OPCD ***
END OPCODE
PARM
# # K ***
END PARM
END GENER
PERLND
GEN-INFO
<PLS ><-------Name------->NBLKS Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
16 C, Lawn, Flat 1 1 1 1 27 0
11 C, Forest, Mod 1 1 1 1 27 0
END GEN-INFO
*** Section PWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ***
16 0 0 1 0 0 0 0 0 0 0 0 0
11 0 0 1 0 0 0 0 0 0 0 0 0
18396-forest terrace 3/9/2020 12:30:03 PM Page 27
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ***************************** PIVL PYR
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *********
16 0 0 4 0 0 0 0 0 0 0 0 0 1 9
11 0 0 4 0 0 0 0 0 0 0 0 0 1 9
END PRINT-INFO
PWAT-PARM1
<PLS > PWATER variable monthly parameter value flags ***
# - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT ***
16 0 0 0 0 0 0 0 0 0 0 0
11 0 0 0 0 0 0 0 0 0 0 0
END PWAT-PARM1
PWAT-PARM2
<PLS > PWATER input info: Part 2 ***
# - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC
16 0 4.5 0.03 400 0.05 0.5 0.996
11 0 4.5 0.08 400 0.1 0.5 0.996
END PWAT-PARM2
PWAT-PARM3
<PLS > PWATER input info: Part 3 ***
# - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP
16 0 0 2 2 0 0 0
11 0 0 2 2 0 0 0
END PWAT-PARM3
PWAT-PARM4
<PLS > PWATER input info: Part 4 ***
# - # CEPSC UZSN NSUR INTFW IRC LZETP ***
16 0.1 0.25 0.25 6 0.5 0.25
11 0.2 0.5 0.35 6 0.5 0.7
END PWAT-PARM4
PWAT-STATE1
<PLS > *** Initial conditions at start of simulation
ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 ***
# - # *** CEPS SURS UZS IFWS LZS AGWS GWVS
16 0 0 0 0 2.5 1 0
11 0 0 0 0 2.5 1 0
END PWAT-STATE1
END PERLND
IMPLND
GEN-INFO
<PLS ><-------Name-------> Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
1 ROADS/FLAT 1 1 1 27 0
END GEN-INFO
*** Section IWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW IWAT SLD IWG IQAL ***
1 0 0 1 0 0 0
END ACTIVITY
PRINT-INFO
<ILS > ******** Print-flags ******** PIVL PYR
# - # ATMP SNOW IWAT SLD IWG IQAL *********
1 0 0 4 0 0 0 1 9
END PRINT-INFO
IWAT-PARM1
<PLS > IWATER variable monthly parameter value flags ***
# - # CSNO RTOP VRS VNN RTLI ***
18396-forest terrace 3/9/2020 12:30:03 PM Page 28
1 0 0 0 0 0
END IWAT-PARM1
IWAT-PARM2
<PLS > IWATER input info: Part 2 ***
# - # *** LSUR SLSUR NSUR RETSC
1 400 0.01 0.1 0.1
END IWAT-PARM2
IWAT-PARM3
<PLS > IWATER input info: Part 3 ***
# - # ***PETMAX PETMIN
1 0 0
END IWAT-PARM3
IWAT-STATE1
<PLS > *** Initial conditions at start of simulation
# - # *** RETS SURS
1 0 0
END IWAT-STATE1
END IMPLND
SCHEMATIC
<-Source-> <--Area--> <-Target-> MBLK ***
<Name> # <-factor-> <Name> # Tbl# ***
Collected***
PERLND 16 4.86 RCHRES 1 2
PERLND 16 4.86 RCHRES 1 3
IMPLND 1 4.31 RCHRES 1 5
Pre-Existing TT***
PERLND 16 0.89 RCHRES 1 2
PERLND 16 0.89 RCHRES 1 3
IMPLND 1 0.31 RCHRES 1 5
Upstream***
PERLND 11 2.26 RCHRES 1 2
PERLND 11 2.26 RCHRES 1 3
bypass***
PERLND 16 0.35 COPY 501 12
PERLND 16 0.35 COPY 601 12
PERLND 16 0.35 COPY 501 13
PERLND 16 0.35 COPY 601 13
IMPLND 1 0.04 COPY 501 15
IMPLND 1 0.04 COPY 601 15
******Routing******
PERLND 16 4.86 COPY 1 12
IMPLND 1 4.31 COPY 1 15
PERLND 16 4.86 COPY 1 13
PERLND 16 0.89 COPY 1 12
IMPLND 1 0.31 COPY 1 15
PERLND 16 0.89 COPY 1 13
PERLND 11 2.26 COPY 1 12
PERLND 11 2.26 COPY 1 13
RCHRES 1 1 COPY 501 16
END SCHEMATIC
NETWORK
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
END NETWORK
RCHRES
GEN-INFO
18396-forest terrace 3/9/2020 12:30:03 PM Page 29
RCHRES Name Nexits Unit Systems Printer ***
# - #<------------------><---> User T-series Engl Metr LKFG ***
in out ***
1 Vault 1 1 1 1 1 28 0 1
END GEN-INFO
*** Section RCHRES***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ***
1 1 0 0 0 0 0 0 0 0 0
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ******************* PIVL PYR
# - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR *********
1 4 0 0 0 0 0 0 0 0 0 1 9
END PRINT-INFO
HYDR-PARM1
RCHRES Flags for each HYDR Section ***
# - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each
FG FG FG FG possible exit *** possible exit possible exit
* * * * * * * * * * * * * * ***
1 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2
END HYDR-PARM1
HYDR-PARM2
# - # FTABNO LEN DELTH STCOR KS DB50 ***
<------><--------><--------><--------><--------><--------><--------> ***
1 1 0.02 0.0 0.0 0.5 0.0
END HYDR-PARM2
HYDR-INIT
RCHRES Initial conditions for each HYDR section ***
# - # *** VOL Initial value of COLIND Initial value of OUTDGT
*** ac-ft for each possible exit for each possible exit
<------><--------> <---><---><---><---><---> *** <---><---><---><---><--->
1 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
END HYDR-INIT
END RCHRES
SPEC-ACTIONS
END SPEC-ACTIONS
FTABLES
FTABLE 1
92 4
Depth Area Volume Outflow1 Velocity Travel Time***
(ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)***
0.000000 0.250694 0.000000 0.000000
0.133333 0.250694 0.033426 0.040874
0.266667 0.250694 0.066852 0.057805
0.400000 0.250694 0.100278 0.070796
0.533333 0.250694 0.133704 0.081748
0.666667 0.250694 0.167130 0.091397
0.800000 0.250694 0.200556 0.100121
0.933333 0.250694 0.233981 0.108143
1.066667 0.250694 0.267407 0.115609
1.200000 0.250694 0.300833 0.122622
1.333333 0.250694 0.334259 0.129255
1.466667 0.250694 0.367685 0.135564
1.600000 0.250694 0.401111 0.141592
1.733333 0.250694 0.434537 0.147374
1.866667 0.250694 0.467963 0.152937
2.000000 0.250694 0.501389 0.158305
2.133333 0.250694 0.534815 0.163496
2.266667 0.250694 0.568241 0.168528
2.400000 0.250694 0.601667 0.173414
2.533333 0.250694 0.635093 0.178166
2.666667 0.250694 0.668519 0.182794
2.800000 0.250694 0.701944 0.187309
18396-forest terrace 3/9/2020 12:30:03 PM Page 30
2.933333 0.250694 0.735370 0.191716
3.066667 0.250694 0.768796 0.196025
3.200000 0.250694 0.802222 0.200241
3.333333 0.250694 0.835648 0.204370
3.466667 0.250694 0.869074 0.208418
3.600000 0.250694 0.902500 0.212388
3.733333 0.250694 0.935926 0.216285
3.866667 0.250694 0.969352 0.220114
4.000000 0.250694 1.002778 0.223877
4.133333 0.250694 1.036204 0.227577
4.266667 0.250694 1.069630 0.231219
4.400000 0.250694 1.103056 0.234804
4.533333 0.250694 1.136481 0.238335
4.666667 0.250694 1.169907 0.241814
4.800000 0.250694 1.203333 0.245244
4.933333 0.250694 1.236759 0.248627
5.066667 0.250694 1.270185 0.251965
5.200000 0.250694 1.303611 0.255259
5.333333 0.250694 1.337037 0.258510
5.466667 0.250694 1.370463 0.261722
5.600000 0.250694 1.403889 0.264894
5.733333 0.250694 1.437315 0.268029
5.866667 0.250694 1.470741 0.271128
6.000000 0.250694 1.504167 0.274192
6.133333 0.250694 1.537593 0.321967
6.266667 0.250694 1.571019 0.343498
6.400000 0.250694 1.604444 0.360685
6.533333 0.250694 1.637870 0.375609
6.666667 0.250694 1.671296 0.389077
6.800000 0.250694 1.704722 0.401502
6.933333 0.250694 1.738148 0.413132
7.066667 0.250694 1.771574 0.424126
7.200000 0.250694 1.805000 0.434597
7.333333 0.250694 1.838426 0.444627
7.466667 0.250694 1.871852 0.454276
7.600000 0.250694 1.905278 0.463594
7.733333 0.250694 1.938704 0.472619
7.866667 0.250694 1.972130 0.481381
8.000000 0.250694 2.005556 0.489906
8.133333 0.250694 2.038981 0.498217
8.266667 0.250694 2.072407 0.525075
8.400000 0.250694 2.105833 0.570494
8.533333 0.250694 2.139259 0.599311
8.666667 0.250694 2.172685 0.623358
8.800000 0.250694 2.206111 0.644780
8.933333 0.250694 2.239537 0.664455
9.066667 0.250694 2.272963 0.682846
9.200000 0.250694 2.306389 0.700236
9.333333 0.250694 2.339815 0.716812
9.466667 0.250694 2.373241 0.732706
9.600000 0.250694 2.406667 0.748016
9.733333 0.250694 2.440093 0.762817
9.866667 0.250694 2.473519 0.777167
10.00000 0.250694 2.506944 0.791116
10.13333 0.250694 2.540370 0.804701
10.26667 0.250694 2.573796 0.817956
10.40000 0.250694 2.607222 0.830909
10.53333 0.250694 2.640648 0.843582
10.66667 0.250694 2.674074 0.855998
10.80000 0.250694 2.707500 0.868173
10.93333 0.250694 2.740926 0.880124
11.06667 0.250694 2.774352 1.348350
11.20000 0.250694 2.807778 3.267935
11.33333 0.250694 2.841204 5.951306
11.46667 0.250694 2.874630 9.080549
11.60000 0.250694 2.908056 12.36290
11.73333 0.250694 2.941481 15.50012
11.86667 0.250694 2.974907 18.22094
12.00000 0.250694 3.008333 20.33836
12.13333 0.250694 3.041759 21.82276
18396-forest terrace 3/9/2020 12:30:03 PM Page 31
END FTABLE 1
END FTABLES
EXT SOURCES
<-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # ***
WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC
WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC
WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP
WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP
END EXT SOURCES
EXT TARGETS
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ***
<Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg***
RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL
RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL
COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL
COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL
COPY 601 OUTPUT MEAN 1 1 48.4 WDM 901 FLOW ENGL REPL
END EXT TARGETS
MASS-LINK
<Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->***
<Name> <Name> # #<-factor-> <Name> <Name> # #***
MASS-LINK 2
PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL
END MASS-LINK 2
MASS-LINK 3
PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL
END MASS-LINK 3
MASS-LINK 5
IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL
END MASS-LINK 5
MASS-LINK 12
PERLND PWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 12
MASS-LINK 13
PERLND PWATER IFWO 0.083333 COPY INPUT MEAN
END MASS-LINK 13
MASS-LINK 15
IMPLND IWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 15
MASS-LINK 16
RCHRES ROFLOW COPY INPUT MEAN
END MASS-LINK 16
END MASS-LINK
END RUN
18396-forest terrace 3/9/2020 12:30:03 PM Page 32
Predeveloped HSPF Message File
18396-forest terrace 3/9/2020 12:30:03 PM Page 33
Mitigated HSPF Message File
18396-forest terrace 3/9/2020 12:30:03 PM Page 34
Disclaimer
Legal Notice
This program and accompanying documentation are provided 'as-is' without warranty of any kind. The
entire risk regarding the performance and results of this program is assumed by End User. Clear
Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either
expressed or implied, including but not limited to implied warranties of program and accompanying
documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever
(including without limitation to damages for loss of business profits, loss of business information,
business interruption, and the like) arising out of the use of, or inability to use this program even
if Clear Creek Solutions Inc. or their authorized representatives have been advised of the
possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2020; All
Rights Reserved.
Clear Creek Solutions, Inc.
6200 Capitol Blvd. Ste F
Olympia, WA. 98501
Toll Free 1(866)943-0304
Local (360)943-0304
www.clearcreeksolutions.com
WWHM2012
PROJECT REPORT
FOREST TERRACE - UPSTREAM
BYPASS
18396-forest terrace-bypass 10/18/2018 1:55:25 PM Page 2
General Model Information
Project Name:18396-forest terrace-bypass
Site Name:
Site Address:
City:
Report Date:10/18/2018
Gage:Seatac
Data Start:1948/10/01
Data End:2009/09/30
Timestep:15 Minute
Precip Scale:0.000 (adjusted)
Version Date:2018/03/02
Version:4.2.14
POC Thresholds
Low Flow Threshold for POC1:50 Percent of the 2 Year
High Flow Threshold for POC1:50 Year
18396-forest terrace-bypass 10/18/2018 1:55:25 PM Page 3
Landuse Basin Data
Predeveloped Land Use
Basin 1
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Forest, Flat 4.42
C, Forest, Mod 0.81
C, Lawn, Flat 1.14
Pervious Total 6.37
Impervious Land Use acre
ROADS FLAT 0.5
Impervious Total 0.5
Basin Total 6.87
Element Flows To:
Surface Interflow Groundwater
FOREST TERRACE - UPSTREAM BYPASS
18396-forest terrace-bypass 10/18/2018 1:55:25 PM Page 4
Mitigated Land Use
Basin 1
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Forest, Flat 4.42
C, Lawn, Flat 1.14
C, Forest, Mod 0.81
Pervious Total 6.37
Impervious Land Use acre
ROADS FLAT 0.5
Impervious Total 0.5
Basin Total 6.87
Element Flows To:
Surface Interflow Groundwater
FOREST TERRACE - UPSTREAM BYPASS
18396-forest terrace-bypass 10/18/2018 1:55:25 PM Page 5
Routing Elements
Predeveloped Routing
18396-forest terrace-bypass 10/18/2018 1:55:25 PM Page 6
Mitigated Routing
18396-forest terrace-bypass 10/18/2018 1:55:25 PM Page 7
Analysis Results
POC 1
+ Predeveloped x Mitigated
Predeveloped Landuse Totals for POC #1
Total Pervious Area:6.37
Total Impervious Area:0.5
Mitigated Landuse Totals for POC #1
Total Pervious Area:6.37
Total Impervious Area:0.5
Flow Frequency Method:Log Pearson Type III 17B
Flow Frequency Return Periods for Predeveloped. POC #1
Return Period Flow(cfs)
2 year 0.522051
5 year 0.787178
10 year 0.989016
25 year 1.274874
50 year 1.510875
100 year 1.767217
Flow Frequency Return Periods for Mitigated. POC #1
Return Period Flow(cfs)
2 year 0.522051
5 year 0.787178
10 year 0.989016
25 year 1.274874
50 year 1.510875
100 year 1.767217
Annual Peaks
Annual Peaks for Predeveloped and Mitigated. POC #1
Year Predeveloped Mitigated
1949 0.829 0.829
1950 0.800 0.800
1951 0.649 0.649
1952 0.339 0.339
1953 0.269 0.269
1954 0.425 0.425
1955 0.489 0.489
1956 0.472 0.472
1957 0.614 0.614
1958 0.352 0.352
18396-forest terrace-bypass 10/18/2018 1:55:59 PM Page 8
1959 0.329 0.329
1960 0.676 0.676
1961 0.480 0.480
1962 0.237 0.237
1963 0.467 0.467
1964 0.455 0.455
1965 0.562 0.562
1966 0.357 0.357
1967 0.823 0.823
1968 0.522 0.522
1969 0.494 0.494
1970 0.487 0.487
1971 0.577 0.577
1972 0.753 0.753
1973 0.313 0.313
1974 0.538 0.538
1975 0.665 0.665
1976 0.474 0.474
1977 0.369 0.369
1978 0.422 0.422
1979 0.395 0.395
1980 1.080 1.080
1981 0.473 0.473
1982 0.963 0.963
1983 0.425 0.425
1984 0.349 0.349
1985 0.385 0.385
1986 0.624 0.624
1987 0.621 0.621
1988 0.255 0.255
1989 0.261 0.261
1990 1.870 1.870
1991 1.132 1.132
1992 0.418 0.418
1993 0.301 0.301
1994 0.195 0.195
1995 0.413 0.413
1996 0.963 0.963
1997 0.670 0.670
1998 0.452 0.452
1999 1.269 1.269
2000 0.496 0.496
2001 0.326 0.326
2002 0.730 0.730
2003 0.749 0.749
2004 0.898 0.898
2005 0.554 0.554
2006 0.528 0.528
2007 1.557 1.557
2008 1.243 1.243
2009 0.747 0.747
Ranked Annual Peaks
Ranked Annual Peaks for Predeveloped and Mitigated. POC #1
Rank Predeveloped Mitigated
1 1.8700 1.8700
2 1.5571 1.5571
3 1.2687 1.2687
18396-forest terrace-bypass 10/18/2018 1:55:59 PM Page 9
4 1.2433 1.2433
5 1.1323 1.1323
6 1.0796 1.0796
7 0.9633 0.9633
8 0.9626 0.9626
9 0.8983 0.8983
10 0.8291 0.8291
11 0.8233 0.8233
12 0.7999 0.7999
13 0.7528 0.7528
14 0.7490 0.7490
15 0.7468 0.7468
16 0.7303 0.7303
17 0.6765 0.6765
18 0.6699 0.6699
19 0.6654 0.6654
20 0.6485 0.6485
21 0.6238 0.6238
22 0.6206 0.6206
23 0.6141 0.6141
24 0.5771 0.5771
25 0.5616 0.5616
26 0.5538 0.5538
27 0.5378 0.5378
28 0.5277 0.5277
29 0.5217 0.5217
30 0.4964 0.4964
31 0.4938 0.4938
32 0.4887 0.4887
33 0.4866 0.4866
34 0.4798 0.4798
35 0.4738 0.4738
36 0.4733 0.4733
37 0.4724 0.4724
38 0.4673 0.4673
39 0.4549 0.4549
40 0.4515 0.4515
41 0.4250 0.4250
42 0.4248 0.4248
43 0.4215 0.4215
44 0.4176 0.4176
45 0.4126 0.4126
46 0.3950 0.3950
47 0.3852 0.3852
48 0.3687 0.3687
49 0.3567 0.3567
50 0.3525 0.3525
51 0.3490 0.3490
52 0.3390 0.3390
53 0.3286 0.3286
54 0.3265 0.3265
55 0.3130 0.3130
56 0.3007 0.3007
57 0.2693 0.2693
58 0.2612 0.2612
59 0.2545 0.2545
60 0.2370 0.2370
61 0.1951 0.1951
18396-forest terrace-bypass 10/18/2018 1:55:59 PM Page 10
18396-forest terrace-bypass 10/18/2018 1:55:59 PM Page 11
Duration Flows
The Facility PASSED
Flow(cfs)Predev Mit Percentage Pass/Fail
0.2610 4695 4695 100 Pass
0.2737 4122 4122 100 Pass
0.2863 3578 3578 100 Pass
0.2989 3138 3138 100 Pass
0.3115 2712 2712 100 Pass
0.3241 2357 2357 100 Pass
0.3368 2094 2094 100 Pass
0.3494 1853 1853 100 Pass
0.3620 1614 1614 100 Pass
0.3746 1443 1443 100 Pass
0.3873 1273 1273 100 Pass
0.3999 1146 1146 100 Pass
0.4125 1011 1011 100 Pass
0.4251 886 886 100 Pass
0.4378 790 790 100 Pass
0.4504 688 688 100 Pass
0.4630 604 604 100 Pass
0.4756 524 524 100 Pass
0.4883 450 450 100 Pass
0.5009 392 392 100 Pass
0.5135 348 348 100 Pass
0.5261 303 303 100 Pass
0.5388 277 277 100 Pass
0.5514 249 249 100 Pass
0.5640 227 227 100 Pass
0.5766 204 204 100 Pass
0.5893 181 181 100 Pass
0.6019 166 166 100 Pass
0.6145 146 146 100 Pass
0.6271 131 131 100 Pass
0.6398 120 120 100 Pass
0.6524 107 107 100 Pass
0.6650 99 99 100 Pass
0.6776 91 91 100 Pass
0.6903 87 87 100 Pass
0.7029 78 78 100 Pass
0.7155 74 74 100 Pass
0.7281 71 71 100 Pass
0.7408 65 65 100 Pass
0.7534 58 58 100 Pass
0.7660 54 54 100 Pass
0.7786 49 49 100 Pass
0.7913 48 48 100 Pass
0.8039 44 44 100 Pass
0.8165 39 39 100 Pass
0.8291 35 35 100 Pass
0.8418 32 32 100 Pass
0.8544 29 29 100 Pass
0.8670 26 26 100 Pass
0.8796 24 24 100 Pass
0.8923 22 22 100 Pass
0.9049 19 19 100 Pass
0.9175 19 19 100 Pass
18396-forest terrace-bypass 10/18/2018 1:55:59 PM Page 12
0.9301 19 19 100 Pass
0.9428 19 19 100 Pass
0.9554 18 18 100 Pass
0.9680 15 15 100 Pass
0.9806 13 13 100 Pass
0.9933 13 13 100 Pass
1.0059 13 13 100 Pass
1.0185 12 12 100 Pass
1.0311 12 12 100 Pass
1.0438 12 12 100 Pass
1.0564 12 12 100 Pass
1.0690 12 12 100 Pass
1.0816 10 10 100 Pass
1.0943 10 10 100 Pass
1.1069 9 9 100 Pass
1.1195 9 9 100 Pass
1.1321 9 9 100 Pass
1.1448 7 7 100 Pass
1.1574 7 7 100 Pass
1.1700 7 7 100 Pass
1.1826 6 6 100 Pass
1.1953 6 6 100 Pass
1.2079 6 6 100 Pass
1.2205 6 6 100 Pass
1.2331 6 6 100 Pass
1.2458 5 5 100 Pass
1.2584 5 5 100 Pass
1.2710 4 4 100 Pass
1.2836 4 4 100 Pass
1.2963 4 4 100 Pass
1.3089 4 4 100 Pass
1.3215 3 3 100 Pass
1.3341 2 2 100 Pass
1.3468 2 2 100 Pass
1.3594 2 2 100 Pass
1.3720 2 2 100 Pass
1.3846 2 2 100 Pass
1.3973 2 2 100 Pass
1.4099 2 2 100 Pass
1.4225 2 2 100 Pass
1.4351 2 2 100 Pass
1.4478 2 2 100 Pass
1.4604 2 2 100 Pass
1.4730 2 2 100 Pass
1.4856 2 2 100 Pass
1.4983 2 2 100 Pass
1.5109 2 2 100 Pass
18396-forest terrace-bypass 10/18/2018 1:55:59 PM Page 13
Water Quality
Water Quality BMP Flow and Volume for POC #1
On-line facility volume:1.1584 acre-feet
On-line facility target flow:1.1226 cfs.
Adjusted for 15 min:1.1226 cfs.
Off-line facility target flow:0.6206 cfs.
Adjusted for 15 min:0.6206 cfs.
18396-forest terrace-bypass 10/18/2018 1:55:59 PM Page 14
LID Report
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 15
POC 2
POC #2 was not reported because POC must exist in both scenarios and both scenarios
must have been run.
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 16
Model Default Modifications
Total of 0 changes have been made.
PERLND Changes
No PERLND changes have been made.
IMPLND Changes
No IMPLND changes have been made.
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 17
Appendix
Predeveloped Schematic
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 18
Mitigated Schematic
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 19
Predeveloped UCI File
RUN
GLOBAL
WWHM4 model simulation
START 1948 10 01 END 2009 09 30
RUN INTERP OUTPUT LEVEL 3 0
RESUME 0 RUN 1 UNIT SYSTEM 1
END GLOBAL
FILES
<File> <Un#> <-----------File Name------------------------------>***
<-ID-> ***
WDM 26 18396-forest terrace-bypass.wdm
MESSU 25 Pre18396-forest terrace-bypass.MES
27 Pre18396-forest terrace-bypass.L61
28 Pre18396-forest terrace-bypass.L62
30 POC18396-forest terrace-bypass1.dat
END FILES
OPN SEQUENCE
INGRP INDELT 00:15
PERLND 10
PERLND 11
PERLND 16
IMPLND 1
COPY 501
DISPLY 1
END INGRP
END OPN SEQUENCE
DISPLY
DISPLY-INFO1
# - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND
1 Basin 1 MAX 1 2 30 9
END DISPLY-INFO1
END DISPLY
COPY
TIMESERIES
# - # NPT NMN ***
1 1 1
501 1 1
END TIMESERIES
END COPY
GENER
OPCODE
# # OPCD ***
END OPCODE
PARM
# # K ***
END PARM
END GENER
PERLND
GEN-INFO
<PLS ><-------Name------->NBLKS Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
10 C, Forest, Flat 1 1 1 1 27 0
11 C, Forest, Mod 1 1 1 1 27 0
16 C, Lawn, Flat 1 1 1 1 27 0
END GEN-INFO
*** Section PWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ***
10 0 0 1 0 0 0 0 0 0 0 0 0
11 0 0 1 0 0 0 0 0 0 0 0 0
16 0 0 1 0 0 0 0 0 0 0 0 0
END ACTIVITY
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 20
PRINT-INFO
<PLS > ***************** Print-flags ***************************** PIVL PYR
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *********
10 0 0 4 0 0 0 0 0 0 0 0 0 1 9
11 0 0 4 0 0 0 0 0 0 0 0 0 1 9
16 0 0 4 0 0 0 0 0 0 0 0 0 1 9
END PRINT-INFO
PWAT-PARM1
<PLS > PWATER variable monthly parameter value flags ***
# - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT ***
10 0 0 0 0 0 0 0 0 0 0 0
11 0 0 0 0 0 0 0 0 0 0 0
16 0 0 0 0 0 0 0 0 0 0 0
END PWAT-PARM1
PWAT-PARM2
<PLS > PWATER input info: Part 2 ***
# - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC
10 0 4.5 0.08 400 0.05 0.5 0.996
11 0 4.5 0.08 400 0.1 0.5 0.996
16 0 4.5 0.03 400 0.05 0.5 0.996
END PWAT-PARM2
PWAT-PARM3
<PLS > PWATER input info: Part 3 ***
# - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP
10 0 0 2 2 0 0 0
11 0 0 2 2 0 0 0
16 0 0 2 2 0 0 0
END PWAT-PARM3
PWAT-PARM4
<PLS > PWATER input info: Part 4 ***
# - # CEPSC UZSN NSUR INTFW IRC LZETP ***
10 0.2 0.5 0.35 6 0.5 0.7
11 0.2 0.5 0.35 6 0.5 0.7
16 0.1 0.25 0.25 6 0.5 0.25
END PWAT-PARM4
PWAT-STATE1
<PLS > *** Initial conditions at start of simulation
ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 ***
# - # *** CEPS SURS UZS IFWS LZS AGWS GWVS
10 0 0 0 0 2.5 1 0
11 0 0 0 0 2.5 1 0
16 0 0 0 0 2.5 1 0
END PWAT-STATE1
END PERLND
IMPLND
GEN-INFO
<PLS ><-------Name-------> Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
1 ROADS/FLAT 1 1 1 27 0
END GEN-INFO
*** Section IWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW IWAT SLD IWG IQAL ***
1 0 0 1 0 0 0
END ACTIVITY
PRINT-INFO
<ILS > ******** Print-flags ******** PIVL PYR
# - # ATMP SNOW IWAT SLD IWG IQAL *********
1 0 0 4 0 0 0 1 9
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 21
END PRINT-INFO
IWAT-PARM1
<PLS > IWATER variable monthly parameter value flags ***
# - # CSNO RTOP VRS VNN RTLI ***
1 0 0 0 0 0
END IWAT-PARM1
IWAT-PARM2
<PLS > IWATER input info: Part 2 ***
# - # *** LSUR SLSUR NSUR RETSC
1 400 0.01 0.1 0.1
END IWAT-PARM2
IWAT-PARM3
<PLS > IWATER input info: Part 3 ***
# - # ***PETMAX PETMIN
1 0 0
END IWAT-PARM3
IWAT-STATE1
<PLS > *** Initial conditions at start of simulation
# - # *** RETS SURS
1 0 0
END IWAT-STATE1
END IMPLND
SCHEMATIC
<-Source-> <--Area--> <-Target-> MBLK ***
<Name> # <-factor-> <Name> # Tbl# ***
Basin 1***
PERLND 10 4.42 COPY 501 12
PERLND 10 4.42 COPY 501 13
PERLND 11 0.81 COPY 501 12
PERLND 11 0.81 COPY 501 13
PERLND 16 1.14 COPY 501 12
PERLND 16 1.14 COPY 501 13
IMPLND 1 0.5 COPY 501 15
******Routing******
END SCHEMATIC
NETWORK
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
END NETWORK
RCHRES
GEN-INFO
RCHRES Name Nexits Unit Systems Printer ***
# - #<------------------><---> User T-series Engl Metr LKFG ***
in out ***
END GEN-INFO
*** Section RCHRES***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ***
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ******************* PIVL PYR
# - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR *********
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 22
END PRINT-INFO
HYDR-PARM1
RCHRES Flags for each HYDR Section ***
# - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each
FG FG FG FG possible exit *** possible exit possible exit
* * * * * * * * * * * * * * ***
END HYDR-PARM1
HYDR-PARM2
# - # FTABNO LEN DELTH STCOR KS DB50 ***
<------><--------><--------><--------><--------><--------><--------> ***
END HYDR-PARM2
HYDR-INIT
RCHRES Initial conditions for each HYDR section ***
# - # *** VOL Initial value of COLIND Initial value of OUTDGT
*** ac-ft for each possible exit for each possible exit
<------><--------> <---><---><---><---><---> *** <---><---><---><---><--->
END HYDR-INIT
END RCHRES
SPEC-ACTIONS
END SPEC-ACTIONS
FTABLES
END FTABLES
EXT SOURCES
<-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # ***
WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC
WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC
WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP
WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP
END EXT SOURCES
EXT TARGETS
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ***
<Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg***
COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL
END EXT TARGETS
MASS-LINK
<Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->***
<Name> <Name> # #<-factor-> <Name> <Name> # #***
MASS-LINK 12
PERLND PWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 12
MASS-LINK 13
PERLND PWATER IFWO 0.083333 COPY INPUT MEAN
END MASS-LINK 13
MASS-LINK 15
IMPLND IWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 15
END MASS-LINK
END RUN
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 23
Mitigated UCI File
RUN
GLOBAL
WWHM4 model simulation
START 1948 10 01 END 2009 09 30
RUN INTERP OUTPUT LEVEL 3 0
RESUME 0 RUN 1 UNIT SYSTEM 1
END GLOBAL
FILES
<File> <Un#> <-----------File Name------------------------------>***
<-ID-> ***
WDM 26 18396-forest terrace-bypass.wdm
MESSU 25 Mit18396-forest terrace-bypass.MES
27 Mit18396-forest terrace-bypass.L61
28 Mit18396-forest terrace-bypass.L62
30 POC18396-forest terrace-bypass1.dat
END FILES
OPN SEQUENCE
INGRP INDELT 00:15
PERLND 10
PERLND 16
PERLND 11
IMPLND 1
COPY 501
DISPLY 1
END INGRP
END OPN SEQUENCE
DISPLY
DISPLY-INFO1
# - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND
1 Basin 1 MAX 1 2 30 9
END DISPLY-INFO1
END DISPLY
COPY
TIMESERIES
# - # NPT NMN ***
1 1 1
501 1 1
END TIMESERIES
END COPY
GENER
OPCODE
# # OPCD ***
END OPCODE
PARM
# # K ***
END PARM
END GENER
PERLND
GEN-INFO
<PLS ><-------Name------->NBLKS Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
10 C, Forest, Flat 1 1 1 1 27 0
16 C, Lawn, Flat 1 1 1 1 27 0
11 C, Forest, Mod 1 1 1 1 27 0
END GEN-INFO
*** Section PWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ***
10 0 0 1 0 0 0 0 0 0 0 0 0
16 0 0 1 0 0 0 0 0 0 0 0 0
11 0 0 1 0 0 0 0 0 0 0 0 0
END ACTIVITY
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 24
PRINT-INFO
<PLS > ***************** Print-flags ***************************** PIVL PYR
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *********
10 0 0 4 0 0 0 0 0 0 0 0 0 1 9
16 0 0 4 0 0 0 0 0 0 0 0 0 1 9
11 0 0 4 0 0 0 0 0 0 0 0 0 1 9
END PRINT-INFO
PWAT-PARM1
<PLS > PWATER variable monthly parameter value flags ***
# - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT ***
10 0 0 0 0 0 0 0 0 0 0 0
16 0 0 0 0 0 0 0 0 0 0 0
11 0 0 0 0 0 0 0 0 0 0 0
END PWAT-PARM1
PWAT-PARM2
<PLS > PWATER input info: Part 2 ***
# - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC
10 0 4.5 0.08 400 0.05 0.5 0.996
16 0 4.5 0.03 400 0.05 0.5 0.996
11 0 4.5 0.08 400 0.1 0.5 0.996
END PWAT-PARM2
PWAT-PARM3
<PLS > PWATER input info: Part 3 ***
# - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP
10 0 0 2 2 0 0 0
16 0 0 2 2 0 0 0
11 0 0 2 2 0 0 0
END PWAT-PARM3
PWAT-PARM4
<PLS > PWATER input info: Part 4 ***
# - # CEPSC UZSN NSUR INTFW IRC LZETP ***
10 0.2 0.5 0.35 6 0.5 0.7
16 0.1 0.25 0.25 6 0.5 0.25
11 0.2 0.5 0.35 6 0.5 0.7
END PWAT-PARM4
PWAT-STATE1
<PLS > *** Initial conditions at start of simulation
ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 ***
# - # *** CEPS SURS UZS IFWS LZS AGWS GWVS
10 0 0 0 0 2.5 1 0
16 0 0 0 0 2.5 1 0
11 0 0 0 0 2.5 1 0
END PWAT-STATE1
END PERLND
IMPLND
GEN-INFO
<PLS ><-------Name-------> Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
1 ROADS/FLAT 1 1 1 27 0
END GEN-INFO
*** Section IWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW IWAT SLD IWG IQAL ***
1 0 0 1 0 0 0
END ACTIVITY
PRINT-INFO
<ILS > ******** Print-flags ******** PIVL PYR
# - # ATMP SNOW IWAT SLD IWG IQAL *********
1 0 0 4 0 0 0 1 9
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 25
END PRINT-INFO
IWAT-PARM1
<PLS > IWATER variable monthly parameter value flags ***
# - # CSNO RTOP VRS VNN RTLI ***
1 0 0 0 0 0
END IWAT-PARM1
IWAT-PARM2
<PLS > IWATER input info: Part 2 ***
# - # *** LSUR SLSUR NSUR RETSC
1 400 0.01 0.1 0.1
END IWAT-PARM2
IWAT-PARM3
<PLS > IWATER input info: Part 3 ***
# - # ***PETMAX PETMIN
1 0 0
END IWAT-PARM3
IWAT-STATE1
<PLS > *** Initial conditions at start of simulation
# - # *** RETS SURS
1 0 0
END IWAT-STATE1
END IMPLND
SCHEMATIC
<-Source-> <--Area--> <-Target-> MBLK ***
<Name> # <-factor-> <Name> # Tbl# ***
Basin 1***
PERLND 10 4.42 COPY 501 12
PERLND 10 4.42 COPY 501 13
PERLND 16 1.14 COPY 501 12
PERLND 16 1.14 COPY 501 13
PERLND 11 0.81 COPY 501 12
PERLND 11 0.81 COPY 501 13
IMPLND 1 0.5 COPY 501 15
******Routing******
END SCHEMATIC
NETWORK
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
END NETWORK
RCHRES
GEN-INFO
RCHRES Name Nexits Unit Systems Printer ***
# - #<------------------><---> User T-series Engl Metr LKFG ***
in out ***
END GEN-INFO
*** Section RCHRES***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ***
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ******************* PIVL PYR
# - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR *********
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 26
END PRINT-INFO
HYDR-PARM1
RCHRES Flags for each HYDR Section ***
# - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each
FG FG FG FG possible exit *** possible exit possible exit
* * * * * * * * * * * * * * ***
END HYDR-PARM1
HYDR-PARM2
# - # FTABNO LEN DELTH STCOR KS DB50 ***
<------><--------><--------><--------><--------><--------><--------> ***
END HYDR-PARM2
HYDR-INIT
RCHRES Initial conditions for each HYDR section ***
# - # *** VOL Initial value of COLIND Initial value of OUTDGT
*** ac-ft for each possible exit for each possible exit
<------><--------> <---><---><---><---><---> *** <---><---><---><---><--->
END HYDR-INIT
END RCHRES
SPEC-ACTIONS
END SPEC-ACTIONS
FTABLES
END FTABLES
EXT SOURCES
<-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # ***
WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC
WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC
WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP
WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP
END EXT SOURCES
EXT TARGETS
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ***
<Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg***
COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL
COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL
END EXT TARGETS
MASS-LINK
<Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->***
<Name> <Name> # #<-factor-> <Name> <Name> # #***
MASS-LINK 12
PERLND PWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 12
MASS-LINK 13
PERLND PWATER IFWO 0.083333 COPY INPUT MEAN
END MASS-LINK 13
MASS-LINK 15
IMPLND IWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 15
END MASS-LINK
END RUN
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 27
Predeveloped HSPF Message File
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 28
Mitigated HSPF Message File
18396-forest terrace-bypass 10/18/2018 1:56:10 PM Page 29
Disclaimer
Legal Notice
This program and accompanying documentation are provided 'as-is' without warranty of any kind. The
entire risk regarding the performance and results of this program is assumed by End User. Clear
Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either
expressed or implied, including but not limited to implied warranties of program and accompanying
documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever
(including without limitation to damages for loss of business profits, loss of business information,
business interruption, and the like) arising out of the use of, or inability to use this program even
if Clear Creek Solutions Inc. or their authorized representatives have been advised of the
possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2018; All
Rights Reserved.
Clear Creek Solutions, Inc.
6200 Capitol Blvd. Ste F
Olympia, WA. 98501
Toll Free 1(866)943-0304
Local (360)943-0304
www.clearcreeksolutions.com
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLAT
PULTE GROUP, INC3535 FACTORIA BLVD S.E., #600
BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000817/14/2020
FOREST TERRACE PLAT
SCALE: 1"=20'
SCALE: 1"=20'
SCALE: 1"=10'
R-404826
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLAT
PULTE GROUP, INC3535 FACTORIA BLVD S.E., #600
BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000817/9/2020
FOREST TERRACE PLAT
SCALE: 1"=20'
R-404827
EXTEND VAULTTO MATCH FINISHED GRADEALTERNATE PIPE
LOCATION (TYP)HYDRAULIC DROP(H) INLET INV.TO OUTLET INV.6'-0"12'-0"
FLOW SPREADER & BAFFLE
WALL (TYP OF 2)
PERMANENT
POOL ELEV.
ENERGY
DISSIPATOR
STORMFILTER
CARTRIDGE
(4'-5")1'-6"FILTRATION BAY
OUTLET
BAY
STORMFILTER
CARTRIDGE
FLOW KIT
(3'-7")1'-6"PLAN VIEW
VAULT STYLE: INLET BAY - OUTLET BAY
INLET BAY
FLOW
INLET PIPE
INLET
SECTION A-A
OUTLET
AA
TOP SLAB ACCESS
SEE FRAME AND
COVER DETAIL
6" CONCRETE
WALL WIDTH
MAY VARY
REGIONALLY
OUTLET PIPE
STEP
FRAME AND COVER
(DIAMETER VARIES)
N.T.S.
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLAT
PULTE GROUP, INC3535 FACTORIA BLVD S.E., #600
BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000817/9/2020
FOREST TERRACE PLAT
800-338-1122 513-645-7000 513-645-7993 FAX
9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069
6x12
STORMFILTER
STANDARD DETAIL
P:\18000S\18396\ENGINEERING\18396-M5.DWG 7/9/2020 4:21 PMTHIS PRODUCT MAY BE PROTECTED BY ONE OR MORE OF THE FOLLOWINGU.S. PATENTS: 5,322,629; 5,524,576; 5,707,527; 5,985,157; 6,027,639; 6,649,048;RELATED FOREIGN PATENTS, OR OTHER PATENTS PENDING.
GENERAL NOTES
1.CONTECH TO PROVIDE ALL MATERIALS UNLESS NOTED OTHERWISE.
2.DIMENSIONS MARKED WITH ( ) ARE REFERENCE DIMENSIONS. ACTUAL DIMENSIONS MAY VARY.
3.FOR SITE SPECIFIC DRAWINGS WITH DETAILED VAULT DIMENSIONS AND WEIGHTS, PLEASE CONTACT YOUR CONTECH ENGINEERED SOLUTIONS
LLC REPRESENTATIVE. www.ContechES.com
4.STORMFILTER WATER QUALITY STRUCTURE SHALL BE IN ACCORDANCE WITH ALL DESIGN DATA AND INFORMATION CONTAINED IN THIS
DRAWING.
5.STRUCTURE SHALL MEET AASHTO HS20 LOAD RATING, ASSUMING EARTH COVER OF 0' - 5' AND GROUNDWATER ELEVATION AT, OR BELOW, THE
OUTLET PIPE INVERT ELEVATION. ENGINEER OF RECORD TO CONFIRM ACTUAL GROUNDWATER ELEVATION. CASTINGS SHALL MEET AASHTO
M306 AND BE CAST WITH THE CONTECH LOGO.
6.FILTER CARTRIDGES SHALL BE MEDIA-FILLED, PASSIVE, SIPHON ACTUATED, RADIAL FLOW, AND SELF CLEANING. RADIAL MEDIA DEPTH SHALL
BE 7-INCHES. FILTER MEDIA CONTACT TIME SHALL BE AT LEAST 38 SECONDS.
7.SPECIFIC FLOW RATE IS EQUAL TO THE FILTER TREATMENT CAPACITY (gpm) DIVIDED BY THE FILTER CONTACT SURFACE AREA (sq ft).
8.STORMFILTER STRUCTURE SHALL BE PRECAST CONFORMING TO ASTM C-857 AND AASHTO LOAD FACTOR DESIGN METHOD.
INSTALLATION NOTES
A.ANY SUB-BASE, BACKFILL DEPTH, AND/OR ANTI-FLOTATION PROVISIONS ARE SITE-SPECIFIC DESIGN CONSIDERATIONS AND SHALL BE
SPECIFIED BY ENGINEER OF RECORD.
B.CONTRACTOR TO PROVIDE EQUIPMENT WITH SUFFICIENT LIFTING AND REACH CAPACITY TO LIFT AND SET THE STORMFILTER VAULT (LIFTING
CLUTCHES PROVIDED).
C.CONTRACTOR TO INSTALL JOINT SEALANT BETWEEN ALL VAULT SECTIONS AND ASSEMBLE VAULT.
D.CONTRACTOR TO PROVIDE, INSTALL, AND GROUT PIPES. MATCH OUTLET PIPE INVERT WITH OUTLET BAY FLOOR.
E.CONTRACTOR TO TAKE APPROPRIATE MEASURES TO PROTECT CARTRIDGES FROM CONSTRUCTION-RELATED EROSION RUNOFF.
www.contechES.com
STORMFILTER DESIGN NOTES
CARTRIDGE HEIGHT
SPECIFIC FLOW RATE (gpm/sf)
CARTRIDGE FLOW RATE (gpm)
RECOMMENDED HYDRAULIC DROP (H)
27"18"LOW DROP
3.05'2.3'1.8'
CARTRIDGE SELECTION
18.79 12.53 8.35
2 gpm/sf
22.5 11.25 15 10 57.5
1.67* gpm/sf 1 gpm/sf 2 gpm/sf 1.67* gpm/sf 1 gpm/sf 2 gpm/sf 1.67* gpm/sf 1 gpm/sf
* 1.67 gpm/sf SPECIFIC FLOW RATE IS APPROVED WITH PHOSPHOSORB® (PSORB) MEDIA ONLY
STORMFILTER TREATMENT CAPACITY IS A FUNCTION OF THE CARTRIDGE SELECTION AND THE NUMBER OF CARTRIDGES. THE STANDARD VAULT
STYLE IS SHOWN WITH THE MAXIMUM NUMBER OF CARTRIDGES (11), VAULT STYLE OPTIONS INCLUDE, OUTLET BAY (11), FULL HEIGHT BAFFLE WALL
(12). STORMFILTER 6X12 PEAK HYDRAULIC CAPACITY IS 1.6 CFS. IF THE SITE CONDITIONS EXCEED 1.6 CFS AN UPSTREAM BYPASS STRUCTURE IS
REQUIRED.
STRUCTURE ID
WATER QUALITY FLOW RATE (cfs)
PEAK FLOW RATE (cfs)
RETURN PERIOD OF PEAK FLOW (yrs)
NUMBER OF CARTRIDGES REQUIRED
MEDIA TYPE (PERLITE, ZPG, PSORB)
PIPE DATA:I.E.MATERIAL DIAMETER
INLET PIPE #1
INLET PIPE #2
OUTLET PIPE
SITE SPECIFIC
DATA REQUIREMENTS
WIDTH HEIGHTANTI-FLOTATION BALLAST
NOTES/SPECIAL REQUIREMENTS:
DOWNSTREAM RIM ELEVATION
CARTRIDGE FLOW RATE
* PER ENGINEER OF RECORD
CARTRIDGE HEIGHT (27", 18", LOW DROP(LD))
UPSTREAM RIM ELEVATION
**
362.40
24"LCPE352.43
***
24"LCPE355.48
ZPG
*
14
100-YR
7.43
0.35
*
27"
362.85
R-404828
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLAT
PULTE GROUP, INC3535 FACTORIA BLVD S.E., #600
BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000817/9/2020
FOREST TERRACE PLAT
SCALE: 1"=20'
SCALE: 1"=5'
SCALE: 1"=20'SCALE: 1"=5'
R-404829
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLAT
PULTE GROUP, INC3535 FACTORIA BLVD S.E., #600
BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000817/9/2020
FOREST TERRACE PLAT
SCALE: 1"=20'
SCALE: 1"=5'
SCALE: 1"=20'
R-404830
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLAT
PULTE GROUP, INC3535 FACTORIA BLVD S.E., #600
BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000817/9/2020
FOREST TERRACE PLAT
SCALE: 1"=20'
SCALE: 1"=5'
SCALE: 1"=20'
R-404831
Project Name:Forest Terrace
Site Designation:StormFilter Date:11/1/19
County or Independent City:Renton Designer:JMD
State:WA
Flow Based Data:
Peak Design Flow (cfs)
Water Quality Flow (cfs)
Annual Rainfall (inches)
Total Drainage Area, A (ac)
Post Development Impervious Area, AI (ac)
Pervious Area, AP (ac)
Impervious Runoff Coefficient, Rv
Pervious Runoff Coefficient, Rv
% Impervious
Runoff Coefficient, Rc
TSS Removal By Pretreatment
Agency Required TSS % Removal
Required TSS Removal Efficiency of Filter
Percent Runoff Capture
Mean Annual Runoff, Vt (ft3)
Event Mean Concentration of Pollutant, EMC (mg/L)
Annual Mass Load, Mtotal (lbs)
Flow Based Filter Sizing:
Mass to be Captured by System (lbs)
Filter Type
Structure Type
Cartridge Height
Media Type
Cartridge Flow Rate, gpm/sf
Allowable Load Per Cartridge (lbs)
Cartridges Required
TSS Treatment Capacity (lbs)
Maximum Water Quality Flow
7.43
50%
60%
8.03
38%
0.95
0.25
0.52
80%
3282.49
60
756.00
0.35 cfs
27''
54
14
1.00 gpm/sf
ZPG
40
12.98
4.95
0.35
StormFilter
Vault
90%
876,863
984.75
Access Hatch
Solutions
2
Access Hatch Solutions
ejco.com 800 626 4653
Access Hatch Solutions
Product Description Page
Aluminum Access Hatches Access Hatch Load Ratings
Aluminum Hatch Frame Design Choices
Aluminum Hatch Features and Options
Lift Assist — Pneumatic Lift Assist for Aluminum Hatches
SAFE HATCH® Safety Grate System
ALN Series Angle Frame Pedestrian Rated
ALN Series with Safe Hatch® Safety Grate System
CLN Series Channel Frame Pedestrian Rated
CLN Series with Safe Hatch® Safety Grate System
CLS Series Channel Frame, Pedestrian Rated, Lift Assist
AHS Series Angle Frame, H20, Lift Assist
AHS Series with Safe Hatch® Safety Grate System
CHS Series Channel Frame, H20, Lift Assist
CHS Series with Safe Hatch® Safety Grate System
Infill Floor Doors
4
4
5
6
7
8
9
11
12
14
15
16
18
19
21
Ductile Iron Access Hatches Ductile Iron Hinged Hatch Access Assembly
Forming Skirts
ERMATIC® Modular Covers
22
24
25
Table of Contents Access Hatch Load Ratings
Aluminum Access Hatches
Ductile Iron Access Hatches
4
8
22
3
Access Hatch Solutions
ejco.com 800 626 4653
Aluminum Access Hatches for
Non-Traffic or Unintended Vehicular Traffic
Ductile Iron Access Hatches for
Heavy Duty Traffic
Ductile Iron Access Hatches for
Extra Heavy Duty Airport Traffic
EJ has a broad offering of access hatch products
available in aluminum, steel and ductile iron.
Our hatches are designed to provide easy and secure
access to below ground, and below floor installations.
Access hatches are used in areas such as sewer
pump stations, water treatment plants, gas valve
vaults, water meter pits, water valve vaults, telephone
and electric vaults, industrial plant pits, ventilation
shafts, fuel storage pits, de-icing control facilities,
storm drains, monitoring wells and collection pits.
4
Access Hatch Solutions
ejco.com 800 626 4653
Load Ratings, Aluminum Frame Designs
Access Hatch Load Requirements
Non-traffic Load Requirement
·Non-traffic, pedestrian rated
·Material is aluminum
·300 lbs per square foot live load
·Deflection shall not exceed 1/150th of the span
Unintended Vehicular Traffic Load Requirement
·Unintended vehicular traffic
·Material is aluminum
·20,800 lbs (16,000 lbs plus 30% impact factor) on a
10" x 20" tire contact area
·AASHTO H20 Standard Specifications for Highway Bridges*
Do not place in wheel line
Vehicular Traffic Load Requirement
·Heavy duty vehicular traffic
·Material is ductile iron
·AASHTO M306 loading*
·40,000 lbs (16,000 lbs plus 250% safety factor) on a
9" x 9" tire contact area
·Proof load tested for 1 minute without failure
Airport Load Requirement
·Extra heavy duty airport and port authority traffic
·Material is ductile iron
·Proof load tested on a 9" x 9" tire contact area to a minimum of
200,000 lbs
*AASHTO H20 per the Standard Specifications for Highway Bridges is
theoretical hand calculations with other safety factors vs actual proof
load testing for AASHTO M306 Standard Specification for Drainage,
Sewer, Utility, and Related Castings.
Load Requirement Definitions
Aluminum Frame Design Choices
Angle Frames — Non channeling
Channel Frames — Channels water away from hatch
ALN Series
AHS Series
ALN Series
CLN Series
CLS Series
CHS Series
CLN Series
CHS Series
Drain Coupling
Drain coupling helps divert water away from the hatch structure.
Water is directed through the channel in the frame to a drain coupler,
which is connected to a drainage pipe. In this series, the standard
coupler location is on the bottom of the frame.
Rainwater Flow
1/4" Cover
Channel
Frame
1-1/2" Drain
Coupler
Concrete
Drain coupling helps divert water away
from hatch structure.
5
Access Hatch Solutions
ejco.com 800 626 4653
Aluminum Hatch Features and Options
Aluminum Hatch Features and Options
Recessed padlock clip in
open position
Recessed padlock clip in
closed position
Slam lock with plugSlam lock T-handle in slam lock
Exposed padlock clip
Aluminum plate treated
with safety sure grip
Regular non-treated
aluminum plate
Stainless steel hinge Lift handle
Pentahead plug and post
key
Nut rail—offers attachment points for spring nut and
bolt systems, conduit clamps, or other connectors
Uncompressed Gasket Debris Gasket
LDT
Aluminum
Extrusion
Cover
Odor
Suppression
Gasket
Odor suppressive application rim seal gasket
Safety chain—provides a visual barrier while the doors
are open
Skirt/Riser—built to match slab thickness (see page 24
for additional information)
6
Access Hatch Solutions
ejco.com 800 626 4653
Lift Assist for Aluminum and Steel Hatches
Lift Assist — Pneumatic Lift Assist for Aluminum and Steel Access Hatches
Lift Assist
Pneumatic lift assist to easily open steel and aluminum
access hatches.
The quality, precision built Pneu-Spring’s
piston and rod design is custom loaded with
job specific internal gas pressure to ensure
smooth, easy operation of any size hatch.
Piston rod
Floating piston
Schrader valve
Floating piston detail
Oil reservoir
Oil reservoir
The Pneu-Spring’s oil
reservoir and heavy duty
stainless steel construction
allow for years of trouble-
free operation.
CNC Controlled Precision Quality
Reliable—smooth operation year after year
·Under laboratory conditions our industrial Pneu-Springs have a proven cycle life of over
250,000 cycles.
·Durable: Heavy duty stainless steel construction
·Quality materials are assembled with close manufacturing tolerances to assure long life.
·Easy maintenance: Trouble-free operation
·In the event a lift assist component must be replaced, removal and re-installation is a simple
matter requiring the removal of just three bolts.
·Space saving: Fits in confined spaces
·The Pneu-Spring design allows the lift assist to be installed in a horizontal position where the
lift assist device mounts can be confined to the concrete slab thickness.
7
Access Hatch Solutions
ejco.com 800 626 4653
Safety Grate System
Closed safety grates
Safety orange painted aluminum grates provide 300 psf non-traffic pedestrian rated
fall through protection
Aluminum 1/4" diamond plate cover with all stainless steel hardware
Open safety grates
Safety orange painted aluminum grates provide a visual barrier around pit
SAFE HATCH® Safety Grate System
Safety and Security
Our SAFE HATCH® safety grates, a patented design, cover an
opening and provide fall through protection in conformance with
OSHA standard 1910.23.
Standard Features
·Doors cannot be closed unless the fall through protection has been
put back in place (protecting the next operator).
·Visual inspections and limited main tenance can be done while safety
grate is left in place.
·Safety orange aluminum grates create a visual barrier around the pit.
The orange epoxy painted grates create an awareness of the hazard.
Quality Components
Built with all stainless steel hardware, grates are also designed to
withstand corrosive environments and provide 300 psf
pedestrian rated fall through protection. Also available in H20
for low density traffic.
State-of-the-Art Manufacturing
We strive for continuous improvement in all of our manufacturing
processes. Lean manufacturing techniques translate into savings for
our customers and improved lead times.
8
Access Hatch Solutions
ejco.com 800 626 4653
ALN Series Angle Frame, Pedestrian Rated
ALN SERIES
ANGLE FRAME, PEDESTRIAN RATED
(LEC & LECD)
Lift Handle
B A
B1
A1
2 9/16"
Exposed
Padlock Clip
Lock Arm
Exposed
Padlock Clip
Lock Arm
B A
B1
A1
2 9/16"
Lift
Handles
ALN Series Angle Frame, Pedestrian Rated
Catalog Single Cover
Number
Aluminum
Description Inside Dim.
A x A1
Outside Dim.
B x B1
Weight
H24241001 1 Door Hatch 24 x 24 26 1/2 x 26 1/2 15
H24301001 1 Door Hatch 24 x 30 26 1/2 x 32 1/2 20
H24361001 1 Door Hatch 24 x 36 26 1/2 x 38 1/2 28
H30301001 1 Door Hatch 30 x 30 32 1/2 x 32 1/2 25
H30361001 1 Door Hatch 30 x 36 32 1/2 x 38 1/2 34
H30481001 1 Door Hatch 30 x 48 32 1/2 x 50 1/2 44
H36361001 1 Door Hatch 36 x 36 38 1/2 x 38 1/2 40
H36481001 1 Door Hatch 36 x 48 38 1/2 x 50 1/2 52
H42421001 1 Door Hatch 42 x 42 44 1/2 x 44 1/2 53
H30481101 2 Door Hatch 30 x 48 32 1/2 x 50 1/2 25
H30541101 2 Door Hatch 30 x 54 32 1/2 x 56 1/2 29
H36481101 2 Door Hatch 36 x 48 38 1/2 x 50 1/2 31
H36601101 2 Door Hatch 36 x 60 38 1/2 x 62 1/2 37
H42481101 2 Door Hatch 42 x 48 44 1/2 x 50 1/2 36
H48481101 2 Door Hatch 48 x 48 50 1/2 x 50 1/2 41
H48541101 2 Door Hatch 48 x 54 50 1/2 x 56 1/2 45
H48721101 2 Door Hatch 48 x 72 50 1/2 x 74 1/2 58
H60601101 2 Door Hatch 60 x 60 62 1/2 x 62 1/2 66
Note: All dimensions are in inches. All weights are in pounds.
·Non-traffic, pedestrian rated
·Red stainless steel hold open arm
·Heavy duty stainless steel hinges
·Exposed padlock clip
·Aluminum lift handle
·Extruded aluminum frame
·1/4" aluminum diamond plate cover
See aluminum hatch options page 5 for
additional options.
No vehicle traffic allowed.
9
Access Hatch Solutions
ejco.com 800 626 4653
ALN Series with SAFE HATCH® Safety Grate System
ALN SERIES WITH SAFE HATCH® SAFETY GRATE SYSTEM
(LEC-AOSG) PEDESTRIAN RATED
Single Grate, Single Cover Style
SAFE HATCH®
safety grate
fall through protection
Double Grate, Single Cover Style
·Non-traffic, pedestrian rated
·Epoxy painted safety orange aluminum
safety grate system for fall through
protection and controlled confined
space entry
·Heavy duty stainless steel hinges
·Exterior of frame coated with black primer
·Stainless steel slam lock with removable
t-handle and threaded stainless steel plug
·Stainless steel hardware
·Aluminum lift handle
·Extruded aluminum frame
·1/4" aluminum diamond plate cover
See aluminum hatch options page 5 for
additional options.
No vehicle traffic allowed.
10
Access Hatch Solutions
ejco.com 800 626 4653
ALN Series with SAFE HATCH® Safety Grate System
ALN Series with SAFE HATCH® Safety Grate System
Catalog Number Description Unobstructed Clear Opening Dimensions Dimensions Height Diagonal
Aluminum O x O1 A x A1 B x B1 C D
H24241091 1 Door Hatch 24 x 24 25 x 27 1/4 27 1/2 x 31 1/2 2 9/16 41 13/16
H24301091 1 Door Hatch 24 x 30 25 x 33 1/4 27 1/2 x 37 1/2 2 9/16 46 1/2
H24361091 1 Door Hatch 24 x 36 25 x 39 1/4 27 1/2 x 43 1/2 2 9/16 51 7/16
H30301091 1 Door Hatch 30 x 30 31 x 33 1/4 33 1/2 x 37 1/2 2 9/16 50 5/16
H30361091 1 Door Hatch 30 x 36 31 x 39 1/4 33 1/2 x 43 1/2 2 9/16 54 7/8
H36361091 1 Door Hatch 36 x 36 37 x 39 1/4 39 1/2 x 43 1/2 2 9/16 58 3/4
H42421091 1 Door Hatch 42 x 42 43 x 46 1/4 45 1/2 x 50 1/2 2 9/16 68
Single Grate, Single Cover Style
Double Grate, Single Cover Style
Double Grate, Double Cover Style
H30481091 1 Door Hatch 30 x 48 30 x 55 36 x 57 1/2 2 9/16 67 13/16
H36481091 1 Door Hatch 36 x 48 36 x 55 42 x 57 1/2 2 9/16 71 3/16
ALN SERIES WITH SAFE HATCH® SAFETY GRATE SYSTEM (CONTINUED)
(LECD-AOSG) PEDESTRIAN RATED
H30481191 2 Door Hatch 30 x 48 30 x 55 36 x 57 1/2 2 9/16 67 13/16
H30541191 2 Door Hatch 30 x 54 30 x 61 36 x 63 1/2 2 9/16 73
H36481191 2 Door Hatch 36 x 48 36 x 55 42 x 57 1/2 2 9/16 71 3/16
H36601191 2 Door Hatch 36 x 60 36 x 67 42 x 69 1/2 2 9/16 81 3/16
H42481191 2 Door Hatch 42 x 48 42 x 55 48 x 57 1/2 2 9/16 74 7/8
H48481191 2 Door Hatch 48 x 48 48 x 56 54 x 58 1/2 2 9/16 79 5/8
H48541191 2 Door Hatch 48 x 54 48 x 62 54 x 64 1/2 2 9/16 84 1/8
H48721191 2 Door Hatch 48 x 72 48 x 81 54 x 83 1/2 2 9/16 99 7/16
H60601191 2 Door Hatch 60 x 60 60 x 69 66 x 71 1/2 2 9/16 97 5/16
Note: All dimensions are in inches.
Double Grate, Double Cover Style
11
Access Hatch Solutions
ejco.com 800 626 4653
CLN Series Channel Frame, Pedestrian Rated
CLN SERIES
CHANNEL FRAME, PEDESTRIAN RATED
(LDT & LDTD)
Exposed Padlock Clip
Anchor
3 1/2"
*Drain
CouplerLift
Handles
B1
A1
B A
Lift Handle Exposed
Padlock Clip
Anchor
3 1/2"
B A
B1
A1
Drain Coupler
must have up drainage pipe
CLN Series Channel Frame, Pedestrian Rated
Catalog Single Cover
Number
Aluminum
Description Inside Dim.
A x A1
Outside Dim.
B x B1
Weight
H24241401 1 Door Hatch 24 x 24 30 x 30 21
H24301401 1 Door Hatch 24 x 30 30 x 36 26
H24361401 1 Door Hatch 24 x 36 30 x 42 35
H30301401 1 Door Hatch 30 x 30 36 x 36 32
H30361401 1 Door Hatch 30 x 36 36 x 42 42
H30481401 1 Door Hatch 30 x 48 36 x 54 54
H36361401 1 Door Hatch 36 x 36 42 x 42 49
H36481401 1 Door Hatch 36 x 48 42 x 54 62
H42421401 1 Door Hatch 42 x 42 48 x 48 64
H30481501 2 Door Hatch 30 x 48 36 x 54 29
H30541501 2 Door Hatch 30 x 54 36 x 60 33
H36481501 2 Door Hatch 36 x 48 42 x 54 36
H36601501 2 Door Hatch 36 x 60 42 x 66 43
H42481501 2 Door Hatch 42 x 48 48 x 54 41
H48481501 2 Door Hatch 48 x 48 54 x 54 48
H48541501 2 Door Hatch 48 x 54 54 x 60 54
H48721501 2 Door Hatch 48 x 72 54 x 78 67
H60601501 2 Door Hatch 60 x 60 66 x 66 73
Note: All dimensions are in inches. All weights are in pounds.*Drain Coupler
must have up
drainage pipe
·Non-traffic, pedestrian rated
·Red stainless steel hold open arm
·Heavy duty stainless steel hinges
·Exposed padlock clip
·Extruded aluminum channel frame with
1 1/2" drain coupler on underside of frame
·Aluminum lift handle
·1/4" aluminum diamond plate cover
See aluminum hatch options page 5 for
additional options.
No vehicle traffic allowed.
12
Access Hatch Solutions
ejco.com 800 626 4653
CLN Series with SAFE HATCH® Safety Grate System
CLN SERIES WITH SAFE HATCH® SAFETY GRATE SYSTEM
(DT-AOSG) PEDESTRIAN RATED
SAFE HATCH®
safety grate
fall through protection
Single Grate, Single Cover Style
Double Grate, Single Cover Style
·Non-traffic, pedestrian rated
·Epoxy painted safety orange aluminum
safety grate system for fall through
protection and controlled confined space
entry
·Red stainless steel hold open arm
·Heavy duty stainless steel hinges
·Extruded aluminum channel frame with
·1 1/2" drain coupler on underside of frame
·1/8" cushion o-ring gasket
·Exterior of frame coated with black primer
·Stainless steel slam lock with removable
t-handle and threaded stainless steel plug
·Aluminum lift handle
·1/4" aluminum diamond plate cover
See aluminum hatch options page 5 for
additional options.
No vehicle traffic allowed.
13
Access Hatch Solutions
ejco.com 800 626 4653
CLN Series with SAFE HATCH® Safety Grate System
CLN Series with SAFE HATCH® Safety Grate System
Catalog Number Description Unobstructed Clear Opening Dimensions Dimensions Height Diagonal
Aluminum O x O1 A x A1 B x B1 C D
H24243191 1 Door Hatch 24 x 24 28 x 30 36 1/2 x 38 1/2 3 1/2 53 1/16
H24303191 1 Door Hatch 24 x 30 28 x 36 36 1/2 x 44 1/2 3 1/2 57 9/16
H24363191 1 Door Hatch 24 x 36 28 x 42 36 1/2 x 50 1/2 3 1/2 62 5/16
H30303191 1 Door Hatch 30 x 30 34 x 36 42 1/2 x 44 1/2 3 1/2 61 9/16
H30363191 1 Door Hatch 30 x 36 34 x 42 42 1/2 x 50 1/2 3 1/2 66
H36363191 1 Door Hatch 36 x 36 40 x 42 48 1/2 x 50 1/2 3 1/2 70 1/16
H42423191 1 Door Hatch 42 x 42 46 x 48 54 1/2 x 56 1/2 5 1/2 78 1/2
Single Grate, Single Cover Style
Double Grate, Single Cover Style
Double Grate, Double Cover Style
Double Grate, Double Cover Style
H30483191 1 Door Hatch 30 x 48 34 x 55 42 1/2 x 63 1/2 3 1/2 76 7/16
H42423191 1 Door Hatch 36 x 48 40 x 55 48 1/2 x 63 1/2 3 1/2 79 15/16
CLN SERIES WITH SAFE HATCH® SAFETY GRATE SYSTEM (CONTINUED)
(DT-AOSG) PEDESTRIAN RATED
H30483291 2 Door Hatch 30 x 48 35 x 48 43 1/2 x 56 1/2 3 1/2 71 5/16
H30543291 2 Door Hatch 30 x 54 35 x 54 43 1/2 x 62 1/2 3 1/2 76 1/8
H36483291 2 Door Hatch 36 x 48 41 x 48 49 1/2 x 56 1/2 3 1/2 75 1/8
H36603291 2 Door Hatch 36 x 60 41 x 60 49 1/2 x 68 1/2 3 1/2 84 1/2
H42483291 2 Door Hatch 42 x 48 47 x 48 55 1/2 x 56 1/2 3 1/2 79 3/16
H48483291 2 Door Hatch 48 x 48 53 x 48 61 1/2 x 56 1/2 5 1/2 83 1/2
H48543291 2 Door Hatch 48 x 54 53 x 54 61 1/2 x 62 1/2 5 1/2 87 11/16
H48723291 2 Door Hatch 48 x 72 53 1/2 x 72 62 x 80 1/2 5 1/2 10 15/8
H60603291 2 Door Hatch 60 x 60 65 1/2 x 60 74 x 68 1/2 5 1/2 100 13/16
H48603291 2 Door Hatch 48 x 60 53 1/2 x 60 62 x 68 1/2 5 1/2 92 3/8
H60723291 2 Door Hatch 60 x 72 67 x 72 75 1/2 x 80 1/2 5 1/2 110 3/8
Note: All dimensions are in inches.
14
Access Hatch Solutions
ejco.com 800 626 4653
CLS Series Channel Frame, Pedestrian Rated, Lift Assist
CLS SERIES
CHANNEL FRAME, PEDESTRIAN RATED, LIFT ASSIST
(CH & CHD)
Lift Handle Slam Lock
Drain Coupler must
have up drainage pipe
BA
3 1/2"
B1
A1
CLS Series Channel Frame, Pedestrian Rated, Lift Assist
Catalog
Number
Aluminum
Description Inside Dim.
A x A1
Outside Dim.
B x B1
H24241601 1 Door Hatch 24 x 24 32 1/2 x 32 1/2
H30301601 1 Door Hatch 30 x 30 38 1/2 x 38 1/2
H30361601 1 Door Hatch 30 x 36 38 1/2 x 44 1/2
H30481601 1 Door Hatch 30 x 48 38 1/2 x 56 1/2
H36361601 1 Door Hatch 36 x 36 44 1/2 x 44 1/2
H36481601 1 Door Hatch 36 x 48 44 1/2 x 56 1/2
H42421601 1 Door Hatch 42 x 42 50 1/2 x 50 1/2
H30601701 2 Door Hatch 30 x 60 38 1/2 x 68 1/2
H36601701 2 Door Hatch 36 x 60 44 1/2 x 68 1/2
H36721701 2 Door Hatch 36 x 72 44 1/2 x 80 1/2
H48481701 2 Door Hatch 48 x 48 56 1/2 x 56 1/2
H48721701 2 Door Hatch 48 x 72 56 1/2 x 80 1/2
H60601701 2 Door Hatch 60 x 60 68 1/2 x 68 1/2
Note: All dimensions are in inches.
Lift Handle Slam Lock
BA
3 1/2"
B1
A1
Drain Coupler must have up
drainage pipe
·Non-traffic, pedestrian rated
·Red stainless steel hold open arm
·Heavy duty stainless steel hinges
·Heavy duty stainless steel lift assist
·Extruded aluminum channel frame with
1 1/2" drain coupler on underside of frame
·1/8" cushion o-ring gasket
·Exterior of frame coated with black primer
·Stainless steel slam lock with removable
t-handle and threaded stainless steel plug
·Aluminum lift handle
·1/4" aluminum diamond plate cover
See aluminum hatch options page 5 for
additional options.
No vehicle traffic allowed.
15
Access Hatch Solutions
ejco.com 800 626 4653
AHS Series Angle Frame, H20, Lift Assist
AHS SERIES
ANGLE FRAME, H20, LIFT ASSIST
(EC-HD & ECD-HD)
A
Lift Handles Slam Lock
B1
A1
B
5 1/2"
A
Lift Handle Slam Lock
4"
B1
A1
B
AHS Series Angle Frame, H20, Lift Assist
Catalog
Number
Aluminum
Description Inside Dim.
A x A1
Outside Dim.
B x B1
Height
H24241201 1 Door Hatch 24 x 24 33 x 27 4
H24301201 1 Door Hatch 24 x 30 33 x 33 4
H24361201 1 Door Hatch 24 x 36 33 x 39 4
H30301201 1 Door Hatch 30 x 30 39 x 33 4
H30361201 1 Door Hatch 30 x 36 39 x 39 4
H30481201 1 Door Hatch 30 x 48 39 x 51 4
H36361201 1 Door Hatch 36 x 36 45 x 39 5 1/2
H36481201 1 Door Hatch 36 x 48 45 x 51 5 1/2
H42421201 1 Door Hatch 42 x 42 51 x 45 5 1/2
H30481301 2 Door Hatch 30 x 48 39 x 51 4
H30541301 2 Door Hatch 30 x 54 39 x 57 4
H36481301 2 Door Hatch 36 x 48 45 x 51 5 1/2
H36601301 2 Door Hatch 36 x 60 45 x 63 5 1/2
H42481301 2 Door Hatch 42 x 48 51 x 51 5 1/2
H48481301 2 Door Hatch 48 x 48 57 x 51 5 1/2
H48541301 2 Door Hatch 48 x 54 57 x 57 5 1/2
H48721301 2 Door Hatch 48 x 72 57 x 75 5 1/2
H60601301 2 Door Hatch 60 x 60 69 x 63 5 1/2
Note: All dimensions are in inches.
·Unintended vehicular traffic rated
·Red stainless steel hold open arm
·Heavy duty stainless steel hinges
·Heavy duty stainless steel lift assist
·Aluminum lift handle
·Extruded aluminum frame
·Exterior of frame coated with black primer
·Stainless steel slam lock with removable
t-handle and threaded stainless steel plug
·Heavy duty stainless steel lift handle
·1/4" aluminum diamond plate cover
See aluminum hatch options page 5 for
additional options.
Do not place in wheel line.
16
Access Hatch Solutions
ejco.com 800 626 4653
AHS Series with SAFE HATCH® Safety Grate System
AHS SERIES WITH SAFE HATCH® SAFETY GRATE SYSTEM
(EC-HD-AOSG & ECD-HD-AOSG)
SAFE HATCH®
safety grate
fall through protection
Single Grate, Single Cover Style
·Unintended vehicular traffic rated
·Epoxy painted safety orange aluminum
safety grate system for fall through
protection and controlled confined
space entry
·Red stainless steel hold open arm
·Heavy duty stainless steel hinges
·Heavy duty stainless steel lift assist
·Aluminum lift handle
·Extruded aluminum frame
·Exterior of frame coated with black primer
·Stainless steel slam lock with removable
t-handle and threaded stainless steel plug
·Heavy duty stainless steel lift handle
·1/4" aluminum diamond plate cover
See aluminum hatch options page 5 for
additional options.
Do not place in wheel line.
17
Access Hatch Solutions
ejco.com 800 626 4653
AHS Series with SAFE HATCH® Safety Grate System
AHS SERIES WITH SAFE HATCH® SAFETY GRATE SYSTEM (CONTINUED)
(EC-HD-AOSG & ECD-HD-AOSG)
AHS Series Angle Style, H20, Lift Assist with SAFE HATCH® Safety Grate System
Catalog Number Description Unobstructed Clear Opening Dimensions Dimensions Height Diagonal
Aluminum O x O1 A x A1 B x B1 C D
H24241291 1 Door Hatch 24 x 24 24 x 27 35 x 30 5 1/2 46 1/8
H24301291 1 Door Hatch 24 x 30 24 x 33 35 x 36 5 1/2 50 3/16
H24361291 1 Door Hatch 24 x 36 24 x 39 35 x 42 5 1/2 54 11/16
H30301291 1 Door Hatch 30 x 30 30 x 33 41 x 36 5 1/2 54 9/16
H30361291 1 Door Hatch 30 x 36 30 x 39 41 x 42 5 1/2 58 11/16
H30481291 1 Door Hatch 30 x 48 32 x 51 43 x 54 5 1/2 69
H36361291 1 Door Hatch 36 x 36 38 x 39 49 x 42 5 1/2 64 9/16
H36481291 1 Door Hatch 36 x 48 38 x 51 49 x 54 5 1/2 72 15/16
H42421291 1 Door Hatch 42 x 42 44 x 45 55 x 48 5 1/2 73
Single Grate, Single Cover Style
Double Grate, Double Cover Style
Double Grate, Double Cover Style
H30481391 2 Door Hatch 30 x 48 30 x 66 40 x 69 5 1/2 79 3/4
H30541391 2 Door Hatch 30 x 54 30 x 72 40 x 75 5 1/2 85
H36481391 2 Door Hatch 36 x 48 36 x 66 46 x 69 5 1/2 82 15/16
H36601391 2 Door Hatch 36 x 60 36 x 78 46 x 81 5 1/2 93 1/8
H42481391 2 Door Hatch 42 x 48 42 x 66 52 x 69 5 1/2 86 3/8
H48481391 2 Door Hatch 48 x 48 48 x 66 58 x 69 5 1/2 90 1/8
H48541391 2 Door Hatch 48 x 54 48 x 72 58 x 75 5 1/2 94 13/16
H48721391 2 Door Hatch 48 x 72 48 x 90 58 x 93 5 1/2 109 5/8
H60601391 2 Door Hatch 60 x 60 60 x 78 70 x 81 5 1/2 107 1/16
H48601391 2 Door Hatch 48 x 60 48 x 78 58 x 81 5 1/2 99 5/8
H60721391 2 Door Hatch 60 x 72 60 x 90 70 x 93 5 1/2 116 3/8
Note: All dimensions are in inches. All weights are in pounds.
18
Access Hatch Solutions
ejco.com 800 626 4653
CHS Series Channel Frame, H20, Lift Assist
CHS SERIES
CHANNEL FRAME, H20, LIFT ASSIST
(DT-HD & DTD-HD)
Lift Handles Slam Lock
BA
5 1/2"
Drain Coupler
B1
A1
CHS Series Channel Frame, H20, Lift Assist
Catalog
Number
Aluminum
Description Inside Dim.
A x A1
Outside Dim.
B x B1
Height
H24241801 1 Door Hatch 24 x 24 38 1/2 x 32 1/2 3 1/2
H24301801 1 Door Hatch 24 x 30 38 1/2 x 38 1/2 3 1/2
H24361801 1 Door Hatch 24 x 36 38 1/2 x 44 1/2 3 1/2
H30301801 1 Door Hatch 30 x 30 44 1/2 x 38 1/2 3 1/2
H30361801 1 Door Hatch 30 x 36 44 1/2 x 44 1/2 3 1/2
H30481801 1 Door Hatch 30 x 48 44 1/2 x 56 1/2 3 1/2
H36361801 1 Door Hatch 36 x 36 50 1/2 x 44 1/2 5 1/2
H36481801 1 Door Hatch 36 x 48 50 1/2 x 56 1/2 5 1/2
H42421801 1 Door Hatch 42 x 42 56 1/2 x 50 1/2 5 1/2
H30481901 2 Door Hatch 30 x 48 44 1/2 x 56 1/2 3 1/2
H30541901 2 Door Hatch 30 x 54 44 1/2 x 62 1/2 3 1/2
H36481901 2 Door Hatch 36 x 48 50 1/2 x 56 1/2 5 1/2
H36601901 2 Door Hatch 36 x 60 50 1/2 x 68 1/2 5 1/2
H42481901 2 Door Hatch 42 x 48 56 1/2 x 56 1/2 5 1/2
H48481901 2 Door Hatch 48 x 48 62 1/2 x 56 1/2 5 1/2
H48541901 2 Door Hatch 48 x 54 62 1/2 x 62 1/2 5 1/2
H48721901 2 Door Hatch 48 x 72 62 1/2 x 80 1/2 5 1/2
H60601901 2 Door Hatch 60 x 60 74 1/2 x 68 1/2 5 1/2
Note: All dimensions are in inches.
Lift Handle Slam Lock
BA
3 1/2"
B1
A1
Drain Coupler
must have up
drainage pipe
·Unintended vehicular traffic rated
·Red stainless steel hold open arm
·Heavy duty stainless steel hinges
·Heavy duty stainless steel lift assist
·Extruded aluminum channel frame with
1 1/2" drain coupler on underside of frame
·1/8" cushion o-ring gasket
·Exterior of frame coated with black primer
·Stainless steel slam lock with removable
t-handle and threaded stainless steel plug
·Heavy duty stainless steel lift handle
·1/4" aluminum diamond plate cover
See aluminum hatch options page 5 for
additional options.
Do not place in wheel line.
19
Access Hatch Solutions
ejco.com 800 626 4653
CHS Series with SAFE HATCH® Safety Grate System
CHS SERIES WITH SAFE HATCH® SAFETY GRATE SYSTEM
(DT-HD-AOSG & DTD-HD-AOSG)
SAFE HATCH®
safety grate
fall through protection
Single Grate, Single Cover Style
·Unintended vehicular traffic rated
·Epoxy painted safety orange aluminum
safety grate system for fall through
protection and controlled confined
space entry
·Red stainless steel hold open arm
·Heavy duty stainless steel hinges
·Heavy duty stainless steel lift assist
·Extruded aluminum channel frame with
1 1/2" drain coupler on underside of frame
·1/8" cushion o-ring gasket
·Exterior of frame coated with black primer
·Stainless steel slam lock with removable
t-handle and threaded stainless steel plug
·Heavy duty stainless steel lift handle
·1/4" aluminum diamond plate cover
See aluminum hatch options page 5 for
additional options.
Do not place in wheel line.
20
Access Hatch Solutions
ejco.com 800 626 4653
CHS Series with SAFE HATCH® Safety Grate System
CHS SERIES WITH SAFE HATCH® SAFETY GRATE SYSTEM (CONTINUED)
(DT-HD-AOSG & DTD-HD-AOSG)
H30481991 2 Door Hatch 30 x 48 30 x 58 44 1/2 x 66 1/2 5 1/2 80
H30541991 2 Door Hatch 30 x 54 30 x 64 44 1/2 x 72 1/2 5 1/2 85 1/16
H36481991 2 Door Hatch 36 x 48 36 x 58 50 1/2 x 66 1/2 5 1/2 83 1/2
H36601991 2 Door Hatch 36 x 60 36 x 70 50 1/2 x 78 1/2 5 1/2 93 5/16
H42481991 2 Door Hatch 42 x 48 42 x 58 56 1/2 x 66 1/2 5 1/2 87 1/4
H48481991 2 Door Hatch 48 x 48 48 x 58 62 1/2 x 66 1/2 5 1/2 91 1/4
H48541991 2 Door Hatch 48 x 54 48 x 64 62 1/2 x 72 1/2 5 1/2 95 3/4
H48721991 2 Door Hatch 48 x 72 48 x 82 62 1/2 x 90 1/2 5 1/2 110
H60601991 2 Door Hatch 60 x 60 60 x 70 74 1/2 x 78 1/2 5 1/2 108 1/4
H48601991 2 Door Hatch 48 x 60 48 x 70 62 1/2 x 78 1/2 5 1/2 100 5/16
H60721991 2 Door Hatch 60 x 72 60 x 82 74 1/2 x 90 1/2 5 1/2 117 1/4
Note: All dimensions are in inches.
CHS Series with SAFE HATCH® Safety Grate System
Catalog Number Description Unobstructed Clear Opening Dimensions Dimensions Height Diagonal
Aluminum O x O1 A x A1 B x B1 C D
H24241891 1 Door Hatch 24 x 24 24 x 24 38 1/2 x 32 1/2 5 1/2 50 3/8
H24301891 1 Door Hatch 24 x 30 24 x 30 38 1/2 x 38 1/2 5 1/2 54 7/16
H24361891 1 Door Hatch 24 x 36 24 x 36 38 1/2 x 44 1/2 5 1/2 58 13/16
H30301891 1 Door Hatch 30 x 30 30 x 30 44 1/2 x 38 1/2 5 1/2 58 13/16
H30361891 1 Door Hatch 30 x 36 30 x 36 44 1/2 x 44 1/2 5 1/2 62 15/16
H30481891 1 Door Hatch 30 x 48 30 x 48 46 1/2 x 56 1/2 5 1/2 73 3/16
H36361891 1 Door Hatch 36 x 36 36 x 36 52 1/2 x 44 1/2 5 1/2 68 13/16
H36481891 1 Door Hatch 36 x 48 36 x 48 52 1/2 x 56 1/2 5 1/2 77 1/8
H42421891 1 Door Hatch 42 x 42 42 x 42 58 1/2 x 50 1/2 5 1/2 77 5/16
Double Grate, Double Cover Style
Single Grate, Single Cover Style
Double Grate, Double Cover Style
21
Access Hatch Solutions
ejco.com 800 626 4653
Infill Doors
INFILL FLOOR DOORS
Infill Floor Doors
Part number Clear open Outside dimension Infill depth Infill material
H24241619 24" x 24" (610 x 610 mm)32 1/2" (826 mm) square 1" (25 mm)Pavers or Concrete
H30301614 30" x 30" (762 x 762 mm)38 1/2" (978 mm) square 1" (25 mm)Pavers or Concrete
H30365007 30" x 36" (762 x 914 mm)38" x 44" (965 x 1118 mm)2" (51 mm)Concrete
H36601712 36" x 60" (914 x 1524 mm)44 1/2" x 68 1/2" (1130 x 1740 mm)1 1/2" (38 mm)Pavers or Concrete
H36721706 36" x 72" (914 x 1829 mm)44 1/2" x 80 1/2" (1130 x 2045 mm)1 1/2" (38 mm)Pavers or Concrete
Infill floor doors by EJ provide
a sturdy, durable way to seamlessly
integrate your paver or concrete design
across the site. Maintain the flow and
identity of streetscapes, campus, or park
landscapes. Infill hatches accommodate
pavers of varying heights or concrete to
match your creativity.
Like the outstanding quality and longevity of
non-traffic aluminum hatches by EJ, our infill
hatches utilize superior grade stainless steel
hardware and epoxy coatings that provide
extra protection from corrosion.
With a variety of security locking options,
you can be sure that your underground
infrastructure will remain undisturbed.
The smooth and durable pneu-spring lift
assist enables easy opening. The hold open
arm or optional safety grate ensures safe
working conditions.
Infill hatches are currently available in a
variety of sizes.
22
Access Hatch Solutions
ejco.com 800 626 4653
DUCTILE IRON HINGED HATCH
ACCESS ASSEMBLY
8197 grate option
36" x 36"
Ductile Hinged Hatch Clear Opening Options
Clear
Opening Size
Airport Extra Heavy
Duty Series No.
Heavy Duty
Series No.
24 x 24 8195 8215
24 x 36 8192 8212
30 x 30 8196 8216
30 x 62 8196—Double 8216—Double
36 x 36 8197 8217
36 x 74 —8217—Double
48 x 48 8198 —
48 x 48 —8218—Double
Note: All dimensions are in inches.
Ductile iron access hatches have been
designed for improved ergonomics, and are
available in heavy duty and airport extra
heavy duty applications.
On a cover that can weigh as much as
550 lbs, the lifting force required to open the
cover is less than 35 lbs due to the uniquely
designed mechanical strut.
The self-engaging safety bar provides added
protection while the underground
infrastructure is accessed, and safety grates
can be specified for added fall through
protection.
Features
·Ductile iron frame and cover
·Cover opens to 105°, safety catch and
removal at 90°
·Self-engaging safety bar
·EON LOCK®
·MPIC® multi-tool pick bar
·Bolting
Options
·Mechanical lift assist (standard feature for
airport rated models)
·Top and bottom flange designs
·Safety grate
·INFRA-RISER® adjustment riser
·Forming skirt (see page 24)
8196 double assembly
30" x 62"
8192 hinged hatch
24" x 36"
8198 hinged hatch
with dual lift assist
48" x 48"
Wide Availability of Sizes
Shown below are just a sample of the various cover openings and sizes. See the table below for the full range of
available clear opening sizes and load ratings.
8218 double assembly
48" x 48"
Ductile Iron Hinged Hatch Access Assembly
23
Access Hatch Solutions
ejco.com 800 626 4653
Lift Assist
Lift Assist is a corrosion-resistant stainless steel
mechanical spring strut. The rugged design is clean
and maintenance free. The strut takes up less space in
the clear opening than a traditional spring assist. It is
fully self-contained, protecting coils from exposure to
the elements.
Made without internal gases or seals, the struts have
an effective operating temperature range of -30° F to
400° F. The durability has been tested at over 150,000
cycles.
Patented
Self-engaging
Safety Bar
Security cam lock and wrench shown. Wrench is only
removable when cover is in the locked position.
Neoprene gasket for
water resistance and
sound dampening
Cavity and rubber plug
retain the nut when
unbolted, eliminating the
need to drill and tap the
frame
Top flange frame
Removable center beam provides a much greater clear opening access on several
double hatch models. Removal/replacement is simple with 4 bolts securing the
beam to the frame.
EON LOCK®
Removable Center Beam
Optional Safety Grate
Provides additional safety features
·Doors cannot be closed unless the fall through protection has been put back in
place (protecting the next operator).
·Visual inspections and limited main tenance can be done while safety grate is left
in place.
·Orange safety grates create a visual barrier around the pit; an orange epoxy
coating promotes an awareness of the hazard and provides a durable finish.
·Grate can be locked independently of the hatch, adding another level of security
when needed.
Visit our YouTube
Channel for videos on
this and other products at
www.youtube.com/
AccessInfrastructure
Frame Options
Bottom flange frame
Optional Cam Lock
Ductile Iron Hinged Hatch Access Assembly
24
Access Hatch Solutions
ejco.com 800 626 4653
Forming Skirts
FORMING SKIRTS
EJ custom fabricated, leave-in-place
aluminum forming skirt system works with
aluminum or ductile iron hatch lines to create
a frame height that matches any concrete
top slab thickness. Precasters and general
contractors can eliminate the time and
material consuming operations of building
and removing temporary frames. These
fabricated skirts integrate to allow “set and
pour” ease of installation.
Benefits
·Custom sizes–any height can be
accommodated
·Reduce time and labor costs:
·No need to build a “temporary” frame
·Leave-in-place form–eliminates the need
to remove form after concrete pour
·Works with optional integrated
SAFEHATCH® Safety Grate System
creating a complete solution for high density
traffic applications
·Creates a smooth interior opening
Set the hatch with integrated custom skirt in place, pour concrete and you’re done. Reduce your cost of labor,
time, and materials, and increase your production rate.
Available for aluminum and ductile iron hatch
assemblies.
Set and Pour with Ease
25
Access Hatch Solutions
ejco.com 800 626 4653
ERMATIC®
MODULAR COVERS
Removable beams give unobstructed access to
large vaults.
Modular design allows for infinite length to
accommodate even the longest duct systems.
Modular Construction—The use of modular elements gives a vast range of sizes. Frame elements (side frames
and end plates) are assembled using bolts and aluminium joints to provide linear openings for even the longest
ducts. Above clear opening spans of 47 3/16" (1200 mm), ERMATIC units use removable beams supported in
boxes which are fixed to the frames. This allows the construction of units to suit the largest openings.
The ERMATIC Modular Cover system is a
comprehensive and highly engineered range
of access covers for a wide variety of
underground services. This modular system
can be customized to fit any underground
vault dimension or cover configuration. The
ERMATIC range leverages the global
engineering and design experience within
EJ, to enhance ergonomic design and
security.
Features/Options
·Pedestrian to airport rated (or EN124
Standards – B125, C250, D400, E600, F900)
·Wide range of cover sizes from 24" x 24"
and larger
·Water resistant
·Security locking
·Available with hinged and spring loaded
struts for assisted opening
·Ergonomic lift handles for opening
·Available with safety grates and/or
safety railings
·Cover options: solid cover with LLLL® slip
resistant tread, recessed for concrete infill or
brick pavers, or cover with removable inner
hatch/cover
·Available with PREMARK® anti-skid coating
Project Applications
·Sewerage: inspection pits for sludge
chambers, access shafts for large
plants, etc.
·Telecommunications: cable jointing
chambers, etc.
·Utility: lighting, signals, transformer pits,
cable joint boxes, etc.
Project Types
·Airports and ports
·Railways
·Tunnels
·Power stations
·Water treatment and purification plants
·Manufacturing plants
·Exhibition centers, leisure parks, stadiums,
and other public arenas
Ultimate Protection
ERMATIC products assure protection against damage, debris or aggressive chemicals, and
allow designers to conceal underground services.
1/2/3 covers unit Continuous duct cover
The ERMATIC range of modular covers are
produced in France.
ERMATIC Modular Covers
26
Access Hatch Solutions
ejco.com 800 626 4653
We Are EJ
EJ is the leader in the design, manufacture
and distribution of access solutions for
water, sewer, drainage, telecommunications
and utility networks worldwide.
EJ offers the broadest range of high-quality
infrastructure access solutions. Our
distribution coverage continues to expand
into new markets. As an entrepreneurial
family-owned company, we have a long,
successful heritage of meeting change
with innovation.
Since our founding in 1883, we have grown
by providing access solutions to meet the
demands of the world’s growing
infrastructure. Fueled by innovation, our
design, manufacturing, and distribution
processes continue to evolve—creating
solutions that provide an unparalleled
customer experience.
Product Range
EJ offers a comprehensive portfolio of
products and services, including municipal
and construction castings, fabricated
products, water distribution solutions, and
other infrastructure access solutions.
Quality Manufacturing
Integrating technology, lean processes and
over a century of experience in crafting
metal castings and fabrications, keeps our
facilities performing at peak efficiencies.
Distribution Network
Access solution products, including
municipal and construction castings, are
available worldwide at our internal stocking
locations and from our extensive network of
distribution partners.
EJ is a family-owned company that has a long history of fostering strong customer
relationships. These relationships are supported with personal contact from company
representatives, a complete offering of product literature, a comprehensive web site
(ejco.com), trade show exhibits, as well as seminars and training opportunities. All
these services help to provide customers with the product information required for
successful projects.
Wherever you are, EJ provides access solutions that adhere to the local specifications in a
timely and competitive manner. We also work with our customers to produce access
solutions to meet their specialized requirements. Our sales staff around the world
understand the unique needs of your market.
Our people: our core strength. While working together, employees use their expertise,
knowledge, and ability to achieve positive results. Core values at EJ include safety and
security, honesty and integrity, environmental responsibility, respect for others, quality and
excellence, and social responsibility. These core values are imbedded into our culture and
are practiced daily throughout the organization.
Our state-of-the-art manufacturing plants employ world class machinery, systems, and
processes to produce specified products efficiently and on time.
Wherever you are, whatever your specific requirement might be, EJ has the best access
solutions for your infrastructure project.
27
Access Hatch Solutions Name of Catalog Section (if necessary)
ejco.com 800 626 4653
Americas
800 626 4653
231 536 2261
EMEA
Europe, Middle East
and Africa
+33 (0)344 08 28 00
Asia-Pacific
+61 (0)7 3216 5000
ejco.com
800 626 4653
EJ
301 Spring Street
PO Box 439
East Jordan, MI 49727
800 626 4653
231 536 2261
us.sales@ejco.com
Registered Mark(s)
HATCH US 0316Copyright © 2016 EJ Group, Inc. All rights reserved.
18396.003.TIR.doc
4.5 Water Quality System
Water Quality Facilities proposed for the project will be sized in accordance with the 2017
RSWDM for providing Basic Water Quality Treatment. A single water quality facility is being
proposed and is located within Tract A. Basic water quality will be provided with a StormFilter.
StormFilter has been approved for Basin Water Quality through Washington State Department of
Ecology GULD. The Detention Vault is upstream of the StormFilter and acts as pretreatment for
the water quality facility. Per the RSWDM the StormFilter has been sized to treat the combined
2-year release rate from the Detention Vault (0.35 CFS). The StormFilter vault is fitted with a weir
to bypass the flows higher than the 2-year flows up to the unmitigated 100-year release rate of
7.43 CFS. The basin breakdown is as follows:
Detention Vault
Impervious Pervious Total Area
4.66 Ac(1)(3)(4) 8.36 Ac(2)(3)(4)(5) 13.02 Ac
Notes:
6. Roads and Sidewalks = 2.00 Ac
Lot Area @ 4000 sf per lot = 2.30 Ac
Tract A = 0.01 Ac
7. Modeled as till grass = 5.75 Ac
Flat = 3.49 Ac
Mod = 2.26 Ac
8. Modeled as forested = 2.26 Ac
Mod = 2.26 Ac
9. Mitigation Trade
Modeled Impervious = 0.31 Ac
Modeled as Lawn = 0.9 AC
10. Bypass
Modeled Impervious = 0.04 Ac
Modeled as Lawn = 0.35 AC
The mitigation trade satisfies the water quality requirement for 0.31 acres of the total 0.35 acres
of impervious area not tributary to the proposed Stormfilter Vault. The remaining 1,900 sf (0.04
ac) threshold discharge area is less than 5,000 sf of pollution-generating impervious surface
allowed bypassing the site, set forth in core requirement #8 per the 2017 RSWDM.
The GULD sizing information for StormFilter has been included within this section. Detailed
sizing of the StormFilter is provide with in this section.
SECTION 6.1 WATER QUALITY MENUS
12/12/2016 2017 City of Renton Surface Water Design Manual 6-4
FIGURE 6.1.A WATER QUALITY TREATMENT FACILITY SELECTION FLOW CHART
FIG4.5.1
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 1
April 2017
GENERAL USE LEVEL DESIGNATION FOR BASIC (TSS) TREATMENT
For
CONTECH Engineered Solutions
Stormwater Management StormFilter®
With ZPG Media at 1 gpm/sq ft media surface area
Ecology’s Decision:
Based on the CONTECH Engineered Solutions’ (CONTECH) application
submissions, Ecology hereby issues a General Use Level Designation (GULD) for the
Stormwater Management StormFilter® (StormFilter):
1. As a basic stormwater treatment practice for total suspended solids (TSS)
removal,
Using ZPG™ media (zeolite/perlite/granular activated carbon), with the size
distribution described below,
Sized at a hydraulic loading rate of 1 gpm/ft2 of media surface area, per
Table 1, and
Internal bypassing needs to be consistent with the design guidelines in
CONTECH’s current product design manual.
Table 1. StormFilter Design Flow Rates per Cartridge
2. Ecology approves StormFilter systems containing ZPG™ media for treatment at
the hydraulic loading rates shown in Table 1, and sized based on the water
quality design flow rate for an off-line system. Contech designs their StormFilter
systems to maintain treatment of the water quality design flow while routing
excess flows around the treatment chamber during periods of peak bypass. The
water quality design flow rates are calculated using the following procedures:
Western Washington: For treatment installed upstream of detention or
retention, the water quality design flow rate is the peak 15-minute flow rate
as calculated using the latest version of the Western Washington Hydrology
Model or other Ecology-approved continuous runoff model.
Effective Cartridge Height (inches) 12 18 27
Cartridge Flow Rate (gpm/cartridge) 5 7.5 11.3
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 2
Eastern Washington: For treatment installed upstream of detention or
retention, the water quality design flow rate is the peak 15-minute flow rate
as calculated using one of the three methods described in Chapter 2.2.5 of the
Stormwater Management Manual for Eastern Washington (SWMMEW) or
local manual.
Entire State: For treatment installed downstream of detention, the water
quality design flow rate is the full 2-year release rate of the detention facility.
3. This designation has no expiration date, but Ecology may amend or revoke it.
Ecology’s Conditions of Use:
The StormFilter with ZPG media shall comply with the following conditions:
1. Design, install, operate, and maintain the StormFilter with ZPG media in
accordance with applicable Contech Engineered Solutions manuals,
documents, and the Ecology Decision.
2. Install StormFilter systems to bypass flows exceeding the water quality
treatment rate. Additionally, high flows will not re-suspend captured
sediments. Design StormFilter systems in accordance with the performance
goals in Ecology's most recent Stormwater Manual and CONTECH’s
Product Design Manual Version 4.1 (April 2006), or most current version,
unless otherwise specified.
3. Owners must follow the design, pretreatment, land use application, and
maintenance criteria in CONTECH’s Design Manual.
4. Pretreatment of TSS and oil and grease may be necessary, and designers
shall provide pre-treatment in accordance with the most current versions of
the CONTECH’s Product Design Manual (April 2006) or the applicable
Ecology Stormwater Manual. Design pre-treatment using the performance
criteria and pretreatment practices provided on Ecology’s “Evaluation of
Emerging Stormwater Treatment Technologies” website.
5. Maintenance: The required maintenance interval for stormwater treatment
devices is often dependent upon the degree of pollutant loading from a
particular drainage basin. Therefore, Ecology does not endorse or
recommend a “one size fits all” maintenance cycle for a particular model/size
of manufactured filter treatment device.
Typically, CONTECH designs StormFilter systems for a target filter
media replacement interval of 12 months. Maintenance includes
removing accumulated sediment from the vault, and replacing spent
cartridges with recharged cartridges.
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 3
Indications of the need for maintenance include effluent flow decreasing
to below the design flow rate, as indicated by the scumline above the
shoulder of the cartridge.
Owners/operators must inspect StormFilter with ZPG media for a
minimum of twelve months from the start of post-construction operation
to determine site-specific maintenance schedules and requirements. You
must conduct inspections monthly during the wet season, and every other
month during the dry season. (According to the SWMMWW, the wet
season in western Washington is October 1 to April 30. According to
SWMMEW, the wet season in eastern Washington is October 1 to June
30). After the first year of operation, owners/operators must conduct
inspections based on the findings during the first year of inspections.
Conduct inspections by qualified personnel, follow manufacturer’s
guidelines, and use methods capable of determining either a decrease in
treated effluent flowrate and/or a decrease in pollutant removal ability.
When inspections are performed, the following findings typically serve as
maintenance triggers:
Accumulated vault sediment depths exceed an average of 2 inches, or
Accumulated sediment depths on the tops of the cartridges exceed an
average of 0.5 inches, or
Standing water remains in the vault between rain events, or
Bypass occurs during storms smaller than the design storm.
Note: If excessive floatables (trash and debris) are present, perform a
minor maintenance consisting of gross solids removal, not cartridge
replacement.
6. CONTECH shall maintain readily available reports listed under
“Application Documents” (above) as public, as well as the documentation
submitted with its previous conditional use designation application.
CONTECH shall provide links to this information from its corporate
website, and make this information available upon request, at no cost and in
a timely manner.
7. ZPG™ media used shall conform with the following specifications:
Each cartridge contains a total of approximately 2.6 cubic feet of media.
The ZPG™ cartridge consists of an outer layer of perlite that is
approximately 1.3 cubic feet in volume and an inner layer, consisting of a
mixture of 90% zeolite and 10% granular activated carbon, which is
approximately 1.3 cubic feet in volume.
Perlite Media: Perlite media shall be made of natural siliceous volcanic
rock free of any debris or foreign matter. The expanded perlite shall
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 4
have a bulk density ranging from 6.5 to 8.5 lbs per cubic foot and particle
sizes ranging from 0.09” (#8 mesh) to 0.38” (3/8” mesh).
Zeolite Media: Zeolite media shall be made of naturally occurring
clinoptilolite. The zeolite media shall have a bulk density ranging from
44 to 50 lbs per cubic foot and particle sizes ranging from 0.13” (#6 mesh)
to 0.19” (#4 mesh). Additionally, the cation exchange capacity (CEC) of
zeolite shall range from approximately 1.0 to 2.2 meq/g.
Granular Activated Carbon: Granular activated carbon (GAC) shall be
made of lignite coal that has been steam-activated. The GAC media shall
have a bulk density ranging from 28 to 31 lbs per cubic foot and particle
sizes ranging from a 0.09” (#8 mesh) to 0.19” (#4 mesh).
Approved Alternate Configurations
Peak Diversion StormFilter
1. The Peak Diversion StormFilter allows for off-line bypass within the StormFilter
structure. Design capture flows and peak flows enter the inlet bay which contains an
internal weir. The internal weir allows design flows to enter the cartridge bay through
a transfer hole located at the bottom of the inlet bay while the unit routs higher flows
around the cartridge bay.
2. To select the size of the Peak Diversion StormFilter unit, the designer must determine
the number of cartridges required and size of the standard StormFilter using the site-
specific water quality design flow and the StormFilter Design Flow Rates per
Cartridge as described above.
3. New owners may not install the Peak Diversion StormFilter at an elevation or in a
location where backwatering may occur.
Applicant: Contech Engineered Solutions
Applicant’s Address: 11835 NE Glenn Widing Dr.
Portland, OR 97220
Application Documents:
The applicant’s master report, titled, “The Stormwater Management StormFilter
Basic Treatment Application for General Use Level Designation in Washington”,
Stormwater Management, Inc., November 1, 2004, includes the following reports:
(Public) Evaluation of the Stormwater Management StormFilter Treatment
System: Data Validation Report and Summary of the Technical Evaluation
Engineering Report (TEER) by Stormwater Management Inc., October 29, 2004
Ecology’s technology assessment protocol requires the applicant to hire an
independent consultant to complete the following work:
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 5
1. Complete the data validation report.
2. Prepare a TEER summary, including a testing summary and conclusions
compared with the supplier’s performance claims.
3. Provide a recommendation of the appropriate technology use level.
4. Work with Ecology to post recommend relevant information on Ecology’s
website.
5. Provide additional testing recommendations, if needed.”
6. This report, authored by Dr. Gary Minton, Ph. D., P.E., Resource Planning
Associates, satisfies the Ecology requirement.
(Public) “Performance of the Stormwater Management StormFilter Relative to the
Washington State Department of Ecology Performance Goals for Basic
Treatment,” is a summary of StormFilter performance that strictly adheres to the
criteria listed in the Guidance for Evaluating Emerging Stormwater Treatment
Technologies, Technology Assessment Protocol – Ecology (TAPE).
“Heritage Marketplace Field Evaluation: Stormwater Management StormFilter
with ZPG™ Media,” is a report showing all of the information collected at Site A
as stated in the SMI Quality Assurance Project Plan (QAPP). This document
contains detailed information regarding each storm event collected at this site, and
it provided a detailed overview of the data and project.
“Lake Stevens Field Evaluation: Stormwater Management StormFilter with
ZPG™ Media,” is a report that corresponds to Site E as stated in the SMI QAPP.
This document contains detailed information regarding each storm collected at
this site, and includes a detailed overview of the data and project.
(Public) “Evaluation of the Stormwater Management StormFilter for the removal
of SIL-CO-SIL 106, a standardized silica product: ZPG™ at 7.5 GPM” is a report
that describes laboratory testing at full design flow.
“Factors Other Than Treatment Performance.”
“State of Washington Installations.”
“Peak Diversion StormFilter” is a technical document demonstrating the Peak
Diversion StormFilter system complies with the Stormwater Management Manual
for Western Washington Volume V Section 4.5.1.
Above-listed documents noted as “public” are available by contacting CONTECH.
Applicant's Use Level Request:
That Ecology grant a General Use Level Designation for Basic Treatment for the
StormFilter using ZPG™ media (zeolite/perlite/granular activated carbon) at a hydraulic
loading rate of 1 gpm/ft2 of media surface area in accordance with Ecology's 2011
Technical Guidance Manual for Evaluating Emerging Stormwater Treatment
Technologies Technology Assessment Protocol – Ecology (TAPE).
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 6
Applicant's Performance Claim:
The combined data from the two field sites reported in the TER (Heritage Marketplace
and Lake Stevens) indicate that the performance of a StormFilter system configured for
inline bypass with ZPG™ media and a hydraulic loading rate of 1 gpm/ft2 of media
surface area meets Ecology performance goals for Basic Treatment.
Ecology’s Recommendations:
Based on the weight of the evidence and using its best professional judgment, Ecology
finds that:
StormFilter, using ZPG™ media and operating at a hydraulic loading rate of no more
than 1 gpm/ft2 of media surface area, is expected to provide effective stormwater
treatment achieving Ecology’s Basic Treatment (TSS removal) performance goals.
Contech demonstrated this is through field and laboratory testing performed in
accordance with the approved protocol. StormFilter is deemed satisfactory with
respect to factors other than treatment performance (e.g., maintenance; see the
protocol’s Appendix B for complete list).
Findings of Fact:
Influent TSS concentrations and particle size distributions were generally within the
range of what Ecology considers “typical” for western Washington (silt-to-silt loam).
Contech sampled thirty-two (32) storm events at two sites for storms from April 2003
to March 2004, of which Contech deemed twenty-two (22) as “qualified” and were
therefore included in the data analysis set.
Statistical analysis of these 22 storm events verifies the data set’s adequacy.
Analyzing all 22 qualifying events, the average influent and effluent concentrations
and aggregate pollutant load reduction are 114 mg/L, 25 mg/L, and 82%,
respectively.
Analyzing all 22 qualifying events based on the estimated average flow rate during
the event (versus the measured peak flow rate), and more heavily weighting those
events near the design rate (versus events either far above or well below the design
rate) does not significantly affect the reported results.
For the 7 qualifying events with influent TSS concentrations greater than 100 mg/L,
the average influent and effluent concentrations and aggregate pollutant load
reduction are 241 mg/L, 34 mg/L, and 89%, respectively. If we exclude the 2 of 7
events that exceed the maximum 300 mg/L specified in Ecology’s guidelines, the
average influent and effluent concentrations and aggregate pollutant load reduction
are 158 mg/L, 35 mg/L, and 78%, respectively.
For the 15 qualifying events with influent TSS concentrations less than 100 mg/L, the
average influent and effluent concentrations and aggregate pollutant load reduction
are 55 mg/L, 20 mg/L, and 61%, respectively. If the 6 of 15 events that fall below the
minimum 33 mg/L TSS specified in Ecology’s guidelines are excluded, the average
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 7
influent and effluent concentrations and aggregate pollutant load reduction are 78
mg/L, 26 mg/L, and 67%, respectively.
For the 8 qualifying events with peak discharge exceeding design flow (ranging from
120 to 257% of the design rate), results ranged from 52% to 96% TSS removal, with
an average of 72%.
Due to the characteristics of the hydrographs, the field results generally reflect flows
below (ranging between 20 and 60 percent of) the tested facilities’ design rate.
During these sub-design flow rate periods, some of the cartridges operate at or near
their individual full design flow rate (generally between 4 and 7.5 GPM for an 18”
cartridge effective height) because their float valves have opened. Float valves
remain closed on the remaining cartridges, which operate at their base “trickle” rate
of 1 to 1.5 GPM.
Laboratory testing using U.S. Silica’s Sil-Co-Sil 106 fine silica product showed an
average 87% TSS removal for testing at 7.5 GPM per cartridge (100% design flow
rate).
Other relevant testing at I-5 Lake Union, Greenville Yards (New Jersey), and Ski Run
Marina (Lake Tahoe) facilities shows consistent TSS removals in the 75 to 85%
range. Note that the evaluators operated the I-5 Lake Union at 50%, 100%, and
125% of design flow.
SMI’s application included a satisfactory “Factors other than treatment performance”
discussion.
Note: Ecology’s 80% TSS removal goal applies to 100 mg/l and greater influent TSS.
Below 100 mg/L influent TSS, the goal is 20 mg/L effluent TSS.
Technology Description:
The Stormwater Management StormFilter® (StormFilter), a flow-through stormwater
filtration system, improves the quality of stormwater runoff from the urban environment
by removing pollutants. The StormFilter can treat runoff from a wide variety of sites
including, but not limited to: retail and commercial development, residential streets,
urban roadways, freeways, and industrial sites such as shipyards, foundries, etc.
Operation:
The StormFilter is typically comprised of a vault that houses rechargeable, media-filled,
filter cartridges. Various media may be used, but this designation covers only the zeolite-
perlite-granulated activated carbon (ZPG™) medium. Stormwater from storm drains
percolates through these media-filled cartridges, which trap particulates and may remove
pollutants such as dissolved metals, nutrients, and hydrocarbons. During the filtering
process, the StormFilter system also removes surface scum and floating oil and grease.
Once filtered through the media, the treated stormwater is directed to a collection pipe or
discharged to an open channel drainage way.
This document includes a bypass schematic for flow rates exceeding the water quality
design flow rate on page 8.
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 8
StormFilter Configurations:
Contech offers the StormFilter in multiple configurations: precast, high flow, catch basin,
curb inlet, linear, volume, corrugated metal pipe, drywell, and CON/Span form. Most
configurations use pre-manufactured units to ease the design and installation process.
Systems may be either uncovered or covered underground units.
The typical precast StormFilter unit is composed of three sections: the energy dissipater,
the filtration bay, and the outlet sump. As Stormwater enters the inlet of the StormFilter
vault through the inlet pipe, piping directs stormwater through the energy dissipater into
the filtration bay where treatment will take place. Once in the filtration bay, the
stormwater ponds and percolates horizontally through the media contained in the
StormFilter cartridges. After passing through the media, the treated water in each
cartridge collects in the cartridge’s center tube from where piping directs it into the outlet
sump by a High Flow Conduit under-drain manifold. The treated water in the outlet
sump discharges through the single outlet pipe to a collection pipe or to an open channel
drainage way. In some applications where you anticipate heavy grit loads, pretreatment
by settling may be necessary.
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 9
Figure 1. Stormwater Management StormFilter Configuration with Bypass
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 10
Figure 2. The StormFilter Cartridge
Cartridge Operation:
As the water level in the filtration bay begins to rise, stormwater enters the StormFilter
cartridge. Stormwater in the cartridge percolates horizontally through the filter media
and passes into the cartridge’s center tube, where the float in the cartridge is in a closed
(downward) position. As the water level in the filtration bay continues to rise, more
water passes through the filter media and into the cartridge’s center tube. Water
displaces the air in the cartridge and it purges from beneath the filter hood through the
one-way check valve located in the cap. Once water fills the center tube there is enough
buoyant force on the float to open the float valve and allow the treated water to flow into
the under-drain manifold. As the treated water drains, it tries to pull in air behind it. This
causes the check valve to close, initiating a siphon that draws polluted water throughout
the full surface area and volume of the filter. Thus, water filters through the entire filter
cartridge throughout the duration of the storm, regardless of the water surface elevation in
the filtration bay. This continues until the water surface elevation drops to the elevation
of the scrubbing regulators. At this point, the siphon begins to break and air quickly
flows beneath the hood through the scrubbing regulators, causing energetic bubbling
between the inner surface of the hood and the outer surface of the filter. This bubbling
agitates and cleans the surface of the filter, releasing accumulated sediments on the
surface, flushing them from beneath the hood, and allowing them to settle to the vault
floor.
Adjustable cartridge flow rate:
Inherent to the design of the StormFilter is the ability to control the individual cartridge
flow rate with an orifice-control disc placed at the base of the cartridge. Depending on
the treatment requirements and on the pollutant characteristics of the influent stream as
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 11
specified in the CONTECH Product Design Manual, operators may adjust the flow rate
through the filter cartridges. By decreasing the flow rate through the filter cartridges, the
influent contact time with the media is increased and the water velocity through the
system is decreased, thus increasing both the level of treatment and the solids removal
efficiencies of the filters, respectively (de Ridder, 2002).
Recommended research and development:
Ecology encourages CONTECH to pursue continuous improvements to the StormFilter.
To that end, CONTECH recommends the following actions:
Determine, through laboratory testing, the relationship between accumulated solids
and flow rate through the cartridge containing the ZPG™ media. Completed 11/05.
Determine the system’s capabilities to meet Ecology’s enhanced, phosphorus, and oil
treatment goals.
Develop easy-to-implement methods of determining that a StormFilter facility
requires maintenance (cleaning and filter replacement).
Contact Information:
Applicant Contact: Jeremiah Lehman
Contech Engineered Solutions
11835 NE Glenn Widing Drive
Portland, OR, 97220
503-258-3136
jlehman@conteches.com
Applicant Web link http://www.conteches.com/
CONTECH - StormFilter® GULD Maintenance Update (November 2012) P a g e | 12
Ecology web link: http://www.ecy.wa.gov/programs/wq/stormwater/newtech/index.html
Ecology Contact: Douglas C. Howie, P.E.
Department of Ecology
Water Quality Program
(360) 407-6444
douglas.howie@ecy.wa.gov
Revision History
Date Revision
Jan 2005 Original Use Level Designation
Dec 2007 Revision
May 2012 Maintenance requirements updated
November 2012 Design Storm and Maintenance requirements updated
January 2013 Updated format to match Ecology standard format
September 2014 Added Peak Diversion StormFilter Alternate Configuration
November 2016 Revised Contech contact information
April 2017 Revised sizing language to note sizing based on Off-line
calculations
Tab 5.0
18396.003.TIR.doc
5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN
The on-site conveyance system will be designed in accordance with the 2017 RSWDM. The
proposed conveyance system for this project is curb, gutter, catch basins, and storm drainage
pipe. The storm drainage pipe used will consist of smooth-walled corrugated polyethylene pipe
with a Manning's roughness coefficient of 0.014.
100-year conveyance calculations for the pipes will be completed using the rational method. The
design intent of the conveyance system is to fully accommodate the 100-year storm event flowing
at full condition. Please see Figure 5.0.1 Conveyance Analysis provided below.
A 100-year backwater analysis to determine the hydraulic grade line and to see if any catch basin
rims overtop has also been performed using KCBW in accordance with the 2017 City of Renton
Amendments to the KCSWDM. Please see Figure 5.0.2 Backwater Analysis in this section.
See Figure 5.0.3 CB#46 Upstream Bypass Runoff for more detail on berm design for CB#46.
See Figure 5.0.4 CB#4A Perkins Runoff for more detail on berm design for CB#4A.
Conveyance Analysis5.0.1
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLATPULTE GROUP, INC3535 FACTORIA BLVD S.E., #600BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000813/10/2020
FOREST TERRACE PLAT
SCALE: 1"=50'
CATCHMENT AREAS = Onsite
Impervious C=0.90
Pervious C=0.25
Forest C=0.10
Catch Basin No.Impervious Area
(SF)
Pervious Area
(SF)
Forested Area
(SF)
Tributary Area
(SF)
Tributary Area
(AC)Weighted C
CB#31 2,624 5,598 0 5,423 0.12 0.69
CB#30 4,310 0 0 4,310 0.10 0.90
CB#27 2,295 11,704 0 13,999 0.32 0.36
CB#26 0 0 0 0 0.00
CB#25 8,686 1,605 0 10,291 0.24 0.80
CB#23 4,038 0 0 4,038 0.09 0.90
CB#22 3,510 0 0 3,510 0.08 0.90
CB#21 18,651 12,149 0 30,800 0.71 0.64
CB#20 7,312 0 0 7,312 0.17 0.90
CB#19 0 0 0 0 0.00
CB#18 2,205 0 0 2,205 0.05 0.90
CB#17 16,777 12,377 0 29,154 0.67 0.62
CB#16 0 0 0 0 0.00
CB#15 28,882 24,584 0 53,466 1.23 0.60
CB#14 0 0 0 0 0.00
CB#13 0 0 0 0 0.00
CB#12 13,852 27,716 0 41,568 0.95 0.47
CB#11 2,227 38,269 63,792 104,288 2.39 0.17
CB#10 12,684 14,890 0 27,574 0.63
CB#9 0 0 0 0 0.00
CB#8 7,463 0 0 7,463 0.17 0.90
CB#7 0 0 0 0 0.00
CB#6 33,278 25,551 0 58,829 1.35 0.62
CB#5 21,297 19,662 0 40,959 0.94 0.59
CB#4 7,008 6,548 0 13,555 0.31 0.59
CB#3 6,400 33,551 40,446 80,397 1.85 0.23
CB#2 5,070 0 0 4,959 0.11 0.92
CB#1 0 0 0 0 0.00 0.00
AVERAGE 0.63
18396-kingco-OLYMPIC.xlsxBARGHAUSEN CONSULTING ENGINEERS - PIPE FLOW CALCULATORusing the Rational Method & Manning FormulaKING COUNTY DESIGN FOR 100YEAR STORMJOB NAME:FOREST TERRACE NOTE: ENTER DEFAULTS AND STORM DATA BEFORE BEGINNING JOB#:18396 DEFAULTS C=0.63n=0.014REVISED:11/3/2019 d=12Tc=6.3A= Contributing Area (Ac) Qd= Design Flow (cfs) COEFFICIENTS FOR THE RATIONAL METHOD "Ir"-EQUATIONC= Runoff Coefficient Qf= Full Capacity Flow (cfs)STORMAr BrTc= Time of Concentration (min) Vd= Velocity at Design Flow (fps)2YR 1.58 0.58I= Intensity at Tc (in/hr) Vf= Velocity at Full Flow (fps)10YR 2.44 0.64PRECIP=3.95d= Diameter of Pipe (in) s= Slope of pipe (%)25YR 2.66 0.65Ar=2.61L= Length of Pipe (ft) n= Manning Roughness Coefficient50YR 2.75 0.65Br=0.63D= Water Depth at Qd (in) Tt= Travel Time at Vd (min)100YR 2.61 0.63FROM TO A s Ld Tc n CSUM AA*CSUM A*C I Qd QfQd/QfD/d D Vf VdTt====== ====== ====== ====== ================== ====== ============ ===================== ====== ====== ====== ====== ====== ====== ============CB#15 CB#12 1.23 1.00 13812 6.7 0.014 0.631.230.770.77 3.11 2.41 3.310.7290.634 7.60 4.21 4.600.50CB#12 CB#11 0.95 0.50 7318 7.2 0.014 0.632.180.601.37 2.97 4.08 6.890.5920.553 9.95 3.90 4.060.30CB#11 CB#10 2.39 0.50 8324 7.5 0.014 0.634.571.512.88 2.90 8.34 14.850.5620.535 12.85 4.73 4.860.28CB#10 CB#8 0.63 0.50 14124 7.8 0.014 0.635.20.403.28 2.83 9.27 14.850.6240.582 13.96 4.73 5.020.47CB#8 CB#6 0.17 0.50 13124 8.3 0.014 0.635.370.113.38 2.73 9.23 14.850.6210.581 13.93 4.73 5.020.44CB#6 CB#5 1.35 0.50 11924 8.7 0.014 0.636.720.854.23 2.64 11.18 14.850.7530.647 15.54 4.73 5.200.38CB18 CB#17 0.05 11.61 4112 6.3 0.014 0.630.050.030.03 3.23 0.10 11.270.0090.063 0.76 14.36 4.290.16CB#17 CB#5 0.67 2.00 2912 6.5 0.014 0.630.720.420.45 3.18 1.44 4.680.3090.379 4.55 5.96 5.240.09CB#5 CB#4 0.94 1.00 17224 9.1 0.014 0.630.940.595.63 2.57 14.46 21.000.6890.609 14.62 6.69 7.200.40CB#4 CB#3 0.31 1.00 5424 9.5 0.014 0.631.250.205.82 2.50 14.57 21.000.6940.612 14.70 6.69 7.220.12CB#3 CB#2 1.85 2.50 2424 9.6 0.014 0.633.11.176.99 2.48 17.34 33.200.5220.513 12.30 10.58 10.700.04CB#21 CB#20 0.71 11.04 18112 6.3 0.014 0.630.710.450.45 3.23 1.45 10.990.1320.245 2.94 14.00 9.600.31CB#20 CB#22 0.17 5.10 5812 6.6 0.014 0.630.880.110.55 3.14 1.74 7.470.2330.326 3.91 9.52 7.740.12CB#22 CB#22A 0.08 3.95 9312 6.7 0.014 0.630.960.050.60 3.10 1.87 6.570.2850.366 4.39 8.38 7.220.21CB#22A CB#2 0.00 16.82 9812 7.0 0.014 0.630.960.000.60 3.04 1.84 13.560.1350.248 2.98 17.28 11.960.14CB#2 VAULT 0.11 2.60 6224 9.6 0.014 0.630.110.077.70 2.47 19.06 33.860.5630.536 12.86 10.79 11.080.09CB#31 CB#30 0.12 0.60 12312 6.3 0.014 0.630.120.080.08 3.23 0.24 2.560.0950.207 2.49 3.26 2.021.01CB#30 CB#28 0.10 0.60 612 7.3 0.014 0.630.220.060.14 2.94 0.41 2.560.1590.267 3.21 3.26 2.380.04CB#27 CB#26 0.32 0.88 3112 6.3 0.014 0.630.320.200.20 3.23 0.65 3.100.2100.308 3.70 3.95 3.110.17CB#26 CB#25 0.00 0.60 2412 6.5 0.014 0.630.320.000.20 3.18 0.64 2.560.2500.340 4.08 3.26 2.710.15CB#25 LEVEL B 0.24 3.68 3912 6.6 0.014 0.630.560.150.35 3.14 1.11 6.340.1740.280 3.35 8.08 6.060.11CB#46 CB#45 6.88 3.44 5418 3.0 0.014 0.246.881.651.65 5.16 8.52 18.080.4710.484 8.70 10.24 10.170.09CB#45 CB#44 0.00 5.00 5818 3.1 0.014 0.246.880.001.65 5.07 8.37 21.800.3840.429 7.72 12.35 11.530.08CB#44 CB#43 0.00 23.96 8018 3.2 0.014 0.636.880.001.65 4.98 8.23 47.730.1720.278 5.00 27.03 20.200.07CB#43 CB#42 - LEVEL 0.00 17.01 18518 3.2 0.014 0.636.880.001.65 4.92 8.12 40.210.2020.302 5.43 22.78 17.700.17Page 1
3.2.1 RATIONAL METHOD
2017 City of Renton Surface Water Design Manual 12/12/2016 3-17
FIGURE 3.2.1.D 100-YEAR 24-HOUR ISOPLUVIALS
SITE
Backwater Analysis5.0.2
BACKWATER COMPUTER PROGRAM FOR PIPES
Pipe data from file:18396p1.bwp
Surcharge condition at intermediate junctions
Tailwater Elevation:355.5 feet
Discharge Range:22.92 to 22.92 Step of 0.01 [cfs]
Overflow Elevation:376.82 feet
Weir:NONE
Upstream Velocity:1. feet/sec
PIPE NO. 1: 29 LF - 24"CP @ 2.45% OUTLET: 355.50 INLET: 356.21 INTYP: 5
JUNC NO. 1: OVERFLOW-EL: 374.54 BEND: 0 DEG DIA/WIDTH: 4.0 Q-RATIO: 0.13
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
22.92 2.87 359.08 * 0.012 1.71 1.12 0.00 1.12 1.71 ***** 2.87
PIPE NO. 2: 37 LF - 24"CP @ 2.43% OUTLET: 356.21 INLET: 357.11 INTYP: 5
JUNC NO. 2: OVERFLOW-EL: 376.01 BEND: 90 DEG DIA/WIDTH: 4.0 Q-RATIO: 0.01
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
20.28 3.18 360.29 * 0.012 1.62 1.04 2.87 2.87 1.62 ***** 3.18
PIPE NO. 3: 25 LF - 24"CP @ 2.44% OUTLET: 357.11 INLET: 357.72 INTYP: 5
JUNC NO. 3: OVERFLOW-EL: 376.01 BEND: 90 DEG DIA/WIDTH: 4.0 Q-RATIO: 0.19
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
20.08 3.91 361.63 * 0.012 1.61 1.03 3.18 3.18 2.75 3.91 3.15
PIPE NO. 4: 54 LF - 24"CP @ 1.00% OUTLET: 357.72 INLET: 358.26 INTYP: 5
JUNC NO. 4: OVERFLOW-EL: 374.63 BEND: 90 DEG DIA/WIDTH: 4.0 Q-RATIO: 0.02
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
16.88 4.45 362.71 * 0.012 1.49 1.22 3.91 3.91 3.63 4.45 2.62
PIPE NO. 5: 172 LF - 24"CP @ 1.00% OUTLET: 358.26 INLET: 359.98 INTYP: 5
JUNC NO. 5: OVERFLOW-EL: 370.41 BEND: 90 DEG DIA/WIDTH: 4.0 Q-RATIO: 0.32
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
16.55 4.30 364.28 * 0.012 1.47 1.21 4.45 4.45 3.52 4.30 2.57
PIPE NO. 6: 119 LF - 24"CP @ 0.50% OUTLET: 359.98 INLET: 360.57 INTYP: 5
JUNC NO. 6: OVERFLOW-EL: 369.36 BEND: 90 DEG DIA/WIDTH: 4.0 Q-RATIO: 0.20
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
12.53 4.48 365.05 * 0.012 1.28 1.27 4.30 4.30 4.03 4.48 2.05
CB#1 TO VAULT
CB#2 TO CB#1
CB#3 TO CB#2
CB#4 TO CB#3
CB#5 TO CB#4
CB#6 TO CB#5
PIPE NO. 7: 131 LF - 24"CP @ 0.50% OUTLET: 360.57 INLET: 361.23 INTYP: 5
JUNC NO. 7: OVERFLOW-EL: 371.30 BEND: 90 DEG DIA/WIDTH: 4.0 Q-RATIO: 0.23
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
10.45 4.38 365.61 * 0.012 1.16 1.12 4.48 4.48 4.07 4.38 1.79
PIPE NO. 8: 141 LF - 24"CP @ 0.50% OUTLET: 361.23 INLET: 361.93 INTYP: 5
JUNC NO. 8: OVERFLOW-EL: 373.77 BEND: 90 DEG DIA/WIDTH: 4.0 Q-RATIO: 0.02
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
8.49 4.15 366.08 * 0.012 1.04 1.00 4.38 4.38 3.86 4.15 1.63
PIPE NO. 9: 83 LF - 18"CP @ 0.51% OUTLET: 362.43 INLET: 362.85 INTYP: 5
JUNC NO. 9: OVERFLOW-EL: 372.35 BEND: 90 DEG DIA/WIDTH: 4.0 Q-RATIO: 1.05
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
8.33 4.26 367.11 * 0.012 1.12 1.28 3.65 3.65 3.67 4.26 1.95
PIPE NO.10: 72 LF - 18"CP @ 0.50% OUTLET: 362.85 INLET: 363.21 INTYP: 5
JUNC NO.10: OVERFLOW-EL: 372.29 BEND: 90 DEG DIA/WIDTH: 4.0 Q-RATIO: 0.70
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
4.06 4.23 367.44 * 0.012 0.78 0.76 4.26 4.26 4.00 4.23 1.23
PIPE NO.11: 138 LF - 12"CP @ 1.00% OUTLET: 363.71 INLET: 365.09 INTYP: 5
Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI
*******************************************************************************
2.39 3.09 368.18 * 0.012 0.67 0.57 3.73 3.73 2.89 3.09 1.02
CB#8 TO CB#6
CB#10 TO CB#8
CB#11 TO CB#10
CB#12 TO CB#11
CB#15 TO CB#12
CB#46 Upstream
Bypass Runoff
5.0.3
WWHM2012
PROJECT REPORT
FIG 5.0.3 - FOREST TERRACE CB#46
UPSTREAM BYPASS RUNOFF
18396-forest terrace-perkins 3/5/2020 9:30:37 AM Page 2
General Model Information
Project Name:18396-forest terrace-perkins
Site Name:
Site Address:
City:
Report Date:3/5/2020
Gage:Seatac
Data Start:1948/10/01
Data End:2009/09/30
Timestep:15 Minute
Precip Scale:0.000 (adjusted)
Version Date:2019/09/13
Version:4.2.17
POC Thresholds
Low Flow Threshold for POC1:50 Percent of the 2 Year
High Flow Threshold for POC1:50 Year
18396-forest terrace-perkins 3/5/2020 9:30:37 AM Page 3
Landuse Basin Data
Predeveloped Land Use
Basin 1
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Forest, Flat 0.72
Pervious Total 0.72
Impervious Land Use acre
Impervious Total 0
Basin Total 0.72
Element Flows To:
Surface Interflow Groundwater
18396-forest terrace-perkins 3/5/2020 9:30:37 AM Page 4
Mitigated Land Use
Collected
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Lawn, Flat 0.19
C, Forest, Flat 0.48
Pervious Total 0.67
Impervious Land Use acre
ROADS FLAT 0.05
Impervious Total 0.05
Basin Total 0.72
Element Flows To:
Surface Interflow Groundwater
18396-forest terrace-perkins 3/5/2020 9:30:37 AM Page 5
Routing Elements
Predeveloped Routing
18396-forest terrace-perkins 3/5/2020 9:30:37 AM Page 6
Mitigated Routing
18396-forest terrace-perkins 3/5/2020 9:30:37 AM Page 7
Analysis Results
POC 1
+ Predeveloped x Mitigated
Predeveloped Landuse Totals for POC #1
Total Pervious Area:0.72
Total Impervious Area:0
Mitigated Landuse Totals for POC #1
Total Pervious Area:0.67
Total Impervious Area:0.05
Flow Frequency Method:Log Pearson Type III 17B
Flow Frequency Return Periods for Predeveloped. POC #1
Return Period Flow(cfs)
2 year 0.028127
5 year 0.046372
10 year 0.060222
25 year 0.079578
50 year 0.095275
100 year 0.112024
Flow Frequency Return Periods for Mitigated. POC #1
Return Period Flow(cfs)
2 year 0.060302
5 year 0.092119
10 year 0.116043
25 year 0.149509
50 year 0.176803
100 year 0.206139
Annual Peaks
Annual Peaks for Predeveloped and Mitigated. POC #1
Year Predeveloped Mitigated
1949 0.034 0.098
1950 0.040 0.097
1951 0.058 0.069
1952 0.019 0.037
1953 0.016 0.029
1954 0.024 0.049
1955 0.036 0.053
1956 0.030 0.054
1957 0.027 0.072
1958 0.027 0.038
18396-forest terrace-perkins 3/5/2020 9:31:11 AM Page 8
1959 0.023 0.036
1960 0.045 0.075
1961 0.022 0.056
1962 0.015 0.026
1963 0.022 0.055
1964 0.028 0.051
1965 0.021 0.068
1966 0.018 0.040
1967 0.043 0.100
1968 0.025 0.062
1969 0.024 0.062
1970 0.020 0.056
1971 0.026 0.068
1972 0.044 0.093
1973 0.021 0.034
1974 0.024 0.063
1975 0.033 0.077
1976 0.024 0.054
1977 0.008 0.046
1978 0.020 0.049
1979 0.012 0.044
1980 0.063 0.123
1981 0.018 0.056
1982 0.044 0.115
1983 0.030 0.051
1984 0.019 0.041
1985 0.011 0.048
1986 0.047 0.069
1987 0.043 0.068
1988 0.019 0.027
1989 0.012 0.026
1990 0.120 0.216
1991 0.054 0.136
1992 0.023 0.047
1993 0.022 0.032
1994 0.009 0.021
1995 0.029 0.046
1996 0.069 0.108
1997 0.054 0.074
1998 0.019 0.052
1999 0.075 0.149
2000 0.021 0.059
2001 0.005 0.038
2002 0.029 0.090
2003 0.040 0.086
2004 0.046 0.111
2005 0.030 0.063
2006 0.032 0.061
2007 0.089 0.184
2008 0.095 0.137
2009 0.043 0.086
Ranked Annual Peaks
Ranked Annual Peaks for Predeveloped and Mitigated. POC #1
Rank Predeveloped Mitigated
1 0.1205 0.2164
2 0.0947 0.1843
3 0.0891 0.1492
18396-forest terrace-perkins 3/5/2020 9:31:11 AM Page 9
4 0.0750 0.1368
5 0.0687 0.1361
6 0.0629 0.1231
7 0.0578 0.1150
8 0.0543 0.1106
9 0.0542 0.1079
10 0.0470 0.0996
11 0.0464 0.0981
12 0.0449 0.0973
13 0.0442 0.0927
14 0.0437 0.0897
15 0.0432 0.0861
16 0.0427 0.0857
17 0.0426 0.0768
18 0.0402 0.0753
19 0.0400 0.0738
20 0.0365 0.0718
21 0.0344 0.0693
22 0.0335 0.0689
23 0.0316 0.0681
24 0.0305 0.0680
25 0.0300 0.0676
26 0.0297 0.0634
27 0.0292 0.0626
28 0.0292 0.0619
29 0.0275 0.0616
30 0.0273 0.0607
31 0.0269 0.0587
32 0.0256 0.0562
33 0.0250 0.0560
34 0.0241 0.0557
35 0.0238 0.0551
36 0.0237 0.0536
37 0.0235 0.0536
38 0.0232 0.0535
39 0.0227 0.0523
40 0.0224 0.0513
41 0.0220 0.0510
42 0.0219 0.0495
43 0.0209 0.0492
44 0.0209 0.0475
45 0.0205 0.0467
46 0.0202 0.0463
47 0.0200 0.0457
48 0.0194 0.0439
49 0.0193 0.0407
50 0.0190 0.0402
51 0.0186 0.0377
52 0.0183 0.0376
53 0.0182 0.0370
54 0.0163 0.0357
55 0.0152 0.0338
56 0.0125 0.0323
57 0.0116 0.0291
58 0.0111 0.0271
59 0.0089 0.0263
60 0.0082 0.0262
61 0.0055 0.0214
18396-forest terrace-perkins 3/5/2020 9:31:11 AM Page 10
18396-forest terrace-perkins 3/5/2020 9:31:11 AM Page 11
Duration Flows
Flow(cfs)Predev Mit Percentage Pass/Fail
0.0141 18452 28725 155 Fail
0.0149 16095 25132 156 Fail
0.0157 14324 21945 153 Fail
0.0165 12694 19327 152 Fail
0.0173 11184 17205 153 Fail
0.0182 9888 15359 155 Fail
0.0190 8819 13700 155 Fail
0.0198 7843 12262 156 Fail
0.0206 7007 10998 156 Fail
0.0214 6295 9858 156 Fail
0.0223 5679 8928 157 Fail
0.0231 5174 8083 156 Fail
0.0239 4699 7324 155 Fail
0.0247 4280 6654 155 Fail
0.0255 3910 6083 155 Fail
0.0264 3527 5570 157 Fail
0.0272 3185 5101 160 Fail
0.0280 2864 4703 164 Fail
0.0288 2594 4327 166 Fail
0.0296 2355 3972 168 Fail
0.0305 2141 3662 171 Fail
0.0313 1951 3373 172 Fail
0.0321 1795 3086 171 Fail
0.0329 1669 2821 169 Fail
0.0338 1514 2618 172 Fail
0.0346 1343 2406 179 Fail
0.0354 1222 2229 182 Fail
0.0362 1123 2079 185 Fail
0.0370 1042 1946 186 Fail
0.0379 969 1801 185 Fail
0.0387 910 1666 183 Fail
0.0395 838 1554 185 Fail
0.0403 766 1449 189 Fail
0.0411 704 1349 191 Fail
0.0420 633 1261 199 Fail
0.0428 570 1189 208 Fail
0.0436 488 1096 224 Fail
0.0444 425 1015 238 Fail
0.0452 376 944 251 Fail
0.0461 341 887 260 Fail
0.0469 307 818 266 Fail
0.0477 271 758 279 Fail
0.0485 235 697 296 Fail
0.0493 196 648 330 Fail
0.0502 171 592 346 Fail
0.0510 145 544 375 Fail
0.0518 125 503 402 Fail
0.0526 107 461 430 Fail
0.0534 95 427 449 Fail
0.0543 84 403 479 Fail
0.0551 71 363 511 Fail
0.0559 61 339 555 Fail
0.0567 55 321 583 Fail
0.0575 45 301 668 Fail
18396-forest terrace-perkins 3/5/2020 9:31:11 AM Page 12
0.0584 40 287 717 Fail
0.0592 37 268 724 Fail
0.0600 35 255 728 Fail
0.0608 29 240 827 Fail
0.0616 25 226 904 Fail
0.0625 22 212 963 Fail
0.0633 17 198 1164 Fail
0.0641 15 192 1280 Fail
0.0649 11 178 1618 Fail
0.0657 9 171 1900 Fail
0.0666 8 164 2050 Fail
0.0674 8 157 1962 Fail
0.0682 8 143 1787 Fail
0.0690 7 136 1942 Fail
0.0698 7 131 1871 Fail
0.0707 7 130 1857 Fail
0.0715 7 127 1814 Fail
0.0723 7 121 1728 Fail
0.0731 7 115 1642 Fail
0.0739 7 108 1542 Fail
0.0748 6 102 1700 Fail
0.0756 5 98 1960 Fail
0.0764 5 96 1920 Fail
0.0772 5 90 1800 Fail
0.0780 4 87 2175 Fail
0.0789 4 85 2125 Fail
0.0797 4 81 2025 Fail
0.0805 4 76 1900 Fail
0.0813 4 76 1900 Fail
0.0821 4 73 1825 Fail
0.0830 4 71 1775 Fail
0.0838 4 69 1725 Fail
0.0846 4 68 1700 Fail
0.0854 4 67 1675 Fail
0.0863 3 65 2166 Fail
0.0871 3 65 2166 Fail
0.0879 3 62 2066 Fail
0.0887 3 59 1966 Fail
0.0895 2 57 2850 Fail
0.0904 2 52 2600 Fail
0.0912 2 51 2550 Fail
0.0920 2 47 2350 Fail
0.0928 2 45 2250 Fail
0.0936 2 44 2200 Fail
0.0945 2 41 2050 Fail
0.0953 1 39 3900 Fail
The development has an increase in flow durations
from 1/2 Predeveloped 2 year flow to the 2 year flow
or more than a 10% increase from the 2 year to the 50
year flow.
The development has an increase in flow durations for
more than 50% of the flows for the range of the
duration analysis.
18396-forest terrace-perkins 3/5/2020 9:31:11 AM Page 13
Water Quality
Water Quality BMP Flow and Volume for POC #1
On-line facility volume:1.1584 acre-feet
On-line facility target flow:1.1226 cfs.
Adjusted for 15 min:1.1226 cfs.
Off-line facility target flow:0.6206 cfs.
Adjusted for 15 min:0.6206 cfs.
18396-forest terrace-perkins 3/5/2020 9:31:11 AM Page 14
LID Report
18396-forest terrace-perkins 3/5/2020 9:31:20 AM Page 15
Model Default Modifications
Total of 0 changes have been made.
PERLND Changes
No PERLND changes have been made.
IMPLND Changes
No IMPLND changes have been made.
18396-forest terrace-perkins 3/5/2020 9:31:20 AM Page 16
Appendix
Predeveloped Schematic
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 17
Mitigated Schematic
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 18
Predeveloped UCI File
RUN
GLOBAL
WWHM4 model simulation
START 1948 10 01 END 2009 09 30
RUN INTERP OUTPUT LEVEL 3 0
RESUME 0 RUN 1 UNIT SYSTEM 1
END GLOBAL
FILES
<File> <Un#> <-----------File Name------------------------------>***
<-ID-> ***
WDM 26 18396-forest terrace-perkins.wdm
MESSU 25 Pre18396-forest terrace-perkins.MES
27 Pre18396-forest terrace-perkins.L61
28 Pre18396-forest terrace-perkins.L62
30 POC18396-forest terrace-perkins1.dat
END FILES
OPN SEQUENCE
INGRP INDELT 00:15
PERLND 10
COPY 501
DISPLY 1
END INGRP
END OPN SEQUENCE
DISPLY
DISPLY-INFO1
# - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND
1 Basin 1 MAX 1 2 30 9
END DISPLY-INFO1
END DISPLY
COPY
TIMESERIES
# - # NPT NMN ***
1 1 1
501 1 1
END TIMESERIES
END COPY
GENER
OPCODE
# # OPCD ***
END OPCODE
PARM
# # K ***
END PARM
END GENER
PERLND
GEN-INFO
<PLS ><-------Name------->NBLKS Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
10 C, Forest, Flat 1 1 1 1 27 0
END GEN-INFO
*** Section PWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ***
10 0 0 1 0 0 0 0 0 0 0 0 0
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ***************************** PIVL PYR
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *********
10 0 0 4 0 0 0 0 0 0 0 0 0 1 9
END PRINT-INFO
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 19
PWAT-PARM1
<PLS > PWATER variable monthly parameter value flags ***
# - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT ***
10 0 0 0 0 0 0 0 0 0 0 0
END PWAT-PARM1
PWAT-PARM2
<PLS > PWATER input info: Part 2 ***
# - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC
10 0 4.5 0.08 400 0.05 0.5 0.996
END PWAT-PARM2
PWAT-PARM3
<PLS > PWATER input info: Part 3 ***
# - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP
10 0 0 2 2 0 0 0
END PWAT-PARM3
PWAT-PARM4
<PLS > PWATER input info: Part 4 ***
# - # CEPSC UZSN NSUR INTFW IRC LZETP ***
10 0.2 0.5 0.35 6 0.5 0.7
END PWAT-PARM4
PWAT-STATE1
<PLS > *** Initial conditions at start of simulation
ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 ***
# - # *** CEPS SURS UZS IFWS LZS AGWS GWVS
10 0 0 0 0 2.5 1 0
END PWAT-STATE1
END PERLND
IMPLND
GEN-INFO
<PLS ><-------Name-------> Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
END GEN-INFO
*** Section IWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW IWAT SLD IWG IQAL ***
END ACTIVITY
PRINT-INFO
<ILS > ******** Print-flags ******** PIVL PYR
# - # ATMP SNOW IWAT SLD IWG IQAL *********
END PRINT-INFO
IWAT-PARM1
<PLS > IWATER variable monthly parameter value flags ***
# - # CSNO RTOP VRS VNN RTLI ***
END IWAT-PARM1
IWAT-PARM2
<PLS > IWATER input info: Part 2 ***
# - # *** LSUR SLSUR NSUR RETSC
END IWAT-PARM2
IWAT-PARM3
<PLS > IWATER input info: Part 3 ***
# - # ***PETMAX PETMIN
END IWAT-PARM3
IWAT-STATE1
<PLS > *** Initial conditions at start of simulation
# - # *** RETS SURS
END IWAT-STATE1
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 20
END IMPLND
SCHEMATIC
<-Source-> <--Area--> <-Target-> MBLK ***
<Name> # <-factor-> <Name> # Tbl# ***
Basin 1***
PERLND 10 0.72 COPY 501 12
PERLND 10 0.72 COPY 501 13
******Routing******
END SCHEMATIC
NETWORK
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
END NETWORK
RCHRES
GEN-INFO
RCHRES Name Nexits Unit Systems Printer ***
# - #<------------------><---> User T-series Engl Metr LKFG ***
in out ***
END GEN-INFO
*** Section RCHRES***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ***
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ******************* PIVL PYR
# - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR *********
END PRINT-INFO
HYDR-PARM1
RCHRES Flags for each HYDR Section ***
# - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each
FG FG FG FG possible exit *** possible exit possible exit
* * * * * * * * * * * * * * ***
END HYDR-PARM1
HYDR-PARM2
# - # FTABNO LEN DELTH STCOR KS DB50 ***
<------><--------><--------><--------><--------><--------><--------> ***
END HYDR-PARM2
HYDR-INIT
RCHRES Initial conditions for each HYDR section ***
# - # *** VOL Initial value of COLIND Initial value of OUTDGT
*** ac-ft for each possible exit for each possible exit
<------><--------> <---><---><---><---><---> *** <---><---><---><---><--->
END HYDR-INIT
END RCHRES
SPEC-ACTIONS
END SPEC-ACTIONS
FTABLES
END FTABLES
EXT SOURCES
<-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # ***
WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC
WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 21
WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP
WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP
END EXT SOURCES
EXT TARGETS
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ***
<Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg***
COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL
END EXT TARGETS
MASS-LINK
<Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->***
<Name> <Name> # #<-factor-> <Name> <Name> # #***
MASS-LINK 12
PERLND PWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 12
MASS-LINK 13
PERLND PWATER IFWO 0.083333 COPY INPUT MEAN
END MASS-LINK 13
END MASS-LINK
END RUN
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 22
Mitigated UCI File
RUN
GLOBAL
WWHM4 model simulation
START 1948 10 01 END 2009 09 30
RUN INTERP OUTPUT LEVEL 3 0
RESUME 0 RUN 1 UNIT SYSTEM 1
END GLOBAL
FILES
<File> <Un#> <-----------File Name------------------------------>***
<-ID-> ***
WDM 26 18396-forest terrace-perkins.wdm
MESSU 25 Mit18396-forest terrace-perkins.MES
27 Mit18396-forest terrace-perkins.L61
28 Mit18396-forest terrace-perkins.L62
30 POC18396-forest terrace-perkins1.dat
END FILES
OPN SEQUENCE
INGRP INDELT 00:15
PERLND 16
PERLND 10
IMPLND 1
COPY 501
DISPLY 1
END INGRP
END OPN SEQUENCE
DISPLY
DISPLY-INFO1
# - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND
1 Collected MAX 1 2 30 9
END DISPLY-INFO1
END DISPLY
COPY
TIMESERIES
# - # NPT NMN ***
1 1 1
501 1 1
END TIMESERIES
END COPY
GENER
OPCODE
# # OPCD ***
END OPCODE
PARM
# # K ***
END PARM
END GENER
PERLND
GEN-INFO
<PLS ><-------Name------->NBLKS Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
16 C, Lawn, Flat 1 1 1 1 27 0
10 C, Forest, Flat 1 1 1 1 27 0
END GEN-INFO
*** Section PWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ***
16 0 0 1 0 0 0 0 0 0 0 0 0
10 0 0 1 0 0 0 0 0 0 0 0 0
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ***************************** PIVL PYR
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 23
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *********
16 0 0 4 0 0 0 0 0 0 0 0 0 1 9
10 0 0 4 0 0 0 0 0 0 0 0 0 1 9
END PRINT-INFO
PWAT-PARM1
<PLS > PWATER variable monthly parameter value flags ***
# - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT ***
16 0 0 0 0 0 0 0 0 0 0 0
10 0 0 0 0 0 0 0 0 0 0 0
END PWAT-PARM1
PWAT-PARM2
<PLS > PWATER input info: Part 2 ***
# - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC
16 0 4.5 0.03 400 0.05 0.5 0.996
10 0 4.5 0.08 400 0.05 0.5 0.996
END PWAT-PARM2
PWAT-PARM3
<PLS > PWATER input info: Part 3 ***
# - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP
16 0 0 2 2 0 0 0
10 0 0 2 2 0 0 0
END PWAT-PARM3
PWAT-PARM4
<PLS > PWATER input info: Part 4 ***
# - # CEPSC UZSN NSUR INTFW IRC LZETP ***
16 0.1 0.25 0.25 6 0.5 0.25
10 0.2 0.5 0.35 6 0.5 0.7
END PWAT-PARM4
PWAT-STATE1
<PLS > *** Initial conditions at start of simulation
ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 ***
# - # *** CEPS SURS UZS IFWS LZS AGWS GWVS
16 0 0 0 0 2.5 1 0
10 0 0 0 0 2.5 1 0
END PWAT-STATE1
END PERLND
IMPLND
GEN-INFO
<PLS ><-------Name-------> Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
1 ROADS/FLAT 1 1 1 27 0
END GEN-INFO
*** Section IWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW IWAT SLD IWG IQAL ***
1 0 0 1 0 0 0
END ACTIVITY
PRINT-INFO
<ILS > ******** Print-flags ******** PIVL PYR
# - # ATMP SNOW IWAT SLD IWG IQAL *********
1 0 0 4 0 0 0 1 9
END PRINT-INFO
IWAT-PARM1
<PLS > IWATER variable monthly parameter value flags ***
# - # CSNO RTOP VRS VNN RTLI ***
1 0 0 0 0 0
END IWAT-PARM1
IWAT-PARM2
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 24
<PLS > IWATER input info: Part 2 ***
# - # *** LSUR SLSUR NSUR RETSC
1 400 0.01 0.1 0.1
END IWAT-PARM2
IWAT-PARM3
<PLS > IWATER input info: Part 3 ***
# - # ***PETMAX PETMIN
1 0 0
END IWAT-PARM3
IWAT-STATE1
<PLS > *** Initial conditions at start of simulation
# - # *** RETS SURS
1 0 0
END IWAT-STATE1
END IMPLND
SCHEMATIC
<-Source-> <--Area--> <-Target-> MBLK ***
<Name> # <-factor-> <Name> # Tbl# ***
Collected***
PERLND 16 0.19 COPY 501 12
PERLND 16 0.19 COPY 501 13
PERLND 10 0.48 COPY 501 12
PERLND 10 0.48 COPY 501 13
IMPLND 1 0.05 COPY 501 15
******Routing******
END SCHEMATIC
NETWORK
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
END NETWORK
RCHRES
GEN-INFO
RCHRES Name Nexits Unit Systems Printer ***
# - #<------------------><---> User T-series Engl Metr LKFG ***
in out ***
END GEN-INFO
*** Section RCHRES***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ***
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ******************* PIVL PYR
# - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR *********
END PRINT-INFO
HYDR-PARM1
RCHRES Flags for each HYDR Section ***
# - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each
FG FG FG FG possible exit *** possible exit possible exit
* * * * * * * * * * * * * * ***
END HYDR-PARM1
HYDR-PARM2
# - # FTABNO LEN DELTH STCOR KS DB50 ***
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 25
<------><--------><--------><--------><--------><--------><--------> ***
END HYDR-PARM2
HYDR-INIT
RCHRES Initial conditions for each HYDR section ***
# - # *** VOL Initial value of COLIND Initial value of OUTDGT
*** ac-ft for each possible exit for each possible exit
<------><--------> <---><---><---><---><---> *** <---><---><---><---><--->
END HYDR-INIT
END RCHRES
SPEC-ACTIONS
END SPEC-ACTIONS
FTABLES
END FTABLES
EXT SOURCES
<-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # ***
WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC
WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC
WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP
WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP
END EXT SOURCES
EXT TARGETS
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ***
<Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg***
COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL
COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL
END EXT TARGETS
MASS-LINK
<Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->***
<Name> <Name> # #<-factor-> <Name> <Name> # #***
MASS-LINK 12
PERLND PWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 12
MASS-LINK 13
PERLND PWATER IFWO 0.083333 COPY INPUT MEAN
END MASS-LINK 13
MASS-LINK 15
IMPLND IWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 15
END MASS-LINK
END RUN
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 26
Predeveloped HSPF Message File
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 27
Mitigated HSPF Message File
18396-forest terrace-perkins 3/5/2020 9:31:21 AM Page 28
Disclaimer
Legal Notice
This program and accompanying documentation are provided 'as-is' without warranty of any kind. The
entire risk regarding the performance and results of this program is assumed by End User. Clear
Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either
expressed or implied, including but not limited to implied warranties of program and accompanying
documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever
(including without limitation to damages for loss of business profits, loss of business information,
business interruption, and the like) arising out of the use of, or inability to use this program even
if Clear Creek Solutions Inc. or their authorized representatives have been advised of the
possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2020; All
Rights Reserved.
Clear Creek Solutions, Inc.
6200 Capitol Blvd. Ste F
Olympia, WA. 98501
Toll Free 1(866)943-0304
Local (360)943-0304
www.clearcreeksolutions.com
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Thursday, Mar 5 2020
<Name>
Trapezoidal
Bottom Width (ft) = 3.50
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 0.04
Invert Elev (ft) = 1.00
Slope (%) = 17.50
N-Value = 0.035
Calculations
Compute by: Q vs Depth
No. Increments = 1
Highlighted
Depth (ft) = 0.04
Q (cfs) = 0.293
Area (sqft) = 0.14
Velocity (ft/s) = 2.03
Wetted Perim (ft) = 3.75
Crit Depth, Yc (ft) = 0.04
Top Width (ft) = 3.74
EGL (ft) = 0.10
0 .5 1 1.5 2 2.5 3 3.5 4 4.5 5
Elev (ft) Depth (ft)Section
0.75 -0.25
1.00 0.00
1.25 0.25
1.50 0.50
1.75 0.75
2.00 1.00
Reach (ft)
CB#4A Perkins Runoff5.0.4
WWHM2012
PROJECT REPORT
FIG 5.0.4 - FOREST TERRACE
CB#4A PERKINS RUNOFF
18396-forest terrace-bypass 3/3/2020 8:37:55 AM Page 2
General Model Information
Project Name:18396-forest terrace-bypass
Site Name:
Site Address:
City:
Report Date:3/3/2020
Gage:Seatac
Data Start:1948/10/01
Data End:2009/09/30
Timestep:15 Minute
Precip Scale:0.000 (adjusted)
Version Date:2019/09/13
Version:4.2.17
POC Thresholds
Low Flow Threshold for POC1:50 Percent of the 2 Year
High Flow Threshold for POC1:50 Year
18396-forest terrace-bypass 3/3/2020 8:37:55 AM Page 3
Landuse Basin Data
Predeveloped Land Use
Basin 1
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Forest, Flat 6.88
Pervious Total 6.88
Impervious Land Use acre
Impervious Total 0
Basin Total 6.88
Element Flows To:
Surface Interflow Groundwater
18396-forest terrace-bypass 3/3/2020 8:37:55 AM Page 4
Mitigated Land Use
Collected
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Lawn, Flat 1.37
C, Forest, Flat 5.01
Pervious Total 6.38
Impervious Land Use acre
ROADS FLAT 0.5
Impervious Total 0.5
Basin Total 6.88
Element Flows To:
Surface Interflow Groundwater
18396-forest terrace-bypass 3/3/2020 8:37:55 AM Page 5
Routing Elements
Predeveloped Routing
18396-forest terrace-bypass 3/3/2020 8:37:55 AM Page 6
Mitigated Routing
18396-forest terrace-bypass 3/3/2020 8:37:55 AM Page 7
Analysis Results
POC 1
+ Predeveloped x Mitigated
Predeveloped Landuse Totals for POC #1
Total Pervious Area:6.88
Total Impervious Area:0
Mitigated Landuse Totals for POC #1
Total Pervious Area:6.38
Total Impervious Area:0.5
Flow Frequency Method:Log Pearson Type III 17B
Flow Frequency Return Periods for Predeveloped. POC #1
Return Period Flow(cfs)
2 year 0.26877
5 year 0.443113
10 year 0.575458
25 year 0.760411
50 year 0.910408
100 year 1.070448
Flow Frequency Return Periods for Mitigated. POC #1
Return Period Flow(cfs)
2 year 0.540325
5 year 0.817538
10 year 1.029125
25 year 1.329398
50 year 1.577734
100 year 1.847843
Annual Peaks
Annual Peaks for Predeveloped and Mitigated. POC #1
Year Predeveloped Mitigated
1949 0.329 0.864
1950 0.384 0.845
1951 0.553 0.653
1952 0.185 0.346
1953 0.156 0.274
1954 0.226 0.442
1955 0.349 0.498
1956 0.284 0.484
1957 0.257 0.640
1958 0.260 0.356
18396-forest terrace-bypass 3/3/2020 8:38:26 AM Page 8
1959 0.221 0.334
1960 0.429 0.693
1961 0.214 0.501
1962 0.145 0.245
1963 0.210 0.488
1964 0.263 0.467
1965 0.196 0.592
1966 0.174 0.368
1967 0.408 0.868
1968 0.239 0.540
1969 0.230 0.528
1970 0.193 0.505
1971 0.245 0.604
1972 0.422 0.799
1973 0.199 0.318
1974 0.225 0.558
1975 0.320 0.691
1976 0.228 0.488
1977 0.079 0.394
1978 0.191 0.440
1979 0.119 0.408
1980 0.601 1.103
1981 0.175 0.496
1982 0.418 1.011
1983 0.287 0.446
1984 0.181 0.365
1985 0.106 0.412
1986 0.449 0.639
1987 0.413 0.633
1988 0.178 0.257
1989 0.111 0.261
1990 1.151 1.931
1991 0.518 1.188
1992 0.216 0.428
1993 0.209 0.305
1994 0.085 0.199
1995 0.279 0.423
1996 0.656 0.983
1997 0.519 0.680
1998 0.185 0.469
1999 0.717 1.317
2000 0.200 0.520
2001 0.052 0.342
2002 0.279 0.777
2003 0.383 0.768
2004 0.443 0.955
2005 0.291 0.574
2006 0.302 0.547
2007 0.851 1.620
2008 0.905 1.260
2009 0.407 0.774
Ranked Annual Peaks
Ranked Annual Peaks for Predeveloped and Mitigated. POC #1
Rank Predeveloped Mitigated
1 1.1511 1.9308
2 0.9048 1.6201
3 0.8513 1.3168
18396-forest terrace-bypass 3/3/2020 8:38:26 AM Page 9
4 0.7170 1.2597
5 0.6563 1.1881
6 0.6014 1.1033
7 0.5526 1.0111
8 0.5188 0.9831
9 0.5182 0.9549
10 0.4493 0.8683
11 0.4435 0.8640
12 0.4289 0.8446
13 0.4221 0.7987
14 0.4175 0.7765
15 0.4129 0.7740
16 0.4084 0.7684
17 0.4073 0.6929
18 0.3841 0.6905
19 0.3827 0.6799
20 0.3487 0.6531
21 0.3290 0.6401
22 0.3201 0.6386
23 0.3019 0.6328
24 0.2914 0.6041
25 0.2869 0.5920
26 0.2841 0.5736
27 0.2793 0.5585
28 0.2791 0.5472
29 0.2632 0.5402
30 0.2604 0.5284
31 0.2566 0.5199
32 0.2450 0.5055
33 0.2387 0.5010
34 0.2305 0.4982
35 0.2278 0.4959
36 0.2260 0.4885
37 0.2246 0.4879
38 0.2213 0.4839
39 0.2165 0.4689
40 0.2145 0.4668
41 0.2100 0.4462
42 0.2092 0.4417
43 0.2002 0.4400
44 0.1993 0.4282
45 0.1960 0.4226
46 0.1934 0.4122
47 0.1912 0.4083
48 0.1851 0.3938
49 0.1848 0.3683
50 0.1812 0.3646
51 0.1776 0.3559
52 0.1753 0.3456
53 0.1741 0.3416
54 0.1561 0.3341
55 0.1455 0.3181
56 0.1190 0.3046
57 0.1111 0.2744
58 0.1061 0.2615
59 0.0854 0.2574
60 0.0785 0.2446
61 0.0521 0.1994
18396-forest terrace-bypass 3/3/2020 8:38:26 AM Page 10
Q100 = 1.85 CFS
Q=AV
V = Q/A
V = 1.85 CFS/7.5 SF
V = 0.25 FPS
18396-forest terrace-bypass 3/3/2020 8:38:26 AM Page 11
Duration Flows
Flow(cfs)Predev Mit Percentage Pass/Fail
0.1344 18561 27784 149 Fail
0.1422 16140 24234 150 Fail
0.1501 14324 21102 147 Fail
0.1579 12857 18852 146 Fail
0.1657 11295 16754 148 Fail
0.1736 9980 14882 149 Fail
0.1814 8887 13272 149 Fail
0.1893 7871 11843 150 Fail
0.1971 7011 10587 151 Fail
0.2049 6361 9606 151 Fail
0.2128 5730 8652 150 Fail
0.2206 5208 7811 149 Fail
0.2284 4723 7071 149 Fail
0.2363 4293 6425 149 Fail
0.2441 3910 5871 150 Fail
0.2520 3568 5401 151 Fail
0.2598 3217 4954 153 Fail
0.2676 2894 4534 156 Fail
0.2755 2616 4171 159 Fail
0.2833 2363 3820 161 Fail
0.2912 2141 3514 164 Fail
0.2990 1975 3251 164 Fail
0.3068 1809 2975 164 Fail
0.3147 1674 2721 162 Fail
0.3225 1524 2505 164 Fail
0.3304 1349 2291 169 Fail
0.3382 1225 2127 173 Fail
0.3460 1123 1977 176 Fail
0.3539 1049 1859 177 Fail
0.3617 975 1707 175 Fail
0.3695 911 1583 173 Fail
0.3774 841 1479 175 Fail
0.3852 766 1358 177 Fail
0.3931 704 1263 179 Fail
0.4009 640 1185 185 Fail
0.4087 574 1107 192 Fail
0.4166 491 1026 208 Fail
0.4244 428 955 223 Fail
0.4323 378 880 232 Fail
0.4401 341 818 239 Fail
0.4479 312 753 241 Fail
0.4558 271 690 254 Fail
0.4636 239 639 267 Fail
0.4714 198 589 297 Fail
0.4793 171 548 320 Fail
0.4871 145 496 342 Fail
0.4950 125 453 362 Fail
0.5028 110 416 378 Fail
0.5106 97 388 400 Fail
0.5185 85 363 427 Fail
0.5263 71 325 457 Fail
0.5342 61 307 503 Fail
0.5420 55 287 521 Fail
0.5498 45 272 604 Fail
18396-forest terrace-bypass 3/3/2020 8:38:26 AM Page 12
0.5577 40 254 635 Fail
0.5655 37 241 651 Fail
0.5733 35 225 642 Fail
0.5812 29 213 734 Fail
0.5890 25 200 800 Fail
0.5969 22 192 872 Fail
0.6047 18 180 1000 Fail
0.6125 15 170 1133 Fail
0.6204 11 158 1436 Fail
0.6282 9 148 1644 Fail
0.6361 8 139 1737 Fail
0.6439 8 132 1650 Fail
0.6517 8 124 1550 Fail
0.6596 7 118 1685 Fail
0.6674 7 112 1600 Fail
0.6752 7 107 1528 Fail
0.6831 7 101 1442 Fail
0.6909 7 99 1414 Fail
0.6988 7 89 1271 Fail
0.7066 7 86 1228 Fail
0.7144 6 85 1416 Fail
0.7223 5 79 1580 Fail
0.7301 5 76 1520 Fail
0.7380 5 75 1500 Fail
0.7458 4 73 1825 Fail
0.7536 4 71 1775 Fail
0.7615 4 70 1750 Fail
0.7693 4 68 1700 Fail
0.7772 4 62 1550 Fail
0.7850 4 58 1450 Fail
0.7928 4 57 1425 Fail
0.8007 4 53 1325 Fail
0.8085 4 50 1250 Fail
0.8163 4 47 1175 Fail
0.8242 3 46 1533 Fail
0.8320 3 44 1466 Fail
0.8399 3 42 1400 Fail
0.8477 3 40 1333 Fail
0.8555 2 39 1950 Fail
0.8634 2 38 1900 Fail
0.8712 2 35 1750 Fail
0.8791 2 33 1650 Fail
0.8869 2 32 1600 Fail
0.8947 2 31 1550 Fail
0.9026 2 31 1550 Fail
0.9104 1 27 2700 Fail
The development has an increase in flow durations
from 1/2 Predeveloped 2 year flow to the 2 year flow
or more than a 10% increase from the 2 year to the 50
year flow.
The development has an increase in flow durations for
more than 50% of the flows for the range of the
duration analysis.
18396-forest terrace-bypass 3/3/2020 8:38:26 AM Page 13
Water Quality
Water Quality BMP Flow and Volume for POC #1
On-line facility volume:1.1584 acre-feet
On-line facility target flow:1.1226 cfs.
Adjusted for 15 min:1.1226 cfs.
Off-line facility target flow:0.6206 cfs.
Adjusted for 15 min:0.6206 cfs.
18396-forest terrace-bypass 3/3/2020 8:38:26 AM Page 14
LID Report
18396-forest terrace-bypass 3/3/2020 8:38:36 AM Page 15
Model Default Modifications
Total of 0 changes have been made.
PERLND Changes
No PERLND changes have been made.
IMPLND Changes
No IMPLND changes have been made.
18396-forest terrace-bypass 3/3/2020 8:38:36 AM Page 16
Appendix
Predeveloped Schematic
18396-forest terrace-bypass 3/3/2020 8:38:36 AM Page 17
Mitigated Schematic
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 18
Predeveloped UCI File
RUN
GLOBAL
WWHM4 model simulation
START 1948 10 01 END 2009 09 30
RUN INTERP OUTPUT LEVEL 3 0
RESUME 0 RUN 1 UNIT SYSTEM 1
END GLOBAL
FILES
<File> <Un#> <-----------File Name------------------------------>***
<-ID-> ***
WDM 26 18396-forest terrace-bypass.wdm
MESSU 25 Pre18396-forest terrace-bypass.MES
27 Pre18396-forest terrace-bypass.L61
28 Pre18396-forest terrace-bypass.L62
30 POC18396-forest terrace-bypass1.dat
END FILES
OPN SEQUENCE
INGRP INDELT 00:15
PERLND 10
COPY 501
DISPLY 1
END INGRP
END OPN SEQUENCE
DISPLY
DISPLY-INFO1
# - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND
1 Basin 1 MAX 1 2 30 9
END DISPLY-INFO1
END DISPLY
COPY
TIMESERIES
# - # NPT NMN ***
1 1 1
501 1 1
END TIMESERIES
END COPY
GENER
OPCODE
# # OPCD ***
END OPCODE
PARM
# # K ***
END PARM
END GENER
PERLND
GEN-INFO
<PLS ><-------Name------->NBLKS Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
10 C, Forest, Flat 1 1 1 1 27 0
END GEN-INFO
*** Section PWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ***
10 0 0 1 0 0 0 0 0 0 0 0 0
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ***************************** PIVL PYR
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *********
10 0 0 4 0 0 0 0 0 0 0 0 0 1 9
END PRINT-INFO
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 19
PWAT-PARM1
<PLS > PWATER variable monthly parameter value flags ***
# - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT ***
10 0 0 0 0 0 0 0 0 0 0 0
END PWAT-PARM1
PWAT-PARM2
<PLS > PWATER input info: Part 2 ***
# - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC
10 0 4.5 0.08 400 0.05 0.5 0.996
END PWAT-PARM2
PWAT-PARM3
<PLS > PWATER input info: Part 3 ***
# - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP
10 0 0 2 2 0 0 0
END PWAT-PARM3
PWAT-PARM4
<PLS > PWATER input info: Part 4 ***
# - # CEPSC UZSN NSUR INTFW IRC LZETP ***
10 0.2 0.5 0.35 6 0.5 0.7
END PWAT-PARM4
PWAT-STATE1
<PLS > *** Initial conditions at start of simulation
ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 ***
# - # *** CEPS SURS UZS IFWS LZS AGWS GWVS
10 0 0 0 0 2.5 1 0
END PWAT-STATE1
END PERLND
IMPLND
GEN-INFO
<PLS ><-------Name-------> Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
END GEN-INFO
*** Section IWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW IWAT SLD IWG IQAL ***
END ACTIVITY
PRINT-INFO
<ILS > ******** Print-flags ******** PIVL PYR
# - # ATMP SNOW IWAT SLD IWG IQAL *********
END PRINT-INFO
IWAT-PARM1
<PLS > IWATER variable monthly parameter value flags ***
# - # CSNO RTOP VRS VNN RTLI ***
END IWAT-PARM1
IWAT-PARM2
<PLS > IWATER input info: Part 2 ***
# - # *** LSUR SLSUR NSUR RETSC
END IWAT-PARM2
IWAT-PARM3
<PLS > IWATER input info: Part 3 ***
# - # ***PETMAX PETMIN
END IWAT-PARM3
IWAT-STATE1
<PLS > *** Initial conditions at start of simulation
# - # *** RETS SURS
END IWAT-STATE1
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 20
END IMPLND
SCHEMATIC
<-Source-> <--Area--> <-Target-> MBLK ***
<Name> # <-factor-> <Name> # Tbl# ***
Basin 1***
PERLND 10 6.88 COPY 501 12
PERLND 10 6.88 COPY 501 13
******Routing******
END SCHEMATIC
NETWORK
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
END NETWORK
RCHRES
GEN-INFO
RCHRES Name Nexits Unit Systems Printer ***
# - #<------------------><---> User T-series Engl Metr LKFG ***
in out ***
END GEN-INFO
*** Section RCHRES***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ***
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ******************* PIVL PYR
# - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR *********
END PRINT-INFO
HYDR-PARM1
RCHRES Flags for each HYDR Section ***
# - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each
FG FG FG FG possible exit *** possible exit possible exit
* * * * * * * * * * * * * * ***
END HYDR-PARM1
HYDR-PARM2
# - # FTABNO LEN DELTH STCOR KS DB50 ***
<------><--------><--------><--------><--------><--------><--------> ***
END HYDR-PARM2
HYDR-INIT
RCHRES Initial conditions for each HYDR section ***
# - # *** VOL Initial value of COLIND Initial value of OUTDGT
*** ac-ft for each possible exit for each possible exit
<------><--------> <---><---><---><---><---> *** <---><---><---><---><--->
END HYDR-INIT
END RCHRES
SPEC-ACTIONS
END SPEC-ACTIONS
FTABLES
END FTABLES
EXT SOURCES
<-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # ***
WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC
WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 21
WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP
WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP
END EXT SOURCES
EXT TARGETS
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ***
<Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg***
COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL
END EXT TARGETS
MASS-LINK
<Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->***
<Name> <Name> # #<-factor-> <Name> <Name> # #***
MASS-LINK 12
PERLND PWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 12
MASS-LINK 13
PERLND PWATER IFWO 0.083333 COPY INPUT MEAN
END MASS-LINK 13
END MASS-LINK
END RUN
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 22
Mitigated UCI File
RUN
GLOBAL
WWHM4 model simulation
START 1948 10 01 END 2009 09 30
RUN INTERP OUTPUT LEVEL 3 0
RESUME 0 RUN 1 UNIT SYSTEM 1
END GLOBAL
FILES
<File> <Un#> <-----------File Name------------------------------>***
<-ID-> ***
WDM 26 18396-forest terrace-bypass.wdm
MESSU 25 Mit18396-forest terrace-bypass.MES
27 Mit18396-forest terrace-bypass.L61
28 Mit18396-forest terrace-bypass.L62
30 POC18396-forest terrace-bypass1.dat
END FILES
OPN SEQUENCE
INGRP INDELT 00:15
PERLND 16
PERLND 10
IMPLND 1
COPY 501
DISPLY 1
END INGRP
END OPN SEQUENCE
DISPLY
DISPLY-INFO1
# - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND
1 Collected MAX 1 2 30 9
END DISPLY-INFO1
END DISPLY
COPY
TIMESERIES
# - # NPT NMN ***
1 1 1
501 1 1
END TIMESERIES
END COPY
GENER
OPCODE
# # OPCD ***
END OPCODE
PARM
# # K ***
END PARM
END GENER
PERLND
GEN-INFO
<PLS ><-------Name------->NBLKS Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
16 C, Lawn, Flat 1 1 1 1 27 0
10 C, Forest, Flat 1 1 1 1 27 0
END GEN-INFO
*** Section PWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ***
16 0 0 1 0 0 0 0 0 0 0 0 0
10 0 0 1 0 0 0 0 0 0 0 0 0
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ***************************** PIVL PYR
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 23
# - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *********
16 0 0 4 0 0 0 0 0 0 0 0 0 1 9
10 0 0 4 0 0 0 0 0 0 0 0 0 1 9
END PRINT-INFO
PWAT-PARM1
<PLS > PWATER variable monthly parameter value flags ***
# - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT ***
16 0 0 0 0 0 0 0 0 0 0 0
10 0 0 0 0 0 0 0 0 0 0 0
END PWAT-PARM1
PWAT-PARM2
<PLS > PWATER input info: Part 2 ***
# - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC
16 0 4.5 0.03 400 0.05 0.5 0.996
10 0 4.5 0.08 400 0.05 0.5 0.996
END PWAT-PARM2
PWAT-PARM3
<PLS > PWATER input info: Part 3 ***
# - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP
16 0 0 2 2 0 0 0
10 0 0 2 2 0 0 0
END PWAT-PARM3
PWAT-PARM4
<PLS > PWATER input info: Part 4 ***
# - # CEPSC UZSN NSUR INTFW IRC LZETP ***
16 0.1 0.25 0.25 6 0.5 0.25
10 0.2 0.5 0.35 6 0.5 0.7
END PWAT-PARM4
PWAT-STATE1
<PLS > *** Initial conditions at start of simulation
ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 ***
# - # *** CEPS SURS UZS IFWS LZS AGWS GWVS
16 0 0 0 0 2.5 1 0
10 0 0 0 0 2.5 1 0
END PWAT-STATE1
END PERLND
IMPLND
GEN-INFO
<PLS ><-------Name-------> Unit-systems Printer ***
# - # User t-series Engl Metr ***
in out ***
1 ROADS/FLAT 1 1 1 27 0
END GEN-INFO
*** Section IWATER***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # ATMP SNOW IWAT SLD IWG IQAL ***
1 0 0 1 0 0 0
END ACTIVITY
PRINT-INFO
<ILS > ******** Print-flags ******** PIVL PYR
# - # ATMP SNOW IWAT SLD IWG IQAL *********
1 0 0 4 0 0 0 1 9
END PRINT-INFO
IWAT-PARM1
<PLS > IWATER variable monthly parameter value flags ***
# - # CSNO RTOP VRS VNN RTLI ***
1 0 0 0 0 0
END IWAT-PARM1
IWAT-PARM2
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 24
<PLS > IWATER input info: Part 2 ***
# - # *** LSUR SLSUR NSUR RETSC
1 400 0.01 0.1 0.1
END IWAT-PARM2
IWAT-PARM3
<PLS > IWATER input info: Part 3 ***
# - # ***PETMAX PETMIN
1 0 0
END IWAT-PARM3
IWAT-STATE1
<PLS > *** Initial conditions at start of simulation
# - # *** RETS SURS
1 0 0
END IWAT-STATE1
END IMPLND
SCHEMATIC
<-Source-> <--Area--> <-Target-> MBLK ***
<Name> # <-factor-> <Name> # Tbl# ***
Collected***
PERLND 16 1.37 COPY 501 12
PERLND 16 1.37 COPY 501 13
PERLND 10 5.01 COPY 501 12
PERLND 10 5.01 COPY 501 13
IMPLND 1 0.5 COPY 501 15
******Routing******
END SCHEMATIC
NETWORK
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # #<-factor->strg <Name> # # <Name> # # ***
END NETWORK
RCHRES
GEN-INFO
RCHRES Name Nexits Unit Systems Printer ***
# - #<------------------><---> User T-series Engl Metr LKFG ***
in out ***
END GEN-INFO
*** Section RCHRES***
ACTIVITY
<PLS > ************* Active Sections *****************************
# - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG ***
END ACTIVITY
PRINT-INFO
<PLS > ***************** Print-flags ******************* PIVL PYR
# - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR *********
END PRINT-INFO
HYDR-PARM1
RCHRES Flags for each HYDR Section ***
# - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each
FG FG FG FG possible exit *** possible exit possible exit
* * * * * * * * * * * * * * ***
END HYDR-PARM1
HYDR-PARM2
# - # FTABNO LEN DELTH STCOR KS DB50 ***
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 25
<------><--------><--------><--------><--------><--------><--------> ***
END HYDR-PARM2
HYDR-INIT
RCHRES Initial conditions for each HYDR section ***
# - # *** VOL Initial value of COLIND Initial value of OUTDGT
*** ac-ft for each possible exit for each possible exit
<------><--------> <---><---><---><---><---> *** <---><---><---><---><--->
END HYDR-INIT
END RCHRES
SPEC-ACTIONS
END SPEC-ACTIONS
FTABLES
END FTABLES
EXT SOURCES
<-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> ***
<Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # ***
WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC
WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC
WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP
WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP
END EXT SOURCES
EXT TARGETS
<-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd ***
<Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg***
COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL
COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL
END EXT TARGETS
MASS-LINK
<Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->***
<Name> <Name> # #<-factor-> <Name> <Name> # #***
MASS-LINK 12
PERLND PWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 12
MASS-LINK 13
PERLND PWATER IFWO 0.083333 COPY INPUT MEAN
END MASS-LINK 13
MASS-LINK 15
IMPLND IWATER SURO 0.083333 COPY INPUT MEAN
END MASS-LINK 15
END MASS-LINK
END RUN
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 26
Predeveloped HSPF Message File
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 27
Mitigated HSPF Message File
18396-forest terrace-bypass 3/3/2020 8:38:37 AM Page 28
Disclaimer
Legal Notice
This program and accompanying documentation are provided 'as-is' without warranty of any kind. The
entire risk regarding the performance and results of this program is assumed by End User. Clear
Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either
expressed or implied, including but not limited to implied warranties of program and accompanying
documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever
(including without limitation to damages for loss of business profits, loss of business information,
business interruption, and the like) arising out of the use of, or inability to use this program even
if Clear Creek Solutions Inc. or their authorized representatives have been advised of the
possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2020; All
Rights Reserved.
Clear Creek Solutions, Inc.
6200 Capitol Blvd. Ste F
Olympia, WA. 98501
Toll Free 1(866)943-0304
Local (360)943-0304
www.clearcreeksolutions.com
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. Thursday, Mar 5 2020
<Name>
Trapezoidal
Bottom Width (ft) = 10.00
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 0.07
Invert Elev (ft) = 1.00
Slope (%) = 17.50
N-Value = 0.035
Calculations
Compute by: Q vs Depth
No. Increments = 1
Highlighted
Depth (ft) = 0.07
Q (cfs) = 2.122
Area (sqft) = 0.71
Velocity (ft/s) = 2.97
Wetted Perim (ft) = 10.44
Crit Depth, Yc (ft) = 0.07
Top Width (ft) = 10.42
EGL (ft) = 0.21
0 2 4 6 8 10 12 14 16
Elev (ft) Depth (ft)Section
0.75 -0.25
1.00 0.00
1.25 0.25
1.50 0.50
1.75 0.75
2.00 1.00
Reach (ft)
Tab 6.0
18396.003.TIR.doc
6.0 SPECIAL REPORTS AND STUDIES
6.1 Geotechnical Report for Forest Terrace (Vandermay) prepared by Terra Associates, Inc.
dated July 19, 2017
6.2 Geotechnical Report – Protected Slope Analysis for Forest Terrace (Vandermay) prepared
by Terra Associates, Inc. dated June 18, 2017
6.3 Arborist Report – Arborist Report Addendum #2 for Forest Terrace prepared by Tree
Solutions, Inc. dated November 7, 2019
6.4 Arborist Report – Arborist Report Addendum #3 for Forest Terrace prepared by Tree
Solutions, Inc. dated February 24, 2020
6.5 Geotechnical Engineering Review – Geotechnical Engineering Review prepared by Terra
Associates, Inc. dated February 28, 2020
6.6 Response to City of Renton Comments – Geotechnical Engineering Review prepared by
Terra Associates, Inc. dated February 28, 2020
6.7 Structural Report – Forest Terrace Plat Storm Water Detention Vault prepared by Site
Structures Dated October 21, 2019
6.8 Structural Plans – Forest Terrace Plat Storm Water Detention Vault prepared by Site
Structures Dated February 25, 2020
6.9 National Storm Water Quality Program Storm Water Pollution Prevention Plan (SWPPP)
dated March 11, 2020
Geotechnical Report for
Forest Terrace
(Vandermay) prepared
by Terra Associates,Inc.
dated July 19, 2017
6.1
SITE
Environmental Earth Sciences
Terra
Associates, Inc.
Consultants in Geotechnical Engineering
Geology and Figure 1
VICINITY MAP
0 2000 4000
APPROXIMATE SCALE IN FEET
Proj.No. T-7677 Date: JULY 2017
RENTON, WASHINGTON
VANDERMAY
TP-1TP-2TP-3TP-4TP-5TP-6TP-7TP-8TP-9TP-10TP-11TP-12TP-13TP-14TP-15TP-16TP-17TP-18REFERENCE:REFERENCE ONLY AND SHOULD NOT BE USED FORDESIGN OR CONSTRUCTION PURPOSES.DIMENSIONS ARE APPROXIMATE. IT IS INTENDED FORNOTE:THIS SITE PLAN IS SCHEMATIC. ALL LOCATIONS ANDConsultants in Geotechnical EngineeringTerraAssociates, Inc.Geology andEnvironmental Earth SciencesEXPLORATION LOCATION PLANFigure 2LEGEND:0100200APPROXIMATE SCALE IN FEETSITE PLAN PROVIDED BY BARGHAUSEN CONSULTING ENGINEERS.APPROXIMATE TEST PIT LOCATIONProj.No. T-7677Date: JULY 2017RENTON, WASHINGTONVANDERMAY
Proj.No. T-7677 Date: JULY 2017
RENTON, WASHINGTON
VANDERMAY
Environmental Earth Sciences
Terra
Associates, Inc.
Consultants in Geotechnical Engineering
Geology and
TYPICAL SLOPE KEY AND BENCH DETAIL
Figure 3
NOT TO SCALE
6' (MIN.)
2
1
EXISTING
SLOPE TOE
NOTES:
1)STRUCTURAL FILL SHALL BE COMPACTED TO A MINIMUM OF 95%
OF ASTM D 698 MAXIMUM DRY DENSITY VALUE.
TOE OF NEW
FILL EMBANKMENT
KEYWAY
6' (MIN.)
2' (MIN.)
1
1
STRUCTURAL FILL
(SEE NOTE 1)
TYPICAL SLOPE BENCH
CLEARED AND STRIPPED
NATIVE GROUND
1
1
2)DRAINS SHALL CONSIST OF 6" DIA. PERFORATED PVC PIPE ENVELOPED
IN 1 cu ft OF 3/4" WASHED GRAVEL. DRAIN PIPE SHALL BE DIRECTED TO
KEYWAY DRAIN
(SEE NOTE 2)
THE STORM DRAIN SYSTEM OR APPROVED POINT OF DISCHARGE.
(SEE NOTE 3)
3)ADDITIONAL BENCHES AND BENCH DRAINS MAY BE REQUIRED
BASED ON FIELD EVALUATION BY THE GEOTECHNICAL ENGINEER.
12"
COMPACTED
STRUCTURAL FILL
EXCAVATED SLOPE
(SEE REPORT TEXT
FOR APPROPRIATE
INCLINATIONS)
SLOPE TO DRAIN
12" MINIMUM 3/4"
MINUS WASHED
GRAVEL
3" BELOW PIPE
12" OVER PIPE
4" DIAMETER PERFORATED PVC PIPE
SEE NOTE
6"(MIN.)
NOT TO SCALE
NOTE:
MIRADRAIN G100N PREFABRICATED DRAINAGE PANELS OR SIMILAR
PRODUCT CAN BE SUBSTITUTED FOR THE 12-INCH WIDE GRAVEL
DRAIN BEHIND WALL. DRAINAGE PANELS SHOULD EXTEND A MINIMUM
OF SIX INCHES INTO 12-INCH THICK DRAINAGE GRAVEL LAYER
OVER PERFORATED DRAIN PIPE.
Environmental Earth Sciences
Terra
Associates, Inc.
Consultants in Geotechnical Engineering
Geology and
TYPICAL WALL DRAINAGE DETAIL
Figure 4Proj.No. T-7677 Date: JULY 2017
RENTON, WASHINGTON
VANDERMAY
Environmental Earth Sciences
Terra
Associates, Inc.
Consultants in Geotechnical Engineering
Geology and
MAJOR DIVISIONS LETTER
SYMBOL TYPICAL DESCRIPTION
GRAVELS
More than 50%
of coarse fraction
is larger than No.
4 sieve
Clean
Gravels (less
than 5%
fines)
GW Well-graded gravels, gravel-sand mixtures, little or no fines.
GP Poorly-graded gravels, gravel-sand mixtures, little or no fines.
Gravels with
fines
GM Silty gravels, gravel-sand-silt mixtures, non-plastic fines.
GC Clayey gravels, gravel-sand-clay mixtures, plastic fines.
SANDS
More than 50%
of coarse fraction
is smaller than
No. 4 sieve
Clean Sands
(less than
5% fines)
SW Well-graded sands, sands with gravel, little or no fines.
SP Poorly-graded sands, sands with gravel, little or no fines.
Sands with
fines
SM Silty sands, sand-silt mixtures, non-plastic fines.
SC Clayey sands, sand-clay mixtures, plastic fines.
SILTS AND CLAYS
Liquid Limit is less than 50%
ML Inorganic silts, rock flour, clayey silts with slight plasticity.
CL Inorganic clays of low to medium plasticity. (Lean clay)
OL Organic silts and organic clays of low plasticity.
SILTS AND CLAYS
Liquid Limit is greater than 50%
MH Inorganic silts, elastic.
CH Inorganic clays of high plasticity. (Fat clay)
OH Organic clays of high plasticity.
HIGHLY ORGANIC SOILS PT Peat.COARSE GRAINED SOILSMore than 50% material largerthan No. 200 sieve sizeFINE GRAINED SOILSMore than 50% material smallerthan No. 200 sieve sizeDEFINITION OF TERMS AND SYMBOLS
COHESIONLESSCOHESIVE Standard Penetration
Density Resistance in Blows/Foot
Very Loose 0-4
Loose 4-10
Medium Dense 10-30
Dense 30-50
Very Dense >50
Standard Penetration
Consistancy Resistance in Blows/Foot
Very Soft 0-2
Soft 2-4
Medium Stiff 4-8
Stiff 8-16
Very Stiff 16-32
Hard >32
2" OUTSIDE DIAMETER SPILT SPOON SAMPLER
2.4" INSIDE DIAMETER RING SAMPLER OR
SHELBY TUBE SAMPLER
WATER LEVEL (Date)
Tr TORVANE READINGS, tsf
Pp PENETROMETER READING, tsf
DD DRY DENSITY, pounds per cubic foot
LL LIQUID LIMIT, percent
PI PLASTIC INDEX
N STANDARD PENETRATION, blows per foot
UNIFIED SOIL CLASSIFICATION SYSTEM
Figure A-1Proj.No. T-7677 Date: JULY 2017
RENTON, WASHINGTON
VANDERMAY
Geotechnical Report
Protected Slope
Analysis for Forest
Terrace (Vandermay)
prepared by Terra
Associates, Inc. dated
June 18, 2017
6.2
Arborist Report
Addendum #2 for
Forest Terrace
prepared by Tree
Solutions, Inc. dated
6.3
November 7, 2019
2940 Westlake Ave. N (Suite #200) · Seattle, WA 98109 · Phone 206.528.4670
www.tr ee solut ion s. net
Project No. TS - 5487
Arborist Report
Addendum #2
TO: Pulte Group, Kyle Lublin
SITE: Forest Terrace - 2611 Union Ave NE, Renton, WA 98059
RE: Tree Inventory & Assessment
DATE: November 7, 2019
PROJECT ARBORIST: Holly Iosso
Registered Consulting Arborist #567
ISA Certified Arborist #PN-6298A, ISA Qualified Tree Risk Assessor
REFERENCED DOCS: Arborist Report (Tree Solutions Inc, December 15, 2017)
Addendum (Tree Solutions Inc, November 28, 2018)
Detailed Grading Plan (Barghausen, October 14, 2019)
Tree Retention Plan, P 1-12 (Barghausen, October 11, 2019)
ATTACHED: Table of Trees (Tree Solutions Inc, Revised October 24, 2019)
This addendum reflects changes to tree retention and tree removal quantities on this project, based on
the most recent plans presented to me (see above referenced documents). For removal and retention
calculations, I have separated tree quantities into five categories: trees currently in the right of way
(Union Avenue), trees within the newly created right of way (NE 27th Pl and Road B), trees offsite (on
properties surrounding Forest Terrace Plat and on the Perkins Property), and trees on site (on Lots 1-25,
and within Tracts A, B, C, D, and E). A summary of these removals are in figure 1:
Figure 1. Tree Removal Table
Tree Quantities Off Site in Current
ROW
(Union Ave)
Off Site (Perkins &
Adjacent Property)
Future ROW
(NE 27th Pl & Road
B)
On Site
(Lots 1-25 and
Tracts A-E)
Remove (viable) 3 9 166 723
Remove (not viable) 1 5 5 26
Retain* 0 89 0 111
Total Trees
Inventoried
4 103 171 860
*Includes both viable and poor condition trees which do not pose a high risk at this time.
Arborist Report Addendum 2 - Pulte Group – Forest Terrace Plat
November 7, 2019 page 2 of 6
2940 Westlake Ave. N #200 · Seattle, WA 98109 · Phone 206.528.4670
www.tr ee solut ion s. net
Of the 1138 significant trees Tree Solutions Inc inventoried, 37 meet Landmark status.1 Of these 37, 29
will be removed.
Based on the Renton Municipal Code (RMC) 4.4.130, land development in R-4 Zoning is required to
retain 30 percent of viable significant trees on site. When the minimum tree retention is not met, the
City may require that protected trees be replaced at a rate of 12 caliper inches of new trees for each
tree removed beyond the minimum requirement (RMC 4.4.130). Replacement trees must have a
minimum caliper size of 2 inches diameter; effectively resulting in six new replacement trees for each
tree removed on site. Up to 50 percent of the landscape trees required per RMC 4.4.070 may contribute
to replacement trees on site.
Alternatively, if the tree replacement requirements cannot be satisfied on the site due to spatial
constraints, the city may allow payment in-lieu to the City’s Urban Forestry fund. The payment amount
shall be determined by the City.
Non-viable trees are trees in poor health and/or structural condition and were not included in tree
replacement calculations. Similarly, trees removed within areas of mandatory ROW improvements do
not require replacement.
A summary of required tree replacements is in Figure 2.
Figure 2. Tree Removal Table
Calculations Tree Total
Total Viable Site Trees (excludes trees in new ROW) 828
30 % Tree Retention Requirement 828* 0.30 = 248 trees 248
Proposed Retained Trees 105
Remaining Trees Requiring Replacement 248 – 105 = 143 trees 143
Replacement Trees Required (if 2” cal trees planted) 143 x (12/2) = 858 trees 858
Replacement Trees Required (if 3” cal trees planted) 143 x (12/3) = 572 trees 572
Significant trees are to be replaced at a 6:1 ratio. This ratio was calculated by dividing the required caliper inches
(12) of new trees for each tree removed by the minimum caliper size required for all new trees (2). To decrease
replacement tree requirements, 3” caliper trees may be planted in certain protected areas with minimal slopes.
Recommendations
All trees proposed for retention should have tree protection measures implemented pursuant to the
RMC 4.4.130. This includes the protection of trees adjacent to the site that have driplines (canopies)
overlapping the development site. RMC 4.4.130 9b states protection area should be delineated at the
dripline or at a distance of 15 inches from the trunk for every 1-inch diameter listed in the arborist tree
table, whichever distance is larger. Tree protection fencing should be installed around this protected
area. Any previous drawings Tree Solutions has provided up to this point were conceptual and do not
reflect current drawings. The tree retention plan and demolition plan should be modified to include
location of tree protection fencing.
1 The city of Renton defines a significant tree as any tree 6 inches or greater in diameter at standard height (DSH), except red
alder (Alnus rubra) and black cottonwood (Populus trichocarpa) which must be 8 inches or greater. A Landmark tree is
defined as any tree 30 inches DSH or greater.
Arborist Report Addendum 2 - Pulte Group – Forest Terrace Plat
November 7, 2019 page 3 of 6
2940 Westlake Ave. N #200 · Seattle, WA 98109 · Phone 206.528.4670
www.tr ee solut ion s. net
During construction, I recommend that the contractor:
• Maintain trees free of invasive species, and carefully remove invasive plants on the ground
wherever possible.
• Apply wood chip mulch at a depth of 4 inches within the tree protection area.
• Leave trees as wildlife snags wherever possible during the removal process, or as nurse logs
on the ground.
• Establish tree protection areas prior to the commencement of site work activities and
maintain them throughout ALL phases of development.
• Follow protection measures listed in Appendix B ( RMC 4.4.130: Protection measures during
construction).
• Engage project arborist to be on site to monitor all ground disturbance work within the drip
line of protected trees.
The majority of the trees proposed for retention are along the southern property boundary. Based on
the proposed plans, a grove of trees will be preserved south of the development. Following tree
removal, trees that were previously sheltered within a grove should be re-evaluated by an arborist to
confirm irreparable damage was not caused during demolition and site work. Additionally, the arborist
should re-assess all trees, particularly edge trees, for risk following land clearing.
The inventory by Tree Solutions did not assess trees for risk and does not assume any liability from trees
left standing following construction.
Respectfully submitted,
Holly Iosso,
Sr. Arborist
Arborist Report Addendum 2 - Pulte Group – Forest Terrace Plat
November 7, 2019 page 4 of 6
2940 Westlake Ave. N #200 · Seattle, WA 98109 · Phone 206.528.4670
www.tr ee solut ion s. net
Aerial Photo of Site
Figure 2. Aerial photograph of the subject site. Source: King County iMap, accessed 12.15.2017.
Photograph
Photo 1. View from the school parking lot toward the south property boundary. Photo shows typical forest density
and species composition.
Arborist Report Addendum 2 - Pulte Group – Forest Terrace Plat
November 7, 2019 page 5 of 6
2940 Westlake Ave. N #200 · Seattle, WA 98109 · Phone 206.528.4670
www.tr ee solut ion s. net
Appendix A - Assumptions & Limiting Conditions
1. Consultant assumes that the site and its use do not violate, and is in compliance with, all
applicable codes, ordinances, statutes or regulations.
2. The consultant may provide a report or recommendation based on published municipal
regulations. The consultant assumes that the municipal regulations published on the date of the
report are current municipal regulations and assumes no obligation related to unpublished city
regulation information.
3. Any report by the consultant and any values expressed therein represent the opinion of the
consultant, and the consultant’s fee is in no way contingent upon the reporting of a specific
value, a stipulated result, the occurrence of a subsequent event, or upon any finding to be
reported.
4. All photographs included in this report were taken by Tree Solutions, Inc. during the
documented site visit, unless otherwise noted. Sketches, drawings and photographs (included
in, and attached to, this report) are intended as visual aids and are not necessarily to scale. They
should not be construed as engineering drawings, architectural reports or surveys. The
reproduction of any information generated by architects, engineers or other consultants and
any sketches, drawings or photographs is for the express purpose of coordination and ease of
reference only. Inclusion of such information on any drawings or other documents does not
constitute a representation by the consultant as to the sufficiency or accuracy of the
information.
5. Unless otherwise agreed, (1) information contained in any report by consultant covers only the
items examined and reflects the condition of those items at the time of inspection; and (2) the
inspection is limited to visual examination of accessible items without dissection, excavation,
probing, climbing, or coring.
6. These findings are based on the observations and opinions of the authoring arborist, and do not
provide guarantees regarding the future performance, health, vigor, structural stability or safety
of the plants described and assessed.
7. Measurements are subject to typical margins of error, considering the oval or asymmetrical
cross-section of most trunks and canopies.
8. Tree Solutions did not review any reports or perform any tests related to the soil located on the
subject property unless outlined in the scope of services. Tree Solutions staff are not and do not
claim to be soils experts. An independent inventory and evaluation of the site’s soil should be
obtained by a qualified professional if an additional understanding of the site’s characteristics is
needed to make an informed decision.
9. Our assessments are made in conformity with acceptable evaluation/diagnostic reporting
techniques and procedures, as recommended by the International Society of Arboriculture.
Arborist Report Addendum 2 - Pulte Group – Forest Terrace Plat
November 7, 2019 page 6 of 6
2940 Westlake Ave. N #200 · Seattle, WA 98109 · Phone 206.528.4670
www.tr ee solut ion s. net
Appendix B - Protection Measures During Construction (RMC 4.4.130)
a. Construction Storage Prohibited: The applicant may not fill, excavate, stack or store any equipment,
dispose of any materials, supplies or fluids, operate any equipment, install impervious surfaces, or
compact the earth in any way within the area defined by the drip line of any tree to be retained.
b. Fenced Protection Area Required: Prior to development activities, the applicant shall erect and
maintain six-foot (6') high chain link temporary construction fencing around the drip lines of all retained
trees or at a distance surrounding the tree equal to one and one-quarter feet (1-1/4') for every one inch
(1") of trunk caliper, whichever is greater, or along the perimeter of a tree protection tract. Placards
shall be placed on fencing every fifty feet (50') indicating the words, “NO TRESPASSING – Protected
Trees,” or on each side of the fencing if less than fifty feet (50'). Site access to individually protected
trees or groups of trees shall be fenced and signed. Individual trees shall be fenced on four (4) sides. In
addition, the applicant shall provide supervision whenever equipment or trucks are moving near trees.
c. Protection from Grade Changes: If the grade level adjoining to a tree to be retained is to be raised,
the applicant shall construct a dry rock wall or rock well around the tree. The diameter of this wall or
well must be equal to the tree’s drip line.
d. Impervious Surfaces Prohibited within the Drip Line: The applicant may not install impervious
surface material within the area defined by the drip line of any tree to be retained.
e. Restrictions on Grading within the Drip Lines of Retained Trees: The grade level around any tree to
be retained may not be lowered within the greater of the following areas: (i) the area defined by the
drip line of the tree, or (ii) an area around the tree equal to one and one-half feet (1-1/2') in diameter
for each one inch (1") of tree caliper. A larger tree protection zone based on tree size, species, soil, or
other conditions may be required. (Ord. 5676, 12-3-2012)
f. Mulch Layer Required: All areas within the required fencing shall be covered completely and evenly
with a minimum of three inches (3") of bark mulch prior to installation of the protective fencing.
Exceptions may be approved if the mulch will adversely affect protected ground cover plants. (Ord.
5676, 12-3-2012)
g. Monitoring Required during Construction: The applicant shall retain a certified arborist or licensed
landscape architect to ensure trees are protected from development activities and/or to prune branches
and roots, fertilize, and water as appropriate for any trees and ground cover that are to be retained.
h. Alternative Protection: Alternative safeguards may be used if determined to provide equal or greater
tree protection. (Ord. 5676, 12-3-2012; Ord. 5841, 6-12-2017)
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes1Acer macrophyllumBigleaf maple 25.1 Good Good 21 17 No Viable Retain2Pseudotsuga menziesiiDouglas‐fir 10.7 Good Good 11 7 No Viable Retain Kink in trunk, survey ID 105143Pseudotsuga menziesiiDouglas‐fir 14.5 Good Good 12 10 No Viable Retain Kink in trunk4Pseudotsuga menziesiiDouglas‐fir 7.7 Fair Fair 6 5 No Viable Retain Broken top, suppressed5Pseudotsuga menziesiiDouglas‐fir 17.3 Good Good 10 12 No Viable Retain6Pseudotsuga menziesiiDouglas‐fir 8.5 Fair Fair 5 6 No Viable Retain Broken top7Pseudotsuga menziesiiDouglas‐fir 11.0 Fair Fair 10 7 No Viable Retain Broken top8Acer macrophyllumBigleaf maple 10.3 Good Good 25 7 No Viable Retain Some dieback in crown9Acer macrophyllumBigleaf maple 10.0 8.3, 5.5 Good Good 20 7 No Viable Retain Codominant trunk form10Acer macrophyllumBigleaf maple 10.2 Fair Fair 15 7 No Viable Retain Broken top11Populus trichocarpaBlack cottonwood 27.8 Good Good 22 19 No Viable Retain Adjacent to power lines12Pseudotsuga menziesiiDouglas‐fir 21.2 Good Good 19 14 No Viable Retain13Pseudotsuga menziesiiDouglas‐fir 26.2 Good Good 25 17 No Viable Retain Kink in stem14Pseudotsuga menziesiiDouglas‐fir 13.8 Good Good 15 9 No Viable Retain Kink in stem15Pseudotsuga menziesiiDouglas‐fir 17.0 Good Good 17 11 No Viable Retain16Acer macrophyllumBigleaf maple 17.3 12, 12.5 Good Good 22 12 No Viable Retain Codominant, asymmetrical to eastTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 1 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes17Acer macrophyllumBigleaf maple 29.3 9.7, 11.7 , 6.6, 10.5, 11.9, 10.2, 12.5, 8.4Good Good 35 20 No Viable Retain Codominant, asymmetrical to east18Acer macrophyllumBigleaf maple 8.1 6.0, 5.4 Poor Poor 35 No Not ViableRetain Grading Codominant, asymmetrical to east19Pseudotsuga menziesiiDouglas‐fir 23.5 Good Good 15 16 No Viable Retain Phototropic lean20Acer macrophyllumBigleaf maple 10.0 Fair Fair 14 7 No Viable Retain Lost top, dieback, codominant21Pseudotsuga menziesiiDouglas‐fir 11.2 Good Good 11 7 No Viable Retain22Pseudotsuga menziesiiDouglas‐fir 15.7 Good Good 13 10 No Viable Retain23Pseudotsuga menziesiiDouglas‐fir 16.5 10.6, 12.7 Good Good 17 11 No Viable Retain Codominant at base24Acer macrophyllumBigleaf maple 7.8 Good Good 20 5 No Viable Retain Broken top25Acer macrophyllumBigleaf maple 7.7 Good Good 20 5 No Viable Retain Broken top26Acer macrophyllumBigleaf maple 6.6 Good Good 18 4 No Viable Retain27Acer macrophyllumBigleaf maple 8.7 Poor Poor 17 No Not ViableRetain Grading Dead top, sprouting along trunk28Acer macrophyllumBigleaf maple 6.0 Fair Fair 19 4 No Viable Retain Lost top, decay at top29Pseudotsuga menziesiiDouglas‐fir 29.0 Good Good 13 19 No Viable Retain30Pseudotsuga menziesiiDouglas‐fir 16.1 Good Good 16 11 No Viable Retain31Pseudotsuga menziesiiDouglas‐fir 14.6 Good Good 16 10 No Viable Retain32Acer macrophyllumBigleaf maple 6.5 Good Good 18 4 No Viable Retain Broken top, suppressedTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 2 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes33Pseudotsuga menziesiiDouglas‐fir 8.1 Good Good 10 5 No Viable Retain34Acer macrophyllumBigleaf maple 22.3 Good Good 35 15 No Viable Retain35Acer macrophyllumBigleaf maple 9.5 Good Good 20 6 No Viable Remove Grading Lost top. Maintain LOD. Confirm this includes any overexcavation required for installation of rockery.36Acer macrophyllumBigleaf maple 14.2 Good Good 20 9 No Viable Remove Grading Maintain LOD. Confirm this includes any overexcavation required for installation of rockery.37Acer macrophyllumBigleaf maple 7.8 Fair Fair 20 No Viable Remove Grading Broken top38Alnus rubraRed alder 12.1 Good Good 12 No Viable Remove Grading Broken top39Acer macrophyllumBigleaf maple 8.7 Good Good 16 No Viable Remove Grading Broken top40Pseudotsuga menziesiiDouglas‐fir 7.2 Poor Poor 10 No Not ViableRemove Grading41Acer macrophyllumBigleaf maple 9.5 Good Good 16 No Viable Remove Grading Trunk wound, good response growth42Acer macrophyllumBigleaf maple 10.3 Good Good 25 No Viable Remove Grading Broken top43Pseudotsuga menziesiiDouglas‐fir 14.0 Good Good 11 No Viable Remove Grading44Pseudotsuga menziesiiDouglas‐fir 7.0 Good Good 6 No Viable Remove Grading45Pseudotsuga menziesiiDouglas‐fir 16.6 Good Good 18 No Viable Remove Grading Phototropic lean, insect activity at baseTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 3 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes46Pseudotsuga menziesiiDouglas‐fir 8.0 Good Good 6 No Viable Remove Grading47Acer macrophyllumBigleaf maple 12.3 Good Good 25 No Viable Remove Grading Trunk rubbing with adjacent madrone tree48Pseudotsuga menziesiiDouglas‐fir 6.4 Good Good 6 No Viable Remove Grading Suppressed, kink in trunk49Pseudotsuga menziesiiDouglas‐fir 11.7 Good Good 12 No Viable Remove Grading Kink in trunk50Acer macrophyllumBigleaf maple 13.6 Good Good 25 No Viable Remove Grading Codominant, good union51Acer macrophyllumBigleaf maple 15.2 Good Good 27 No Viable Remove Grading52Acer macrophyllumBigleaf maple 15.9 Good Good 20 No Viable Remove Grading53Pseudotsuga menziesiiDouglas‐fir 12.2 Good Good 12 No Viable Remove Grading54Pseudotsuga menziesiiDouglas‐fir 10.4 Fair Fair 6 No Viable Remove Grading Suppressed55Pseudotsuga menziesiiDouglas‐fir 10.1 Fair Fair 8 No Viable Remove Grading Crown dieback56Acer macrophyllumBigleaf maple 6.4 Good Good 15 No Viable Remove Grading57Pseudotsuga menziesiiDouglas‐fir 10.0 Good Good 10 No Viable Remove Grading58Pseudotsuga menziesiiDouglas‐fir 18.0 Good Good 12 No Viable Remove Grading Curve in trunk at 20 feet59Pseudotsuga menziesiiDouglas‐fir 18.6 Good Good 11 No Viable Remove Grading60Pseudotsuga menziesiiDouglas‐fir 28.1 Good Good 20 No Viable Remove Grading61Pseudotsuga menziesiiDouglas‐fir 8.0 Fair Fair 7 No Viable Remove Grading Lost topTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 4 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes62Pseudotsuga menziesiiDouglas‐fir 11.7 Good Good 10 No Viable Remove Grading Lost top, epicormic sprouting63Pseudotsuga menziesiiDouglas‐fir 18.5 Good Good 12 No Viable Remove Grading Curved trunk64Acer macrophyllumBigleaf maple 7.5 Good Good 13 No Viable Remove Grading Broken top65Acer macrophyllumBigleaf maple 29.1 23.9, 16.6 Good Good 30 No Viable Remove Grading Multistemmed 66Acer macrophyllumBigleaf maple 63.7 Good Good 37 27 Yes Viable Remove Grading Diameter measured at narrowest point below codominant union, 4 fused trunks, included bark, some decay, dead wood in canopy. Maintain LOD. No disturbance includes bioretention swales.67Thuja plicataWestern redcedar 13.4 Good Good 10 9 No Viable Retain68Acer macrophyllumBigleaf maple 8.8 Good Good 12 6 No Viable Retain Some dieback69Pseudotsuga menziesiiDouglas‐fir 10.7 Good Good 13 7 No Viable Retain Codominant at 20 feet, survey ID 1060170Pseudotsuga menziesiiDouglas‐fir 16.2 Good Good 10 11 No Viable Retain71Alnus rubraRed alder 18.1 Poor Poor 21 No Not ViableRetain Grading Main trunk dead, diameter measured at narrowest point below codominant union72Acer macrophyllumBigleaf maple 8.7 Good Good 12 6 No Viable Retain73Acer macrophyllumBigleaf maple 7.2 Good Good 16 5 No Viable Retain Phototropic to east74Alnus rubraRed alder 19.5 Good Good 23 13 No Viable Retain Broken parts throughout canopyTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 5 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes75Acer macrophyllumBigleaf maple 19.4 Good Good 25 No Viable Remove Grading Old wounds76Acer macrophyllumBigleaf maple 9.2 Good Good 25 No Viable Remove Grading Broken top77Acer macrophyllumBigleaf maple 14.0 Good Good 16 9 No Viable Retain78Acer macrophyllumBigleaf maple 12.1 Good Good 25 8 No Viable Remove Grading79Pseudotsuga menziesiiDouglas‐fir 19.9 Good Good 15 No Viable Remove Grading Subdominant trunk at 20 feet80Acer macrophyllumBigleaf maple 16.8 Good Good 28 No Viable Remove Grading81Acer macrophyllumBigleaf maple 6.8 Poor Poor 4 No Not ViableRemove Grading Broken top, epicormic sprouts82Acer macrophyllumBigleaf maple 12.2 Good Good 22 No Viable Remove Grading83Acer macrophyllumBigleaf maple 11.6 Good Good 18 No Viable Remove Grading84Acer macrophyllumBigleaf maple 23.6 19.7, 13 Good Good 27 No Viable Remove Grading Pruned for utilities85Acer macrophyllumBigleaf maple 10.5 Good Good 23 No Viable Remove Grading86Acer macrophyllumBigleaf maple 15.2 Good Good 26 No Viable Remove Grading87Populus trichocarpaBlack cottonwood 29.7 Good Good 25 No Viable Remove Grading88Acer macrophyllumBigleaf maple 15.4 Good Good 30 No Viable Remove Grading Lean to north89Acer macrophyllumBigleaf maple 17.2 Good Good 28 No Viable Remove Grading90Pseudotsuga menziesiiDouglas‐fir 15.8 Good Good 12 No Viable Remove Grading91Pseudotsuga menziesiiDouglas‐fir 9.9 Good Good 12 No Viable Remove Grading92Acer macrophyllumBigleaf maple 6.9 Good Good 16 No Viable Remove Grading93Acer macrophyllumBigleaf maple 7.5 Good Good 12 No Viable Remove Grading94Acer macrophyllumBigleaf maple 13.2 Good Good 22 No Viable Remove Grading95Acer macrophyllumBigleaf maple 7.5 Good Good 15 No Viable Remove Grading96Pseudotsuga menziesiiDouglas‐fir 10.3 Fair Fair 8 No Viable Remove Grading Thin crown, swept base97Acer macrophyllumBigleaf maple 8.4 Good Good 18 No Viable Remove Grading Not on survey98Pseudotsuga menziesiiDouglas‐fir 8.9 Fair Fair 8 No Viable Remove Grading Thin crownTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 6 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes99Pseudotsuga menziesiiDouglas‐fir 7.9 Poor Poor 6 No Not ViableRemove Grading Broken top100Pseudotsuga menziesiiDouglas‐fir 13.5 Good Good 12 No Viable Remove Grading Kink in stem101Pseudotsuga menziesiiDouglas‐fir 9.7 Good Good 12 No Viable Remove Grading Thin crown102Sorbus aucupariaEuropean mountain ash6.3 Good Good 8 No Viable Remove Grading103Alnus rubraRed alder 11.2 Good Good 15 No Viable Remove Grading104Pseudotsuga menziesiiDouglas‐fir 34.6 Good Good 25 Yes Viable Remove Grading Insect holes, flat spot at base, cankers105Pseudotsuga menziesiiDouglas‐fir 9.4 Good Good 15 No Viable Remove Grading106Populus trichocarpaBlack cottonwood 24.0 Fair Fair 18 No Viable Remove Grading Broken codominant trunk107Acer macrophyllumBigleaf maple 9.4 Good Good 18 No Viable Remove Grading108Populus trichocarpaBlack cottonwood 27.9 Fair Fair 20 No Viable Remove Grading Abnormal bark texture at base109Acer macrophyllumBigleaf maple 13.7 Good Good 25 No Viable Remove Grading110Acer macrophyllumBigleaf maple 8.6 Good Good 17 No Viable Remove Grading111Prunus emarginataBitter cherry 6.2 Good Good 10 No Viable Remove Grading112Prunus emarginataBitter cherry 9.2 Good Good 16 No Viable Remove Grading113Prunus emarginataBitter cherry 7.4 Good Good 15 No Viable Remove Grading Forked top114Populus trichocarpaBlack cottonwood 30.8 Fair Fair 20 Yes Viable Remove Grading Dead subdominant trunk, forked top, dieback in crown115Prunus emarginataBitter cherry 10.8 Good Good 10 No Viable Remove New ROW116Pseudotsuga menziesiiDouglas‐fir 25.4 Good Good 20 No Viable Remove New ROWTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 7 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes117Pseudotsuga menziesiiDouglas‐fir 18.1 Good Good 20 No Viable Remove New ROW118Acer macrophyllumBigleaf maple 19.1 Good Good 27 No Viable Remove Grading Diameter measured at narrowest point below codominant union119Pseudotsuga menziesiiDouglas‐fir 21.9 Good Good 18 No Viable Remove Grading120Pseudotsuga menziesiiDouglas‐fir 21.3 Good Good 18 No Viable Remove Grading121Pseudotsuga menziesiiDouglas‐fir 12.6 Good Good 12 No Viable Remove Grading122Pseudotsuga menziesiiDouglas‐fir 6.2 Fair Fair 11 No Viable Remove Grading Suppressed, leaning into tree 120123Pseudotsuga menziesiiDouglas‐fir 16.5 Good Good 16 No Viable Remove Grading124Pseudotsuga menziesiiDouglas‐fir 12.0 Good Good 12 No Viable Remove Grading125Pseudotsuga menziesiiDouglas‐fir 8.0 Fair Fair 10 No Viable Remove Grading Suppressed, broken top126Acer macrophyllumBigleaf maple 6.1 Good Good 18 No Viable Remove Grading127Pseudotsuga menziesiiDouglas‐fir 6.7 Good Good 7 No Viable Remove Grading Previously suppressed128Acer macrophyllumBigleaf maple 8.4 Good Good 17 No Viable Remove Grading129Acer macrophyllumBigleaf maple 9.8 6.7, 7.2 Good Good 15 No Viable Remove Grading Codominant130Acer macrophyllumBigleaf maple 8.6 Good Good 23 No Viable Remove Grading Broken parts131Acer macrophyllumBigleaf maple 11.4 Good Good 19 No Viable Remove Grading132Acer macrophyllumBigleaf maple 11.1 Good Good 22 No Viable Remove New ROW133Acer macrophyllumBigleaf maple 6.7 Good Good 16 No Viable Remove New ROW SuppressedTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 8 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes134Acer macrophyllumBigleaf maple 6.7 Good Good 17 No Viable Remove New ROW135Acer macrophyllumBigleaf maple 6.8 Poor Poor 15 No Not ViableRemove New ROW Barely alive136Pseudotsuga menziesiiDouglas‐fir 19.1 Good Good 17 No Viable Remove Grading137Pseudotsuga menziesiiDouglas‐fir 14.8 Good Good 15 No Viable Remove Grading Thin canopy138Pseudotsuga menziesiiDouglas‐fir 13.2 Good Good 16 No Viable Remove Grading139Pseudotsuga menziesiiDouglas‐fir 13.3 Good Good 13 No Viable Remove Grading140Pseudotsuga menziesiiDouglas‐fir 10.0 Good Good 12 No Viable Remove Grading Shared base with 141141Populus trichocarpaBlack cottonwood 27.9 Good Good 30 No Viable Remove New ROW Wounds on trunk142Acer macrophyllumBigleaf maple 8.0 Good Good 16 No Viable Remove New ROW143Pseudotsuga menziesiiDouglas‐fir 19.0 Good Good 11 No Viable Remove Grading144Pseudotsuga menziesiiDouglas‐fir 14.3 Good Good 11 No Viable Remove New ROW145Pseudotsuga menziesiiDouglas‐fir 7.5 Fair Fair 5 No Viable Remove New ROW Suppressed, thin crown146Pseudotsuga menziesiiDouglas‐fir 15.5 Good Good 10 No Viable Remove New ROW147Alnus rubraRed alder 10.9 Good Good 12 No Viable Remove New ROW Some dieback throughout crown148Alnus rubraRed alder 12.0 Good Good 14 No Viable Remove New ROWTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 9 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes149Pseudotsuga menziesiiDouglas‐fir 16.0 Good Good 12 No Viable Remove New ROW Forked top150Alnus rubraRed alder 9.0 Good Good 16 No Viable Remove New ROW151Pseudotsuga menziesiiDouglas‐fir 13.5 Good Good 13 No Viable Remove New ROW Lost top152Acer macrophyllumBigleaf maple 17.8 Good Good 30 No Viable Remove New ROW153Pseudotsuga menziesiiDouglas‐fir 21.9 Good Good 15 No Viable Remove New ROW Phototropic lean154Pseudotsuga menziesiiDouglas‐fir 6.4 Fair Fair 4 No Viable Remove New ROW Suppressed155Pseudotsuga menziesiiDouglas‐fir 8.0 Good Good 8 No Viable Remove New ROW Suppressed156Pseudotsuga menziesiiDouglas‐fir 24.8 Good Good 15 No Viable Remove New ROW Dead subdominant trunk157Pseudotsuga menziesiiDouglas‐fir 28.0 Good Good 17 No Viable Remove New ROW158Pseudotsuga menziesiiDouglas‐fir 25.5 Good Good 18 No Viable Remove New ROW Not on survey159Acer macrophyllumBigleaf maple 6.3 Good Good 16 No Viable Remove New ROW160Acer macrophyllumBigleaf maple 7.3 Good Good 20 No Viable Remove New ROW161Acer macrophyllumBigleaf maple 8.4 6.5, 5.3 Fair Fair 20 No Viable Remove New ROW Codominant trunk form162Acer macrophyllumBigleaf maple 14.6 Good Good 23 No Viable Remove Grading163Acer macrophyllumBigleaf maple 7.0 Good Good 12 No Viable Remove New ROW Dead codominant trunk164Alnus rubraRed alder 11.5 9.0, 7.1 Poor Poor 7 No Not ViableRemove New ROW Bark sloughingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 10 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes165Pseudotsuga menziesiiDouglas‐fir 7.0 Good Good 6 No Viable Remove New ROW166Populus trichocarpaBlack cottonwood 13.3 Good Good 16 No Viable Remove New ROW Broken top167Alnus rubraRed alder 8.8 Good Good 10 No Viable Remove New ROW Leaning168Pseudotsuga menziesiiDouglas‐fir 8.5 Good Good 9 No Viable Remove New ROW Thin crown169Acer macrophyllumBigleaf maple 12.8 Good Good 27 No Viable Remove New ROW170Acer macrophyllumBigleaf maple 21.6 14.5, 16 Good Good 24 No Viable Remove Grading Codominant trunk form, stilted roots171Alnus rubraRed alder 8.3 Good Good 18 No Viable Remove Grading Phototropic lean172Alnus rubraRed alder 11.3 Good Good 10 No Viable Remove Grading173Acer macrophyllumBigleaf maple 23.8 12, 8.2, 13.8, 12.8Good Good 27 No Viable Remove Grading Codominant trunk form174Acer macrophyllumBigleaf maple 9.9 Good Good 23 No Viable Remove Grading Phototropic to east175Acer macrophyllumBigleaf maple 7.5 Good Good 21 No Viable Remove Grading Phototropic to east176Acer macrophyllumBigleaf maple 45.4 23.2, 24, 20.5, 23Good Good 35 Yes Viable Remove Grading Codominant trunk form, slight decay at base177Pseudotsuga menziesiiDouglas‐fir 28.6 24.3, 15 Good Good 15 No Viable Remove Grading Codominant trunk form178Prunus emarginataBitter cherry 8.2 Good Good 20 No Viable Remove Grading179Prunus emarginataBitter cherry 16.0 Good Good 18 No Viable Remove Grading Broken top180Acer macrophyllumBigleaf maple 9.3 Good Good 18 No Viable Remove Grading Dead codominant trunk181Pseudotsuga menziesiiDouglas‐fir 11.1 Good Good 10 No Viable Remove Grading Broken top182Pseudotsuga menziesiiDouglas‐fir 15.5 Good Good 6 No Viable Remove Grading Bowed trunk formTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 11 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes183Pseudotsuga menziesiiDouglas‐fir 20.8 Good Good 17 No Viable Remove Grading184Pseudotsuga menziesiiDouglas‐fir 8.0 Fair Fair 6 No Viable Remove New ROW Suppressed185Pseudotsuga menziesiiDouglas‐fir 18.0 Good Good 16 No Viable Remove New ROW186Acer macrophyllumBigleaf maple 9.2 8.4, 3.7 Good Good 16 No Viable Remove New ROW Codominant187Pseudotsuga menziesiiDouglas‐fir 12.1 Good Good 15 No Viable Remove New ROW188Acer macrophyllumBigleaf maple 13.5 Good Good 25 No Viable Remove New ROW189Acer macrophyllumBigleaf maple 13.5 Good Good 25 No Viable Remove New ROW190Pseudotsuga menziesiiDouglas‐fir 21.4 Good Good 15 No Viable Remove Grading191Pseudotsuga menziesiiDouglas‐fir 11.1 Good Good 11 No Viable Remove Grading192Pseudotsuga menziesiiDouglas‐fir 18.6 Good Good 18 No Viable Remove Grading Bowed trunk193Pseudotsuga menziesiiDouglas‐fir 7.4 Good Good 8 No Viable Remove Grading Broken top194Pseudotsuga menziesiiDouglas‐fir 13.5 Fair Fair 10 No Viable Remove Grading Broken top, epicormic sprouts, thin crown195Pseudotsuga menziesiiDouglas‐fir 9.5 Good Good 8 No Viable Remove Grading196Pseudotsuga menziesiiDouglas‐fir 16.0 Good Good 9 No Viable Remove Grading197Pseudotsuga menziesiiDouglas‐fir 11.6 Good Good 9 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 12 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes198Pseudotsuga menziesiiDouglas‐fir 9.4 Fair Fair 12 No Viable Remove Grading Broken top199Pseudotsuga menziesiiDouglas‐fir 15.9 Good Good 10 No Viable Remove Grading200Pseudotsuga menziesiiDouglas‐fir 15.0 Good Good 18 10 No Viable Remove Grading Broken top, low live crown ratio, concern over exposure from adjacentremovals.201Pseudotsuga menziesiiDouglas‐fir 15.0 Good Good 18 10 No Viable Remove Grading Broken top, low live crown ratio, concern over exposure from adjacentremovals.202Pseudotsuga menziesiiDouglas‐fir 15.0 Good Good 18 10 No Viable Remove Grading Broken top, low live crown ratio, concern over exposure from adjacentremovals.203Pseudotsuga menziesiiDouglas‐fir 13.0 Good Good 12 No Viable Remove Grading204Pseudotsuga menziesiiDouglas‐fir 9.5 Good Good 10 No Viable Remove Grading205Alnus rubraRed alder 12.5 Fair Fair 12 No Viable Remove Grading206Pseudotsuga menziesiiDouglas‐fir 16.8 Good Good 18 No Viable Remove Grading207Acer macrophyllumBigleaf maple 12.6 Good Good 20 No Viable Remove Grading208Pseudotsuga menziesiiDouglas‐fir 21.5 Good Good 22 No Viable Remove New ROW209Alnus rubraRed alder 11.0 Good Good 10 No Viable Remove New ROW Phototropic lean210Acer macrophyllumBigleaf maple 10.8 Good Good 17 No Viable Remove New ROWTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 13 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes211Pseudotsuga menziesiiDouglas‐fir 6.4 Fair Fair 6 No Viable Remove New ROW Suppressed, dead top212Pseudotsuga menziesiiDouglas‐fir 11.7 Good Good 15 No Viable Remove New ROW213Acer macrophyllumBigleaf maple 7.6 Good Good 16 No Viable Remove New ROW214Acer macrophyllumBigleaf maple 20.3 17, 6.5, 9 Good Good 30 No Viable Remove New ROW Codominant trunk form215Acer macrophyllumBigleaf maple 11.5 Good Good 19 No Viable Remove New ROW216Alnus rubraRed alder 16.0 Good Good 13 11 No Viable Retain East side of utility easement217Alnus rubraRed alder 12.0 Poor Fair 21 8 No Not ViableRetain Bark separated, large wounds in canopy, several dead branches218Alnus rubraRed alder 13.1 7.9, 10.4 Good Good 12 9 No Viable Retain Codominant, dead trunk219Alnus rubraRed alder 12.1 Poor Poor 10 No Not ViableRetain Grading Dead top220Pseudotsuga menziesiiDouglas‐fir 18.3 Good Good 22 No Viable Remove Grading221Pseudotsuga menziesiiDouglas‐fir 23.7 Good Good 22 No Viable Remove Grading222Prunus emarginataBitter cherry 7.7 Good Good 13 No Viable Remove Grading223Prunus emarginataBitter cherry 7.3 Good Good 8 5 No Viable Retain224Prunus emarginataBitter cherry 8.0 Good Good 10 5 No Viable Retain225Prunus emarginataBitter cherry 14.9 Poor Poor 12 No Not ViableRemove Grading Dying at top226Prunus emarginataBitter cherry 7.2 Good Good 6 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 14 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes227Acer macrophyllumBigleaf maple 16.9 7.1, 12.7, 8.5Good Good 25 No Viable Remove Grading Codominant trunk228Prunus emarginataBitter cherry 10.2 Good Good 18 No Viable Remove Grading229Acer macrophyllumBigleaf maple 19.0 Good Good 32 No Viable Remove Grading230Prunus emarginataBitter cherry 9.4 Good Good 10 No Viable Remove Grading Codominant at 15'231Pseudotsuga menziesiiDouglas‐fir 23.3 Good Good 18 No Viable Remove Grading232Crataegus monogynaCommon hawthorne 9.4 5.4, 6, 4.9 Good Good 19 No Viable Remove Grading Codominant, previous trunk failure, not on survey233Pseudotsuga menziesiiDouglas‐fir 26.0 Good Good 18 17 No Viable Retain Not on survey234Acer macrophyllumBigleaf maple 46.2 Good Good 35 31 Yes Viable Retain Measured at narrowest point below union, not on survey ‐ likely in tree preservation area ‐ confirm location. 1/21/2019 ‐ approximate location confirmed on map235Acer macrophyllumBigleaf maple 24.6 Good Good 18 16 No Viable Retain Subdominant stem at 7'236Acer macrophyllumBigleaf maple 15.1 Fair Fair 30 10 No Viable Retain Canopy mostly to east, dead codominant trunk237Acer macrophyllumBigleaf maple 25.4 Good Good 31 17 No Viable Retain Narrowly attached codominant stem, measured at narrowest point below unionTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 15 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes238Acer macrophyllumBigleaf maple 26.7 Poor Poor 23 No Not ViableRemove Grading Large tear out, dieback in canopy, saw damage239Acer macrophyllumBigleaf maple 17.3 14.3, 9.7 Good Good 27 No Viable Remove Grading Dead tree resting in canopy240Acer macrophyllumBigleaf maple 18.9 Fair Fair 23 No Viable Remove Grading Dieback in canopy, stem kink241Acer macrophyllumBigleaf maple 14.4 Good Good 24 No Viable Remove Grading Phototropic, dieback242Cornus nuttaliiPacific dogwood 6.4 Good Good 12 No Viable Remove Grading Dieback in canopy, suppressed243Acer macrophyllumBigleaf maple 15.7 Good Good 18 No Viable Remove Grading Dieback in canopy244Acer macrophyllumBigleaf maple 12.4 Good Good 19 No Viable Remove Grading Dieback in canopy245Acer macrophyllumBigleaf maple 10.2 Good Good 14 No Viable Remove Grading Phototropic246Acer macrophyllumBigleaf maple 7.6 Good Good 14 No Viable Remove Grading Not on survey247Acer macrophyllumBigleaf maple 20.1 Good Good 30 No Viable Remove Grading248Acer macrophyllumBigleaf maple 28.5 Good Good 32 No Viable Remove Grading Couple mechanical wounds249Acer macrophyllumBigleaf maple 10.0 Good Good 21 No Viable Remove Grading Canopy to east, suppressed250Acer macrophyllumBigleaf maple 13.3 Good Good 22 No Viable Remove Grading Dieback in canopy251Acer macrophyllumBigleaf maple 10.4 Good Good 19 No Viable Remove Grading Dead subdominant stem at base252Acer macrophyllumBigleaf maple 22.0 Good Good 18 11 No Viable Retain Grading 3 sprouts from prostrate tree, stilted roots, assess grading impacts. Maintain LOD.Tree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 16 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes253Acer macrophyllumBigleaf maple 35.7 Fair Poor 36 18 Yes Not ViableRetain Grading Large wounds with decay. Recent 22" failure has left large cavity. If house within striking range, tree is a high risk. There is only landscape within striking range, low risk. Maintain LOD.254Acer macrophyllumBigleaf maple 17.4 Good Good 38 12 No Viable Retain Phototropic southeast255Acer macrophyllumBigleaf maple 22.2 Good Good 26 15 No Viable Retain Twisting codominant stem, measured at narrowest point below union. Maintain LOD.256Pseudotsuga menziesiiDouglas‐fir 10.7 Good Good 12 No Viable Remove Grading257Acer macrophyllumBigleaf maple 19.9 Good Good 20 No Viable Remove Grading258Acer macrophyllumBigleaf maple 12.8 Good Good 19 No Viable Remove Grading Two dead subdominant stems259Acer macrophyllumBigleaf maple 14.2 Good Good 18 No Viable Remove Grading260Pseudotsuga menziesiiDouglas‐fir 8.0 Fair Fair 11 No Viable Remove Grading Suppressed, adjacent to 261261Acer macrophyllumBigleaf maple 22.2 18.1, 12.9 Good Good 29 No Viable Remove Grading Codominant from baseTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 17 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes262Acer macrophyllumBigleaf maple 7.1 Fair Fair 7 No Viable Retain Grading Suppressed, dieback with decay. Adjacent removals will leave tree exposed. Maintain LOD.263Acer macrophyllumBigleaf maple 13.2 9.9, 4, 7.8 Fair Fair 15 9 No Viable Retain Grading 1 dead codominant trunk, 3 live trunks at base. Maintain LOD.264Acer macrophyllumBigleaf maple 12.5 Good Good 19 8 No Viable Retain265Acer macrophyllumBigleaf maple 8.4 Good Good 17 6 No Viable Retain266Acer macrophyllumBigleaf maple 7.0 Fair Fair 18 5 No Viable Retain Reiteration from damaged tree, strange structure267Acer macrophyllumBigleaf maple 10.7 Good Good 17 7 No Viable Retain Stem girdling root, suppressed268Acer macrophyllumBigleaf maple 25.6 Good Good 26 17 No Viable Retain269Acer macrophyllumBigleaf maple 12.1 Good Good 18 8 No Viable Retain Swept base, codominant stem270Acer macrophyllumBigleaf maple 8.0 Good Good 16 5 No Viable Retain Lost top, on property line271Acer macrophyllumBigleaf maple 13.0 9.6, 8.7 Good Good 18 9 No Viable Retain On property line, codominant272Acer macrophyllumBigleaf maple 8.5 DEAD DEAD 6 No Not ViableRetain Removed girdling wire, suppressed with dieback present. Update 1/18/2019 ‐ No buds or fine branches, treeisdeadTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 18 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes273Acer macrophyllumBigleaf maple 30.5 Good Good 25 20 Yes Viable Retain On property line, codominant, measured at narrowest point below union; survey id 21242274Acer macrophyllumBigleaf maple 24.5 Good Good 32 16 No Viable Retain On property line, excellent Douglas‐fir to south, to be retained275Acer macrophyllumBigleaf maple 21.8 7.2, 13, 16, 12.4, 9Good Good 33 15 No Viable Retain Stump sprouts, multiple stems, one dead276Acer macrophyllumBigleaf maple 11.9 Good Good 25 8 No Viable Retain277Prunus emarginataBitter cherry 8.7 Good Good 20 6 No Viable Retain Heavy lean278Acer macrophyllumBigleaf maple 6.1 Fair Fair 4 No Viable Retain Wounds, decay, dieback279Acer macrophyllumBigleaf maple 10.4 Good Good 24 7 No Viable Retain Dead codominant stem, decayed280Acer macrophyllumBigleaf maple 6.3 Fair Fair 12 4 No Viable Retain Significant dieback, subdominant stem281Acer macrophyllumBigleaf maple 17.6 Good Good 21 12 No Viable Retain282Acer macrophyllumBigleaf maple 19.1 Good Good 21 13 No Viable Retain 3 stems narrowly attached and twisting, measured at narrowest point below unionTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 19 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes283Pseudotsuga menziesiiDouglas‐fir 19.9 Good Good 16 13 No Viable Remove Grading Survey shows tree closer to disturbance than in field. If 284 is retained, 283 could be aswell.284Acer macrophyllumBigleaf maple 21.6 16.3, 14.2, 12.1Good Good 29 11 No Viable Remove Grading 3 codominant at base, small dead trunk in union. Maintain LOD.285Acer macrophyllumBigleaf maple 15.9 7.6, 9.8, 7.3, 6.7Fair Fair 17 11 No Viable Retain Fallen tree with 4 large spouts and two dead, same tree as 21281 and 21283286Acer macrophyllumBigleaf maple 18.2 Good Good 18 12 No Viable Retain Codominant with weak union, dead codominant trunk 13", nearby untagged tree (3 codominant stems) is dead287Acer macrophyllumBigleaf maple 11.3 Fair Fair 16 No Viable Remove Grading Swept base, dieback, chlorotic288Acer macrophyllumBigleaf maple 15.1 10.9, 10.4 Good Good 20 No Viable Remove Grading Narrow attachment, codominant289Acer macrophyllumBigleaf maple 15.7 Good Good 35 No Viable Remove Grading Girdling root, swept base, asymmetric to East290Acer macrophyllumBigleaf maple 17.5 6.3, 3, 16 Good Good 30 No Viable Remove Grading Codominant with smaller 2 subdominant stems 291Pseudotsuga menziesiiDouglas‐fir 23.7 Good Good 28 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 20 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes292Pseudotsuga menziesiiDouglas‐fir 20.4 Good Good 18 No Viable Remove Grading293Pseudotsuga menziesiiDouglas‐fir 19.9 Good Good 24 No Viable Remove Grading294Acer macrophyllumBigleaf maple 8.7 Good Good 16 No Viable Remove Grading Growing out of base of 295, swept295Pseudotsuga menziesiiDouglas‐fir 24.5 Good Good 22 No Viable Remove Grading 294 growing from base296Pseudotsuga menziesiiDouglas‐fir 8.6 Fair Fair 15 No Viable Remove Grading Suppressed, lost top297Pseudotsuga menziesiiDouglas‐fir 26.1 Good Good 25 No Viable Remove Grading298Acer macrophyllumBigleaf maple 15.0 Good Good 18 No Viable Remove Grading299Acer macrophyllumBigleaf maple 9.1 Good Good 18 No Viable Remove Grading300Acer macrophyllumBigleaf maple 6.7 Fair Fair 12 No Viable Remove Grading Phototropic, 5 degree lean, not on survey301Acer macrophyllumBigleaf maple 23.8 10.4, 16, 14.3Good Good 34 No Viable Remove Grading 3 codominant trunks302Acer macrophyllumBigleaf maple 10.7 Fair Fair 15 7 No Viable Retain Decay at base, swept base, wounds303Acer macrophyllumBigleaf maple 15.0 Good Good 20 10 No Viable Retain Swept base304Acer macrophyllumBigleaf maple 15.8 10.7, 11.6 Good Good 25 11 No Viable Retain Swept base, codominant at base with narrow attachment, survey id 21249305Acer macrophyllumBigleaf maple 12.3 Good Good 20 8 No Viable Retain Asymmetry in crown. Maintain LOD.Tree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 21 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes306Acer macrophyllumBigleaf maple 15.8 Good Good 13 8 No Viable Retain Measured at narrowest point below union, codominant, narrow attachment307Acer macrophyllumBigleaf maple 11.7 8.5, 8 Good Good 16 8 No Viable Retain Grading Dead subdominant stem. Grows in tight cluster with trees 305, 306. If other two are retained, this can be too. If others are removed, this should be too308Acer macrophyllumBigleaf maple 9.5 Good Good 15 No Viable Remove Grading Swept, codominant with wound309Acer macrophyllumBigleaf maple 10.4 7.6, 7.1 Good Good 14 No Viable Remove Grading Wound, codominant, not on survey310Acer macrophyllumBigleaf maple 30.8 Fair Fair 27 Yes Viable Remove Grading Measured at narrowest point below union, 6 stems 3 are dead, narrowly attached311Acer macrophyllumBigleaf maple 7.9 Fair Fair 15 No Viable Remove Grading Dead leading stem at 20ft312Acer macrophyllumBigleaf maple 31.7 30.9, 7 Fair Fair 33 Yes Viable Remove Grading Large dead branches in canopy, significant decay313Acer macrophyllumBigleaf maple 12.4 11.3, 5.2 Good Good 16 No Viable Remove Grading Swept base, diebackTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 22 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes314Acer macrophyllumBigleaf maple 11.7 Fair Fair 15 No Viable Remove Grading Dead basal subdominant, phototropic lean, not onsurvey315Acer macrophyllumBigleaf maple 10.3 10.3 Fair Fair 14 No Viable Remove Grading Narrowly attached stems with rubbing, thin canopy316Acer macrophyllumBigleaf maple 12.2 7.5, 7.9, 5.5Fair Fair 21 No Viable Remove Grading Canopy dieback, codominant317Acer macrophyllumBigleaf maple 16.1 14, 8 Good Good 24 11 No Viable Retain Codominant at base, narrow attachment318Acer macrophyllumBigleaf maple 25.2 Good Good 27 17 No Viable Retain Stilted roots on one side319Acer macrophyllumBigleaf maple 8.7 Good Good 15 6 No Viable Retain Small dead subdominant stem, not on survey320Acer macrophyllumBigleaf maple 15.3 13.4, 7.4 Good Good 23 10 No Viable Retain Measured at narrowest point below union, rubbing trunks, narrow attachment321Acer macrophyllumBigleaf maple 20.7 Good Good 24 14 No Viable Retain Measured at narrowest point below union, codominant322Acer macrophyllumBigleaf maple 40.8 Poor Poor 27 Yes Not ViableRetain Grading Dead large branches, thinning canopy, east side tag 323Acer macrophyllumBigleaf maple 22.4 21.3, 6.9 Good Good 27 15 No Viable Retain Wounds healed over, small subdominant stemTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 23 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes324Acer macrophyllumBigleaf maple 28.1 Fair Fair 24 19 No Not ViableRetain Codominant, little bit of ivy on stem, large dead trunk 15' with crack325Acer macrophyllumBigleaf maple 14.4 4, 8.7, 8, 7.2, 17, 9.5, 2, 3, 1, 1Good Good 23 8 No Viable Retain Ivy growing up tree, multiple codominant trunks, stump sprout. MaintainLOD.326Acer macrophyllumBigleaf maple 13.2 3,3,6,5.5,6,7,2Good Good 9 No Viable Retain Stump sprout327Acer macrophyllumBigleaf maple 8.3 6.5, 2,2,3,3,1,1,1,2,4Fair Fair 15 6 No Viable Retain Stump sprout328Acer macrophyllumBigleaf maple 7.3 Good Good 21 5 No Viable Remove Grading No proposed grading or demolition planned for this area.329Acer macrophyllumBigleaf maple 10.7 6.2, 6.4, 4, 4, 2Good Good 22 7 No Viable Remove Grading Stump sprout. No proposed grading or demolition planned for thisarea.330Thuja plicataWestern redcedar 18.1 Good Good 17 12 No Viable Remove Grading Topped for utilities. No proposed grading or demolition planned for thisarea.331Pinus contorta var. contortaShore pine 13.1 Good Good 12 No Viable Remove Grading Codominant at 5', near utilities332Pinus contorta var. contortaShore pine 11.9 Fair Fair 10 No Not ViableRemove Grading Codominant, near utilitiesTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 24 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes333Crataegus monogynaCommon hawthorne 13.8 9.8, 8.2, 5.2Good Good 17 No Viable Remove Grading334Malus domesticaCommon apple 14.7 Good Good 16 No Viable Remove Grading Sap sucker activity. No proposed grading or demolition planned for thisarea.335Acer macrophyllumBigleaf maple 60.7 Good Fair 35 25 Yes Viable Remove Grading 12" root cut to West, great crown structure, test if retained. No proposed grading or demolition planned for thisarea336Malus domesticaCommon apple 7.0 Fair Fair 11 5 No Viable Retain337Prunus domesticaCommon plum 7.9 Fair Fair 11 5 No Viable Retain338Malus domesticaCommon apple 7.6 Fair Fair 9 No Viable Retain Grading No proposed grading or demolition planned for this area.339Malus domesticaCommon apple 16.8 Good Good 19 8 No Viable Retain Maintain LOD. 340Prunus domesticaCommon plum 6.6 Poor Poor 11 No Not ViableRemove Grading Not on survey341Acer macrophyllumBigleaf maple 13.0 7,10.9 Fair Fair 23 No Viable Remove Grading Growing at base of 342, phototropic342Pseudotsuga menziesiiDouglas‐fir 21.8 Good Good 14 No Viable Remove Grading Large girdling root343Acer macrophyllumBigleaf maple 15.9 11.5, 11 Good Good 30 No Viable Remove Grading Phototropic344Acer macrophyllumBigleaf maple 14.6 Good Good 30 No Viable Remove Grading Phototropic, one dead trunk, survey id 21100345Acer macrophyllumBigleaf maple 12.4 Good Good 17 No Viable Remove Grading SproutingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 25 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes346Acer macrophyllumBigleaf maple 10.4 Good Good 19 No Viable Remove Grading Lower dead parts, shaded347Acer macrophyllumBigleaf maple 12.6 Good Good 28 No Viable Remove Grading Lower dead parts, shaded348Acer macrophyllumBigleaf maple 18.4 Good Good 26 No Viable Remove Grading349Acer macrophyllumBigleaf maple 9.4 Fair Fair 24 No Viable Remove Grading Crown dieback, suppressed350Acer macrophyllumBigleaf maple 9.8 Fair Fair 21 No Viable Remove Grading Crown dieback, suppressed351Acer macrophyllumBigleaf maple 7.5 Fair Fair 27 No Viable Remove Grading Broken top, one sided crown 352Acer macrophyllumBigleaf maple 11.3 Good Good 20 No Viable Remove Grading Kink at base353Pseudotsuga menziesiiDouglas‐fir 6.7 Good Good 9 No Viable Remove Grading Young tree ‐ not on survey354Acer macrophyllumBigleaf maple 17.0 Good Good 25 No Viable Remove Grading355Pseudotsuga menziesiiDouglas‐fir 9.0 Good Good 10 No Viable Remove Grading Kink at 25', high live crown ratio356Pseudotsuga menziesiiDouglas‐fir 17.7 Good Good 19 No Viable Remove Grading High live crown ratio357Pseudotsuga menziesiiDouglas‐fir 14.5 Good Good 15 No Viable Remove Grading High live crown ratio358Acer macrophyllumBigleaf maple 12.8 Good Good 24 No Viable Remove Grading Large elbow branch structure359Pseudotsuga menziesiiDouglas‐fir 13.4 Good Good 15 No Viable Remove Grading High live crown ratio, shared crown with firs360Pseudotsuga menziesiiDouglas‐fir 20.3 Good Good 17 No Viable Remove Grading High live crown ratio, shared crown with firsTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 26 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes361Pseudotsuga menziesiiDouglas‐fir 23.8 Good Good 25 No Viable Remove Grading High live crown ratio, shared crown with firs362Pseudotsuga menziesiiDouglas‐fir 10.8 Good Good 15 No Viable Remove Grading High live crown ratio, shared crown with firs, suppressed363Pseudotsuga menziesiiDouglas‐fir 16.7 Good Good 14 No Viable Remove Grading High live crown ratio, shared crown with firs364Prunus emarginataBitter cherry 7.5 Fair Fair 12 No Viable Remove Grading Dead parts365Alnus rubraRed alder 9.9 Fair Fair 15 No Viable Remove Grading Phototropic, thin crown366Acer macrophyllumBigleaf maple 16.6 Good Good 24 No Viable Remove Grading Broken trunk, suppressed, measured at narrowest point below union367Acer macrophyllumBigleaf maple 7.5 Good Good 20 No Viable Remove Grading368Pseudotsuga menziesiiDouglas‐fir 18.7 Good Good 16 No Viable Remove Grading High live crown ratio369Acer macrophyllumBigleaf maple 6.0 Good Good 12 No Viable Remove Grading370Acer macrophyllumBigleaf maple 18.0 Good Good 22 No Viable Remove Grading371Acer macrophyllumBigleaf maple 21.6 12.1, 12, 11, 7.4Good Good 21 No Viable Remove Grading Codominant at base372Acer macrophyllumBigleaf maple 12.7 Good Good 20 No Viable Remove Grading Crossing trunks373Acer macrophyllumBigleaf maple 16.7 Good Good 22 No Viable Remove Grading Slight dieback374Acer macrophyllumBigleaf maple 15.9 Good Good 18 No Viable Remove Grading survey id 21146375Acer macrophyllumBigleaf maple 12.6 Good Good 19 No Viable Remove Grading Codominant union with included bark376Acer macrophyllumBigleaf maple 12.3 Fair Fair 25 No Viable Remove Grading Thin crown, small leaf size, chloroticTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 27 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes377Acer macrophyllumBigleaf maple 12.2 Good Good 13 No Viable Remove Grading378Acer macrophyllumBigleaf maple 12.9 Good Good 17 No Viable Remove Grading379Acer macrophyllumBigleaf maple 8.4 Fair Fair 15 No Viable Remove Grading One side of crown dead380Acer macrophyllumBigleaf maple 16.7 Good Good 24 No Viable Remove Grading381Acer macrophyllumBigleaf maple 15.2 Good Good 23 No Viable Remove Grading382Acer macrophyllumBigleaf maple 10.3 Fair Fair 17 No Viable Remove Grading383Acer macrophyllumBigleaf maple 12.3 9.0, 8.4 Fair Fair 20 No Viable Remove Grading384Acer macrophyllumBigleaf maple 18.7 Good Good 22 No Viable Remove Grading385Acer macrophyllumBigleaf maple 8.2 Fair Fair 15 No Viable Remove Grading Thin crown386Acer macrophyllumBigleaf maple 7.7 Poor Poor 6 No Not ViableRemove Grading Broken top, sprouting387Acer macrophyllumBigleaf maple 11.6 Good Good 16 No Viable Remove Grading388Acer macrophyllumBigleaf maple 14.3 Good Good 25 No Viable Remove Grading Dead parts389Acer macrophyllumBigleaf maple 6.6 Good Good 12 No Viable Remove Grading390Acer macrophyllumBigleaf maple 9.8 Good Good 17 No Viable Remove Grading391Acer macrophyllumBigleaf maple 6.9 Fair Fair 10 No Viable Remove Grading Thin crown, suppressed392Acer macrophyllumBigleaf maple 8.7 Good Good 18 No Viable Remove Grading393Acer macrophyllumBigleaf maple 12.1 Good Good 12 No Viable Remove Grading One sided crown 394Acer macrophyllumBigleaf maple 10.5 Good Good 20 No Viable Remove Grading395Acer macrophyllumBigleaf maple 14.7 Good Good 20 No Viable Remove Grading396Pseudotsuga menziesiiDouglas‐fir 18.5 Good Good 12 No Viable Remove Grading High live crown ratio397Acer macrophyllumBigleaf maple 9.2 Good Good 20 No Viable Remove Grading Swept base398Acer macrophyllumBigleaf maple 7.7 Good Good 20 No Viable Remove Grading399Acer macrophyllumBigleaf maple 9.9 Fair Fair 20 No Viable Remove Grading Growing under fallen maple400Acer macrophyllumBigleaf maple 9.4 Good Good 16 No Viable Remove Grading401Acer macrophyllumBigleaf maple 11.2 Good Good 17 No Viable Remove Grading Crossing trunks402Acer macrophyllumBigleaf maple 18.7 Good Good 25 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 28 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes403Acer macrophyllumBigleaf maple 12.2 Good Good 20 No Viable Remove Grading Large rib of response wood up trunk, phototropic to north404Acer macrophyllumBigleaf maple 10.1 Good Good 25 No Viable Remove Grading Crown suppressed, crown one sided to north405Acer macrophyllumBigleaf maple 10.0 Good Good 15 No Viable Remove Grading406Acer macrophyllumBigleaf maple 15.4 Good Good 18 No Viable Remove Grading Kink in trunk407Acer macrophyllumBigleaf maple 11.2 Good Good 18 No Viable Remove Grading Crown one sided408Acer macrophyllumBigleaf maple 16.7 Good Good 17 No Viable Remove Grading409Acer macrophyllumBigleaf maple 11.8 Poor Poor 2 No Not ViableRemove Grading Broken top, barely alive410Acer macrophyllumBigleaf maple 10.6 Fair Fair 15 No Viable Remove Grading Broken top with new reiteration 411Acer macrophyllumBigleaf maple 11.8 Good Good 16 No Viable Remove Grading412Acer macrophyllumBigleaf maple 10.1 Fair Fair 23 No Viable Remove Grading Broken top413Pseudotsuga menziesiiDouglas‐fir 10.4 Fair Fair 10 No Viable Remove Grading Broken top, dieback414Acer macrophyllumBigleaf maple 8.2 Fair Fair 11 No Viable Remove Grading Thin crown415Acer macrophyllumBigleaf maple 14.7 12.4, 7.9 Good Good 15 No Viable Remove Grading416Acer macrophyllumBigleaf maple 19.7 Good Good 22 No Viable Remove Grading417Acer macrophyllumBigleaf maple 18.4 15.9, 9.2 Good Good 24 No Viable Remove Grading Broken parts throughout, phototropic to west418Pseudotsuga menziesiiDouglas‐fir 8.9 7.9, 4.1 Good Good 10 No Viable Remove Grading419Acer macrophyllumBigleaf maple 21.0 Good Good 20 No Viable Remove Grading Large codominant union with included bark 420Pseudotsuga menziesiiDouglas‐fir 12.3 Good Good 12 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 29 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes421Pseudotsuga menziesiiDouglas‐fir 8.5 Good Good 12 No Viable Remove Grading422Acer macrophyllumBigleaf maple 12.4 Good Good 15 No Viable Remove Grading423Acer macrophyllumBigleaf maple 6.0 Fair Fair 10 No Viable Remove Grading One sided crown, suppressed424Acer macrophyllumBigleaf maple 15.4 Good Good 25 No Viable Remove Grading425Acer macrophyllumBigleaf maple 8.1 Good Good 20 No Viable Remove Grading426Acer macrophyllumBigleaf maple 19.4 13.8, 13.6 Good Good 22 No Viable Remove Grading Large ivy on trunk427Pseudotsuga menziesiiDouglas‐fir 6.8 Good Good 8 No Viable Remove Grading Suppressed, not on survey428Acer macrophyllumBigleaf maple 9.5 Good Good 17 No Viable Remove Grading429Acer macrophyllumBigleaf maple 11.9 Good Good 16 No Viable Remove Grading430Pseudotsuga menziesiiDouglas‐fir 25.5 Good Good 19 No Viable Remove Grading431Acer macrophyllumBigleaf maple 7.7 Fair Fair 13 No Viable Remove Grading Thin crown 432Pseudotsuga menziesiiDouglas‐fir 13.8 Good Good 13 No Viable Remove Grading433Acer macrophyllumBigleaf maple 7.1 Fair Fair 18 No Viable Remove Grading Not on survey434Acer macrophyllumBigleaf maple 13.4 Good Good 18 No Viable Remove Grading435Acer macrophyllumBigleaf maple 9.9 Good Good 15 No Viable Remove Grading436Acer macrophyllumBigleaf maple 8.0 Good Good 13 No Viable Remove Grading Slightly suppressed437Pseudotsuga menziesiiDouglas‐fir 12.5 Good Good 15 No Viable Remove Grading438Acer macrophyllumBigleaf maple 18.4 Good Good 24 No Viable Remove Grading439Acer macrophyllumBigleaf maple 9.0 Good Good 17 No Viable Remove Grading440Acer macrophyllumBigleaf maple 11.5 Good Good 20 No Viable Remove Grading441Pseudotsuga menziesiiDouglas‐fir 11.9 Good Good 11 No Viable Remove Grading442Pseudotsuga menziesiiDouglas‐fir 15.4 Good Good 13 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 30 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes443Pseudotsuga menziesiiDouglas‐fir 12.0 Good Good 10 No Viable Remove Grading444Pseudotsuga menziesiiDouglas‐fir 14.2 Good Good 14 No Viable Remove Grading445Acer macrophyllumBigleaf maple 12.3 Good Good 13 No Viable Remove Grading446Acer macrophyllumBigleaf maple 19.0 11.2, 14.7, 4.5Good Good 25 No Viable Remove Grading Codominant at base447Acer macrophyllumBigleaf maple 6.8 Good Good 11 No Viable Remove Grading Slightly suppressed448Acer macrophyllumBigleaf maple 10.5 Good Good 22 No Viable Remove Grading449Acer macrophyllumBigleaf maple 8.4 Good Good 22 No Viable Remove Grading450Acer macrophyllumBigleaf maple 14.7 Good Good 25 No Viable Remove Grading451Acer macrophyllumBigleaf maple 13.9 10.1, 7.8, 5.5Good Good 23 No Viable Remove Grading Codominant at base452Alnus rubraRed alder 12.0 Fair Fair 15 No Viable Remove Grading Broken top453Pseudotsuga menziesiiDouglas‐fir 10.0 Good Good 8 No Viable Remove Grading454Pseudotsuga menziesiiDouglas‐fir 22.0 Good Good 18 No Viable Remove Grading455Acer macrophyllumBigleaf maple 7.4 Fair Fair 8 No Viable Remove Grading Crown dieback456Acer macrophyllumBigleaf maple 14.2 Good Good 28 No Viable Remove Grading Phototropic north457Acer macrophyllumBigleaf maple 17.3 Good Good 27 No Viable Remove Grading458Acer macrophyllumBigleaf maple 11.7 Fair Fair 11 No Viable Remove Grading Broken top459Acer macrophyllumBigleaf maple 21.1 13.1, 9, 8, 11.4Good Good 20 No Viable Remove Grading Codominant at base460Acer macrophyllumBigleaf maple 11.4 9.2, 6.7 Fair Fair 18 No Viable Remove Grading Dead trunk with dieback461Acer macrophyllumBigleaf maple 14.4 Good Good 24 No Viable Remove Grading462Acer macrophyllumBigleaf maple 12.1 Good Good 15 No Viable Remove Grading463Acer macrophyllumBigleaf maple 7.6 Fair Fair 18 No Viable Remove Grading Dieback464Acer macrophyllumBigleaf maple 10.7 Good Good 15 No Viable Remove Grading Dieback465Acer macrophyllumBigleaf maple 15.4 Good Good 28 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 31 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes466Acer macrophyllumBigleaf maple 9.0 Good Good 16 No Viable Remove Grading467Acer macrophyllumBigleaf maple 7.2 Good Good 18 No Viable Remove Grading Phototropic468Pseudotsuga menziesiiDouglas‐fir 18.6 Good Good 13 No Viable Remove Grading469Acer macrophyllumBigleaf maple 19.5 Good Good 30 No Viable Remove Grading Dieback470Acer macrophyllumBigleaf maple 6.4 Good Good 17 No Viable Remove Grading471Pseudotsuga menziesiiDouglas‐fir 25.5 Good Good 20 No Viable Remove Grading472Acer macrophyllumBigleaf maple 14.3 Fair Fair 16 No Viable Remove Grading Codominant with nose of tissue, healing wound473Acer macrophyllumBigleaf maple 15.1 10.6, 10.7 Fair Fair 18 No Viable Remove Grading474Acer macrophyllumBigleaf maple 7.8 Fair Fair 16 No Viable Remove Grading475Acer macrophyllumBigleaf maple 16.3 11.2, 11.8 Good Good 25 No Viable Remove Grading Codominant at base476Acer macrophyllumBigleaf maple 8.5 Good Good 18 No Viable Remove Grading Phototropic to southwest, not on survey477Acer macrophyllumBigleaf maple 37.5 Fair Fair 26 Yes Viable Remove Grading Large tearout, kretzschmaria, visible decay478Acer macrophyllumBigleaf maple 28.5 Good Good 40 No Viable Remove Grading Codominant trunk failure, phototropic to northwest479Acer macrophyllumBigleaf maple 29.1 25.9, 11, 5.2, 5.3Fair Fair 40 No Viable Remove Grading Large decay cavity at base, dieback480Thuja plicataWestern redcedar 25.2 Fair Fair 10 No Viable Remove Grading Dieback at top, dead top481Acer macrophyllumBigleaf maple 16.0 Good Good 17 No Viable Remove Grading482Acer macrophyllumBigleaf maple 18.0 Good Good 24 No Viable Remove Grading Crown somewhat sparse, included barkTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 32 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes483Thuja plicataWestern redcedar 8.5 Fair Fair 6 No Viable Remove Grading Dead top, not on survey484Pseudotsuga menziesiiDouglas‐fir 7.5 Fair Fair 7 No Viable Remove Grading Epicormic growth, dead top485Pseudotsuga menziesiiDouglas‐fir 18.0 Good Good 18 No Viable Remove Grading Top damaged with reiterations486Acer macrophyllumBigleaf maple 13.8 Good Good 22 No Viable Remove Grading487Acer macrophyllumBigleaf maple 12.9 Good Good 19 No Viable Remove Grading Kink in trunk488Acer macrophyllumBigleaf maple 11.0 Good Good 15 No Viable Remove Grading489Acer macrophyllumBigleaf maple 12.8 Good Good 21 No Viable Remove Grading490Acer macrophyllumBigleaf maple 9.6 Good Good 16 No Viable Remove Grading491Acer macrophyllumBigleaf maple 12.0 Good Good 20 No Viable Remove Grading492Acer macrophyllumBigleaf maple 6.4 Fair Fair 15 No Viable Remove Grading Phototropic lean to north493Pseudotsuga menziesiiDouglas‐fir 20.7 Good Good 14 No Viable Remove Grading494Acer macrophyllumBigleaf maple 6.5 Good Good 18 No Viable Remove Grading495Pseudotsuga menziesiiDouglas‐fir 16.9 Good Good 15 No Viable Remove Grading Kink in stem at 40', potential nest in canopy496Acer macrophyllumBigleaf maple 6.0 Good Good 10 No Viable Remove Grading497Acer macrophyllumBigleaf maple 6.5 Good Good 10 No Viable Remove Grading498Acer macrophyllumBigleaf maple 6.5 Good Good 13 No Viable Remove Grading499Acer macrophyllumBigleaf maple 6.5 Good Good 15 No Viable Remove Grading500Acer macrophyllumBigleaf maple 23.4 14.9, 18 Good Good 42 No Viable Remove Grading Codominant, many unions in upper canopy501Acer macrophyllumBigleaf maple 7.1 Fair Fair 12 No Viable Remove Grading Broken parts, chlorotic502Acer macrophyllumBigleaf maple 15.4 Good Good 24 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 33 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes503Acer macrophyllumBigleaf maple 6.2 Fair Fair 5 No Viable Remove Grading Dead top, not on survey504Acer macrophyllumBigleaf maple 23.1 16.6, 16 Good Good 28 No Viable Remove Grading Codominant at base505Acer macrophyllumBigleaf maple 29.3 19.4, 22 Good Good 40 No Viable Remove Grading Codominant at base506Acer macrophyllumBigleaf maple 9.3 Good Good 16 No Viable Remove Grading Tearout at base507Acer macrophyllumBigleaf maple 17.0 Good Good 20 No Viable Remove Grading508Acer macrophyllumBigleaf maple 8.8 Good Good 10 No Viable Remove Grading Broken top509Acer macrophyllumBigleaf maple 7.3 Good Good 12 No Viable Remove Grading510Acer macrophyllumBigleaf maple 6.9 Good Good 10 No Viable Remove Grading Swept base511Acer macrophyllumBigleaf maple 6.5 Fair Fair 10 No Viable Remove Grading512Acer macrophyllumBigleaf maple 24.3 15.7, 13, 13.3Good Good 38 No Viable Remove Grading Codominant at base, many dead branches, phototropic513Acer macrophyllumBigleaf maple 14.3 Good Good 30 No Viable Remove Grading514Acer macrophyllumBigleaf maple 7.6 Poor Poor 6 No Not ViableRemove Grading Very sparse foliage, poor growth515Crataegus monogynaCommon hawthorne 7.4 5.9, 4.5 Good Good 10 No Viable Remove Grading516Acer macrophyllumBigleaf maple 11.5 Poor Poor 20 No Not ViableRemove Grading Very sparse canopy, dead codominant trunk, little growth517Alnus rubraRed alder 12.2 Good Good 16 No Viable Remove Grading518Acer macrophyllumBigleaf maple 23.8 16.8, 16.8 Good Good 27 No Viable Remove Grading Codominant stems519Pseudotsuga menziesiiDouglas‐fir 21.3 Good Good 15 No Viable Remove Grading Sap flow around base520Pseudotsuga menziesiiDouglas‐fir 20.9 Good Good 16 No Viable Remove Grading Surface roots521Acer macrophyllumBigleaf maple 19.1 13.9, 13.1 Good Good 28 No Viable Remove Grading Codominant stems522Acer macrophyllumBigleaf maple 18.2 13.3, 12.4 Fair Fair 21 No Viable Remove Grading Codominant stems, 3rd stem removedTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 34 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes523Acer macrophyllumBigleaf maple 9.1 Poor Poor 16 No Not ViableRemove Grading Swept base, wound, dieback in canopy524Pseudotsuga menziesiiDouglas‐fir 26.6 Good Good 22 No Viable Remove Grading525Alnus rubraRed alder 11.0 Good Good 17 No Viable Remove Grading526Acer macrophyllumBigleaf maple 20.4 Good Good 30 No Viable Remove Grading527Pseudotsuga menziesiiDouglas‐fir 11.7 Good Good 14 No Viable Remove Grading528Acer macrophyllumBigleaf maple 8.1 Good Good 22 No Viable Remove Grading Phototropic to south529Acer macrophyllumBigleaf maple 6.0 Good Good 16 No Viable Remove Grading530Acer macrophyllumBigleaf maple 18.0 Good Good 27 No Viable Remove Grading Phototropic to south, codominant at 25531Acer macrophyllumBigleaf maple 16.4 Good Good 27 No Viable Remove Grading532Acer macrophyllumBigleaf maple 17.6 12.3, 10.2, 7.4Good Good 25 No Viable Remove Grading 3 dead stems533Acer macrophyllumBigleaf maple 7.5 Fair Fair 24 No Viable Remove Grading Codominant at 25'534Acer macrophyllumBigleaf maple 17.0 Good Good 26 No Viable Remove Grading535Pseudotsuga menziesiiDouglas‐fir 15.4 Good Good 18 No Viable Remove Grading536Acer macrophyllumBigleaf maple 11.9 Fair Fair 20 No Viable Remove Grading537Acer macrophyllumBigleaf maple 9.2 Good Good 12 No Viable Remove Grading538Acer macrophyllumBigleaf maple 11.7 6.7, 6.9, 6.7Fair Fair 30 No Viable Remove Grading Stump sprout, 3 dead stems539Acer macrophyllumBigleaf maple 13.1 12.2, 4.7 Good Good 18 No Viable Remove Grading 2 dead stems, stump sprout540Acer macrophyllumBigleaf maple 17.0 Good Good 32 No Viable Remove Grading541Acer macrophyllumBigleaf maple 6.0 Good Good 16 No Viable Remove Grading Wounding on stem542Acer macrophyllumBigleaf maple 8.8 6, 5, 4 Good Good 15 No Viable Remove Grading Stump sprout, 3 live stems543Acer macrophyllumBigleaf maple 13.5 Good Good 25 No Viable Remove Grading Codominant at 15'544Acer macrophyllumBigleaf maple 6.8 Good Good 19 No Viable Remove Grading Dead stem adjacentTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 35 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes545Acer macrophyllumBigleaf maple 21.0 10.5, 10.7, 10.5, 10.2Good Good 29 No Viable Remove Grading Codominant at base546Acer macrophyllumBigleaf maple 13.7 9.7, 9.7 Good Good 26 No Viable Remove Grading Phototropic to south, narrowly attached stems547Acer macrophyllumBigleaf maple 10.8 8.8, 6.2 Fair Fair 14 No Viable Remove Grading Codominant at 2'548Acer macrophyllumBigleaf maple 11.6 Good Good 21 No Viable Remove Grading 5 dead stems, codominant at base549Acer macrophyllumBigleaf maple 11.7 Good Good 20 No Viable Remove Grading Dead subdominant stem550Acer macrophyllumBigleaf maple 7.1 Fair Fair 18 No Viable Remove Grading Dead codominant stems, decay cavities551Acer macrophyllumBigleaf maple 14.6 Good Good 21 No Viable Remove Grading Measured at narrowest point below union552Acer macrophyllumBigleaf maple 14.1 9.4, 8.7, 6 Fair Fair 22 No Viable Remove Grading Stump sprout, 2 dead stems, visible decay553Acer macrophyllumBigleaf maple 18.1 10.4. 11.3. 9.5Good Good 26 No Viable Remove Grading554Acer macrophyllumBigleaf maple 17.7 8.2, 6.3, 6.1, 7.8, 10.4Fair Fair 28 No Viable Remove Grading Lots of decay555Acer macrophyllumBigleaf maple 6.3 Poor Poor 32 No Not ViableRemove Grading Stump sprout556Acer macrophyllumBigleaf maple 21.2 Good Good 28 No Viable Remove Grading Large cavity at base, dead codominant stem, measured at narrowest point below unionTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 36 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes557Acer macrophyllumBigleaf maple 14.1 Good Good 12 No Viable Remove Grading Garlic mustard at base, kink in stem558Acer macrophyllumBigleaf maple 16.4 Good Good 22 11 No Viable Retain Large canker559Acer macrophyllumBigleaf maple 13.6 Fair Fair 26 9 No Not ViableRetain Thin canopy560Acer macrophyllumBigleaf maple 18.6 14.8, 11.2 Fair Fair 23 12 No Not ViableRetain Codominant at base, column of decay561Thuja plicataWestern redcedar 20.6 Good Good 11 14 No Viable Retain562Acer macrophyllumBigleaf maple 11.2 Poor Poor 17 7 No Not ViableRetain Grading Lots of wounding at base, kretzschmaria563Acer macrophyllumBigleaf maple 25.8 13.5, 15.3, 15.8Good Good 33 17 No Viable Retain Codominant at base, wound with decay, garlic mustard564Acer macrophyllumBigleaf maple 9.8 Good Good 15 7 No Viable Retain Grading565Acer macrophyllumBigleaf maple 12.5 Good Good 29 8 No Viable Retain Grading Occluded wound566Acer macrophyllumBigleaf maple 15.0 Good Good 27 10 No Viable Retain567Acer macrophyllumBigleaf maple 20.5 13.5, 15.4 Good Good 28 14 No Viable Retain Codominant at base, garlic mustard in area568Pseudotsuga menziesiiDouglas‐fir 20.6 Good Good 14 No Viable Retain Lost top569Acer macrophyllumBigleaf maple 10.0 Fair Fair 27 7 No Not ViableRetain Codominant stems, 1 dead570Malus domesticaCommon apple 13.4 7, 9.2, 6.7 Fair Fair 12 9 No Not ViableRemove Grading Apple scabTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 37 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes571Acer macrophyllumBigleaf maple 15.2 9.4, 12 Fair Fair 23 10 No Not ViableRetain Kretzschmaria, narrow attachment 572Acer macrophyllumBigleaf maple 14.9 Good Good 18 10 No Viable Retain573Acer macrophyllumBigleaf maple 14.0 Fair Fair 13 9 No Not ViableRetain Wound at base, decay visible574Alnus rubraRed alder 17.3 Good Good 21 12 No Viable Retain Not on survey575Alnus rubraRed alder 9.3 Good Good 10 6 No Viable Retain Not on survey576Alnus rubraRed alder 12.7 Fair Fair 10 8 No Not ViableRetain Large wound, not on survey577Alnus rubraRed alder 18.0 Good Good 19 12 No Viable Retain Not on survey578Pseudotsuga menziesiiDouglas‐fir 7.0 Good Good 9 5 No Viable Retain Not on survey579Acer macrophyllumBigleaf maple 7.9 Poor Poor 8 5 No Not ViableRemove Grading Dead codominant stem580Acer macrophyllumBigleaf maple 15.2 8.4, 12.7 Good Good 30 10 No Viable Retain Codominant at base, wide attachment581Pseudotsuga menziesiiDouglas‐fir 11.9 Fair Fair 16 8 No Not ViableRetain Lost top at 15', 2 reiterations582Acer macrophyllumBigleaf maple 29.8 Good Good 22 20 No Viable Retain Codominant stems at 10', large wound with response growth583Pseudotsuga menziesiiDouglas‐fir 14.6 Good Good 19 10 No Viable Retain Slightly swept base, garlic mustard in area584Alnus rubraRed alder 12.0 Poor Poor 13 8 No Not ViableRemove Grading Significant decay, poor canopy structureTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 38 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes585Pseudotsuga menziesiiDouglas‐fir 13.0 Good Good 18 9 No Viable Retain Lost top, 3 new leaders586Alnus rubraRed alder 27.3 Good Good 24 18 No Viable Retain587Acer macrophyllumBigleaf maple 31.4 Poor Poor 31 21 Yes Not ViableRemove Grading Significant dieback in canopy, kretzschmaria588Acer macrophyllumBigleaf maple 10.3 6.7, 5, 6 Good Good 15 7 No Viable Remove Grading Stump sprout589Acer macrophyllumBigleaf maple 15.0 Good Good 23 No Viable Remove Grading Dead subdominant stem590Acer macrophyllumBigleaf maple 16.6 10.4, 8, 10.2Good Good 21 No Viable Remove Grading Codominant at base591Acer macrophyllumBigleaf maple 7.8 Good Good 22 No Viable Remove Grading Some dieback592Acer macrophyllumBigleaf maple 7.6 Fair Fair 35 No Viable Remove Grading 2 dead stems, canopy all to north593Acer macrophyllumBigleaf maple 9.1 Good Good 23 No Viable Remove Grading594Acer macrophyllumBigleaf maple 11.5 Good Good 18 No Viable Remove Grading595Acer macrophyllumBigleaf maple 6.9 Fair Fair 11 No Viable Remove Grading596Acer macrophyllumBigleaf maple 6.6 Fair Fair 14 No Viable Remove Grading Lacking foliage, epicormic growth, canopy to north597Acer macrophyllumBigleaf maple 16.8 10.7, 12.9 Good Good 22 No Viable Remove Grading 2 stems at base, 1 dead subdominant598Acer macrophyllumBigleaf maple 14.4 10.3, 10 Good Good 30 No Viable Remove Grading Codominant at base599Acer macrophyllumBigleaf maple 7.7 Good Good 18 No Viable Remove Grading600Pseudotsuga menziesiiDouglas‐fir 14.8 Good Good 20 No Viable Remove Grading601Pseudotsuga menziesiiDouglas‐fir 19.6 Good Good 20 No Viable Remove Grading602Acer macrophyllumBigleaf maple 7.4 Fair Fair 23 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 39 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes603Acer macrophyllumBigleaf maple 7.8 Good Good 8 No Viable Remove Grading604Acer macrophyllumBigleaf maple 27.7 7.6, 9.2, 25 Good Good 35 No Viable Remove Grading Codominant at base, some decay605Acer macrophyllumBigleaf maple 21.5 18, 11.7 Good Good 32 No Viable Remove Grading Stilted roots, one big stem of dieback606Acer macrophyllumBigleaf maple 16.5 Fair Fair 27 No Viable Remove Grading Narrowly attached, measured at narrowest point below union, stems fusing607Acer macrophyllumBigleaf maple 6.9 Fair Fair 15 No Viable Remove Grading608Acer macrophyllumBigleaf maple 6.9 Good Good 16 No Viable Remove Grading609Acer macrophyllumBigleaf maple 6.9 Good Good 17 No Viable Remove Grading610Acer macrophyllumBigleaf maple 9.6 Good Good 26 No Viable Remove Grading611Pseudotsuga menziesiiDouglas‐fir 10.0 Good Good 16 No Viable Remove Grading612Acer macrophyllumBigleaf maple 16.8 12.3, 10.1, 2, 4, 3 Fair Fair 21 No Viable Remove Grading Thin canopy613Acer macrophyllumBigleaf maple 10.2 Good Good No Viable Remove Grading614Acer macrophyllumBigleaf maple 10.0 Fair Fair 17 No Viable Remove Grading615Alnus rubraRed alder 9.4 Good Good 20 No Viable Remove Grading616Alnus rubraRed alder 22.9 Good Good 32 No Viable Remove Grading Bulge at base, garlic mustard established in area617Pseudotsuga menziesiiDouglas‐fir 9.0 Fair Fair 12 No Viable Remove Grading Suppressed, lost top618Alnus rubraRed alder 14.2 Fair Fair 18 No Viable Remove New ROW619Alnus rubraRed alder 23.0 Fair Fair 24 No Viable Remove New ROWTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 40 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes620Pseudotsuga menziesiiDouglas‐fir 31.3 Good Good 22 Yes Viable Remove Grading621Acer macrophyllumBigleaf maple 7.1 6.8, 2 Good Good 16 No Viable Remove Grading Subdominant stem622Pseudotsuga menziesiiDouglas‐fir 15.8 Good Good 17 No Viable Remove Grading623Alnus rubraRed alder 12.8 Good Good 28 No Viable Remove Grading Fence grown into tree, leaning on 622624Alnus rubraRed alder 16.5 11.8, 11.5 Good Good 28 No Viable Remove Grading Codominant at base625Alnus rubraRed alder 12.1 Fair Fair 14 No Viable Remove Grading626Acer macrophyllumBigleaf maple 7.4 Good Good 19 No Viable Remove Grading627Acer macrophyllumBigleaf maple 6.4 Good Good 20 No Viable Remove Grading Dead tree leaning on trunk628Alnus rubraRed alder 11.1 Good Good 30 No Viable Remove Grading Phototropic to northwest, small canopy629Alnus rubraRed alder 12.0 Good Good 30 No Viable Remove Grading Birds nesting on trunk630Alnus rubraRed alder 15.6 Good Good 36 No Viable Remove Grading Phototropic to northwest, small canopy631Pseudotsuga menziesiiDouglas‐fir 14.2 Good Good 14 No Viable Remove Grading632Pseudotsuga menziesiiDouglas‐fir 7.2 Fair Fair 8 No Viable Remove Grading Suppressed, lost top633Acer macrophyllumBigleaf maple 9.7 Good Good 18 No Viable Remove Grading Kink in stem, canopy to north634Pseudotsuga menziesiiDouglas‐fir 11.0 5.4, 9.6 Fair Fair 15 No Viable Remove Grading Codominant635Acer macrophyllumBigleaf maple 10.4 Good Good 12 No Viable Remove Grading636Acer macrophyllumBigleaf maple 17.8 Good Good 24 No Viable Remove Grading637Pseudotsuga menziesiiDouglas‐fir 23.8 Good Good 21 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 41 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes638Acer macrophyllumBigleaf maple 13.8 Good Good 23 No Viable Remove Grading Codominant at 25'639Acer macrophyllumBigleaf maple 13.6 Good Good 26 No Viable Remove Grading Adjacent to 640640Acer macrophyllumBigleaf maple 15.3 Good Good 32 No Viable Remove Grading641Acer macrophyllumBigleaf maple 10.3 Good Good 30 No Viable Remove Grading Canopy to north642Acer macrophyllumBigleaf maple 7.2 Good Good 28 No Viable Remove Grading Suppressed, canopy top north, not on survey643Pseudotsuga menziesiiDouglas‐fir 15.3 Good Good 22 No Viable Remove Grading Fence growing into bark644Pseudotsuga menziesiiDouglas‐fir 21.3 Good Good 22 No Viable Remove Grading645Pseudotsuga menziesiiDouglas‐fir 23.9 Good Good 24 No Viable Remove Grading646Acer macrophyllumBigleaf maple 34.8 Fair Fair 35 Yes Viable Remove New ROW Lost stem at base, ganoderma conk, kretzschmaria647Pseudotsuga menziesiiDouglas‐fir 7.4 Poor Poor 6 No Not ViableRemove New ROW Suppressed648Pseudotsuga menziesiiDouglas‐fir 19.7 Good Good 21 No Viable Remove New ROW Kinks in stem649Pseudotsuga menziesiiDouglas‐fir 21.0 Good Good 23 No Viable Remove New ROW650Pseudotsuga menziesiiDouglas‐fir 13.8 Good Good 18 No Viable Remove New ROW Lost top651Pseudotsuga menziesiiDouglas‐fir 22.5 Good Good 20 No Viable Remove New ROW652Pseudotsuga menziesiiDouglas‐fir 13.7 Fair Fair 12 No Viable Remove New ROW Codominant at 20'653Pseudotsuga menziesiiDouglas‐fir 26.5 Good Good 30 No Viable Remove New ROWTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 42 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes654Pseudotsuga menziesiiDouglas‐fir 23.7 Good Good 26 No Viable Remove New ROW655Pseudotsuga menziesiiDouglas‐fir 27.0 Good Good 32 No Viable Remove Grading Bulge at base, measured below bulge, garlic mustard656Acer macrophyllumBigleaf maple 15.3 Good Good 26 No Viable Remove Grading Phototropic to northwest657Acer macrophyllumBigleaf maple 17.2 Good Good 28 No Viable Remove Grading Adjacent to 656658Acer macrophyllumBigleaf maple 28.0 Good Good 18 No Viable Remove Grading Measured at narrowest point below union659Acer macrophyllumBigleaf maple 21.6 Good Good 25 No Viable Remove Grading Dead subdominant660Acer macrophyllumBigleaf maple 26.0 13.6, 22, 18.5Fair Fair 26 No Viable Remove Grading 3 stems at 3 feet661Acer macrophyllumBigleaf maple 33.3 Good Good 28 Yes Viable Remove Grading Surface roots662Pseudotsuga menziesiiDouglas‐fir 26.3 Good Good 19 No Viable Remove Grading663Pseudotsuga menziesiiDouglas‐fir 30.4 Good Good 18 Yes Viable Remove Grading Bulge at base664Pseudotsuga menziesiiDouglas‐fir 26.0 Good Good 17 No Viable Remove Grading Not tagged, estimated from afar (surrounded by blackberry), edge tree, survey id 20555665Alnus rubraRed alder 25.5 11.7, 9, 14.5, 13, 7.2Good Good 23 No Viable Remove Grading 1 dead stem, not on survey666Alnus rubraRed alder 23.7 11.7, 9.8, 9.8, 10.5, 11Good Good 35 No Viable Remove Grading 2 dead stems, dieback in canopy, not on surveyTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 43 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes667Pseudotsuga menziesiiDouglas‐fir 16.0 Good Good 20 No Viable Remove Grading Lost top668Pseudotsuga menziesiiDouglas‐fir 31.8 Good Good 21 Yes Viable Remove Grading Measured at narrowest point below union, codominant at 3, narrowly attached669Pseudotsuga menziesiiDouglas‐fir 18.4 Good Good 18 No Viable Remove Grading670Pseudotsuga menziesiiDouglas‐fir 15.4 Good Good 18 No Viable Remove Grading671Pseudotsuga menziesiiDouglas‐fir 12.7 Fair Fair 13 No Viable Remove Grading Sparse canopy672Pseudotsuga menziesiiDouglas‐fir 21.2 Good Good 19 No Viable Remove Grading Lost top673Pseudotsuga menziesiiDouglas‐fir 14.6 Good Good 17 No Viable Remove Grading Lost top674Pseudotsuga menziesiiDouglas‐fir 22.3 Good Good 20 No Viable Remove New ROW Dead tree leaning on trunk675Pseudotsuga menziesiiDouglas‐fir 28.1 Good Good 26 No Viable Remove New ROW Measured at narrowest point below union, codominant at 4'676Pseudotsuga menziesiiDouglas‐fir 16.6 Good Good 16 No Viable Remove New ROW 2 leaders at 30'677Pseudotsuga menziesiiDouglas‐fir 16.7 Good Good 15 No Viable Remove New ROW678Pseudotsuga menziesiiDouglas‐fir 9.7 Fair Fair 9 No Viable Remove New ROW Suppressed679Pseudotsuga menziesiiDouglas‐fir 19.9 Good Good 20 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 44 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes680Pseudotsuga menziesiiDouglas‐fir 18.1 Good Good 23 No Viable Remove Grading681Pseudotsuga menziesiiDouglas‐fir 32.8 23.5, 21.8, 6.9Good Good 28 Yes Viable Remove Grading 2 codominant stems, 1 subdominant stem682Pseudotsuga menziesiiDouglas‐fir 26.0 Good Good 26 No Viable Remove New ROW683Acer macrophyllumBigleaf maple 42.8 20.2, 12.6, 18.7, 30.2Good Good 31 Yes Viable Remove New ROW Some decay, stilted roots684Alnus rubraRed alder 12.2 Poor Poor 14 No Not ViableRemove Grading Dead tree leaning on trunk685Pseudotsuga menziesiiDouglas‐fir 15.0 Good Good 20 No Viable Remove Grading686Pseudotsuga menziesiiDouglas‐fir 13.0 12.6, 3 Good Good 16 No Viable Remove Grading Small subdominant stem687Pseudotsuga menziesiiDouglas‐fir 6.2 Fair Fair 15 No Viable Remove Grading Suppressed, not on survey688Pseudotsuga menziesiiDouglas‐fir 15.4 6.3, 14.1 Good Good 17 No Viable Remove Grading Narrowly attached subdominant stem689Pseudotsuga menziesiiDouglas‐fir 26.3 Good Good 25 No Viable Remove Grading Lost top690Pseudotsuga menziesiiDouglas‐fir 22.2 Good Good 23 No Viable Remove Grading691Pseudotsuga menziesiiDouglas‐fir 20.7 Fair Fair 27 No Viable Remove New ROW Lost top692Pseudotsuga menziesiiDouglas‐fir 27.7 Good Good 28 No Viable Remove New ROW693Pseudotsuga menziesiiDouglas‐fir 23.6 Good Good 28 No Viable Remove New ROW694Pseudotsuga menziesiiDouglas‐fir 17.0 Good Good 22 No Viable Remove New ROWTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 45 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes695Pseudotsuga menziesiiDouglas‐fir 21.3 Good Good 21 No Viable Remove New ROW696Pseudotsuga menziesiiDouglas‐fir 6.4 Poor Poor 10 No Not ViableRemove New ROW697Acer macrophyllumBigleaf maple 21.5 18.7, 10.6 Good Good 30 No Viable Remove Grading Wide attachment698Acer macrophyllumBigleaf maple 12.1 Good Good 25 No Viable Remove Grading699Acer macrophyllumBigleaf maple 10.7 Good Good 27 No Viable Remove Grading700Pseudotsuga menziesiiDouglas‐fir 11.4 Good Good 12 No Viable Remove Grading701Pseudotsuga menziesiiDouglas‐fir 12.3 Fair Fair 14 No Viable Remove New ROW Lost top, high live crown ratio, not on survey702Pseudotsuga menziesiiDouglas‐fir 20.0 Good Good 19 No Viable Remove New ROW703Pseudotsuga menziesiiDouglas‐fir 14.8 Good Good 17 No Viable Remove New ROW Kink in stem704Acer macrophyllumBigleaf maple 14.6 Good Good 21 No Viable Remove New ROW705Pseudotsuga menziesiiDouglas‐fir 9.0 Good Good 11 No Viable Remove New ROW706Pseudotsuga menziesiiDouglas‐fir 19.0 Good Good 13 No Viable Remove Grading707Alnus rubraRed alder 14.3 Poor Poor 11 No Not ViableRemove New ROW Dead codominant, lots of dieback, not on survey708Pseudotsuga menziesiiDouglas‐fir 16.7 Good Good 17 No Viable Remove New ROW Thin canopy; survey id 20727709Acer macrophyllumBigleaf maple 18.0 Good Good 28 No Viable Remove New ROW710Pseudotsuga menziesiiDouglas‐fir 13.5 Fair Fair 16 No Viable Remove Grading Thin canopy, high live crown ratioTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 46 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes711Acer macrophyllumBigleaf maple 11.6 Good Good 26 No Viable Remove Grading712Pseudotsuga menziesiiDouglas‐fir 18.0 Good Good 27 No Viable Remove Grading713Alnus rubraRed alder 8.9 Good Good 13 No Viable Remove Grading714Acer macrophyllumBigleaf maple 13.9 Good Good 30 No Viable Remove Grading715Alnus rubraRed alder 11.7 6.1, 10 Good Good 15 No Viable Remove Grading Codominant, narrow attachment716Pseudotsuga menziesiiDouglas‐fir 20.4 13.3, 15.5 Good Good 12 No Viable Remove Grading Codominant, narrow attachment717Pseudotsuga menziesiiDouglas‐fir 9.3 Good Good 13 No Viable Remove Grading Kink at bottom718Pseudotsuga menziesiiDouglas‐fir 11.5 Fair Fair 11 No Viable Remove Grading Kink at bottom719Pseudotsuga menziesiiDouglas‐fir 25.3 Good Good 25 No Viable Remove Grading720Pseudotsuga menziesiiDouglas‐fir 17.4 Good Good 22 No Viable Remove Grading721Pseudotsuga menziesiiDouglas‐fir 7.4 Fair Fair 12 No Viable Remove Grading Leaning, suppressed722Acer macrophyllumBigleaf maple 6.6 Good Good 18 No Viable Remove Grading Suppressed723Pseudotsuga menziesiiDouglas‐fir 18.8 Good Good 20 No Viable Remove Grading724Acer macrophyllumBigleaf maple 6.4 Good Good 24 No Viable Remove Grading725Populus trichocarpaBlack cottonwood 18.3 Good Good 23 No Viable Remove New ROW Adjacent to 726, phototropic, canopy to east726Pseudotsuga menziesiiDouglas‐fir 25.8 Good Good 26 No Viable Remove New ROW727Pseudotsuga menziesiiDouglas‐fir 15.6 Good Good 16 No Viable Remove New ROWTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 47 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes728Pseudotsuga menziesiiDouglas‐fir 12.4 Good Good 14 No Viable Remove New ROW729Pseudotsuga menziesiiDouglas‐fir 21.0 Good Good 22 No Viable Remove New ROW730Pseudotsuga menziesiiDouglas‐fir 20.4 Good Good 18 No Viable Remove New ROW731Pseudotsuga menziesiiDouglas‐fir 21.3 Good Good 20 No Viable Remove New ROW Phototropic corrected732Pseudotsuga menziesiiDouglas‐fir 22.3 Good Good 18 No Viable Remove Grading Directly adjacent to 731733Pseudotsuga menziesiiDouglas‐fir 13.5 Fair Fair 11 No Viable Remove Grading Thin canopy, high live crown ratio734Pseudotsuga menziesiiDouglas‐fir 25.6 17.3, 18.9 Good Good 20 No Viable Remove Grading Codominant, good attachment735Pseudotsuga menziesiiDouglas‐fir 22.4 Good Good 22 No Viable Remove Grading736Acer macrophyllumBigleaf maple 7.0 Good Good 24 No Viable Remove Grading737Pseudotsuga menziesiiDouglas‐fir 20.0 Good Good 21 No Viable Remove Grading738Pseudotsuga menziesiiDouglas‐fir 10.9 Poor Poor 8 No Not ViableRemove Grading Nearly dead, wound in trunk739Pseudotsuga menziesiiDouglas‐fir 7.7 Poor Poor 12 No Not ViableRemove Grading Suppressed, nearly dead740Pseudotsuga menziesiiDouglas‐fir 9.1 Poor Poor 15 No Not ViableRemove Grading Suppressed, nearly dead, lost top741Populus trichocarpaBlack cottonwood 18.5 Good Good 19 No Viable Remove Grading742Pseudotsuga menziesiiDouglas‐fir 9.7 Good Good 9 No Viable Remove New ROW743Acer macrophyllumBigleaf maple 8.0 Good Good 23 No Viable Remove New ROW survey id 20711Tree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 48 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes744Pseudotsuga menziesiiDouglas‐fir 16.6 Good Good 14 No Viable Remove New ROW Lost top745Pseudotsuga menziesiiDouglas‐fir 25.7 17.4, 18.9 Good Good 24 No Viable Remove New ROW Codominant, good attachment746Pseudotsuga menziesiiDouglas‐fir 21.9 Good Good 20 No Viable Remove New ROW Heavy ivy coverage747Pseudotsuga menziesiiDouglas‐fir 18.7 Good Good 19 No Viable Remove New ROW748Pseudotsuga menziesiiDouglas‐fir 20.4 Good Good 19 No Viable Remove New ROW749Pseudotsuga menziesiiDouglas‐fir 17.0 Good Good 15 No Viable Remove Grading750Alnus rubraRed alder 8.8 Good Good 14 No Viable Remove Grading Kink in stem751Alnus rubraRed alder 11.8 Good Good 16 No Viable Remove Grading752Pseudotsuga menziesiiDouglas‐fir 22.8 Good Good 21 No Viable Remove Grading753Pseudotsuga menziesiiDouglas‐fir 24.3 Good Good 22 No Viable Remove New ROW754Pseudotsuga menziesiiDouglas‐fir 14.0 Good Good 20 No Viable Remove New ROW755Alnus rubraRed alder 9.1 Fair Fair 17 No Viable Remove Grading 2 dead stems756Pseudotsuga menziesiiDouglas‐fir 13.0 Good Good 14 No Viable Remove Grading757Pseudotsuga menziesiiDouglas‐fir 19.6 Good Good 17 No Viable Remove Grading758Acer macrophyllumBigleaf maple 10.2 Fair Fair 17 No Viable Remove Grading Lost top759Pseudotsuga menziesiiDouglas‐fir 10.8 Good Good 14 No Viable Remove Grading Kinks in stem760Pseudotsuga menziesiiDouglas‐fir 7.3 Poor Poor 9 No Not ViableRemove Grading Nearly deadTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 49 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes761Pseudotsuga menziesiiDouglas‐fir 16.6 Good Good 16 No Viable Remove Grading762Pseudotsuga menziesiiDouglas‐fir 21.1 Good Good 22 No Viable Remove Grading763Pseudotsuga menziesiiDouglas‐fir 8.4 Good Good 9 No Viable Remove Grading764Populus trichocarpaBlack cottonwood 13.8 Good Good 17 No Viable Remove Grading Dead tree leaning on trunk765Populus trichocarpaBlack cottonwood 26.9 Good Good 22 No Viable Remove Grading Kink in stem766Pseudotsuga menziesiiDouglas‐fir 18.6 Good Good 20 No Viable Remove Grading767Pseudotsuga menziesiiDouglas‐fir 9.6 Fair Fair 14 No Viable Remove Grading Suppressed768Pseudotsuga menziesiiDouglas‐fir 8.9 Good Good 15 No Viable Remove Grading769Acer macrophyllumBigleaf maple 16.9 Good Good 29 No Viable Remove Grading770Alnus rubraRed alder 10.5 Fair Fair 25 No Viable Remove Grading Visible decay on stem771Acer macrophyllumBigleaf maple 6.3 Good Good 17 No Viable Remove Grading772Acer macrophyllumBigleaf maple 17.2 Good Good 33 No Viable Remove Grading773Alnus rubraRed alder 12.4 Good Good 25 No Viable Remove Grading Phototropic lean774Acer macrophyllumBigleaf maple 18.6 Good Good 27 No Viable Remove Grading775Pseudotsuga menziesiiDouglas‐fir 13.0 Good Good 14 No Viable Remove Grading776Pseudotsuga menziesiiDouglas‐fir 10.9 Fair Fair 9 No Viable Remove Grading Thin canopy777Acer macrophyllumBigleaf maple 8.0 Good Good 15 No Viable Remove Grading Dead tree adjacent778Acer macrophyllumBigleaf maple 15.2 Good Good 32 No Viable Remove Grading779Pseudotsuga menziesiiDouglas‐fir 15.4 Good Good 18 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 50 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes780Pseudotsuga menziesiiDouglas‐fir 15.0 Good Good 15 No Viable Remove New ROW781Alnus rubraRed alder 18.9 10.3, 9, 13.1Good Good 27 No Viable Remove New ROW782Alnus rubraRed alder 11.4 Good Good 17 No Viable Remove New ROW783Alnus rubraRed alder 8.6 Fair Fair 15 No Viable Remove New ROW Wounds on stem, visible decay, not on survey784Alnus rubraRed alder 12.0 Poor Poor 10 No Not ViableRemove Grading Nearly dead785Alnus rubraRed alder 9.3 Fair Fair 18 No Viable Remove New ROW Phototropic, partial failure786Alnus rubraRed alder 9.7 Fair Fair 15 No Viable Remove New ROW Lost top787Alnus rubraRed alder 8.8 Good Good 9 No Viable Remove Grading788Acer macrophyllumBigleaf maple 16.5 Good Good 24 No Viable Remove Grading789Alnus rubraRed alder 13.8 Good Good 16 No Viable Remove Grading790Pseudotsuga menziesiiDouglas‐fir 14.9 Good Good 18 No Viable Remove Grading791Acer macrophyllumBigleaf maple 12.6 Good Good 26 No Viable Remove Grading792Alnus rubraRed alder 15.1 Fair Fair 22 10 No Viable Retain Low live crown ratio, concern over exposure from adj removals793Acer macrophyllumBigleaf maple 10.4 Good Good 22 No Viable Remove Grading794Acer macrophyllumBigleaf maple 16.3 Good Good 28 No Viable Remove Grading795Alnus rubraRed alder 13.7 Good Good 35 No Viable Remove Grading796Alnus rubraRed alder 10.4 Good Good 17 No Viable Remove Grading797Alnus rubraRed alder 14.5 Fair Fair 16 No Viable Remove Grading Dieback in canopyTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 51 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes798Alnus rubraRed alder 15.9 10, 12.4 Good Good 24 No Viable Remove New ROW Phototropic lean799Pseudotsuga menziesiiDouglas‐fir 17.5 Good Good 22 No Viable Remove New ROW800Pseudotsuga menziesiiDouglas‐fir 20.2 Good Good 25 No Viable Remove New ROW801Pseudotsuga menziesiiDouglas‐fir 16.8 Good Good 18 No Viable Remove New ROW802Pseudotsuga menziesiiDouglas‐fir 9.2 Good Good 10 No Viable Remove New ROW Suppressed803Pseudotsuga menziesiiDouglas‐fir 11.6 Good Good 12 No Viable Remove New ROW804Pseudotsuga menziesiiDouglas‐fir 8.9 Good Good 11 No Viable Remove New ROW805Pseudotsuga menziesiiDouglas‐fir 10.7 Good Good 12 No Viable Remove New ROW806Pseudotsuga menziesiiDouglas‐fir 14.6 Good Good 23 No Viable Remove New ROW Curve in stem807Pseudotsuga menziesiiDouglas‐fir 17.6 Good Good 25 No Viable Remove New ROW Swept base808Pseudotsuga menziesiiDouglas‐fir 8.8 Fair Fair 11 No Viable Remove New ROW Suppressed, lost top809Pseudotsuga menziesiiDouglas‐fir 7.3 Fair Fair 10 No Viable Remove New ROW Suppressed810Pseudotsuga menziesiiDouglas‐fir 16.2 Good Good 26 No Viable Remove New ROW811Pseudotsuga menziesiiDouglas‐fir 14.9 Good Good 20 No Viable Remove New ROW812Pseudotsuga menziesiiDouglas‐fir 11.1 Good Good 11 No Viable Remove New ROWTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 52 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes813Pseudotsuga menziesiiDouglas‐fir 7.6 Fair Fair 8 No Viable Remove New ROW814Pseudotsuga menziesiiDouglas‐fir 14.7 Good Good 16 No Viable Remove New ROW815Pseudotsuga menziesiiDouglas‐fir 18.7 Good Good 17 No Viable Remove New ROW816Pseudotsuga menziesiiDouglas‐fir 13.2 Good Good 14 No Viable Remove New ROW Lost top, slightly suppressed817Acer macrophyllumBigleaf maple 12.8 Good Good 27 9 No Viable Remove Grading Remove due to utility easement overlap. Low live crown ratio, concern over exposure from adj removals818Pseudotsuga menziesiiDouglas‐fir 11.8 Fair Fair 11 8 No Viable Remove Grading Remove due to utility easement overlap. Low live crown ratio, concern over exposure from adj removals819Pseudotsuga menziesiiDouglas‐fir 7.4 Fair Fair 11 5 No Viable Retain Ivy on stem, Low live crown ratio, concern over exposure from adj removals820Pseudotsuga menziesiiDouglas‐fir 27.1 Good Good 29 18 No Viable Remove Grading Ivy on stem, lost top, Low live crown ratio, concern over exposure from adj removalsTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 53 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes821Acer macrophyllumBigleaf maple 8.2 Good Good 16 5 No Viable Retain Low live crown ratio, concern over exposure from adj removals822Pseudotsuga menziesiiDouglas‐fir 25.6 Good Good 25 17 No Viable Retain Labeled 21125 on survey, not tagged823Pseudotsuga menziesiiDouglas‐fir 25.2 18.2, 17.5 Good Good 27 No Viable Remove Grading Codominant, wide attachment824Pseudotsuga menziesiiDouglas‐fir 8.1 Good Good No Viable Remove Grading825Pseudotsuga menziesiiDouglas‐fir 12.2 Poor Poor 18 No Not ViableRemove Grading Leaning on 825826Pseudotsuga menziesiiDouglas‐fir 13.6 Good Good 17 No Viable Remove Grading Lost top827Pseudotsuga menziesiiDouglas‐fir 18.1 Good Good 16 No Viable Remove Grading Dead subdominant828Pseudotsuga menziesiiDouglas‐fir 18.1 Good Good 23 No Viable Remove Grading829Pseudotsuga menziesiiDouglas‐fir 17.2 Good Good 21 No Viable Remove Grading830Pseudotsuga menziesiiDouglas‐fir 6.2 Fair Fair 6 No Viable Remove Grading Suppressed831Pseudotsuga menziesiiDouglas‐fir 20.4 Good Good 23 No Viable Remove Grading832Pseudotsuga menziesiiDouglas‐fir 14.3 Good Good 17 No Viable Remove Grading Dead subdominant833Pseudotsuga menziesiiDouglas‐fir 14.0 Good Good 19 No Viable Remove Grading Kink in stem834Pseudotsuga menziesiiDouglas‐fir 8.3 Fair Fair 9 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 54 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes835Pseudotsuga menziesiiDouglas‐fir 10.5 Good Good 17 No Viable Remove New ROW Large tearout836Pseudotsuga menziesiiDouglas‐fir 6.7 Fair Fair 8 No Viable Remove New ROW Lost top837Pseudotsuga menziesiiDouglas‐fir 22.3 11.7, 19 Good Good 27 No Viable Remove New ROW Codominant838Pseudotsuga menziesiiDouglas‐fir 11.7 Good Good 17 No Viable Remove New ROW839Pseudotsuga menziesiiDouglas‐fir 10.8 Good Good 14 No Viable Remove New ROW Dead subdominant stem840Pseudotsuga menziesiiDouglas‐fir 16.5 Good Good 18 No Viable Remove New ROW841Pseudotsuga menziesiiDouglas‐fir 8.7 Good Good 14 No Viable Remove New ROW842Pseudotsuga menziesiiDouglas‐fir 19.3 Good Good 18 No Viable Remove New ROW843Pseudotsuga menziesiiDouglas‐fir 14.8 Good Good 10 No Viable Remove New ROW Lost top844Pseudotsuga menziesiiDouglas‐fir 8.2 Good Good 11 No Viable Remove New ROW845Pseudotsuga menziesiiDouglas‐fir 11.2 Good Good 10 No Viable Remove New ROW846Pseudotsuga menziesiiDouglas‐fir 6.5 Fair Fair 3 No Viable Remove New ROW Suppressed847Pseudotsuga menziesiiDouglas‐fir 18.6 13.3, 13 Good Good 16 No Viable Remove Grading Wide attachment848Pseudotsuga menziesiiDouglas‐fir 6.6 Fair Fair 6 No Viable Remove Grading Dead codominant stem, wounds with decay849Pseudotsuga menziesiiDouglas‐fir 19.8 Good Good 17 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 55 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes850Pseudotsuga menziesiiDouglas‐fir 22.0 Good Good 19 No Viable Remove Grading851Pseudotsuga menziesiiDouglas‐fir 13.0 Good Good 20 No Viable Remove Grading Not on survey852Pseudotsuga menziesiiDouglas‐fir 7.3 Poor Poor 4 No Not ViableRemove Grading Nearly dead853Pseudotsuga menziesiiDouglas‐fir 16.4 Good Good 16 No Viable Remove Grading854Pseudotsuga menziesiiDouglas‐fir 25.3 17.8, 18 Good Good 18 No Viable Remove Grading Codominant, narrow attachment855Pseudotsuga menziesiiDouglas‐fir 16.3 Good Good 16 No Viable Remove Grading856Pseudotsuga menziesiiDouglas‐fir 12.3 Good Good 15 No Viable Remove Grading857Pseudotsuga menziesiiDouglas‐fir 7.2 Good Good 13 No Viable Remove Grading858Pseudotsuga menziesiiDouglas‐fir 30.6 Good Good 26 Yes Viable Remove Grading859Acer macrophyllumBigleaf maple 7.6 Good Good 11 No Viable Remove Grading860Prunus emarginataBitter cherry 8.4 Good Good 16 No Viable Remove Grading861Pseudotsuga menziesiiDouglas‐fir 17.8 Good Good 18 No Viable Remove Grading Not on survey 862Acer macrophyllumBigleaf maple 6.7 Good Good 10 No Viable Remove Grading863Pseudotsuga menziesiiDouglas‐fir 10.8 Good Good 15 No Viable Remove Grading864Pseudotsuga menziesiiDouglas‐fir 16.9 Good Good 17 No Viable Remove Grading865Pseudotsuga menziesiiDouglas‐fir 16.0 Good Good 18 No Viable Remove Grading866Pseudotsuga menziesiiDouglas‐fir 13.4 Good Good 15 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 56 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes867Pseudotsuga menziesiiDouglas‐fir 20.0 Good Good 19 No Viable Remove Grading Not on survey868Pseudotsuga menziesiiDouglas‐fir 21.2 Good Good 23 No Viable Remove Grading869Pseudotsuga menziesiiDouglas‐fir 14.6 Good Good 13 No Viable Remove Grading870Pseudotsuga menziesiiDouglas‐fir 15.4 Good Good 14 No Viable Remove Grading871Pseudotsuga menziesiiDouglas‐fir 8.4 Good Good 8 No Viable Remove Grading872Pseudotsuga menziesiiDouglas‐fir 18.0 Good Good 14 No Viable Remove Grading Young ivy on trunk873Pseudotsuga menziesiiDouglas‐fir 20.6 Good Good 18 No Viable Remove Grading874Pseudotsuga menziesiiDouglas‐fir 8.6 Fair Fair 3 No Viable Remove Grading875Pseudotsuga menziesiiDouglas‐fir 18.9 Good Good 16 No Viable Remove Grading876Pseudotsuga menziesiiDouglas‐fir 18.7 Good Good 20 No Viable Remove Grading Kink in stem877Pseudotsuga menziesiiDouglas‐fir 13.2 Fair Fair 19 No Viable Remove Grading Lost top878Pseudotsuga menziesiiDouglas‐fir 24.6 Good Good 27 No Viable Remove Grading879Prunus emarginataBitter cherry 7.7 Good Good 11 No Viable Remove Grading880Populus trichocarpaBlack cottonwood 43.3 Good Good 35 Yes Viable Remove Grading Swept base881Alnus rubraRed alder 8.0 Good Good 7 No Viable Remove Grading882Alnus rubraRed alder 15.7 Good Good 20 No Viable Remove Grading883Pseudotsuga menziesiiDouglas‐fir 11.6 Good Good 17 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 57 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes884Pseudotsuga menziesiiDouglas‐fir 16.5 Good Good 18 No Viable Remove Grading885Alnus rubraRed alder 9.2 Good Good 13 No Viable Remove Grading Not on survey886Rhamnus purshianaCascara 6.5 Good Good 10 No Viable Remove Grading Some dieback887Pseudotsuga menziesiiDouglas‐fir 22.6 Good Good 20 No Viable Remove Grading888Pseudotsuga menziesiiDouglas‐fir 21.4 Good Good 20 No Viable Remove Grading889Pseudotsuga menziesiiDouglas‐fir 16.8 Good Good 17 No Viable Remove Grading890Pseudotsuga menziesiiDouglas‐fir 23.9 Good Good 26 No Viable Remove Grading891Pseudotsuga menziesiiDouglas‐fir 19.0 Good Good 30 No Viable Remove Grading892Pseudotsuga menziesiiDouglas‐fir 16.0 Good Good 18 No Viable Remove Grading893Pseudotsuga menziesiiDouglas‐fir 17.9 Good Good 18 No Viable Remove Grading894Acer macrophyllumBigleaf maple 15.1 Good Good 25 No Viable Remove Grading895Pseudotsuga menziesiiDouglas‐fir 22.8 Good Good 16 No Viable Remove Grading896Pseudotsuga menziesiiDouglas‐fir 21.6 Good Good 22 No Viable Remove Grading Directly adjacent to 897897Pseudotsuga menziesiiDouglas‐fir 18.9 Good Good 20 No Viable Remove Grading898Pseudotsuga menziesiiDouglas‐fir 24.4 Good Good 21 No Viable Remove Grading899Pseudotsuga menziesiiDouglas‐fir 16.7 Good Good 15 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 58 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes900Pseudotsuga menziesiiDouglas‐fir 21.9 Good Good 22 No Viable Remove Grading Possibly shared901Pseudotsuga menziesiiDouglas‐fir 15.3 Good Good 16 No Viable Remove Grading902Pseudotsuga menziesiiDouglas‐fir 12.1 Good Good 14 No Viable Remove Grading903Populus trichocarpaBlack cottonwood 21.9 Good Good 20 No Viable Remove Grading904Pseudotsuga menziesiiDouglas‐fir 21.1 Good Good 25 No Viable Remove Grading905Pseudotsuga menziesiiDouglas‐fir 18.4 11.2, 14.6 Good Good 17 No Viable Remove Grading906Pseudotsuga menziesiiDouglas‐fir 18.6 Good Good 23 No Viable Remove Grading907Pseudotsuga menziesiiDouglas‐fir 15.3 Good Good 19 No Viable Remove Grading908Pseudotsuga menziesiiDouglas‐fir 15.7 Good Good 16 No Viable Remove Grading909Pseudotsuga menziesiiDouglas‐fir 20.8 Good Good 20 No Viable Remove Grading910Pseudotsuga menziesiiDouglas‐fir 18.2 Good Good 19 No Viable Remove Grading911Pseudotsuga menziesiiDouglas‐fir 21.0 Good Good 18 No Viable Remove Grading912Pseudotsuga menziesiiDouglas‐fir 11.2 Good Good 12 No Viable Remove Grading High live crown ratio913Alnus rubraRed alder 17.0 Fair Fair 13 No Viable Remove Grading 2 dead stems914Pseudotsuga menziesiiDouglas‐fir 20.3 Good Good 23 No Viable Remove Grading915Pseudotsuga menziesiiDouglas‐fir 21.6 Good Good 24 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 59 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes916Pseudotsuga menziesiiDouglas‐fir 21.6 Good Good 22 No Viable Remove Grading Wound on side917Pseudotsuga menziesiiDouglas‐fir 21.0 Good Good 20 No Viable Remove Grading918Pseudotsuga menziesiiDouglas‐fir 22.1 Good Good 18 No Viable Remove Grading919Pseudotsuga menziesiiDouglas‐fir 17.3 Good Good 14 No Viable Remove Grading Subdominant leader at 50'920Pseudotsuga menziesiiDouglas‐fir 16.7 Good Good 15 No Viable Remove Grading921Pseudotsuga menziesiiDouglas‐fir 19.9 Good Good 18 No Viable Remove Grading922Pseudotsuga menziesiiDouglas‐fir 28.4 Good Good 26 No Viable Remove Grading923Pseudotsuga menziesiiDouglas‐fir 7.7 Fair Fair 8 5 No Viable Retain924Pseudotsuga menziesiiDouglas‐fir 20.1 Good Good 21 8 No Viable Retain Confirm no fill within LOD.925Pseudotsuga menziesiiDouglas‐fir 28.2 Good Good 30 12 No Viable Retain Young ivy on trunk. Grading proposed within 5 feet of trunk. Must stay at least 12 feetaway.926Pseudotsuga menziesiiDouglas‐fir 25.1 Good Good 20 No Viable Remove Grading927Pseudotsuga menziesiiDouglas‐fir 10.2 Good Good 10 No Viable Remove Grading Lost top928Pseudotsuga menziesiiDouglas‐fir 14.0 Good Good 17 No Viable Remove Grading Bulge at base, dead codominant stem929Pseudotsuga menziesiiDouglas‐fir 20.2 Good Good 15 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 60 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes930Pseudotsuga menziesiiDouglas‐fir 8.8 Good Good 8 No Viable Remove Grading931Pseudotsuga menziesiiDouglas‐fir 15.2 Good Good 12 No Viable Remove Grading932Pseudotsuga menziesiiDouglas‐fir 22.1 Good Good 25 No Viable Remove Grading Crack on west side933Acer macrophyllumBigleaf maple 24.1 13.3, 18.3, 8.3Good Good 31 No Viable Remove Grading Recovered from early failure, included bark934Acer macrophyllumBigleaf maple 7.6 Fair Fair 15 No Viable Remove Grading935Acer macrophyllumBigleaf maple 18.8 Good Good 33 No Viable Remove Grading936Pseudotsuga menziesiiDouglas‐fir 24.2 Good Good 23 No Viable Remove Grading Lost top937Acer macrophyllumBigleaf maple 14.1 Good Good 34 No Viable Remove Grading938Acer macrophyllumBigleaf maple 8.1 Fair Fair 30 No Viable Remove Grading Lost top, not on survey ‐ confirm location, retention may be feasible939Alnus rubraRed alder 8.8 Good Good 12 6 No Viable Retain940Pseudotsuga menziesiiDouglas‐fir 19.2 Good Good 18 13 No Viable Retain941Pseudotsuga menziesiiDouglas‐fir 13.8 Good Good 18 9 No Viable Retain Lost top942Pseudotsuga menziesiiDouglas‐fir 9.5 Good Good 14 6 No Viable Retain943Pseudotsuga menziesiiDouglas‐fir 24.3 Good Good 23 No Viable Remove Grading944Acer macrophyllumBigleaf maple 8.0 Good Good 21 5 No Viable Retain945Acer macrophyllumBigleaf maple 9.1 Good Good 21 6 No Viable Retain946Populus trichocarpaBlack cottonwood 10.6 Good Good 16 7 No Viable Retain Maintain LOD due to species.Tree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 61 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes947Acer macrophyllumBigleaf maple 10.1 Good Good 15 No Viable Remove Grading Ivy on trunk, dead tree leaning on stem948Acer macrophyllumBigleaf maple 38.9 27.5, 27.5 Good Good 45 Yes Viable Remove Grading Old tearout, wounds, kretzschmaria, decay949Alnus rubraRed alder 11.3 Fair Fair 10 No Viable Remove Grading Dead codominant stem; survey id 20660950Acer macrophyllumBigleaf maple 7.9 Good Good 18 No Viable Remove Grading Not on survey951Acer macrophyllumBigleaf maple 12.1 Good Good 23 No Viable Remove Grading952Acer macrophyllumBigleaf maple 13.5 Good Good 15 No Viable Remove Grading953Acer macrophyllumBigleaf maple 13.5 Good Good 21 No Viable Remove Grading954Acer macrophyllumBigleaf maple 8.0 Good Good 17 No Viable Remove Grading955Acer macrophyllumBigleaf maple 35.7 Fair Fair 33 Yes Viable Remove Grading Measured at narrowest point below union, decay at base956Acer macrophyllumBigleaf maple 29.4 Good Good 40 No Viable Remove Grading957Alnus rubraRed alder 17.0 Poor Poor 15 No Not ViableRemove Grading Ivy in canopy, 2 dead stems958Alnus rubraRed alder 16.9 12.5, 11.3 Poor Poor 17 No Not ViableRemove Grading 1 dead stem959Pseudotsuga menziesiiDouglas‐fir 14.7 Good Good 17 No Viable Remove Grading960Populus trichocarpaBlack cottonwood 33.9 Fair Fair 40 Yes Viable Remove Grading Large wound in trunk961Pseudotsuga menziesiiDouglas‐fir 17.7 Good Good 18 No Viable Remove Grading962Populus trichocarpaBlack cottonwood 32.5 Good Good 24 Yes Viable Remove Grading963Acer macrophyllumBigleaf maple 37.0 Good Good 34 Yes Viable Remove Grading 5 stems, measured at narrowest point below unionTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 62 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes964Prunus emarginataBitter cherry 6.5 Fair Fair 15 No Viable Remove New ROW965Prunus emarginataBitter cherry 11.6 Good Good 15 No Viable Remove New ROW966Acer macrophyllumBigleaf maple 6.5 Good Good 17 No Viable Remove Grading Swept base, lost top, not on survey967Alnus rubraRed alder 13.3 Poor Poor 12 No Not ViableRemove Grading Lots of dieback968Alnus rubraRed alder 6.0 Fair Fair 10 No Viable Remove Grading969Prunus emarginataBitter cherry 7.3 Poor Poor 8 No Not ViableRemove Grading970Acer macrophyllumBigleaf maple 6.6 Good Good 13 No Viable Remove Grading Dead codominant stem, decay at base971Pseudotsuga menziesiiDouglas‐fir 8.5 Good Good 9 No Viable Remove Grading972Crataegus monogynaCommon hawthorne 7.4 Good Good 14 No Viable Remove Grading survey id 20595973Acer macrophyllumBigleaf maple 17.0 Good Good 32 No Viable Remove Grading974Alnus rubraRed alder 22.0 16.1, 15 Fair Fair 20 No Viable Remove Grading Visible decay, lots of dieback975Prunus emarginataBitter cherry 12.8 Fair Fair 16 No Viable Remove Grading Dead codominant stem 976Frangula purshianaCascara 12.6 Fair Fair 15 No Viable Remove New ROW Failed leader977Alnus rubraRed alder 10.6 Poor Poor 11 No Not ViableRemove Grading Not on survey978Alnus rubraRed alder 19.5 11, 11, 11 Fair Fair 27 No Viable Remove Grading979Pseudotsuga menziesiiDouglas‐fir 8.3 Fair Fair 13 No Viable Remove Grading980Acer macrophyllumBigleaf maple 7.2 Good Good 20 No Viable Remove Grading981Acer macrophyllumBigleaf maple 7.5 Good Good 21 No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 63 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes982Pseudotsuga menziesiiDouglas‐fir 27.3 Good Good 33 No Viable Remove Grading Subdominant stem983Pseudotsuga menziesiiDouglas‐fir 21.5 Good Good 28 No Viable Remove Grading984Acer macrophyllumBigleaf maple 15.3 Good Good 16 No Viable Remove Grading985Alnus rubraRed alder 25.0 17, 17, 7 Fair Fair 10 No Viable Remove Grading 2 dead stems986Alnus rubraRed alder 21.2 15, 15 Fair Fair 19 No Viable Remove New ROW Visible decay987Alnus rubraRed alder 15.0 Good Good 27 No Viable Remove Grading988Alnus rubraRed alder 9.5 Good Good 13 No Viable Remove New ROW989Alnus rubraRed alder 10.3 7.6, 7 Fair Fair 14 No Viable Remove New ROW Visible decay990Alnus rubraRed alder 13.5 Fair Fair 15 No Viable Remove New ROW991Alnus rubraRed alder 23.8 17.2, 16.5 Fair Fair 23 No Viable Remove New ROW992Alnus rubraRed alder 13.2 Good Good 22 No Viable Remove Grading993Acer macrophyllumBigleaf maple 8.0 Good Good 16 No Viable Remove Grading994Alnus rubraRed alder 35.5 14, 15, 16, 16, 18Good Good 30 Yes Viable Remove Grading Visible decay995Alnus rubraRed alder 38.9 24, 16, 18, 19Good Good 32 Yes Viable Remove Grading996Frangula purshianaCascara 7.8 Good Good 18 No Viable Remove Grading Not on survey ‐ confirm location to determine if in ROW997Acer macrophyllumBigleaf maple 36.5 25, 11, 11, 8, 20Good Good 36 Yes Viable Remove New ROW Large failure; utility easementTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 64 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes998Acer macrophyllumBigleaf maple 45.0 Good Good 40 Yes Viable Remove Grading Narrowly attached, measured at narrowest point below union999Alnus rubraRed alder 12.8 Fair Fair 17 9 No Viable Retain Main leader is broken, one or two live branches1000Acer macrophyllumBigleaf maple 7.2 Good Good 18 5 No Viable Remove 1/21/2019 ‐ location appears incorrect on survey, not tagged, number written on trunk in blue. See map for approximate location1001Acer macrophyllumBigleaf maple 6.8 Good Good 14 5 No Viable Remove 1/21/2019 ‐ location appears incorrect on survey, not tagged, number written on trunk in blue. See map for approximate location1002Prunus emarginataBitter cherry 8.8 6.9, 5.5 Good Good 11 No Viable Remove Grading Not on survey ‐ may be in tree preservation area. 1/21/2019 ‐ location appears incorrect on survey, not tagged, number written on trunk in blue. See map for approximate location.Tree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 65 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes1003Prunus emarginataBitter cherry 9.5 Good Good 15 No Viable Remove Grading Not on survey ‐ may be in tree preservation area. 1/21/2019 ‐ location appears incorrect on survey, not tagged, number written on trunk in blue1004Prunus emarginataBitter cherry 7.1 Fair Fair 10 No Viable Remove Grading Lost top, not on survey ‐ may be in tree preservation area. 1/21/2019 ‐ location appears incorrect on survey, not tagged, number written on trunk in blue1005Crataegus monogynaCommon hawthorne 8.2 Good Good 8 No Viable Remove Grading Measured at narrowest point below union, not on survey ‐ may be in tree preservation area. 1/21/2019 ‐ location is incorrect on survey, not tagged, number written on trunk in blue. See map for approximate location.Tree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 66 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes10289Pseudotsuga menziesiiDouglas‐fir 28.0 Good Good 20 14 No Viable Retain Inventoried 1/19/2019 by TSI. DSH estimated. Maintain LOD. 10506Pseudotsuga menziesiiDouglas‐fir 28.0 Good Good 19 14 No Viable Retain Inventoried 1/19/2019 by TSI. DSH estimated. 10509Alnus rubraRed alder n/a DEAD DEAD n/a Not ViableRemove Grading Uprooted and on ground. Mislabeled on survey as 2050910510Pseudotsuga menziesiiDouglas‐fir 24.0 Good Fair 20 Viable Retain Previously broken top with two main leaders, corrected lean to the north. Inventoried 1/19/2019 by TSI. DSH estimated. 10519Pseudotsuga menziesiiDouglas‐fir 6.0 n/a n/a 4 No Viable Retain Not tagged, identified by surveyor, was likely less than 6 inches diameter at time of tree inventory10522Pseudotsuga menziesiiDouglas‐fir 6.0 n/a n/a 4 No Viable Retain Not tagged, identified by surveyor, was likely less than 6 inches diameter at time of tree inventory10561Pseudotsuga menziesiiDouglas‐fir 24.0 n/a n/a 12 No Viable Retain Not inventoried by TSI. Data is from survey. Maintain LOD.Tree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 67 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes10626Pseudotsuga menziesiiDouglas‐fir 14.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor10745Alnus rubraRed alder 12.0 Dead Poor No Not ViableRemove Grading Not tagged, identified by surveyor, Condition Change as of 11/28/201820080Populus trichocarpaBlack cottonwood 12.5 6, 8, 5, 4, 4 n/a n/a 8 No Viable Remove Grading Not tagged, identified by surveyor20186Populus trichocarpaBlack cottonwood 8.0 n/a n/a 5 No Viable Retain Not assessed by TSI, data from survey.20207Acer macrophyllumBigleaf maple 17.0 12, 12 n/a n/a No Viable Retain Likely tree 567, not tagged, identified by surveyor20230Acer macrophyllumBigleaf maple 8.0 n/a n/a 5 No Viable Retain Not assessed by TSI, data from survey.20234Acer macrophyllumBigleaf maple 14.0 n/a n/a No Viable Remove Grading20235Acer macrophyllumBigleaf maple 24.1 18, 16 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20265Alnus rubraRed alder 10.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20337Acer macrophyllumBigleaf maple 6.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20378Alnus rubraRed alder 12.0 n/a n/a 8 No Viable Retain20379Alnus rubraRed alder 14.0 n/a n/a 9 No Viable Retain20380Alnus rubraRed alder 14.0 n/a n/a 9 No Viable Retain20381Alnus rubraRed alder 10.0 n/a n/a 7 No Viable RetainTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 68 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes20383Acer macrophyllumBigleaf maple 8.0 n/a n/a 5 No Viable Retain20384Acer macrophyllumBigleaf maple 10.0 n/a n/a 7 No Viable Retain20385Acer macrophyllumBigleaf maple 12.0 n/a n/a 8 No Viable Retain20386Alnus rubraRed alder 12.0 n/a n/a 8 No Viable Retain20387Alnus rubraRed alder 10.0 n/a n/a 7 No Viable Retain20388Alnus rubraRed alder 16.0 n/a n/a 11 No Viable Retain20389 Acer macrophyllum Bigleaf maple 12.0 n/a n/a 8 No Viable Retain20390Alnus rubraRed alder 12.0 n/a n/a 8 No Viable Retain20391 Populus trichocarpa Black cottonwood 26.0 n/a n/a 17 No Viable Remove Grading No apparent grading nearby. On property line of Perkins Parcel andLot24.20392Alnus rubraRed alder 16.0 n/a n/a 11 No Viable Remove Grading Maintain LOD due to species.20393Alnus rubraRed alder 10.0 n/a n/a 7 No Viable Retain20394Acer macrophyllumBigleaf maple 24.0 n/a n/a Viable Remove Grading20395Alnus rubraRed alder 10.0 n/a n/a 7 No Viable Retain20396Acer macrophyllumBigleaf maple 16.0 n/a n/a Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 69 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes20397Acer macrophyllumBigleaf maple 11.3 8,8 n/a n/a Viable Remove Grading20398Alnus rubraRed alder 8.0 n/a n/a 5 No Viable Retain20399Acer macrophyllumBigleaf maple 16.0 n/a n/a Viable Remove Grading20400Acer macrophyllumBigleaf maple 14.0 n/a n/a No Viable Remove New ROW20401Acer macrophyllumBigleaf maple 6.0 n/a n/a 4 No Viable Retain20402Acer macrophyllumBigleaf maple 18.4 12,14 n/a n/a No Viable Remove New ROW20403Acer macrophyllumBigleaf maple 16.0 n/a n/a No Viable Remove New ROW20404Acer macrophyllumBigleaf maple 12.0 n/a n/a 8 No Viable Retain20405Alnus rubraRed alder 10.0 n/a n/a No Viable Remove New ROW20406Acer macrophyllumBigleaf maple 12.8 8,10 n/a n/a 9 No Viable Retain20407Acer macrophyllumBigleaf maple 8.0 n/a n/a No Viable Remove New ROW20408Populus trichocarpaBlack cottonwood 8.0 n/a n/a 5 No Viable Retain Not assessed by TSI. Data from survey.20409Acer macrophyllumBigleaf maple 8.0 n/a n/a No Viable Remove New ROW20410Acer macrophyllumBigleaf maple 6.0 n/a n/a No Viable Remove New ROW20411Acer macrophyllumBigleaf maple 12.0 n/a n/a 8 No Viable RetainTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 70 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes20412Acer macrophyllumBigleaf maple 8.0 n/a n/a No Viable Remove New ROW20413Acer macrophyllumBigleaf maple 8.0 n/a n/a No Viable Remove New ROW20415Acer macrophyllumBigleaf maple 10.0 n/a n/a No Viable Remove New ROW20416Acer macrophyllumBigleaf maple 14.0 n/a n/a No Viable Remove New ROW20418Acer macrophyllumBigleaf maple 6.0 n/a n/a No Viable Remove New ROW20421Acer macrophyllumBigleaf maple 6.0 n/a n/a No Viable Remove New ROW20424Acer macrophyllumBigleaf maple 8.0 n/a n/a No Viable Remove New ROW20428Acer macrophyllumBigleaf maple 8.0 n/a n/a No Viable Remove New ROW20432Acer macrophyllumBigleaf maple 12.0 n/a n/a No Viable Remove New ROW20434Acer macrophyllumBigleaf maple 10.0 n/a n/a No Viable Remove New ROW20436Acer macrophyllumBigleaf maple 10.0 n/a n/a No Viable Remove New ROW20438Acer macrophyllumBigleaf maple 14.0 n/a n/a No Viable Remove New ROW20439Acer macrophyllumBigleaf maple 10.0 n/a n/a No Viable Remove New ROW20440Acer macrophyllumBigleaf maple 10.0 n/a n/a No Viable Remove New ROW20449Acer macrophyllumBigleaf maple 6.0 n/a n/a No Viable Remove New ROW Not tagged, identified by surveyor20452Acer macrophyllumBigleaf maple 12.0 n/a n/a No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 71 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes20453Acer macrophyllumBigleaf maple 14.0 n/a n/a No Viable Remove Grading20455Acer macrophyllumBigleaf maple 12.0 n/a n/a No Viable Remove Grading20458Acer macrophyllumBigleaf maple 10.0 n/a n/a No Viable Remove Grading20461Acer macrophyllumBigleaf maple 16.0 n/a n/a No Viable Remove Grading20462Acer macrophyllumBigleaf maple 8.0 n/a n/a No Viable Remove New ROW20463Acer macrophyllumBigleaf maple 12.0 n/a n/a No Viable Remove New ROW20465Populus trichocarpaBlack cottonwood 32.0 n/a n/a Yes Viable Remove Grading20482Acer macrophyllumBigleaf maple 6.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20490Acer macrophyllumBigleaf maple 6.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20492Acer macrophyllumBigleaf maple 6.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20506Pseudotsuga menziesiiDouglas‐fir 6.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20544Pseudotsuga menziesiiDouglas‐fir 24.0 n/a n/a No Viable Remove Grading20545Pseudotsuga menziesiiDouglas‐fir 24.0 n/a n/a No Viable Remove Grading20546Pseudotsuga menziesiiDouglas‐fir 26.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20547Acer macrophyllumBigleaf maple 10.0 n/a n/a No Viable Remove Grading20548Pseudotsuga menziesiiDouglas‐fir 28.0 n/a n/a No Viable Remove Grading20549Pseudotsuga menziesiiDouglas‐fir 30.0 n/a n/a No Viable Remove Grading20550Pseudotsuga menziesiiDouglas‐fir 26.0 n/a n/a No Viable Remove GradingTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 72 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes20551Pseudotsuga menziesiiDouglas‐fir 32.0 n/a n/a Yes Viable Remove Grading20552Pseudotsuga menziesiiDouglas‐fir 26.0 n/a n/a No Viable Remove Grading20560Alnus rubraRed alder 23.8 12, 12, 12, 8, 6, 6n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20561Alnus rubraRed alder 21.1 10, 10, 10, 12n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20563Alnus rubraRed alder 13.4 12, 6 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20601Alnus rubraRed alder 12.0 n/a n/a No Viable Remove New ROW Not tagged, identified by surveyor20659Alnus rubraRed alder 9.0 Good Good 26 No Viable Retain20661Thuja plicataWestern redcedar 10 Good Good 14 No Viable Retain20722Pseudotsuga menziesiiDouglas‐fir 14.0 n/a n/a No Viable Remove New ROW Not tagged, identified by surveyor20889Acer macrophyllumBigleaf maple 6.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20902Pseudotsuga menziesiiDouglas‐fir 18.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20944Pseudotsuga menziesiiDouglas‐fir 18.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20992Alnus rubraRed alder 18.4 14, 12 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor20994Pseudotsuga menziesiiDouglas‐fir 6.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor21071Pseudotsuga menziesiiDouglas‐fir 16.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyorTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 73 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason Notes21203Acer macrophyllumBigleaf maple 6.0 n/a n/a #REF! No Viable Retain Not tagged, identified by surveyor, likely less than 6 inches at time of treeinventory21486Malus domesticaCommon apple 19.0 8, 10, 14 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor21534Thuja plicataWestern redcedar 32.0 n/a n/a 18 13 Yes Viable Retain Inventoried 1/19/2019 by TSI. DSH estimated. Maintain LOD.21789Acer macrophyllumBigleaf maple 10.0 n/a n/a No Viable Remove New ROW Not tagged, identified by surveyor21790Alnus rubraRed alder 8.0 n/a n/a No Viable Remove New ROW Not tagged, identified by surveyor21791Acer macrophyllumBigleaf maple 12.0 n/a n/a No Viable Remove New ROW21793Pseudotsuga menziesiiDouglas‐fir 30.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor21798Alnus rubraRed alder 14.0 n/a n/a No Viable Remove Grading Not tagged, identified by surveyor21948Pseudotsuga menziesiiDouglas‐fir 28.0 n/a n/a 19 No Viable Retain Not inventoried by TSI, data is from survey. Maintain LOD.AAcer macrophyllumBigleaf maple 24.0 Good Good 28 16 No Viable Retain Adjacent to tree #269, codominant stem of about 24", 12' into propertyBAcer macrophyllumBigleaf maple 20.0 Good Good 18 13 No Viable Retain Adjacent to tree #269, 18' into propertyTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 74 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason NotesCAcer macrophyllumBigleaf maple 23.0 20, 8, 8 Good Good 28 15 No Viable Retain Adjacent to tree #269, 2 trees w shared canopy, 20 inches on one w two 8 inch stems, 14 ft into propDAcer macrophyllumBigleaf maple 23.0 Good Good 25 15 No Viable Retain Adjacent to tree #274, 12' over property lineEPseudotsuga menziesiiDouglas‐fir Good Good 23 0 No Viable Retain Adjacent to tree #322, 14' into propertyFPseudotsuga menziesiiDouglas‐fir 32.0 Good Good 31 21 Yes Viable Retain Adjacent to tree #327, 19' over property lineGPseudotsuga menziesiiDouglas‐fir 19.2 Good Good 23 13 No Viable Retain Adjacent to tree #327, 20' over property lineHAcer macrophyllumBigleaf maple 15.0 Good Good 22 10 No Viable Retain Adjacent to tree #327, 20' over property lineIAcer macrophyllumBigleaf maple 9.0 Good Good 21 6 No Viable Retain Adjacent to tree #327, 20' over property lineJAcer macrophyllumBigleaf maple 10.0 Good Good 24 7 No Viable Retain Adjacent to tree #327, 22' over property lineKAcer macrophyllumBigleaf maple 14.0 Good Good 26 9 No Viable Retain Adjacent to tree #327, 20' over property lineLAcer macrophyllumBigleaf maple 19.0 Good Good 24 13 No Viable Retain Adjacent to tree #327, 20' over property lineMPseudotsuga menziesiiDouglas‐fir 35.0 Good Good 19 23 Yes Viable Retain Adjacent to tree #328, 5' over property line, kink in trunk 20'NAcer macrophyllumBigleaf maple 15.0 Good Good 26 10 No Viable Retain Adjacent to tree #328, 10' over property lineOAcer macrophyllumBigleaf maple 28.3 20, 20 Good Good 25 19 No Viable Retain Adjacent to tree #613, straddles property lineTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 75 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason NotesPThuja plicataWestern redcedar 10.0 Good Good 10 7 No Viable Remove Adjacent to tree #613, straddles property lineQAcer macrophyllumBigleaf maple 16.0 Fair Fair 20 11 No Viable Remove Adjacent to tree #613, canopy overhangs by 15'RPseudotsuga menziesiiDouglas‐fir Good Good 10 0 No Viable Retain Adjacent to tree #861, grouping of Douglas‐firs, overhangs property by5‐10'SPseudotsuga menziesiiDouglas‐fir Good Good 15 0 No Viable Retain Adjacent to tree #903, cluster of Douglas‐firs overhangs by 15'TThuja plicata, Pseudotsuga menziesii, Acer macrophyllumWestern redcedar, Douglas‐fir, Bigleaf maple11, 8, 22 Good Good 15‐20 0 No Viable Retain Adjacent to tree #904, cluster of trees overhanging site by 15‐20'UPseudotsuga menziesiiDouglas‐fir 17.0 Good Good 15 11 No Viable Retain Adjacent to tree #922, 15' from property lineVPseudotsuga menziesiiDouglas‐fir 30.0 Good Good 19 20 Yes Viable Retain Adjacent to tree #937, "Posted no trespassing" sign, canopy overhangs property lineWThuja plicataWestern redcedar Good Good 10 0 No Viable Retain Adjacent to tree #951, ~25 Western redcedars along property line, crosses by 8‐10'XPseudotsuga menziesiiDouglas‐fir 28.0 Good Good 6 19 No Viable Retain Overhangs property lineTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 76 of 77www.treesolutions.net206‐528‐4670
Table of TreesForest Terrace Plat (parcel 0423059142)Renton, WA 98059Initial Inventory: July 2016 Table Updated: 11.7.2019Tree ID Scientific Name Common NameDSH (inches)Multistem DSH (inches)Health ConditionStructural ConditionDripline Radius (feet)Min Limits of Disturbance if only disturbed on one side (ft)Landmark (Y/N)Viable (Y/N)Proposed ActionRemoval Reason NotesYPseudotsuga menziesiiDouglas‐fir 29.0 Good Good 30 Viable Retain Dripline possibly overhangs, not clear. Measured just in caseTree Solutions, Inc.2940 Westlake Ave. N (Suite #200) Seattle, WA 98109Page 77 of 77www.treesolutions.net206‐528‐4670
Arborist Report
Addendum #3 for Forest
Terrace prepared by
Tree Solutions, Inc.
dated February 24, 2020
6.4
115
342
18"F 10510
3
18
27
38
43
41
37
31
29
70 71
74
7681
80
83
84
14"F
10626
42
48 54
55
63
65 85
178
177
175176
173
170
160159
169
183
180
58
60
112118
107110
126
148
209
151 117
150
190
192
194
199
134
144 142
143
136
96
137
138
146
215
206
204
207
208
957
706
954
952
956
951
955
949(20660)
933
947
935
937
926
922
921
928
918
917
932
737
738750
739
746
734
705
703
697
698
426
708(20727)
709
712
405
713
714724
732
735
742
736
745
764
755
756
718
383
385
386
390
292
289
420
287
261 263 286
285
402
398
397
439
441
889
892
893
904
907
906
912
913
901883
886
881
880
882
878
858
824
859
826
781 780
865
749
868
782
779
765
776
382
377
799
373
351
242
376
256
257
258
847
255
250
854
238
247
245
873
230229227
853
347
362
798
363
786
785
358
784
359
352
354
795
356
367
789
365
790
368
794
369
793
372
374(21146)
788 769772
775773
774
771
301
297
283
281
284
276
271
269264
270
268
237
282
236
233
239
216
217
221
128
86
98
89
102
104
88
97
158
232
246
300
353
427
272
10"A
21286
16"M
21299
32"F 1050614"A 10509
24"F
10561 388
387
389
391
393
288
259
260
251231
228
226
222
220
344(21100)
343
341
360
361
357
355
349
350 348
364
366 791
796 777
770
8"F 20994
778
763
757
767
723
722
721
720
719759
761
758
762768
766
375
371
370 379
378
346
345
244
241240 243
248
249
392
384
394
395
396
381
380
717
716
715
6"M 20889
429
423
424
408
407
425
400
399
401
410 411
412
403 404
797
787
94
93
92
87
90
91
125
124
123
127
122
121 119
12099
95
129
130
131
109
108
106
111
113
114139
140
105
103101
857
855 856
874
16"F
21071
876875
877
871
872
870 869
867
866
864
863
862861860
884
885
896
879 894
895
905897
902
898
900
899
903
908
909
911
910
915
916
914
931
930929
920
919
927
938
936
943
950
948934 953
741
748
747
890
888
887
14",12"A
20992
18"F
20902
891
751
752
827823
829
828
830
18"F 20944831832
851
850
849
848 833
834
816
162
171
172
174
179
82
79
75
64
62
61
57 59
181
182
191
53
52196
195197
51
49
47
50
198193
203
205
39
564445
46
299295294291290
293418415416
414 421413417
422
440
311
298
419
296
733
699
700
711
710
225
219
760
406
696
707
740
825
852
40
164
100
946
944941
942939924
817
821
792
73
26
28
25
24
23
4
2(10514)
1
8
5
9
7
6
21
6"F
10519
20
19
22
69(10601)
16
15
14
1213 6"F
10522
218
223
224
235
252
253
254 265
266 6"M
21281
8"M
21283
262
280
273
(21242)
12"A
10745
200
201 202
67 77
78
275
34
33
35
36
695701
702
704
731
729
728
727
726 725
754 743(20711)744
753 730
783
800
801802
803
804
807
812 811810 806
805
815
813
814
840
842843
844845
846
835
841 838 808
809
836
837
163161157155
156
153
154166167
165
186
168185
184
189
188
187
149147
210
211212
213
145
214 135
133 132
141
152
116
30
277
278 279
818
819
820
32
66
72
945940
925
923
267
839
10"C
20661
10"A
20659
10
68
11
17
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLATPULTE GROUP, INC3535 FACTORIA BLVD S.E., #600BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000812/25/2020
FOREST TERRACE PLAT
Tree A
Trees
B, C, D, E
Tree F
Tree G
Tree H
Subject area for site
assessment on 02.19.2020
Notes made by Katie Hogan of
Tree Solutions Inc on February
19, 2020. Tree locations for
adjacent site trees are
approximate and should not
be used for any design related
decisions. Refer to provided
Table of Trees for specific
details.
- off-site tree assessed, location
approximate
Table of TreesForest Terrace2611 Union Ave NE, Renton, WA 98059, USAArborist: K. HoganDate of Inventory: 02.19.2020Table Prepared: 02.24.2020DSH (Diameter at Standard Height) is measured 4.5 feet above grade. Letters are used to identify trees on neighboring property with overhanging canopies.Dripline is measured from the center of the tree to the outermost extent of the canopy.Tree ID Scientific Name Common NameDSH (inches)Dripline Radius (feet) Location Notes Recommendations 02.24.2020APseudotsuga menziesiiDouglas‐fir 24.0 12 West of LOT 1222 ft from property line. No canopy over site. NoneBPseudotsuga menziesiiDouglas‐fir 10.0 8 West of LOT 1225 ft from property line. No canopy over site. NoneCPseudotsuga menziesiiDouglas‐fir 12.0 10 West of LOT 1225 ft from property line. No canopy over site. NoneDPseudotsuga menziesiiDouglas‐fir 12.0 10 West of LOT 1224 ft from property line. No canopy over site. NoneEPseudotsuga menziesiiDouglas‐fir 8.0 10 West of LOT 1224 ft from property line. No canopy over site. NoneFArbutus menziesii Pacific madrone 26.0 45 West of LOT 1225 ft from tree #45, 20 ft from property line. Canopy overhangs site by 25 ftShow on site plans; determine whether clearance pruning is required; impacts from proposed retaining wall minimalGThuja plicataWestern redcedar 32.0 20 West of LOT 1230 ft from tree #200, 16 ft from property line. Canopy overhangs site by 4 ftShow on site plans; minimal disturbances proposed in this areaHAcer macrophyllumBigleaf maple 7.5 16 West of LOT 1110 ft from property line. No canopy over site. NoneTree Solutions, Inc.2940 Westlake Ave. N #200 Seattle, WA 98109Page 1 of 1www.treesolutions.net206‐528‐4670
Geotechnical
Engineering Review
prepared by Terra
Associates, Inc. dated
February 28, 2020
6.5
February 28, 2020
Project No. T-7677
Mr. Jim Sprott
Pulte Homes of Washington, Inc.
3535 Factoria Blvd SE, Suite 110
Bellevue, Washington 98006
Subject: Geotechnical Engineering Review
Forest Terrace
2611 Union Avenue NE
Renton, Washington
References: 1. Geotechnical Report, Vandermay, 2611 Union Avenue NE, Renton, Washington,
Project No. T-7677, prepared by Terra Associates, Inc., dated July 19, 2017
2. Civil Drawings, Forest Terrace Plat, Renton, Washington,
prepared by Barghausen Consulting Engineers, dated February 26, 2020
3. Lock + Load/Cut Rockery Wall Design, Forest Terrace, 2611 Union Avenue NE,
Renton, Washington, Project No. T-7677, prepared by Terra Associates, Inc.,
dated September 6, 2018 revised September 12, 2018
4. Storm Water Detention Vault Plans, Forest Terrace, Renton, Washington,
prepared by Site Structures, dated September 28, 2018
Dear Mr. Sprott:
As requested, we have reviewed the referenced drawings that were prepared for the project. Based on our review,
the project consists of redeveloping the site with 25 residential building lots, a stormwater detention vault, several
retaining walls, and associated access roadways and utilities. Grading to achieve the building lot and roadway
elevations will consist of cuts and fills from 1 to 30 feet.
The vertical grade transition along the south side of the property will be supported with maximum six-foot tall,
terraced cut rockeries with 2:1 (Horizontal:Vertical) slope between the walls. The vertical grade transition along
the north side of the property will be supported with maximum six-foot tall, terraced Keystone walls. Other grade
transitions will be supported with maximum 2:1 or flatter slopes. The Keystone walls were formerly Lock + Load
walls. The retaining wall design will be updated to Keystone Block walls in accordance with the updated grading
plans.
12220 113th Avenue NE, Ste. 130, Kirkland, Washington 98034
Phone (425) 821‐7777 • Fax (425) 821‐4334
Geotechnical
Engineering Review
prepare by Terra
Associates, Inc. dated
February 28, 2020
6.6
February 28, 2020
Project No. T-7677
Mr. Jim Sprott
Pulte Homes of Washington, Inc.
3535 Factoria Blvd SE, Suite 600
Bellevue, Washington 98006
Subject: Response to City of Renton Comments
Forest Terrace
2611 Union Avenue NE
Renton, Washington
References: 1. Geotechnical Report, Vandermay, 2611 Union Avenue NE, Renton, Washington,
Project No. T-7677, prepared by Terra Associates, Inc., dated July 19, 2017
2. Civil Drawings, Forest Terrace Plat, Renton, Washington,
prepared by Barghausen Consulting Engineers, dated February 26, 2020
3. Lock + Load/Cut Rockery Wall Design, Forest Terrace, 2611 Union Avenue NE,
Renton, Washington, Project No. T-7677, prepared by Terra Associates, Inc.,
dated September 6, 2018 revised September 12, 2018
4. Markup Summary 2-10-2020, Forest Terrace 2-10-20 Review 2,
prepared by the City of Renton, dated February 10, 2020
Dear Mr. Sprott:
As requested, we have reviewed the referenced comments listed in the Markup Summary from the City of Renton
regarding the project site. The following is our response to the geotechnical comments.
12220 113th Avenue NE, Ste. 130, Kirkland, Washington 98034
Phone (425) 821‐7777 • Fax (425) 821‐4334
Mr. Jim Sprott
February 28, 2020
Project No. T-7677
Page No. 2
Comment Sheet 2
The applicant’s geotechnical engineer shall review the proposed dispersion trench location with the rear
yard of lot 10 and provide any recommendations necessary to mitigate impacts to the retaining wall or
conveyance issues to downstream property owners. The geotechnical analysis of the dispersion trench
shall be submitted with the civil construction permit application and reviews and approved by the current
planning project manager prior to permit issuance. Additional, include recommendations for dispersion
trench in tract B.
Response
We have reviewed the location of the dispersion trenches located on Lot 10 and in Tract B. The trench located on
Lot 10 is located on the downslope side of the proposed retaining wall just south of a forested area. The trench
will be used to allow the surface water from the western southern slopes to slowly discharge. Based on the
location and configuration of the dispersion trench, it is our opinion that its location is suitable for the site and
should not negatively impact the retaining wall or downstream property.
The trench located in Tract B is located on the downslope side of a fill slope approximately 25 feet from the
northern property line. The trench will be used to allow surface water from Shelton Avenue NE and a portion of
the sidewalk to slowly discharge. The open space between the dispersion trench and the property line will either
be left in its current native condition or will be properly landscaped in accordance with the landscaping plans.
Based on the location and configuration of the dispersion trench, it is our opinion that its location is suitable for
the site and should not negatively impact the slope or downstream property.
Comment Sheet 2
The applicant’s geotechnical engineer shall review the project’s construction plans to verify compliance
with the geotechnical report(s). The geotechnical engineer shall submit a sealed letter stating that he/she
has reviewed the construction plans and in their opinion the plans and specifications meet the intent of
the report(s).
Response
We have completed a plan review of the construction plans. Our review is attached as a separate letter.
Comment Sheet 15
Unable to locate detail or analysis in geotechnical report. Provide all relevant details stamped by
geotechnical engineer on plans for cut and fill walls and rockeries. Provide details and analysis in
geotechnical report as well.
Response
The detail in question is for an additional surface drain to be located at the top of the cut rockery walls. This drain
is to ensure that the surface water from the upper slopes does not run down the face of the rockery and cause
unwanted erosion. The analysis for the cut rockery walls was not included in the geotechnical report but was
included in the referenced Lock + Load/Cut Rockery Wall design report. The referenced detail for the surface
drain has little to no impact on the rockery analysis as it is an independent drain that is separated from the rockery
drain by a layer of bentonite to ensure the two drain systems behave, as intended.
Forest Terrace Plat
Storm Water Detention
Vault Calculations
prepared by Site
Structures dated
October 21, 2019
6.7
Forest Terrace Plat
Storm Water Detention
Vault Plans prepared by
Site Structures dated
February 25, 2020
6.8
National Storm Water
Quality Program Storm
Water Pollution
Prevention Plan (SWPPP)
dated March 11, 2020
6.9
PulteGroup Inc., 2017 SWPPP MM/DD/YYYY
NATIONAL STORM WATER QUALITY PROGRAM
STORM WATER POLLUTION PREVENTION PLAN
(SWPPP)
Forest Terrace
2611 Union Avenue N.E
Renton WA 98059
WAR ######
Prepared for:
Pulte Homes, Inc.
3535 Factoria Blvd SE, Suite 600
Bellevue, WA 98006
Prepared for Pulte Homes by:
__________________Date of Signature: 3/11/2020
Approved by Pulte Homes:
________________________________________Approval Date: ___________________
i
PulteGroup Inc., 2017 SWPPP 8/14/2019
TABLE OF CONTENTS
SECTION 1.0 STORM WATER POLLUTION PREVENTION PLAN REQUIREMENTS
1.1 INTRODUCTION
1.2 CONTACT INFORMATION
1.3 NOTICE OF INTENT
1.4 PLAN CERTIFICATION
1.5 SWPPP AVAILABILITY
1.6 SWPPP AMENDMENTS
1.7 RETENTION OF RECORDS
1.8 NOTICE OF TERMINATION
1.9 OTHER
SECTION 2.0 SITE AND ACTIVITY DESCRIPTION
2.1 SITE DESCRIPTION
2.2 SEQUENCE OF PROPOSED CONSTRUCTION ACTIVITIES
2.3 POTENTIAL CONSTRUCTION SITE POLLUTANTS
2.4 OTHER
SECTION 3.0 CONTROL MEASURES/ MANAGEMENT PRACTICES
3.1 SCHEDULE FOR BMP IMPLEMENTATION
3.2 EROSION AND SEDIMENT CONTROL
3.2.1 Erosion Controls
3.2.2 Sediment Controls
3.2.3 Drainage Controls and Velocity Dissipation Devices
3.2.4 Wind Erosion Controls
3.2.5 BMPs to Minimize Off-Site Tracking
3.2.6 Permanent Site Stabilization
3.2.7 Protect Low Impact Development (LID) BMPs
3.3 NON-STORM WATER MANAGEMENT
3.3.1 Materials and Waste Management BMPs
3.3.2 Paint and Paint Waste Management
3.3.3 Sanitary Waste Management
3.3.4 Spill Prevention and Response
3.3.5 Concrete Materials and Concrete Waste Management
3.3.6 Paving Operations Management
3.3.7 Management of Landscape Products
3.3.8 Vehicle and Equipment Cleaning
3.3.9 Vehicle and Equipment Fueling, Maintenance, and Storage
3.3.10 Dewatering and Ponded Water Management
3.4 POST-CONSTRUCTION STORM WATER MANAGEMENT MEASURES
3.5 COMPLIANCE WITH STATE AND LOCAL PLANS
3.6 OTHER
ii
PulteGroup Inc., 2017 SWPPP 8/14/2019
SECTION 4.0 MAINTENANCE, REPAIR, AND INSPECTION
4.1 MAINTENANCE
4.2 STORM MAINTENANCE AND REPAIR
4.3 INSPECTIONS1
4.4 OTHER
SECTION 5.0 TRAINING
SECTION 6.0 TRADE CONTRACTOR COMPLIANCE
APPENDICES
APPENDIX A VICINITY MAP, SITE MAP, BMP MAP
APPENDIX B CONSTRUCTION GENERAL PERMIT AND BLANK FORMS
APPENDIX C SWPPP AMENDMENT LOG
APPENDIX D DOCUMENTATION OF PERMIT ELIGIBILITY RELATED TO
TOTAL MAXIMUM DAILY LOADS
APPENDIX E CONSTRUCTION SCHEDULE
APPENDIX F CONSTRUCTION ACTIVITIES AND ASSOCIATED POLLUTANTS
APPENDIX G BMP REFERENCE SHEETS
APPENDIX H DESCRIPTION OF POST-CONSTRUCTION BMPS
APPENDIX I RESPONSIBLE PARTIES AND CONTRACTORS
APPENDIX J COMPLETED SITE INSPECTION REPORTS
APPENDIX K OTHER
1 At a minimum, the Site should be inspected at the frequency required by the Applicable Permit. The SWPPP should
specify the inspection frequency (and when the frequency may be reduced, including waivers) based on the schedule in the
Applicable Permit. If no guidance is provided in the Applicable Permit regarding storm-event related inspections, the Site
should be inspected within 24 hours of the end of a storm that is 0.5 inches or greater (or equivalent snowfall) per 24 hour
period.
1-1
PulteGroup Inc., 2017 SWPPP 8/14/2019
SECTION 1.0 STORM WATER POLLUTION PREVENTION PLAN
REQUIREMENTS
1.1.INTRODUCTION.
The Storm Water Pollution Prevention Plan (SWPPP) is an integral part of the Washington State
Construction General Storm Water Permit (General Permit) and plays a crucial role in
minimizing the pollution of storm water runoff from Construction Sites. A properly prepared
and implemented SWPPP assists developers with meeting storm water pollution prevention
goals. The SWPPP:
provides a Site description that identifies potential sources of pollution to storm water
discharges associated with Construction Site Activities; and
identifies and requires the implementation of appropriate measures to reduce potential
pollutants in storm water discharges to promote compliance with the terms and conditions
of the General Permit.
The goal of the General Permit is to protect the quality and beneficial uses of the nation’s surface
water resources from polluted storm water runoff and from non-storm water discharges
associated with Construction Activities. To achieve this goal, the General Permit requires
operators to plan and implement appropriate pollution prevention and control practices for storm
water runoff and non-storm water discharges throughout Construction. These Best Management
Practices (BMPs) are aimed at controlling erosion, reducing sediment transport, implementing
good housekeeping practices, and requiring Trade Contractor compliance. At least one Site-
specific SWPPP should be prepared for each Site covered by the General Permit. SWPPP(s)
should be applicable for Land Development and/or Vertical Construction, and should use BMPs
appropriate for specific Site conditions at all stages of Construction.
This SWPPP was prepared to comply with the provisions of the NPDES Construction
Stormwater General Permit, issued by the Washington State Department of Ecology for storm
water discharges associated with Construction Site Activities. This SWPPP was prepared
specifically for Forest Terrace (WAR ######) and has been developed in accordance with sound
engineering practices to address applicable storm water quality requirements. Implementation
and maintenance of this SWPPP should provide Pulte Homes of Washington, Inc. (Pulte), with
the framework for reducing storm water pollution throughout Construction, from the
commencement of Construction Activities until the Site is final stabilized and permit coverage is
terminated.
The development of this SWPPP was guided by the requirements of the National Pulte
SWPPP Format.
1-2
PulteGroup Inc., 2017 SWPPP 8/14/2019
Prepared for Pulte Homes by:
DATE: 03/11/2020
Signature of person who prepared SWPPP
TOM SHUGRUE
Printed name of person who prepared SWPPP
Preparer company name & address:WaterTechNW Environmental Consulting, LLC
P.O. Box 2874
Kirkland, WA 98083
1-3
PulteGroup Inc., 2017 SWPPP 8/14/2019
1.2 CONTACT INFORMATION.
A.One Storm Water Trained Pulte employee with current stormwater certification should be
designated as a Site Storm Water Representative (SSWR) and a different individual
designated as a Division Storm Water Compliance Executive (DCE) for the Site. Contact
information for the SSWR and relevant Designees (e.g., Storm Water Consultants who
complete Site Inspections) should be provided in this Section.
B.Distinguish between Land Development SSWRs and Vertical Construction SSWRs, as
appropriate.
C.The name and contact information for the SSWR for a Site should be posted at a conspicuous
location on the site, such as at the construction office, or an entrance or exit if the Site does
not have a construction office.
Name of DCE:Ryan Kohlmann
Job Title:Director, Land Planning & Entitlement
Name of SSWR:
Job Title:___________________________
Land Development SSWR Vertical Construction SSWR
(check all that apply)
Office Address:3535 Factoria Blvd SE, #600
Bellevue, WA 98006
Office Phone No:__________________________
Mobile Phone No:__________________________
Facsimile No:___________________________
e-mail Address:_______________________
Name of SSWR:___________________________
Job Title:___________________________
Land Development SSWR Vertical Construction SSWR
(check all that apply)
Office Address:
___________________________
___________________________
Office Phone No:___________________________
Mobile Phone No:___________________________
Facsimile No:___________________________
e-mail Address:___________________________
1-4
PulteGroup Inc., 2017 SWPPP 8/14/2019
(as applicable)
Office Address:3535 Factoria Boulevard SE, Suite 600
Bellevue, WA 98006
Office Phone Number:425 216 3428
Mobile Phone Number:425-922-9805
Facsimile Number:
e-mail Address:Ryan.Kohlmann@pultegroup.com
Name of Designee:Tom Shugrue CESCL 8182027
Company Name & Job Title:WaterTechNW Environmental Consulting, LLC
Office Address:P.O. Box 2874
Kirkland, WA 98083
Office Phone Number:206 972 3720
Mobile Phone Number:206 972 3720
Facsimile Number:
e-mail Address:watertechnw@gmail.com
D.SSWRs have management responsibility for overseeing efforts and actions to achieve and
maintain compliance with Storm Water Requirements at the Site. Each SSWR should:
1)be a Pulte employee;
2)be a Certified Erosion and Sedimentation Control Lead (CESCL) from the
Washington State Department of Ecology;
1-5
PulteGroup Inc., 2017 SWPPP 8/14/2019
3)be Pulte Storm Water Trained;
4)be authorized by Pulte and have the responsibility to supervise all work necessary to
meet Storm Water Requirements at the Site, including those performed by Trade
Contractors, sub-contractors, and Storm Water Consultants.
5)be authorized by Pulte and have the responsibility to order employees, Trade
Contractors, sub-contractors, and Storm Water Consultants to take appropriate
Responsive Action to address a failure to comply with Storm Water Requirements,
including requiring any such person to cease or correct a violation of Storm Water
Requirements, and to order or recommend such other actions or sanctions as
necessary to meet Storm Water Requirements;
6)be familiar with and have the authority and responsibility to update the Site’s SWPPP
(refer to Section 1.6); and,
7)be the point of contact at the Site for regulatory officials, Pulte employees, Trade
Contractors, sub-contractors, and Storm Water Consultants regarding Storm Water
Requirements.
E.See Appendix I for detailed SWPPP related responsibilities.
F.Additional SSWR Requirements:
1)Only one SSWR shall be active per permit.
2)Each Site SSWR will be responsible for the entire geographic area onsite.
3)Prior to a new SSWR beginning work at a Site, or a current SSWR completing their
role at the Site, each SSWR should review and confirm their respective boundaries of
authority. Discrepancies should be resolved immediately. The SWPPP and signage
with SSWR name and contact information should be amended when a new SSWR
starts work at a Site. Duties and areas of responsibility outlined in the SWPPP should
be updated as necessary to reflect the current stage of construction and changing
boundaries of jurisdiction of the respective SSWRs to ensure a smooth transition from
Land Development to Vertical Construction. SSWRs should coordinate their
transition, as necessary, to ensure that all areas of the Site are managed per the
Washington State Department of Ecology (Ecology) Storm Water Management
Manual for Western Washington (SWMM) and the General Permit until permit
coverage is terminated.
If a Land Development SSWR is engaged at the start of a project, that SSWR retains
responsibility at the Site until the last developable lot at the Site is handed off to a
Vertical Construction SSWR. At that point, the SWPPP and signage with the SSWR
name and contact information should be amended to reflect the hand-off.
1-6
PulteGroup Inc., 2017 SWPPP 8/14/2019
If a SSWR must be replaced, a new SSWR, who has a CESCL certification, must
replace the incumbent within 7 days to meet the inspection and reporting
requirements of Ecology. The gap in designation does not excuse non-compliance
with any other stormwater requirement.
4)Each SSWR must have management responsibility for overseeing the efforts and
actions required for the site to maintain compliance with Storm Water Requirements.
SSWRs may not delegate the performance of specific storm water compliance tasks
to Designees. All SSWRs are responsible for reviewing the SWPPP.
1-7
PulteGroup Inc., 2017 SWPPP 8/14/2019
1.3.NOTICE OF INTENT.
A.A Notice of Intent (NOI) must be submitted to Ecology prior to any ground-disturbing
activities onsite.
B.The NOI must be submitted:
1)60 days prior to discharging stormwater from construction activities;
2)Prior to publication of the first public notice;
3)A 30 day public comment period follows the second public notice;
4)Coverage automatically commences the 31st day following the receipt of a
complete permit unless otherwise noticed by Ecology. The letter of coverage is
provided in Appendix B.
C.Any changes to the information provided in the NOI must be submitted to Ecology by
providing an updated NOI. Examples of the changes include, but are not limited to:
1)Changes to the Permittee’s mailing address;
2)Changes to the on-site contact person (SSWR) information; and
3)Changes to the area/acreage affected by construction activity.
D.Coverage under the General Permit may be transferred to one or more new operators by
submitting a Transfer of Coverage Form.
1-9
PulteGroup Inc., 2017 SWPPP 8/14/2019
1.4.PLAN CERTIFICATION.
Certification Statement
I certify under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gathered and evaluated the information submitted. Based on my inquiry of the person
or persons who manage the system, or those persons directly responsible for gathering
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including possibility of fine and imprisonment for knowing violations.
Signature
Ryan Kohlmann
Printed Name
Director, Land Planning & Entitlement
Title
1-10
PulteGroup Inc., 2017 SWPPP 8/14/2019
1.5.SWPPP AVAILABILITY.
A.The Permit Coverage Letter, Construction Stormwater General Permit, Site Log Book,
and SWPPP must be maintained onsite, or within reasonable access to the site, for use by
the operator or for on-site review by Ecology or the local jurisdiction. If the records are
not maintained on-site, the location of the SWPPP and these Records should be posted,
along with the name and contact information of all SSWR(s), in a conspicuous location at
the Site, such as the Site entrance or exit.
B.The Permittee must provide a copy of the plans and records to Ecology within 14 days of
receipt of a written request from Ecology.
C.The Permittee must provide a copy of plans and records to the public when requested in
writing. Upon receiving a written request from the public for the Permittee’s plans and
records, the Permittee must either:
1)Provide a copy of the plans and records to the requester within 14 days of a receipt
of the written request; or
2)Notify the requester within 10 days of receipt of the written request of the location
and times within normal business hours when the plans and records may be
viewed; and provide access to the plans and records within 14 days of receipt of
the written request; or
3)Within 14 days of receipt of the written request, the Permittee may submit a copy
of the plans and records to Ecology for viewing and/or copying by the requester at
an Ecology office, or a mutually agreed location. If plans and records are viewed
and/or copied at a location other than at an Ecology office, the Permittee will
provide reasonable access to coping services for which a reasonable fee may be
charged. The Permittee must notify requester within 10 days of receipt of the
request where the plans and records may be viewed or copied.
1-11
PulteGroup Inc., 2017 SWPPP 8/14/2019
1.6.SWPPP AMENDMENTS.
A.SWPPPs (including the Site maps) should be revised if, during inspections or
investigations by either the SSWR or any applicable regulatory authority determine that it
is or will be ineffective in eliminating or minimizing pollutants in stormwater discharges.
The Permittee must then:
1)Review the SWPPP for compliance with the General Permit and make appropriate
revisions within 7 days of the inspection or investigation.
2)Immediately begin implementing and maintaining source control and/or treatment
BMPs as soon as possible, addressing the problems no later than 10 days from the
inspection or investigation. If installation of necessary treatment BMPs is not
feasible within 10 days, Ecology may approve additional time when an extension
is requested by a Permittee within the initial 10-day response period,
3)Document BMP implementation and maintenance in the site log book.
The SWPPP must be modified whenever there is a change in design, construction,
operation, or maintenance at the construction site that has, or could have, a significant
effect on the discharge of pollutants from the site.
B.Amendments and revisions to the SWPPP are hand written on the BMP map and within
the SWPPP itself.
1-12
PulteGroup Inc., 2017 SWPPP 8/14/2019
1.7.RETENTION OF RECORDS.
A.SSWR/Pulte must retain records of all monitoring information (site log book, sampling
results, inspection reports/checklists, etc.), SWPPP, and any other documentation of
compliance with permit requirements for the entire life of the construction project and for
a minimum of three years following the termination of permit coverage. The information
must include all calibration and maintenance records, and all data used to complete the
application for this permit. This period of retention must be extended during the course
of any unresolved litigation regarding the discharge of pollutants by the Permittee or
when requested by Ecology.
1-13
PulteGroup Inc., 2017 SWPPP 8/14/2019
1.8.NOTICE OF TERMINATION.
A.The site is eligible for termination of coverage when it has met any of the following
conditions:
1)The site has gone final stabilization, all temporary BMPs have been removed
(except biodegradable BMPs clearly manufactured with the intention for the
material to be left in place and not interfere with maintenance or land use), and all
stormwater discharges associated with construction activity have been eliminated;
or
2)All portions of the site that have not undergone final stabilization per the above
requirement have been sold and/or transferred and the Permittee no longer has
operational control of the construction activity; or
3)For residential construction only, the Permittee has completed temporary
stabilization and the homeowners have taken possession of the residences.
B.When the site is eligible for termination, the Permittee must submit a complete and
accurate Notice of Termination (NOT) form, signed by a responsible corporate officer of
at least the level of vice president in the corporation, to:
Department of Ecology
Water Quality Program – Construction Stormwater
PO Box 47696
Olympia, WA 98504-7696
The termination is effective on the date Ecology receives the NOT form, unless Ecology
notifies the Permittee within 30 days that the termination request is denied because the
Permittee has not met the eligibility requirements noted in Section A above.
Permittees transferring the property to a new owner or operator/permittee are required to
complete and submit the Notice of Transfer form to Ecology, but are not required to
submit a Notice of Termination for this type of transaction.
C.Final Stabilization is defined as the establishment of a permanent vegetative cover, or
equivalent permanent stabilization measures (such as riprap, gabions, or geotextiles)
which prevent erosion.
1-14
PulteGroup Inc., 2017 SWPPP 8/14/2019
1.9.OTHER.
A.There are no additional permit requirements needing detail.
2-1
PulteGroup Inc., 2017 SWPPP 8/14/2019
SECTION 2.0 SITE AND ACTIVITY DESCRIPTION
2.1.SITE DESCRIPTION.
Project Site:Forest Terrace
Street Location:2611 Union Avenue N.E
City:Renton WA 98059
Receiving waterbody:May Creek/Cedar River/Lake Washington
The Forest Terrace project is a single-family residential project consisting of the
development of a forested area generally located between Union Avenue N.E. to the East,
single-family homes to the North and West, and Sierra Heights Elementary School to the
south. More specifically the site is located at 2611 Union Avenue N.E. Renton,
Washington 98059. The project area is approximately 13.4(±) acres in size. The proposed
project is to construct 25 single-family lots with associated roads, utilities, and
stormwater facilities. The project site is located within a portion of Section 4, Township
23 North, Range 5 East, Willamette Meridian, in the City of Renton, Washington.
Developable portions of the project will include areas outside of the existing PSE
easements and the area designated for the Perkins property. The property consists of one
existing tax parcel 042305-9142 and portions of a second tax parcel 042305-9114. On-
site vegetation consists of native trees such as Fir, Cedar, Hemlock, and Maple ranging in
size from saplings up to trunks 64 inches in diameter. Elevations range from 342 to 442
across the site. The site is mostly a steep hillside with slopes of up to 50 percent on the
south side of the site, with some gentler slopes of 5 percent on the northern side of the
site.
The King County Soils Conservation Service Soils Map for this area indicates that the
on-site soils are considered; Alderwood gravelly sandy loam with 8 to 15 percent slopes,
Alderwood gravelly sandy loam with 0 to 8 percent slopes, Everett very gravelly sandy
loam with slopes 0 to 8 percent, and Everett very gravelly sandy loam with 15 to 30
percent slopes.
On-site construction will include roadways with vertical curb and sidewalk, landscaping
tracts, a water quality facility, and two detention facilities. Additionally, stormwater catch
basins and storm pipes as well as water mains and sewer facilities will be constructed
onsite. There will be frontage improvements along Union Ave NE including stormwater
catch basins and storm pipes as well as pavement overlay, vertical curb and sidewalk. A
drainage swale will also be constructed on the west side of Union Ave NE along the
Dalpay Property.
The proposed construction activities include site demolition, preparation, TESC
installation, pavement and sidewalk construction, utility installation, stormwater
conveyance system design, vault construction, and wall construction.
2-2
PulteGroup Inc., 2017 SWPPP 8/14/2019
A.Vicinity Map, Site Map and Temporary Erosion and Sedimentation Control Maps are
located in Appendix A.
Table 2.1.1: Required Map Information
Required Element
unless not applicable due to site conditions Location in SWPPP
The direction of north, property lines, and existing structures and roads.Appendix A
Cut and fill slopes indicating the top and bottom of slope catch lines.Appendix A
Approximate slopes, contours, and direction of stormwater flow before and after
major grading activities.
Appendix A & BMP Map
Areas of soil disturbance and areas that will not be disturbed.Appendix A & BMP Map
Locations of structural and nonstructural controls (BMPs) identified in the SWPPP.Appendix A & BMP Map
Locations of off-site material, stockpiles, waste storage, borrow areas, and vehicle/
equipment storage areas.
TBD by contractor. Appendix A
Locations of all surface water bodies, including wetlands.Appendix A
Locations where stormwater or non-stormwater discharges off-site and/or to a
surface water body, including wetlands.
Appendix A
Location of water quality sampling station(s), if sampling is required by state or local
permitting authority.
Appendix A
Areas where final stabilization has been accomplished and no further construction-
phase permit requirements apply.
Appendix A
Location or proposed location of LID facilities Appendix A
2-3
PulteGroup Inc., 2017 SWPPP 8/14/2019
2.2.SEQUENCE OF PROPOSED CONSTRUCTION ACTIVITIES.
The intended sequence for major activities that disturb soils at the Site follows:
1.Prior to any construction activity, the Contractor shall schedule and attend a pre-
construction conference with the City of Renton.
2.Construct sediment pond and outfall and temporary or permanent fencing around
pond.
3.Install rock construction entrance.
4.Stockpile all erosion materials on-site.
5.Install check dams in existing off-site ditches.
6.Install filter fabric fence and protection fence as shown.
7.Clear and install buried utilities.
8.Construct interceptor ditches and temporary culverts and relocate as necessary during
construction.
9.Install storm drainage system and pond with interim catch basin protection.
10.Backfill sediment traps prior to building construction. Use structural fill to 95%
MDD where supporting foundations.
11.Install all other utilities.
12.Fine grade roads.
13.Install ATB.
14.Maintain sediment pond during building construction.
15.Install final paving.
16.On completion of building, stabilize unpaved areas with landscaping or hydroseeding
as permanent cover.
17.Clean out storm system including detention pond and structures when construction is
complete and site has been stabilized.
18.Remove remaining TESC facilities following site stabilization.
2-4
PulteGroup Inc., 2017 SWPPP 8/14/2019
2.3.POTENTIAL CONSTRUCTION SITE POLLUTANTS.
A.The two most common possible pollutants associated with this site are:
1)Sediment
2)Concrete wash-off
Please see Appendix F for a complete list of potential pollutant sources that may reasonably be
expected to affect the quality of storm discharge from the site.
B.There are no anticipated offsite sources of pollution offsite or outside of the construction
limits.
C.See section 3.0 for proposed BMPs to control storm water pollutants from leaving the
site.
2-5
PulteGroup Inc., 2017 SWPPP 8/14/2019
2.4.OTHER.
3-1
PulteGroup Inc., 2017 SWPPP 8/14/2019
SECTION 3.0 CONTROL MEASURES/ MANAGEMENT PRACTICES
The following subsections identify Best Management Practices (BMPs) for ensuring the site does
not violate surface water quality, ground water quality or sediment management standards. As
required by the Department of Ecology, the following subsection will describe thirteen (13)
elements that cover the general water quality protection strategies of limiting site impacts,
preventing erosion and sedimentation, and managing activities and sources. The 13 Elements and
the SWPPP subsections they are described and in are noted in table below:
Table 3.1: DOE Thirteen (13) Elements of Construction
Stormwater Pollution Prevention
Elements SWPPP
Subsection
Element #1 Mark Clearing Limits 3.2.2
Element #2 Establish Construction Access 3.2.5
Element #3 Control Flow Rate 3.2.3
Element #4 Install Sediment Controls 3.2.2
Element #5 Stabilize Soils 3.2.1
Element #6 Protect Slopes 3.2.1
Element #7 Protect Drain Inlets 3.2.2
Element #8 Stabilize Channels and Outlets 3.2.2
Element #9 Control Pollutants 3.3.1
Element #10 Control Dewatering 3.3.10
Element #11 Maintain BMPs 3.2
Element #12 Manage Project 3.2
Element #13 Protect LID BMPs 3.2.7
3-2
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.1. SCHEDULE FOR BMP IMPLEMENTATION.
A.The installation of the stabilized construction entrance and perimeter silt fence will take
place for one portion of the Site after the clearing and grubbing and necessary for
installation of these controls, but before the clearing and grubbing for the remainder of
the Site.
B.Clearing and grading will not occur in an area until it is necessary to proceed with
Construction in that area.
C.Sediment basin(s) will be installed prior to clearing and grading except as necessary to
install the BMPs.
D.Areas of the Site where Construction Activity temporarily ceases must be stabilized
within 7 days between May 1 and September 30 and within 2 days between October 1
and April 30.
E.Permanent controls such as riprap will be installed at storm sewer outfall structures prior
to any storm water discharges.
F.Controls will be implemented, modified, and maintained to reflect the current phase of
Construction.
G.Areas where Construction Activities permanently cease will be stabilized with pavement,
seed, or mulch within 7 days between May 1 and September 30 and within 2 days
between October 1 and April 30.
H.Perimeter controls will be actively maintained until final stabilization is achieved in
portions of the Site located upward of the perimeter control.
I.Temporary perimeter controls will be removed after final stabilization and any areas
disturbed during their removal will be stabilized.
3-3
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.2. EROSION AND SEDIMENT CONTROL.
All Erosion Control BMPs specified in Section 3.2 refer to controls listed and described in the
2014 DOE Manual, unless otherwise specified.
The following Elements 11 and 12 described below provide guidance on maintain BMP’s and
managing the project.
Element #11 – Maintain BMPs
All temporary and permanent erosion and sediment control BMPs shall be maintained and
repaired as needed to assure continued performance of their intended function. Maintenance and
repair shall be conducted in accordance with each particular BMPs specifications (attached).
Visual monitoring of the BMPs will be conducted at least once every calendar week and within
24 hours of any stormwater or non-stormwater discharge from the site. If the site becomes
inactive, and is temporarily stabilized, the inspection frequency will be reduced to once every
month.
All temporary erosion and sediment control BMPs shall be removed within 30 days after the
final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped
sediment shall be removed or stabilized on site. Disturbed soil resulting from removal of BMPs
or vegetation shall be permanently stabilized.
Element #12 – Manage the Project
Erosion and sediment control BMPs for this project have been designed based on the following
principles:
Design the project to fit the existing topography, soils, and drainage patterns.
Emphasize erosion control rather than sediment control.
Minimize the extent and duration of the area exposed.
Keep runoff velocities low.
Retain sediment on site.
Thoroughly monitor site and maintain all ESC measures.
Schedule major earthwork during the dry season.
In addition, project management will incorporate the key components listed below.
Seasonal Work Limitations
From October 1 through April 30, clearing, grading, and other soil disturbing activities
shall only be permitted if shown to the satisfaction of the local permitting authority that
silt-laden runoff will be prevented from leaving the site through a combination of the
following:
Site conditions including existing vegetative coverage, slope, soil type, and
proximity to receiving waters; and
Limitations on activities and the extent of disturbed areas; and
3-4
PulteGroup Inc., 2017 SWPPP 8/14/2019
Proposed erosion and sediment control measures.
Based on the information provided and/or local weather conditions, the local permitting
authority may expand or restrict the seasonal limitation on site disturbance.
Coordination with Utilities and Other Jurisdictions
Care has been taken to coordinate with utilities, other construction projects, and the local
jurisdiction in preparing this SWPPP and scheduling the construction work.
Inspection and Monitoring
All BMPs shall be inspected, maintained, and repaired as needed to assure continued
performance of their intended function. Site inspections shall be conducted by a person
who is knowledgeable in the principles and practices of erosion and sediment control.
This person has the necessary skills to:
Assess the site conditions and construction activities that could impact the quality
of stormwater, and
Assess the effectiveness of erosion and sediment control measures used to control
the quality of stormwater discharges.
A Certified Erosion and Sediment Control Lead shall be on-site or on-call at all times.
Whenever inspection and/or monitoring reveals that the BMPs identified in this SWPPP
are inadequate, due to the actual discharge of or potential to discharge a significant
amount of any pollutant, appropriate BMPs or design changes shall be implemented as
soon as possible.
Maintaining an Updated Construction SWPPP
This SWPPP shall be retained on-site or within reasonable access to the site.
The SWPPP shall be modified whenever there is a change in the design, construction,
operation, or maintenance at the construction site that has, or could have, a significant
effect on the discharge of pollutants to waters of the state.
The SWPPP shall be modified if, during inspections or investigations conducted by the
owner/operator, or the applicable local or state regulatory authority, it is determined that
the SWPPP is ineffective in eliminating or significantly minimizing pollutants in
stormwater discharges from the site. The SWPPP shall be modified as necessary to
include additional or modified BMPs designed to correct problems identified. Revisions
to the SWPPP shall be completed within seven (7) days following the inspection.
3-5
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.2.1 Erosion Controls
Erosion control should be maintained using interim and permanent stabilization practices.
Erosion control practices should be implemented on-site per the Construction Schedule located
in Appendix E. In addition, dates of when major grading activities occur, dates of when
construction activities temporarily or permanently cease on a portion of the Site, and dates when
stabilization measures are initiated should be recorded in Appendix E.
Elements 5 and 6 described below provide guidance for implementing interim and permanent
stabilization practices and the BMP map in Appendix A shows where stabilization practices are
expected to occur.
Element #5 – Stabilize Soils
Exposed and unworked soils shall be stabilized with application of effective BMPs to prevent
erosion throughout the life of the project. The specific BMPs for soil stabilization that shall be
used on this project include:
Temporary and Permanent Seeding (BMP C120)
Mulching (BMP C121)
Plastic Covering (BMP C123)
Soils will be stabilized throughout the duration of the project.
Alternate soil stabilization BMPs may be selected by the onsite inspector in the event the
BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the
requirements set forth in the General Permit. To avoid potential erosion and sediment control
issues that may cause a violation(s) to the General Permit, the SSWR will promptly initiate the
implementation of one or more of the alternative BMPs after the first sign that existing BMPs are
ineffective or failing.
The project site is located west of the Cascade Mountain Crest. As such, no soils shall remain
exposed and unworked for more than 7 days during the dry season (May 1 to September 30) and
2 days during the wet season (October 1 to April 30). Regardless of the time of year, all soils
shall be stabilized at the end of the shift before a holiday or weekend if needed based on weather
forecasts.
In general, cut and fill slopes will be stabilized as soon as possible and soil stockpiles will be
temporarily covered with plastic sheeting. All stockpiled soils shall be stabilized from erosion,
protected with sediment trapping measures, and where possible, be located away from storm
drain inlets, waterways, and drainage channels.
Element #6 – Protect Slopes
All cut and fill slopes will be designed, constructed, and protected in a manner that minimizes
erosion. The following specific BMPs will be used to protect slopes for this project:
Temporary and Permanent Seeding (BMP C120)
3-6
PulteGroup Inc., 2017 SWPPP 8/14/2019
Mulching (BMP C121)
Plastic Covering (BMP C123)
Unstable slopes will be protected throughout the duration of the project.
Alternate BMPs for marking the clearing limits may be selected by the onsite inspector in the
event the BMP(s) listed above are deemed ineffective or inappropriate during construction to
satisfy the requirements set forth in the General Permit. To avoid potential erosion and sediment
control issues that may cause a violation(s) to the General Permit, the SSWR will promptly
initiate the implementation of one or more of the alternative BMPs after the first sign that
existing BMPs are ineffective or failing.
3.2.2 Sediment Controls
Sediment control should be implemented, to the degree attainable, to retain/detain flows or
otherwise limit runoff and the discharge or pollutants from exposed areas of the site.
Elements 1, 4, 7, and 8 described below provide guidance for implementing interim and
permanent stabilization practices and the BMP map located in Appendix A shows where
stabilization practices are expected to occur.
Element #1 – Mark Clearing Limits
To protect adjacent properties and to reduce the area of soil exposed to construction, the limits of
construction will be clearly marked before land-disturbing activities begin. Trees that are to be
preserved, as well as all sensitive areas and their buffers, shall be clearly delineated, both in the
field and on the plans. In general, natural vegetation and native topsoil shall be retained in an
undisturbed state to the maximum extent possible. The BMPs relevant to marking the clearing
limits that will be applied for this project include:
High Visibility Plastic of Metal Fence (BMP C103)
Preserving Natural Vegetation (BMP C101)
Fence will be installed at the clearing limits prior to construction.
Alternate BMPs for marking the clearing limits may be selected by the onsite inspector in the
event the BMP(s) listed above are deemed ineffective or inappropriate during construction to
satisfy the requirements set forth in the General Permit. To avoid potential erosion and sediment
control issues that may cause a violation(s) to the General Permit, the SSWR will promptly
initiate the implementation of one or more of the alternative BMPs after the first sign that
existing BMPs are ineffective or failing.
Element #4 – Install Sediment Controls
All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal
BMP before leaving the construction site or prior to being discharged to an infiltration facility.
The specific BMPs to be used for controlling sediment on this project include:
3-7
PulteGroup Inc., 2017 SWPPP 8/14/2019
Silt Fence (BMP C233)
Storm Drain Inlet Protection (BMP C220)
Straw Wattles (BMP C235)
Interceptor Dike and swale (BMP C200)
Pipe Slope Drains (BMP C204)
Outlet Protection (BMP C209)
Sediment Trap (BMP C240)
Silt fence will be installed at the base of all slopes which have the potential to produce runoff.
The fence will conform to Ecology standards. Storm drain inlets will be filtered to trap
sediment.
Alternate sediment control BMPs may be selected by the onsite inspector in the event the
BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the
requirements set forth in the General Permit. To avoid potential erosion and sediment control
issues that may cause a violation(s) to the General Permit, the SSWR will promptly initiate the
implementation of one or more of the alternative BMPs after the first sign that existing BMPs are
ineffective or failing.
In addition, sediment will be removed from paved areas in and adjacent to construction work
areas manually or using mechanical sweepers, as needed, to minimize tracking of sediments on
vehicle tires away from the site and to minimize washoff of sediments from adjacent streets in
runoff.
In some cases, sediment discharge in concentrated runoff can be controlled using permanent
stormwater BMPs (e.g. infiltration swales, ponds, trenches). Sediment loads can limit the
effectiveness of some permanent stormwater BMPs, such as those used for infiltration or
biofiltration; however, those BMPs designed to remove solids by settling (wet ponds or detention
ponds) can be sued during the construction phase. When permanent BMPs will be used to
control sediment discharge during construction, the structure will be protected from excessive
sedimentation with adequate erosion and sediment control BMPs. Any accumulated sediment
shall be removed after construction is complete and the permanent stormwater BMP will be
restabilized with vegetation per applicable design requirements once the remainder of the site has
been stabilized.
The following BMPs will be implemented as end-of-pipe sediment controls as required to meet
permitted turbidity limits in the site discharge(s). Prior to the implementation of these
technologies, sediment sources and erosion control and soil stabilization BMP efforts will be
maximized to reduce the need for end-of-pipe sedimentation controls.
Temporary Sediment Pond (BMP C241)
Element #7 – Protect Drain Inlets
All storm drain inlets and culverts made operable during construction shall be protected to
prevent unfiltered or untreated water from entering the drainage conveyance system. However,
the first priority is to keep all access roads clean of sediment and keep street wash water separate
3-8
PulteGroup Inc., 2017 SWPPP 8/14/2019
from entering storm drains until treatment can be provided. Storm Drain Inlet Protection (BMP
C220) will be implemented for all drainage inlets and culverts that could potentially be impacted
by sediment-laden runoff on and near the project site. The following inlet protection measures
will be applied on this project:
Drop Inlet Protection
o Excavated Drop Inlet Protection
o Block and Gravel Drop Inlet Protection
o Gravel and Wire Drop Inlet Protection
o Catch Basin Filters
Culvert Inlet Sediment Trap
Alternative BMP not included in Ecology’s Stormwater Management Manual for
Western Washington or in the King County Surface Water Design Manual.
If the BMP options listed above are deemed ineffective or inappropriate during construction to
satisfy the requirements set forth in the General NPDES Permit, or if no BMPs are listed above
but deemed necessary during construction, the SSWR shall implement one or more alternative
BMP inlet protection options.
Element #8 – Stabilize Channels and Outlets
Where site runoff is to be conveyed in channels, or discharged to a stream or some other natural
drainage point, efforts will be taken to prevent downstream erosion. The specific BMPs for
channel and outlet stabilization that shall be used on this project include:
Interceptor Dike & Swale (BMP C200)
Check Dams (BMP C207)
Outlet Protection (BMP C209)
Alternate channel and outlet stabilization BMPs may be selected by the onsite inspector in the
event the BMP(s) listed above are deemed ineffective or inappropriate during construction to
satisfy the requirements set forth in the General Permit. To avoid potential erosion and sediment
control issues that may cause a violation(s) to the General Permit, the SSWR will promptly
initiate the implementation of one or more of the alternative BMPs after the first sign that
existing BMPs are ineffective or failing.
The project site is located west of the Cascade Mountain Crest. As such, all temporary on-site
conveyance channels shall be designed, constructed, and stabilized to prevent erosion from the
expected peak 10 minute velocity of flow from a Type 1A, 10-year, 24-hour recurrence interval
storm for the developed condition. Alternatively, the 10-year, 1-hour peak flow rate indicated by
an approved continuous runoff simulation model, increased by a factor of 1.6, shall be used.
Stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent
streambanks, slopes, and downstream reaches shall be provided at the outlets of all conveyance
systems.
3.2.3 Drainage Controls and Velocity Dissipation Devices
3-9
PulteGroup Inc., 2017 SWPPP 8/14/2019
Drainage control practices for the project should be implemented to divert flows from exposed
soils and/or prevent the development of rills and gullies on graded slopes. In order to accomplish
this velocity dissipation, devices should be placed at discharge locations and along the length of
any outfall channel (as necessary) to provide non-erosive flow velocity from a structure to a
water course. This will enable natural, physical and biological characteristics and functions to be
maintained and protected so that no significant changes in the hydrological regime of the
receiving water occur.
Element 3 described below provides guidance for implementing interim and permanent
stabilization practices and the BMP map located in Appendix A shows where stabilization
practices are expected to occur.
Element #3 – Control Flow Rates
In order to protect the properties and waterways downstream of the project site, stormwater
discharges from the site will be controlled. The specific BMPs for flow control that shall be used
on this project include:
Interceptor Dikes and Swales (BMP C200)
Check Dams (BMP C207)
Silt Fence (BMP C233
Temporary Sediment Pond (BMP C241)
Alternate flow control BMPs may be selected by the onsite inspector in the event the BMP(s)
listed above are deemed ineffective or inappropriate during construction to satisfy the
requirements set forth in the General Permit. To avoid potential erosion and sediment control
issues that may cause a violation(s) to the General Permit, the SSWR will promptly initiate the
implementation of one or more of the alternative BMPs after the first sign that existing BMPs are
ineffective or failing.
In general, discharge rates of stormwater from the site will be controlled where increases in
impervious area or soil compaction during construction could lead to downstream erosion, or
where necessary to meet local agency stormwater discharge requirements (e.g. discharge to
combined sewer systems).
3.2.4 Wind Erosion Controls
Please refer to Sections 3.2.1 and 3.2.2 for temporary and permanent erosion control and soil
stabilization measures for the project.
3.2.5 BMPs to Minimize Off-Site Tracking
BMPs shall be used to minimize the off-site vehicle tracking of sediment onto paved surfaces to
every extent possible.
3-10
PulteGroup Inc., 2017 SWPPP 8/14/2019
Element 2 described below provides guidance for implementing interim and permanent
stabilization practices and the BMP map located in Appendix A shows where stabilization
practices are expected to occur.
Element #2 – Establish Construction Access
Construction access or activities occurring on unpaved areas shall be minimized, yet where
necessary, access points shall be stabilized to minimized the tracking of sediment onto public
roads, and wheel washing, street sweeping, and street cleaning shall be employed to prevent
sediment from entering state waters. All wash wastewater shall be controlled on site. The
specific BMPs related to establishing construction access that will be sued on this project
include:
Stabilized Construction Entrance (BMP C105)
Construction Road/Parking Area stabilization (BMP C107)
Alternate construction access BMPs may be selected by the onsite inspector in the event the
BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the
requirements set forth in the General Permit. To avoid potential erosion and sediment control
issues that may cause a violation(s) to the General Permit, the SSWR will promptly initiate the
implementation of one or more of the alternative BMPs after the first sign that existing BMPs are
ineffective or failing.
3.2.6 Permanent Site Stabilization
Please refer to Sections 3.2.1 through 3.2.4 for permanent site/soil stabilization measures for the
project. Additionally, each lot will be landscaped with sod and mulch for permanent
stabilization. Roof drains will be tied into the storm system.
3.2.7 Protect LID BMPs
Element #13 – Protect Low Impact Development BMPs
When construction activities are completed within any area proposed to use permanent LID
BMPs, certain protection measures will be established and implemented. For the Forest Terrace
project, no permanent LID BMPs are proposed.
3-11
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.3. NON-STORM WATER MANAGEMENT.
A.Potential sources of non-storm water that may be combined with storm water discharges
associated with the project include:
1.Discharges from fire-fighting activities.
2.Fire hydrant system flushing.
3.Potable water, including uncontaminated water line flushing.
4.Pipeline hydrostatic test water.
5.Uncontaminated air conditioning or compressor condensate.
6.Uncontaminated ground water or spring water.
7.Uncontaminated excavation dewatering water (in accordance with section S9.D.10 of
the General Permit).
8.Uncontaminated discharges from foundation or footing drains.
9.Water used to control dust. Permittees must minimize the amount of dust control
water used.
10.Routine external building wash down that does not use detergents.
11.Landscape irrigation water.
B.The following discharges to waters of the State, including groundwater, are prohibited:
1.Concrete wastewater.
2.Wastewater from washout and clean-up of stucco, paint, form release oils, curing
compounds and other construction materials.
3.Process wastewater as defined by 40 Code of Federal Regulations (CFR) 122.1.
4.Slurry materials and waste from shaft drilling.
5.Fuels, oils, or other pollutants used in vehicle and equipment operation and
maintenance.
6.Soaps or solvents used in vehicle and equipment washing.
7.Wheel wash wastewater, unless discharged according to Section S9.D.9.d. of the
General Permit.
8.Discharges from dewatering activities, including discharges from dewatering of
trenches and excavations, unless managed according to Section S9.D.10 of the
General Permit.
Where contaminated non-storm water activities occur, the following section describe the
controls, including storage practices to minimize exposure of the materials to the storm water as
well as spill prevention and response practices.
3.3.1 Materials and Waste Management BMPs
Pollution prevention measures associated with the materials and waste management should be
used to control potential pollution sources.
Element 9 described below provides guidance for controlling pollutants.
Element #9 – Control Pollutants
3-12
PulteGroup Inc., 2017 SWPPP 8/14/2019
All pollutants, including waste materials and demolition debris, that occur onsite shall be
handled and disposed of in a manner that does not cause contamination of stormwater. Good
housekeeping and preventative measures will be taken to ensure that the site will be kept clean,
well-organized, and free of debris. If required, BMPs to be implemented to control specific
sources of pollutants are discussed below.
Vehicles, construction equipment, and/or petroleum product storage/dispensing:
All vehicles, equipment, and petroleum product storage/dispensing areas will be
inspected regularly to detect any leaks or spills, and to identify maintenance needs
to prevent leaks or spills.
On-site fueling tanks and petroleum product storage containers s hall include
secondary containment.
Spill prevention measures, such as drip pans, will be used when conducting
maintenance and repair of vehicles or equipment.
In order to perform emergency repairs on site, temporary plastic will be placed
beneath and, if raining, over the vehicles.
Contaminated surfaces shall be cleaned immediately following any discharge or
spill incident.
Chemical storage:
Any chemicals stored in the construction areas will conform to the appropriate source
control BMPs listed in Volume IV of the Ecology stormwater manual. In Western WA,
all chemicals shall have cover, containment, and protection provided on site, per BMP
C153 for Material Delivery, Storage and Containment in SWMMWW 2005.
Application of agricultural chemicals, including fertilizers and pesticides, shall be
conducted in a manner and at application rates that will not result in loss of chemical to
stormwater runoff. Manufacturers’ recommendations for application procedures and rates
shall be followed.
Excavation and tunneling spoils dewatering waste:
Dewatering BMPs and BMPs specific to the excavation and tunneling (including
handling of contaminated soils) are discussed under Element 10.
Demolition:
Dust released from demolished sidewalks, buildings, or structures will be controlled
using Dust Control measures (BMP C140).
Storm drain inlets vulnerable to stormwater discharge carrying dust, soil, or debris will be
protected using Storm Drain Inlet Protection (BMP C220 as described above for Element
7).
Process water and slurry resulting from sawcutting and surfacing operations will be prevented
from entering the waters of the State by implementing Sawcutting and Surfacing Pollution
Prevention measures (BMP C152).
Concrete and grout:
Process water and slurry resulting from concrete work will be prevented from entering
the waters of the State by implementing Concrete Handling measures (BMP C151).
3-13
PulteGroup Inc., 2017 SWPPP 8/14/2019
Concrete wash out areas shall not be allowed on bare dirt or allowed to drain to bare dirt
or the storm system. See the Pulte BMP in Appendix G.
Sanitary wastewater:
Portable sanitation facilities will be firmly secured, regularly maintained, and emptied
when necessary.
Solid Waste:
Solid waste will be stored in secure, clearly marked containers.
Other:
Other BMPs will be administered as necessary to address any additional pollutant sources
on site.
Facility does not require a Spill Prevention, Control, and Countermeasure (SPCC) Plan under
Federal Regulations of the Clean Water Act (CWA)
3.3.2 Paint and Paint Waste Management
Pollution prevention measures associated with paint and paint waste management shall be used
on the project. The following measures will be used onsite to reduce the potential of
contamination due to paint spills:
Train employees in the careful application of paints, finishes, and coatings to reduce
misuse and overspray. Use ground or drop cloths underneath outdoor painting.
Do not conduct spraying activities near open water.
Wipe up spills with rags and other absorbent materials immediately. Do not hose down
the area to a storm drain or receiving water or conveyance ditch receiving water.
Temporary storage areas shall be provided away from vehicular traffic, waterways, and
storm drains.
Paint will be stored in a covered area at all times when not in use.
No paint is to be stored directly on the ground.
SSWR will determine the site of the paint washout. Unless posted, paint washout will
occur offsite.
Please see Appendix G for additional BMPs relating to painting.
3.3.3 Sanitary Waste Management
Portable sanitary stations shall be installed on site for sanitary waste management. All stations
shall be located on a flat sturdy area located at least 8’ away from any curb storm flow line. If 8’
of clearance can’t be maintained, a secondary containment measure such as a straw waddle
should be implemented around the station. Sandbags shall be placed inside the stations to reduce
the potential to blow over.
3-14
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.3.4 Spill Prevention and Response
To avoid and manage spills, material storage areas shall be kept clean, organized, and equipped
with an ample supply of appropriate spill clean-up material (spill kit). The spill kit should
include at a minimum:
1-water resistant nylon bag
3-oil absorbent socks 3”x4’
2-oil absorbent socks 3”x10’
12-oil absorbent pads 17”x19”
1-pair splash resistant goggles
3-pair nitrile gloves
10-disposable bags with ties
Instructions
Spill kits will be located in areas with a high potential for spills and deployed in a manner that
allows rapid access and use by contractors. The kits will be inspected and inventoried each year
to confirm all required items are present. They also will be inventoried after each emergency
event and restocked as needed.
The WA Department of Ecology and representative County will be notified of any hazardous
spill that has potential to reach sanitary or storm sewers, ground water, or surface waters, in
accordance with local, state, and federal spill reporting requirements. Notification will include
the type of material spilled, the approximate amount of material, containment procedures
followed, an assessment of the potential for transport of the material to sewer, surface or ground
waters and any resource damage.
3.3.5 Concrete Materials and Concrete Waste Management
Pollution prevention measures associated with the concrete materials and concrete waste
management that should be used for this project are noted in Appendix G – Concrete Handling
(Pulte BMP). The SSWR will determine the location of concrete washout areas as needed
throughout the project. If the concrete washout area has been deconstructed, then all concrete
waste must be hauled offsite.
3.3.6 Paving Operations Management
Pollution prevention measures associated with paving operations management should be used are
defined in BMP C152 in Appendix G.
3.3.7 Management of Landscape Products
Pollution prevention measures associated with the management of landscape products (including
fertilizers and pesticides) that should be used are defined by “BMPs for Landscaping and
Lawn/Vegetation Management” in Appendix G.
3-15
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.3.8 Vehicle and Equipment Cleaning
Pollution prevention measures associated with vehicle and equipment cleaning that should be
used are defined by “BMPs for Washing and Stream Cleaning Vehicles/Equipment/Building
Structures” in Appendix G.
3.3.9 Vehicle and Equipment Fueling, Maintenance and Storage
Pollution prevention measures associated with vehicle and equipment fueling, maintenance and
storage that should be used are defined by “BMPs for Mobile Fueling of Vehicles and Heavy
Equipment”, “BMPs for Maintenance and Repair of Vehicles and Equipment”, and “BMPs for
Parking and Storage of Vehicles and Equipment” in Appendix G.
3.3.10 Dewatering and Ponded Water Management
Pollution prevention measures associated with dewatering and ponded water management should
be used to control potential pollution sources.
Element 10 described below provides guidance for controlling pollutants.
Element #10 – Control Dewatering
There will be no dewatering as part of this construction project. All dewatering water from open
cut excavation, tunneling, foundation work, trench or underground vaults shall be discharged
into a controlled conveyance system prior to discharge to a sediment trap or sediment pond.
Channels will be stabilized per Element #8. Clean, non-turbid dewatering water will not be
routed through stormwater sediment ponds, and will be discharged to systems tributary to the
receiving waters of the State in a manner that does not cause erosion, flooding, or a violation of
State water quality standards in the receiving water. Highly turbid dewatering water from soils
known or suspected to be contaminated, or from use of construction equipment, will require
additional monitoring and treatment as required for the specific pollutants based on the receiving
waters into which the discharge is occurring. Such monitoring is the responsibility of the
contractor.
However, the dewatering of soils known to be free of contamination will trigger BMPs to trap
sediment and reduce turbidity. At a minimum, geotextile fabric socks/bags/cells will be used to
filter this material. Other BMPs to be used for sediment trapping and turbidity reduction include
the following:
Concrete Handling (BMP C151)
Temporary Sediment Pond (BMP C241)
Construction Stormwater Chemical Treatment (BMP C250)
Construction Stormwater Filtration (BMP C251)
pH Control for High pH Water (BMP C253)
Use of a sedimentation bag, with outfall to a ditch or swale for small volumes of
localized dewatering.
3-16
PulteGroup Inc., 2017 SWPPP 8/14/2019
Alternative BMP not included in Ecology’s Stormwater Management Manual for
Western Washington or in the King County Surface Water Design Manual.
Alternate dewatering controls BMPs may be selected by the onsite inspector in the event the
BMP(s) listed above are deemed ineffective or inappropriate during construction to satisfy the
requirements set forth in the General Permit. To avoid potential erosion and sediment control
issues that may cause a violation(s) to the General Permit, the SSWR will promptly initiate the
implementation of one or more of the alternative BMPs after the first sign that existing BMPs are
ineffective or failing.
3-17
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.4. POST-CONSTRUCTION STORM WATER MANAGEMENT MEASURES.
A.In the developed condition, storm drainage will be directed to the stormwater detention,
wetland facility for water quality treatment and flow control before discharging to the
stream side swale.
B.Water quality for the basin will be provided by the stormwater wetland.
Please see Appendix H for a list of BMPs that will be used for the Post-Construction Storm
Water Management Measures.
3-18
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.5. COMPLIANCE WITH STATE AND LOCAL PLANS.
A.This SWPPP is compliant with all applicable federal, state, and local requirements for
soil erosion & sediment control and storm water management. The requirements are
detailed in the General Permit and the following manuals:
a.King County Surface Water Design Manual
b.Washington State Department of Ecology Stormwater Management Manual for
Western Washington (erosion control only)
3-19
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.6.OTHER.
4-1
PulteGroup Inc., 2017 SWPPP 8/14/2019
SECTION 4.0 MAINTENANCE, REPAIR, AND INSPECTION
4.1.MAINTENANCE.
A.All temporary and permanent erosion and sediment control BMPs shall be maintained
and repaired as needed to assure continued performance of their intended function.
Maintenance and repair shall be conducted in accordance with each particular BMP’s
specifications. Visual monitoring of the BMPs will be conducted at least once every
calendar week and within 24 hours of any rainfall event that causes a discharge from the
site. If the site becomes inactive and is temporarily stabilized, the inspection frequency
will be reduced to once every month.
All temporary erosion and sediment control BMPs shall be removed within 30 days after
the final site stabilization is achieved or after the temporary BMPs are no longer needed.
Trapped sediment shall be removed or stabilized onsite. Disturbed soil resulting from
removal of BMPs or vegetation shall be permanently stabilized.
B.The SSWR must examine stormwater visually for the presence of suspended sediment,
turbidity, discoloration, and oil sheen. The SSWR must evaluate the effectiveness BMPs
and determine if it is necessary to install, maintain, or repair BMPs to improve the quality
of stormwater discharges. Based on the results of the inspection, the SSWR must correct
the problems identified by:
1.Reviewing the SWPPP for compliance with the General Permit and making
appropriate revisions within 7 days of the inspection.
2.Immediately being the process of fully implementing and maintaining appropriate
source control and/or treatment BMPs as soon as possible, addressing the problems
no later than within 10 days of the inspection. If installation of necessary treatment
BMPs is not feasible within 10 days, Ecology may approve additional time when an
extension is requested by the Permittee within the initial 10-day response period.
3.Document BMP implementation and maintenance in the site log book.
C.See BMP reference sheets in Appendix G for details of BMP maintenance.
D.For every Action Item identified during a Site Inspection, the SSWR shall record the
following information:
1.A specific reference to the Action Item including the date of the Site Inspection;
2.A brief description of the Responsive Action taken; and
3.The date the Responsive Action was completed.
4-2
PulteGroup Inc., 2017 SWPPP 8/14/2019
4.2.STORM MAINTENANCE AND REPAIR.
A.Visual monitoring of BMPs shall be conducted within 24 hours of any rainfall event that
causes discharge from the site. For purposes of this condition, individual discharge
events that last more than one day do not require daily inspections. For example, if a
stormwater pond discharges continuously over the course of a week, only one inspection
is required that week.
B.See Section 4.1 for details of maintenance and repair requirements for any issues noted
during monitoring.
4-3
PulteGroup Inc., 2017 SWPPP 8/14/2019
4.3.INSPECTIONS.
A.Inspections must be performed at the following frequencies:
1.At least once every calendar week;
2.Within 24 hours after a storm event that causes discharge from the site;
3.Provided that the site is temporarily stabilized, inspection frequency can be reduced
to every 30 days with approval from Ecology.
B.The SSWR must summarize the results of each inspection in an inspection report or
checklist and enter the report/checklist into, or attach it to, the site log book. At a
minimum, each inspection report or checklist must include:
1.Inspection date and time.
2.Weather information, the general conditions during inspection and the approximate
amount of precipitation since the last inspection, and precipitation within the last 24
hours.
3.A summary or list of all implemented BMPs, including observations of all
erosion/sediment control structures or practices.
4.A description of the locations:
i.Of BMPs inspected.
ii.Of BMPs that need maintenance and why.
iii.Of BMPs that failed to operate as designed or intended, and
iv.Where additional or different BMPs are needed and why.
5.A description of stormwater discharged from the site. The SSWR must note the
presence of suspended sediment, turbidity, discoloration, and oil sheen, as applicable.
6.Any water quality monitoring performed during inspection.
7.General comments and notes, including a brief description of any BMP repairs,
maintenance or installations made following the inspection.
8.A summary report and a schedule of implementation of the remedial actions that the
SSWR plans to take if the site inspection indicates that the site is out of compliance.
The remedial actions taken must meet the requirements of this SWPPP and the
General Permit.
9.The name, title, and signature of the person conducting the site inspection, a phone
number or other reliable method to reach this person, and the following statement: “I
certify that this report is true, accurate, and complete to the best of my knowledge and
belief.”
C.Turbidity Sampling Requirements
1.Turbidity must be tested once every calendar week when stormwater discharges from
the site or enters any on-site surface waters of the state, such as a creek running
through the site.
i.Samples must be representative of the flows and characteristics of the discharge.
ii.Sampling is not required when there is no discharge during a calendar week.
iii.Sampling is no required outside of normal working hours or during unsafe
conditions.
iv.If unable to sample, provide a brief explanation in the monthly Discharge
Monitoring Report (DMR).
4-4
PulteGroup Inc., 2017 SWPPP 8/14/2019
2.Sampling is required at all points where stormwater associated with construction
activity is discharged offsite including where it enters any on-site surface waters of
the state. If an area is fully stabilized, SSWR may discontinue sampling.
3.The SSWR shall perform turbidity tests with a calibrated turbidity meter
(turbidimeter) either onsite or at an accredited lab. The SSWR must record the results
in the site log book in nephelometric turbidity units (NTU).
4.Turbidity Benchmark Values and Reporting Triggers:
i.The benchmark value for turbidity is 25 NTU or less.
ii.For turbidities between 26 and 249 NTU:
a)Review the SWPPP for compliance with the General Permit and make
appropriate revisions within 7 days of the date the discharge exceeded the
benchmark.
b)Immediately begin the process to fully implement and maintain
appropriate source control and/or treatment BMPs as soon as possible,
addressing the problems within 10 days of the date the discharge exceeded
the benchmark. If installation of necessary treatment BMPs is not feasible
within 10 days, Ecology may approve additional time when the Permittee
requests an extension within the initial 10-day response period.
c)Document BMP implementation and maintenance in the site log book.
iii.Turbidity 250 NTU or greater:
a)Telephone Ecology’s Environmental Report Tracking System at 425-649-
7000 within 24-hours
b)Review the SWPP for compliance with the General Permit and make
appropriate revisions within 7 days of the date the discharge exceeded the
benchmark.
c)Immediately begin the process to fully implement and maintain
appropriate source control and/or treatment BMPs as soon as possible,
addressing the problems within 10 days of the date the discharge exceeded
the benchmark. If installation of necessary treatment BMPs is not feasible
within 10 days, Ecology may approve additional time when the Permittee
requests an extension within the initial 10-day response period.
d)Document BMP implementation and maintenance in the site log book.
e)Continue sampling daily until:
a.Turbidity is 25 NTU or lower,
b.Turbidity is no more than 5 NTU over background turbidity, if
background turbidity is less than 50 NTU,
c.Turbidity is no more than 10% over background turbidity, if
background turbidity is greater than 50 NTU, or
d.The discharge stops or is eliminated.
D.pH Sampling Requirements
1.pH monitoring must begin when the first concrete is poured and exposed to
precipitation and continue weekly throughout and after the concrete pour and curing
period, until stormwater pH is in the range of 6.5 to 8.5.
2.During the pH monitoring period, the SSWR must obtain a representative sample of
stormwater and conduct pH analysis at least once per week.
4-5
PulteGroup Inc., 2017 SWPPP 8/14/2019
3.Sampling must be from the sediment trap/pond(s) or other locations that receive
stormwater runoff from the area of significant concrete work before stormwater
discharges to surface waters.
4.The benchmark for pH is 8.5. Anytime sampling indicates that pH is 8.5 or greater,
the SSWR must either:
i.Prevent the high pH waters (8.5 or above) from entering storm sewer systems or
surface waters; or
ii.If necessary, adjust or neutralize the high pH water until it is in the range of pH
6.5 to 8.5 using an appropriate treatment BMP such as carbon dioxide (CO2)
sparging or dry ice. Ecology must approve of any form of chemical treatment
other than CO2 sparging or dry ice.
5.pH analysis must be performed using a calibrated pH meter, pH test kit, or wide rage
pH indicator paper. The SSWR must record pH monitoring results in the site log
book.
E.Discharge Monitoring Reports
1.Discharge Monitoring Reports (DMR) must be submitted to Ecology on a monthly
basis. The forms must be received within 15 days following the end of each month.
2.DMRs must be submitted using Ecology’s WebDMR system, located at
http://www.ecy.wa.gov/programs/wq/permits/paris/webdmr.html.
3.If there was no discharge during a given monitoring period, a DMR must still be
submitted with “no discharge” entered in place of the monitoring results.
4-6
PulteGroup Inc., 2017 SWPPP 8/14/2019
4.4.OTHER.
5-1
PulteGroup Inc., 2017 SWPPP 8/14/2019
SECTION 5.0 TRAINING
The Pulte Storm Water Training Program includes: Storm Water Awareness Training, Storm
Water Manager Training; and Annual Division Refresher Training. Training may be live or
provided through electronic media. Every instructor presenting the Pulte Storm Water Training
Program should be either a Storm Water Consultant or a Storm Water Trained Pulte employee.
A brief description of the training categories is as follows:
1.Storm Water Awareness Training: For Pulte employees who will not directly manage
trades or sub-contractors that could affect storm water compliance.
2.Storm Water Manager Training: Otherwise known as “Initial Training”, for those Pulte
employees who will manage trades and/or storm water compliance.
3.Annual Division Refresher Training: For all field personnel in the Division, to review
permit requirements, potential storm water issues, and BMPs.
While initial training is designed as a one-time event, a Pulte employee may be required to repeat
the initial training if they allow more than 24 months to elapse without participating in a Division
Training.
CESCL Training
All SSWRs must obtain and maintain CESCL certification through an approved erosion and
sediment control training program that meets the minimum training standards establish by
Ecology.
6-1
PulteGroup Inc., 2017 SWPPP 8/14/2019
SECTION 6.0 TRADE CONTRACTOR COMPLIANCE
Storm Water Orientation Program
Prior to each Listed Contractor (include or reference list) or Storm Water Consultant beginning
work for Pulte, the following information should be provided either by posting on an internet site
or alternative means of delivery:
an overview of Pulte’s storm water program;
information explaining how to contact a Site Storm Water Representative; and,
a description of the potential consequences for failure to comply with Storm Water
Requirements.
Before construction activity begins, a sign should be erected at a conspicuous location at the Site,
such as the Site entrance or exit. The sign should include the following information:
identification and contact information for the Site Storm Water Representative(s);
Pulte’s compliance expectations;
how to obtain additional storm water compliance information; and,
the potential consequences of non-compliance.
This information may be provided to Listed Contractors or Storm Water Consultants by an
alternative means of delivery.
Contractor and Storm Water Consultant Compliance
The applicable Pulte “Trade Sheets” should be provided to each Listed Contractor or Storm
Water Consultant prior to their commencement of work for Pulte. The Trade Sheets should be
provided either by posting on an internet site or other means of delivery.
Pulte requires that Listed Contractors and Storm Water Consultants:
(i)comply with the Applicable Permit and with instructions by Pulte's Storm Water Compliance
Representatives to comply with Storm Water Requirements;
(ii)circulate the Pulte Trade Sheets to their employees and sub-contractors who will be working
at the Site;
(iii)designate a Contractor Representative or Storm Water Consultant Representative,
respectively, with the authority to oversee, instruct, and direct their respective employees and
subcontractors at a Site regarding compliance with Storm Water Requirements;
(iv)contact Pulte Site Storm Water Representative(s) to obtain any additional storm water
compliance information;
(v)where storm water compliance information is provided through an internet site (provided by
Pulte), the Listed Contractor Representative or Storm Water Consultant Representative
should review the posted information; and,
6-2
PulteGroup Inc., 2017 SWPPP 8/14/2019
(vi) be informed of the consequences for failure to comply with the Applicable Permit (i.e.,
through master contracts).
6-3
PulteGroup Inc., 2017 SWPPP 8/14/2019
Appendices
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
A-1
APPENDIX A VICINITY MAP, SITE MAP, BMP MAP.
Include plans and/or maps that are required per Applicable Permit and that depict the items
described in Section 2.1, etc.
P
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLATPULTE GROUP, INC3535 FACTORIA BLVD S.E., #600BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000813/11/2020
FOREST TERRACE PLAT
·
·
SCALE: 1"=50'
R-404806
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLATPULTE GROUP, INC3535 FACTORIA BLVD S.E., #600BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000813/11/2020
FOREST TERRACE PLAT
”
R-404807
IN COMPLIANCE WITH CITY OF RENTON STANDARDSTED-40-4048FOREST TERRACE PLATPULTE GROUP, INC3535 FACTORIA BLVD S.E., #600BELLEVUE, WA 98006FOREST TERRACE PLATLUA: 18-000124C: 18-006619FOREST TERRACE PLATPR: 18-0000813/11/2020
FOREST TERRACE PLAT
R-404808
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
B-1
APPENDIX B CONSTRUCTION GENERAL PERMIT AND BLANK FORMS.
Include a copy of the following:
Applicable Permit
Blank forms (with instructions)
– NOI
– NOT
– Other applicable forms (Non-Compliance Reporting, etc.)
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
B-2
Insert Applicable Permit here
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
B-4
Insert blank NOT with instructions here
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
C-1
APPENDIX C SWPPP AMENDMENT LOG.
Record amendments to the SWPPP. The table on the following page is recommended to keep
an accurate record as described in Section 1.6. Directions for completing each column of the
table follow:
Amendment No.: Assign each amendment a consecutive log-in number to keep an accurate
record of SWPPP amendments (e.g., 1, 2, 3, etc.).
Summary of Amendment or Revision: Briefly describe the SWPPP amendment or revision.
Date of Revision: Record the date that the SWPPP was modified/updated.
Preparer Name/Title: Record the name and title of the person who amended the SWPPP.
Approved by Pulte: Each amendment entry in the table should be signed/approved by the
appropriate SSWR. Sign or initial in the appropriate box.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP InstructionsC-2
Table C1: Summary of SWPPP Amendments or Revisions
Amendment
No.
Summary of Amendment or Revision Date of
Revision
Preparer Name/Title Approved by Pulte
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
D-1
APPENDIX D DOCUMENTATION OF PERMIT ELIGIBILITY RELATED TO TOTAL MAXIMUM
DAILY LOADS.
As required by the Applicable Permit, include documentation supporting a determination of
permit eligibility with regard to waters that have an EPA-established or approved Total
Maximum Daily Load (TMDL).
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
E-1
A.Include a proposed construction schedule (if not included in Section 2.2).
B.As required by the Applicable Permit, record important dates (see Table E1).
For example, record when:
1)major grading activities occur;
2)construction activities temporarily or permanently cease on a portion of the Site; and,
3)stabilization measures are initiated.
Specify where these dates are recorded, if not recorded in this Appendix (e.g., on BMP
Reference maps in Appendix A).
C.Revise and complete Table E1 so that it lists Site-specific construction activity milestones
(recommended). Table E1 is provided as a sample and should be revised accordingly to
meet the requirements of the Applicable Permit and the project. Add or delete rows as
necessary.
APPENDIX E CONSTRUCTION SCHEDULE.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
E-2
Construction Activity Milestones
Section I: Pre-Site Disturbance Checklist
(Provide information below as tasks are completed)Completed Initials
Has a Master Site List ID Number been obtained? If so, list number below.
MSL ID = ☒
Has a SWPPP been prepared in accordance with the Pulte Format (Table of Contents)
and Applicable Permit (e.g., CGP or Individual Permit)?☒
Has one primary SSWR with current Pulte Storm Water Manager Training and
State/Local Certification (if required) been assigned to the Site?☐
If a Third-Party Consultant will be completing Site Inspections…Has the Third-Party
Consultant met the State/Local Inspector Certification requirement (if required)? If not
applicable…please indicate at the column to the right.☐
Provide “actual” dates below. Do NOT provide estimated
dates based on forecasted schedule.Start Date Completion
Date
Date Notice of Intent (NOI) was submitted to the permitting authority
Effective date of permit coverage (This date must be consistent with the Site-specific
effective date included in the acknowledgement letter/Notice of Coverage letter from
the permitting authority, if applicable)
Installation of initial Erosion and Sediment Control BMPs per Applicable Permit/Local
requirements (e.g., CGP)
1.Perimeter Silt Fence
2.Stabilized Construction Entrances
3.Other:
4.Other:
5.Other:
6.Other:
UPON COMPLETION OF SECTION I, FORWARD A COPY TO THE DCE.
DO NOT COMMENCE SITE DISTURBANCE UNTIL THIS TABLE HAS BEEN RECEIVED/REVIEWED.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
E-3
Section II: Site Disturbance Activities
1.If Site Disturbance Activities were completed “by others” (e.g., Pulte is
purchasing Finished Lots), indicate that in the columns to the right.
2.As applicable, complete a separate Section II (Site disturbance activities table)
for each phase, section, pod, etc. indicate phase, section, pod below:
Phase, Section, Pod =
Start Date Completion
Date
Clearing and Grubbing
Demolition
Mass Grading – see BMP Map for installation dates of storm water management
facilities
Installation of “Wet” and/or “Dry” Utilities:
1.
2.
3.
4.
5.
Dates and Locations when Land Development/Construction Activities Temporarily
Cease:
1.
2.
3.
4.
Paving Activities
Vertical Construction
Final Stabilization:
1.
2.
3.
Landscaping
Date Notice of Termination (NOT) was submitted to the permitting authority
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
E-4
Sample table follows:
Table E2: Construction Activities & Phased Associated BMPs
Construction Activity Associated BMPs for Phase of Construction1
Surveying & Soils Testing Stabilized Entrances and Exits
Training/Orientation
Demolition & Vegetation Removal (Clearing &
Grubbing)
Preservation of Existing Vegetation / Buffer Strips
Perimeter Control
Stabilized Entrances and Exits
Inlet Protection
Training/Orientation
BMP Inventory on Site
Material Use
Waste Management
Sanitary Waste Management
Spill Prevention & Control Procedures
Vehicle & Equipment Cleaning
Vehicle & Equipment Fueling and Maintenance
Rough Grading & Finish Grade
Storm Drain Improvements
Sewer and Water Improvements
Dry Utilities
Street Improvements
Perimeter Walls
Silt Fence
Sediment Traps/Basins
Check Dams
Stabilized Entrances and Exits
Topsoiling
Surface Roughening
Hydraulic Mulch
Hydraulic Matrix
Bonded Fiber Matrix
Soil Binders
Straw Mulch
Wood Mulch
Erosion Control Blankets (Rolled Erosion Control Products)
Vehicle & Equipment Cleaning
Vehicle & Equipment Fueling and Maintenance
Sanitary Waste Management
Contaminated Soils Management
Dewatering & Ponded Water Management
Spill Prevention & Control Procedures
Training/Orientation
Material Use
Waste Management
1 BMP implementation should follow the proposed construction schedule.
D.Revise and complete Table E2 so that it lists Site-specific construction activities and
associated BMPs for the appropriate phase of construction (recommended). Table E2 is
provided as a sample and should be revised accordingly to meet the requirements of the
Applicable Permit and the project. Add or delete rows as necessary.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
E-5
Table E2: Construction Activities & Phased Associated BMPs (cont.)
Construction Activity Associated BMPs for Phase of Construction1
Vertical Construction Including…
Retaining Perimeter Walls
Foundation Work
Carpentry and Framing
HVAC
Electrical and Digital Wiring
Plumbing
Insulation
Drywall
Masonry
Roofing
Lath, Plaster, and Stucco
Painting
Silt Fence
Check Dams
Fiber Rolls
Gravel Bag Berms
Sand Bag Barrier
Straw Bale Barriers
Storm Drain Inlet Protection
Tracking Control
Tire Wash
Permanent Site Stabilization
Waste Management
Concrete Management
Paving Operations Management
Management of Landscaping Products
Perimeter Control
Training/Orientation
BMP Inventory on Site
Sanitary Waste Management
Contaminated Soils Management
Dewatering & Ponded Water Management
Material Delivery & Storage Controls
Material Use
Spill Prevention & Control Procedures
Vehicle & Equipment Cleaning
Vehicle & Equipment Fueling and Maintenance
Turn-Over to HOA or Municipality Preservation of Existing Vegetation / Buffer Strips
Perimeter Control
Inlet Protection
BMP Inventory on Site
Line Items in Master Budget for Erosion and Sediment BMPs
Inform of Storm Water Obligations
Educational Brochures
1 BMP implementation should follow the proposed construction schedule.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP Instructions
E-6
Sample table follows:
Table E3: Soil Protection Schedule
Stabilization
Type JAN FEB MAR APR MAY JUNE JULY AUG SEPT OCT NOV DEC
Permanent
Seeding
A A
Dormant
Seeding
B B
Temporary
Seeding
B
Erosion Blanket B B
A – Specify applicable permanent seed mix XX LBS/ACRE
B – Specify applicable cover crop XX LBS/ACRE
E.Per the requirements of the Applicable Permit, provide a soil protection schedule. Revise
Table E3 as necessary to meet the conditions of the Site and the Applicable Permit (add or
delete rows as necessary).
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
© Pulte Homes, Inc., 2008 SWPPP InstructionsF-1
APPENDIX F CONSTRUCTION ACTIVITIES AND ASSOCIATED POLLUTANTS.
List construction activities and associated pollutants. Following are sample tables that can be
modified as necessary to meet the needs of the project and the requirements of the Applicable
Permit; add or delete rows as necessary.
The following tables list…
A.Table F1: Construction types with associated work activities and/or products that have the
potential to contribute to storm water pollution. Only include construction types and work
activities associated with the project.
B.Table F2: General work activities and/or products (only include those associated with the
project) that have the potential to pollute storm water, including:
1)Specific construction Site work activities and/or products associated with the general
work activities/products (from Table F1) that have the potential to pollute storm water
2)Physical description of potential pollutants (e.g., visible indicator), obtained from
Material Safety Data Sheets (MSDS) when available, associated with the general work
activities/products
3)Non-visible potential pollutant(s), obtained from MSDS when available, associated with
the general work activities/products.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
F-2
© Pulte Homes, Inc., 2008 SWPPP Instructions
Sample tables follow:
Table F1: Construction Types & Work Activities
Construction Type
(check types that apply –
delete those that do not)
Associated Work Activity/Products with Potential
to Contribute to Storm Water Pollution1
(check applicable activity/product – delete those that do not apply)
Demolition Grading/Earthwork (includes
disturbance of contaminated soil)
HVAC (removal)
Insulation (removal)
Planting/Vegetation Management
(removal)
Removal of Existing Structures and
Infrastructure
Sanitary Waste
Solid Waste
Vehicle and Equipment Use
Grading / Utility
Installation (trenching
and pipe laying)
Adhesives
Grading/Earthwork
Planting/Vegetation Management
(removal)
Sanitary Waste
Solid Waste
Utility Line Testing and Flushing
Vehicle and Equipment Use
Paving (streets, curbs,
sidewalks)
Asphalt (paving/curbs)
Grading/Earthwork (finish)
Liquid Waste (equipment rinsing;
street cleaning)
Concrete/Masonry (paving/curbs)
Painting (street striping)
Sanitary Waste
Solid Waste
Vehicle and Equipment Use
Structure
Construction
(residential,
commercial, or
industrial
development)
Adhesives
Cleaners
Concrete/Masonry
Drywall
Earthwork (for foundations)
Framing/Carpentry
HVAC
Insulation
Liquid Waste
Painting
Plumbing
Pools/Fountains
Roofing
Sanitary Waste
Solid Waste
Vehicle and Equipment Use
Landscaping Adhesives
Liquid Waste
Planting/Vegetation Management
(pesticides/herbicides)
Sanitary Waste
Soil Preparation (use of soil
additives/amendments)
Solid Waste (includes vegetation)
Vehicle and Equipment Use
1 Refer to Column 1, Table F2: Construction Site Work Activities & Associated Pollutants
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
F-3
© Pulte Homes, Inc., 2008 SWPPP Instructions
Table F2: Construction Site Work Activities & Associated Potential Pollutants
General Work Activity/
Products with Potential
Storm Water Pollutants
(check applicable
activity/product – delete
those that do not apply)
Specific Work Activity/Products
with Potential
Storm Water Pollutants
(check applicable activity/product
– delete those that do not apply)
Associated Visible
Indicator
(delete those that do
not apply and add
others as necessary)
Associated Non-
Visible
Potential Pollutants
(delete those that do
not apply and add
others as necessary)
Adhesives Adhesives, glues, resins, epoxy
synthetics, PVC cement
Caulks, sealers, putty, sealing
agents and
Coal tars (naphtha, pitch)
Oil sheen or other
discoloration from some
products
Phenolics, formaldehydes,
asbestos, benzene, phenols
and naphthalene
Asphalt (paving/curbs)Hot and cold mix asphalt Oil sheen Oil, petroleum distillates
Cleaners Polishes (metal, ceramic, tile)
Etching agents
Cleaners, ammonia, lye, caustic
sodas, bleaching agents and
chromate salts
Discoloration/plume
from some products
Metals, acidity/alkalinity,
chromium
Concrete/Masonry Cement and brick dust
Colored chalks
Concrete curing compounds
Glazing compounds
Surface cleaners
Saw cut slurries
Tile cutting
Discoloration/plume
from some products
Sediments, acidity, metals,
asbestos, particulates
Drywall Saw-cutting drywall Discoloration/plume
from drywall dust
Copper, aluminum,
sediments, minerals, and
asbestos
Framing/Carpentry Sawdust, particle board dust, and
treated woods
Saw cut slurries
Sawdust, slurry plume BOD, formaldehyde,
copper and creosote
Grading/Earthwork Blasting
Dewatering
Grading activities
Vegetation removal
Disturbance of contaminated soil
Sediment
discharge/plume, non-
storm water discharges,
vegetation debris
Soil amendments
(gypsum, lime), historic
soil contaminants
Heating, Ventilation, Air
Conditioning (HVAC)
Demolition or Construction of air
condition and heating systems
None Asbestos, Freon
Insulation Demolition or Construction
involving insulation, venting
systems
None Asbestos, aluminum, zinc
Liquid Waste Wash waters
Irrigation line testing/flushing
Non-storm water
discharges, detergents,
sediment, oily sheen,
concrete rinse or other
plume
See non-visible pollutants
listed in other categories
Painting Paint thinners, acetone, methyl
ethyl ketone, stripper paints,
lacquers, varnish, enamels,
turpentine, gum spirit, solvents,
dyes, stripping pigments and
sanding
Paint plume VOCs, metals, phenolics
and mineral spirits
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
F-4
© Pulte Homes, Inc., 2008 SWPPP Instructions
General Work Activity/
Products with Potential
Storm Water Pollutants
(check applicable
activity/product – delete
those that do not apply)
Specific Work Activity/Products
with Potential
Storm Water Pollutants
(check applicable activity/product
– delete those that do not apply)
Associated Visible
Indicator
(delete those that do
not apply and add
others as necessary)
Associated Non-
Visible
Potential Pollutants
(delete those that do
not apply and add
others as necessary)
Planting/Vegetation
Management
Vegetation control
(pesticides/herbicides)
Planting
Plant maintenance
Vegetation removal
Mulch, sediment,
vegetation
BOD, fertilizers,
pesticides, herbicides,
nutrients (nitrogen,
phosphorous, and
potassium) acidity/
alkalinity, metals,
aluminum sulfate, sulfur
Plumbing Solder (lead, tin), flux (zinc
chloride), pipe fitting
Galvanized metal in nails, fences,
and electric wiring
None Lead, copper, zinc and tin
Pools/Fountains Chlorinated water Non-storm water
discharges
Chlorine or other
disinfectant
Removal of Existing
Structures
Demolition of asphalt, concrete,
masonry, framing, roofing, metal
structures
Sediment, other
particulates
Toxics (paint strippers,
solvents, adhesives), trace
metals (galvanized metal,
painted surfaces,
preserved wood)
Roofing Flashing
Saw cut slurries (tile cutting)
Shingle scrap and debris
Debris, slurry plume Oil, petroleum distillates
Sanitary Waste Portable toilets
Disturbance of existing sewer
lines
Visible sanitary waste Bacteria, BOD, pathogens
Soil Preparation/
Amendments
Use of soil additives/amendments Mulch, sediment Soil amendments
Solid Waste Litter, trash and debris
Vegetation
Plastic, paper,
cigarettes, wood
products, steel,
vegetation waste, etc.
Utility Line Testing and
Flushing
Hydrostatic test water
Pipe flushing
Non-storm water
discharge, sediment
Chlorine
Vehicle and Equipment
Use
Equipment operation
Equipment maintenance
Equipment washing
Equipment fueling
Oil sheen, sediment Total petroleum
hydrocarbons, coolants,
benzene and derivatives
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
G-1
© Pulte Homes, Inc., 2008 SWPPP Instructions
APPENDIX G BMP REFERENCE SHEETS.
A.Attach BMP Reference Sheets that are consistent with the requirements of the Applicable
Permit.
B.Use Pulte BMP Fact Sheets or equivalent, if the Applicable Permit does not specify a
manual to use for obtaining appropriate reference sheets (or if reference sheets for specific
topics are not available).
C.Revise Pulte BMP Fact Sheets as necessary for consistency with the Applicable Permit.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
G-2
© Pulte Homes, Inc., 2008 SWPPP Instructions
Insert BMP Reference Sheets here
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
H-1
© Pulte Homes, Inc., 2008 SWPPP Instructions
APPENDIX H DESCRIPTION OF POST-CONSTRUCTION BMPS.
A.Describe all Post-Construction storm water management measures proposed for use on Site.
B.The following sample tables should be modified as necessary to meet the needs of the
project and the requirements of the Applicable Permit; add or delete BMPs as necessary
(recommended).
Please note that Post-Construction BMPs should be considered and incorporated into the project
design during preliminary and final engineering, and when obtaining the necessary permits and
approvals from Local, State, and Federal reviewing agencies.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
H-2
© Pulte Homes, Inc., 2008 SWPPP Instructions
Sample tables follow:
Table H1: Upfront Design Considerations for Post-Construction Site BMPs
Minimizing Impervious Areas
Reduce sidewalk widths or put sidewalks on one side of the street
Incorporate landscaped buffer areas between sidewalks and streets
Design residential streets for the minimum required pavement widths
Minimize the number of residential street cul-de-sacs and incorporate landscaped areas to reduce their
impervious cover
Use open space (Conservation Design) development that incorporates smaller lot sizes
Increase building density while decreasing the building footprint
Reduce overall lot imperviousness by promoting alternative driveway surfaces and shared driveways that
connect two or more homes together
Reduce overall imperviousness associated with parking lots by providing compact car spaces, minimizing
stall dimensions, incorporating efficient parking lanes, and using pervious materials in spillover parking
areas
Design concave medians instead of convex medians
Use curb cuts to divert low flow into vegetated areas
Use grassed swales in lieu of curbs and gutters
Increase Rainfall Infiltration
Use permeable materials for private sidewalks, driveways, parking lots, and interior roadway surfaces
(examples: hybrid lots, parking groves, permeable overflow parking, etc.)
Direct rooftop runoff to pervious areas such as yards, open channels, or vegetated areas, and avoid routing
rooftop runoff to the roadway or the urban runoff conveyance system
Maximize Rainfall Interception
Maximize canopy interception and water conservation by preserving existing native trees and shrubs, and
planting additional native or drought tolerant trees and large shrubs
Minimize Directly Connected Impervious Areas
Drain rooftops into adjacent landscaping prior to discharging to the storm drain
Drain parking lots into landscape areas co-designed as biofiltration areas
Drain roads, sidewalks, and impervious trails into adjacent landscaping
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
H-3
© Pulte Homes, Inc., 2008 SWPPP Instructions
Slope and Channel Protection
Use natural drainage systems to the maximum extent practicable
Stabilize permanent channel crossings
Plant native or drought tolerant vegetation on slopes
Install energy dissipaters, such as riprap, at the outlets of new storm drains, culverts, conduits, or channels
that enter unlined channels
Maximize Rainfall Interception
Store runoff in cisterns
Use foundation planting to intercept roof runoff
Increase Rainfall Infiltration
Direct roof or other drains to dry wells
Other
Other BMPs (describe)
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
H-4
© Pulte Homes, Inc., 2008 SWPPP Instructions
Table H2: Post-Construction Source Control BMPs
Storm drain system stenciling and/or signage
Outdoor material and trash storage area designed to reduce or control rainfall runoff
Landscaping BMPS: irrigation controls; integrated pest management program; use of drought resistant,
native plants; grouping of plants to optimize water use and natural pest control (select appropriate topics or
add others)
Street sweeping and catch basin cleaning
Other BMPs (describe)
Public Education
Training for homeowner association managers/commercial facility owners
Brochures/flyers on storm water pollution control
Good housekeeping practices (proper waste disposal, etc.)
Topics covered include: Hazardous waste collection; Landscape irrigation controls; Reduction of vehicle
use impacts; Storage and application of fertilizers, pesticides and other landscape management products
(select appropriate topics or add others)
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
H-5
© Pulte Homes, Inc., 2008 SWPPP Instructions
Table H3: Post-Construction Treatment Control BMPs
Biofilters
Grass swale
Grass strip
Wetland vegetation swale
Bio-retention
Dry Detention Basins
Extended/dry detention basin with grass lining
Extended/dry detention basin with impervious lining
Infiltration Basins
Infiltration basin
Infiltration trench
Porous asphalt
Porous concrete
Porous modular concrete block
Wet Ponds and Wetlands
Wet pond (permanent pool)
Constructed wetland
Drainage Inserts
Oil/water separator
Catch basin insert
Storm drain inserts
Catch basin screens
Filtration Systems
Media filtration
Sand filtration
Hydrodynamic Separation Systems
Swirl concentrator
Cyclone separator
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
I -1
© Pulte Homes, Inc., 2008 SWPPP Instructions
APPENDIX I RESPONSIBLE PARTIES AND CONTRACTORS.
A.Provide the information required by the Applicable Permit pertaining to
operators/responsible parties and/or contractors (use the attached tables as necessary).
B.Update information as appropriate.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
I -2
© Pulte Homes, Inc., 2008 SWPPP Instructions
Sample table follows:
Table I1: SWPPP Responsibilities
Name Company/Title Responsibility
Responsible for overall SWPPP implementation, compliance
with the Applicable Permit, and ensuring that field activities are
planned and conducted in accordance with the SWPPP
(including ensuring that materials and personnel are made
available for the successful implementation and maintenance of
all erosion and sediment control and other BMPs specified in
the SWPPP).
Responsible for documenting any amendments to the SWPPP in
Appendix C.
Responsible for annual compliance certification and reports to
the (insert appropriate agency) – as applicable.
Responsible for maintaining an up-to-date copy of this SWPPP
on Site at all times, from commencement of Construction to
final Site stabilization.
Responsible for providing a copy of the SWPPP for inspection
by outside authorized regulatory authorities upon request.
Responsible for documenting any changes in contractors and for
ensuring that all contractors involved with Construction
Activities, that may potentially affect storm water quality at the
Site, are made aware of, and their contracts reflect that they
should comply with the applicable provisions of this SWPPP.
Responsible for directing on-going regular BMP maintenance
activities (e.g., silt fence repair, fiber roll replacement, sediment
removal in sediment basin, timely waste disposal, etc.) and
implementing and overseeing necessary corrective actions to the
erosion/sediment control measures and other BMPs identified
during regular or storm-related Site Inspections.
Responsible for maintaining all Site records pertaining to
maintenance of erosion and sediment controls and other BMPs
as well as records detailing the dates on which major
Construction Activities began and were completed.
Designated Site contact for Government Inspections (by any
federal, state, and/or local agencies authorized to oversee
compliance with the Applicable Permit).
C.Complete the following table with name and title of person or persons responsible for each
described task (recommended). Complete for both Land Development and Vertical
Construction; specify accordingly. Add or delete rows as necessary to comply with the
Applicable Permit.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
I -3
© Pulte Homes, Inc., 2008 SWPPP Instructions
Sample table follows:
Table I2: Contractor List
Name/Title Company Name Trade/ Responsibilities Phone Number(s)1
1 Include: Daytime, Cellular/Pager, and Emergency Numbers
D.Per Applicable Permit, Trade Contractor Representative information should be provided in
this table. If Trade Contractors have not been selected at the time of SWPPP preparation,
the required information should be added to the SWPPP as it becomes available.
Instead of using Table I2, the necessary information could be provided on Contractor
Certification Statements, as allowed and as required by the Applicable Permit.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
I -4
© Pulte Homes, Inc., 2008 SWPPP Instructions
Insert signed Contractor Certification Statements here –
as required by the Applicable Permit
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
J-1
© Pulte Homes, Inc., 2008 SWPPP Instructions
APPENDIX J COMPLETED SITE INSPECTION REPORTS.
A.Include a blank SIR.
B.Include completed SIRs in this Appendix, or in a separate, clearly labeled binder (which is
maintained with the SWPPP). If completed SIRs are located in a separate binder that should
be noted here.
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
J-2
© Pulte Homes, Inc., 2008 SWPPP Instructions
Insert Blank SIR here
CONFIDENTIAL BUSINESS INFORMATION - PROPRIETARY PULTE MATERIAL
K-1
© Pulte Homes, Inc., 2008 SWPPP Instructions
APPENDIX K OTHER.
Provide additional Appendices for “Other” topics required to be kept with the SWPPP by the
Applicable Permit.
6-1
PulteGroup Inc., 2017 SWPPP 8/14/2019
Forest Terrace SWPPP
Tab 7.0
18396.003.TIR.doc
7.0 OTHER PERMITS
The City of Renton will be the governing body for the storm drainage. A building permit and
grading permit will be required from the City of Renton for the development of the on-site
drainage and roadway facilities. Additional permit are listed below:
King County Right of Way Permit with Corresponding Technical Information Report
Seattle Public Utility Permit
Forest Practice Permit
BP Pipeline Crossing Permit
Building Permit for Keystone Retaining Walls
Building Permit for Rockery Retaining Walls
Building Permit for Detention Vault
NPDES Permit
Tab 8.0
18396.003.TIR.doc
8.0 ESC ANALYSIS AND DESIGN
A. Erosion and Sediment Control (ESC) Plan Analysis and Design
The Erosion Control plan included with the final engineering plans, prepared in accordance
with the 2017 Renton Surface Water Design Manual, and standard industry practices
throughout the construction process to limit the amount of sediment traveling into the
downstream systems.
BMPs that are proposed include a rocked construction entrance, silt fence where needed,
straw mulch for the areas that reach final grade in the lot areas, V-ditched with rock check
dams, sediment ponds, and hydroseeding.
The site sediment basin has more than 3 acres of ground disturbance, therefore temporary
sediment pond is an appropriate BMP for this project. Temporary sediment pond will be used
in combination with V-Ditches for surface water control, silt fence for perimeter protection,
and a stabilized construction entrance to reduce the amount of sediment transported onto
paved roads by vehicles or equipment. Sediment traps, sized for 2 acres, will be used when
need to accommodate construction sequencing.
The temporary sediment ponds were sized per the 2017 RSWD manual, see Figure 8.0.1 –
TESC Analysis for calculations.
B. Stormwater Pollution Prevention and Spill (SWPPS) Plan Design
A Stormwater Pollution Prevention and Spill Site Plan has been prepared for Forest Terrace
subdivision as a part of the final engineering plans. This is a site specific plan that outlines
the project scope of work and presents a comprehensive plan to prevent, respond to and
report spills or release to the environment. It also provides suggested locations for:
Equipment parking/maintenance areas
Chemical storage areas with secondary containment
Construction materials and construction waste storage areas
Truck wheel washout areas
This plan also provides general location of erosion control measures such as silt fencing,
sediment pond, construction entrance, and clearing limits.
The site is generally underlain by alluvial soils. A seasonally high groundwater table will be
present during the wet weather and early spring months.
Potential Spill Sources or Releases
Potential spill sources during construction will include materials and equipment brought on-
site. Potential spill sources include; fueling, lubricating oil, hydraulic oil, backhoes, bulldozers,
water trucks, support trucks, lighting units, pumps, and generators. Equipment staging and
maintenance areas for fueling, hazardous materials, and hazardous waste materials have
been designated on the SWPPS. Construction debris will be present during demolition of the
existing on-site buildings. No fuel tanks, gasoline, oils and hydraulic fuels will be stored on-
site.
18396.003.TIR.doc
Control Pollutants
Pollutants other than sediment will be controlled as part of the implemented SWPPS plan.
Maintenance and repair of heavy equipment and vehicles that may result in discharge or
spillage of pollutants to the ground or surface water runoff will be conducted using spill
prevention measures. Contaminated surfaces will be cleaned immediately following any
discharge or spill incident. Spills will be reported within 24 hours. Emergency repairs may be
performed on-site using temporary plastic placed beneath and, if raining, over the vehicle.
Concrete truck chutes and pumps shall be washed out only into formed areas awaiting
installation of concrete or asphalt. Unused concrete remaining in the truck and pump shall be
returned to the originating batch plant for recycling. Hand tools including, but not limited to,
screeds, shovels, rakes and trowels shall be washed off only into formed areas awaiting
installation of concrete or asphalt. When no formed areas are available, washwater and
leftover product shall be contained in a lined container or in a sump designed to receive the
materials. Contained concrete shall be disposed of in a manner that does not violate
groundwater or surface water quality standards. Recommended BMP’s include Concrete
Handling (BMP C151)
Spill Prevention and Containment
The following is a list of BMP’s that will be used for the project.
Store and maintain equipment in a designated area.
Reduce the amount of hazardous materials and waste by substituting non-hazardous
or less hazardous materials.
Use secondary containment (drain pan) to catch spills when removing or changing
fluids.
Use proper equipment (pumps, funnels) to transfer fluids
Keep spill kits readily accessible.
Check incoming vehicles for leaking oil and fluids.
Transfer used fluids and oil filters to waste or recycling drums.
Inspect equipment immediately, if necessary.
Implement a preventative maintenance schedule for equipment and vehicles.
Perform fueling in designated fueling area.
Do not “top-off” tanks
Use secondary containment (drain pan) to catch spills.
Keep spill kits readily accessible,
Inspect fueling areas routinely for leaks and spills.
18396.003.TIR.doc
Monitor pollution prevention BMP’s and maintain records/reports of all inspections
using the worksheets at the end of this section.
Spill Response
Response in the first 15 minutes is critical to minimize the impacts to human health and
the environment and to minimize property damage and cleanup costs. The contractor will
respond immediately to spills and regulated materials. Spill response equipment shall be
stored in spill response kits located in a clearly marked and accessible area. The
standard approach toward spill response will be as follows:
Stop operations.
Stop the source of the spill.
Use appropriate materials to absorb, berm, or cover the area to prevent further
contamination.
Notify the construction manager,
Determine the method of clean up required. All methods shall comply with the
state or local requirements to spill response.
Contact a cleanup response firm if necessary.
Contact Personnel
The designated personnel responsible for managing, implementing and maintaining this
SWPPS plan include:
Pulte Group, Inc – (425) 216-3428
CECL – TBD
Contractor –TBD
A SWPPP report has also been prepared following the Department of Ecology (Ecology)
format and will be kept on-site during all construction activities. The SWPPP report
includes a narrative discussion of construction BMP’s that will be implemented during
construction, based on the 13 required elements as defined by Ecology. The SWPPP
report also outlines inspection, monitoring, and reporting requirements to meet the
requirements of the NPDES permit.
18396.003.TIR.doc
See TESC plan and calculations presented below.
18396 - FOREST TERRACE Sediment Pond
BGK
Sediment Pond - Designed for the East Sediment Pond.
Peak flows per WWHM analysis:
Q2yr = 3.9600 cfs
Q10yr = 6.4100 cfs
Q100yr = 9.9200 cfs
Required Surface Area at top of riser pipe:
SA = (2) * (Q2yr)= (2) * (3.96) = 8250.00 sf
(0.00096)(0.00096)
Basic Sediment Pond Geometry:
- SA at top of riser (at elevation 370.10)
- Minimum 3.5' deep pond requirement is met (top of riser to bottom)
- Maximum 3:1 interior side slope requirement is met
- Maximum 2:1 exterior side slope requirement is met
- 1' freeboard requirement is met (top of riser to crest of emergency spillway)
- Flat bottom requirement is met
- 1' deep spillway requirement is met
- Meets L:W ratio between 3:1 to 6:1
Principal Spillway - Riser Pipe
Qdesign = (Q10yr) * (1.6)= 10.26 cfs
h = 1 foot
Riser Inflow Curve - see the following page.
Emergency Overflow Spillway Length (with 3:1 side slopes):
Qdesign = (Q100yr) * (1.6)= 15.87 cfs
H = 0.4 inches, 0.2 inches minimum
L = (Q100yr) - (2.4) * (H) = 9.92 - (2.4) * (0.4)
(3.21) * (H3/2)(3.21) * (0.43/2)
L = 11.26 feet, 6' minimum length
L = 11.25565202 feet
-
Dewatering Orifice Diameter:
h = 4 foot riser
Ao = =
Ao = 0.079 sf
D = (13.54) * (Ao
0.5)
D = (13.54) * (0.0790.5)= 3.81 inches, 1 inch minimum
D = 3.813481738 inches
- The perforated tubing connected to the dewatering orifice must be at least 2"
larger in diameter than the orifice.
Ponds with berms less than 2' in height on grades < 5% can use a Type 2 MH with a
birdcage. Armour the emergency overflow spillway with riprap.
(SA) * (2*h)0.5 (8,250) * (2*4)0.5
(0.6) * (3600) * (24) * (32.20.5) (0.6)*(3600)*(24)*(32.2
0.5)
Q100=9.92 CFS
BASIN - LOTS
TJS
StormFilter Basin - Sediment Trap
Peak flows per WWHM analysis:
Q2yr = 0.75 cfs
Required Surface Area at invert of weir:
SA = (2) * (Q2yr)= (2) * (0.37) = 1,562.50 sf
(0.00096)(0.00096)
Basic Sediment Trap Geometry:
- SA at top of weir (at elevation ----.00) = ----- sf
- Minimum 3.5' deep trap requirement is met (top of weir to bottom)
- Maximum 3:1 interior side slope requirement is met
- 1' freeboard requirement is met (top of weir to crest of overflow spillway)
- Flat bottom requirement is met
- Minimum 6' wide overflow spillway requirement is met
- 1' deep overflow spillway requirement is met
- Overflow spillway rip rap armorment requirement is met
Sediment Trap - 2 AC
Tab 9.0
18396.003.TIR.doc
9.0 BOND QUANTITIES AND FACILITY SUMMARIES
Figure 9.0.1 - BMP Covenant
Figure 9.0.2 – Stormwater Facility Summary Sheet
Page 1 of
3
Return Address:
City Clerk’s Office
City of Renton
1055 S Grady Way
Renton, WA 98057
DECLARATION OF COVENANT AND EASEMENT FOR INSPECTION
AND MAINTENANCE OF DRAINAGE FACILITIES AND ON-SITE BMPS
Grantor:
Grantee: City of Renton
Legal Description:
Assessor's Tax Parcel ID#:
IN CONSIDERATION of the approved City of Renton (check one of the following)
residential building permit, commercial building permit, clearing and grading permit,
subdivision permit, or short subdivision permit for application file No.
LUA/SWP_______________________ relating to the real property ("Property") described above, the
Grantor(s), the owner(s) in fee of that Property, hereby covenants(covenant) with the City of Renton, a
political subdivision of the state of Washington, that he/she(they) will observe, consent to, and abide by
the conditions and obligations set forth and described in Paragraphs 1 through 9 below with regard to the
Property, and hereby grants(grant) an easement as described in Paragraphs 2 and 3. Grantor(s) hereby
grants(grant), covenants(covenant), and agrees(agree) as follows:
1. The Grantor(s) or his/her(their) successors in interest and assigns ("Owners ") shall at their
own cost, operate, maintain, and keep in good repair, the Property's drainage facilities constructed as
required in the approved construction plans and specifications __________ on file with the City of
Renton and submitted to the City of Renton for the review and approval of permit(s)
_____________________________. The property's drainage facilities are shown and/or listed on Exhibit
A. The property’s drainage facilities shall be maintained in compliance with the operation and
maintenance schedule included and attached herein as Exhibit B. Drainage facilities include pipes,
channels, flow control facilities, water quality facilities, on-site best management practices (BMPs) and
other engineered structures designed to manage and/or treat stormwater on the Property. On-site BMPs
include dispersion and infiltration devices, bioretention, permeable pavements, rainwater harvesting
systems, tree retention credit, reduced impervious surface footprint, vegetated roofs and other measures
designed to mimic pre-developed hydrology and minimize stormwater runoff on the Property.
2. City of Renton shall have the right to ingress and egress over those portions of the Property
necessary to perform inspections of the stormwater facilities and BMPs and conduct maintenance
activities specified in this Declaration of Covenant and in accordance with the Renton Municipal Code.
City of Renton shall provide at least 30 days written notice to the Owners that entry on the Property is
x
Page 2 of
3
planned for the inspection of drainage facilities. After the 30 days, the Owners shall allow the City of
Renton to enter for the sole purpose of inspecting drainage facilities. In lieu of inspection by the City, the
Owners may elect to engage a licensed civil engineer registered in the state of Washington who has
expertise in drainage to inspect the drainage facilities and provide a written report describing their
condition. If the engineer option is chosen, the Owners shall provide written notice to the City of Renton
within fifteen days of receiving the City’s notice of inspection. Within 30 days of giving this notice, the
Owners, or engineer on behalf of the Owners, shall provide the engineer’s report to the City of Renton. If
the report is not provided in a timely manner as specified above, the City of Renton may inspect the
drainage facilities without further notice.
3. If City of Renton determines from its inspection, or from an engineer’s report provided in
accordance with Paragraph 2, that maintenance, repair, restoration, and/or mitigation work is required to
be done to any of the drainage facilities, City of Renton shall notify the Owners of the specific
maintenance, repair, restoration, and/or mitigation work (Work) required pursuant to the Renton
Municipal Code. The City shall also set a reasonable deadline for the Owners to complete the Work, or to
provide an engineer’s report that verifies completion of the Work. After the deadline has passed, the
Owners shall allow the City access to re-inspect the drainage facilities unless an engineer’s report has
been provided verifying completion of the Work. If the Work is not completed within the time frame set
by the City, the City may initiate an enforcement action and/or perform the required maintenance, repair,
restoration, and/or mitigation work and hereby is given access to the Property for such purposes. Written
notice will be sent to the Owners stating the City’s intention to perform such work. This work will not
commence until at least seven (7) days after such notice is mailed. If, within the sole discretion of the
City, there exists an imminent or present danger, the seven (7) day notice period will be waived and
maintenance and/or repair work will begin immediately.
4. The Owners shall assume all responsibility for the cost of any maintenance, repair work, or
any measures taken by the City to address conditions as described in Paragraph 3. Such responsibility
shall include reimbursement to the City within thirty (30) days of the receipt of the invoice for any such
work performed. Overdue payments will require payment of interest at the maximum legal rate allowed
by RCW 19.52.020 (currently twelve percent (12%)). If the City initiates legal action to enforce this
agreement, the prevailing party in such action is entitled to recover reasonable litigation costs and
attorney’s fees.
5. The Owners are required to obtain written approval from City of Renton prior to filling,
piping, cutting, or removing vegetation (except in routine landscape maintenance) in open vegetated
stormwater facilities (such as swales, channels, ditches, ponds, etc.), or performing any alterations or
modifications to the drainage facilities referenced in this Declaration of Covenant.
6. Any notice or consent required to be given or otherwise provided for by the provisions of this
Agreement shall be effective upon personal delivery, or three (3) days after mailing by Certified Mail,
return receipt requested.
7. With regard to the matters addressed herein, this agreement constitutes the entire agreement
between the parties, and supersedes all prior discussions, negotiations, and all agreements whatsoever
whether oral or written.
8. This Declaration of Covenant is intended to protect the value and desirability and promote
efficient and effective management of surface water drainage of the real property described above, and
shall inure to the benefit of all the citizens of the City of Renton and its successors and assigns. This
Page 3 of
3
Declaration of Covenant shall run with the land and be binding upon Grantor(s), and Grantor's(s')
successors in interest, and assigns.
9. This Declaration of Covenant may be terminated by execution of a written agreement by the
Owners and the City that is recorded by King County in its real property records.
IN WITNESS WHEREOF, this Declaration of Covenant for the Inspection and Maintenance of
Drainage Facilities is executed this _____ day of ____________________, 20_____.
GRANTOR, owner of the Property
GRANTOR, owner of the Property
STATE OF WASHINGTON )
COUNTY OF KING )ss.
On this day personally appeared before me:
, to me known to be the individual(s) described in
and who executed the within and foregoing instrument and acknowledged that they signed the same as
their free and voluntary act and deed, for the uses and purposes therein stated.
Given under my hand and official seal this _____ day of ____________________, 20_____.
Printed name
Notary Public in and for the State of Washington,
residing at
My appointment expires
EXHIBIT A – ON-SITE BMP SITE PLAN
TOTAL LOT/SITE AREA: 73,616 Sf. Ft/1.69 AC PERMIT #:
ADDRESS: 7519 NE Q Street, Renton, WA 98111 PARCEL NUMBER: 3322708
NEW/ REPLACED IMPERV. AREA (SF): 6,150 DISTURBED AREA (SF): 36,590
ON-SITE BMP(S) USED: Basic Dispersion (Splash Blocks, Gravel Filled Trenches, and Sheet Flow)
EXAMPLE
- OPERATIONS AND MAINTENANCE
LOT POLLUTION-GENERATING IMPERVIOUS SURFACE SHALL NOT EXCEED 4,000 SF
NO ADDITIONAL MAINTANACE REQUIRED.
KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL
2009 Surface Water Design Manual 1/9/2009 1
STORMWATER FACILITY SUMMARY SHEET DDES Permit
Number__________________
(provide one Stormwater Facility Summary Sheet per Natural Discharge Location)
Overview:
Project Name
_______________________________________________________Date___________________
Downstream Drainage Basins
Major Basin Name _____________________________
Immediate Basin Name __________________________
Flow Control:
Flow Control Facility Name/Number ________________________________
Facility
Location________________________________________________________________________
___
If none,
Flow control provided in regional/shared facility (give
location)___________________________________
No flow control required_____________ Exemption number
_______________________________
General Facility Information:
Type/Number of detention facilities: Type/Number of infiltration facilities:
______ ponds ______ ponds
______ vaults ______ tanks
______ tanks ______ trenches
Control Structure Location
_____________________________________________________________________
Type of Control Structure ______________________________ Number of Orifices/Restrictions
_____________
Size of Orifice/Restriction: No. 1 ________________
No. 2 ________________
No. 3 ________________
No. 4 ________________
Flow Control Performance Standard _________________________________
Forest Terrace 3/10/20
Lake Washington
Mays Creek
Tract A
N/A
N/A
N/A
1
Tract A (Inside Detention Vault)
Orifice Restrictor
2.031 in
2.125 in
Flow Control Duration Standard Matching Forested Site Conditions
16055-F-StormWATR Facility Summary-KC-2016-11-11
2.313 in
KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL
2009 Surface Water Design Manual 1/9/2009 2
Live Storage Volume __________________ Depth _______________ Volume Factor of Safety
________________
Number of Acres Served ____________________
Number of Lots ____________________
Dam Safety Regulations (Washington State Department of Ecology)
Reservoir Volume above natural grade ________________
Depth of Reservoir above natural grade _______________
Facility Summary Sheet Sketch
All detention, infiltration and water quality facilities must include a detailed sketch.
(11"x17" reduced size plan sheets may be used)
123,130 cf 11 ft
13.02 Acres
25
0 cf
0 ft
KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL
2009 Surface Water Design Manual 1/9/2009 3
Water Quality:
Type/Number of water quality facilities/BMPs:
______ biofiltration swale ______ sand filter (basic or large)
(regular/wet/ or continuous inflow) ______ sand filter, linear (basic or
large)
______ combined detention/wetpond ______ sand filter vault (basic or
large)
(wetpond portion basic or large) sand bed depth______ (inches)
______ combined detention/wetvault ______ stormwater wetland
______ filter strip ______ storm filter
______ flow dispersion ______ wetpond (basic or large)
______ farm management plan ______ wetvault
______ landscape management plan ______ Is facility Lined?
______ oil/water separator If so, what marker is used
above
(baffle or coalescing plate)
Liner?____________________
______ catch basin inserts:
Manufacturer____________________________________________
______ pre-settling pond
______ pre-settling structure:
Manufacturer__________________________________________
______ high flow bypass structure (e.g., flow-splitter catch basin)
______ source controls
_________________________________________________________
Design Information
Water Quality design flow ______________________________
Water Quality treated volume (sandfilter) ___________________
Water Quality storage volume (wetpool) ___________________
Facility Summary Sheet Sketch
1
0.35 cfs
KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL
2009 Surface Water Design Manual 1/9/2009 4
All detention, infiltration and water quality facilities must include a detailed sketch.
(11"x17" reduced size plan sheets may be used)
Tab 10.0
18396.003.TIR.doc
10.0 OPERATIONS AND MAINTENANCE MANUAL
Forest has a single Detention Vault and a Contech StormFilter vault located within Tract A of the
proposed plat. Maintenance of these facilities shall be the responsibility of the individual lot
owners within the project development. The onsite conveyance system consists of a series of
catch basins and storm pipes, which direct stormwater to the drainage facilities within Tract A.
Onsite Conveyance Systems within the right of way will be inspected and maintained by the City
of Renton. Onsite conveyance systems within the drainage easements or tracts will be
maintained by the property owners through the Homeowners' Association created by the
subdivision (with each property owner having equal responsibility for maintenance). These
conveyance elements include those entering and exiting the tract from/to the public right-of-way.
For conveyance pipes entering the tract from right-of-way, responsibility begins at the last
structure prior to entering the tract. For conveyance pipes exiting the tract to right-of-way,
responsibility ends at the next downstream structure. The easement shall grant the City rights for
inspection. Maintenance of the above listed stormwater facilities shall be conducted on an annual
basis. Please refer to the maintenance requirements within this section.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-6
NO. 3 – DETENTION TANKS AND VAULTS
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Site Trash and debris Any trash and debris which exceed 1 cubic foot per 1,000 square feet (this is about equal to the amount of trash it would take to fill up one standard size office garbage can). In general, there should be no visual evidence of dumping.
Trash and debris cleared from site.
Noxious weeds Any noxious or nuisance vegetation which may constitute a hazard to City personnel or the public.
Noxious and nuisance vegetation removed according to applicable regulations. No danger of noxious vegetation where City personnel or the public might normally be.
Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film.
Excessive growth of grass/groundcover Grass or groundcover exceeds 18 inches in height. Grass or groundcover mowed to a height no greater than 6 inches.
Tank or Vault Storage Area Trash and debris Any trash and debris accumulated in vault or tank (includes floatables and non-floatables).
No trash or debris in vault.
Sediment accumulation Accumulated sediment depth exceeds 10% of the diameter of the storage area for ½ length of storage vault or any point depth exceeds 15% of diameter. Example:
72-inch storage tank would require cleaning when sediment reaches depth of 7 inches for more than ½ length of tank.
All sediment removed from storage area.
Tank Structure Plugged air vent Any blockage of the vent. Tank or vault freely vents.
Tank bent out of shape Any part of tank/pipe is bent out of shape more than 10% of its design shape. Tank repaired or replaced to design.
Gaps between sections, damaged
joints or cracks or tears in wall
A gap wider than ½-inch at the joint of any tank sections or any evidence of soil
particles entering the tank at a joint or through a wall.
No water or soil entering tank through joints or walls.
Vault Structure Damage to wall, frame, bottom, and/or top slab
Cracks wider than ½-inch, any evidence of soil entering the structure through cracks or qualified inspection personnel determines that the vault is not structurally sound.
Vault is sealed and structurally sound.
Inlet/Outlet Pipes Sediment accumulation Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment.
Trash and debris Trash and debris accumulated in inlet/outlet pipes (includes floatables and non-floatables).
No trash or debris in pipes.
Damaged inlet/outlet pipes Cracks wider than ½-inch at the joint of the inlet/outlet pipes or any evidence of soil entering at the joints of the inlet/outlet pipes.
No cracks more than ¼-inch wide at the joint of the inlet/outlet pipe.
Access Manhole Cover/lid not in place Cover/lid is missing or only partially in place. Any open manhole requires immediate maintenance.
Manhole access covered.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-7
NO. 3 – DETENTION TANKS AND VAULTS
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Access Manhole (cont.) Locking mechanism not working Mechanism cannot be opened by one maintenance person with proper tools. Bolts cannot be seated. Self-locking cover/lid does not work.
Mechanism opens with proper tools.
Cover/lid difficult to remove One maintenance person cannot remove cover/lid after applying 80 lbs of lift. Cover/lid can be removed and reinstalled by one maintenance person.
Ladder rungs unsafe Missing rungs, misalignment, rust, or
cracks.
Ladder meets design standards. Allows
maintenance person safe access.
Large access
doors/plate
Damaged or difficult
to open
Large access doors or plates cannot be
opened/removed using normal equipment.
Replace or repair access door so it can
opened as designed.
Gaps, doesn't cover completely Large access doors not flat and/or access opening not completely covered. Doors close flat; covers access opening completely.
Lifting rings missing, rusted Lifting rings not capable of lifting weight of door or plate. Lifting rings sufficient to lift or remove door or plate.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-8
NO. 4 – CONTROL STRUCTURE/FLOW RESTRICTOR
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Structure Trash and debris Trash or debris of more than ½ cubic foot which is located immediately in front of the structure opening or is blocking capacity of the structure by more than 10%.
No Trash or debris blocking or potentially blocking entrance to structure.
Trash or debris in the structure that exceeds 1/3 the depth from the bottom of basin to invert the lowest pipe into or out of the basin.
No trash or debris in the structure.
Deposits of garbage exceeding 1 cubic foot in volume. No condition present which would attract or support the breeding of insects or rodents.
Sediment accumulation Sediment exceeds 60% of the depth from the bottom of the structure to the invert of the lowest pipe into or out of the structure or the bottom of the FROP-T section or is
within 6 inches of the invert of the lowest pipe into or out of the structure or the bottom of the FROP-T section.
Sump of structure contains no sediment.
Damage to frame and/or top slab Corner of frame extends more than ¾ inch past curb face into the street (If applicable).
Frame is even with curb.
Top slab has holes larger than 2 square inches or cracks wider than ¼ inch. Top slab is free of holes and cracks.
Frame not sitting flush on top slab, i.e., separation of more than ¾ inch of the frame from the top slab.
Frame is sitting flush on top slab.
Cracks in walls or bottom Cracks wider than ½ inch and longer than 3 feet, any evidence of soil particles entering structure through cracks, or maintenance person judges that structure is unsound.
Structure is sealed and structurally sound.
Cracks wider than ½ inch and longer than 1 foot at the joint of any inlet/outlet pipe or
any evidence of soil particles entering structure through cracks.
No cracks more than 1/4 inch wide at the joint of inlet/outlet pipe.
Settlement/ misalignment Structure has settled more than 1 inch or has rotated more than 2 inches out of alignment.
Basin replaced or repaired to design standards.
Damaged pipe joints Cracks wider than ½-inch at the joint of the inlet/outlet pipes or any evidence of soil entering the structure at the joint of the inlet/outlet pipes.
No cracks more than ¼-inch wide at the joint of inlet/outlet pipes.
Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film.
Ladder rungs missing or unsafe Ladder is unsafe due to missing rungs, misalignment, rust, cracks, or sharp edges. Ladder meets design standards and allows maintenance person safe access.
FROP-T Section Damaged FROP-T T section is not securely attached to
structure wall and outlet pipe structure should support at least 1,000 lbs of up or down pressure.
T section securely attached to wall and
outlet pipe.
Structure is not in upright position (allow up to 10% from plumb). Structure in correct position.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-9
NO. 4 – CONTROL STRUCTURE/FLOW RESTRICTOR
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
FROP-T Section (cont.) Damaged FROP-T (cont.) Connections to outlet pipe are not watertight or show signs of deteriorated grout.
Connections to outlet pipe are water tight; structure repaired or replaced and works as designed.
Any holes—other than designed holes—in
the structure.
Structure has no holes other than designed
holes.
Cleanout Gate Damaged or missing cleanout gate Cleanout gate is missing. Replace cleanout gate.
Cleanout gate is not watertight. Gate is watertight and works as designed.
Gate cannot be moved up and down by one maintenance person. Gate moves up and down easily and is watertight.
Chain/rod leading to gate is missing or damaged. Chain is in place and works as designed.
Orifice Plate Damaged or missing
orifice plate
Control device is not working properly due
to missing, out of place, or bent orifice plate.
Plate is in place and works as designed.
Obstructions to orifice plate Any trash, debris, sediment, or vegetation blocking the plate. Plate is free of all obstructions and works as designed.
Overflow Pipe Obstructions to
overflow pipe
Any trash or debris blocking (or having the
potential of blocking) the overflow pipe.
Pipe is free of all obstructions and works
as designed.
Deformed or damaged lip of overflow pipe
Lip of overflow pipe is bent or deformed. Overflow pipe does not allow overflow at an elevation lower than design
Inlet/Outlet Pipe Sediment accumulation Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment.
Trash and debris Trash and debris accumulated in
inlet/outlet pipes (includes floatables and non-floatables).
No trash or debris in pipes.
Damaged inlet/outlet
pipe
Cracks wider than ½-inch at the joint of the
inlet/outlet pipes or any evidence of soil entering at the joints of the inlet/outlet pipes.
No cracks more than ¼-inch wide at the
joint of the inlet/outlet pipe.
Metal Grates (If applicable) Unsafe grate opening Grate with opening wider than 7/8 inch. Grate opening meets design standards.
Trash and debris Trash and debris that is blocking more
than 20% of grate surface.
Grate free of trash and debris. footnote to
guidelines for disposal
Damaged or missing grate Grate missing or broken member(s) of the grate. Grate is in place and meets design standards.
Manhole Cover/Lid Cover/lid not in place Cover/lid is missing or only partially in place. Any open structure requires urgent maintenance.
Cover/lid protects opening to structure.
Locking mechanism
not working
Mechanism cannot be opened by one
maintenance person with proper tools. Bolts cannot be seated. Self-locking cover/lid does not work.
Mechanism opens with proper tools.
Cover/lid difficult to remove One maintenance person cannot remove cover/lid after applying 80 lbs. of lift. Cover/lid can be removed and reinstalled by one maintenance person.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-10
NO. 5 – CATCH BASINS AND MANHOLES
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Structure Sediment accumulation Sediment exceeds 60% of the depth from the bottom of the catch basin to the invert of the lowest pipe into or out of the catch basin or is within 6 inches of the invert of the lowest pipe into or out of the catch basin.
Sump of catch basin contains no sediment.
Trash and debris Trash or debris of more than ½ cubic foot which is located immediately in front of the catch basin opening or is blocking capacity of the catch basin by more than 10%.
No Trash or debris blocking or potentially blocking entrance to catch basin.
Trash or debris in the catch basin that exceeds 1/3 the depth from the bottom of basin to invert the lowest pipe into or out of the basin.
No trash or debris in the catch basin.
Dead animals or vegetation that could generate odors that could cause complaints or dangerous gases (e.g., methane).
No dead animals or vegetation present within catch basin.
Deposits of garbage exceeding 1 cubic foot in volume. No condition present which would attract or support the breeding of insects or rodents.
Damage to frame and/or top slab Corner of frame extends more than ¾ inch past curb face into the street (If applicable).
Frame is even with curb.
Top slab has holes larger than 2 square inches or cracks wider than ¼ inch. Top slab is free of holes and cracks.
Frame not sitting flush on top slab, i.e., separation of more than ¾ inch of the frame from the top slab.
Frame is sitting flush on top slab.
Cracks in walls or bottom Cracks wider than ½ inch and longer than 3 feet, any evidence of soil particles entering catch basin through cracks, or maintenance person judges that catch
basin is unsound.
Catch basin is sealed and is structurally sound.
Cracks wider than ½ inch and longer than 1 foot at the joint of any inlet/outlet pipe or any evidence of soil particles entering catch basin through cracks.
No cracks more than 1/4 inch wide at the joint of inlet/outlet pipe.
Settlement/ misalignment Catch basin has settled more than 1 inch or has rotated more than 2 inches out of alignment.
Basin replaced or repaired to design standards.
Damaged pipe joints Cracks wider than ½-inch at the joint of the inlet/outlet pipes or any evidence of soil entering the catch basin at the joint of the inlet/outlet pipes.
No cracks more than ¼-inch wide at the joint of inlet/outlet pipes.
Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film.
Inlet/Outlet Pipe Sediment accumulation Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment.
Trash and debris Trash and debris accumulated in
inlet/outlet pipes (includes floatables and non-floatables).
No trash or debris in pipes.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-11
NO. 5 – CATCH BASINS AND MANHOLES
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Inlet/Outlet Pipe (cont.) Damaged inlet/outlet pipe Cracks wider than ½-inch at the joint of the inlet/outlet pipes or any evidence of soil entering at the joints of the inlet/outlet pipes.
No cracks more than ¼-inch wide at the joint of the inlet/outlet pipe.
Metal Grates (Catch Basins) Unsafe grate opening Grate with opening wider than 7/8 inch. Grate opening meets design standards.
Trash and debris Trash and debris that is blocking more than 20% of grate surface. Grate free of trash and debris. footnote to guidelines for disposal
Damaged or missing grate Grate missing or broken member(s) of the grate. Any open structure requires urgent maintenance.
Grate is in place and meets design standards.
Manhole Cover/Lid Cover/lid not in place Cover/lid is missing or only partially in place. Any open structure requires urgent maintenance.
Cover/lid protects opening to structure.
Locking mechanism not working Mechanism cannot be opened by one maintenance person with proper tools. Bolts cannot be seated. Self-locking cover/lid does not work.
Mechanism opens with proper tools.
Cover/lid difficult to remove One maintenance person cannot remove cover/lid after applying 80 lbs. of lift. Cover/lid can be removed and reinstalled by one maintenance person.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-12
NO. 6 – CONVEYANCE PIPES AND DITCHES
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Pipes Sediment & debris accumulation Accumulated sediment or debris that exceeds 20% of the diameter of the pipe. Water flows freely through pipes.
Vegetation/root growth in pipe Vegetation/roots that reduce free movement of water through pipes. Water flows freely through pipes.
Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate.
No contaminants present other than a surface oil film.
Damage to protective coating or corrosion Protective coating is damaged; rust or corrosion is weakening the structural integrity of any part of pipe.
Pipe repaired or replaced.
Damaged pipes Any dent that decreases the cross section area of pipe by more than 20% or is determined to have weakened structural integrity of the pipe.
Pipe repaired or replaced.
Ditches Trash and debris Trash and debris exceeds 1 cubic foot per 1,000 square feet of ditch and slopes. Trash and debris cleared from ditches.
Sediment accumulation Accumulated sediment that exceeds 20% of the design depth. Ditch cleaned/flushed of all sediment and debris so that it matches design.
Noxious weeds Any noxious or nuisance vegetation which may constitute a hazard to City personnel or the public.
Noxious and nuisance vegetation removed according to applicable regulations. No danger of noxious vegetation where City personnel or the public might normally be.
Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film.
Excessive vegetation growth Vegetation that reduces free movement of water through ditches. Water flows freely through ditches.
Erosion damage to
slopes
Any erosion observed on a ditch slope. Slopes are not eroding.
Rock lining out of place or missing (If applicable)
One layer or less of rock exists above native soil area 5 square feet or more, any exposed native soil.
Replace rocks to design standards.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-13
NO. 7 – DEBRIS BARRIERS (E.G., TRASH RACKS)
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED.
Site Trash and debris Trash or debris plugging more than 20% of the area of the barrier. Barrier clear to receive capacity flow.
Sediment accumulation Sediment accumulation of greater than 20% of the area of the barrier Barrier clear to receive capacity flow.
Structure Cracked, broken, or loose pipe or structure Structure which bars attached to is damaged – pipe is loose or cracked or concrete structure is cracked, broken, or
loose.
Structure barrier attached to is sound.
Bars Incorrect bar spacing Bar spacing exceeds 6 inches. Bars have at most 6 inches spacing.
Damaged or missing bars Bars are bent out of shape more than 3 inches. Bars in place with no bends more than ¾ inch.
Bars are missing or entire barrier missing. Bars in place according to design.
Bars are loose and rust is causing 50% deterioration to any part of barrier. Repair or replace barrier to design standards.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-14
NO. 8 – ENERGY DISSIPATERS
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED.
Site Trash and debris Trash and/or debris accumulation. Dissipater clear of trash and/or debris.
Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate.
No contaminants present other than a surface oil film.
Rock Pad Missing or moved
rock
Only one layer of rock exists above native
soil in area five square feet or larger or any exposure of native soil.
Rock pad prevents erosion.
Dispersion Trench Pipe plugged with sediment Accumulated sediment that exceeds 20% of the design depth. Pipe cleaned/flushed so that it matches design.
Not discharging water
properly
Visual evidence of water discharging at
concentrated points along trench (normal condition is a “sheet flow” of water along trench).
Water discharges from feature by sheet
flow.
Perforations plugged Over 1/4 of perforations in pipe are plugged with debris or sediment. Perforations freely discharge flow.
Water flows out top of “distributor” catch basin.
Water flows out of distributor catch basin during any storm less than the design storm.
No flow discharges from distributor catch basin.
Receiving area over-saturated Water in receiving area is causing or has potential of causing landslide problems. No danger of landslides.
Gabions Damaged mesh Mesh of gabion broken, twisted or deformed so structure is weakened or rock may fall out.
Mesh is intact, no rock missing.
Corroded mesh Gabion mesh shows corrosion through more than ¼ of its gage. All gabion mesh capable of containing rock and retaining designed form.
Collapsed or deformed baskets Gabion basket shape deformed due to any cause. All gabion baskets intact, structure stands as designed.
Missing rock Any rock missing that could cause gabion to loose structural integrity. No rock missing.
Manhole/Chamber Worn or damaged post, baffles or side of chamber
Structure dissipating flow deteriorates to ½ or original size or any concentrated worn spot exceeding one square foot which would make structure unsound.
Structure is in no danger of failing.
Damage to wall, frame, bottom, and/or top slab
Cracks wider than ½-inch or any evidence of soil entering the structure through cracks, or maintenance inspection personnel determines that the structure is not structurally sound.
Manhole/chamber is sealed and structurally sound.
Damaged pipe joints Cracks wider than ½-inch at the joint of the inlet/outlet pipes or any evidence of soil entering the structure at the joint of the inlet/outlet pipes.
No soil or water enters and no water discharges at the joint of inlet/outlet pipes.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-15
NO. 9 – FENCING
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Site Erosion or holes under fence Erosion or holes more than 4 inches high and 12-18 inches wide permitting access through an opening under a fence.
No access under the fence.
Wood Posts, Boards
and Cross Members
Missing or damaged
parts
Missing or broken boards, post out of
plumb by more than 6 inches or cross members broken
No gaps on fence due to missing or broken
boards, post plumb to within 1½ inches, cross members sound.
Weakened by rotting
or insects
Any part showing structural deterioration
due to rotting or insect damage
All parts of fence are structurally sound.
Damaged or failed
post foundation
Concrete or metal attachments
deteriorated or unable to support posts.
Post foundation capable of supporting
posts even in strong wind.
Metal Posts, Rails and Fabric Damaged parts Post out of plumb more than 6 inches. Post plumb to within 1½ inches.
Top rails bent more than 6 inches. Top rail free of bends greater than 1 inch.
Any part of fence (including post, top rails, and fabric) more than 1 foot out of design alignment.
Fence is aligned and meets design standards.
Missing or loose tension wire. Tension wire in place and holding fabric.
Deteriorated paint or protective coating Part or parts that have a rusting or scaling condition that has affected structural adequacy.
Structurally adequate posts or parts with a uniform protective coating.
Openings in fabric Openings in fabric are such that an 8-inch diameter ball could fit through. Fabric mesh openings within 50% of grid size.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-16
NO. 10 – GATES/BOLLARDS/ACCESS BARRIERS
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Chain Link Fencing Gate Damaged or missing members Missing gate. Gates in place.
Broken or missing hinges such that gate cannot be easily opened and closed by a maintenance person.
Hinges intact and lubed. Gate is working freely.
Gate is out of plumb more than 6 inches and more than 1 foot out of design alignment.
Gate is aligned and vertical.
Missing stretcher bar, stretcher bands, and ties. Stretcher bar, bands, and ties in place.
Locking mechanism does not lock gate Locking device missing, no-functioning or does not link to all parts. Locking mechanism prevents opening of gate.
Openings in fabric Openings in fabric are such that an 8-inch diameter ball could fit through. Fabric mesh openings within 50% of grid size.
Bar Gate Damaged or missing cross bar Cross bar does not swing open or closed, is missing or is bent to where it does not prevent vehicle access.
Cross bar swings fully open and closed and prevents vehicle access.
Locking mechanism does not lock gate Locking device missing, no-functioning or does not link to all parts. Locking mechanism prevents opening of gate.
Support post damaged Support post does not hold cross bar up. Cross bar held up preventing vehicle access into facility.
Bollards Damaged or missing bollards Bollard broken, missing, does not fit into support hole or hinge broken or missing. No access for motorized vehicles to get into facility.
Bollards do not lock Locking assembly or lock missing or cannot be attached to lock bollard in place. No access for motorized vehicles to get into facility.
Boulders Dislodged boulders Boulders not located to prevent motorized vehicle access. No access for motorized vehicles to get into facility.
Evidence of vehicles
circumventing boulders
Motorized vehicles going around or
between boulders.
No access for motorized vehicles to get
into facility.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-17
NO. 11 – GROUNDS (LANDSCAPING)
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Site Trash and debris Any trash and debris which exceed 1 cubic foot per 1,000 square feet (this is about equal to the amount of trash it would take to fill up one standard size office garbage can). In general, there should be no visual evidence of dumping.
Trash and debris cleared from site.
Noxious weeds Any noxious or nuisance vegetation which may constitute a hazard to City personnel or the public.
Noxious and nuisance vegetation removed according to applicable regulations. No danger of noxious vegetation where City personnel or the public might normally be.
Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film.
Excessive growth of grass/groundcover Grass or groundcover exceeds 18 inches in height. Grass or groundcover mowed to a height no greater than 6 inches.
Trees and Shrubs Hazard tree identified Any tree or limb of a tree identified as having a potential to fall and cause property damage or threaten human life. A hazard tree identified by a qualified arborist must be removed as soon as possible.
No hazard trees in facility.
Damaged tree or
shrub identified
Limbs or parts of trees or shrubs that are
split or broken which affect more than 25% of the total foliage of the tree or shrub.
Trees and shrubs with less than 5% of total
foliage with split or broken limbs.
Trees or shrubs that have been blown
down or knocked over.
No blown down vegetation or knocked over
vegetation. Trees or shrubs free of injury.
Trees or shrubs which are not adequately supported or are leaning over, causing exposure of the roots.
Tree or shrub in place and adequately supported; dead or diseased trees removed.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-18
NO. 12 – ACCESS ROADS
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Site Trash and debris Trash and debris exceeds 1 cubic foot per 1,000 square feet (i.e., trash and debris would fill up one standards size garbage can).
Roadway drivable by maintenance vehicles.
Debris which could damage vehicle tires or prohibit use of road. Roadway drivable by maintenance vehicles.
Contaminants and
pollution
Any evidence of contaminants or pollution
such as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of
according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film.
Blocked roadway Any obstruction which reduces clearance above road surface to less than 14 feet. Roadway overhead clear to 14 feet high.
Any obstruction restricting the access to a 10- to 12 foot width for a distance of more than 12 feet or any point restricting access to less than a 10 foot width.
At least 12-foot of width on access road.
Road Surface Erosion, settlement, potholes, soft spots,
ruts
Any surface defect which hinders or prevents maintenance access. Road drivable by maintenance vehicles.
Vegetation on road surface Trees or other vegetation prevent access to facility by maintenance vehicles. Maintenance vehicles can access facility.
Shoulders and Ditches Erosion Erosion within 1 foot of the roadway more than 8 inches wide and 6 inches deep. Shoulder free of erosion and matching the surrounding road.
Weeds and brush Weeds and brush exceed 18 inches in height or hinder maintenance access. Weeds and brush cut to 2 inches in height or cleared in such a way as to allow maintenance access.
Modular Grid Pavement Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries or
paint.
Materials removed and disposed of according to applicable regulations. Source
control BMPs implemented if appropriate. No contaminants present other than a surface oil film.
Damaged or missing blocks/grids Access surface compacted because of broken on missing modular block. Access road surface restored so road infiltrates.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-31
NO. 21 – PROPRIETARY FACILITY CARTRIDGE FILTER SYSTEMS
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
In addition to the specific maintenance criteria provided below, all manufacturers’ requirements shall be followed.
Facility Documentation Update facility inspection record after each inspection. Maintenance records are up to date.
Provide certification of replaced filter media. Filter media is certified to meet manufacturer specifications.
Site Trash and debris Any trash or debris which impairs the function of the facility. Trash and debris removed from facility.
Contaminants and pollution Any evidence of contaminants or pollution such as oils, gasoline, concrete slurries or paint.
Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film.
Life cycle Once per year. Facility is re-inspected and any needed maintenance performed.
Vault Treatment Area Sediment on vault floor Varies – Refer to manufacturer’s requirements. Vault is free of sediment.
Sediment on top of cartridges Varies – Refer to manufacturer’s requirements. Vault is free of sediment.
Multiple scum lines above top of
cartridges
Thick or multiple scum lines above top of cartridges. Probably due to plugged
canisters or underdrain manifold.
Cause of plugging corrected, canisters replaced if necessary.
Vault Structure Damage to wall, frame, bottom, and/or
top slab
Cracks wider than ½-inch and any evidence of soil particles entering the
structure through the cracks, or qualified inspection personnel determines the vault is not structurally sound.
Vault replaced or repaired to design specifications.
Baffles damaged Baffles corroding, cracking warping, and/or showing signs of failure as determined by maintenance/inspection person.
Repair or replace baffles to specification.
Filter Media Standing water in vault Varies – Refer to manufacturer’s requirements. No standing water in vault 24 hours after a rain event.
Short circuiting Flows do not properly enter filter cartridges. Flows go through filter media.
Underdrains and Clean-Outs Sediment and debris Underdrains or clean-outs partially plugged or filled with sediment and/or debris. Underdrains and clean-outs free of sediment and debris.
Inlet/Outlet Pipe Sediment accumulation Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment.
Trash and debris Trash and debris accumulated in
inlet/outlet pipes (includes floatables and non-floatables).
No trash or debris in pipes.
Damaged inlet/outlet pipe Cracks wider than ½-inch at the joint of the inlet/outlet pipes or any evidence of soil entering at the joints of the inlet/outlet pipes.
No cracks more than ¼-inch wide at the joint of the inlet/outlet pipe.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-32
NO. 21 – PROPRIETARY FACILITY CARTRIDGE FILTER SYSTEMS
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Access Manhole Cover/lid not in place Cover/lid is missing or only partially in place. Any open manhole requires immediate maintenance.
Manhole access covered.
Locking mechanism
not working
Mechanism cannot be opened by one
maintenance person with proper tools. Bolts cannot be seated. Self-locking cover/lid does not work.
Mechanism opens with proper tools.
Cover/lid difficult to remove One maintenance person cannot remove cover/lid after applying 80 lbs of lift. Cover/lid can be removed and reinstalled by one maintenance person.
Ladder rungs unsafe Missing rungs, misalignment, rust, or cracks. Ladder meets design standards. Allows maintenance person safe access.
Large Access
Doors/Plate
Damaged or difficult
to open
Large access doors or plates cannot be
opened/removed using normal equipment.
Replace or repair access door so it can
opened as designed.
Gaps, doesn't cover completely Large access doors not flat and/or access opening not completely covered. Doors close flat and cover access opening completely.
Lifting Rings missing, rusted Lifting rings not capable of lifting weight of door or plate. Lifting rings sufficient to lift or remove door or plate.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-37
NO. 24 – CATCH BASIN INSERT (NOT ALLOWED IN THE CITY FOR OIL CONTROL)
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-39
NO. 27 – GRAVEL FILLED DISPERSION TRENCH BMP
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Preventive Blocking, obstructions Debris or trash limiting flow to dispersion trench or preventing spreader function. Dispersion trench able to receive full flow prior to and during wet season.
Site Trash and debris Trash or debris that could end up in the dispersion trench is evident. No trash or debris that could get into the dispersion trench can be found.
Pipes Plugged inlet The entrance to the pipe is restricted due to sediment, trash, or debris. The entrance to the pipe is not restricted.
Vegetation/root growth in pipes Vegetation/roots that reduce free movement of water through pipes. Water flows freely through pipes.
Plugged pipe Sediment or other material prevents free flow of water through the pipe. Water flows freely through pipes.
Broken pipe or joint leaks. Damage to the pipe or pipe joints allowing water to seep out. Pipe does not allow water to exit other than at the outlet to the trench.
Broken or missing cleanout caps Cleanout caps are broken, missing, or buried. Cleanout caps are accessible and intact.
Structure Flow not reaching trench Flows are not getting into the trench as designed. Water enters and exits trench as designed.
Perforated pipe
plugged
Flow not able to enter or properly exit from
perforated pipe.
Water freely enters and exits perforated
pipe.
Flow not spreading evenly at outlet of trench
Outlet flows channelizing or not spreading evenly from trench. Sheet flow occurs at the outlet of the trench.
Cleanout/inspection access does not allow cleaning or inspection of perforated pipe
The cleanout/inspection access is not available. Cleanout/inspection access is available.
Filter Media Plugged filter media Filter media plugged. Flow through filter media is normal.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-40
NO. 28 – NATIVE VEGETATED SURFACE/NATIVE VEGETATED LANDSCAPE BMP
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Site Trash and debris Trash and debris accumulated on the native vegetated surface/native vegetated landscape site.
Native vegetated surface site free of any trash or debris.
Vegetation Insufficient vegetation Less than two species each of native
trees, shrubs, and groundcover occur in the design area.
A minimum of two species each of native
trees, shrubs, and groundcover is established and healthy.
Poor vegetation
coverage
Less than 90% if the required vegetated
area has healthy growth.
A minimum of 90% of the required
vegetated area has healthy growth.
Undesirable
vegetation present
Weeds, blackberry, and other undesirable
plants are invading more than 10% of vegetated area.
Less than 10% undesirable vegetation
occurs in the required native vegetated surface area.
Vegetated Area Soil compaction Soil in the native vegetation area
compacted.
Less than 8% of native vegetation area is
compacted.
Insufficient vegetation Less than 3.5 square feet of native vegetation area for every 1 square foot of impervious surface.
A minimum of 3.5 square feet of native vegetation area for every 1 square foot of impervious surface.
Excess slope Slope of native vegetation area greater than 15%. Slope of native growth area does not exceed 15%.
NO. 29 – PERFORATED PIPE CONNECTIONS BMP
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Preventive Blocking, obstructions Debris or trash limiting flow into perforated pipe system or outfall of BMP is plugged or otherwise nonfunctioning.
Outfall of BMP is receiving designed flows from perforated pipe connection.
Inflow Inflow impeded Inflow into the perforated pipe is partially or fully blocked or altered to prevent flow from
getting into the pipe.
Inflow to the perforated pipe is unimpeded.
Pipe Trench Area Surface compacted Ground surface over the perforated pipe trench is compacted or covered with impermeable material.
Ground surface over the perforated pipe is not compacted and free of any impervious cover.
Outflow Outflow impeded Outflow from the perforated pipe into the
public drainage system is blocked.
Outflow to the public drainage system is
unimpeded.
Outfall Area Erosion or landslides Existence of the perforated pipe is causing or exasperating erosion or landslides. Perforated pipe system is sealed off and an alternative BMP is implemented.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-43
NO. 32 – RAINWATER HARVESTING BMP
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Preventive Insufficient storage volume No rain water in storage unit at the beginning of the rain season. Maximum storage available at the beginning of the rain season (Oct. 1).
Collection Area Trash and debris Trash of debris on collection area may plug filter system Collection area clear of trash and debris.
Filter Restricted or plugged filter Filter is partially or fully plugged preventing water from getting in to the storage unit. Filter is allowing collection water into storage unit.
NO. 33 – ROCK PAD BMP
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Site Trash and debris Trash and debris accumulated on rock pad site. Rock pad site free of any trash or debris.
Rock Pad Area Insufficient rock pad size Rock pad is not 2 feet by 3 feet by 6 inches thick or as designed. Rock pad is 2 feet by 3 feet by 6 inches thick or as designed.
Vegetation growth Vegetation is seen growing in or through rock pad. No vegetation within rock pad area.
Rock Exposed soil Soil can be seen through the rock pad. Full thickness of the rock pad is in place,
no soil visible through rock pad.
NO. 34 – SHEET FLOW BMP
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Site Trash and debris Trash and debris accumulated on the sheet flow site. Sheet flow site free of any trash or debris.
Sheet flow area Erosion Soil erosion occurring in sheet flow zone. Soil erosion is not occurring and rills and channels have been repaired.
Concentrated flow Sheet flow is not occurring in the sheet flow zone. Sheet flow area is regraded to provide sheet flow.
NO. 35 – SPLASH BLOCK BMP
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN
MAINTENANCE IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Site Trash and debris Trash and debris accumulated on the splash block. Splash block site free of any trash or debris.
Splash Block Dislodged splash
block
Splash block moved from outlet of
downspout.
Splash block correctly positioned to catch
discharge from downspout.
Channeling Water coming off the splash block causing erosion. No erosion occurs from the splash block.
Downspout water misdirected Water coming from the downspout is not discharging to the dispersal area. Water is discharging normally to the dispersal area.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
2017 City of Renton Surface Water Design Manual 12/12/2016 A-47
NO. 38 – SOIL AMENDMENT BMP
MAINTENANCE COMPONENT DEFECT OR PROBLEM CONDITIONS WHEN MAINTENANCE IS NEEDED RESULTS EXPECTED WHEN MAINTENANCE IS PERFORMED
Soil Media Unhealthy vegetation Vegetation not fully covering ground surface or vegetation health is poor.
Yellowing: possible Nitrogen (N) deficiency. Poor growth: possible
Phosphorous (P) deficiency. Poor flowering, spotting or curled leaves, or weak roots or stems: possible Potassium
(K) deficiency.
Plants are healthy and appropriate for site conditions
Inadequate soil nutrients and
structure
In the fall, return leaf fall and shredded woody materials from the landscape to the
site when possible
Soil providing plant nutrients and structure
Excessive vegetation growth Grass becomes excessively tall (greater than 10 inches); nuisance weeds and other
vegetation start to take over.
Healthy turf- “grasscycle” (mulch-mow or leave the clippings) to build turf health
Weeds Preventive maintenance Avoid use of pesticides (bug and weed killers), like “weed & feed,” which damage
the soil
Fertilizer needed Where fertilization is needed (mainly turf and annual flower beds), a moderate
fertilization program should be used which relies on compost, natural fertilizers or slow-release synthetic balanced fertilizers
Integrated Pest Management (IPM) protocols for fertilization followed
Bare spots Bare spots on soil No bare spots, area covered with
vegetation or mulch mixed into the underlying soil.
Compaction Poor infiltration due to soil compaction
• To remediate compaction, aerate
soil, till to at least 8-inch depth, or further amend soil with compost and
re-till
• If areas are turf, aerate compacted areas and top dress them with 1/4 to
1/2 inch of compost to renovate them
• If drainage is still slow, consider investigating alternative causes (e.g.,
high wet season groundwater levels, low permeability soils)
• Also consider site use and protection
from compacting activities
No soil compaction
Poor infiltration Soils become waterlogged, do not appear to be infiltrating. Facility infiltrating properly
Erosion/Scouring Erosion Areas of potential erosion are visible Causes of erosion (e.g., concentrate flow entering area, channelization of runoff) identified and damaged area stabilized (regrade, rock, vegetation, erosion control
matting).For deep channels or cuts (over 3 inches in ponding depth), temporary
erosion control measures in place until
permanent repairs can be made
Grass/Vegetation Unhealthy vegetation Less than 75% of planted vegetation is
healthy with a generally good appearance.
Healthy vegetation. Unhealthy plants
removed/replaced. Appropriate vegetation planted in terms of exposure, soil and soil
moisture.
Noxious Weeds Noxious weeds Listed noxious vegetation is present (refer to current County noxious weed list). No noxious weeds present.
APPENDIX A MAINTENANCE REQUIREMENTS FOR STORMWATER FACILITIES AND ON-SITE BMPS
12/12/2016 2017 City of Renton Surface Water Design Manual A-48
NO. 39 – RETAINED TREES
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITIONS WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
Tree Dead or declining Dead, damaged, or declining Tree replaced per planting plan or acceptable substitute
NO. 40 – FILTERRA SYSTEM
MAINTENANCE
COMPONENT
DEFECT OR
PROBLEM
CONDITION WHEN MAINTENANCE
IS NEEDED
RESULTS EXPECTED WHEN
MAINTENANCE IS PERFORMED
In addition to the specific maintenance criteria provided below, all manufacturer’s requirements shall be followed.
Facility – General Requirements Life cycle Once per year, except mulch and trash removal twice per year Facility is re-inspected and any needed maintenance performed
Contaminants and pollution Any evidence of contaminants or pollution such as oil, gasoline, concrete slurries, or paint
Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate.
No contaminants present other than a surface oil film.
Inlet Excessive sediment or trash accumulation Accumulated sediments or trash impair free flow of water into system Inlet should be free of obstructions allowing free distributed flow of water into system
Mulch Cover Trash and floatable debris accumulation Excessive trash and/or debris accumulation Minimal trash or other debris on mulch cover. Mulch cover raked level.
“Ponding” of water on mulch cover “Ponding” in unit could be indicative of clogging due to excessive fine sediment accumulation or spill of petroleum oils
Stormwater should drain freely and evenly through mulch cover
Proprietary Filter Media/ Vegetation Substrate
“Ponding” of water on mulch cover after mulch cover has been maintained
Excessive fine sediment passes the mulch cover and clogs the filter media/vegetative substrate
Stormwater should drain freely and evenly through mulch cover. Replace substrate and vegetation when needed
Vegetation Plants not growing or in poor condition Soil/mulch too wet, evidence of spill, incorrect plant selection, pest infestation,
and/or vandalism to plants
Plants should be healthy and pest free
Media/mulch too dry Irrigation is required
Plants absent Plants absent Appropriate plants are present
Excessive plant growth Excessive plant growth inhibits facility function or becomes a hazard for pedestrian and vehicular circulation and safety
Pruning and/or thinning vegetation maintains proper plant density. Appropriate plants are present.
Structure Structure has visible cracks Cracks wider than ½ inch
Evidence of soil particles entering the structure through the cracks
Structure is sealed and structurally sound