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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. 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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