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STRUCTURAL CIVIL SEISMIC ENGINEERI
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08/26/14 Renton Highlands Library
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Technical Information Report �
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PREPARED FOR: j
King County Library System j
960 Newport Way NW /
Issaquah,WA 98027 /
(425)369-3200 /
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PREPARED THROUGH: /
THA Architecture j
9 r'�.• d A�, 733 SW Oak Street ;j
V pt H+sy� Q Portland, OR 97205 ,,/
Q'�:`�' "��. (503)227-1254 ,/
`�l` � �� CONTACT/ Andrew Schilling /
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PREPARED BY: /
a3ss� � COUGHLIN PORTER LUNDEEN 'j
�s.�'`-'c�5��.c�'`'G�� 801 Second Avenue, Suite 900 j
� `S�O?�,�L Y��' Seattle, WA 98104 �
P 206.343.0460 j
CONTACT/ Bart Balko, P.E. �
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TECHNICAL INFORMATION REPORT
AND HYDROLOGIC ANALYSIS
Renton Highlands Library
Coughlin Porter Lundeen Project No. C131436-01
August 26"', 2014
TABLE OF CONTENTS
Section Page
I. PROJECT OVERVIEW.....................................................................................................................................1
GENERAL DESCRIPTION......................................................................................................................................1
EXISTINGCONDITIONS........................................................................................................................................1
PROPOSEDDRAINAGE SYSTEM...........................................................................................................................1
II. CONDITIONS AND REQUIREMENTS SUMMARY.......................................................................................2
CITY OF RENTON AMENDMENTS TO THE KING COUNTY SURFACE WATER MANAGEMENT DESIGN MANUAL CORE
REQUIREMENTS:.................................................................................................................................................2
SPECIAL REQUIREMENTS:...................................................................................................................................2 �
PROJECT SPECIFIC REQUIREMENTS:...................................................................................................................2 ;
III. OFF-SITE ANALYSIS.....................................................................................................................................3
TASK 1 —STUDY AREA DEFINITION AND MAPS ....................................................................................................3
TASK2-RESOURCE REVIEW..............................................................................................................................3
TASK3-FIELD INSPECTION................................................................................................................................3
TASK 4-DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS...........................................................3 I
UPSTREAMANALYSIS..........................................................................................................................................3 I
DOWNSTREAMANALYSIS....................................................................................................................................3
TASK 5—MITIGATION OF EXISTING OR POTENTIAL PROBLEMS.............................................................................3
IV. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN.....................................4
EXISTINGSITE HYDROLOGY(PART A�.................................................................................................................4
DEVELOPED SITE HYDROLOGY(PART B� ............................................................................................................4
PERFORMANCE STANDARDS AND FLOW CONTROL SYSTEM(PARTS C AND D�.....................................................5 I
WATERQUALITY SYSTEM(PART E�....................................................................................................................5
STANDARDREQUIREMENTS................................................................................................................................5
V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN....................................................................................6
STANDARD REQUIREMENTS(BASED ON KCSW DM AND SAO�:...........................................................................6
ON-SITE CONVEYANCE.......................................................................................................................................6
VI. SPECIAL REPORTS AND STUDIES............................................................................................................8
VII. OTHER PERMITS.........................................................................................................................................9
VIII. CSWPPP ANALYSIS AND DESIGN.........................................................................................................10
STANDARD REQUIREMENTS.................................................... ................1 O
..........................................................
IX. BOND QUANTITY, FACILITY SUMMARIES,AND DECLARATION OF COVENANT............................11
X. OPERATION AND MAINTENANCE MANUAL...........................................................................................12
STANDARDMAINTENANCE.................................................................................................................................12
COUGHLINPORTERLUNDEEN Renton Highlands Lihrar��
1 Rentnn.1b'���hin�tnn
LIST OF FIGURES
Figure 1 —TIR Worksheet
Figure 2—Parcel Conditions
Figure 3—Site Location
Figure 4—Storm GIS Layout
Figure 5—Drainage Basin Map
Figure 6—Flow Control Map
Figure 7—King County iMAP - Floodplain
Figure 8—Ciry of Renton Soil Survey Map
Figure 9—Drainage Complaints Map
Figure 10—KCRTS Peak Flow Calculations
Figure 11—Conveyance Calculations
LIST OF TABLES
Table 1 - Existing Site Conditions Area Breakdown............................................................................................4
Table 2 - Developed Site Conditions Area Breakdown .......................................................................................4
I
COUGHLINPORTERLUNDEEN Renton Highlands Library
li Renton,Washington
I. PROJECT OVERVIEW
General Description
The following Technical Information Report(TIR) provides the technical information and design analysis
required for developing the Drainage and Temporary Erosion and Sedimentation Control Plan (TESC)for the
Renton Highlands Library. The stormwater design for the project was based on the requirements set forth in
the City of Renton Amendments to the 2009 King County Surface Water Design Manual (KCSWDM) (See
Figure 1 — Technica!Information Report Worksheet) and the 2009 KCSWDM itself.
Renton Highlands Library is located within the City of Renton, located at the corner of Sunset Blvd NE and
NE 10�h Street(See Figure 3—Sife Location). The site is in the NW '/<of the NW '/4 of Section 9, Township
23 North, Range 5 East, Willamette Meridian.
The project consists of demolishing the existing two story apartment building and constructing a library in its
place. Overall, the project will include a one-story building with one level of basement parking and exterior
landscaping, including a stormwater planter. The existing site consists of 0.209 acres of impervious area and
0.160 acres of pervious area. The propos; � conditions will consist of 0.351 acres of impervious area and �
0.018 acres of pervious area. Soils for the area were mapped using the King County Soil Survey maps(See
Figure 6—SCS Soil Survey).
Runoff from the site will be conveyed to the two existing storm systems, which run west and north in Sunset
Boulevard NE and NE 10`h Street, respectively. The runoff is then conveyed to Johns Creek and eventually
into Lake Washington, through Gene Coulon Park.
Existing Conditions
The existing site consists of a two story apartment building and adjacent parking lot. The parking lot takes up
the majority of the south side of the site while the apartment building is located on the north side. The north
side of the site also consists of a few trees and connecting concrete paths. (See Figures 4 and 5)
Proposed Drainage System �
The proposed site will result in over 2,000 square feet of new or replaced impervious area, which, per the
King County Surface Water Design Manual, requires a "Full Drainage Reviev�'. A Full Drainage Review
requires onsite flow control for the total disturbed area of the project. According to the City of Renton
Amendments to the King County Surface Water Manual, dated February 2010, page 1-34, the exception to
that rule is that the facility requirement in Peak Rate Flow Control Standard Areas (See Figure 6—Flow
Control Map) is waived for any threshold discharge area in which the target surfaces subject to this
requirement will generate no more than a �.1-cfs increase in the existing site conditions 100-year peak
flow. The project's post-developed discharge will be 0.01-cfs more than the existing runoff(See Figure 10—
KCRTS Peak Flow Calculations}, and therefore flow control is not required since it is not in excess of 0.01-cfs
per the above mentioned exception. The runoff from the proposed building and site will be directed to the
storm system that runs beneath both Sunset Boulevard NE and NE 10'h Street. These storm drains
eventually merge and make their way to Lake Washington via Johns Creek. One new catch basin will be
installed on the existing storm line at the north east corner of the property on NE 10`h Street to discharge the
runoff from the site. Please refer to Section II I for a full downstream analysis and Section IV for a Flow
Control analysis.
COUGHLINPORTERLUNDEEN Renton Highlands Library
1 Renton,Washington
II. CONDITIONS AND REQUIREMENTS SUMMARY
This section will address the requirements set forth by the Core and Special Requirements listed in Chapter 1
of the Ciry of Renton's Amendments to the 2009 King County Surface Water Design Manual.
City of Renton Amendments to the 2009 King County Surface Water Management Design Manual
Core Requirements:
1. Discharqe at the Natural Location(1.2.1):All developed flows will be conveyed to the existing closed
conveyance system on-site and directed to Lake Washington.
2. Off-site AnalVsis (1.2.2): Refer to Sections II I and IV. A Level 1 downstream analysis has been
performed.
3. Flow Control(1.2.3.9): Refer to Section IV.As the threshold discharge area in which target surfaces
subject to flow control will not generate more than a 0.1-cfs increase in the existing site condition's 100-
year peak flow, detention is not required.
4. Conveyance Sysfem(1.2.4): Refer to Section V. Closed pipe systems have been provided for on-site
stormwater conveyance.
5. Erosion and Sedimentation ControJ(1.2.5): Refer to Section VIII. The project will construct a series of
sediment controls to address the specific conditions at the site.
6. Maintenance and Operations(1.2.6): Refer to Secti�n X. The proposed storm drainage system will be
owned, operated and maintained by the owner.
7. Financia!Guarantees and Liability(1.2.7): The owner and contractor will obtain all necessary permits
prior to the beginning of construction. The City of Renton/King County Library System (KCLS)will be
responsible for required bonds.
8. Water Quality(1.2.8): Refer to Section IV, Part E. Water quality treatment is not required as part of this
development because no pollution generating surfaces are being added or replaced and the project is
under the triggering threshold.
Special Requirements:
Special Requirement#1.Other Adopted Area-Specific Requirements Section 1.3.1
• Critical Drainage Areas(CDAs): Not Applicable
• Master Drainage Plans(MDPs):There are no known master drainage plans covering this project
site.
• Basin Plans (BPs): The project is located within Lake Washington Drainage Basin.
• Lake Management Plans(LMPs): Not Applicable
• Shared Facility Drainage Plans(SFDPs): Not Applicable
Special Requirement#2.Flood Hazard Area Delineation, Section 1.3.2: See Figure 7 for 100-yr flood zone.
No work affecting the flood storage will take place within the 100-yr flood zone.
Special Requirement#3. Flood Protection Facilities, Section 1.3.3: Not Applicable
Special Requirement#4.Source Controls, Section 1.3.4: See attached Activity Worksheet and Required
BMP's.
Special Requirement#5.Oil Control: Minimal traffic is anticipated in this area. No oil control is required.
Project Specific Requirements:
There are no additional requirements for this portion of the project. Design and construction will abide by
requirements set forth in these documents and King County.
COUGHLINPORTERLUNDEEN Renton Highlands Library
2 Renton,Washington
III. OFF-SITE ANALYSIS
Task 1 -Study Area Definition and Maps
The Renton drainage basin map was used to verify that the site was fully in the Lake Washington East drainage
basin (See Figure 5—Drainage Basin Map).
Task 2- Resource Review
a) Adopted Basin Plans Lake Washington East Drainage Basin
b) Floodplain/floodway(FEMA) Maps Site is not located in the floodplain (See Figure 7)
c) Off-site Analysis Reports N/A
d) Sensitive Areas Folio See Figures 7—King County iMAP
e) Drainage Complaints and Studies See Figure 9
f) Road Drainage Problems N/A
g) King County Soils Survey: See Figure 8—City of Renton S�il Survey Map
h) Wetland Inventory Maps: No Wetlands
i) Migrating Rivers Study N/A
j) DOE's Section 303d List of Polluted Waters
k) KC Designated Water Quality Problems No WQ Problems
I) City of Renton critical maps: No Critical Areas
Task 3- Field Inspection
Site visits have been made to gather information including an analysis of the discharge from the site. Please
refer to Task 4, Downstream Analysis below for more information.
Task 4- Drainage System Description and Problem Descriptions
Runoff from the site will be conveyed to two existing storm systems. The maj�rity of the site will tie into the 12"
storm pipe that runs north/west on Sunset Boulevard NE. The remaining roof runoff will by conveyed to the
existing 6"system on NE 10�h Street via a new area drain at the northern corner of the project site. A catch
basin will be added to the drainage system to tie in runoff from the site. Both drainage systems are directed to
Lake Washington via John's Creek. There are no existing drainage complaints or additional drainage problems
as the site.
Upstream Analysis
The site is within the Lake Washington East drainage basin. No known drainage enters the site from upstream.
Downstream Analysis
The existing site discharges to existing catch basins located in NE 10`� Street and Sunset Boulevard NE. These
storm systems run wesUnorth to NE Park Drive,where the stormwater discharge continues in a closed
conveyance system until NE Park Drive reaches Lake Washington Boulevard N, and discharge into John's
Creek, which then discharges into Lake Washington through Gene Coulon Park. No known drainage
complaints are within a quarter-mile of the site(see Figure 9—Drainage Complaints Map). The storm system is
part of the Lake Washington East drainage basin.
Task 5—Mitigation of Existing or Potential Problems
There are no known problems drainage complaints downstream of the site (See Figure 9). No mitigation is
proposed.
COUGHLINPORTERLUNDEEN Renton Highlands Library
3 Renton,Washington
IV. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN
Existing Site Hydrology(Part A)
The existing site totals 0.369 acres and consists of an existing two story apartment building and a parking lot.
The site slopes in a westerly direction with drainage described in Section III Downstream Analysis. These
conditions are summarized in Table 1 below.
Table 1 -Existing Site Conditions Area Breakdown
Land Cover Area Description
Impervious Area 0.209 acres Building roof, parking lot, and concrete walkways
Penrious& Landscape 0.160 acres Associated landscaping
Total Project Area 0.369 acres Total site area
Percentage of Impervious Area 57%
Developed Site Hydrology(Part B)
The developed site hydrology will increase the amount of impervious area by 0.149 acres. A summary of the
basin information is shown in Table 2.
Table 2-Developed Site Conditions Area Breakdown
Land Cover Area Description
Impervious Area 0.351 acres Building roof,walkways and 50%of canopy
area contributing to stormwater planter (as
modeled)
Stormwater Planter pervious area (This area is
Stormwater Planter(S.P.) 0.0023 acres; included in the impervious/pervious sections
and does not count towards the total)
Modeled as 50% Impervious, 50% Pervious,
Contributing canopy area to S.P. 0.017 acres (included in the impervious/pervious sections,
and does not count towards the total)
Pervious/Landscape 0.018 acres Associated landscaping and 50% of canopy
area contributing to stormwater planter(as
modeled)
Total Project Area 0.369 acres Total site area
Percentage of Impervious Area 95%
COUGHLINPORTERLUNDEEN Renton Highlands Library
4 Renton.Washington
Performance Standards and Fiow Control System (Parts C and D)
Per Figure 6, the site is governed by Peak Rate flow Control Standards. The site meets exception#1 on page
1-34 of the City of Renton Amendments to the 2009 KCSWDM. Therefore, detention for this site is not required,
as the threshold discharge area in which target surfaces subject to flow control for this site will not generate
more than a 0.1-cfs increase in the existing site condition's 100-year peak flow(See Figure 1�KCRTS Peak
Flow Calculations).
Water Quality System (Part E)
Standard Requirements
Under core requirement#8 of the 2009 KCSWDM, a project must add or replace over 5000 square feet of �
Pollution Generating Impervious Surface(PGIS) before water qualiry treatment is required. Because the site's
total quantity of added or replaced PGIS is less than 5,000 square feet, the site is exempt from providing a water
quality treatment facility for the proposed redevelopment.
COUGHLINPORTERLUNDEEN Renton Highlands Library
5 Renton,Washington
V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN
This section discusses the criterion thai will be used to analyze and design the proposed storm conveyance
system.
Standard Requirements (based on 2009 KCSWDM and SAO):
1. Facilities must convey the 100-year flow wifhout overtopping the crown of the roadway, flooding
buildings, and if sheet flow occurs it must pass through a drainage easement. The existing drainage
facilities are not being altered and have no known overtopping issues. See Figure 9.
2. New pipe systems and culverts must convey the 25-year flow with at least 0.5 feet of freeboard.
(1.2.4-1). The new pipe systems will be designed to convey the 25-year flow with at least 0.5 feet of
freeboard.
3. Bridges must convey the 900-year flow and provide a minimum of two feet, varying up to six feet, of
clearance based on 25%of the mean channel width. (1.2.4-2J(4.3.5-6). N/A. This project does not
propose a bridge.
4. Drainage ditches must convey the 25-year flow with 0.5 feet of freeboard and the 900-year flow
without overtopping. (1.2.4-2). N/A. This project does not propose a drainage ditch.
5. Floodplain Crossings must not increase the base flood elevation by more than 0.01 feet(41(83.C)J
and shal/not reduce the flood storage volume�37(82.A)J. Piers shall not be constructed in the
FEMA floodway. j41(83.F.1)]. No work is being proposed within the base flood elevation or within the
FEMA floodway.
6. Stream Crossings shall require a bridge for class 1 streams that do not disturb or erode banks. For
type 2 and rype 3 steams, open bottom culverts or other method may be used that will not harm the
stream or inhibit fish passage. (60(95.8)J. There are no new stream (river)crossings associated with the
construction of this project.
7. Discharge at natural location is required and must produce no significant impacts to the
downstream property(9.2.9-1). The project will discharge to the existing storm systems in NE 10th Street
and Sunset Boulevard NE.
On-site Conveyance
Existing Conditions:
Runoff from the existing site is directed to the existing storm drainage systems located in Sunset Boulevard NE.
Developed Storm system description:
Stormwater from the roof is routed to roof drains and routed through a private storm system within the building.
There is a service drain to discharge the collected stormwater, which connects to the existing public storm
system in Sunset Boulevard NE.A small portion of the site (northeast p�rtion of the roof)discharges to the �
existing conveyance system in NE 10"'Street. Stormwater from the entry canopy is routed to the stormwater
planter, which has an underdrain connected to a storm pipe leading to an area drain on-site. This on-site
conveyance system leads to a 2'x2'x10'trench drain with an 8"perforated pipe to promote infiltration to the
maximum extent feasible. Downstream of the trench drain, the conveyance system continues and connects to
the existing public storm system in NE 10"'Street. Footing drains and shoring wall drains will be included and
will require a sump pump,which will be located within the garage and designed by the plumbing engineer. A
� E
COUGHLINPORTERLUNDEEN Renton Highlands Library
6 Renton,Washington
stormwater conveyance and backwater analysis for both the 25-year and 100-year storm events has been
conducted. (See Figure 11-Conveyance Calculations)
COUGHLINPORTERLUNDEEN Renton Highlands Library
7 Renton.Washington
VI. SPECIAL REPORTS AND STUDIES
1. Geotechnical Enqineerinq Study: Proposed Mixed-Use Development Renton, Washington. Prepared by
Geotech Consultants, Inc. on April 18, 2013. Not included at this time.
COUGHLINPORTERLUNDEEN Renton Highlands Library
8 Renton,Washington
VII. OTHER PERMITS
This project will require building and demolition permits from the City of Renton and a CSWPPP. See Section 8
for the CSWPPP (not included at this time).
J
COUGHLINPORTERLUNDEEN Renton Highlands Library
9 Renton,Washington
VIII. CSWPPP ANALYSIS AND DESIGN
This section lists the requirements that will be used when designing the TESC plan for this site.A copy of the
Draft CSWPPP has not been included at this time as the CSWPPP will be finalized after a contractor is brought
on board. A draft CSWPPP will be provided before permit is issued.
Standard Requirements
Erosion/Sedimentation Ptan shall include the following:
1. Facilities required include: Catch basin filter socks. (1.2.5-1). The project will provide sediment
protection at the existing catch basins and maintain existing hardscape areas until areas will be re-paved
2. Timing-For the period between November 1 through March 31 disturbed areas greater than 5,000 ',
square feet left undisturbed for more than 12 hours must be covered with mulch, sodding, or plastic �i
covering. A construction phasing plan shal!be provided to ensure that erosion contro/measures I
are installed prior to clearing and grading. (9.2.5-1). Notes addressing each of these items have been
placed on �ne civil engineering plans. �
3. Planning-Plan shall limit tributary drainage to an area to be cleared and graded. Delineate
dimension, stake and flag clearing limits (1.2.5-1). The clearing limits have been indicated on the TESC
plan. Notes addressing this item have been placed on the civil engineering plans.
4. Revegetation-Revegetate areas to be cleared as soon as practicable after grading. (1.2.5-1). Notes
addressing this item have been placed on the civil engineering plans.
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COUGHLINPORTERLUNDEEN Renton Highlands Library
10 Renton,Washington
IX. BOND QUANTITY, FACILITY SUMMARIES, AND DECLARATION OF COVENANT
A Bond Quantity Worksheet is not included at this time.
A Facilities Summaries Sheet has not been included in this section because there are no water quality or flow
control devices being installed as part of this project.
A Declaration of Covenant has not been included in this section because there are no water quality or flow
control devices being installed as part of this project.
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COUGHLINPORTERLUNDEEN Renton Highlands Library
11 Renton,Washington
X. OPERATION AND MAINTENANCE MANUAL �
Standard Maintenance
Per standards set forth in the King County Surface Water Design Manual, the owner will maintain facilities.
Sections of the King County Storm Water Management Design Manual outlining the Operations and
Maintenance of these facilities have been included in Appendix B.
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COUGHLINPORTERLUNDEEN Renton Highlands Library I
12 Renton,Washington
APPENDIX A
FIGURES
LIST OF FIGURES
Figure 1 —TIR Worksheet
Figure 2—Parcel Conditions
Figure 3—Site Location
Figure 4—Storm GIS Layout
Figure 5—Drainage Basin Map
Figure 6—Flow Control Map
Figure 7—King County iMAP- Floodplain
Figure 8—City of Renton Soil Survey Map
Figure 9—Drainage Complaints Map
Figure 10—KCRTS Peak Flow Calculations
Figure 11—Conveyance Calculations
COUGHLINPORTERLUNDEEN Renton E lighlands Lihrary
Rent�m,4�'achin�;ton
King County Department of Development and Environmental Services
Figure 1 : TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Part 1 PROJECT OWNER AND Part 2 PROJECT LOCATION AND
PROJECT ENGINEER DESCRIPTION
Project Owner: Project Name:
Kin Count Librar S stem Renton Hi hlands Librar
Address: Location
960 Newport Way NW
Issa uah, WA 98027
Phone: Township: 23N
425-369-3200 Range: 5E
Project Engineer: Section: 9
Bart Balko, P.E. �
Com an : Cou hlin Porter Lundeen
Address/Phone:
413 Pine Street, Ste 300
Seattle,WA 98101
206 343-0460 I
Part 3 TYPE OF PERMIT Part 4 OTHER REVIEWS AND PERMITS
APPLICATION
❑ Subdivison ❑ DFW HPA ❑ Shoreline Management
❑ Short Subdivision ❑ COE 404 ❑ Rockery
❑ Grading ❑ DOE Dam Safety ❑ Structural Vaults
❑ Commercial ❑ FEMA Floodplain ❑ Other
� Other: SPR ❑ COE Wetlands
Part 5 SITE COMMUNITY AND DRAINAGE BASIN
Community: '
Renton Hi hlands
Drainage Basin:
Lake Washin ton East Draina e Basin
Part 6 SITE CHARACTERISTICS
❑ River ❑ Floodplain
❑ Stream ❑ Wetlands '
❑ Critical Stream Reach ❑ Seeps/Springs
❑ Depressions/Swales ❑ High Groundwater Table
❑ Lake ❑ Groundwater Recharge J
❑ Steep Slopes ❑ Other
Part 7 SOILS
Soil Type Slopes Erosion Potential Erosive Velcoties
Brown, rusted sand 0-3%
with gravel, moist,
loose ill on top of light
gray, silty sand with
gravel that is fine to
medium grained, �I
moist, and very dense.
❑ Additional Sheets Attached
Part 8 DEVELOPMENT LIMITATIONS ;
REFERENCE LIMITATION/SITE CONSTRAINT
Ch.4 — Downstream Analysis
❑ Additional Sheets Attached
Part 9 ESC REQUIREMENTS
MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS
DURING CONSTRUCTION AFTER CONSTRUCTION
❑ Sedimentation Facilities � Stabilize Exposed Surface
� Stabilized Construction Entrance � Remove and Restore Temporary ESC '
� Perimeter Runoff Control Facilities i
� Clearing and Graing Restrictions � Clean and Remove All Silt and Debris
� Cover Practices � Ensure Operation of Permanent Facilities I
� Construction Sequence ❑ Flag Limits of SAO and open space I
preservation areas
❑ Other ❑ Other I
Part 10 SURFACE WATER SYSTEM
❑ Grass Lined ❑ Tank ❑ Infiltration Method of Analysis
Channel � Vault ❑ Depression
� Pipe System � Ener Dissa ator
gy p ❑ Flow Dispersal Compensation/Mitigati
❑ Open Channel � Wetland ❑ Waiver on of Eliminated Site �
❑ Dry Pond Storage j
❑ Stream ❑ Regional �
❑ Wet Pond Detention i�
Brief Description of System Operation II
A rain garden will be used.lt will have an underdrain and be piped to to public storm system in the
right-of-way.
Facility Related Site Limitations
Reference Facility Limitation
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
II or a civil engineer under my supervision my supenrision 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.
��5�
November 12, 2013
Si ned/Date
Figure 2 - Parcel Conditions
� King County
King County Districts and Development Conditions for parcel 7227801085
Parcel number 7227801085 Drainage East Lake Washington . • s;
Basin - Renton �� `
Address 970 HARRINGTON ' �1► � Site Location
AVE NE Cec,,� River� Lake ` �
_---- -- -
Jurisdiction Renton ' ' �'`�Y'- -'
ZipCode 98056 �-- � - "��'���'"ish� :
+ �
Kroll Map page 369 PLSS NW-9-23-5 ti • • ,
Latitude 47.5001 � '
Thomas Guide 626 .. �� �� .. #
page Longitude -122.18151
Electoral Districts
��; ���s;r.c: RNT 11-0980 Fire district does not apply
�g Coun}y C � ; ��__' �' � District 9, «ac�an Dunn Water district does not apply
(206)296-1009 D Sewer district does not apply
Congressional district 9 Water&Sewer district does not apply
Legislative district _ Parks& Recreation does not apply
School district K:: �:_ district
Seattle school board district does not apply(not in Hospital district Public Hospital District No. 1
Seattle) Rural library district Rural King County Library
District Court electoral district Southeast System
Tribal Lands? No
King County planning and , ��_�a:_��_�.= designations
NA, check with ___ does not
jurisdiction apply
Development conditions None -,�ral tc. : No
_����� r �_�___� �e �1-an does not apply � �ter ser��ce :��,�__ �_ __� does not
5an Gru::�h Area Urban aPp�y
�mmunity Service�_ _ does not apply �ds ti4PS zor_- 445
= Newcastle __-- does not
_ __-.' _____:_.--- app�Y
Coal mine hazards? None mapped
Forest Production district? No
Erosion hazards? None mapped
Agricultural Production district? No
Landslide hazards? None mapped
_=_, ," : - ? None mapped
Seismic hazards? None mapped - '
100-year flood plain? None mapped
Wetlands at this parcel? None mapped
This report was generated on 10/10/2013 1:19:02 PM
Contact us at .
�O 2010 Kinq County
Figure 3 - Site Location COUGHLINPORTERLUNDEEN
STRUCTURAL • CIVIL • SEISMIC ENGINEERING
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Project: Renton Highlands Library Designed By: CNB Date: 10-10-13
Project No. C13-14336-01 Client: THA Architects Checked By: BSB Sheet 1 of 1
413 PINE STREET •SUITE 300� SEATTLE,WA •98101 P: 206/343-0460 • F:206/343-5691
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' � Pro ert Lines Renton Highlands Library
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;C�ZJ(Ib King County J . • � - O 5828ft
The inlortnation inGuded on this map has been compdeA by King Counry staH from a vanety of sources and is sub�ect to change wdhout notice.King
County makes no represenfations o.warranties.express a implied,as to accuracy.completeness,timellness,a rghts to the use of such infortnation.
This dowmenl Is not mtended for use as a survey produd.King County shall not be IiaWe for arry general.spedal,indirect,incidenlal,or consequentlal s
damages i�Guding,but not timited b.bst revenues or bst profifs resuttirg from the use a misuse of Me intormation contained on th�s map.Any sale o( K ing Cou nty
this map or informatian on[his map is prohibifed except by wrrtten permissan of King County.
Dale�1iJ%10'2�13 Sourca�.King County iMAP-HyA•ogra.^,h�c Informa6on fh!tp���w�rn metrol�c go�^GIS�i41AP��
i MAP
Le ge nd
HYd���9�5 Artana�s 7:snono+nsl,
�. ACTNE � A:Ceda•Smrnmash
� �� 100 Year Floodplain g:p�,.r,,�,
f;! County Bountiary �__ L.akes and Larpe Rivers 10:Pu�diup-WhRe
� MauMain Peaks . ' SVeams �t:N's�u�y
Highways �/ Incorpora�ed Area 12:Cna„bars-Cw,�o�
❑ King County Drainage Basins ��9 County Water Resource
Inventory Areas
Streets
!1 iqhrvay S:9t i11ag uamesh
(GOflt� (Gpf1i�
The informatim inGuded on this map has been completl by King Courriy siaH fran a vanety o(soir�ces and is sub�ect to change witMu[notice.Kirg
Counry makes no representatbns or wartanties.express a impied.as fo accuracy.compleleness.fimeliness,a nghts to the use d wch iniorrnauon.
This document is nol�ntended for use as a survey producf.fGrg Counry shall nol be liable fa airy general.special,mdirect.nciderNal.a ca�rential a
damages mGuding,but not limited to,bst revenues a lost profAs resulling(rom the use or misuse of the in(ormation contamed on this map.My sale ot King County
this map or informffiion on this map is prohibited except by writlen perrnssan of King CourNy.
Date:t0i10l2013 Source:King Counry iMAP-Hydrograph�c Iniormation(http:�lwww.mevokc.gwlGI�MAP)
�Figure 8 - Soil Survey Map�
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fr Legend
,� - �t County 8oundary o King Counry Water Resource
� - f Inverrtory Areas
'1:� O S _c�;;;� f fiountain Peaks
'�� p 5 3R0 ST 'S� _,� Drainage SAidies � Kinp Courrty Drainage Basi�s
7 � _--_ '
Z Z rn � '_= Neighborhood Drainage .! Incorporated Area
5 4�H 5i .0 y' � Projects l��
�:- >
,� Streets
�; S�`��T � < � Regional Srormwater Facilities ��,yh,,,,y
ir.
Residendal Stormwater �na�•=
�+ p � � Facilitles
Sdd 'TH Sf � W �o"
G � t�''a � Commercial Stamwalar Lakes and Large Rivers
^ ckg Facilitias
� '',��Y'1'iPy �0 Streams
�p Highways
J� Dramage Complaints
:cIY00eKmgCounty 5'�a�r'r 0 2541ft
The informatbn included on th�s map has been compiled by King Couny staH hom a variely of sources and is sub�ect to change without notice.King
Counry makes no representations or wartanties,express or implied,as tn accuracy.completeness.timeliness,or rights lo the use of such in(ormation.
Th�s document is not intended(a use as a survey product.King Counry sliall not be liable(or any generel.special,indirect.incidental,a consequential a
damages inGuding,but not limited b,lost revenues or bst profits resutt�ng hom the use a misuse ot the information contained on this map.My sale of King County
this map or infortnatbn on this map is prohibdea except by wntten permisawn ot King County.
Date:1Q'10l2013 Source King Cn�.mty MAP�Strrm�sater I�ttp^�n�nv,metro<c.god�GS����PAPt
i MAP
Le ge nd
f�t CauMy Baundary o King Counry Water Resource
Inventory Areas
�r AAountain Peaks
� Drainage Studies ❑ King County Drainage Basins
� Neighborhood Drainage .f Incorporated Area
P rajects t'�
Streets
� Regional 5tarmwater Facilities ��,��,,,�,
� Residential Stormwater Artar�s
Facilities
Lxal
� Commercial Stormwater Lakes and Large Rivers
Facilities
Streams
Highways
Drainage Complaints
The irdormation inckded on this map has been comqled by IGng Camry staft hom a variery ot sources and is sub�ect to diange witl�out nooce.Kmg
�ounty makes no representafions a warranties.express or impFed.as b acwracy.completeness.timeliness,or ii�Ms lo tf�e use o(such in(omialion.
This dowmenl is not Inlended for use as a survey produd_King Counry shall not be 6able for amr general.special,indireU.nadeMal.or oor�sequenlial s �
��mages induding,but nol limited b,lost revenues or bst profits resWting 6om�he use or misuse of�he intormaGon contained on this map.My sale of King County
m�s map a informatan on this map is prohlbAed exczpt by writlen permission d King Counry.
Date:10I10l2D13 Source�.King County iMAP-Stomnvater(htlp:Nwww.metrdcc.gov/GI�MAP1
COVGHLINPORTERLUNDEEN
Figure 10- KCRTS Peak Flow Calculations
Renton Highlands Library- Detention Study: 08-25-2014
KCRTS SETUP:
Time Series Information:
Sea-Tac, Scale=l .0, Time Step=15-minute, Data Type=Reduced
Existinq
Till Grass=0.160 acres
Impervious=0.209 acres
TOTAL=0.369 acres
ProposedRG (Rain Garden)
Till Grass=0.018 acres
Impervious=0.��1 acres
TOTAL=0.369 acres
Peak Flows:
Fl�-�•a Freq,_i�cic�.- rin.,l�;'-i=
Tirke SeriFs File proposed.tsf
Projact Location.Sea-Tac
---Annual Peak Flow Rates--- ----Flow Frequency Analysis-------
Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob
{CFS} (CFS) Period
0 .170 6 8i27i01 18:00 0. 427 1 100.00 0.990
0 .118 8 9i17i02 17:45 0. 324 2 25.00 0 .960
C1 .324 2 12i08i02 17:15 0 231 3 10.00 0.900
0 .137 7 8i23iO4 14:30 0 191 4 5.00 0.800
0 .180 5 10i28iO4 16 :00 0 180 5 3.00 0.667
0 .191 4 10i27i05 10 :45 0 170 6 2.00 0.500
0 .231 3 10i25�06 22:45 0 137 7 1.30 0.231
0 . 427 1 1i09i08 6 :30 0. 118 8 1.10 0 .091
Comp�.it.ed F'eaks 0. 392 50.OD 0 980
Flow Frequency Analysis
Tirue Series File:existing.tsf
F'roject Location:Sea-Ta�
---Annual Peak Flow Rates--- -----Flow Frequency Analysis-------
Flc�w Rate Rank Time oE Peak - - Peaks - - Rank Return Prob
(CFS) {CFS) Period
0 .100 6 8i27/O1 18 00 0 327 1 100 .00 0 9'30
0 .073 8 1i05i02 15 :00 0. 223 2 25.00 0.960
ii . 223 2 12i08i02 17:15 0 140 3 10.00 0.900
0 . 080 7 8/23/04 14�30 0 135 4 5 00 0 .800
0 .135 4 11i17iO4 5 :00 0. 122 5 3.00 0.667
0 . 122 S 10i27i05 10:45 �]. 100 6 2.00 0.500
0 . 140 3 10/25/06 22:45 0 080 7 1 30 0.231
0 .327 1 1i09i08 6:30 0.073 8 1.10 0.091
�omputed Peaks 0 292 50.00 0.980
Conclusions:
Existing Q,00-0.327 --� -"�OOProposed(4•427) - QtooExisting(0.327)=�0. J
Proposed Q,00=0.423
Therefore, Detention is not required since the 100-year
peak flow rate for the proposed condition does not exceed
a 0.1 cfs increase from the existing 100-year peak flow rate.
Figure 11 - Conveyance Calculations
Renton Highlands LibrarX
Drainage Sub-Basiii Areas
Sub- Total Composite Asphalt/Concrete Roof Grass
Basin Area� C Value Area .Area Area
(Acres) (Sq. Ft.), C=0.90 (Sq. F�), C=0.90 (Sq. Fx), C=0.25
OFS 0.01 OJ9 0 487 100
AD1 0.00 0.90 IKl 0 0
AD2 0.01 0.90 257 0 0
CO1 0.00 0.00 0 0 0
SD2 O.11 0.90 4K?8 0 0
R2 O.II 0.90 4812 0 0
SD1 0.01 0.90 4(,5 0 0
Rl 0.23 0.90 0 10173 0
Totals 0.49 10543 10660 100
;'�'otc�s:
Conveyance Page 1/7
COUGHLINPORTERLUNDEEN Conveyance Analysis Renton Highlands Library
i
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CONVEYANCE SYSTEM ANALYSIS AND SIZING TABLE US1NG THE RATIONAL Iv1ETHOD
Sub Area C C*A Sum Tc i(R) I(R) Q(R) Q(D) Pipe Typ. Slope Q(F) V V L Tt %d/D
Basin (ac) C*A (min.) (c.f.s.) (c.f.s.) (in.) n (ft.ft.) (pipe (pipe (at (ft.) (min.)
From To Number full) full) Q(R))
OFS AD1 OFS 0.01 0.79 0.01 0.01 6.3 0.80 2.76 0.03 0.04 8 0.011 1.00% 1.43 4.10 2.73 17 0.1 7.00%
AD1 AD2 ADl 0.00 0.90 0.00 0.01 6.4 0.80 2.73 0.04 0.05 8 OA11 1.00% 1.43 4.10 2.16 25 02 10.00°/a
AD2 CO1 AD2 0.01 0.90 0.01 0.02 6.6 0.78 2.68 0.05 0.07 4 0.011 1.00% 1.43 4.10 2.22 18 0.1 12.00%
CO1 SD2 CO1 0.00 0.00 0.00 0.02 6.7 0.77 2.64 0.05 0.07 4 0.011 1.00% 1.43 4.10 2.19 16 0.1 12.00%
SD2 SD1 SD2 0.11 0.90 0.10 0.12 6.9 0.76 2.61 0.31 0.41 12 0.011 3.30% 7.67 9.77 5.84 15 0.0 12.00%
R2 SDl R2 0.11 0.90 0.10 0.10 6.3 0.80 2J6 0.27 0.36 8 0.011 OJS% 1.24 3.55 2.85 35 0.2 32.00%
SD1 SD4(DISCHARGE) SD1 0.01 0.90 0.01 0.23 6.9 0.76 2.60 0.59 0.77 12 0.011 2.00% 5.97 7.60 4.95 17 0.1 21.00%
R1 SD3 (DISCHARGE) Itl 0.23 090 0.21 0.21 6.3 0.80 2.76 0.58 0.75 8 0.011 2.00% 2.03 5.g2 4.93 2� 0.1 37.00%
Project: Renton Highlands Librar}� R= 25 Vr P(R)= 3 4� Calcs by: SEF Job No: C131�136-01
Location: Renton, Vb'A Date: 8/25/2014 Pa�e 1
� _. _
Conveyance Page 2/7
COUGHLINPORTERLUNDEEN Conveyance Analysis - 25 Year Renton Highlands Library
25 year Backwater Analysis Table Mannings Coefflcient o.o>>
The difterence between the water elevation and the rim should be greater than 0.0 teet.
Renton Highlands Library
upstrearn rim
Location Q L Pipe Tti P Outlet Inlet Barrel Rarrel Velocity Excel Critical T��' Friction HGI. Entry Entry Exit Outle[ Headwa[er Inlet Appro�ch Bend Bend Junction Junction Headwate► Rim Elev. O.K.7
Downstream Upstream (cfs) (FT) Diam(in). n Ele�� Elev Area Vclocitc Ilead Check Depth Elev Loss Elev Coef Loss Loss Control Depth Control Head Coefficien[ Loss Loss Loss CoeL E�evation Difference ,
Q L d n IF 18 A V H dc TW' Floss HGL Kc FNLoss Floc; F.luc HW?'D Flic H�� Kb HI Junc HW Rim HGL '�,
SD 3(DISCHARGE) RI 0.75 25 8 0.011 338.60 339.07 035 2.16 0.07 I.00 0.41 339.00 0.03 339.27 0.50 0.04 0.07 33U38 0.65 339.03 -0.07 0.68 0.05 0.00 O.DO 3393� 34525/ 5.90 es �I
' SD4 DISCHARGE) SDl 0.77 1; 1'_' 0.011 341.31 341J4 0.79 0.9R 0.02 I.W 037 341.7� 0.00 34?.A1 0.50 0.01 0.02 3d2.43 037 341J8 -0.02 0.12 0.00 0.00 031 342.42 343.97� I.�S vos
SDI R2 036 �� S 0.011 341.74 34?.00 0.3� 1.02 0.02 LL�O 0.28 ia'_.�- 0.01 342.93 0.�0 0.01 OA2 342.46 0.43 3�l?AZ -0.02 032 0.01 O.lX1 0.00 34?.4� 344.�0 r ?.0� vcs
SDI SD2 0.41 I� 12 0.011 341.74 342.23 0.79 0.52 0.00 lA0 026 34'_.32 O.OD 342.74 0.50 0.00 0.00 34'_.7i 025 3d1.99 O.DO 0.06 0.00 0.00 0.00 342.74 344.15 � IA1 es
SD2 COl 0.07 16 R 0.011 342.23 34239 03� 0.19 0.00 ].00 0.12 33=.?1 0.00 332.90 O50 0.00 0.00 34'__90 O.1R 34235 0.00 0.00 0.00 0.00 0.00 342.90 3�.60 1.70 cs
COI 4D2 0.07 18 R OAII 342.39 34257 03� 0.20 0.00 lA0 0.1'_ 34=.Q0 0.00 343.OG 0.?0 0.00 0.00 343Afi 0.18 342.5� O.pU 0.00 0.00 0.00 O.W 343.06 34-1.42 � 136 es
AD2 ADl 0.05 ?5 8 0.011 34?.i7 342.32 03> O.li 0.00 L00 0.10 343.06 0.00 343.2d O.SU 0.00 0.00 ;43.?3 0.15 34�.67 0.00 O.IXI OAO 0.00 0.00 343.2� 3�i4.�2 i I.1R r,
ADI OFS 0.04 I i R 0.011 342.R2 342.99 03� 0.11 0.00 LOU 0.09 3�3.23 D.00 34i.49 0.50 0.00 0.00 3�33.�9 0.13 342.91 p.00 0.00 OAO D.00 OAO 34i.�9 34F..13 i _'.64 yea
Conveyance Page 3/7
Sub Area C C*A Sum Tc i(R) I(R) Q(R) Q(D) Pipc Typ. Slope Q(F) V V L Tt °�o d%1�
E3asin (ac) C*A (mio.) (c.f.s.) (c.f.s.) (in.) n (ft.ft.) (pipe (pipe (at (ft.) (min.)
From To 1�umber full) full) Q(R))
OFS AD1 OFS 0.01 0.79 0.01 0.01 6.3 0.82 3.19 0.03 0.04 8 0.011 1.00% 1.43 4.10 3.16 17 0.1 7.00%
AD1 AD2 AD1 0.00 0.90 0.00 0.01 6.4 0.81 3.16 0.05 0.06 8 0.011 1.00% 1.43 4.10 2.50 25 0.2 10.00%
AD2 COl AD2 0.01 0.90 0.01 0.02 6.6 0.80 3.11 0.06 0.08 8 0.011 1.00% 1.43 4.10 2.58 18 0.1 12.00%
CO1 SD2 CO1 0.00 0.00 0.00 0.02 6.7 0.79 3.08 0.06 0.08 8 0.011 1.00% 1.43 4.10 2.55 16 0.1 12.00°0
SD2 SD1 SD2 0.11 0.90 0.10 0.12 6.8 0.78 3.05 0.36 0.47 12 0.011 3.30% 7.67 9.77 5.45 15 0.0 14.00°�
R2 SD1 R2 0.11 0.90 0.10 0.10 6.3 0.82 3.19 0.32 0.41 8 0.011 0.75°/a 1.24 3.55 2.91 35 0.2 35.00°��
SDl SD4(DISCHARGE) SD1 0.01 0.90 0.01 0.23 6.8 0.78 3.04 0.69 0.90 12 0.011 2.00% 5.97 7.60 5.08 17 0.1 23.00"'0
RI SD3 (DISCHARGE) R1 0.23 0.90 0.21 0.21 6.3 0.82 3.19 0.67 0.87 8 0.011 2.00°0 2.03 5.82 5.15 2� 0.1 40.00"0
Projecr. Renton Highlands Library R= l�_�r P(R)= �Q Calcs by: SEF Job No: C131436-01
L��cati��n: Rcnton. 11�:A [).�tc: ��-'��'_f114 Pa�c 1
100-YEAR FLOWS Conveyance Page 4/7
100 ear Backwater An�l sis 1'able �t�„�����;;5c���rr.�.��� ����i i
The difference between the�ater elevation and the rim should be greater than 0.0 feet.
;enton Highlands Library
upstream rim
Location Q 1. Pipe TYP Outlet Inlet Barrel Barrel �'elocitv Excel Critical T��' Friction HGL F.ntrv Enirv Exit OuNet HeadN•ater Inlet Approach Bend Bend Junction Junction Headwater Rim Elev. QK.?
Downstream U stream (cfs) (H I) Diam(in). n Elev Elev Area �'elocitv Head Check Depth Elev I.oss Elev Coei I.oss Lass Control Depth Control Head Coefficient I.oss Loss Loss CoeL Elevation DifferenCe
Q L d n IE IE A V H dc 7'�l' Floss HGL Ke E1rLoss Eloxs Eloc HW%D Elic Hv Kb RI Junc HW Rim HGL
SD3 DISCHaRGE) RI 0.R7 25 8 0.011 338.G0 339.07 0.35 2.50 0.10 L(N� O.M3 33N.1I0 0.(Yt 339.27 0.50 0.05 0.10 i�a..i1 U.70 339.07 -0.10 (7.63 0.07 U.W 0.00 339.38 345.25 S.R� es
SD4 DISCHARGE) SDI O.x6 I' 12 0.011 341.41 3J1.7a 0.79 IJO o.02 LINi 039 34I.?4 O.W 3�12.41 OSO 0.01 0.02 ?J'.4a 0.•3p 3J1.81 -0.02 QI2 0.0o OAI 032 342.43 343.97 LW es
SDI R2 0.41 35 R 0.011 3SIJd 342.0(1 035 I.IR Q(12 I.(1(1 030 3d?.43 0.01 342.�k1 OSO Q01 0.02 3J'.�l' 0.46 342.05 -0.02 0.32 0.01 0.00 0.00 342.46 3�50 2.Ikl es
SDl SD2 O.J? IS 12 0.011 341.?J 342.23 0.79 0.6p 0.01 I.IKI 0.23 la2.J1 U.W 342.i4 Q5p tl.00 0.01 342J5 Q2R 3J2.02 -0.01 406 O.W O.W O.W 342.i4 343.15 IAI es
SD2 COI O.ON 16 S 0.011 342.23 34239 035 0.23 O.W I.uO 0.13 3J2.'4 O.W 342.90 0.50 OAO O.W 342.y(1 0.19 342.36 O.110 0.00 O.W O.W O.W 3J2.90 34J.60 1.70 es
COl AD2 QOS IR R 0.011 35239 342.�i 035 0.23 O.b(1 I.(N1 0.13 3-12.y0 0.00 3J3.06 0.50 0.00 O.W 343.fN� 0.19 342.52 0.00 QUO 0.00 O.W O.W 3J3.06 344.42 1.36 es
AD2 ADl OA6 25 8 QU11 34?.5? 342.3? 0.35 0.17 O.W L00 0.11 3�1}.Oh 0.00 343.24 0.50 0.00 0.110 143.2J 0.17 352.68 0.W 0.(10 0.00 O.W QO(1 3-03.24 344.4 1.13 ves
ADl pFS O.OJ I? 3 0.(111 3J?.S2 �4?.9V 0.35 0.11 O.DO I nU O.W iJ;'J 0.00 3J3.d9 Q50 Q00 O.W )43.Ju 0.13 342.91 O.W O.UO 0.00 O.W Qb(1 343.49 3d6.1 ?.64 ves
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Conveyance Page 5'7
COUGHLIN PORTER LUNDEEN �'
STRUCTURAL CIVIL SEISMIC ENGINEERING
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Project No: C I 3 I 436-01 Client: THA Checked By: BSB Conveyance Page 6/7
801 SECOND AVENUE,SUITE 900 SEATTLE. WA 98104 1 P 206.343.0460 / cplinc.com
COUGHLIN PORTER LUNDEEN
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Project: Renton Highlands Library Designed By: SEF Date: 8-26-2014
Project No: C I 31436-0 I Client: THA Checked By: BSg Conveyance Page 7/7
801 SECOND AVENUE,SUITE 9�0 SEATTLE, WA 98104 ! P 206.343.0460 J cplinc.com
APPENDIX B
OPERATION AND MAINTENANCE MANUAL
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i
COUGHLINPORTERLUNDEEN Renton E�ighlands Library
Renton,4Vashington
MAINTENANCE STANDARDS FOR
PRIVATELY MAINTAINED DRAINAGE FACILITIES
AT PUGET SOUND SKILLS CENTER
NO. 1 — RAIN GARDENS
Maintenance Defect Conditions When Maintenance Results Expected When
Component Is Needed Maintenance Is Pertormed
General Trash & Any trash and debris which exceed 1 Trash and debris cleared
Debris cubic foot per 1,000 square feet(this is from site.
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.
Poisonous Any poisonous or nuisance vegetation No danyer of poison�us
Vegetation which may constitute a hazard to vegetation where County
County personnel or the public. personnel or the public
might normally be.
(Coordination with c� r:-��
King County Health
Department)
Pollution Oil, gasoline, or�ther contaminants of No contaminants preser�t
one gallon or more or any amount found other than a surface film.
that could: 1)cause damage to plant, (Coordination with
animal, or marine life; 2)constitute a fire SeattlelKing County Health
hazard; or 3) be flushed downstream Department)
during rain storms.
Unmowed if facility is located in private residential When mowing is needed,
Grass/ area, mowing is needed when grass grass/ground c�ver should
Ground exceeds 18 inches in height. In �ther be mowed to 2 inches in
Cover areas,the general policy is to make the height. Mowing of
pond site match adjacent ground cover selected higher use areas
and terrain as long as there is no rather than the entire slope
interference with the function of the may be acceptable for
facility. some situations.
Rodent Any evidence of rodent holes if facility is R�dents destroyed and
Holes acting as a dam or berm, or any dam or berm repaired.
evidence of water piping through dam or (Coordination with
berm via rodent holes. Seattle/King County Health
Department)
Insects When insects such as wasps and Insects destroyed or
hornets interFere with maintenance removed from site.
activities.
Tree Tree growth does not allow Trees do not hinder
Growth maintenance access or interferes with maintenance activities.
maintenance activity(i.e., slope Selectively cultivate trees
mowing, silt removal, vactoring, or such as alders for
equipment movements). If trees are not firewood.
interfering with access, leave trees
alone.
COUGHLINPORTERLUNDEEN Renton Highlands Library
13 Renton,Washington
Side Slopes of Erosion Eroded damage over 2 inches deep Slopes should be '
facility where cause of damage is still present stabilized by using
or where there is potential for continued appropriate erosion control ,
erosion. measure(s); e.g., rock
reinforcement, planting of
grass, compaction.
Storage Area Sediment Accumulated sediment that exceeds Sediment cleaned out to
10%of the designed pond depth. designed pond shape and i
depth; pond reseeded if '
necessary to control
erosion.
Emergency Rock Only one layer of rock exists above Replace rocks to design
Overflow/Spill Missing native soil in area five square feet or standards.
way larger, or any exposure of native soil at
the top of out flow path of spillway. Rip- ,
rap on inside slopes need not be
replaced.
Note: Sediment accumulation of more than.25 inches per year may indicate excessive erosion is occurring
upstream of the facility or that cunveyance sysfems are not being properly maintained. The contributing
drainage area should be checked for erosion problems or inadequate maintenance of conveyance systems if
excessive sedimentafion is noted in an infrltration facility.
Check twice a year during first 2 years of operatron;once a year thereafter. Clean manholes/catch basins,
repair damaged rnlets/outlefs, clean trash racks.
NO. 2-CLOSED DETENTION SYSTEMS (VAULTS)
Maintenance Defect Conditions When Maintenance is Results Expected
Component Needed When Maintenance is
Performed
Storage Area Plugged Air One-half of the cross section of a vent is Vents free of debris and
Vents blocked at any point with debris and sediment
sediment
Debris and Accumulated sediment depth exceeds All sediment and debris
Sediment 10%of the diameter of the storage area removed from storage
for'/z length of storage vault or any point area.
depth exceeds 15%�f diameter.
Example: 72-inch storage tank would
require cleaning when sediment reaches
depth of 7 inches for more than '/�length
of tank.
Manhole Cover Not in Cover is missing or only partially in place. Manhole is closed.
Place Any open manhole requires
maintenance.
Locking Mechanism cannot be opened by one Mechanism opens with
Mechanism maintenance person with proper tools. proper tools.
Not Working Bolts into frame have less than Y�inch of
thread (may not apply to self-locking
lids.)
COUGHLINPORTERLUNDEEN Renton Highlands Library
14 Renton,Washington
! I
Cover Difficult One maintenance person cannot remove Cover can be removed
to Remove lid after applying 801bs of lift. Intent is to and reinstalled by one
keep cover from sealing off access to maintenance person.
maintenance. �
Ladder Rungs King County Safety Office and/or Ladder meets design
Unsafe maintenance person judges that ladder standards allows
is unsafe due to missing rungs, maintenance person
misalignment, rust, or cracks. safe access.
Catch Basins See"Catch Basins"Standards No. 4 See"Catch Basins"
Standards No. 4
NO. 3-CONTROL STRUCTURE/FLOW RESTRICTOR
Maintenance Defect Condition When Maintenance is Results Expected
Component Needed When Maintenance is
Performed
General Trash and Distance between debris build-up and All trash and debris
Debris bottom of orifice plate is less than 1-1/2 removed.
(Includes feet.
Sediment)
Structural Structure is not securely attached to Structure securely
Damage manhole wall and outlet pipe structure attached to wall and
should supp�rt at least 1,000 Ibs of up or outlet pipe.
down pressure.
Structure is not in upright position (allow Structure in correct
up to 10%from plumb). position.
Connections to outlet pipe are not Connections to outlet
watertight and show signs of rust. pipe are water tight;
structure repaired or
replaced and works as
designed.
Any holes--other than designed holes--in Structure has no holes
the structure. other than designed
holes.
Cleanout Gate Damaged or Cleanout gate is not watertight or is Gate is watertight and
Missing missing. works as designed.
Maintenance Defect Conditions When Maintenance is Results Expected
Component Needed When Maintenance is
performed
Gate cannot be moved up and down by Gate moves up and
one maintenance person. down easily and is
watertight.
Chain leading to gate is missing or Chain is in place and
damaged. works as designed.
Gate is rusted over 50% of its surface Gate is repaired or
area. replaced to meet design
standards..
COUGHLINPORTERLUNDEEN Renton Highlands Library
15 Renton,Washington
Orifice Plate Damaged or Control device is not working properly due Plate is in place and
Missing to missing,out of place, or bent orifice w�rks as designed.
plate.
Obstructions Any trash,debris, sediment, or vegetation Plate is free of all
blocking the plate. obstructions and works
as designed.
Overflow Pipe Obstructions Any trash or debris blocking (or having the Pipe is free of all
potential of blocking)the overflow pipe. obstructions and works
as designed.
Manhole See"Closed Detention Systems" See"Closed Detention
Standards No. 2 Systems'Standards No.
2
Catch Basin See"Catch Basin�" Standards No. 4 See`Catch Basins" '
Standards No.4
NO. 4-CATCH BASINS
Maintenance Defect Conditions When Maintenance is Results Expected
Component Needed When Maintenance is
performed
General Trash & Trash or debris of more than 1/2 cubic No Trash or debris '
Debris foot which is located immediately in front located immediately in
(Includes of the catch basin opening or is blocking front of catch basin
Sediment) capacity of the basin by more than 10% opening.
Trash or debris(in the basin)that No trash or debris in the
exceeds 1/3 the depth from the bottom of catch basin.
basin to invert the lowest pipe into or out
of the basin.
Trash or debris in any inlet or outlet pipe Inlet and outlet pipes
blocking more than 1/3 of its height. free of trash or debris.
Dead animals or vegetation that could No dead animals or
generate odors that could cause vegetation present within
complaints or dangerous gases (e.g., the catch basin.
methane).
Deposits of garbage exceeding 1 cubic No condition present
foot in volume which would attract or
support the breeding of
insects or rodents.
Structure Corner of frame extends more than 3/4 Frame is even with curb.
Damage to inch past curb face into the street(If
Frame and/or applicable).
Top Slab
COUGHLINPORTERLUNDEEN Renton Highlands Library
16 Renton,Washington
II
-�
Top slab has holes larger than 2 square Top slab is free of holes
inches or cracks wider than 1/4 inch and cracks.
(intent is to make sure all material is
running into basin).
Frame not sitting flush on top slab, i.e., Frame is sitting flush on
separation of more than 3!4 inch of the top slab.
frame from the top slab.
NO. 4-CATCH BASINS (CONTlNUED)
Maintenance Defect Condition When Maintenance is Results Expected I
Components Needed When Maintenance is �
Performed.
Cracks in Cracks wider than 1/2 inch and longer Basin replaced or
Basin Walls/ than 3 feet, any evidence of soil repaired to design
Bottom pa�ticles entering catch basin through standards.
cracks, or maintenance person judges
that structure is unsound.
Cracks wider than 1/2 inch and longer No cracks more than
than 1 foot at the joint of any inleU outlet 1/4 inch wide at the joint
pipe or any evidence of soil particles of inleUoutlet pipe.
entering catch basin through cracks. ,
SedimenU Basin has settled more than 1 inch or Basin replaced or II
Misalignment has rotated more than 2 inches out of repaired to design '
alignment. standards.
Fire Hazard Presence of chemicals such as natural No flammable
gas,oil and gasoline. chemicals present.
Vegetation Vegetation growing across and blocking No vegetation blocking
more than 10%of the basin opening. opening to basin.
Vegetation growing in inleUoutlet pipe No vegetation or root
joints that is more than six inches tall growth present.
and less than six inches apart.
Pollution Nonflammable chemicals of more than No pollution present
1/2 cubic foot per three feet of basin other than surface film.
length.
Catch Basin Cover Not in Cover is missing or only partially in Catch basin cover is
Cover Place place.Any open catch basin requires closed
maintenance.
Locking Mechanism cannot be opened by on Mechanism opens with
Mechanism maintenance person with proper tools. proper tools.
Not Working Bolts into frame have less than 1/2 inch
of thread.
Cover Difficult One maintenance person cannot Cover can be removed
to Remove remove lid after applying 80 Ibs. of lift; by one maintenance
intent is keep cover from sealing off person.
access to maintenance.
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17 Renton,Washington
Ladder Ladder Rungs Ladder is unsafe due to missing rungs, Ladder meets design �
Unsafe misalignment, rust, cracks, or sharp standards and allows
edges. maintenance person ,
safe access. �
Metal Grates Grate with opening wider than 7/8 inch. Grate opening meets �
(If Applicable) design standards.
Trash and Trash and debris that is blocking more Grate free of trash and '
Debris than 20%of grate surface. debris.
Damaged or Grate missing or broken member(s)of Grate is in place and
Missing. the grate. meets design
standards.
NO. 5 DEBRIS BAK�2IERS (E.G., TRASH RACKS)
Maintenance Defect Condition When Maintenance is Results Expected
Components Needed When Maintenance is
Performed.
General Trash and Trash or debris that is plugging more Barrier clear to receive
Debris than 20%of the openings in the barrier. capacity flow.
Metal Damaged/ Bars are bent out of shape more than 3 Bars in place with no '
Missing Bars. inches. bends more than 3/4
inch.
Bars are missing or entire barrier Bars in place according '
missing. to design.
Bars are loose and rust is causing 50% Repair or replace barrier
deterioration to any part of barrier. to design standards.
NO. 6- ENERGY DISSIPATERS
Maintenance Defect Conditions When Maintenance is Results Expected
Components Needed When Maintenance is
Performed.
Manhole/ Worn or Structure dissipating flow deteriorates Replace structure to
Chamber Damaged to 1/2 or original size or any design standards.
Post. Baffles, concentrated worn spot exceeding
Side of one square foot which would make
Chamber structure unsound.
Other Defects See"Catch Basins" Standard No. 4 See"Catch Basins"
Standard No. 4
COUGHLINPORTERLUNDEEN Renton Highlands Library
18 Renton,Washington
NO. 7 - FENCING
Maintenance Defect Conditions When Maintenance is Results Expected
Components Needed When Maintenance is
Performed
General Missing or Any defect in the fence that permits Parts in place to provide
Broken Parts easy entry to a facility. adequate securiry.
Erosion Erosion more than 4 inches high and No opening under the
12-18 inches wide permitting an fence that exceeds 4
opening under a fence. inches in height.
Wire Fences Damaged Post out of plumb more than 6 inches. Post plumb to within 1-
Parts 1/2 inches.
Top rails bent more than 6 inches. Top rail free of bends
greater than 1 inch.
Any part of fence (including post, top Fence is aligned and
rails)more than 1 foot out of design meets design standards.
alignment.
Missing or loose tension wire. Tension wire in place
and holding fabric.
Extension arm missing, broken, or Extension arm in place
bent out of shape more than 1 1/2 with no bends larger
inches. than 3/4 inch.
Deteriorated Part or parts that have a rusting or Structurally adequate
Paint or scaling condition that has affected posts or parts with a
Protective structural adequacy. uniform protective
Coating coating. '
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19 Renton,Washington
NO. 8 -GATES
Maintenance Defect Conditions When Maintenance is Results Expected
Component Needed When Maintenance is
Performed
General Damaged or Missing gate or locking devices. Gates and Locking
Missing devices in place.
Members
Broken or missing hinges such that Hinges intact and lubed.
gate cannot be easily opened and Gate is working freely.
closed by a maintenance person.
Gate is out of plumb more than 6 Gate is aligned and
inches and more than 1 foot out of vertical.
design alignment.
Missing stretcher bar, stretcher Stretcher bar, bands
bands, and ties. and ties in place.
Openings in See"Fencing"Standard No. 7 See"Fencing"Standard
Fabric No. 7
NO. 9 -CONVEYANCE SYSTEMS (PIPES 8� DITCHES)
Maintenance Defect Conditions When Maintenance is Results Expected
Component Needed When Maintenance is
Performed �
Pipes Sediment& Accumulated sediment that exceeds Pipe cleaned of all
Debris 20%of the diameter of the pipe. sediment and debris.
Vegetation Vegetation that reduces free All vegetation removed
movement of water through pipes. so water flows freely
through pipes.
Damaged Protective coating is damaged; rust is Pipe repaired or
causing more than 50%deterioration replaced.
to any part of pipe.
Any dent that decreases the cross Pipe repaired or
section area of pipe by more than replaced.
20%.
Open Ditches Trash & Debris Trash and debris exceeds 1 cubic foot Trash and debris
per 1,000 square feet of ditch and cleared from ditches.
slopes.
Sediment Accumulated sediment that exceeds Ditch cleaned/flushed of
20 %of the design depth. all sediment and debris
so that it matches
design.
Vegetation Vegetation that reduces free Water flows freely
movement of water through ditches. through ditches.
Erosion See"Rain gardens"Standard No. 1 See"Rain gardens"
Damage to Standard No. 1
Slopes
COUGHLINPORTERLUNDEEN Renton Highlands Library
2� Renton,Washington
Rock Lining Maintenance person can see native Replace rocks to design
Out of Place or soil beneath the rock lining. standards.
Missing (If
Applicable).
Catch Basins See"Catch Basins: Standard No.4 See"Catch Basins"
Standard No.4
Debris See"Debris Barriers"Standard No.5 See"Debris Barriers"
Barriers (e.g., Standard No. 5
Trash Rack)
� NO. 10-GROUNDS (LANDSCAPING)
Maintenance Defect Conditions When Maintenance is Results Expected
Component Needed When Maintenance is
Performed
General Weeds Weeds growing in more than 20%of Weeds present in le��
(Nonpoisonous the landscaped area (trees and shrubs than 5% of the
) only). landscaped area.
Safety Hazard Any presence of poison ivy or other No poisonous vegetation
poisonous vegetation. present in landscaped
area.
Trash or Litter Paper, cans, bottles, totaling more than Area clear of litter.
1 cubic foot within a landscaped area
(trees and shrubs only)of 1,000 square
feet.
Trees and Damaged Limbs or parts of trees or shrubs that Trees and shrubs with
Shrubs are split or broken which affect more less than 5% of total
than 25%of the total foliage of the tree foliage with split or
or shrub. broken limbs.
Trees or shrubs that have been blown Tree or shrub in place
down or knocked over. free of injury.
Trees or shrubs which are not Tree or shrub in place
adequately supported or are leaning and adequately
over, causing exposure of the roots. supported; remove any
dead or diseased trees.
COUGHLINPORTERLUNDEEN Renton Highlands Library
21 Renton,Washington
NO. 11 -ACCESS ROADS/EASEMENTS
Maintenanc Defect Condition When Maintenance is Results Expected
e Needed When Maintenance is
Component Performed
General Trash and Trash and debris exceeds 1 cubic Roadway free of debris
Debris foot per 1,000 square feet i.e., trash which could damage
and debris would fill up one tires.
standards size garbage can.
Blocked Debris which could damage vehicle Roadway free of debris
Roadway tires (glass or metal). which could damage
ti res.
Any obstruction which reduces Roadway overhead
clearance above road surface to clear to 14 feet high.
less tha~; 14 feet.
Any obstruction restricting the Obstruction removed
access to a 10 to 12 foot width for a to allow at least a 12
distance of more than 12 feet or foot access. ,
any point restricting access to less '
than a 10 foot width.
Road Settlement, When any surface defect exceeds 6 Road surface uniformly
Surface Potholes, inches in depth and 6 square feet in smooth with no
Mush Spots, area. In general, any surface defect evidence of settlement,
Ruts which hinders or prevents potholes, mush spots,
maintenance access. or ruts.
Vegetation in Weeds growing in the road surface Road surface free of
Road SurFace that are more than 6 inches tall and weeds taller than 2
less than 6 inches tall and less than inches.
6 inches apart within a 400-square
foot area.
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22 Renton,Washington
NO. 12-WATER QUALITY FACILITIES
A.)Cartridge Filter Vault
Maintenan Defect or Condition When Maintenance Recommended
ce Problem is Needed Maintenance to
Componen Correct Problem
t
Below Sediment Sediment depth exceeds 0.25- No sediment
Ground Accumulatio inches. deposits which
Vault n on Media. would impede
permeability of the
compost media.
Sediment Sediment depth exceeds 6- No sediment
Accumulatio inches in first chamber. deposits in vault
n in Vault bottom of first
chamber.
Trash/ Trash and debris accumulated Trash and debris
Debris on compost filter bed. removed from the �
Accumulatio compost filter bed.
n
Sediment in When drain pipes, clean-outs, Remove the
Drain become full with sediment and/ accumulated ,
Pipes/Clean or debris. material from the
-Outs facilities.
Below Compost Drawdown of water through the Replace media
Ground Media media takes longer than 1 hour, cartridges.
Cartridge and/ or overflow occurs
type frequently.
Short Flows do not properly enter filter Replace filter
Circuiting cartridges. cartridges.
Damaged Any part of the pipes that are Pipe repaired and/
Pipes crushed, damaged due to or replaced.
corrosion and/ or settlement.
' Access Cover cannot be opened, one Cover repaired to
Cover person cannot open the cover, proper working
Damaged/ corrosion/deformation of cover. specifications or
Not Working replaced.
Vault Cracks wider than 1/2-inch and Vault replaced or
Structure any evidence of soil particles repaired to design
Includes entering the structure through specifications.
Cracks in the cracks, or maintenance/
Wall, inspection personnel
COUGHLINPORTERLUNDEEN Renton Highlands Library
23 Renton,Washington
Bottom, determines that the vault is not
Damage to structurally sound.
Frame and/
or Top Slab
� Cracks wider than 1/2-inch at No cracks more
the joint of any inlet/outlet pipe than 1/4-inch wide at
or any evidence of soil particles the joint of the inlet/
entering the vault through the outlet pipe.
walls.
Baffles Baffles corroding, cracking Repair or replace
warping, and/ or showing signs baffles to
of failure as determined by specification.
maintenance/ inspection
person.
Access Ladder is corroded or Ladder replaced or ���
Ladder deteriorated, not functioning repaired and meets
Damaged properly, missing rungs, cracks, specifications, and is
and misaligned. safe to use as I
determined by
inspection
personnel.
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