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Technical Information Report (TIR)
Renton Senior Housing
RJ Development
Preliminary
February 2018
SCJ Alliance February 2018
Technical Information Report
Project Information
Project: Renton Senior Housing
Prepared for: RJ Development
Reviewing Agency
Jurisdiction: City of Renton
Project Representative
Prepared by: SCJ Alliance
8730 Tallon Lane NE, Suite 200
Lacey, WA 98516
360.352.1465
scjalliance.com
Contact: Whitney Holm, PE
Project Reference: SCJ #2386.03
Path: N:\Projects\2386 RJ Development\2386.03 Renton Senior
Housing\Phase Number\Design\Storm\Technical Information Report.docx
Ross Jarvis, PE
SCJ Alliance February 2018
Page i
TABLE OF CONTENTS
1. Project Overview ........................................................................................................ 2
1.1 Project Overview ................................................................................................................... 2
1.2 Predeveloped Site Conditions ............................................................................................... 3
1.3 Soils ........................................................................................................................................ 3
2. Conditions and Requirements Summary ..................................................................... 3
3. Offsite Analysis .......................................................................................................... 5
3.1 Downstream Analysis ............................................................................................................ 5
3.2 Upstream Analysis ................................................................................................................. 6
3.3 Resource Review ................................................................................................................... 6
3.4 Field investigation ................................................................................................................. 6
3.5 Drainage System Description and Problem Descriptions ...................................................... 6
4. Flow Control, Low Impact Development (LID) and Water Quality Facility Analysis and
Design ................................................................................................................................ 6
4.1 Existing Site Hydrology .......................................................................................................... 6
4.2 Developed Site Hydrology ..................................................................................................... 6
4.3 Performance Standards ......................................................................................................... 7
4.4 On-Site BMPs ......................................................................................................................... 7
4.5 Flow Control System .............................................................................................................. 8
4.6 Water Quality System ............................................................................................................ 8
5. Conveyance System Analysis and Design ..................................................................... 8
6. Special Reports and Studies ........................................................................................ 9
7. Other Permits ............................................................................................................. 9
8. CSWPP Analysis and Design ........................................................................................ 9
8.1 ESC Plan Analysis and Design ................................................................................................ 9
8.2 SWPPS Plan Design .............................................................................................................. 10
9. Bond Quantities, Facility Summaries, and Declaration of Covenant ........................... 11
10. Operations and Maintenance Manual ....................................................................... 11
SCJ Alliance February 2018
Page ii
LIST OF APPENDICES
Appendix A: Determination of Minimum Requirements Worksheets
Appendix B: Site Vicinity Maps
Appendix C: Basin Map Exhibits
Appendix D: Off-Site Analysis
Appendix E: Design Calculations and Computations
Appendix F: Stormwater Plan Sheets
Appendix G: Geotechnical Report
Appendix H: Construction SWPPP
Appendix I: Worksheets
Appendix J: Operations and Maintenance Manual
Appendix K: Declaration of Covenant
Renton Senior Housing 2 of 11 Technical Information Report
1. PROJECT OVERVIEW
The following report was prepared for the proposed Senior Housing Facility and parking lot in Renton. This report
was prepared to comply with the minimum technical standards and requirements that are set forth in the 2016
City of Renton Surface Water Design Manual (Manual).
1.1 PROJECT OVERVIEW
Project Proponent: RJ Development, LLC
Parcel Numbers: 312305-9067, 312305-9094
Total Parcel Area: 4.75 acres
Current Zoning: Commercial
Required Permits: Utility, building, grading, paving, etc.
Site Address: 4500 Talbot Road SE
The proposed Renton Senior Housing Facility site is located on two parcels adding up to 4.75 acres. The
project is located east of the intersection between Talbot Road South and South 45th Place in Renton,
Washington. The site is bordered to the north and south by existing commercial and residential
development, to the east by undeveloped land, and to the west by Talbot Road South. A site vicinity
map of the proposed project location is enclosed herein as Appendix B. The proposed construction
includes the Senior Housing Facility building and pool house as well as the associated parking, utilities,
frontage improvements, and stormwater improvements, disturbing approximately 3.55 acres.
Specifically, the proposed site improvements/construction activities for this project include the
following:
• Site preparation, grading, and erosion control activities
• Construction of Senior Housing Facility and associated parking
• Construction/installation of on-site water quality and flow control facilities
• Extension of available utilities (i.e., water, sewer, etc.)
Table 1 describes the land use of the proposed drainage basin. See the Existing and Proposed Drainage
Basin Exhibits in Appendix C.
Renton Senior Housing 3 of 11 Technical Information Report
Table 1: On-site Land Type Designations Summary Section
LAND TYPE DESIGNATIONS AREA (ACRES) % OF TOTAL AREA
Total Site Area 4.75 100
Existing Pervious Surface 4.75 100
Existing Impervious Surface 0 0
Drainage Basin Areas 4.75 100
Proposed Pervious Surface 1.00 18.7
Undisturbed Pervious 1.05 25.3
Proposed Pavement Surface 1.22 25.7
Proposed Roof Surface 1.03 20.8
Proposed Sidewalk Surface 0.45 9.5
A TIR worksheet is included in Appendix I.
1.2 PREDEVELOPED SITE CONDITIONS
The site is heavily forested. A single-family residence once occupied a small portion of the site area but
appears to have been demolished and removed from the property. The existing access road, however,
still remains. Topography generally ascends gently to the east. The eastern site area maintains a general
gradient of 30 percent while the central and western site area maintains a flatter gradient, on the order
of approximately 10 percent. There are no current drainage flow control facilities on the site.
1.3 SOILS
According to the Geotechnical Study completed by Earth Solutions NW LLC (ESNW) in August 2017, the
soils on-site contain topsoil in the upper 12 to 18 inches and the native soil below consists of silty sand.
A geologic map that is referenced in the study identifies Ground Moraine Deposits across the site and
surrounding areas. Groundwater seepage was identified in a few test pits two feet below existing grade
when they were dug in November 2017. It is believed groundwater is likely to be encountered during
construction activities. They also determined, in general, the native soil they encountered is not suitable
for infiltration. Due to no infiltration in the native soil and high groundwater, the StormCapture system
will have a solid bottom.
2. CONDITIONS AND REQUIREMENTS SUMMARY
A Full Drainage Review is required for the project, according to the Flow Chart for Determining Type of
Drainage Review Required. The flow chart is attached in Appendix A. According to the Manual, a project
that requires a Full Drainage Review is also required to address all nine core requirements and all six
special requirements.
Renton Senior Housing 4 of 11 Technical Information Report
Summary of Compliance On-Site
The stormwater design complies with all nine core requirements and all six special requirements as
follows:
Core Requirement #1 – Discharge at the Natural Location – On-site generated stormwater runoff will be
detained and released to the City’s stormwater conveyance system. Currently, the runoff either
infiltrates on-site or sheet flows to the City’s stormwater system along Talbot Road.
Core Requirement #2 – Offsite Analysis – A Level 1 upstream and downstream analysis has been
completed and can be found in Section 3 of this Report.
Core Requirement #3 – Flow Control – A stormwater detention vault will be constructed as a part of this
project. On-site stormwater will be released at the predeveloped flow rates.
Core Requirement #4 – Conveyance System – The on-site stormwater conveyance system will be
designed to route the 25-year peak flow event.
Core Requirement #5 – Erosion and Sediment Control – A Construction Stormwater Pollution Prevention
(CSWPP) Plan has been completed and can be found in Section 8.
Core Requirement #6 – Maintenance and Operations – An Operation and Maintenance Manual can be
found in Section 10 of the Report. The owner is aware they are responsible for operating and
maintaining the stormwater system on-site.
Core Requirement #7 – Financial Guarantees and Liability – The owner will maintain liability insurance
and post with the City of Renton a bond, assignment of funds, or certified check.
Core Requirement #8 – Water Quality – A Modular Wetland System will be used to fulfill the enhance
treatment requirement.
Core Requirement #9 – On-site BMPs – BMPs will be used where feasible. Due to steep slopes and
minimal to no infiltration, many of the BMPs are not feasible. See Section 4.4 of this report for further
discussion.
Special Requirement #1 – Other Adopted Area-Specific Requirements – No additional requirements are
known at this time.
Special Requirement #2 – Flood Hazard Area Delineation – The proposed project is not located in or
adjacent to a flood hazard area. See the FEMA flood map attached in Appendix C. This Special
Requirement is not applicable.
Special Requirement #3 – Flood Protection Facilities – The proposed project does not rely on an existing
flood protection facility. This Special Requirement is not applicable.
Special Requirement #4 – Source Control – Water quality source controls will be installed in accordance
with the King County Stormwater Pollution Prevent Manual.
Renton Senior Housing 5 of 11 Technical Information Report
Special Requirement #5 – Oil Control – The project is not considered a high-use site; therefore, oil
control is not required.
Special Requirement #6 – Aquifer Protection Area – The project is not located in an Aquifer Protection
Area. See the Groundwater Protection Areas Map in Appendix B.
3. OFFSITE ANALYSIS
3.1 DOWNSTREAM ANALYSIS
A Level 1 Analysis was completed for this project. Stormwater from the project site will be detained
and released at the predeveloped rate to an existing stormwater system on Talbot Road. The existing
system conveys the water to the northwest into Panther Creek. The existing system conveys the water
down Talbot Road, west on South 43rd Street, through the Valley Medical Center Complex, and then is
discharged into Panther Creek. The map below shows the downstream path and the location where it
is discharged. Panther Creek is considered the natural discharge location and adverse effects are not
anticipated. No improvements to the conveyance system in Talbot Road are anticipated. Offsite
drainage courses will not be altered. Stormwater will be released at its predeveloped rates at the
natural discharge location. Consequently, downstream impacts are not anticipated. Additional site
maps with contours can be found in Appendix F.
Figure 1: Downstream Analysis
Renton Senior Housing 6 of 11 Technical Information Report
3.2 UPSTREAM ANALYSIS
There is no foreseen offsite run-on from the adjacent roadway or parcels that will be tributary to the
proposed stormwater system.
3.3 RESOURCE REVIEW
Flood Hazard Zone
The flood hazard areas within this portion of Renton, Washington, are delineated on the Federal
Emergency Mapping Agency (FEMA) National Flood Insurance Program – Flood Insurance Rate Map
(FIRM) No 53033C0979F, revised May 16, 1995. The project site does not lie in a Flood Zone. See
Appendix C for a copy of the FEMA map.
Critical Areas
According to City of Renton’s GIS site, there are critical areas on the eastern portion of the site. There is
high erosion hazard, steep slopes, landslide potential, and regulated slopes. The critical areas located on
the project parcels will remain undeveloped.
The closest wetland to the site is upstream about 700 feet away.
3.4 FIELD INVESTIGATION
An in-depth Inspection will be completed prior to the final submittal.
3.5 DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS
An Offsite Analysis Drainage System Table is attached in Appendix D.
4. FLOW CONTROL, LOW IMPACT DEVELOPMENT (LID) AND WATER
QUALITY FACILITY ANALYSIS AND DESIGN
4.1 EXISTING SITE HYDROLOGY
Currently, on-site generated stormwater that does not infiltrate directly in the soils flows offsite towards
Talbot Road. There are no current drainage flow control facilities on the site. The geotechnical report
classified the site soils as type C.
See attached Existing Drainage Basin Exhibit in Appendix C.
4.2 DEVELOPED SITE HYDROLOGY
The developed site hydrology was modeled using the areas in Table 1 of this report. Refer to Appendix F
for the stormwater plan sheets and the full proposed stormwater design.
Renton Senior Housing 7 of 11 Technical Information Report
4.3 PERFORMANCE STANDARDS
According to Section 1.2.3.1 in the Manual and the City of Renton Flow Control Application Map,
attached in Appendix B, the site must meet the Flow Control Duration Standard – Matching Forested
requirements. From Table 1.2.3.A the project must apply the Flow Control Duration Standard, which
matched the flow duration of predeveloped rates for forested site conditions over the range of flows
extending from 50% of two years up to the full 50-year flow and matches peaks for the two- and ten-
year return periods. See Section 4.4 of this section for the design of the flow control system.
According to Section 1.2.4.1 of the Manual, this project requires the new pipe systems to be able to
convey and contain the 25-year peak flows. See Section 5 for the conveyance system analysis.
The project is a commercial site and according to Section 1.2.8.1.A of the Manual enhanced treatment is
required. No additional source control or oil control is required. See part 4.5 of this section for the
design of the water quality system.
4.4 ON-SITE BMPS
Using Appendix C of the Manual, specific BMPs were determined feasible or infeasible for this project. A
geotechnical report was completed in August 2017. It was determined in the report that the site is not
suitable for infiltration. Groundwater seepage was also encountered in areas two feet below existing
ground. See below for more in-depth infeasibility discussion.
Section C.1.3.2 of the Manual lays out Large Lot BMP Requirements.
• Requirement #1: Full Dispersion (Section C2.1) – Per the Infeasibility Criteria in Section C2.1,
Full dispersion is not considered feasible where the stormwater discharge would be towards
slopes greater than 15%. Dispersion on the project parcel would only be possible to the east
however, steep slopes and retaining walls make dispersion onto the native vegetation infeasible.
• Requirement #2: Full Infiltration of Roof Runoff (Section C2.2) – Per the Infeasibility Criteria in
Section C2.2, Full infiltration is not considered feasible where geotechnical evaluation deems
infiltration not possible. Per the geotechnical report completed in August 2017 (See Appendix G)
the site was determined not to be suitable for infiltration. It is also important to note that steep
slopes and high groundwater also make infiltration not feasible for this project.
• Requirement #3: Full Infiltration (Section C2.2), Limited Infiltration (Section C2.3),
Bioretention (Section C2.6), Permeable Pavement (Section C2.7) – Per the Infeasibility Criteria
in Sections C2.2, C2.3, C2.6, and C2.7, none of these BMPs are feasible for the same reasons
listed above. Per the geotechnical report and the steep slopes on-site infiltration is not feasible
for this project.
• Requirement #4: Basic Dispersion (Section C2.4) – Per the Infeasiblity Criteria in Section C2.4,
basic dispersion is not feasible for the project due to the steep slopes and the geotechnical
report (see above).
• Requirement #5: On-Site BMP Application Rates – Per Table C1.3.A, the project site has
approximately 55% proposed impervious surface coverage, and therefore requires that 35% of
the target impervious surface be mitigated by on-site BMPs. Approximately 1.05 acres of the
Renton Senior Housing 8 of 11 Technical Information Report
project site will be considered undisturbed, and will remain forested with native vegetation. Due
to the steep slopes (over 15%) of the undisturbed portion of the project site, none of this area
can be used for the reduced impervious surface credit (Section C2.9), Native Growth Retention
Credit (Section C2.10), and the Tree Retention Credit (Section C2.14). Due to the retaining walls
surrounding the project, no stormwater runoff will be allowed to flow onto the native
vegetation or the steep slopes, therefore making these credits infeasible.
• Requirement #6 – The soil moisture holding capacity of the new pervious surfaces will be
protected in accordance with the soil amendment BMP as detailed in Section C2.13. All the
areas that are being preserved will be protected from compaction during construction.
• Requirement #7 – The proposed roof downspouts will be connected into the stormwater
detention vault on-site, therefore not connecting into the local drainage system and not
requiring a perforated pipe connection per Section C2.11.
4.5 FLOW CONTROL SYSTEM
One (1) on-site detention vault will be constructed as a part of the site improvements for this project. The
stormwater detention vault will be built using StormCapture units. The total number of units required for
this project is 91. Each module is 8 ft by 16 ft by 8 ft deep. The amount of storage is limited to 7 ft by 15
ft by 7 ft. The modules can be placed in any configuration. See the stormwater plans in Appendix F. The
vault has been designed to release stormwater off-site at the predeveloped flow rates of 50% of the two-
year peak flow up to the 50-year peak flow and matches peaks for the two- and ten-year return periods.
(See Appendix E for predeveloped and post developed flow rates). WWHM2012 was used to model the
flow control for the proposed stormwater system. WWHM is an approved continuous flow simulation
method. The vault will be constructed with a flow control structure, which will include a 1.2-inch diameter
orifice at the bottom of the structure, a 1.9-inch diameter orifice 4 feet from the bottom of the structure,
a 1.2-inch diameter orifice 4.5 feet from the bottom of the structure, and an 18-inch diameter riser at 6
feet from the bottom of the structure, which allows one foot of freeboard. It is important to note that the
StormCapture units will have a solid bottom due to the project site not beign suitable for infiltration as
well as the high groundwater, as noted in the geotechnical report.
4.6 WATER QUALITY SYSTEM
A Modular Wetland System will be used to treat the roadway and parking runoff. Using WWHM, an off-
line flow of 0.12 cfs needs to be treated. The MWS-L-4-13 can treat up to 0.144 cfs. The modular
wetland has an internal bypass structure, so no additional structure is required to be able to use the off-
line flow rate. The Modular Wetland is placed upstream of the underground vault. See the stormwater
plans in Appendix F.
5. CONVEYANCE SYSTEM ANALYSIS AND DESIGN
The total runoff for all of the pollution-generating impervious surfaces on site is 1.11 cfs during the 100-
year storm. The capacity of a 12-inch PVC pipe sloped at 0.5% is 3.27 cfs. Because the roof area does not
need to be treated, it will be collected through downspouts and discharged directly into the vault. See
Appendix E for design calculations.
Renton Senior Housing 9 of 11 Technical Information Report
6. SPECIAL REPORTS AND STUDIES
A geotechnical report was finalized by ESNW on August 3, 2017, and is enclosed herein as Appendix G. A
SEPA checklist will be submitted by the Applicant.
7. OTHER PERMITS
Utility, grading, and building permits may need to be secured prior to beginning construction activities.
Construction Stormwater General Permit (NPDES) from the Department of Ecology (DOE) is also
required.
8. CSWPP ANALYSIS AND DESIGN
8.1 ESC PLAN ANALYSIS AND DESIGN
The site was designed with the Erosion and Sediment Control Standards in mind. Each measure is
described below and how the project will address the issue.
1. Clearing Limits: Prior to site clearing or grading, areas to remain undisturbed during project
construction will be delineated on the project’s ESC plan and physically marked on the project site.
2. Cover Measures: Temporary and permanent cover measures shall be provided when necessary to
protect disturbed areas.
3. Perimeter Protection: Perimeter protection to filter sediment from sheet flow shall be provided
downstream of all disturbed areas prior to upslope grading.
4. Traffic Area Stabilization: Unsurfaced entrances, roads, and parking areas used by construction traffic
shall be stabilized to minimize erosion and tracking of sediment offsite.
5. Sediment Retention: Surface water collected from all disturbed areas of the site shall be routed
through a sediment pond or trap prior to release from the site, except those areas at the perimeter of
the site small enough to be treated solely with perimeter protection. Sediment retention facilities shall
be installed prior to grading any contributing area.
6. Surface Water Collection: Surface water collection measures (e.g., ditches, berms, etc.) shall be
installed to intercept all surface water from disturbed areas, convey it to a sediment pond or trap, and
discharge it downstream of any disturbed areas. Areas at the perimeter of the site, which are small
enough to be treated solely with perimeter protection, do not require surface water collection.
Significant sources of upstream surface water that drain onto disturbed areas shall be intercepted and
conveyed to a stabilized discharge point downstream of the disturbed areas. Surface water collection
measures shall be installed concurrently with or immediately following rough grading and shall be
designed, constructed, and stabilized as needed to minimize erosion.
Renton Senior Housing 10 of 11 Technical Information Report
7. Dewatering Control: The water resulting from construction site dewatering activities must be treated
prior to discharge or disposed of as specified.
8. Dust Control: Preventative measures to minimize wind transport of soil shall be implemented when a
traffic hazard may be created or when sediment transported by wind is likely to be deposited in water
resources.
9. Flow Control: Surface water from disturbed areas must be routed through the project’s onsite flow
control facility or other provisions must be made to prevent increases in the existing site conditions two-
year and ten-year runoff peaks discharging from the project site during construction (flow control
facility, runoff treatment facility, and on-site BMP areas [existing or proposed] shall not be used for this
purpose).
10. Control Pollutants: Stormwater pollution prevention (SWPPS) measures are required to prevent,
reduce, or eliminate the discharge of pollutants to onsite or adjacent stormwater systems or
watercourses from construction-related activities such as materials delivery and storage, on-site
equipment fueling and maintenance, demolition of existing buildings and disposition of demolition
materials and other waste, and concrete handling, washout and disposal. Section D.2.2 of the Manual
describes BMPs specific to this purpose; additionally, several of the ESC BMPs described herein are
applicable.
11. Protect Existing and Proposed Stormwater Facilities and On-site BMPs: Sedimentation and soil
compaction reduce the infiltration capacity of native and engineered soils. Protection measures shall be
applied/installed and maintained so as to prevent adverse impacts to existing stormwater facilities and
on-site BMPs and areas of proposed stormwater facilities and on-site BMPs for the project. Adverse
impacts can prompt the requirement to restore or replace affected stormwater facilities and on-site
BMPs.
12. Maintain Protective BMPs: Protection measures shall be maintained to ensure continued
performance of their intended function, to prevent adverse impacts to existing BMPs/facilities and areas
of proposed BMPs/facilities, and protect other disturbed areas of the project.
13. Manage the Project: Coordination and timing of site development activities relative to ESC concerns
and timely inspection, maintenance, and update of protective measures are necessary to effectively
manage the project and ensure the success of protective ESC and SWPPS design and implementation.
See Appendix D of the Manual for further discussion of Erosion and Sediment Control.
The steep slopes on site will remain undisturbed. Where retaining walls are constructed, footing drains
will be installed to help reduce erosion problems.
8.2 SWPPS PLAN DESIGN
A site-specific Construction Stormwater Pollution Prevention Plan is enclosed herein as Appendix H.
Renton Senior Housing 11 of 11 Technical Information Report
9. BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF
COVENANT
A Bond Quantities Worksheet, facility summaries, and declaration of covenant(s) for privately
maintained flow control facilities is enclosed herein as Appendix H.
10. OPERATIONS AND MAINTENANCE MANUAL
A site-specific Operations and Maintenance Manual is enclosed herein as Appendix J.
APPENDIX A
DETERMINATION OF MINIMUM REQUIREMENTS WORKSHEETS
RJ Development
Ross Jarvis, PE
SCJ Alliance
(360) 352-1465
Renton Senior Housing
23 N
5 E
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12/26/17
12/26/17
Black River Drainage Basin
Ground Moraine Deposits 5%-30%Yes in parts
APPENDIX B
SITE VICINITY MAP
PROJECT LOCATION
PROJECT LOCATION
PROJECT LOCATION
APPENDIX C
BASIN MAP EXHIBITS
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PROPOSED STORMWATER BASIN EXISTING STORMWATER BASIN SP-01W, HOLM 2SCALE IN FEET03060
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JOB NO:DRAWING FILE NO:DATE:DESIGNER:BY DATE REVISIONS DRAWN BY:SHEET TITLE:OFDRAWING NO:SHEET NO:PROJECT NAME:SEAL:APPROVED BY:RENTON SENIOR HOUSING RENTON, WA K. MELVIN R. JARVIS NOVEMBER, 2017 2386.03 28730 TALLON LANE NE, SUITE 200, LACEY, WA 98516 P: 360-352-1465 F: 360-352-1509 SCJALLIANCE.COM
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JOB NO:DRAWING FILE NO:DATE:DESIGNER:BY DATE REVISIONS DRAWN BY:SHEET TITLE:OFDRAWING NO:SHEET NO:PROJECT NAME:SEAL:APPROVED BY:RENTON SENIOR HOUSING RENTON, WA K. MELVIN R. JARVIS FEBRUARY, 2018 2386.03 28730 TALLON LANE NE, SUITE 200, LACEY, WA 98516 P: 360-352-1465 F: 360-352-1509 SCJALLIANCE.COM
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OFF-SITE ANALYSIS
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APPENDIX E
DESIGN CALCULATIONS AND COMPUTATIONS
WWHM2012
PROJECT REPORT
FOR FLOW CONTROL
2386.03 Renton 2/28/2018 8:36:44 AM Page 2
General Model Information
Project Name:2386.03 Renton
Site Name:
Site Address:
City:
Report Date:2/28/2018
Gage:Seatac
Data Start:1948/10/01
Data End:2009/09/30
Timestep:15 Minute
Precip Scale:1.000
Version Date:2016/11/23
Version:4.2.13
POC Thresholds
Low Flow Threshold for POC1:50 Percent of the 2 Year
High Flow Threshold for POC1:50 Year
2386.03 Renton 2/28/2018 8:36:44 AM Page 3
Landuse Basin Data
Predeveloped Land Use
Basin 1
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Forest, Mod 4.75
Pervious Total 4.75
Impervious Land Use acre
Impervious Total 0
Basin Total 4.75
Element Flows To:
Surface Interflow Groundwater
2386.03 Renton 2/28/2018 8:36:44 AM Page 4
Mitigated Land Use
Basin 1
Bypass:No
GroundWater:No
Pervious Land Use acre
C, Lawn, Mod 1
C, Forest, Steep 1.05
Pervious Total 2.05
Impervious Land Use acre
ROADS MOD 1.22
ROOF TOPS FLAT 1.03
SIDEWALKS MOD 0.45
Impervious Total 2.7
Basin Total 4.75
Element Flows To:
Surface Interflow Groundwater
Storm Capture 1 Storm Capture 1
2386.03 Renton 2/28/2018 8:36:44 AM Page 6
Mitigated Routing
Storm Capture 1
Dimensions
Depth:7 ft.
Length:1365 ft.
Width:7 ft.
Discharge Structure
Riser Height:6 ft.
Riser Diameter:18 in.
Orifice 1 Diameter:1.2 in.Elevation:0 ft.
Orifice 2 Diameter:1.9 in.Elevation:4 ft.
Orifice 3 Diameter:1.2 in.Elevation:4.5 ft.
Element Flows To:
Outlet 1 Outlet 2
SCapture Hydraulic Table
Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs)
0.0000 0.219 0.000 0.000 0.000
0.0778 0.219 0.017 0.010 0.000
0.1556 0.219 0.034 0.015 0.000
0.2333 0.219 0.051 0.018 0.000
0.3111 0.219 0.068 0.021 0.000
0.3889 0.219 0.085 0.024 0.000
0.4667 0.219 0.102 0.026 0.000
0.5444 0.219 0.119 0.028 0.000
0.6222 0.219 0.136 0.030 0.000
0.7000 0.219 0.153 0.032 0.000
0.7778 0.219 0.170 0.034 0.000
0.8556 0.219 0.187 0.036 0.000
0.9333 0.219 0.204 0.037 0.000
1.0111 0.219 0.221 0.039 0.000
1.0889 0.219 0.238 0.040 0.000
1.1667 0.219 0.255 0.042 0.000
1.2444 0.219 0.273 0.043 0.000
1.3222 0.219 0.290 0.044 0.000
1.4000 0.219 0.307 0.046 0.000
1.4778 0.219 0.324 0.047 0.000
1.5556 0.219 0.341 0.048 0.000
1.6333 0.219 0.358 0.049 0.000
1.7111 0.219 0.375 0.051 0.000
1.7889 0.219 0.392 0.052 0.000
1.8667 0.219 0.409 0.053 0.000
1.9444 0.219 0.426 0.054 0.000
2.0222 0.219 0.443 0.055 0.000
2.1000 0.219 0.460 0.056 0.000
2.1778 0.219 0.477 0.057 0.000
2.2556 0.219 0.494 0.058 0.000
2.3333 0.219 0.511 0.059 0.000
2.4111 0.219 0.528 0.060 0.000
2.4889 0.219 0.545 0.061 0.000
2.5667 0.219 0.563 0.062 0.000
2.6444 0.219 0.580 0.063 0.000
2.7222 0.219 0.597 0.064 0.000
2.8000 0.219 0.614 0.065 0.000
2386.03 Renton 2/28/2018 8:36:44 AM Page 7
2.8778 0.219 0.631 0.066 0.000
2.9556 0.219 0.648 0.067 0.000
3.0333 0.219 0.665 0.068 0.000
3.1111 0.219 0.682 0.068 0.000
3.1889 0.219 0.699 0.069 0.000
3.2667 0.219 0.716 0.070 0.000
3.3444 0.219 0.733 0.071 0.000
3.4222 0.219 0.750 0.072 0.000
3.5000 0.219 0.767 0.073 0.000
3.5778 0.219 0.784 0.073 0.000
3.6556 0.219 0.801 0.074 0.000
3.7333 0.219 0.818 0.075 0.000
3.8111 0.219 0.836 0.076 0.000
3.8889 0.219 0.853 0.077 0.000
3.9667 0.219 0.870 0.077 0.000
4.0444 0.219 0.887 0.099 0.000
4.1222 0.219 0.904 0.113 0.000
4.2000 0.219 0.921 0.123 0.000
4.2778 0.219 0.938 0.132 0.000
4.3556 0.219 0.955 0.140 0.000
4.4333 0.219 0.972 0.146 0.000
4.5111 0.219 0.989 0.157 0.000
4.5889 0.219 1.006 0.170 0.000
4.6667 0.219 1.023 0.180 0.000
4.7444 0.219 1.040 0.189 0.000
4.8222 0.219 1.057 0.196 0.000
4.9000 0.219 1.074 0.204 0.000
4.9778 0.219 1.091 0.211 0.000
5.0556 0.219 1.108 0.217 0.000
5.1333 0.219 1.126 0.223 0.000
5.2111 0.219 1.143 0.230 0.000
5.2889 0.219 1.160 0.235 0.000
5.3667 0.219 1.177 0.241 0.000
5.4444 0.219 1.194 0.246 0.000
5.5222 0.219 1.211 0.252 0.000
5.6000 0.219 1.228 0.257 0.000
5.6778 0.219 1.245 0.262 0.000
5.7556 0.219 1.262 0.267 0.000
5.8333 0.219 1.279 0.272 0.000
5.9111 0.219 1.296 0.276 0.000
5.9889 0.219 1.313 0.281 0.000
6.0667 0.219 1.330 0.559 0.000
6.1444 0.219 1.347 1.159 0.000
6.2222 0.219 1.364 1.931 0.000
6.3000 0.219 1.381 2.800 0.000
6.3778 0.219 1.399 3.689 0.000
6.4556 0.219 1.416 4.523 0.000
6.5333 0.219 1.433 5.235 0.000
6.6111 0.219 1.450 5.783 0.000
6.6889 0.219 1.467 6.168 0.000
6.7667 0.219 1.484 6.528 0.000
6.8444 0.219 1.501 6.839 0.000
6.9222 0.219 1.518 7.136 0.000
7.0000 0.219 1.535 7.421 0.000
2386.03 Renton 2/28/2018 8:36:44 AM Page 8
Analysis Results
POC 1
+ Predeveloped x Mitigated
Predeveloped Landuse Totals for POC #1
Total Pervious Area:4.75
Total Impervious Area:0
Mitigated Landuse Totals for POC #1
Total Pervious Area:2.05
Total Impervious Area:2.7
Flow Frequency Method:Log Pearson Type III 17B
Flow Frequency Return Periods for Predeveloped. POC #1
Return Period Flow(cfs)
2 year 0.141432
5 year 0.231749
10 year 0.289821
25 year 0.358901
50 year 0.406749
100 year 0.451443
Flow Frequency Return Periods for Mitigated. POC #1
Return Period Flow(cfs)
2 year 0.085579
5 year 0.138054
10 year 0.18292
25 year 0.253102
50 year 0.316525
100 year 0.39071
Annual Peaks
Annual Peaks for Predeveloped and Mitigated. POC #1
Year Predeveloped Mitigated
1949 0.163 0.061
1950 0.193 0.076
1951 0.309 0.257
1952 0.097 0.054
1953 0.078 0.066
1954 0.120 0.069
1955 0.192 0.068
1956 0.155 0.127
1957 0.125 0.068
1958 0.139 0.073
2386.03 Renton 2/28/2018 8:37:12 AM Page 9
1959 0.119 0.062
1960 0.213 0.211
1961 0.117 0.074
1962 0.073 0.052
1963 0.100 0.069
1964 0.142 0.070
1965 0.094 0.102
1966 0.091 0.064
1967 0.217 0.072
1968 0.122 0.066
1969 0.119 0.064
1970 0.095 0.068
1971 0.108 0.071
1972 0.235 0.206
1973 0.104 0.108
1974 0.115 0.072
1975 0.160 0.065
1976 0.115 0.069
1977 0.017 0.055
1978 0.097 0.074
1979 0.059 0.051
1980 0.276 0.214
1981 0.087 0.067
1982 0.179 0.136
1983 0.153 0.071
1984 0.092 0.057
1985 0.055 0.058
1986 0.242 0.100
1987 0.214 0.184
1988 0.084 0.058
1989 0.056 0.056
1990 0.512 0.221
1991 0.272 0.207
1992 0.111 0.075
1993 0.108 0.057
1994 0.036 0.049
1995 0.155 0.076
1996 0.359 0.253
1997 0.277 0.233
1998 0.068 0.057
1999 0.303 0.187
2000 0.108 0.071
2001 0.019 0.047
2002 0.125 0.100
2003 0.187 0.062
2004 0.199 0.235
2005 0.148 0.070
2006 0.166 0.108
2007 0.387 0.316
2008 0.472 0.244
2009 0.220 0.118
Ranked Annual Peaks
Ranked Annual Peaks for Predeveloped and Mitigated. POC #1
Rank Predeveloped Mitigated
1 0.5121 0.3159
2 0.4719 0.2568
3 0.3871 0.2535
2386.03 Renton 2/28/2018 8:37:12 AM Page 10
4 0.3587 0.2441
5 0.3090 0.2353
6 0.3035 0.2329
7 0.2768 0.2208
8 0.2762 0.2142
9 0.2716 0.2107
10 0.2424 0.2068
11 0.2346 0.2060
12 0.2200 0.1869
13 0.2172 0.1841
14 0.2139 0.1363
15 0.2132 0.1270
16 0.1994 0.1185
17 0.1932 0.1081
18 0.1922 0.1075
19 0.1866 0.1022
20 0.1791 0.0999
21 0.1664 0.0998
22 0.1628 0.0764
23 0.1604 0.0758
24 0.1552 0.0747
25 0.1549 0.0744
26 0.1532 0.0737
27 0.1480 0.0726
28 0.1421 0.0724
29 0.1388 0.0720
30 0.1250 0.0710
31 0.1250 0.0709
32 0.1222 0.0708
33 0.1203 0.0704
34 0.1190 0.0701
35 0.1190 0.0695
36 0.1173 0.0691
37 0.1152 0.0688
38 0.1146 0.0682
39 0.1109 0.0682
40 0.1083 0.0680
41 0.1078 0.0674
42 0.1078 0.0665
43 0.1040 0.0661
44 0.1002 0.0649
45 0.0970 0.0644
46 0.0969 0.0639
47 0.0955 0.0624
48 0.0944 0.0616
49 0.0923 0.0608
50 0.0907 0.0576
51 0.0867 0.0576
52 0.0845 0.0574
53 0.0784 0.0569
54 0.0730 0.0568
55 0.0677 0.0561
56 0.0586 0.0550
57 0.0559 0.0544
58 0.0548 0.0521
59 0.0364 0.0512
60 0.0194 0.0491
61 0.0168 0.0469
2386.03 Renton 2/28/2018 8:37:12 AM Page 12
Duration Flows
The Facility PASSED
Flow(cfs)Predev Mit Percentage Pass/Fail
0.0707 17477 15417 88 Pass
0.0741 15524 9520 61 Pass
0.0775 14264 6134 43 Pass
0.0809 13107 4909 37 Pass
0.0843 11668 4688 40 Pass
0.0877 10705 4511 42 Pass
0.0911 9589 4325 45 Pass
0.0945 8864 4175 47 Pass
0.0979 8226 4034 49 Pass
0.1013 7394 3835 51 Pass
0.1047 6857 3700 53 Pass
0.1081 6192 3527 56 Pass
0.1114 5788 3414 58 Pass
0.1148 5405 3287 60 Pass
0.1182 4943 3104 62 Pass
0.1216 4635 2990 64 Pass
0.1250 4237 2847 67 Pass
0.1284 3978 2706 68 Pass
0.1318 3720 2588 69 Pass
0.1352 3403 2387 70 Pass
0.1386 3178 2248 70 Pass
0.1420 2982 2145 71 Pass
0.1454 2725 2021 74 Pass
0.1488 2526 1935 76 Pass
0.1522 2327 1859 79 Pass
0.1556 2165 1767 81 Pass
0.1590 2019 1697 84 Pass
0.1624 1839 1629 88 Pass
0.1658 1731 1588 91 Pass
0.1691 1581 1529 96 Pass
0.1725 1460 1457 99 Pass
0.1759 1352 1399 103 Pass
0.1793 1243 1324 106 Pass
0.1827 1167 1252 107 Pass
0.1861 1086 1161 106 Pass
0.1895 1026 1102 107 Pass
0.1929 973 1048 107 Pass
0.1963 890 955 107 Pass
0.1997 840 892 106 Pass
0.2031 763 811 106 Pass
0.2065 727 742 102 Pass
0.2099 685 679 99 Pass
0.2133 629 588 93 Pass
0.2167 596 541 90 Pass
0.2201 549 480 87 Pass
0.2235 509 426 83 Pass
0.2269 476 389 81 Pass
0.2302 429 331 77 Pass
0.2336 391 295 75 Pass
0.2370 356 239 67 Pass
0.2404 329 210 63 Pass
0.2438 305 178 58 Pass
0.2472 272 151 55 Pass
2386.03 Renton 2/28/2018 8:37:12 AM Page 13
0.2506 246 129 52 Pass
0.2540 218 98 44 Pass
0.2574 200 78 39 Pass
0.2608 179 67 37 Pass
0.2642 153 59 38 Pass
0.2676 133 52 39 Pass
0.2710 122 46 37 Pass
0.2744 106 38 35 Pass
0.2778 97 33 34 Pass
0.2812 84 10 11 Pass
0.2846 77 8 10 Pass
0.2879 69 7 10 Pass
0.2913 61 7 11 Pass
0.2947 54 7 12 Pass
0.2981 46 5 10 Pass
0.3015 41 5 12 Pass
0.3049 32 5 15 Pass
0.3083 25 3 12 Pass
0.3117 22 2 9 Pass
0.3151 20 1 5 Pass
0.3185 18 0 0 Pass
0.3219 14 0 0 Pass
0.3253 12 0 0 Pass
0.3287 10 0 0 Pass
0.3321 7 0 0 Pass
0.3355 7 0 0 Pass
0.3389 7 0 0 Pass
0.3423 6 0 0 Pass
0.3457 6 0 0 Pass
0.3490 6 0 0 Pass
0.3524 6 0 0 Pass
0.3558 6 0 0 Pass
0.3592 5 0 0 Pass
0.3626 5 0 0 Pass
0.3660 5 0 0 Pass
0.3694 5 0 0 Pass
0.3728 5 0 0 Pass
0.3762 5 0 0 Pass
0.3796 5 0 0 Pass
0.3830 5 0 0 Pass
0.3864 4 0 0 Pass
0.3898 3 0 0 Pass
0.3932 3 0 0 Pass
0.3966 3 0 0 Pass
0.4000 3 0 0 Pass
0.4034 3 0 0 Pass
0.4067 3 0 0 Pass
2386.03 Renton 2/28/2018 8:37:12 AM Page 14
Water Quality
Water Quality BMP Flow and Volume for POC #1
On-line facility volume:0 acre-feet
On-line facility target flow:0 cfs.
Adjusted for 15 min:0 cfs.
Off-line facility target flow:0 cfs.
Adjusted for 15 min:0 cfs.
2386.03 Renton 2/28/2018 8:37:12 AM Page 15
LID Report
2386.03 Renton 2/28/2018 8:37:20 AM 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.
2386.03 Renton 2/28/2018 8:37:20 AM Page 17
Appendix
Predeveloped Schematic
2386.03 Renton 2/28/2018 8:37:20 AM Page 18
Mitigated Schematic
2386.03 Renton 2/28/2018 8:37:20 AM Page 31
Disclaimer
Legal Notice
This program and accompanying documentation is provided 'as-is' without warranty of any kind. The
entire risk regarding the performance and results of this program is assumed by the user. Clear Creek
Solutions, Inc. disclaims 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. has been
advised of the possibility of such damages.
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
Renton Senior housing WWHM Modeling
For Treatment
APPENDIX F
STORMWATER PLAN SHEETS
APPENDIX G
GEOTECHNICAL REPORT
EarthSolutionsNWLLC
EarthSolutions
NW LLC
Geotechnical Engineering
Geology
Environmental Scientists
Construction Monitoring
1805 -136th Place N.E.,Suite 201 Bellevue,WA 98005
(425)449-4704 Fax (425)449-4711
www.earthsolutionsnw.com
GEOTECHNICAL ENGINEERING STUDY
PROPOSED COMMERCIAL DEVELOPMENT
TALBOT ROAD SOUTH
AND SOUTH 45th PLACE
RENTON,WASHINGTON
ES-0895.03
Drwn.CAM
Checked CGH Date July 2017
Date 07/20/2017 Proj.No.0895.03
Plate 1
Earth Solutions NWLLC
Geotechnical Engineering,Construction Monitoring
EarthSolutionsNWLLC
EarthSolutions
NW LLC and Environmental Sciences
Vicinity Map
Talbot Commercial
Renton,Washington
Reference:
King County,Washington
Map 686
By The Thomas Guide
Rand McNally
32nd Edition
NORTH
NOTE:This plate may contain areas of color.ESNW cannot be
responsible for any subsequent misinterpretation of the information
resulting from black &white reproductions of this plate.
SITE
Plate
Proj.No.
Date
Checked By
Drwn.By
E a r t h
S o l u t i o n s
N W L L C
G e o t e c h n i c a l
E n g i n e e r i n g ,
C o n s t r u c t i o n
M o n i t o r i n g
a n d
E n v i r o n m e n t a l
S c i e n c e s
E a r t h
S o l u t i o n s
N W L L C
E a r t h
S o l u t i o n s
N W
L L C
t a l b o t
r d .
s .
160
160
170
170
180
180 190 200 210 220
230
240
240230220210200190
TP-1
TP-2
TP-3
TP-4TP-5
TP-6
TP-1
TP-2
TP-3
TP-4
TP-5
NOTE:This plate may contain areas of color.ESNW cannot be
responsible for any subsequent misinterpretation of the information
resulting from black &white reproductions of this plate.
NOTE:The graphics shown on this plate are not intended for design
purposes or precise scale measurements,but only to illustrate the
approximate test locations relative to the approximate locations of
existing and /or proposed site features.The information illustrated
is largely based on data provided by the client at the time of our
study.ESNW cannot be responsible for subsequent design changes
or interpretation of the data by others.
LEGEND
Approximate Location of
ESNW Test Pit,Proj.No.
ES-0895,May 2007
Approximate Location of
ESNW Test Pit,Proj.No.
ES-0690,Nov.2006
Subject Site
TP-1
NORTH
0 4 0 8 0 1 6 0
Scale in Feet1"=8 0 '
TP-1
CAM
CGH
07/20/2017
0895.03
2
T e s t
P i t
L o c a t i o n
P l a n
T a l b o t
C o m m e r c i a l
R e n t o n ,
W a s h i n g t o n
Drwn.CAM
Checked CGH Date July 2017
Date 07/20/2017 Proj.No.0895.03
Plate 3
Earth Solutions NWLLC
Geotechnical Engineering,Construction Monitoring
and Environmental Sciences
EarthSolutionsNWLLC
EarthSolutions
NW LLC
RETAINING WALL DRAINAGE DETAIL
Talbot Commercial
Renton,Washington
NOTES:
Free Draining Backfill should consist
of soil having less than 5 percent fines.
Percent passing #4 should be 25 to
75 percent.
Sheet Drain may be feasible in lieu
of Free Draining Backfill,per ESNW
recommendations.
Drain Pipe should consist of perforated,
rigid PVC Pipe surrounded with 1"
Drain Rock.
LEGEND:
Free Draining Structural Backfill
1 inch Drain Rock
18"Min.
Structural
Fill
Perforated Drain Pipe
(Surround In Drain Rock)
SCHEMATIC ONLY -NOT TO SCALE
NOT A CONSTRUCTION DRAWING
Drwn.CAM
Checked CGH Date July 2017
Date 07/20/2017 Proj.No.0895.03
Plate 4
Earth Solutions NWLLC
Geotechnical Engineering,Construction Monitoring
and Environmental Sciences
EarthSolutionsNWLLC
EarthSolutions
NW LLC
FOOTING DRAIN DETAIL
Talbot Commercial
Renton,Washington
Slope
Perforated Rigid Drain Pipe
(Surround with 1"Rock)
18"(Min.)
NOTES:
Do NOT tie roof downspouts
to Footing Drain.
Surface Seal to consist of
12"of less permeable,suitable
soil.Slope away from building.
LEGEND:
Surface Seal;native soil or
other low permeability material.
1"Drain Rock
SCHEMATIC ONLY -NOT TO SCALE
NOT A CONSTRUCTION DRAW ING
APPENDIX H
CONSTRUCTION SWPPP
APPENDIX I
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T
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T
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L
:
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Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 12/20/2017
CE
D
P
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t
#
:
#
#
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#
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)
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Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 12/20/2017
CE
D
P
e
r
m
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t
#
:
#
#
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#
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x
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u
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d
c
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c
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1
7.
0
0
$
LF
Sa
w
c
u
t
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a
s
p
h
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1.
8
5
$
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Sa
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3.
0
0
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LF
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a
l
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2.
0
0
$
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o
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d
e
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15
.
0
0
$
SY
Si
d
e
w
a
l
k
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4
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h
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c
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RI
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1
6
38
.
0
0
$
SY
Si
d
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w
a
l
k
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4
"
t
h
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c
k
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e
m
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d
d
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s
p
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a
l
RI
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1
7
32
.
0
0
$
SY
Si
d
e
w
a
l
k
,
5
"
t
h
i
c
k
RI
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1
8
41
.
0
0
$
SY
Si
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e
w
a
l
k
,
5
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t
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c
k
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d
e
m
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l
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t
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a
n
d
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s
a
l
RI
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1
9
40
.
0
0
$
SY
Si
g
n
,
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a
n
d
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p
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2
0
85
.
0
0
$
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h
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0
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h
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r
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o
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(
f
o
r
c
r
o
s
s
w
a
l
k
)
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2
2
3.
0
0
$
SF
St
r
i
p
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n
g
,
4
"
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e
f
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e
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t
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RI
-
2
3
0.
5
0
$
LF
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d
i
t
i
o
n
a
l
2
.
5
"
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r
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h
e
d
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f
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c
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2
4
3.
6
0
$
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HM
A
1
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2
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l
a
y
1
.
5
"
RI
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2
5
14
.
0
0
$
SY
HM
A
1
/
2
"
O
v
e
r
l
a
y
2
"
RI
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2
6
18
.
0
0
$
SY
HM
A
R
o
a
d
,
2
"
,
4
"
r
o
c
k
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F
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2
5
0
0
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Y
RI
-
2
7
28
.
0
0
$
SY
HM
A
R
o
a
d
,
2
"
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4
"
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c
k
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Q
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o
v
e
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2
5
0
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Y
RI
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2
8
21
.
0
0
$
SY
HM
A
R
o
a
d
,
4
"
,
6
"
r
o
c
k
,
F
i
r
s
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2
5
0
0
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Y
RI
-
2
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45
.
0
0
$
SY
HM
A
R
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a
d
,
4
"
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6
"
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k
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Q
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o
v
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2
5
0
0
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Y
RI
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0
37
.
0
0
$
SY
HM
A
R
o
a
d
,
4
"
,
4
.
5
"
A
T
B
RI
-
3
1
38
.
0
0
$
SY
Gr
a
v
e
l
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o
a
d
,
4
"
r
o
c
k
,
F
i
r
s
t
2
5
0
0
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Y
RI
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3
2
15
.
0
0
$
SY
Gr
a
v
e
l
R
o
a
d
,
4
"
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c
k
,
Q
t
y
.
o
v
e
r
2
5
0
0
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Y
RI
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3
3
10
.
0
0
$
SY
Th
i
c
k
e
n
e
d
E
d
g
e
RI
-
3
4
8.
6
0
$
LF
SU
B
T
O
T
A
L
T
H
I
S
P
A
G
E
:
(B
)
(C
)
(D)(E)
Pa
g
e
5
o
f
1
4
Re
f
8
-
H
B
o
n
d
Q
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a
n
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t
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W
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SE
C
T
I
O
N
I
I
.
b
T
R
A
N
S
P
O
R
T
A
T
I
O
N
Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 12/20/2017
CE
D
P
e
r
m
i
t
#
:
#
#
#
#
#
#
#
#
Ex
i
s
t
i
n
g
Fu
t
u
r
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P
u
b
l
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c
Pr
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v
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t
e
Ri
g
h
t
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o
f
-
W
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y
Im
p
r
o
v
e
m
e
n
t
s
Im
p
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o
v
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m
e
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t
s
(D
)
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De
s
c
r
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p
t
i
o
n
No
.
Un
i
t
P
r
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c
e
Un
i
t
Qu
a
n
t
.
Co
s
t
Qu
a
n
t
.
Co
s
t
Qu
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n
t
.
Cost Quant.Cost
SI
T
E
I
M
P
R
O
V
E
M
E
N
T
B
O
N
D
Q
U
A
N
T
I
T
Y
W
O
R
K
S
H
E
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T
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S
T
R
E
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T
A
N
D
S
I
T
E
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M
P
R
O
V
E
M
E
N
T
S
Quantity Remaining (Bond Reduction)
(B
)
(C
)
PA
R
K
I
N
G
L
O
T
S
U
R
F
A
C
I
N
G
No
.
2"
A
C
,
2
"
t
o
p
c
o
u
r
s
e
r
o
c
k
&
4
"
b
o
r
r
o
w
PL
-
1
21
.
0
0
$
SY
2"
A
C
,
1
.
5
"
t
o
p
c
o
u
r
s
e
&
2
.
5
"
b
a
s
e
c
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r
s
e
PL
-
2
28
.
0
0
$
SY
85
2,
3
8
0
.
0
0
17
6
4,
9
2
8
.
0
0
55
5
5
15
5
,
5
4
0
.
0
0
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s
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l
e
c
t
b
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w
PL
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3
5.
0
0
$
SY
1.
5
"
t
o
p
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o
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r
s
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o
c
k
&
2
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5
"
b
a
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r
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PL
-
4
14
.
0
0
$
SY
SU
B
T
O
T
A
L
P
A
R
K
I
N
G
L
O
T
S
U
R
F
A
C
I
N
G
:
2,
3
8
0
.
0
0
4,
9
2
8
.
0
0
15
5
,
5
4
0
.
0
0
(B
)
(C
)
(D)(E)
LA
N
D
S
C
A
P
I
N
G
&
V
E
G
E
T
A
T
I
O
N
No
.
St
r
e
e
t
T
r
e
e
s
LA
-
1
Me
d
i
a
n
L
a
n
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s
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g
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-
2
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g
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t
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f
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y
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a
n
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s
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a
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g
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3
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t
l
a
n
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L
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n
d
s
c
a
p
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4
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B
T
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T
A
L
L
A
N
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S
C
A
P
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N
G
&
V
E
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E
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A
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O
N
:
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)
(C
)
(D)(E)
TR
A
F
F
I
C
&
L
I
G
H
T
I
N
G
No
.
Si
g
n
s
TR
-
1
St
r
e
e
t
L
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g
h
t
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y
s
t
e
m
(
#
o
f
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l
e
s
)
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2
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f
f
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c
S
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g
n
a
l
TR
-
3
Tr
a
f
f
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c
S
i
g
n
a
l
M
o
d
i
f
i
c
a
t
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o
n
TR
-
4
SU
B
T
O
T
A
L
T
R
A
F
F
I
C
&
L
I
G
H
T
I
N
G
:
(B
)
(C
)
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WR
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T
E
-
I
N
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I
T
E
M
S
SU
B
T
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T
A
L
W
R
I
T
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N
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T
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S
:
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R
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M
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E
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B
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L
:
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3
8
0
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0
0
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9
2
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.
0
0
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5
,
5
4
0
.
0
0
SA
L
E
S
T
A
X
@
1
0
%
23
8
.
0
0
49
2
.
8
0
15,554.00
ST
R
E
E
T
A
N
D
S
I
T
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M
P
R
O
V
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T
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L
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6
1
8
.
0
0
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4
2
0
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8
0
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1
,
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9
4
.
0
0
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)
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)
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Pa
g
e
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f
1
4
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f
8
-
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B
o
n
d
Q
u
a
n
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t
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O
N
I
I
.
b
T
R
A
N
S
P
O
R
T
A
T
I
O
N
Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 12/20/2017
CE
D
P
e
r
m
i
t
#
:
#
#
#
#
#
#
#
#
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7
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0
0
$
Ea
c
h
Cl
e
a
n
o
u
t
,
P
V
C
,
6
"
D-
2
1
17
0
.
0
0
$
Ea
c
h
Cl
e
a
n
o
u
t
,
P
V
C
,
8
"
D-
2
2
20
0
.
0
0
$
Ea
c
h
Cu
l
v
e
r
t
,
P
V
C
,
4
"
D-
2
3
10
.
0
0
$
LF
Cu
l
v
e
r
t
,
P
V
C
,
6
"
D-
2
4
13
.
0
0
$
LF
Cu
l
v
e
r
t
,
P
V
C
,
8
"
D-
2
5
15
.
0
0
$
LF
Cu
l
v
e
r
t
,
P
V
C
,
1
2
"
D-
2
6
23
.
0
0
$
LF
15
34
5
.
0
0
66
0
15
,
1
8
0
.
0
0
Cu
l
v
e
r
t
,
P
V
C
,
1
5
"
D-
2
7
35
.
0
0
$
LF
Cu
l
v
e
r
t
,
P
V
C
,
1
8
"
D-
2
8
41
.
0
0
$
LF
Cu
l
v
e
r
t
,
P
V
C
,
2
4
"
D-
2
9
56
.
0
0
$
LF
Cu
l
v
e
r
t
,
P
V
C
,
3
0
"
D-
3
0
78
.
0
0
$
LF
Cu
l
v
e
r
t
,
P
V
C
,
3
6
"
D-
3
1
13
0
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
M
P
,
8
"
D-
3
2
19
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
M
P
,
1
2
"
D-
3
3
29
.
0
0
$
LF
SU
B
T
O
T
A
L
T
H
I
S
P
A
G
E
:
1,
5
0
0
.
0
0
1,
8
4
5
.
0
0
30
,
1
8
0
.
0
0
(B
)
(C
)
(D
)
(E)Quantity Remaining (Bond Reduction)
(B
)
(C
)
SI
T
E
I
M
P
R
O
V
E
M
E
N
T
B
O
N
D
Q
U
A
N
T
I
T
Y
W
O
R
K
S
H
E
E
T
FO
R
D
R
A
I
N
A
G
E
A
N
D
S
T
O
R
M
W
A
T
E
R
F
A
C
I
L
I
T
I
E
S
Pa
g
e
7
o
f
1
4
Re
f
8
-
H
B
o
n
d
Q
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a
n
t
i
t
y
W
o
r
k
s
h
e
e
t
SE
C
T
I
O
N
I
I
.
c
D
R
A
I
N
A
G
E
Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 12/20/2017
CE
D
P
e
r
m
i
t
#
:
#
#
#
#
#
#
#
#
Ex
i
s
t
i
n
g
Fu
t
u
r
e
P
u
b
l
i
c
Pr
i
v
a
t
e
Ri
g
h
t
-
o
f
-
W
a
y
Im
p
r
o
v
e
m
e
n
t
s
Im
p
r
o
v
e
m
e
n
t
s
(D
)
(E)
De
s
c
r
i
p
t
i
o
n
No
.
Un
i
t
P
r
i
c
e
Un
i
t
Qu
a
n
t
.
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s
t
Qu
a
n
t
.
Co
s
t
Qu
a
n
t
.
Co
s
t
Quant.CostQuantity Remaining (Bond Reduction)
(B
)
(C
)
SI
T
E
I
M
P
R
O
V
E
M
E
N
T
B
O
N
D
Q
U
A
N
T
I
T
Y
W
O
R
K
S
H
E
E
T
FO
R
D
R
A
I
N
A
G
E
A
N
D
S
T
O
R
M
W
A
T
E
R
F
A
C
I
L
I
T
I
E
S
DR
A
I
N
A
G
E
(
C
o
n
t
i
n
u
e
d
)
Cu
l
v
e
r
t
,
C
M
P
,
1
5
"
D-
3
4
35
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
M
P
,
1
8
"
D-
3
5
41
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
M
P
,
2
4
"
D-
3
6
56
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
M
P
,
3
0
"
D-
3
7
78
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
M
P
,
3
6
"
D-
3
8
13
0
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
M
P
,
4
8
"
D-
3
9
19
0
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
M
P
,
6
0
"
D-
4
0
27
0
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
M
P
,
7
2
"
D-
4
1
35
0
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
o
n
c
r
e
t
e
,
8
"
D-
4
2
42
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
o
n
c
r
e
t
e
,
1
2
"
D-
4
3
48
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
o
n
c
r
e
t
e
,
1
5
"
D-
4
4
78
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
o
n
c
r
e
t
e
,
1
8
"
D-
4
5
48
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
o
n
c
r
e
t
e
,
2
4
"
D-
4
6
78
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
o
n
c
r
e
t
e
,
3
0
"
D-
4
7
12
5
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
o
n
c
r
e
t
e
,
3
6
"
D-
4
8
15
0
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
o
n
c
r
e
t
e
,
4
2
"
D-
4
9
17
5
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
o
n
c
r
e
t
e
,
4
8
"
D-
5
0
20
5
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
P
E
T
r
i
p
l
e
W
a
l
l
,
6
"
D-
5
1
14
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
P
E
T
r
i
p
l
e
W
a
l
l
,
8
"
D-
5
2
16
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
P
E
T
r
i
p
l
e
W
a
l
l
,
1
2
"
D-
5
3
24
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
P
E
T
r
i
p
l
e
W
a
l
l
,
1
5
"
D-
5
4
35
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
P
E
T
r
i
p
l
e
W
a
l
l
,
1
8
"
D-
5
5
41
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
P
E
T
r
i
p
l
e
W
a
l
l
,
2
4
"
D-
5
6
56
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
P
E
T
r
i
p
l
e
W
a
l
l
,
3
0
"
D-
5
7
78
.
0
0
$
LF
Cu
l
v
e
r
t
,
C
P
E
T
r
i
p
l
e
W
a
l
l
,
3
6
"
D-
5
8
13
0
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
6
"
D-
5
9
60
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
8
"
D-
6
0
72
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
1
2
"
D-
6
1
84
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
1
5
"
D-
6
2
96
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
1
8
"
D-
6
3
10
8
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
2
4
"
D-
6
4
12
0
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
3
0
"
D-
6
5
13
2
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
3
6
"
D-
6
6
14
4
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
4
8
"
D-
6
7
15
6
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
5
4
"
D-
6
8
16
8
.
0
0
$
LF
SU
B
T
O
T
A
L
T
H
I
S
P
A
G
E
:
(B
)
(C
)
(D
)
(E)
Pa
g
e
8
o
f
1
4
Re
f
8
-
H
B
o
n
d
Q
u
a
n
t
i
t
y
W
o
r
k
s
h
e
e
t
SE
C
T
I
O
N
I
I
.
c
D
R
A
I
N
A
G
E
Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 12/20/2017
CE
D
P
e
r
m
i
t
#
:
#
#
#
#
#
#
#
#
Ex
i
s
t
i
n
g
Fu
t
u
r
e
P
u
b
l
i
c
Pr
i
v
a
t
e
Ri
g
h
t
-
o
f
-
W
a
y
Im
p
r
o
v
e
m
e
n
t
s
Im
p
r
o
v
e
m
e
n
t
s
(D
)
(E)
De
s
c
r
i
p
t
i
o
n
No
.
Un
i
t
P
r
i
c
e
Un
i
t
Qu
a
n
t
.
Co
s
t
Qu
a
n
t
.
Co
s
t
Qu
a
n
t
.
Co
s
t
Quant.CostQuantity Remaining (Bond Reduction)
(B
)
(C
)
SI
T
E
I
M
P
R
O
V
E
M
E
N
T
B
O
N
D
Q
U
A
N
T
I
T
Y
W
O
R
K
S
H
E
E
T
FO
R
D
R
A
I
N
A
G
E
A
N
D
S
T
O
R
M
W
A
T
E
R
F
A
C
I
L
I
T
I
E
S
DR
A
I
N
A
G
E
(
C
o
n
t
i
n
u
e
d
)
Cu
l
v
e
r
t
,
L
C
P
E
,
6
0
"
D-
6
9
18
0
.
0
0
$
LF
Cu
l
v
e
r
t
,
L
C
P
E
,
7
2
"
D-
7
0
19
2
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
6
"
D-
7
1
42
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
8
"
D-
7
2
42
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
1
2
"
D-
7
3
74
.
0
0
$
LF
17
0
12
,
5
8
0
.
0
0
Cu
l
v
e
r
t
,
H
D
P
E
,
1
5
"
D-
7
4
10
6
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
1
8
"
D-
7
5
13
8
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
2
4
"
D-
7
6
22
1
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
3
0
"
D-
7
7
27
6
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
3
6
"
D-
7
8
33
1
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
4
8
"
D-
7
9
38
6
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
5
4
"
D-
8
0
44
1
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
6
0
"
D-
8
1
49
6
.
0
0
$
LF
Cu
l
v
e
r
t
,
H
D
P
E
,
7
2
"
D-
8
2
55
1
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
6
"
D-
8
3
84
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
8
"
D-
8
4
89
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
1
2
"
D-
8
5
95
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
1
5
"
D-
8
6
10
0
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
1
8
"
D-
8
7
10
6
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
2
4
"
D-
8
8
11
1
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
3
0
"
D-
8
9
11
9
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
3
6
"
D-
9
0
15
4
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
4
8
"
D-
9
1
22
6
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
5
4
"
D-
9
2
33
2
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
6
0
"
D-
9
3
43
9
.
0
0
$
LF
Pi
p
e
,
P
o
l
y
p
r
o
p
y
l
e
n
e
,
7
2
"
D-
9
4
54
5
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Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 12/20/2017
CE
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Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 12/20/2017
Pl
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Unit Prices Updated: 06/14/2016 Version: 04/26/2017 Printed 12/20/2017
APPENDIX J
OPERATIONS AND MAINTENANCE MANUAL
Renton Senior Housing Maintenance Plan
Maintenance Program
Cover Sheet
Inspection Period:
Number of Sheets Attached:
Date Inspected:
Inspector’s Signature:
The following pages contain maintenance needs for most of the components that are part of your
drainage system, as well as for some components that you may not have. Let the City know if there are
any components that are missing from these pages. Ignore the requirements that do not apply to your
system. You should plan to complete a checklist for all system components on the following schedule:
(M) Monthly from October (or November) through April
(A) Once in late summer (preferably September)
(C) Once in mid summer (late July or early August)
(S) After any major storm (use 1 inch in 24 hours as a guideline)
(B) Biannually (twice per year - refer to individual checklist for timing)
(Q) Quarterly
Use photocopies of these pages and check off the problems you looked for each time you did an
inspection. Add comments on problems found and actions taken. Keep these “checked" sheets in your
files, as they will be used to write your annual report. Some items do not need to be looked at every
time an inspection is done.
The facility - specific maintenance standards contained in this section are intended to be conditions for
determining if maintenance actions are required as identified through inspection. They are not intended
to be measures of the facility's required condition at all times between inspections. In other words,
exceedance of these conditions at any time between inspections and/or maintenance does not
automatically constitute a violation of these standards. However, based upon inspection observations,
the inspection and maintenance schedules shall be adjusted to minimize the length of time that a facility
is in a condition that requires a maintenance action.
A TESC certified professional will be designated prior to construction and will conduct inspections as well
as identify a maintenance program for any erosion control measures.
Renton Senior Housing Maintenance Plan
Maintenance covenants shall include the maintenance standards specified by Appendix A in 2017 City of
Renton Surface Water Design Manual. Included is a list of maintenance activities and proposed
inspection intervals for each element of the private stormwater system, and a guarantee that any
maintenance necessary for any element of the stormwater system will be performed to the standards
specified by the Manual and within the following schedule:
1. Within one year for wet pool facilities and retention/detention ponds;
2. Within six months for typical maintenance;
3. Within nine months for maintenance requiring re-vegetation;
4. Within two years for maintenance that requires capital construction of less than $25,000.
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-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 K
DECLARATION OF COVENANT