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HomeMy WebLinkAboutTIR-4203TECHNICAL INFORMATION REPORT October 6, 2021 Revised December 10, 2021 PROJECT Straight Arrow Homes 1218 N 35th St Renton SFRs 1218 N 35th St Renton, WA 98056 OWNER Straight Arrow Homes LLC C/O Brandon Shimizu 12015 NE 8th St, Ste 5 Bellevue, WA, 98005-3141 DEVELOPER Straight Arrow Homes LLC C/O Brandon Shimizu 12015 NE 8th St, Ste 5 Bellevue, WA, 98005-3141 ENGINEER/PREPARED BY Andy Epstein Third Day Design, LLC 5918 Waller Road E, Tacoma WA 98443 (253) 256-1812 andy@thirddaydesign.com TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 2 of 46 TABLE OF CONTENTS PROJECT ENGINEERS CERTIFICATE ................................................................................................................ 4 DRAINAGE REPORT ....................................................................................................................................... 4 Section 1 – Project Overview .................................................................................................................... 4 Onsite Soils ............................................................................................................................................ 5 Figure 1.1 – TIR Worksheet ............................................................................................................... 6 Figure 1.2 – Site Location ................................................................................................................ 12 Figure 1.3 – Aerial Site Photo .......................................................................................................... 13 eXISTING AND dEVELOPED CONDTIONS ............................................................................................. 14 Figure 1.4 – Developed and Existing Basin Area Summary ............................................................. 14 Figure 1.5 – Existing Basin Map ...................................................................................................... 15 Figure 1.6 – Developed Basin Map ................................................................................................. 16 Section 2 – Conditions and Requirements Summary ............................................................................. 17 Drainage Review Type ..................................................................................................................... 17 Figure 2.1 – Renton Surface Water Design Manual Flow Chart for Determining Type of Drainge Review Required ............................................................................................................................. 19 Core Requirement #1: Discharge at the Natural Location .............................................................. 20 Core Requirement #2: Offsite Analysis ........................................................................................... 20 Core Requirement #3: Flow Control ............................................................................................... 20 Core Requirement #4: Conveyance System .................................................................................... 20 Core Requirement #5: CSWPP ........................................................................................................ 20 Core Requirement #6: Maintenance and Operations ..................................................................... 20 Core Requirement #7: Financial Guarantees and Liability .............................................................. 21 Core Requirement #8: Water Quality Facilities .............................................................................. 21 Core Requirement #9: Flow Control BMPs ..................................................................................... 21 Special Requirement #1: Other Adopted Areas-Specific Requirement .......................................... 21 Special Requirement #2: Flood Hazard Area Delineation ............................................................... 21 Special Requirement #3: Flood Protection Facility ......................................................................... 21 Special Requirement #4: Source Control ........................................................................................ 21 Special Requirement #5: Oil Control ............................................................................................... 21 Special Requirement #6: Aquifer Protection Area .......................................................................... 22 Section 3 – Offsite Analysis ..................................................................................................................... 22 Figure 3.1 – Downstream Map........................................................................................................ 23 Figure 3.2 – City of Renton Critical Areas Map ............................................................................... 25 Section 4 – Flow Control, LID and WQ Facility Analysis and Design ....................................................... 30 TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 3 of 46 Part A: Existing Site Hydrology ............................................................................................................ 30 Part B: developed site hydrology ........................................................................................................ 30 Part C: Performance Standards ........................................................................................................... 30 Part D: FLOW CONTROL SYSTEM ........................................................................................................ 32 Figure 4.1 – Existing vs Developed Peak Flows (POC 3) .................................................................. 33 Part E: WATER QUALITY SYSTEM ........................................................................................................ 33 Section 5 – Conveyance System Analysis and Design ............................................................................. 34 Section 6 – Special Reports and Studies ................................................................................................. 34 Section 7 – Other Permits ....................................................................................................................... 34 Section 8 – Construction Stormwater Pollution Prevention Analysis and Design .................................. 34 Section 9 – Bond Quantities, Facility Summaries, and Declaration of Covenant ................................... 36 Section 10 – Operations and Maintenance Manual ............................................................................... 36 APPENDICIES ............................................................................................................................................... 37 APPENDIX A – SURVEY ................................................................................................................................ 38 APPENDIX B – GEOTECHNICAL REPORT AND ADDENDUM LETTER ............................................................ 40 APPENDIX C – DECLARATION OF COVENANT ............................................................................................. 41 APPENDIX D – OPERATIONS AND MAINTENANCE MANUAL ...................................................................... 42 APPENDIX E – WWHM REPORT................................................................................................................... 46 TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 4 of 46 PROJECT ENGINEERS CERTIFICATE I hereby state that this report for the residential project at 1218 N 35th St in Renton, Washington has been prepared by me or under my supervision and meets the standard of care and expertise which is usual and customary in this community for professional engineers. DRAINAGE REPORT Section 1 – Project Overview The project site is located in the City of Renton on two separate tax parcels that are zoned R-8 (single family residential) which are located on the north side of N 35th Street and one lot west of Park Ave N. These two lots underwent a Lot Segregation in 2021 and previously included one single family residence with a detached garage with a concrete driveway off of N 35th St as well as an onsite walkway, steps and a block wall between the residence and the street to the south. There was also a shed and a concrete patio on the north side of the residence. The property was vegetated with lawn-grass, shrubs and trees. All onsite improvements will be removed as a part of the lot segregation process. The site is bound by single family residences to the north, east, and west, and N 35th St to the south. The site slopes from northeast to the southwest at approximately 1 percent to 8 percent. Runoff from the onsite improvements that is not dispersed onsite drains to N 35th St. Runoff from the site drains to Lake Washington via N 35th St and the city of Renton conveyance system. Refer to Figure 1.1 for a completed Technical Information Report Worksheet. Refer to Figures 1.2 and 1.3 for a vicinity map and an aerial photo. A survey is included in Appendix A. Utilities (power, gas, water and sewer) are available in N 35th Street. There are no known critical areas on or within 200 feet of the site. TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 5 of 46 Based on the City Renton code, the 2016 Renton Surface Water Design Manual (2016 RSWDM), the City of Renton COR Maps website, King County iMap, and the survey this site is as follows: Site Address (South Lot) 1218 N 35th St, Renton, WA 98056 King County Parcel No. 334210-2885 (East) and 334210-2890 (West) Zoning R-8 UGA Inside the Urban Growth Area CARA Outside Aquifer Protection Area Zone 2 Steep Slope/ Erosion/Landslide Hazard Areas Outside of and at least 200-ft away from all hazard areas Shoreline Designation NA Lot Area 10,809 SF or 0.248 Acres per survey (5,400 SF each lot per KC Dept of Assessments) Onsite Slopes 1% to 8% Condition Developed, and landscaped primarily with grass, deciduous trees, as well as shrubs/bushes Critical Areas None Flow Control Not Applicable Water Quality Not Applicable ONSITE SOILS Subsurface investigation was completed by Pioneer Engineers, Inc. as documented in a project specific report prepared by Pioneer Engineers, Inc., dated September 1, 2021. Investigation included three test pits (TP) – one on each site within the proposed building footprint and one at the south end of the site near the proposed infiltration trenches. A separate small scale PIT test was completed on the boundary between the two sites at the northerly end of the lot. The observed soil conditions in TP1 and 2 holes completed on July 20, 2021, was as follows from the surface to the termination point: · 3 inches of topsoil. · 4.25 to 5.25 feet of fill (brown to light brown silty, fine sand, demolition debris, loose, dry) · 2.5 to 3.5 feet of light gray, silty, fine SAND, trace coarse gravel, trace orange staining, medium- dense, slightly moist. (Vashon Till; Sandy Loam). Becomes dense around 6 to 6.5 feet. Test pits were terminated at 8 feet. TP-3 was completed on August 18, 2021, to observe soil conditions closer to the proposed infiltration trenches and was as follows from the surface to the termination point: · 4” concrete slab · 2.75 feet of fill (brown to light brown silty, fine sand, demolition debris, loose, dry) · 6 feet of light gray, silty, fine SAND, trace coarse gravel, trace orange staining, medium-dense, slightly moist. (Vashon Till; Sandy Loam) to termination point @ 9 feet. No groundwater was encountered during exploration in either pit. The soils were classified by the geotechnical engineer using the unified soil classification system (USCS) as SM. Per the geotechnical report, infiltration is feasible. A small-scale PIT was conducted and a measured infiltration rate of 0.3 inches was obtained from the test. The geotechnical engineer provided a combined factor of safety of 0.375, resulting in a design infiltration rate of 0.11 in/hr. No groundwater was not observed at the test site. The geotechnical report is included in Appendix B. TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 6 of 46 Figure 1.1 – TIR Worksheet TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT LOCATION AND DESCRIPTION Project Owner _____________________________ Phone ___________________________________ Address __________________________________ _________________________________________ Project Engineer ___________________________ Company _________________________________ Phone ___________________________________ Project Name __________________________ CED Permit # ________________________ Location Township ________________ Range __________________ Section _________________ Site Address __________________________ _____________________________________ Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS  Land Use (e.g., Subdivision / Short Subd.)  Building (e.g., M/F / Commercial / SFR)  Grading  Right-of-Way Use  Other _______________________  DFW HPA  COE 404  DOE Dam Safety  FEMA Floodplain  COE Wetlands  Other ________  Shoreline Management  Structural Rockery/Vault/_____  ESA Section 7 Part 5 PLAN AND REPORT INFORMATION Technical Information Report Site Improvement Plan (Engr. Plans) Type of Drainage Review (check one): Date (include revision dates): Date of Final:  Full  Targeted  Simplified  Large Project  Directed ____________________________________ __________________ Plan Type (check one): Date (include revision dates): Date of Final:  Full  Modified  Simplified ____________________________________ __________________ Andy Epstein, P.E. Third Day Design, LLC (253) 256-1812 Town Straight Arrow Renton N 35th SFRs X X 24 North 5 East 32 12015 NE 8th St, Ste 5 Bellevue, WA 98005 Straight Arrow Homes, LLC BLD_____ X X 1218 N 35th St, Renton, WA 98056 (425) 443-5458 10/6/2021 10/6/2021 REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 12/12/2016 2017 City of Renton Surface Water Design Manual 8-A-2 Part 6 SWDM ADJUSTMENT APPROVALS Type (circle one): Standard / Blanket Description: (include conditions in TIR Section 2) ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Approved Adjustment No. ______________________ Date of Approval: _______________________ Part 7 MONITORING REQUIREMENTS Monitoring Required: Yes / No Start Date: _______________________ Completion Date: _______________________ Describe: _________________________________ _________________________________________ _________________________________________ Re: SWDM Adjustment No. ________________ Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan: ____________________________________________________________________ Special District Overlays: ______________________________________________________________ Drainage Basin: _____________________________________________________________________ Stormwater Requirements: _____________________________________________________________ Part 9 ONSITE AND ADJACENT SENSITIVE AREAS  River/Stream ________________________  Lake ______________________________  Wetlands ____________________________  Closed Depression ____________________  Floodplain ___________________________  Other _______________________________ _______________________________  Steep Slope __________________________  Erosion Hazard _______________________  Landslide Hazard ______________________  Coal Mine Hazard ______________________  Seismic Hazard _______________________  Habitat Protection ______________________  _____________________________________ East Lake Washington Core Requirement 1 - 9, Special Requirement 1 - 5; peak rate flow control standard Kennydale NA REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2017 City of Renton Surface Water Design Manual 12/12/2016 Ref 8-A-3 Part 10 SOILS Soil Type ______________________ ______________________ ______________________ ______________________ Slopes ________________________ ________________________ ________________________ ________________________ Erosion Potential _________________________ _________________________ _________________________ _________________________  High Groundwater Table (within 5 feet)  Other ________________________________  Sole Source Aquifer  Seeps/Springs  Additional Sheets Attached Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE  Core 2 – Offsite Analysis_________________  Sensitive/Critical Areas__________________  SEPA________________________________  LID Infeasibility________________________  Other________________________________  _____________________________________ LIMITATION / SITE CONSTRAINT _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________  Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: (name or description) Core Requirements (all 8 apply): Discharge at Natural Location Number of Natural Discharge Locations: Offsite Analysis Level: 1 / 2 / 3 dated:__________________ Flow Control (include facility summary sheet) Standard: _______________________________ or Exemption Number: ____________ On-site BMPs: _______________________________ Conveyance System Spill containment located at: _____________________________ Erosion and Sediment Control / Construction Stormwater Pollution Prevention CSWPP/CESCL/ESC Site Supervisor: _____________________ Contact Phone: _________________________ After Hours Phone: _________________________ East Lake Washington 1 TBD NA NA NA August 3, 2021 Full Infiltration per LID Performance Std. 2 Peak Rate Flow Control Standard REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 12/12/2016 2017 City of Renton Surface Water Design Manual 8-A-4 Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Maintenance and Operation Responsibility (circle one): Private / Public If Private, Maintenance Log Required: Yes / No Financial Guarantees and Liability Provided: Yes / No Water Quality (include facility summary sheet) Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog or Exemption No. _______________________ Special Requirements (as applicable): Area Specific Drainage Requirements Type: SDO / MDP / BP / Shared Fac. / None Name: ________________________ Floodplain/Floodway Delineation Type (circle one): Major / Minor / Exemption / None 100-year Base Flood Elevation (or range): _______________ Datum: Flood Protection Facilities Describe: Source Control (commercial / industrial land use) Describe land use: Describe any structural controls: Oil Control High-Use Site: Yes / No Treatment BMP: _________________________________ Maintenance Agreement: Yes / No with whom? _____________________________________ Other Drainage Structures Describe: NA NA #1 - AREA EXEMPTION NA SINGLE FAMILY RESIDENTIAL REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2017 City of Renton Surface Water Design Manual 12/12/2016 Ref 8-A-5 Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION  Clearing Limits  Cover Measures  Perimeter Protection  Traffic Area Stabilization  Sediment Retention  Surface Water Collection  Dewatering Control  Dust Control  Flow Control  Control Pollutants  Protect Existing and Proposed BMPs/Facilities  Maintain Protective BMPs / Manage Project MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION  Stabilize exposed surfaces  Remove and restore Temporary ESC Facilities  Clean and remove all silt and debris, ensure operation of Permanent BMPs/Facilities, restore operation of BMPs/Facilities as necessary  Flag limits of sensitive areas and open space preservation areas  Other _______________________ Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Type/Description Water Quality Type/Description  Detention  Infiltration  Regional Facility  Shared Facility  On-site BMPs  Other ________________ ________________ ________________ ________________ ________________ ________________  Vegetated Flowpath  Wetpool  Filtration  Oil Control  Spill Control  On-site BMPs  Other ________________ ________________ ________________ ________________ ________________ ________________ ________________ Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS  Drainage Easement  Covenant  Native Growth Protection Covenant  Tract  Other ____________________________  Cast in Place Vault  Retaining Wall  Rockery > 4′ High  Structural on Steep Slope  Other _______________________________ X X INFILTRATION TRENCH X X X X X X X X X X REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 12/12/2016 2017 City of Renton Surface Water Design Manual 8-A-6 Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attached Technical Information Report. To the best of my knowledge the information provided here is accurate. ____________________________________________________________________________________ Signed/Date 10/6/2021 TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 12 of 46 Figure 1.2 – Site Location Source: google.com/maps TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 13 of 46 Figure 1.3 – Aerial Site Photo TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 14 of 46 EXISTING AND DEVELOPED CONDTIONS Development includes two new single-family residential projects with attached garages on separate King County Tax lots: 334210-2885 and 334210-2890 within the City of Renton. These two lots were segregated in 2021. The existing single family development improvements were removed in 2021 from both lots in preparation for this development. Runoff from the proposed impervious surfaces for each lot will be managed separately with an onsite infiltration facility under the proposed driveway for each lot. A small amount of runoff for the uncovered patio at the north end of the site will not be collected and is modeled as bypass. Existing impervious areas and proposed impervious areas are summarized in Figure 1.4 below, followed by the Existing Conditions Map in Figure 1.5 and the Developed Basin Map in Figure 1.6. Figure 1.4 – Developed and Existing Basin Area Summary Developed Basin Area Summary Existing Basin Area Summary Surface No. Description Hard Surface Area (SF) Area (Acres) Pevious Surface Area (SF) Area (Acres) Description Area (SF) Area (Acres) 1E Roof 2,497 0.05732 - Roof-Residence 1720.6 0.03950 2E Driveway (flat)434 0.00996 - - Roof-Garage 585.7 0.01345 3.1E Walk/Steps (flat)69 0.00159 - - Roof-Shed 74.6 0.00171 3.2E Walk/Steps (flat) Bypass 24 0.00055 Total Roof Area 2380.9 0.05466 EAST Onsite Impervious Total 3,024 0.06942 Onsite Walk/wall 572.0 0.01313 1W Roof 2,497 0.05732 Patio 354.0 0.00813 2W Driveway (flat)434 0.00996 Patio 128.2 0.00294 3.1W Walk/Steps (flat)70 0.00161 Offsite Wall 30.7 0.00070 3.2W Walk/Steps (flat) Bypass 24 0.00055 Total Walk (flat)1084.9 0.02491 WEST Onsite Impervious Total 3,025 0.06944 Onsite Divewaway 415.0 0.00953 4 Sidwealk/Wall (flat)338 0.00776 Offsite Driveway 389.9 0.00895 5 TEMP Walk (flat) 82 0.00188 - - Road 200.0 0.00459 6 Street curb and gutter/pavement 408 0.00937 - - Total Drive 1,005 0.02307 7 Driveway and gutter 596 0.01368 - - Total Impervious (lawn)4,470.70 0.10263 Onsite Pervious (Pasture Flat)- - 4,610 0.10584 Total Pervious Area 8,026 0.18424 Planter Strip (Pasture Flat)- - 413 0.00948 TOTAL New/Replaced 7,473 0.17156 5,023 0.11532 Target Impervious Surface Area 7,473 0.17156 - - Total Impervious and Pervious Area 12,496 0.28688 0.18424 12,496 0.28688 TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 15 of 46 Figure 1.5 – Existing Basin Map 20'-0"MIN REAR YARD5'-0" MIN SIDE YARD 5'-0" MIN SIDE YARD 5'-0" MIN SIDE YARD 5'-0" MIN SIDE YARD20'-0"MIN REAR YARDDN DN DN COVERED PATIO 166.47' PROPOSED SINGLE-FAMILY RESIDENCE ENTRY PROPOSED 2-CAR GARAGE 1ST FLOOR 166.67' COVERED PORCH 166.47' GARAGE 163.0' 166.1' N 166.1' E 165.0' N 165.0' E 164.7' N 164.7' E 165.8' N 165.8' E 162.7' N 162.7' E DN DN DN PROPOSED SINGLE-FAMILY RESIDENCE PROPOSED 2-CAR GARAGE COVERED PATIO 163.8' ENTRY 1ST FLOOR 164.0' 163.8' GARAGE 161.5' 163.0' N 163.0' E 161.8 N 161.8' E 161.6' N 161.6' E 162.7' N 162.7' E 161.3' N 160.8' E ROOF ABOVE ROOF ABOVE INCLUDING GUTTERS COVERED PORCH 163.8' E CONCRETE PORCH CONCRETE PORCH 6" SSCO BACKFLOWPREVENTION DEVICE 6" SSCO 4" SSCO RIM 161.1 IE 157.78 BACKFLOW PREVENTION DEVICE 4" SSCO RIM 162.7 IE 159.3 SURFACE 1E - ROOF: 2497 SF SURFACE 2E - DRIVEWAY (FLAT): 434 SF SURFACE 3.1E - WALK/STEPS (FLAT): 69 SF SURFACE 1W - ROOF: 2497 SF SURFACE 2W - DRIVEWAY (FLAT): 434 SF SURFACE 3.1W - WALK/STEPS (FLAT): 70 SF SURFACE 4 - SIDEWALK/WALL (FLAT): 338 SF SURFACE 5 - TEMP WALK: 82 SF SURFACE 6 - STREET CURB AND GUTTER/PAVEMENT: 408 SF SURFACE 7 - DRIVEWAY: 596 SF 230 SF FOOTPRINT (23-FT X 10-FT) INFILTRATION TRENCH PER DETAILS WITH OBSERVATION WELL (OW)/CLEANOUT (CO) WHERE INDICATED. REFER TO RENTON STD. PLAN 225.20 WITH MODIFICATIONS INDICATED. DEPTH OF ROCK TO BE 4-FT WITH MINIMUM 1' OF COVER OVER TRENCH. TOP OF ROCK ELEVATION 158.8 FT 230 SF FOOTPRINT (23-FT X 10-FT) INFILTRATION TRENCH PER DETAILS WITH OBSERVATION WELL (OW)/CLEANOUT (CO) WHERE INDICATED. REFER TO RENTON STD. PLAN 225.20 WITH MODIFICATIONS INDICATED. DEPTH OF ROCK TO BE 4-FT WITH MINIMUM 1' OF COVER OVER TRENCH. TOP OF ROCK ELEVATION 159.1 FT OW 4" SSCO RIM 161.3 IE 157.9 CO OW CO 20' MIN. FRONT YARD 1.5' DEDICATION 20' MIN. FRONT YARD CB#1W - 24" NYLOPLAST RIM 159.57 W/ GRATE FOR OVERFLOW IE-IN/OUT ~157.0 (6" W,N) IE-IN 157.2 (4" FD N, 4" E) MIN. 12" SUMP BELOW BOT. OF TEE TO ADDRESS BUOYANCY DRILL SIXTEEN 5/8" HOLES IN BOTTOM AND PROVIDE MIN. 12" WASHED ROCK BELOW STRUCTURE CB#1E - 24" NYLOPLAST RIM 161.0 W/ GRATE FOR OVERFLOW IE-IN/OUT 158.4 (6" W, N) IE-IN 158.6 (4" FD-N) IE-IN 158.6 (4" E) MIN. 12" SUMP BELOW BOT. OF TEE TO ADDRESS BUOYANCY DRILL SIXTEEN 5/8" HOLES IN BOTTOM AND PROVIDE MIN. 12" WASHED ROCK BELOW STRUCTURE NEW 4"x8" CONNECTION 6" IE ~150.10 8" IE ~149.58 CONC. 8" DIP W.M. BOP ~157.5 6" SS TOP~156.0 MAX (1.50' MIN. VERTICAL SEPARATION) 161.74160.31 161.14159.72 2" TRENCH DRAIN 2" TRENCH DRAIN SET FOOTING DRAIN INVERT 0.5' ABOVE CB#1W RIM ELEVATION OR PROVIDE SUMP PUMP SET FOOTING DRAIN INVERT 0.5' ABOVE CB#1E RIM ELEVATION OR PROVIDE SUMP PUMP SURFACE 3.2W [BYPASS] - WALK/STEPS (FLAT): 24 SF SURFACE 3.2E [BYPASS]- WALK/STEPS (FLAT): 24 SF 5.41' 5.41'5.12'3.62'6.62'1.5' DEDICATION 8.12' SCALE IN FEET 10 5 0 10 20 PLOTTED: 12/10/2021 2:26:04 PM FILE: E21027C-DEV BASIN.DWG LAST SAVED BY: ANDYEDATE DESCRIPTION ©2021 THIRD DAY DESIGN, LLC. All rights reserved. No part of this document may bereproduced in any form without permission from Third Day Design, LLC. # THIRD DAY DESIGN 5918 WALLER RD E TACOMA, WA 98443 (253) 256-1812 CIVIL ENGINEERING 44221 DESIGNED CHECKED DRAWN CHECKED PERMIT21027 12/10/2021 DEVELOPED BASIN MAP FIG. 1.6 STRAIGHT ARROW HOMES N 35ND ST SFR 1218 N 35TH ST RENTON, WA 98056 PERMIT S32 -T 24 -R5 PARK AVE NN 35TH STREET TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 17 of 46 Section 2 – Conditions and Requirements Summary Drainage Review Type Project is subject to Direct Drainage Review per Figure 2.1 below, since it is a single-family residential project that will exceed the thresholds for simplified drainage review. Project is therefore subject to: · All nine core requirements; and · All five special requirements. Definitions from RSWDM Section 1.1 Aquifer Protection Area (APA) means the portion of an aquifer within the zone of capture and recharge area for a well or well field owned or operated by the City of Renton delineated in the Aquifer Protection map found in the City of Renton Map Gallery (<http://rentonwa.gov/government/default.aspx?id=29885>) or viewed via COR Maps (<http://rp.rentonwa.gov/SilverlightPublic/Viewer.html?Viewer=COR-Maps>). Impervious surface means a non-vegetated surface area that either prevents or retards the entry of water into the soil mantle as under natural conditions before development; or that causes water to run off the surface in greater quantities or at an increased rate of flow compared to the flow present under natural conditions prior to development (see also new impervious surface). Common impervious surfaces include, but are not limited to, roof, walkways, patios, driveways, parking lots, or storage areas, areas that are paved, graveled or made of packed or oiled earthen materials or other surfaces that similarly impede the natural infiltration of surface water or stormwater. For the purposes of applying the impervious surface thresholds and exemptions contained in this manual, permeable pavement, vegetated roofs, and pervious surfaces with underdrains designed to collect stormwater runoff are considered impervious surface while an open uncovered flow control or water quality facility is not. However, for the purposes of computing runoff, uncovered flow control or water quality facilities shall be modeled as impervious surfaces as specified in Chapter 3 New impervious surface means the addition of a man-made, modified, or compacted surface like roofs, pavement, gravel, or dirt; or the addition of a more compacted surface, such as resurfacing by upgrading from dirt to gravel, asphalt, or concrete; upgrading from gravel to asphalt, or concrete; or upgrading from a bituminous surface treatment (“chip seal”) to asphalt or concrete. Permeable pavement and vegetated roofs are considered new impervious surface for purposes of determining whether the thresholds for application of minimum requirements are exceeded, as are lawns, landscaping, sports fields, golf courses, and other areas that have modified runoff characteristics resulting from the addition of underdrains designed to collect stormwater runoff. Open, uncovered retention/detention facilities shall not be considered impervious surfaces for purposes of determining whether the thresholds for application of minimum requirements are exceeded. Open, uncovered retention/detention facilities shall be considered impervious surfaces for purposes of runoff modeling. New pervious surface means the conversion of a native vegetated surface or other native surface to a nonnative pervious surface (e.g., conversion of forest or meadow to pasture land, grass land, cultivated land, lawn, landscaping, bare soil, etc.), or any alteration of existing nonnative pervious surface that significantly increases surface and storm water runoff (e.g., conversion of pasture land, grass land, or cultivated land to lawn, landscaping, or bare soil; or alteration of soil characteristics). TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 18 of 46 Project means any proposed action to alter or develop a site. The proposed action of a permit application or an approval, which requires drainage review. Project site means that portion of a site and any offsite areas subject to proposed project activities, alterations, and improvements including those required by this manual. Replaced impervious surface means any existing impervious surface on the project site that is proposed to be removed and re-established as impervious surface, excluding impervious surface removed for the sole purpose of installing utilities or performing maintenance on underground infrastructure. For structures, removed means the removal of buildings down to the foundation. For other impervious surfaces, removed means the removal down to base course or bare soil. For purposes of this definition, base course is the layer of crushed rock that typically underlies an asphalt or concrete pavement. It does not include the removal of pavement material through grinding or other surface modification unless the entire layer of PCC or AC is removed. Replaced impervious surface also includes impervious surface that is moved from one location to another on the project site where the following two conditions are met: (A) runoff characteristics and volumes remain the same or are improved in the area where the existing impervious surface is removed , and (B) impervious surface at the new location is either designated as non-pollution generating or the pollution generating characteristics remain unchanged compared to that of the original location. Site means a single parcel; or, two or more contiguous parcels that are under common ownership or documented legal control; or a portion of a single parcel under documented legal control separate from the remaining parcel, used as a single parcel for a proposed project for purposes of applying for authority from the City to carry out a proposed project. For projects located primarily within dedicated rights-of-way, the length of the project site and the right-of-way boundaries define the site. Target surface area means a developed surface from which runoff impacts are required to be mitigated by a particular set of drainage requirements. Target impervious surface means that portion of a site’s new and/or replaced impervious surface from which runoff impacts are required to be mitigated by a particular set of drainage requirements (flow control facility, water quality facility, and/or on-site BMP). TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 19 of 46 Figure 2.1 – Renton Surface Water Design Manual Flow Chart for Determining Type of Drainge Review Required TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 20 of 46 Core Requirement #1: Discharge at the Natural Location Runoff from the proposed development will continue to discharge to N 35th St, which is the natural discharge location for this site. The site is not within a mapped landslide hazard area. Refer to the Level 1 Downstream Analysis under Section 3 of this TIR for a complete description of the downstream drainage system. Core Requirement #2: Offsite Analysis Core Requirement #2 is applicable to the entire project per CRSWDM Section 1.2.2. An offsite analysis is provided in Section 3 of this report. Core Requirement #3: Flow Control Per CRSWDM Section 1.2.3, this project does not meet the basic exemption from flow control since it does not result in less than 5,000 Sf of new plus replaced impervious surface area. Per the City of Renton Flow Control Applications Map, adopted in Reference Section 15-A of the CRSWDM (which may also be viewed via COR Maps online), this project site is under the Peak Rate Flow Control Standard – ‘Matching Existing site conditions 2, 10 and 100-year peak-rate runoff for areas draining to constructed (man-made) or highly modified drainage systems so as not to create a downstream flooding problem.’ Per Section 1.2.3.1.A (CRSWDM pg. 1-40), the following exceptions (exception #2) applies only in the Peak Rate Flow Control Standard Areas: Runoff from the target surfaces will increase 100-year flows less than 0.15 cfs (when modeled using 15- minute time steps) compared to the existing. The project will result in a net decrease in cfs for the 100- year compared to the existing flows. Refer to Section 4 for additional detail. Core Requirement #4: Conveyance System Core requirement #4 is applicable to the project. The conveyance system is limited to the onsite conveyance system which directs runoff to the proposed onsite infiltration trench. Conveyance system analysis will be provided if required by the City of Renton. Core Requirement #5: CSWPP Core Requirement #5 is applicable to the project per CRSWDM Section 1.2.5. Temporary erosion and sediment control (TESC) plans providing details on best management practices (BMPs) to be implemented during construction are included for each building permit application. Refer to Section 8 for the remainder of the Construction Stormwater Pollution Prevention Analysis and Design, including Stormwater Pollution Prevention and Spill (SWPPS) measures. Core Requirement #6: Maintenance and Operations Core Requirement #6 is applicable to the project per KCSWDM Section 1.2.6. Operation and maintenance manual has been prepared and is provided in Appendix C. TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 21 of 46 Core Requirement #7: Financial Guarantees and Liability The owner will provide any financial guarantees and liabilities required by the right-of-way permit. Core Requirement #8: Water Quality Facilities Core Requirement #8 is not applicable to the project per the Surface Area Exemption #1 in CRSWDM Section 1.2.8. The improvements include less than 5,000 square feet of new or replaced pollution- generating impervious surfaces (PGIS). Core Requirement #9: Flow Control BMPs The developer has opted to satisfy this requirement through option 2, using a continuous runoff model to demonstrate compliance with the Low Impact Development (LID) Performance Standard. The LID Performance Standard is defined as follows: For the target surfaces subject to Core Requirement #9, Stormwater discharges shall match developed discharge durations to pre-developed durations for the range of pre-developed discharge rates from 8% of the 2-year peak flow to 50% of the 2-year peak flow. Assume historical site conditions as the predeveloped condition.  This is addressed for all target onsite imperious surfaces with via an infiltration trench for each lot. Note that a small amount of runoff from the uncovered portion of the porch will bypass the trench and is modeled in WWHM as bypass. Additionally, projects that opt to demonstrate compliance with the LID Performance Standard using a continuous runoff model must protect the soil moisture capacity of new pervious in accordance with the soil amendment BMP as detailed in Appendix C, Section C.2.13. This requirement for soil moisture capacity is addressed on the TESC Plan. Special Requirement #1: Other Adopted Areas-Specific Requirement Special Requirement #1 is not applicable to the project per RSWDM Section 1.3.1, as there are no other adopted area-specific requirements. Special Requirement #2: Flood Hazard Area Delineation Special Requirement #2 is not applicable to the project per RSWDM Section 1.3.2, as the site is not located in or adjacent to the 100-year flood plain. Special Requirement #3: Flood Protection Facility Special Requirement #3 is not applicable to the project per RSWDM Section 1.3.3. The project site does not rely on an existing flood protection facility (such as a levee or revetment) for protection against hazards, nor does the project site modify or construct a new flood protection facility. Special Requirement #4: Source Control Special Requirement #4 is not applicable to the project per RSWDM Section 1.3.4 since this is a single- family residential project. Special Requirement #5: Oil Control Special Requirement #5 is not applicable to the project per RSWDM Section 1.3.5, as this project site does not have characteristics of a high-use site, nor is it an existing high-use site. Per the RSWDM, a high-use site is defined as a commercial or industrial site that (1) has an expected average daily traffic (ADT) count equal to or greater than 100 vehicles per 1,000 square feet or gross building area; (2) is subject to TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 22 of 46 petroleum storage or transfer in excess of 1,500 gallons per year, not including delivered heating oil; or (3) is subject to use, storage, or maintenance of a fleet of 25 or more diesel vehicles that are over 10 tons net weight (trucks, buses, trains, heavy equipment, etc.). For this definition, commercial and industrial site means that portion of a site’s developed area associated with an individual commercial or industrial business. Special Requirement #6: Aquifer Protection Area Special Requirement #6 is not applicable to the project per RSWDM Section 1.3.6 since the site is located just outside of Wellhead Protection Area – Zone 2. If the project where within this zone, Per CRSWDM liners are required for open flow control facilities, such as ponds, as well as conveyance ditches that will convey pollution generating surfaces. No such facilities are proposed for this development; therefore, the liner requirement is not applicable. Section 3 – Offsite Analysis A Level 1 Analysis of the downstream conditions has been completed, per Core Requirement #2, Section 1.2.2 of 2017 CRSWDM. As required, both downstream and upstream conditions were analyzed qualitatively. TASK 1 – Define and Map the Study Area The study area includes N 35th St from the project site approximately a quarter mile downstream where the City of the Renton stormwater conveyance system discharges into Lake Washington. A downstream map is provided in Figure 3.1 below. TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 23 of 46 Figure 3.1 – Downstream Map TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 24 of 46 TASK 2 – Review All Available Information on the Study Area The City of Renton COR Maps website as well as King County iMap were reviewed for the surrounding and downstream study area. Based on King County iMap there are no drainage complaints for this area. Based on City of Renton COR Map, there are moderate to high landslide hazard areas within the downstream study area, as shown in Figure 3.2. TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 25 of 46 Figure 3.2 – City of Renton Critical Areas Map TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 26 of 46 TASK 3 – Field Inspect the Study Area A field investigation was completed by` Third Day Design on August 3, 2021, as part of the downstream analysis. The onsite drainage patterns within the project site were observed. Refer to Task 4 below for a detailed description of the downstream drainage system and analysis. TASK 4 – Describe the drainage system, and its existing and predicted drainage and water quality problems. Runoff from the site, including runoff from the onsite lawn, driveway, walks and roof runoff, drains to the south into N 35th Street. N 35th Street is a crowned road that does not include a piped conveyance system. Instead, runoff in the street is conveyed via gutter flow via the asphalt wedge curb along the north side of the street to the city’s drainage system in Burnette Ave N. Runoff from the north side of 35th is collected in the catch basin shown in Photo C, then conveyed via 12” pipe immediately to a ditch on the east side of Burnette (Photo D). The ditch is quickly transitioned to a 12” piped conveyance system to the north side of N 36th Street and continues via 12” pipe to the west side of Lake Washington Boulevard where the system discharges via pipe to Lake Washington on the north end of Kennydale Beach Park (Photo E). No storm drainage system or flooding problems system problems were observed during the visit. Neither were any erosion or landslide hazard concerns observed. Photographs from the site visit are included below and the letters correspond to the letters indicated on Figure 3.1. Photo A – N 35th St, Adjacent to the project site, looking West: TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 27 of 46 Photo B – N 35th St, mid-block, looking West: TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 28 of 46 Photo C – NE corner of N 35th St / Burnette Ave N, drainage inlet: Photo D – Existing Conveyance ditch on the east side of Burnette Ave N: TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 29 of 46 Photo E – Discharge to Lake Washington at north end of Kennydale Beach Park TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 30 of 46 Section 4 – Flow Control, LID and WQ Facility Analysis and Design PART A: EXISTING SITE HYDROLOGY The existing development was modeled in WWHM 2012 per the areas described and delineated in Section 1, Figure 1.5. In the WWHM model, this basin was and assigned Point of Compliance 3 (POC 3) for comparing to the developed runoff condition. The pre-developed (forested) condition was also modeled in WWHM for each individual onsite lot and assigned POC 1 (east) and POC 2 (west), for the east lot and west lot, respectively. This condition was modeled for sizing the infiltration trenches to meet the LID performance standard. PART B: DEVELOPED SITE HYDROLOGY The developed conditions were modeled for each lot per Section 1, Figure 1.6 for sizing the infiltration trench to meet the LID performance standard. The fully developed condition, including the street improvements was also modeled in WWHM 2012 and assigned POC 3 for comparing to the existing conditions to verify that the project is exempt from flow control. Developed POC 3 is conservative since it does not include the benefits of the proposed infiltration systems. PART C: PERFORMANCE STANDARDS The infiltration trench for each site was sized using WWHM 2012 to meet the LID performance standard. The pre-developed condition for this analysis was defined as the historical (forested) condition. Per the WWHM Report in Appendix E, the infiltration facility passed the LID performance standard (for the historical flows from 8% of the 2-year peak flow to 50% of the 2-year peak flow) for each site. TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 31 of 46 The infiltration trench for the east lot was modeled as follows: The infiltration trench for the west lot was modeled as follows: TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 32 of 46 The required setbacks of 5 ft from adjacent property lines and building is met as shown on the site plan. PART D: FLOW CONTROL SYSTEM Per CRSWDM Section 1.2.3, this project does not meet the basic exemption from flow control since it does not result in less than 5,000 Sf of new plus replaced impervious surface area. Per the City of Renton Flow Control Applications Map, adopted in Reference Section 15-A of the CRSWDM (which may also be viewed via COR Maps online), this project site is under the Peak Rate Flow Control Standard – ‘Matching Existing site conditions 2, 10 and 100-year peak-rate runoff for areas draining to constructed (man-made) or highly modified drainage systems so as not to create a downstream flooding problem.’ Per Section 1.2.3.1.A (CRSWDM pg. 1-40), the following exceptions (exception #2) applies only in the Peak Rate Flow Control Standard Areas: TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 33 of 46 Runoff from the target surfaces will increase 100-year flows less than 0.15 cfs (when modeled using 15- minute time steps) compared to the existing. The project will result in a slight net increase in cfs for the 100-year compared to the existing flows. Per the WWHM Model and Figures 4.1 below, the existing and developed 100-year peak flows are 0.1396 cfs and 0.1397 cfs, respectively. Refer to Appendix E for a copy of the full WWHM data output. Figure 4.1 – Existing vs Developed Peak Flows (POC 3) PART E: WATER QUALITY SYSTEM Core Requirement #8 is not applicable to the project per the Surface Area Exemption #1 in CRSWDM Section 1.2.8. The improvements include less than 5,000 square feet of new or replaced pollution- generating impervious surfaces (PGIS). TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 34 of 46 Section 5 – Conveyance System Analysis and Design The proposed drainage conveyance systems will be adequate to provide stormwater conveyance from the proposed development. Detailed analysis may will be provided if required by the City of Renton. Section 6 – Special Reports and Studies No further reports or studies are anticipated. Section 7 – Other Permits Other than Building permits and a right-of-way permit from the City of Renton, no other permits are anticipated. Section 8 – Construction Stormwater Pollution Prevention Analysis and Design A Construction Stormwater Control Plan following Best Management Practice’s (BMP’s) will be implemented during construction. Following is a summary of some of the BMPs that will be used. The CSWPP Supervisor is the responsible person who will oversee implementation and maintenance. Refer to the plans for proposed construction sequence as well as the CSWPPP that has been prepared for this project. Erosion and Sediment Control (ESC) Measures The following ESC measures are required to minimize erosion and sediment transport offsite: 1. Limits of Disturbance will be marked by fencing or other means on the ground; this will be completed prior to land disturbing activity to protect vegetated areas which do not need to be disturbed with the proposed improvements. 2. Straw, mulch or plastic will be used to cover the site or to provide immediate temporary/short- term protection from erosion. 3. Perimeter Protection: A row of siltation fence is on the downhill sides of the project area; this BMP was selected to provide perimeter protection since site grades will not concentrate flows and site slopes are shallow (less than 10%, which allows for a maximum flow path of up to 250 feet). Flow path lengths max out at about 100 feet. 4. Traffic Area Stabilization: The existing driveway may be used a as stabilized construction exit in lieu of constructing a construction exist. A stabilized exit is required to prevent the tracking sediment offsite. 5. Catch Basin Inserts, which are manufactured device made of filter fabric and nests inside a catch basin, will be placed on catch basin until the site is fully stabilized. This BMP was selected to prevent coarse sediment from entering the storm drainage system and because the contributing basin area to the catch basin are small (significantly less than one acre). 6. Surface Water Collection: Not anticipated during construction. If surface water is collected it should be dispersed across established vegetation. 7. Dewatering: Accumulated water in foundation areas, excavations, and utility trenches shall be removed and disposed of in a manner that does not pollute surface waters or cause downstream erosion or flooding. See "Dewatering Control," Section D.2.1.7 (p. D-66), for detailed specifications. TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 35 of 46 8. Dust Control: Not anticipated. 9. Flow Control: Not applicable since this is a small project site. 10. Control Pollutants: Refer to SWPPS Measures below. 11. Maintain BMPs: BMPs will be maintained by the CSWPP Supervisor or designee per the Renton Surface Water Design manual or DOE BMPs. All BMPs implemented on site must be maintained and repaired until after the site is completely stabilized in order to protect the function of the BMP in erosion control practice. 12. Manage Project: o Site demolition and grading shall be performed after the erosion and sediment control measures have been constructed. o Trenches shall be opened only immediately prior to installation of the stormwater conveyance pipes and the trenches should be backfilled immediately after any required testing or inspections of the installed pipes. Trenching spoils must be treated as other disturbed earthwork and measures should be taken to cover or otherwise stabilize the material, as required. o The Construction SWPPP plan shall be retained on-site or within reasonable access to the site at all times. The CSWPPP plan shall be modified to include any additional or modified BMPs that are deemed necessary to manage erosion and sediment on the site. Revisions to the CSWPPP must be completed within seven days. o Report spillage or discharge of pollutants within 24-hours to the City of Renton. 13. Protect Low Impact Development BMPs: This project includes the following low impact development features and the following protection requirements apply: · Infiltration Trench: prior to construction the infiltration trench areas must be identified and protected using flagging or high visibility fencing, or plywood shall be placed at the surface to prevent over compaction of underlying soils by vehicle traffic. Construction of trench should be completed during a period of dry weather and no sediment laden water shall drain to the trench or underlying subgrade. · Amended Soils: the installation of amended soils should be completed at the end of the project to protect them from sedimentation and over compaction. Stormwater Pollution Prevention and Spill (SWPPS) Measures The following SWPPS measures are required to prevent, reduce or eliminated the discharge of pollutants to onsite or adjacent stormwater systems from construction related activities. 1. Follow effective pollutant handling and disposal procedures. All pollutants, including waste materials and demolition debris that occur on-site during construction shall be handled and disposed of in a manner that does not cause contamination of stormwater. This is necessary to protect site soils and Lake Washington (downstream) and to comply with regulations. 2. Provide cover and containment for materials, fuel and other pollutants. This measure is necessary to protect onsite soils and Lake Washington from petroleum products, asphalt and concrete compounds, hazardous chemicals, etc. A centralized area for storage and maintenance and refueling of construction equipment must be provided onsite and away from Lake Washington. This is anticipated to be provided onsite near the site entrance (away from Lake Washington) at the beginning of construction and may be within the house after the roof is installed. Refer to RSWDM D.2.2.4 for more specific requirements. 3. Manage the project site to maximize pollutant control and minimize pollutant sources. Control of pollutants other than sediments is the responsibility of the CSWPP Supervisor. This oversight of subcontractors and laborer is important to keep the project on track with SWPPS and ESC TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 36 of 46 measures. A CSWPP Supervisor is identified on the plan and will be the primary contact responsible for SWPPS and ESC issues and reporting, coordination with subcontractors and implementation of the CSWPP Plan. Refer to RCSWDM D.2.2.11 for more specific requirements. 4. Protect from spills and drips of petroleum products and other pollutants. This is important since the project drains to a system that discharges to Lake Washington. 5. Avoid overapplication or untimely application of chemicals and fertilizers. This is important since the project drains to a system that discharges to Lake Washington. 6. Prevent or treat contamination of stormwater runoff by pH modifying sources. o Concrete Handling will be employed since this site includes concrete foundation, driveway and walks. Below is a list of pertinent the Design and Installation Specifications from RSWDM: 1. Assure that washout of concrete trucks, chutes, pumps, and internals is performed at an approved off-site location or in designated concrete washout areas. Do not wash out concrete trucks onto the ground, or into storm drains, open ditches, streets, or streams. Refer to BMP D.2.2.2 for information on concrete washout areas. 2. Return unused concrete remaining in the truck and pump to the originating batch plant for recycling. Do not dump excess concrete on site, except in designated concrete washout areas. 3. Wash off hand tools including, but not limited to, screeds, shovels, rakes, floats, and trowels into formed areas only. 4. Wash equipment difficult to move, such as concrete pavers in areas that do not directly drain to natural or constructed stormwater conveyances. 5. Do not allow washdown from areas, such as concrete aggregate driveways, to drain directly to natural or constructed stormwater conveyances. 6. Contain wash water and leftover product in a lined container when no formed areas are available. Dispose of contained concrete in a manner that does not violate ground water or surface water quality standards. 7. Concrete Washout Area will be employed offsite. The developer is planning for washout of concrete trucks to be completed at an approved off-site location, since this is a small lot. Refer to RSDWM D.2.2.2 for specifications, details and maintenance standards. Refer to RSDWM D.2.2. for additional specifications, details and maintenance standards. Section 9 – Bond Quantities, Facility Summaries, and Declaration of Covenant A Declaration of Covenant will be required for individual lot BMPs to address protection and maintenance of BMPs. This has been completed for each lot and is included in Appendix C. Section 10 – Operations and Maintenance Manual An operations and maintenance manual has been prepared and is provided in Appendix D. TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 37 of 46 APPENDICIES TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 38 of 46 APPENDIX A – SURVEY TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 40 of 46 APPENDIX B – GEOTECHNICAL REPORT AND ADDENDUM LETTER PIONEER ENGINEERS, INC. Geotechnical Engineering Earth Science Water Resources ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ P. O. Box 33628Seattle, WA 98133 Phone: (206) 427-9118 Fax: (206) 306-2982 josephwu.pei@gmail.com September 1, 2021 Mr. Brandon Shimizu Straight Arrow Homes, LLC 12015 NE 8th Street, Suite 5 Bellevue, WA 98005 Subject: Geotechnical Evaluation Proposed Two Residences 1218 North 35th Street Renton, Washington Dear Mr. Shimizu: At your request, Pioneer Engineers, Inc. (“PEI”) has explored subsurface conditions with three test pits (“TP-1 through TP-3”), and conducted a small pilot infiltration test (“PIT”) for evaluation of stormwater infiltration at the subject site in Renton, Washington. The site is located approximately 75 feet west of the intersection of North 35th Street and Park Avenue North, where its general location shown in Figure 1. Based on the preliminary architectural site plan prepared by CB Anderson Architects, two single-family residences will be constructed at the site of which each residence consists of a two- or three-story wood framed structure with an attached garage, accessible from North 35th Street. Minor grading is anticipated to establish individual driveways and foundations. SCOPE OF WORK The purpose of this geotechnical evaluation report is to evaluate on-site stormwater infiltration by characterizing subsurface conditions with test pit explorations and a small PIT. To achieve the purpose, the scope of work specifically comprises the following items: 1. Explore subsurface conditions with test pits to a maximum depth of 9 feet. The underlying soils encountered are visually classified; September 1, 2021 Proposed Two Residences PEI Project No. G21A22 Page 2 PIONEER ENGINEERS, INC. 2. Collect soil samples at selected depths and seal them in sampling bags for further examination; 3. Perform a site reconnaissance to observe and document existing surface features; 4. Review geologic and surficial soil conditions by referencing public geologic or soil information; 5. Conduct a small PIT in the area for infiltration of storm runoff; 6. Prepare a written report to present the findings from subsurface exploration and recommendations for grading and site preparation, structural fill and compaction, and evaluation of on-site stormwater infiltration. SITE CONDITIONS Surface Conditions The site is a developed property rectangular in shape, bounded to the south by North 35th Street and adjoins private properties on the other three sides. It is measured 100.1 feet along the street and 180 feet in depth, encompassing an area of 0.41 acre. A vertical relief of 6 feet stretches about 100 feet horizontally. In a broad view of topography, the site is situated in the mid-hill of a regional slope descending westerly to Lake Washington. Locally within the site, the ground surface slopes down mildly toward southwest. All existing structures have been removed. Geologic Mapping A geologic map, Geologic Map of Surficial Deposits in the Seattle 30’ x 60’ Quadrangle, Washington, prepared by James C. Yount, James P. Minard and Glenn R. Dembroff in 1993 was referenced for the geologic and soil conditions at the site. According to this map, the site is mapped in a soil unit of Vashon recessional outwash (“Qvr”) deposits, closely underlain by Vashon till (“Qvt”) deposits. Qvr was deposited mostly from the meltwater flowing from the retreating glaciers during the last glaciation period, consisting of poorly to moderately sorted and stratified gravel and sand with local inclusions of silt and clay. Qvt was deposited directly by glacial ice during the most recent September 1, 2021 Proposed Two Residences PEI Project No. G21A22 Page 3 PIONEER ENGINEERS, INC. glaciation as it advanced over an eroded, irregular surface of older formations and sediments. It is a very dense mixture of unsorted clay, silt, sand, gravel, and scattered cobbles and boulders, locally referred to as "hard pan.” Subsurface Exploration On July 20, 2021, subsurface conditions were explored with two test pits to a maximum depth of 8 feet. Per the owner’s request, a small PIT was conducted in an additional pit (“P-1”) between these pits on August 3, 2021. All pits were excavated using a track-mounted excavator (Caterpillar 303.5E2 CR) provided by the owner. On August 18, 2021, an additional test pit, TP- 3, was excavated to assure the consistency of subsurface conditions in the southern portion of the site and the applicability of PIT result in this area. Locations of all pits were determined by tape measuring with reference to existing surface features, with their approximate locations shown in Figure 2. Subsurface exploration was continuously monitored by an engineer from our firm who documented the underlying soil and groundwater conditions encountered, maintained a log of each pit, obtained representative soil samples, and observed pertinent site features. The final test pit logs represent our interpretations of subsurface conditions explored. The stratification lines in the logs indicate approximate boundaries between soil types. Actual transitions may be more gradual in the natural geologic setting. The soils encountered are visually classified in general accordance with Unified Soil Classification System (“USCS”) of which the chart is shown in Figure 3, with reference to USDA Textural Triangle Classification System. Subsurface Soils All test pits encountered considerably consistent soil conditions: three inches of topsoil or 4 inches of concrete slab, underlain by loose fill containing brown to light-brown, silty, fine sand with prior demolition debris and a trace of coarse gravel. Underlying this fill was weathered Vashon till of light gray, silty, fine sand with a trace of coarse gravel, occasional cobble. Denseness appeared to increase with depth in till deposits. More detailed soil information is presented in Figures 4 and 5. September 1, 2021 Proposed Two Residences PEI Project No. G21A22 Page 4 PIONEER ENGINEERS, INC. Groundwater Conditions No groundwater was encountered in the test pits during exploration. In general, groundwater levels and amount fluctuate with seasons, depending on the amount of precipitation and surface runoff, denseness of groundcover, purpose of land use, and other factors. CONCLUSIONS AND RECOMMENDATIONS Based on the soil and groundwater conditions encountered in subsurface exploration and the result of PIT, it is PEI’s opinion that, from a geotechnical engineering viewpoint, the site may be able to bolster infiltration for management of collective storm runoff if this application is not precluded by space constraints. PEI recommends that an infiltration trench or multiple be used for on-site stormwater management, since it is one of the best management practices (“BMPs”) of low impact development (“LID”) which has an application priority higher than a conventional stormwater facility. The result of PIT can be applied in the entire site due to the consistency of subsurface soil and groundwater conditions. GRADING AND SITE PREPARATION Site preparation includes clearing and removal of ground features, and implementations of temporary erosion and sediment control (“TESC”) measures. Clearing of ground includes removal of existing structures and stripping and grubbing of surface vegetation within the clearing limits. Occasional overexcavation may be required when local weak soil pockets encountered. Overexcavation should be backfilled with structural fill and compacted to a stable condition. On-site topsoil is unsuitable for use in any structural areas. This soil should be disposed of at approved locations or used solely for landscaping purposes. Prior to starting construction activities, a silt fence should be installed along the lower boundary of the site. This fence may be implemented with a highly visible grid fence to delineate the clearing limits. The entrance, parking, and loading areas should be paved with a minimum 12- inch-thick layer of quarry spalls, underlain by non-woven geotextile to prevent sediments from being tracked onto the street. The silt fence and spall pad serve as TESC measures during September 1, 2021 Proposed Two Residences PEI Project No. G21A22 Page 5 PIONEER ENGINEERS, INC. construction. They should remain in place until full establishment of permanent ESC measures. The following strategies and methods should be implemented in the grading phase to enhance TESC measures and site stability during construction:  The bare and disturbed ground outside the clearing limits should be protected with a layer of straw mulch (a minimum thickness of 2 inches; about 2 bales per 1,000 square feet of land) during any period of precipitation, in order to minimize soil erosion by storm runoff. Straw needs to be air-dried and free of any undesirable weed or coarse material.  Cut/fill slopes and stockpiles of soils should be covered with durable plastic sheeting weighed down by securely-anchored sand bags if they are to remain unworked for more than 12 hours; other disturbed areas should be covered with straw mulch as addressed above if they are to remain unworked for more than 2 days.  TESC measures in place should have regular inspection weekly and more frequent inspection immediately before, during and after significant precipitation events. STRUCTURAL FILL AND COMPACTION Structural fill is the material placed under footings, on-grade slabs and pavements where it withstands loading. Structural fill should be free of organic, construction debris and other deleterious substances. It should consist of clean soils with individual particles not greater than 3 inches in size. On-site till deposits containing a significant quantity of fines (silt and clay particles) are difficult to be compacted to meet the criteria in wet weather. Free-draining granular materials such as 2-inch-minus washed rock containing no more than 5 percent of fines can be used in structural areas. Recycled concrete may be used as structural fill provided that the requirements of 9-03.12(2) of the latest Washington State Department of Transportation (“WSDOT”) standard specifications are met. September 1, 2021 Proposed Two Residences PEI Project No. G21A22 Page 6 PIONEER ENGINEERS, INC. With the exception of washed rock (drain fill) in the infiltration trench, structural fill should be placed per loose lift not more than 12 inches in thickness, and compacted to meet the required percentage of maximum dry density determined by ASTM D1557 (Modified Proctor Method) as summarized in the following table: Applicable Area Maximum Dry Soil Density Storm Trench Backfill 95% for upper 2 feet, 90% below Controlled Density Fill (“CDF”) may be used as an alternative for structural fill. CDF (a flowable, self-compacting, rigid-setting and low-density material) is generally used in overexcavation in a foundation or utility trench. Wherever applicable, neither compaction efforts are required to densify this fill, nor density tests needed to ensure the adequacy of compaction efforts. This material’s flowability enables it to access difficult spots and displace standing water in the trench. CDF has a typical slump of 10 inches and a 30-day compressive strength of 200 pounds per square inch (“psi”) or less. Low compressive strength allows CDF for convenient excavation in case of any design alteration during construction. STORMWATER INFILTRATION In accordance with City of Renton Surface Water Design Manual (“CORSWDM”) issued December 12, 2016, LID is “a stormwater and land use management strategy that strives to mimic pre-disturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration by emphasizing conservation and use of on-site natural features, site planning and distributed stormwater management practices that are integrated into a project design.” In recent years, this strategy has been applied primarily to prevent potential pollutants from entering natural water bodies and to reduce the amount of stormwater into a public storm drainage system. To achieve the objectives, LID measures consisting mainly of drywells, infiltration trenches, green roofs, bioretention cells, stormwater harvesting devices and pervious pavements have been widely used to enhance safety of water environment, street landscape and urban amenities. These measures have higher application priority than conventional (structural) stormwater management practices such as detention vaults or pipes. They are taken September 1, 2021 Proposed Two Residences PEI Project No. G21A22 Page 7 PIONEER ENGINEERS, INC. into consideration prior to application of conventional practices. In the CORSWDM, the application priority of such flow control BMPs and LID measures is full dispersion, full infiltration, limited infiltration, and basic dispersion in sequence. PIT and Result The infiltration test was conducted at a depth of 5 feet in P-1 with a bottom area of 12 square feet. A plastic splash plate was placed at a corner of the bottom to disperse water and minimize scour. Tap water was carefully dispersed to soak soils in the infiltration zone. A hydraulic head of 12 inches was maintained during this period of time. After soaking, the pit was filled up to have a hydraulic head of 12 inches and the drop of water levels measured over elapsed time to obtain measured infiltration rates. Drops of water levels were taken from the readings at a scaled wood stake accurate to half an inch placed in the middle of the pit. This process was repeated to obtain the final field infiltration rate after a steady-state rate was reached. Measured water levels versus elapsed time were logged, as shown in the table: Soil Elapsed Water Water Level Infiltration Description Time, min. Level, in. Drop, in. Rate, in/hr Light gray, 0 12.0 0.0 fine sand, 30 -- -- -- trace coarse 60 11.7 0.3 0.3 gravel, occasional 90 -- -- -- cobble. 120 11.4 0.3 0.3 The measured infiltration rate of 0.3 in/hr is obtained from the test. This rate is believed to reasonably represent the infiltration rate in weathered Vashon till deposits. Design Infiltration Rate In accordance with the aforementioned design manual, correction was made to account for factors (types of field infiltration tests, Ftesting; the depth from the infiltration facility bottom to the groundwater table, Fgeometry; flow channels plugged by fine particles in soil mass, Fplugging) that September 1, 2021 Proposed Two Residences PEI Project No. G21A22 Page 8 PIONEER ENGINEERS, INC. may affect long-term performance of on-site stormwater infiltration. The correction for the lowest final field infiltration rate in P-1 is summarized below: Idesign = Imeasured x Ftesting x Fgeometry x Fplugging Ftesting = 0.5 (small or large scale PIT) Fgeometry = 4(D/W) + 0.05 = 4(3/3) + 0.05 = 4.05 D: depth from the bottom of the proposed facility to the maximum wet season water table or nearest impervious layer, whichever is less = 3.0 feet (exploration depth) W: width (or diameter) of facility = 3.0 feet (assumed), but Fgeometry ≤ 1.0 Fplugging = 0.75 (sandy loam) Idesign = Imeasured x Ftesting x Fgeometry x Fplugging = (0.3 in/hr)(0.5)(1.0)(0.75) = 0.11 in/hr Therefore, the design infiltration rate is 0.11 in/hr for the facility bottom at 5 feet. Wherever applicable, an infiltration trench or multiple can be used for on-site stormwater management. The setback distance may be reduced to 5 feet from structures provided that no basement or crawl space would be constructed. Trenches should have a minimum clearance of 10 feet when multiple trenches are applied. Infiltration Trench The facility consists of a level perforated PVC pipe with a (cleanout) stand pipe of same size and material at its end. The level pipe should be surrounded by 0.75- to 1.5-inch washed rock wrapped with non-woven geotextile, where the bottom area left open to infiltration subgrade soils. Such subgrade should be scarified or grooved prior to placement of washed rock. LIMITATIONS This report has been prepared for the specific application to this project for the exclusive use of Mr. Brandon Shimizu of Straight Arrow Homes, LLC and his authorized personnel. The conclusions and recommendations in this report, however, should not be construed as a warranty of the subsurface conditions. September 1, 2021 Proposed Two Residences PEI Project No. G21A22 Page 9 PIONEER ENGINEERS, INC. PEI’s recommendations are based on the subsurface conditions encountered in the test pits, in- situ tests and our experience and engineering judgment. The recommendations are professional opinions derived in a manner consistent with the level of care and skill ordinarily exercised by other members of the profession currently practicing under similar conditions in local areas. Respectfully submitted, PIONEER ENGINEERS, INC. Joseph Wu, P.E. Engineering Consultant Five figures included. P-1 TP-1TP-2 TP-3 PROPERTY FROM STANDARD PENETRATION TEST SILTY OR CLAYEY SOILS Relative Density Friction Angle %φ 0 - 15 15 - 35 26 - 30 35 - 65 28 - 35 65 - 85 35 - 42 USCS CHART PROPOSED TWO RESIDENCES 1218 NORTH 35TH STREET Geotechnical Engineering · Earth Science · Water Resources RENTON, WASHINGTON PROJ. NO. G21A22 DATE 9/1/21 FIGURE 3 PIONEER ENGINEERS, INC. SANDY SOILS N Blow Count 0 - 4 4 - 10 10 - 30 Description 30 - 50 Very Loose Loose Medium Dense Dense < 2 Blow Count N Very Soft Description Soft2 - 4 < 0.25 0.25 - 0.50 Unconfined Strength qu, tsf 0.50 - 1.00 1.00 - 2.00 2.00 - 4.00 8 - 15 4 - 8 Very Stiff Medium Stiff Stiff Hard > 50 85 - 100 38 - 46 Very Dense > 4.00 15 - 30 > 30 TEST PIT NO. TP-3 Logged By:JW Date:8/18/21 Depth Sample (N) W USCS Soil Description Blows/ Other Test ft.Type No. ft. % 4" Concrete Slab. Brown to light brown, silty, fine sand, prior demolition debris, loose, dry. (Fill) B1 SM Light gray, silty, fine SAND, trace coarse gravel, trace orange staining, medium-dense, slightly moist. (Vashon Till; Sandy Loam) 5 B2 Test pit terminated @ 9 ft; no groundwater encountered 10 during exploration. TEST PIT NO. Logged By: Date: Depth Sample (N) W USCS Soil Description Blows/ Other Test ft.Type No. ft. % LEGEND: SS - 2" O.D. Split-Spoon Sample GROUNDWATER: Seal ST - 3" O.D. Shelby-Tube Sample Water Level B - Bulk Sample Observation Well Tip TEST PIT LOG PROPOSED TWO RESIDENCES 1218 NORTH 35TH STREET Geotechnical Engineering ꞏ Earth Science ꞏ Water Resources RENTON, WASHINGTON PROJ. NO. G21A22 DATE 9/1/21 FIGURE 5 PIONEER ENGINEERS, INC. TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 41 of 46 APPENDIX C – DECLARATION OF COVENANT Page 1 of ___ Return Address: City Clerk’s Office City of Renton 1055 S Grady Way Renton, WA 98057 DECLARATION OF COVENANT FOR INSPECTION AND MAINTENANCE OF DRAINAGE FACILITIES AND ON-SITE BMPS Grantor: Grantee: City of Renton, a Washington municipal corporation Legal Description: Assessor's Tax Parcel ID#: IN CONSIDERATION of the approved City of Renton (check one of the following) Residential Building Permit Commercial Building Permit Clearing and Grading Permit Civil Construction or Utility Permit for Permit(s)_____________________ (Construction/Building/Utility Permit #) relating to the real property ("Property") described above, the Grantor(s), the owner(s) in fee of that Property, hereby covenants (covenant) with the City of Renton (“City of Renton” or “City”), a municipal corporation of the state of Washington, that he/she (they) will observe, consent to, and abide by the conditions and obligations set forth and described in Paragraphs 1 through 9 below with regard to the Property, and hereby grants (grant) an easement as described in Paragraphs 2 and 3. Grantor(s) hereby grants (grant), covenants (covenant), and agrees (agree) as follows: 1.The Grantor(s) or his/her (their) successors in interest and assigns ("Owners ") shall at their own cost, operate, maintain, and keep in good repair, the Property's drainage facilities constructed as required in the approved construction plans and specifications __________________ (Project Plan #) on file with the City of Renton and submitted to the City of Renton for the review and approval of permit(s) _____________________________ (Construction/Building/Utility Permit #). The Property's drainage facilities are shown and/or listed on Exhibit A – Site Plan. The Property’s drainage facilities shall be maintained in compliance with the operation and maintenance schedule included and attached herein as Exhibit B – Operations and Maintenance. Drainage facilities include pipes, channels, flow control facilities, water quality facilities, on-site best management practices (BMPs) and other engineered structures designed to manage and/or Straight Arrow Homes LLC HILLMANS LK WN GARDEN OF EDEN #1 LOT 28 BLK 20 TGW POR OF VAC ALLEY ADJ (PER CITY OF RENTON DET. OF LEGAL LOT STATUS FILE# LND-40-0043) 3342102890 B21005262 PR21000259 B21005262 9 4 Page 2 of ___ treat stormwater on the Property. On-site BMPs include dispersion and infiltration devices, bioretention, permeable pavements, rainwater harvesting systems, tree retention credit, reduced impervious surface footprint, vegetated roofs and other measures designed to mimic pre-developed hydrology and minimize stormwater runoff on the Property. 2.City of Renton shall have the right to ingress and egress over those portions of the Property necessary to perform inspections of the stormwater facilities and BMPs and conduct maintenance activities specified in this Declaration of Covenant and in accordance with the Renton Municipal Code. City of Renton shall provide at least thirty (30) days’ written notice to the Owners that entry on the Property is planned for the inspection of drainage facilities. After the thirty (30) days, the Owners shall allow the City of Renton to enter for the sole purpose of inspecting drainage facilities. In lieu of inspection by the City, the Owners may elect to engage a licensed civil engineer registered in the state of Washington who has expertise in drainage to inspect the drainage facilities and provide a written report describing their condition. If the engineer option is chosen, the Owners shall provide written notice to the City of Renton within fifteen (15) days of receiving the City’s notice of inspection. Within thirty (30) days of giving this notice, the Owners, or engineer on behalf of the Owners, shall provide the engineer’s report to the City of Renton. If the report is not provided in a timely manner as specified above, the City of Renton may inspect the drainage facilities without further notice. 3.If City of Renton determines from its inspection, or from an engineer’s report provided in accordance with Paragraph 2, that maintenance, repair, restoration, and/or mitigation work is required to be done to any of the drainage facilities, City of Renton shall notify the Owners of the specific maintenance, repair, restoration, and/or mitigation work (“Work”) required pursuant to the Renton Municipal Code. The City shall also set a reasonable deadline for the Owners to complete the Work, or to provide an engineer’s report that verifies completion of the Work. After the deadline has passed, the Owners shall allow the City access to re-inspect the drainage facilities unless an engineer’s report has been provided verifying completion of the Work. If the Work is not completed within the time frame set by the City, the City may initiate an enforcement action and/or perform the Work and hereby is given access to the Property for such purposes. Written notice will be sent to the Owners stating the City’s intention to perform such Work. This Work will not commence until at least seven (7) days after such notice is mailed. If, within the sole discretion of the City, there exists an imminent or present danger, the seven (7) day notice period will be waived and Work will begin immediately. 4.The Owners shall assume all responsibility for the cost of any Work, or any measures taken by the City to address conditions as described in Paragraph 3. Such responsibility shall include reimbursement to the City within thirty (30) days of the receipt of the invoice for any such Work performed. Overdue payments will require payment of interest at the maximum legal rate allowed by RCW 19.52.020 (currently twelve percent (12%)). If the City initiates legal action to enforce this agreement, the prevailing party in such action is entitled to recover reasonable litigation costs and attorney’s fees. 5.The Owners are required to obtain written approval from City of Renton prior to filling, piping, cutting, or removing vegetation (except in routine landscape maintenance) in open vegetated stormwater facilities (such as swales, channels, ditches, ponds, etc.), or performing any alterations or modifications to the drainage facilities referenced in this Declaration of Covenant. 9 Page 3 of ___ 6.Any notice or consent required to be given or otherwise provided for by the provisions of this Agreement shall be effective upon personal delivery, or three (3) days after mailing by Certified Mail, return receipt requested. 7.With regard to the matters addressed herein, this agreement constitutes the entire agreement between the parties, and supersedes all prior discussions, negotiations, and all agreements whatsoever whether oral or written. 8.This Declaration of Covenant is intended to protect the value and desirability and promote efficient and effective management of surface water drainage of the real property described above, and shall inure to the benefit of all the citizens of the City of Renton and its successors and assigns. This Declaration of Covenant shall run with the land and be binding upon Grantor(s), and Grantor's(s') successors in interest, and assigns. 9.This Declaration of Covenant may be terminated by execution of a written agreement by the Owners and the City that is recorded by King County in its real property records. IN WITNESS WHEREOF, this Declaration of Covenant for the Inspection and Maintenance of Drainage Facilities is executed this _____ day of ____________________, 20_____. GRANTOR, owner of the Property GRANTOR, owner of the Property STATE OF WASHINGTON ) COUNTY OF KING )ss. On this day personally appeared before me: , to me known to be the individual(s) described in and who executed the within and foregoing instrument and acknowledged that they signed the same as their free and voluntary act and deed, for the uses and purposes therein stated. Given under my hand and official seal this _____ day of ___________________, 20_____. Printed name Notary Public in and for the State of Washington, residing at My appointment expires 9 EXHIBIT A – ON-SITE BMP SITE PLAN TOTAL LOT/SITE AREA: 73,616 Sf. Ft/1.69 AC PERMIT #: ADDRESS: 7519 NE Q Street, Renton, WA 98111 PARCEL NUMBER: 3322708 NEW/ REPLACED IMPERV. AREA (SF): 6,150 DISTURBED AREA (SF): 36,590 ON-SITE BMP(S) USED: Basic Dispersion (Splash Blocks, Gravel Filled Trenches, and Sheet Flow) 1218 N 35th St, Renton, WA 9805 3,025 SF 334210-2890 5,329 SF (0.12233 AC) Infiltration Trench, Soil Amendment 8096 SF MAINTENANCE INSTRUCTIONS FOR FULL INFILTRATION Your property contains an on-site BMP (best management practice) called “full infiltration,” which was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious surfaces on your property. Full infiltration is a method of soaking runoff from impervious area (such as paved areas and roofs) into the ground. If properly installed and maintained per Appendix A of the City of Renton’s Surface Water Design Manual, full infiltration can manage runoff so that a majority of precipitation events are absorbed. Infiltration devices, such as gravel filled trenches, drywells, and ground surface depressions, facilitate this process by putting runoff in direct contact with the soil and holding the runoff long enough to soak most of it into the ground. To be successful, the soil condition around the infiltration device must be reliably able to soak water into the ground for a reasonable number of years. Infiltration Devices The infiltration devices used on your property include the following as indicated on the site plan (CHECK THE BOX(ES) THAT APPLY): gravel filled trenches, drywells, ground surface depressions. MAINTENANCE RESTRICTIONS The size, placement, and composition of these devices as depicted by the site plan and design details must be maintained and may not be changed without written approval from the City of Renton or through a future development permit from the City of Renton. INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES • Infiltration devices must be inspected annually and after major storm events to identify and repair any physical defects. • Maintenance and operation of the system should focus on ensuring the system’s viability by preventing sediment-laden flows from entering the device. Excessive sedimentation will result in a plugged or non-functioning facility. • If the infiltration device has a catch basin, sediment accumulation must be removed on a yearly basis or more frequently if necessary. • Prolonged ponding around or atop a device may indicate a plugged facility. If the device becomes plugged, it must be replaced. • Keeping the areas that drain to infiltration devices well swept and clean will enhance the longevity of these devices. • For roofs, frequent cleaning of gutters will reduce sediment loads to these devices. X TYPICAL FULL INFILTRATION APPLICATIONS 6" 24" 12" 24" WASHED ROCK 1 12"- 34" LEVEL INFILTRATION TRENCH SECTION ANTS PLAN VIEWNTS SECTION VIEW NTS VARIES A A 6" 6" 4" RIGID OR 6"FLEXIBLEPERFORATEDPIPE CB SUMP w/SOLID LID ROOF DRAIN 4" RIGID OR 6" FLEXIBLEPERFORATED PIPE OVERFLOW SPLASH BLOCK ROOF DRAIN CB SUMP w/SOLID LID 12" FINE MESHSCREEN SETBACKFROMBUILDING5' MIN. 1' MIN.1' MIN. FILTER FABRIC COMPACTED BACKFILL 4" RIGID OR 6" FLEXIBLE PERFORATED PIPE 112" - 34" WASHED ROCK MIN. 1' ABOVE SEASONALHIGH GROUNDWATERTABLE, SEE SECTION C.2.2.2 TRENCH SETBACK FROMBUILDING AS REQUIRED,15' MIN. DRIVEWAY X-SECTION NTS 2' MIN. FILTER STRIPSEE SECTIONS6.3.4 & 6.3.5 18" MIN. 6" MIN. 3/4" TO 1-1/2"WASHED DRAINROCK GRASS OVERFLOW NOTE:SEE C.2.2.3 FOR TRENCH LENGTHS,TRENCH SPACING ANDSITE LIMITATIONS MIN. 1' ABOVESEASONAL HIGHGROUNDWATERTABLE, SEESECTION C.2.2.2 X-SECTION NTS GRASS 2' MIN. 18" MIN. 6" MIN. 3/4" TO 1-1/2"WASHED DRAINROCK OVERFLOW 15' MIN. ASREQUIRED,SEE C.2.2.3 FROM ROOF NS T T S MIN. 1' ABOVESEASONAL HIGHGROUNDWATERTABLE, SEESECTION C.2.2.2 HOUSE FLOW 48 INCH DIAMETERHOLE FILLED WITH 1 12" - 3" WASHEDDRAIN ROCK SECTIONNTS MARK CENTER OF HOLEWITH 1" CAPPED PVCOR OTHER MEANSFLUSH WITH SURFACE ROOF DOWNSPOUT OVERFLOW SPLASH BLOCK TOPSOIL FINE MESH SCREEN MIN. 4" DIA.PVC PIPE SIDES OF HOLELINED WITHFILTER FABRIC CATCH BASIN(YARD DRAIN) 15' MIN. AS REQUIRED, SEE SECTION C.2.2.3 VARIES 1' MIN. MIN. 1' ABOVE SEASONALHIGH GROUNDWATER TABLE,SEE SECTION C.2.2.2 5' MIN. SETBACKFROM BUILDING FLOW PLAN VIEWNTS HOUSE ROOFDOWNSPOUT ROOFDOWNSPOUT CATCH BASIN(YARD DRAIN) 48 INCH DIAMETERHOLE FILLED WITH1 12" - 3" WASHEDDRAIN ROCK MAINTENANCE INSTRUCTIONS FOR SOIL AMENDMENT Your property contains an on-site BMP (best management practice) called “soil amendment,” which was installed to mitigate the stormwater quantity and quality impacts of some or all of the pervious surfaces on your property. Soil amendment is a method of regaining greater stormwater functions in the post development landscape by increasing treatment of pollutants and sediments, and minimizing the need for some landscaping chemicals. To be successful, the soil condition must be able to soak water into the ground for a reasonable number of years. This on-site BMP shall be maintained per Appendix A of the City of Renton’s Surface Water Design Manual. MAINTENANCE RESTRICTIONS The size, placement, and composition of these devices as depicted by the site plan and design details must be maintained and may not be changed without written approval from the City of Renton or through a future development permit from the City of Renton. INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES To be successful, the soil must be able to soak water into the ground for a reasonable number of years. • Return leaf fall and shredded woody materials from the landscape to the site when possible in order to replenish soil nutrients and structure. • On turf areas, “grasscycle” (mulch-mow or leave the clippings) to build turf health. • Maintain 2 to 3 inches of mulch over bare areas in landscape beds. • Re-seed bare turf areas until the vegetation fully covers the ground surface. • Avoid using pesticides (bug and weed killers) which damage the soil. • Where fertilization is needed (mainly turf and annual flower beds), a moderate fertilization program should be used which relies on compost, natural fertilizers, or slow-release synthetic balanced fertilizers. RECORDING REQUIREMENT These on-site BMP maintenance and operation instructions must be recorded as an attachment to the required declaration of covenant and grant of easement per Requirement 3 of Section C.1.3.4 of the City of Renton Surface Water Design Manual. The intent of these instructions is to explain to future property owners, the purpose of the BMP and how it must be maintained and operated. These instructions are intended to be a minimum; the City of Renton may require additional instructions based on site-specific conditions. See the City of Renton’s Surface Water Design Manual website for additional information and updates. Page 6 of ___ LOT 27, BLOCK 20, HILLMANS LAKE WASHINGTON GARDEN OF EDEN ADDITION TO SEATTLE NO.1, ACCORDING TO THE PLAT THEREOF RECORDED IN VOLUME 11 OF PLATS, PAGE 63, IN KING COUNTY, WASHINGTON. TOGETHER WITH THAT PORTION OF VACATED ALLEY ADJACENT, WHICH ATTACHED BY OPERATION OF LAW. EXHIBIT C - LEGAL DESCRIPTION 10 of 10 Page 1 of ___ Return Address: City Clerk’s Office City of Renton 1055 S Grady Way Renton, WA 98057 DECLARATION OF COVENANT FOR INSPECTION AND MAINTENANCE OF DRAINAGE FACILITIES AND ON-SITE BMPS Grantor: Grantee: City of Renton, a Washington municipal corporation Legal Description: Assessor's Tax Parcel ID#: IN CONSIDERATION of the approved City of Renton (check one of the following) Residential Building Permit Commercial Building Permit Clearing and Grading Permit Civil Construction or Utility Permit for Permit(s)_____________________ (Construction/Building/Utility Permit #) relating to the real property ("Property") described above, the Grantor(s), the owner(s) in fee of that Property, hereby covenants (covenant) with the City of Renton (“City of Renton” or “City”), a municipal corporation of the state of Washington, that he/she (they) will observe, consent to, and abide by the conditions and obligations set forth and described in Paragraphs 1 through 9 below with regard to the Property, and hereby grants (grant) an easement as described in Paragraphs 2 and 3. Grantor(s) hereby grants (grant), covenants (covenant), and agrees (agree) as follows: 1.The Grantor(s) or his/her (their) successors in interest and assigns ("Owners ") shall at their own cost, operate, maintain, and keep in good repair, the Property's drainage facilities constructed as required in the approved construction plans and specifications __________________ (Project Plan #) on file with the City of Renton and submitted to the City of Renton for the review and approval of permit(s) _____________________________ (Construction/Building/Utility Permit #). The Property's drainage facilities are shown and/or listed on Exhibit A – Site Plan. The Property’s drainage facilities shall be maintained in compliance with the operation and maintenance schedule included and attached herein as Exhibit B – Operations and Maintenance. Drainage facilities include pipes, channels, flow control facilities, water quality facilities, on-site best management practices (BMPs) and other engineered structures designed to manage and/or Straight Arrow Homes LLC HILLMANS LK WN GARDEN OF EDEN #1 LOT 27 BLK 20 TGW POR OF VAC ALLEY ADJ (PER CITY OF RENTON DET. OF LEGAL LOT STATUS FILE# LND-40-0043) 3342102885 B21005267 PR21000259 B21005267 9 4 Page 2 of ___ treat stormwater on the Property. On-site BMPs include dispersion and infiltration devices, bioretention, permeable pavements, rainwater harvesting systems, tree retention credit, reduced impervious surface footprint, vegetated roofs and other measures designed to mimic pre-developed hydrology and minimize stormwater runoff on the Property. 2.City of Renton shall have the right to ingress and egress over those portions of the Property necessary to perform inspections of the stormwater facilities and BMPs and conduct maintenance activities specified in this Declaration of Covenant and in accordance with the Renton Municipal Code. City of Renton shall provide at least thirty (30) days’ written notice to the Owners that entry on the Property is planned for the inspection of drainage facilities. After the thirty (30) days, the Owners shall allow the City of Renton to enter for the sole purpose of inspecting drainage facilities. In lieu of inspection by the City, the Owners may elect to engage a licensed civil engineer registered in the state of Washington who has expertise in drainage to inspect the drainage facilities and provide a written report describing their condition. If the engineer option is chosen, the Owners shall provide written notice to the City of Renton within fifteen (15) days of receiving the City’s notice of inspection. Within thirty (30) days of giving this notice, the Owners, or engineer on behalf of the Owners, shall provide the engineer’s report to the City of Renton. If the report is not provided in a timely manner as specified above, the City of Renton may inspect the drainage facilities without further notice. 3.If City of Renton determines from its inspection, or from an engineer’s report provided in accordance with Paragraph 2, that maintenance, repair, restoration, and/or mitigation work is required to be done to any of the drainage facilities, City of Renton shall notify the Owners of the specific maintenance, repair, restoration, and/or mitigation work (“Work”) required pursuant to the Renton Municipal Code. The City shall also set a reasonable deadline for the Owners to complete the Work, or to provide an engineer’s report that verifies completion of the Work. After the deadline has passed, the Owners shall allow the City access to re-inspect the drainage facilities unless an engineer’s report has been provided verifying completion of the Work. If the Work is not completed within the time frame set by the City, the City may initiate an enforcement action and/or perform the Work and hereby is given access to the Property for such purposes. Written notice will be sent to the Owners stating the City’s intention to perform such Work. This Work will not commence until at least seven (7) days after such notice is mailed. If, within the sole discretion of the City, there exists an imminent or present danger, the seven (7) day notice period will be waived and Work will begin immediately. 4.The Owners shall assume all responsibility for the cost of any Work, or any measures taken by the City to address conditions as described in Paragraph 3. Such responsibility shall include reimbursement to the City within thirty (30) days of the receipt of the invoice for any such Work performed. Overdue payments will require payment of interest at the maximum legal rate allowed by RCW 19.52.020 (currently twelve percent (12%)). If the City initiates legal action to enforce this agreement, the prevailing party in such action is entitled to recover reasonable litigation costs and attorney’s fees. 5.The Owners are required to obtain written approval from City of Renton prior to filling, piping, cutting, or removing vegetation (except in routine landscape maintenance) in open vegetated stormwater facilities (such as swales, channels, ditches, ponds, etc.), or performing any alterations or modifications to the drainage facilities referenced in this Declaration of Covenant. 9 Page 3 of ___ 6.Any notice or consent required to be given or otherwise provided for by the provisions of this Agreement shall be effective upon personal delivery, or three (3) days after mailing by Certified Mail, return receipt requested. 7.With regard to the matters addressed herein, this agreement constitutes the entire agreement between the parties, and supersedes all prior discussions, negotiations, and all agreements whatsoever whether oral or written. 8.This Declaration of Covenant is intended to protect the value and desirability and promote efficient and effective management of surface water drainage of the real property described above, and shall inure to the benefit of all the citizens of the City of Renton and its successors and assigns. This Declaration of Covenant shall run with the land and be binding upon Grantor(s), and Grantor's(s') successors in interest, and assigns. 9.This Declaration of Covenant may be terminated by execution of a written agreement by the Owners and the City that is recorded by King County in its real property records. IN WITNESS WHEREOF, this Declaration of Covenant for the Inspection and Maintenance of Drainage Facilities is executed this _____ day of ____________________, 20_____. GRANTOR, owner of the Property GRANTOR, owner of the Property STATE OF WASHINGTON ) COUNTY OF KING )ss. On this day personally appeared before me: , to me known to be the individual(s) described in and who executed the within and foregoing instrument and acknowledged that they signed the same as their free and voluntary act and deed, for the uses and purposes therein stated. Given under my hand and official seal this _____ day of ___________________, 20_____. Printed name Notary Public in and for the State of Washington, residing at My appointment expires 9 EXHIBIT A – ON-SITE BMP SITE PLAN TOTAL LOT/SITE AREA: 73,616 Sf. Ft/1.69 AC PERMIT #: ADDRESS: 7519 NE Q Street, Renton, WA 98111 PARCEL NUMBER: 3322708 NEW/ REPLACED IMPERV. AREA (SF): 6,150 DISTURBED AREA (SF): 36,590 ON-SITE BMP(S) USED: Basic Dispersion (Splash Blocks, Gravel Filled Trenches, and Sheet Flow) 1218 N 35th St, Renton, WA 9805 3,024 SF 334210-2885 5,329 SF (0.12233 AC) Infiltration Trench, Soil Amendment 8096 SF MAINTENANCE INSTRUCTIONS FOR FULL INFILTRATION Your property contains an on-site BMP (best management practice) called “full infiltration,” which was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious surfaces on your property. Full infiltration is a method of soaking runoff from impervious area (such as paved areas and roofs) into the ground. If properly installed and maintained per Appendix A of the City of Renton’s Surface Water Design Manual, full infiltration can manage runoff so that a majority of precipitation events are absorbed. Infiltration devices, such as gravel filled trenches, drywells, and ground surface depressions, facilitate this process by putting runoff in direct contact with the soil and holding the runoff long enough to soak most of it into the ground. To be successful, the soil condition around the infiltration device must be reliably able to soak water into the ground for a reasonable number of years. Infiltration Devices The infiltration devices used on your property include the following as indicated on the site plan (CHECK THE BOX(ES) THAT APPLY): gravel filled trenches, drywells, ground surface depressions. MAINTENANCE RESTRICTIONS The size, placement, and composition of these devices as depicted by the site plan and design details must be maintained and may not be changed without written approval from the City of Renton or through a future development permit from the City of Renton. INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES • Infiltration devices must be inspected annually and after major storm events to identify and repair any physical defects. • Maintenance and operation of the system should focus on ensuring the system’s viability by preventing sediment-laden flows from entering the device. Excessive sedimentation will result in a plugged or non-functioning facility. • If the infiltration device has a catch basin, sediment accumulation must be removed on a yearly basis or more frequently if necessary. • Prolonged ponding around or atop a device may indicate a plugged facility. If the device becomes plugged, it must be replaced. • Keeping the areas that drain to infiltration devices well swept and clean will enhance the longevity of these devices. • For roofs, frequent cleaning of gutters will reduce sediment loads to these devices. X TYPICAL FULL INFILTRATION APPLICATIONS 6" 24" 12" 24" WASHED ROCK 1 12"- 34" LEVEL INFILTRATION TRENCH SECTION ANTS PLAN VIEWNTS SECTION VIEW NTS VARIES A A 6" 6" 4" RIGID OR 6"FLEXIBLEPERFORATEDPIPE CB SUMP w/SOLID LID ROOF DRAIN 4" RIGID OR 6" FLEXIBLEPERFORATED PIPE OVERFLOW SPLASH BLOCK ROOF DRAIN CB SUMP w/SOLID LID 12" FINE MESHSCREEN SETBACKFROMBUILDING5' MIN. 1' MIN.1' MIN. FILTER FABRIC COMPACTED BACKFILL 4" RIGID OR 6" FLEXIBLE PERFORATED PIPE 112" - 34" WASHED ROCK MIN. 1' ABOVE SEASONALHIGH GROUNDWATERTABLE, SEE SECTION C.2.2.2 TRENCH SETBACK FROMBUILDING AS REQUIRED,15' MIN. DRIVEWAY X-SECTION NTS 2' MIN. FILTER STRIPSEE SECTIONS6.3.4 & 6.3.5 18" MIN. 6" MIN. 3/4" TO 1-1/2"WASHED DRAINROCK GRASS OVERFLOW NOTE:SEE C.2.2.3 FOR TRENCH LENGTHS,TRENCH SPACING ANDSITE LIMITATIONS MIN. 1' ABOVESEASONAL HIGHGROUNDWATERTABLE, SEESECTION C.2.2.2 X-SECTION NTS GRASS 2' MIN. 18" MIN. 6" MIN. 3/4" TO 1-1/2"WASHED DRAINROCK OVERFLOW 15' MIN. ASREQUIRED,SEE C.2.2.3 FROM ROOF NS T T S MIN. 1' ABOVESEASONAL HIGHGROUNDWATERTABLE, SEESECTION C.2.2.2 HOUSE FLOW 48 INCH DIAMETERHOLE FILLED WITH 1 12" - 3" WASHEDDRAIN ROCK SECTIONNTS MARK CENTER OF HOLEWITH 1" CAPPED PVCOR OTHER MEANSFLUSH WITH SURFACE ROOF DOWNSPOUT OVERFLOW SPLASH BLOCK TOPSOIL FINE MESH SCREEN MIN. 4" DIA.PVC PIPE SIDES OF HOLELINED WITHFILTER FABRIC CATCH BASIN(YARD DRAIN) 15' MIN. AS REQUIRED, SEE SECTION C.2.2.3 VARIES 1' MIN. MIN. 1' ABOVE SEASONALHIGH GROUNDWATER TABLE,SEE SECTION C.2.2.2 5' MIN. SETBACKFROM BUILDING FLOW PLAN VIEWNTS HOUSE ROOFDOWNSPOUT ROOFDOWNSPOUT CATCH BASIN(YARD DRAIN) 48 INCH DIAMETERHOLE FILLED WITH1 12" - 3" WASHEDDRAIN ROCK MAINTENANCE INSTRUCTIONS FOR SOIL AMENDMENT Your property contains an on-site BMP (best management practice) called “soil amendment,” which was installed to mitigate the stormwater quantity and quality impacts of some or all of the pervious surfaces on your property. Soil amendment is a method of regaining greater stormwater functions in the post development landscape by increasing treatment of pollutants and sediments, and minimizing the need for some landscaping chemicals. To be successful, the soil condition must be able to soak water into the ground for a reasonable number of years. This on-site BMP shall be maintained per Appendix A of the City of Renton’s Surface Water Design Manual. MAINTENANCE RESTRICTIONS The size, placement, and composition of these devices as depicted by the site plan and design details must be maintained and may not be changed without written approval from the City of Renton or through a future development permit from the City of Renton. INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES To be successful, the soil must be able to soak water into the ground for a reasonable number of years. • Return leaf fall and shredded woody materials from the landscape to the site when possible in order to replenish soil nutrients and structure. • On turf areas, “grasscycle” (mulch-mow or leave the clippings) to build turf health. • Maintain 2 to 3 inches of mulch over bare areas in landscape beds. • Re-seed bare turf areas until the vegetation fully covers the ground surface. • Avoid using pesticides (bug and weed killers) which damage the soil. • Where fertilization is needed (mainly turf and annual flower beds), a moderate fertilization program should be used which relies on compost, natural fertilizers, or slow-release synthetic balanced fertilizers. RECORDING REQUIREMENT These on-site BMP maintenance and operation instructions must be recorded as an attachment to the required declaration of covenant and grant of easement per Requirement 3 of Section C.1.3.4 of the City of Renton Surface Water Design Manual. The intent of these instructions is to explain to future property owners, the purpose of the BMP and how it must be maintained and operated. These instructions are intended to be a minimum; the City of Renton may require additional instructions based on site-specific conditions. See the City of Renton’s Surface Water Design Manual website for additional information and updates. Page 6 of ___ LOT 27, BLOCK 20, HILLMANS LAKE WASHINGTON GARDEN OF EDEN ADDITION TO SEATTLE NO.1, ACCORDING TO THE PLAT THEREOF RECORDED IN VOLUME 11 OF PLATS, PAGE 63, IN KING COUNTY, WASHINGTON. TOGETHER WITH THAT PORTION OF VACATED ALLEY ADJACENT, WHICH ATTACHED BY OPERATION OF LAW. EXHIBIT C - LEGAL DESCRIPTION 10 of 10 TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 42 of 46 APPENDIX D – OPERATIONS AND MAINTENANCE MANUAL MAINTENANCE INSTRUCTIONS FOR FULL INFILTRATION Your property contains an on-site BMP (best management practice) called “full infiltration,” which was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious surfaces on your property. Full infiltration is a method of soaking runoff from impervious area (such as paved areas and roofs) into the ground. If properly installed and maintained per Appendix A of the City of Renton’s Surface Water Design Manual, full infiltration can manage runoff so that a majority of precipitation events are absorbed. Infiltration devices, such as gravel filled trenches, drywells, and ground surface depressions, facilitate this process by putting runoff in direct contact with the soil and holding the runoff long enough to soak most of it into the ground. To be successful, the soil condition around the infiltration device must be reliably able to soak water into the ground for a reasonable number of years. Infiltration Devices The infiltration devices used on your property include the following as indicated on the site plan (CHECK THE BOX(ES) THAT APPLY): gravel filled trenches, drywells, ground surface depressions. MAINTENANCE RESTRICTIONS The size, placement, and composition of these devices as depicted by the site plan and design details must be maintained and may not be changed without written approval from the City of Renton or through a future development permit from the City of Renton. INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES • Infiltration devices must be inspected annually and after major storm events to identify and repair any physical defects. • Maintenance and operation of the system should focus on ensuring the system’s viability by preventing sediment-laden flows from entering the device. Excessive sedimentation will result in a plugged or non-functioning facility. • If the infiltration device has a catch basin, sediment accumulation must be removed on a yearly basis or more frequently if necessary. • Prolonged ponding around or atop a device may indicate a plugged facility. If the device becomes plugged, it must be replaced. • Keeping the areas that drain to infiltration devices well swept and clean will enhance the longevity of these devices. • For roofs, frequent cleaning of gutters will reduce sediment loads to these devices. X RECORDING REQUIREMENT These full infiltration on-site BMP maintenance and operation instructions must be recorded as an attachment to the required declaration of covenant and grant of easement per Requirement 3 of Section C.1.3.4 of the City of Renton Surface Water Design Manual. The intent of these instructions is to explain to future property owners, the purpose of the BMP and how it must be maintained and operated. These instructions are intended to be a minimum; the City of Renton may require additional instructions based on site-specific conditions. See the City of Renton’s Surface Water Design Manual website for additional information and updates. TYPICAL FULL INFILTRATION APPLICATIONS 6" 24" 12" 24" WASHED ROCK 1 12"- 34" LEVEL INFILTRATION TRENCH SECTION ANTS PLAN VIEWNTS SECTION VIEW NTS VARIES A A 6" 6" 4" RIGID OR 6"FLEXIBLEPERFORATEDPIPE CB SUMP w/SOLID LID ROOF DRAIN 4" RIGID OR 6" FLEXIBLEPERFORATED PIPE OVERFLOW SPLASH BLOCK ROOF DRAIN CB SUMP w/SOLID LID 12" FINE MESHSCREEN SETBACKFROMBUILDING5' MIN. 1' MIN.1' MIN. FILTER FABRIC COMPACTED BACKFILL 4" RIGID OR 6" FLEXIBLE PERFORATED PIPE 112" - 34" WASHED ROCK MIN. 1' ABOVE SEASONALHIGH GROUNDWATERTABLE, SEE SECTION C.2.2.2 TRENCH SETBACK FROMBUILDING AS REQUIRED,15' MIN. DRIVEWAY X-SECTION NTS 2' MIN. FILTER STRIPSEE SECTIONS6.3.4 & 6.3.5 18" MIN. 6" MIN. 3/4" TO 1-1/2"WASHED DRAINROCK GRASS OVERFLOW NOTE:SEE C.2.2.3 FOR TRENCH LENGTHS,TRENCH SPACING ANDSITE LIMITATIONS MIN. 1' ABOVESEASONAL HIGHGROUNDWATERTABLE, SEESECTION C.2.2.2 X-SECTION NTS GRASS 2' MIN. 18" MIN. 6" MIN. 3/4" TO 1-1/2"WASHED DRAINROCK OVERFLOW 15' MIN. ASREQUIRED,SEE C.2.2.3 FROM ROOF NS T T S MIN. 1' ABOVESEASONAL HIGHGROUNDWATERTABLE, SEESECTION C.2.2.2 HOUSE FLOW 48 INCH DIAMETERHOLE FILLED WITH 1 12" - 3" WASHEDDRAIN ROCK SECTIONNTS MARK CENTER OF HOLEWITH 1" CAPPED PVCOR OTHER MEANSFLUSH WITH SURFACE ROOF DOWNSPOUT OVERFLOW SPLASH BLOCK TOPSOIL FINE MESH SCREEN MIN. 4" DIA.PVC PIPE SIDES OF HOLELINED WITHFILTER FABRIC CATCH BASIN(YARD DRAIN) 15' MIN. AS REQUIRED, SEE SECTION C.2.2.3 VARIES 1' MIN. MIN. 1' ABOVE SEASONALHIGH GROUNDWATER TABLE,SEE SECTION C.2.2.2 5' MIN. SETBACKFROM BUILDING FLOW PLAN VIEWNTS HOUSE ROOFDOWNSPOUT ROOFDOWNSPOUT CATCH BASIN(YARD DRAIN) 48 INCH DIAMETERHOLE FILLED WITH1 12" - 3" WASHEDDRAIN ROCK TIR FOR 1218 N 35TH ST STRAGHT ARROW HOMES SFRS (21027) THIRD DAY DESIGN Page 46 of 46 APPENDIX E – WWHM REPORT WWHM2012 PROJECT REPORT 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 2 General Model Information Project Name:21027 Renton N 35th-R1 Site Name:Straight Arrow Renton N 35th Site Address:1218 N 35th St City:Renton Report Date:12/10/2021 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2019/09/13 Version:4.2.17 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year Low Flow Threshold for POC2:50 Percent of the 2 Year High Flow Threshold for POC2:50 Year Low Flow Threshold for POC3:50 Percent of the 2 Year High Flow Threshold for POC3:50 Year 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 3 Landuse Basin Data Predeveloped Land Use East Lot Pre-Dev Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Flat 0.06942 Pervious Total 0.06942 Impervious Land Use acre Impervious Total 0 Basin Total 0.06942 Element Flows To: Surface Interflow Groundwater 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 4 West Lot Pre-Dev Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Flat 0.06944 Pervious Total 0.06944 Impervious Land Use acre Impervious Total 0 Basin Total 0.06944 Element Flows To: Surface Interflow Groundwater 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 5 Existing Conditions Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 0.18424 Pervious Total 0.18424 Impervious Land Use acre ROOF TOPS FLAT 0.05466 DRIVEWAYS FLAT 0.02307 SIDEWALKS FLAT 0.02491 Impervious Total 0.10264 Basin Total 0.28688 Element Flows To: Surface Interflow Groundwater 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 6 Mitigated Land Use East Lot Bypass:No GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROOF TOPS FLAT 0.05732 DRIVEWAYS FLAT 0.00996 SIDEWALKS FLAT 0.00159 Impervious Total 0.06887 Basin Total 0.06887 Element Flows To: Surface Interflow Groundwater East Lot Gravel TrenchEast Lot Gravel Trench 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 7 East Lot Bypass Bypass:Yes GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre SIDEWALKS FLAT 0.00055 Impervious Total 0.00055 Basin Total 0.00055 Element Flows To: Surface Interflow Groundwater 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 8 West Lot Bypass:No GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROOF TOPS FLAT 0.05732 DRIVEWAYS FLAT 0.00996 SIDEWALKS FLAT 0.00161 Impervious Total 0.06889 Basin Total 0.06889 Element Flows To: Surface Interflow Groundwater West Lot Gravel TrenchWest Lot Gravel Trench 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 9 West Lot Bypass Bypass:Yes GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre SIDEWALKS FLAT 0.00055 Impervious Total 0.00055 Basin Total 0.00055 Element Flows To: Surface Interflow Groundwater 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 10 Developed Condition Bypass:No GroundWater:No Pervious Land Use acre C, Pasture, Flat 0.11532 Pervious Total 0.11532 Impervious Land Use acre ROOF TOPS FLAT 0.11465 DRIVEWAYS FLAT 0.04298 SIDEWALKS FLAT 0.01394 Impervious Total 0.17157 Basin Total 0.28689 Element Flows To: Surface Interflow Groundwater 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 11 Routing Elements Predeveloped Routing 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 12 Mitigated Routing East Lot Gravel Trench Bottom Length:23.00 ft. Bottom Width:10.00 ft. Trench bottom slope 1:0 To 1 Trench Left side slope 0:0 To 1 Trench right side slope 2:0 To 1 Material thickness of first layer:4 Pour Space of material for first layer:0.35 Material thickness of second layer:0 Pour Space of material for second layer:0 Material thickness of third layer:0 Pour Space of material for third layer:0 Infiltration On Infiltration rate:0.3 Infiltration safety factor:0.375 Total Volume Infiltrated (ac-ft.):9.167 Total Volume Through Riser (ac-ft.):1.657 Total Volume Through Facility (ac-ft.):10.824 Percent Infiltrated:84.69 Total Precip Applied to Facility:0 Total Evap From Facility:0 Discharge Structure Riser Height:3.8 ft. Riser Diameter:10 in. Element Flows To: Outlet 1 Outlet 2 Gravel Trench Bed Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.005 0.000 0.000 0.000 0.0444 0.005 0.000 0.000 0.000 0.0889 0.005 0.000 0.000 0.000 0.1333 0.005 0.000 0.000 0.000 0.1778 0.005 0.000 0.000 0.000 0.2222 0.005 0.000 0.000 0.000 0.2667 0.005 0.000 0.000 0.000 0.3111 0.005 0.000 0.000 0.000 0.3556 0.005 0.000 0.000 0.000 0.4000 0.005 0.000 0.000 0.000 0.4444 0.005 0.000 0.000 0.000 0.4889 0.005 0.000 0.000 0.000 0.5333 0.005 0.001 0.000 0.000 0.5778 0.005 0.001 0.000 0.000 0.6222 0.005 0.001 0.000 0.000 0.6667 0.005 0.001 0.000 0.000 0.7111 0.005 0.001 0.000 0.000 0.7556 0.005 0.001 0.000 0.000 0.8000 0.005 0.001 0.000 0.000 0.8444 0.005 0.001 0.000 0.000 0.8889 0.005 0.001 0.000 0.000 0.9333 0.005 0.001 0.000 0.000 0.9778 0.005 0.001 0.000 0.000 1.0222 0.005 0.001 0.000 0.000 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 13 1.0667 0.005 0.002 0.000 0.000 1.1111 0.005 0.002 0.000 0.000 1.1556 0.005 0.002 0.000 0.000 1.2000 0.005 0.002 0.000 0.000 1.2444 0.005 0.002 0.000 0.000 1.2889 0.005 0.002 0.000 0.000 1.3333 0.005 0.002 0.000 0.000 1.3778 0.005 0.002 0.000 0.000 1.4222 0.005 0.002 0.000 0.000 1.4667 0.005 0.002 0.000 0.000 1.5111 0.005 0.002 0.000 0.000 1.5556 0.005 0.002 0.000 0.000 1.6000 0.005 0.003 0.000 0.000 1.6444 0.005 0.003 0.000 0.000 1.6889 0.005 0.003 0.000 0.000 1.7333 0.005 0.003 0.000 0.000 1.7778 0.005 0.003 0.000 0.000 1.8222 0.005 0.003 0.000 0.000 1.8667 0.005 0.003 0.000 0.000 1.9111 0.005 0.003 0.000 0.000 1.9556 0.005 0.003 0.000 0.000 2.0000 0.005 0.003 0.000 0.000 2.0444 0.005 0.003 0.000 0.000 2.0889 0.005 0.003 0.000 0.000 2.1333 0.005 0.003 0.000 0.000 2.1778 0.005 0.004 0.000 0.000 2.2222 0.005 0.004 0.000 0.000 2.2667 0.005 0.004 0.000 0.000 2.3111 0.005 0.004 0.000 0.000 2.3556 0.005 0.004 0.000 0.000 2.4000 0.005 0.004 0.000 0.000 2.4444 0.005 0.004 0.000 0.000 2.4889 0.005 0.004 0.000 0.000 2.5333 0.005 0.004 0.000 0.000 2.5778 0.005 0.004 0.000 0.000 2.6222 0.005 0.004 0.000 0.000 2.6667 0.005 0.004 0.000 0.000 2.7111 0.005 0.005 0.000 0.000 2.7556 0.005 0.005 0.000 0.000 2.8000 0.005 0.005 0.000 0.000 2.8444 0.005 0.005 0.000 0.000 2.8889 0.005 0.005 0.000 0.000 2.9333 0.005 0.005 0.000 0.000 2.9778 0.005 0.005 0.000 0.000 3.0222 0.005 0.005 0.000 0.000 3.0667 0.005 0.005 0.000 0.000 3.1111 0.005 0.005 0.000 0.000 3.1556 0.005 0.005 0.000 0.000 3.2000 0.005 0.005 0.000 0.000 3.2444 0.005 0.006 0.000 0.000 3.2889 0.005 0.006 0.000 0.000 3.3333 0.005 0.006 0.000 0.000 3.3778 0.005 0.006 0.000 0.000 3.4222 0.005 0.006 0.000 0.000 3.4667 0.005 0.006 0.000 0.000 3.5111 0.005 0.006 0.000 0.000 3.5556 0.005 0.006 0.000 0.000 3.6000 0.005 0.006 0.000 0.000 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 14 3.6444 0.005 0.006 0.000 0.000 3.6889 0.005 0.006 0.000 0.000 3.7333 0.005 0.006 0.000 0.000 3.7778 0.005 0.007 0.000 0.000 3.8222 0.005 0.007 0.029 0.000 3.8667 0.005 0.007 0.151 0.000 3.9111 0.005 0.007 0.323 0.000 3.9556 0.005 0.007 0.523 0.000 4.0000 0.005 0.007 0.733 0.000 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 15 West Lot Gravel Trench Bottom Length:23.00 ft. Bottom Width:10.00 ft. Trench bottom slope 1:0 To 1 Trench Left side slope 0:0 To 1 Trench right side slope 2:0 To 1 Material thickness of first layer:4 Pour Space of material for first layer:0.35 Material thickness of second layer:0 Pour Space of material for second layer:0 Material thickness of third layer:0 Pour Space of material for third layer:0 Infiltration On Infiltration rate:0.3 Infiltration safety factor:0.375 Total Volume Infiltrated (ac-ft.):9.167 Total Volume Through Riser (ac-ft.):1.657 Total Volume Through Facility (ac-ft.):10.824 Percent Infiltrated:84.69 Total Precip Applied to Facility:0 Total Evap From Facility:0 Discharge Structure Riser Height:3.8 ft. Riser Diameter:10 in. Element Flows To: Outlet 1 Outlet 2 Gravel Trench Bed Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.005 0.000 0.000 0.000 0.0444 0.005 0.000 0.000 0.000 0.0889 0.005 0.000 0.000 0.000 0.1333 0.005 0.000 0.000 0.000 0.1778 0.005 0.000 0.000 0.000 0.2222 0.005 0.000 0.000 0.000 0.2667 0.005 0.000 0.000 0.000 0.3111 0.005 0.000 0.000 0.000 0.3556 0.005 0.000 0.000 0.000 0.4000 0.005 0.000 0.000 0.000 0.4444 0.005 0.000 0.000 0.000 0.4889 0.005 0.000 0.000 0.000 0.5333 0.005 0.001 0.000 0.000 0.5778 0.005 0.001 0.000 0.000 0.6222 0.005 0.001 0.000 0.000 0.6667 0.005 0.001 0.000 0.000 0.7111 0.005 0.001 0.000 0.000 0.7556 0.005 0.001 0.000 0.000 0.8000 0.005 0.001 0.000 0.000 0.8444 0.005 0.001 0.000 0.000 0.8889 0.005 0.001 0.000 0.000 0.9333 0.005 0.001 0.000 0.000 0.9778 0.005 0.001 0.000 0.000 1.0222 0.005 0.001 0.000 0.000 1.0667 0.005 0.002 0.000 0.000 1.1111 0.005 0.002 0.000 0.000 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 16 1.1556 0.005 0.002 0.000 0.000 1.2000 0.005 0.002 0.000 0.000 1.2444 0.005 0.002 0.000 0.000 1.2889 0.005 0.002 0.000 0.000 1.3333 0.005 0.002 0.000 0.000 1.3778 0.005 0.002 0.000 0.000 1.4222 0.005 0.002 0.000 0.000 1.4667 0.005 0.002 0.000 0.000 1.5111 0.005 0.002 0.000 0.000 1.5556 0.005 0.002 0.000 0.000 1.6000 0.005 0.003 0.000 0.000 1.6444 0.005 0.003 0.000 0.000 1.6889 0.005 0.003 0.000 0.000 1.7333 0.005 0.003 0.000 0.000 1.7778 0.005 0.003 0.000 0.000 1.8222 0.005 0.003 0.000 0.000 1.8667 0.005 0.003 0.000 0.000 1.9111 0.005 0.003 0.000 0.000 1.9556 0.005 0.003 0.000 0.000 2.0000 0.005 0.003 0.000 0.000 2.0444 0.005 0.003 0.000 0.000 2.0889 0.005 0.003 0.000 0.000 2.1333 0.005 0.003 0.000 0.000 2.1778 0.005 0.004 0.000 0.000 2.2222 0.005 0.004 0.000 0.000 2.2667 0.005 0.004 0.000 0.000 2.3111 0.005 0.004 0.000 0.000 2.3556 0.005 0.004 0.000 0.000 2.4000 0.005 0.004 0.000 0.000 2.4444 0.005 0.004 0.000 0.000 2.4889 0.005 0.004 0.000 0.000 2.5333 0.005 0.004 0.000 0.000 2.5778 0.005 0.004 0.000 0.000 2.6222 0.005 0.004 0.000 0.000 2.6667 0.005 0.004 0.000 0.000 2.7111 0.005 0.005 0.000 0.000 2.7556 0.005 0.005 0.000 0.000 2.8000 0.005 0.005 0.000 0.000 2.8444 0.005 0.005 0.000 0.000 2.8889 0.005 0.005 0.000 0.000 2.9333 0.005 0.005 0.000 0.000 2.9778 0.005 0.005 0.000 0.000 3.0222 0.005 0.005 0.000 0.000 3.0667 0.005 0.005 0.000 0.000 3.1111 0.005 0.005 0.000 0.000 3.1556 0.005 0.005 0.000 0.000 3.2000 0.005 0.005 0.000 0.000 3.2444 0.005 0.006 0.000 0.000 3.2889 0.005 0.006 0.000 0.000 3.3333 0.005 0.006 0.000 0.000 3.3778 0.005 0.006 0.000 0.000 3.4222 0.005 0.006 0.000 0.000 3.4667 0.005 0.006 0.000 0.000 3.5111 0.005 0.006 0.000 0.000 3.5556 0.005 0.006 0.000 0.000 3.6000 0.005 0.006 0.000 0.000 3.6444 0.005 0.006 0.000 0.000 3.6889 0.005 0.006 0.000 0.000 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 17 3.7333 0.005 0.006 0.000 0.000 3.7778 0.005 0.007 0.000 0.000 3.8222 0.005 0.007 0.029 0.000 3.8667 0.005 0.007 0.151 0.000 3.9111 0.005 0.007 0.323 0.000 3.9556 0.005 0.007 0.523 0.000 4.0000 0.005 0.007 0.733 0.000 21027 Renton N 35th-R1 12/10/2021 7:35:10 AM Page 18 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.06942 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:0.06942 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.002041 5 year 0.003205 10 year 0.003865 25 year 0.004565 50 year 0.004997 100 year 0.005365 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.019678 5 year 0.027691 10 year 0.032721 25 year 0.038761 50 year 0.043043 100 year 0.047153 Annual Peaks 21027 Renton N 35th-R1 12/10/2021 7:36:47 AM Page 19 Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.002 0.017 1950 0.002 0.026 1951 0.004 0.020 1952 0.001 0.010 1953 0.001 0.016 1954 0.002 0.012 1955 0.003 0.017 1956 0.002 0.017 1957 0.002 0.026 1958 0.002 0.017 1959 0.002 0.015 1960 0.003 0.021 1961 0.002 0.023 1962 0.001 0.010 1963 0.001 0.015 1964 0.002 0.016 1965 0.001 0.014 1966 0.001 0.018 1967 0.003 0.029 1968 0.002 0.016 1969 0.002 0.020 1970 0.001 0.014 1971 0.001 0.023 1972 0.003 0.022 1973 0.002 0.014 1974 0.002 0.023 1975 0.002 0.026 1976 0.002 0.020 1977 0.000 0.018 1978 0.001 0.017 1979 0.001 0.004 1980 0.003 0.035 1981 0.001 0.021 1982 0.002 0.038 1983 0.002 0.012 1984 0.001 0.015 1985 0.001 0.016 1986 0.004 0.023 1987 0.003 0.024 1988 0.001 0.014 1989 0.001 0.014 1990 0.007 0.047 1991 0.004 0.036 1992 0.002 0.017 1993 0.002 0.011 1994 0.001 0.010 1995 0.002 0.017 1996 0.005 0.021 1997 0.004 0.024 1998 0.001 0.019 1999 0.004 0.031 2000 0.002 0.022 2001 0.000 0.011 2002 0.002 0.033 2003 0.002 0.021 2004 0.003 0.048 21027 Renton N 35th-R1 12/10/2021 7:36:47 AM Page 20 2005 0.002 0.022 2006 0.002 0.019 2007 0.005 0.044 2008 0.006 0.035 2009 0.003 0.024 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0065 0.0477 2 0.0063 0.0471 3 0.0049 0.0438 4 0.0048 0.0385 5 0.0045 0.0363 6 0.0040 0.0351 7 0.0039 0.0351 8 0.0037 0.0331 9 0.0035 0.0307 10 0.0033 0.0288 11 0.0032 0.0265 12 0.0031 0.0260 13 0.0031 0.0259 14 0.0030 0.0244 15 0.0029 0.0241 16 0.0028 0.0237 17 0.0028 0.0230 18 0.0025 0.0229 19 0.0024 0.0228 20 0.0024 0.0228 21 0.0023 0.0222 22 0.0022 0.0222 23 0.0022 0.0220 24 0.0022 0.0211 25 0.0022 0.0211 26 0.0020 0.0208 27 0.0020 0.0207 28 0.0020 0.0202 29 0.0019 0.0202 30 0.0018 0.0199 31 0.0018 0.0188 32 0.0017 0.0188 33 0.0017 0.0185 34 0.0017 0.0182 35 0.0017 0.0174 36 0.0017 0.0173 37 0.0017 0.0173 38 0.0016 0.0171 39 0.0016 0.0167 40 0.0016 0.0167 41 0.0015 0.0165 42 0.0015 0.0162 43 0.0015 0.0161 44 0.0015 0.0159 45 0.0014 0.0157 46 0.0014 0.0150 47 0.0014 0.0148 48 0.0014 0.0147 49 0.0013 0.0142 21027 Renton N 35th-R1 12/10/2021 7:36:47 AM Page 21 50 0.0013 0.0139 51 0.0013 0.0139 52 0.0012 0.0137 53 0.0011 0.0136 54 0.0011 0.0122 55 0.0009 0.0121 56 0.0009 0.0111 57 0.0008 0.0110 58 0.0008 0.0104 59 0.0005 0.0102 60 0.0003 0.0101 61 0.0002 0.0041 21027 Renton N 35th-R1 12/10/2021 7:36:47 AM Page 22 LID Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.0002 229716 22822 9 Pass 0.0002 221802 22758 10 Pass 0.0002 213482 22651 10 Pass 0.0002 205482 22565 10 Pass 0.0002 198745 22480 11 Pass 0.0002 191430 22394 11 Pass 0.0002 184628 22309 12 Pass 0.0002 178917 22244 12 Pass 0.0002 172736 22159 12 Pass 0.0002 166961 22052 13 Pass 0.0002 162063 21988 13 Pass 0.0003 156801 21902 13 Pass 0.0003 151775 21838 14 Pass 0.0003 147561 21752 14 Pass 0.0003 142941 21688 15 Pass 0.0003 138492 21603 15 Pass 0.0003 134642 21560 16 Pass 0.0003 130493 21474 16 Pass 0.0003 126408 21389 16 Pass 0.0003 122943 21331 17 Pass 0.0003 119178 21265 17 Pass 0.0003 115478 21194 18 Pass 0.0004 112313 21130 18 Pass 0.0004 108869 21040 19 Pass 0.0004 105490 20974 19 Pass 0.0004 102581 20903 20 Pass 0.0004 99479 20831 20 Pass 0.0004 96485 20747 21 Pass 0.0004 93875 20677 22 Pass 0.0004 91095 20606 22 Pass 0.0004 88421 20542 23 Pass 0.0004 86175 20467 23 Pass 0.0004 83694 20403 24 Pass 0.0004 81256 20326 25 Pass 0.0005 79160 20277 25 Pass 0.0005 76914 20212 26 Pass 0.0005 74968 20159 26 Pass 0.0005 72829 20099 27 Pass 0.0005 70861 20031 28 Pass 0.0005 69171 19971 28 Pass 0.0005 67204 19900 29 Pass 0.0005 65386 19840 30 Pass 0.0005 63803 19789 31 Pass 0.0005 62113 19725 31 Pass 0.0005 60509 19661 32 Pass 0.0006 59161 19596 33 Pass 0.0006 57664 19541 33 Pass 0.0006 56146 19464 34 Pass 0.0006 54841 19400 35 Pass 0.0006 53451 19338 36 Pass 0.0006 52103 19278 36 Pass 0.0006 50927 19229 37 Pass 0.0006 49643 19164 38 Pass 21027 Renton N 35th-R1 12/10/2021 7:36:47 AM Page 23 0.0006 48381 19081 39 Pass 0.0006 47333 19030 40 Pass 0.0006 46136 18972 41 Pass 0.0006 44959 18921 42 Pass 0.0007 43997 18859 42 Pass 0.0007 42970 18792 43 Pass 0.0007 41922 18745 44 Pass 0.0007 41045 18700 45 Pass 0.0007 40061 18642 46 Pass 0.0007 39035 18589 47 Pass 0.0007 38243 18540 48 Pass 0.0007 37302 18467 49 Pass 0.0007 36404 18416 50 Pass 0.0007 35612 18373 51 Pass 0.0007 34778 18317 52 Pass 0.0008 33944 18264 53 Pass 0.0008 33217 18219 54 Pass 0.0008 32425 18168 56 Pass 0.0008 31677 18116 57 Pass 0.0008 31014 18074 58 Pass 0.0008 30265 17999 59 Pass 0.0008 29517 17943 60 Pass 0.0008 28918 17894 61 Pass 0.0008 28255 17830 63 Pass 0.0008 27570 17763 64 Pass 0.0008 27014 17721 65 Pass 0.0008 26415 17665 66 Pass 0.0009 25880 17614 68 Pass 0.0009 25303 17562 69 Pass 0.0009 24725 17520 70 Pass 0.0009 24255 17477 72 Pass 0.0009 23742 17428 73 Pass 0.0009 23228 17378 74 Pass 0.0009 22822 17319 75 Pass 0.0009 22330 17265 77 Pass 0.0009 21902 17220 78 Pass 0.0009 21496 17169 79 Pass 0.0009 21044 17132 81 Pass 0.0010 20627 17088 82 Pass 0.0010 20262 17034 84 Pass 0.0010 19817 16981 85 Pass 0.0010 19383 16938 87 Pass 0.0010 19025 16901 88 Pass 0.0010 18625 16848 90 Pass 0.0010 18245 16790 92 Pass 0.0010 17909 16741 93 Pass 0.0010 17573 16705 95 Pass 21027 Renton N 35th-R1 12/10/2021 7:37:15 AM Page 24 Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.0010 17573 16705 95 Pass 0.0011 16185 16482 101 Fail 0.0011 14985 16277 108 Fail 0.0011 13849 16072 116 Fail 0.0012 12814 15883 123 Fail 0.0012 11813 15699 132 Fail 0.0013 10904 15492 142 Fail 0.0013 10125 15282 150 Fail 0.0013 9396 15090 160 Fail 0.0014 8729 14906 170 Fail 0.0014 8147 14728 180 Fail 0.0015 7597 14568 191 Fail 0.0015 7067 14393 203 Fail 0.0015 6594 14232 215 Fail 0.0016 6154 14031 227 Fail 0.0016 5775 13864 240 Fail 0.0017 5431 13689 252 Fail 0.0017 5101 13533 265 Fail 0.0017 4808 13368 278 Fail 0.0018 4528 13205 291 Fail 0.0018 4256 13041 306 Fail 0.0019 4017 12874 320 Fail 0.0019 3784 12707 335 Fail 0.0019 3548 12583 354 Fail 0.0020 3339 12416 371 Fail 0.0020 3138 12286 391 Fail 0.0021 2954 12121 410 Fail 0.0021 2785 11961 429 Fail 0.0021 2599 11807 454 Fail 0.0022 2449 11676 476 Fail 0.0022 2308 11524 499 Fail 0.0023 2162 11383 526 Fail 0.0023 2028 11242 554 Fail 0.0023 1898 11105 585 Fail 0.0024 1790 10977 613 Fail 0.0024 1688 10844 642 Fail 0.0025 1588 10733 675 Fail 0.0025 1483 10615 715 Fail 0.0025 1382 10483 758 Fail 0.0026 1292 10361 801 Fail 0.0026 1219 10230 839 Fail 0.0027 1155 10102 874 Fail 0.0027 1098 9997 910 Fail 0.0027 1048 9871 941 Fail 0.0028 997 9758 978 Fail 0.0028 930 9638 1036 Fail 0.0029 883 9516 1077 Fail 0.0029 837 9394 1122 Fail 0.0029 789 9285 1176 Fail 0.0030 743 9172 1234 Fail 0.0030 713 9071 1272 Fail 0.0031 668 8964 1341 Fail 0.0031 630 8857 1405 Fail 0.0031 596 8774 1472 Fail 21027 Renton N 35th-R1 12/10/2021 7:37:15 AM Page 25 0.0032 566 8675 1532 Fail 0.0032 539 8588 1593 Fail 0.0033 497 8491 1708 Fail 0.0033 473 8380 1771 Fail 0.0034 434 8292 1910 Fail 0.0034 399 8192 2053 Fail 0.0034 366 8098 2212 Fail 0.0035 348 8002 2299 Fail 0.0035 323 7903 2446 Fail 0.0036 296 7815 2640 Fail 0.0036 272 7726 2840 Fail 0.0036 256 7638 2983 Fail 0.0037 235 7561 3217 Fail 0.0037 217 7484 3448 Fail 0.0038 197 7403 3757 Fail 0.0038 180 7309 4060 Fail 0.0038 158 7221 4570 Fail 0.0039 145 7133 4919 Fail 0.0039 129 7054 5468 Fail 0.0040 119 6979 5864 Fail 0.0040 109 6913 6342 Fail 0.0040 97 6838 7049 Fail 0.0041 91 6776 7446 Fail 0.0041 82 6701 8171 Fail 0.0042 76 6620 8710 Fail 0.0042 69 6543 9482 Fail 0.0042 61 6462 10593 Fail 0.0043 54 6389 11831 Fail 0.0043 48 6325 13177 Fail 0.0044 41 6269 15290 Fail 0.0044 38 6196 16305 Fail 0.0044 33 6113 18524 Fail 0.0045 27 6034 22348 Fail 0.0045 22 5967 27122 Fail 0.0046 21 5901 28100 Fail 0.0046 20 5852 29260 Fail 0.0046 19 5784 30442 Fail 0.0047 17 5713 33605 Fail 0.0047 14 5651 40364 Fail 0.0048 12 5591 46591 Fail 0.0048 8 5529 69112 Fail 0.0048 4 5476 136900 Fail 0.0049 3 5422 180733 Fail 0.0049 3 5371 179033 Fail 0.0050 3 5315 177166 Fail 0.0050 3 5260 175333 Fail The development has an increase in flow durations from 1/2 Predeveloped 2 year flow to the 2 year flow or more than a 10% increase from the 2 year to the 50 year flow. The development has an increase in flow durations for more than 50% of the flows for the range of the duration analysis. 21027 Renton N 35th-R1 12/10/2021 7:37:15 AM Page 26 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. 21027 Renton N 35th-R1 12/10/2021 7:37:15 AM Page 27 LID Report 21027 Renton N 35th-R1 12/10/2021 7:38:43 AM Page 28 POC 2 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #2 Total Pervious Area:0.06944 Total Impervious Area:0 Mitigated Landuse Totals for POC #2 Total Pervious Area:0 Total Impervious Area:0.06944 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #2 Return Period Flow(cfs) 2 year 0.002042 5 year 0.003206 10 year 0.003867 25 year 0.004566 50 year 0.004999 100 year 0.005367 Flow Frequency Return Periods for Mitigated. POC #2 Return Period Flow(cfs) 2 year 0.019678 5 year 0.027691 10 year 0.032721 25 year 0.038761 50 year 0.043043 100 year 0.047153 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #2 Year Predeveloped Mitigated 21027 Renton N 35th-R1 12/10/2021 7:40:19 AM Page 29 1949 0.002 0.017 1950 0.003 0.026 1951 0.004 0.020 1952 0.001 0.010 1953 0.001 0.016 1954 0.002 0.012 1955 0.003 0.017 1956 0.002 0.017 1957 0.002 0.026 1958 0.002 0.017 1959 0.002 0.015 1960 0.003 0.021 1961 0.002 0.023 1962 0.001 0.010 1963 0.001 0.015 1964 0.002 0.016 1965 0.001 0.014 1966 0.001 0.018 1967 0.003 0.029 1968 0.002 0.016 1969 0.002 0.020 1970 0.001 0.014 1971 0.001 0.023 1972 0.003 0.022 1973 0.002 0.014 1974 0.002 0.023 1975 0.002 0.026 1976 0.002 0.020 1977 0.000 0.018 1978 0.001 0.017 1979 0.001 0.004 1980 0.003 0.035 1981 0.001 0.021 1982 0.002 0.038 1983 0.002 0.012 1984 0.001 0.015 1985 0.001 0.016 1986 0.004 0.023 1987 0.003 0.024 1988 0.001 0.014 1989 0.001 0.014 1990 0.007 0.047 1991 0.004 0.036 1992 0.002 0.017 1993 0.002 0.011 1994 0.001 0.010 1995 0.002 0.017 1996 0.005 0.021 1997 0.004 0.024 1998 0.001 0.019 1999 0.004 0.031 2000 0.002 0.022 2001 0.000 0.011 2002 0.002 0.033 2003 0.002 0.021 2004 0.003 0.048 2005 0.002 0.022 2006 0.002 0.019 21027 Renton N 35th-R1 12/10/2021 7:40:19 AM Page 30 2007 0.005 0.044 2008 0.006 0.035 2009 0.003 0.024 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #2 Rank Predeveloped Mitigated 1 0.0065 0.0477 2 0.0063 0.0471 3 0.0049 0.0438 4 0.0048 0.0385 5 0.0045 0.0363 6 0.0040 0.0351 7 0.0039 0.0351 8 0.0038 0.0331 9 0.0035 0.0307 10 0.0033 0.0288 11 0.0032 0.0265 12 0.0031 0.0260 13 0.0031 0.0259 14 0.0030 0.0244 15 0.0029 0.0241 16 0.0028 0.0237 17 0.0028 0.0230 18 0.0025 0.0229 19 0.0024 0.0228 20 0.0024 0.0228 21 0.0023 0.0222 22 0.0022 0.0222 23 0.0022 0.0220 24 0.0022 0.0211 25 0.0022 0.0211 26 0.0020 0.0208 27 0.0020 0.0207 28 0.0020 0.0202 29 0.0019 0.0202 30 0.0018 0.0199 31 0.0018 0.0188 32 0.0017 0.0188 33 0.0017 0.0185 34 0.0017 0.0182 35 0.0017 0.0174 36 0.0017 0.0173 37 0.0017 0.0173 38 0.0016 0.0171 39 0.0016 0.0167 40 0.0016 0.0167 41 0.0015 0.0165 42 0.0015 0.0162 43 0.0015 0.0161 44 0.0015 0.0159 45 0.0014 0.0157 46 0.0014 0.0150 47 0.0014 0.0148 48 0.0014 0.0147 49 0.0013 0.0142 50 0.0013 0.0139 51 0.0013 0.0139 21027 Renton N 35th-R1 12/10/2021 7:40:19 AM Page 31 52 0.0012 0.0137 53 0.0011 0.0136 54 0.0011 0.0122 55 0.0009 0.0121 56 0.0009 0.0111 57 0.0008 0.0110 58 0.0008 0.0104 59 0.0005 0.0102 60 0.0003 0.0101 61 0.0002 0.0041 21027 Renton N 35th-R1 12/10/2021 7:40:19 AM Page 32 LID Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.0002 229930 22822 9 Pass 0.0002 220946 22736 10 Pass 0.0002 213524 22651 10 Pass 0.0002 205525 22565 10 Pass 0.0002 197975 22458 11 Pass 0.0002 191473 22394 11 Pass 0.0002 184671 22309 12 Pass 0.0002 178254 22223 12 Pass 0.0002 172779 22159 12 Pass 0.0002 166982 22052 13 Pass 0.0002 162127 21988 13 Pass 0.0003 156823 21902 13 Pass 0.0003 151818 21838 14 Pass 0.0003 147583 21752 14 Pass 0.0003 142984 21688 15 Pass 0.0003 138535 21603 15 Pass 0.0003 134664 21560 16 Pass 0.0003 130514 21474 16 Pass 0.0003 126451 21389 16 Pass 0.0003 122986 21331 17 Pass 0.0003 119221 21265 17 Pass 0.0003 115521 21194 18 Pass 0.0004 112377 21130 18 Pass 0.0004 108912 21040 19 Pass 0.0004 105511 20974 19 Pass 0.0004 102623 20903 20 Pass 0.0004 99522 20831 20 Pass 0.0004 96528 20747 21 Pass 0.0004 93918 20677 22 Pass 0.0004 91116 20606 22 Pass 0.0004 88443 20542 23 Pass 0.0004 86197 20467 23 Pass 0.0004 83716 20403 24 Pass 0.0004 81320 20326 24 Pass 0.0005 79203 20277 25 Pass 0.0005 76936 20212 26 Pass 0.0005 74754 20150 26 Pass 0.0005 72872 20099 27 Pass 0.0005 70904 20031 28 Pass 0.0005 69000 19960 28 Pass 0.0005 67246 19900 29 Pass 0.0005 65407 19840 30 Pass 0.0005 63653 19780 31 Pass 0.0005 62134 19725 31 Pass 0.0005 60530 19661 32 Pass 0.0006 59033 19592 33 Pass 0.0006 57686 19541 33 Pass 0.0006 56167 19464 34 Pass 0.0006 54713 19395 35 Pass 0.0006 53472 19338 36 Pass 0.0006 52125 19278 36 Pass 0.0006 50798 19222 37 Pass 0.0006 49665 19164 38 Pass 21027 Renton N 35th-R1 12/10/2021 7:40:19 AM Page 33 0.0006 48403 19081 39 Pass 0.0006 47226 19019 40 Pass 0.0006 46157 18972 41 Pass 0.0006 44981 18921 42 Pass 0.0007 43911 18850 42 Pass 0.0007 42970 18792 43 Pass 0.0007 41965 18745 44 Pass 0.0007 40938 18694 45 Pass 0.0007 40083 18642 46 Pass 0.0007 39077 18589 47 Pass 0.0007 38158 18531 48 Pass 0.0007 37323 18467 49 Pass 0.0007 36404 18416 50 Pass 0.0007 35527 18367 51 Pass 0.0007 34800 18317 52 Pass 0.0008 33965 18264 53 Pass 0.0008 33131 18217 54 Pass 0.0008 32447 18168 55 Pass 0.0008 31698 18116 57 Pass 0.0008 30928 18067 58 Pass 0.0008 30287 17999 59 Pass 0.0008 29538 17943 60 Pass 0.0008 28875 17885 61 Pass 0.0008 28276 17830 63 Pass 0.0008 27592 17763 64 Pass 0.0008 26971 17712 65 Pass 0.0008 26415 17665 66 Pass 0.0009 25816 17609 68 Pass 0.0009 25239 17560 69 Pass 0.0009 24747 17520 70 Pass 0.0009 24212 17470 72 Pass 0.0009 23699 17423 73 Pass 0.0009 23250 17378 74 Pass 0.0009 22779 17314 76 Pass 0.0009 22287 17259 77 Pass 0.0009 21902 17220 78 Pass 0.0009 21453 17165 80 Pass 0.0009 21012 17126 81 Pass 0.0010 20636 17088 82 Pass 0.0010 20227 17032 84 Pass 0.0010 19783 16974 85 Pass 0.0010 19404 16938 87 Pass 0.0010 18995 16897 88 Pass 0.0010 18595 16839 90 Pass 0.0010 18253 16790 91 Pass 0.0010 17881 16737 93 Pass 0.0010 17543 16698 95 Pass 21027 Renton N 35th-R1 12/10/2021 7:40:47 AM Page 34 Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.0010 17543 16698 95 Pass 0.0011 16159 16478 101 Fail 0.0011 14968 16273 108 Fail 0.0011 13856 16072 115 Fail 0.0012 12820 15883 123 Fail 0.0012 11819 15699 132 Fail 0.0013 10895 15488 142 Fail 0.0013 10119 15276 150 Fail 0.0013 9385 15079 160 Fail 0.0014 8735 14906 170 Fail 0.0014 8158 14728 180 Fail 0.0015 7591 14561 191 Fail 0.0015 7058 14388 203 Fail 0.0015 6590 14228 215 Fail 0.0016 6149 14029 228 Fail 0.0016 5781 13864 239 Fail 0.0017 5437 13689 251 Fail 0.0017 5095 13528 265 Fail 0.0017 4808 13362 277 Fail 0.0018 4524 13201 291 Fail 0.0018 4254 13036 306 Fail 0.0019 4019 12874 320 Fail 0.0019 3779 12705 336 Fail 0.0019 3546 12577 354 Fail 0.0020 3337 12416 372 Fail 0.0020 3138 12284 391 Fail 0.0021 2954 12121 410 Fail 0.0021 2787 11961 429 Fail 0.0021 2597 11804 454 Fail 0.0022 2447 11674 477 Fail 0.0022 2304 11520 500 Fail 0.0023 2162 11381 526 Fail 0.0023 2027 11240 554 Fail 0.0023 1895 11101 585 Fail 0.0024 1790 10975 613 Fail 0.0024 1687 10844 642 Fail 0.0025 1586 10731 676 Fail 0.0025 1483 10613 715 Fail 0.0025 1381 10481 758 Fail 0.0026 1292 10359 801 Fail 0.0026 1217 10230 840 Fail 0.0027 1154 10096 874 Fail 0.0027 1098 9995 910 Fail 0.0027 1048 9865 941 Fail 0.0028 996 9751 979 Fail 0.0028 930 9636 1036 Fail 0.0029 883 9514 1077 Fail 0.0029 837 9394 1122 Fail 0.0029 789 9281 1176 Fail 0.0030 743 9167 1233 Fail 0.0030 713 9067 1271 Fail 0.0031 668 8962 1341 Fail 0.0031 630 8855 1405 Fail 0.0032 596 8772 1471 Fail 21027 Renton N 35th-R1 12/10/2021 7:40:47 AM Page 35 0.0032 566 8675 1532 Fail 0.0032 539 8583 1592 Fail 0.0033 496 8483 1710 Fail 0.0033 473 8378 1771 Fail 0.0034 434 8288 1909 Fail 0.0034 399 8192 2053 Fail 0.0034 366 8096 2212 Fail 0.0035 348 7995 2297 Fail 0.0035 323 7901 2446 Fail 0.0036 296 7815 2640 Fail 0.0036 272 7726 2840 Fail 0.0036 256 7636 2982 Fail 0.0037 235 7557 3215 Fail 0.0037 217 7480 3447 Fail 0.0038 195 7401 3795 Fail 0.0038 180 7304 4057 Fail 0.0038 158 7221 4570 Fail 0.0039 145 7133 4919 Fail 0.0039 129 7052 5466 Fail 0.0040 119 6977 5863 Fail 0.0040 109 6909 6338 Fail 0.0040 97 6838 7049 Fail 0.0041 91 6772 7441 Fail 0.0041 82 6699 8169 Fail 0.0042 76 6613 8701 Fail 0.0042 68 6536 9611 Fail 0.0042 61 6462 10593 Fail 0.0043 54 6389 11831 Fail 0.0043 48 6323 13172 Fail 0.0044 41 6267 15285 Fail 0.0044 38 6190 16289 Fail 0.0044 33 6104 18496 Fail 0.0045 27 6034 22348 Fail 0.0045 22 5963 27104 Fail 0.0046 21 5897 28080 Fail 0.0046 20 5852 29260 Fail 0.0046 19 5777 30405 Fail 0.0047 17 5713 33605 Fail 0.0047 14 5649 40350 Fail 0.0048 12 5589 46575 Fail 0.0048 8 5529 69112 Fail 0.0048 4 5473 136825 Fail 0.0049 3 5418 180600 Fail 0.0049 3 5369 178966 Fail 0.0050 3 5315 177166 Fail 0.0050 3 5260 175333 Fail The development has an increase in flow durations from 1/2 Predeveloped 2 year flow to the 2 year flow or more than a 10% increase from the 2 year to the 50 year flow. The development has an increase in flow durations for more than 50% of the flows for the range of the duration analysis. 21027 Renton N 35th-R1 12/10/2021 7:40:47 AM Page 36 Water Quality Water Quality BMP Flow and Volume for POC #2 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. 21027 Renton N 35th-R1 12/10/2021 7:40:47 AM Page 37 LID Report 21027 Renton N 35th-R1 12/10/2021 7:40:47 AM Page 38 POC 3 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #3 Total Pervious Area:0.18424 Total Impervious Area:0.10264 Mitigated Landuse Totals for POC #3 Total Pervious Area:0.11532 Total Impervious Area:0.17157 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #3 Return Period Flow(cfs) 2 year 0.051884 5 year 0.07187 10 year 0.086446 25 year 0.106437 50 year 0.122504 100 year 0.139605 Flow Frequency Return Periods for Mitigated. POC #3 Return Period Flow(cfs) 2 year 0.067671 5 year 0.085906 10 year 0.098343 25 year 0.114525 50 year 0.126943 100 year 0.13969 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #3 Year Predeveloped Mitigated 21027 Renton N 35th-R1 12/10/2021 7:42:32 AM Page 39 1949 0.077 0.090 1950 0.076 0.092 1951 0.048 0.058 1952 0.031 0.047 1953 0.033 0.051 1954 0.042 0.056 1955 0.045 0.062 1956 0.045 0.061 1957 0.058 0.071 1958 0.039 0.056 1959 0.033 0.055 1960 0.050 0.061 1961 0.047 0.060 1962 0.034 0.051 1963 0.046 0.058 1964 0.041 0.055 1965 0.062 0.072 1966 0.034 0.049 1967 0.077 0.081 1968 0.070 0.091 1969 0.056 0.065 1970 0.048 0.064 1971 0.057 0.075 1972 0.074 0.080 1973 0.030 0.045 1974 0.056 0.069 1975 0.059 0.076 1976 0.043 0.055 1977 0.040 0.056 1978 0.049 0.068 1979 0.059 0.093 1980 0.087 0.090 1981 0.052 0.071 1982 0.087 0.099 1983 0.054 0.079 1984 0.038 0.051 1985 0.052 0.069 1986 0.048 0.060 1987 0.060 0.091 1988 0.033 0.055 1989 0.041 0.069 1990 0.139 0.137 1991 0.099 0.101 1992 0.038 0.051 1993 0.029 0.043 1994 0.028 0.046 1995 0.045 0.062 1996 0.064 0.071 1997 0.055 0.067 1998 0.044 0.064 1999 0.114 0.130 2000 0.052 0.067 2001 0.046 0.071 2002 0.077 0.087 2003 0.060 0.071 2004 0.104 0.124 2005 0.048 0.060 2006 0.045 0.053 21027 Renton N 35th-R1 12/10/2021 7:42:32 AM Page 40 2007 0.126 0.119 2008 0.097 0.100 2009 0.059 0.085 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #3 Rank Predeveloped Mitigated 1 0.1390 0.1368 2 0.1261 0.1303 3 0.1144 0.1245 4 0.1042 0.1194 5 0.0990 0.1013 6 0.0970 0.0997 7 0.0875 0.0992 8 0.0869 0.0932 9 0.0774 0.0916 10 0.0773 0.0912 11 0.0768 0.0910 12 0.0760 0.0903 13 0.0744 0.0902 14 0.0703 0.0869 15 0.0638 0.0846 16 0.0615 0.0807 17 0.0605 0.0797 18 0.0601 0.0785 19 0.0594 0.0764 20 0.0594 0.0748 21 0.0591 0.0723 22 0.0579 0.0712 23 0.0573 0.0711 24 0.0561 0.0708 25 0.0556 0.0707 26 0.0554 0.0706 27 0.0536 0.0692 28 0.0523 0.0686 29 0.0521 0.0685 30 0.0515 0.0681 31 0.0504 0.0675 32 0.0493 0.0671 33 0.0484 0.0650 34 0.0479 0.0639 35 0.0478 0.0637 36 0.0478 0.0622 37 0.0473 0.0619 38 0.0460 0.0609 39 0.0458 0.0609 40 0.0452 0.0604 41 0.0446 0.0600 42 0.0446 0.0597 43 0.0445 0.0583 44 0.0440 0.0579 45 0.0432 0.0558 46 0.0417 0.0556 47 0.0414 0.0556 48 0.0410 0.0555 49 0.0404 0.0553 50 0.0390 0.0549 51 0.0383 0.0547 21027 Renton N 35th-R1 12/10/2021 7:42:32 AM Page 41 52 0.0380 0.0532 53 0.0343 0.0510 54 0.0339 0.0509 55 0.0333 0.0508 56 0.0331 0.0506 57 0.0327 0.0486 58 0.0314 0.0471 59 0.0299 0.0462 60 0.0294 0.0455 61 0.0276 0.0430 21027 Renton N 35th-R1 12/10/2021 7:42:32 AM Page 42 LID Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.0042 92849 104805 112 Fail 0.0044 86967 100335 115 Fail 0.0046 81598 96121 117 Fail 0.0048 76636 92186 120 Fail 0.0050 72037 88357 122 Fail 0.0053 67909 84721 124 Fail 0.0055 63931 81299 127 Fail 0.0057 60252 78069 129 Fail 0.0059 56787 75011 132 Fail 0.0061 53622 72209 134 Fail 0.0064 50691 69492 137 Fail 0.0066 47954 66926 139 Fail 0.0068 45387 64444 141 Fail 0.0070 42885 62028 144 Fail 0.0072 40639 59782 147 Fail 0.0075 38628 57600 149 Fail 0.0077 36703 55547 151 Fail 0.0079 34842 53536 153 Fail 0.0081 33110 51654 156 Fail 0.0083 31420 49815 158 Fail 0.0086 29859 48082 161 Fail 0.0088 28340 46328 163 Fail 0.0090 26950 44788 166 Fail 0.0092 25667 43270 168 Fail 0.0094 24447 41751 170 Fail 0.0097 23250 40232 173 Fail 0.0099 22137 38863 175 Fail 0.0101 21079 37559 178 Fail 0.0103 20135 36254 180 Fail 0.0105 19209 35035 182 Fail 0.0108 18305 33837 184 Fail 0.0110 17487 32725 187 Fail 0.0112 16700 31655 189 Fail 0.0114 15969 30629 191 Fail 0.0116 15254 29645 194 Fail 0.0119 14598 28704 196 Fail 0.0121 13935 27784 199 Fail 0.0123 13334 26886 201 Fail 0.0125 12756 26030 204 Fail 0.0127 12254 25153 205 Fail 0.0130 11770 24340 206 Fail 0.0132 11261 23570 209 Fail 0.0134 10741 22800 212 Fail 0.0136 10271 22030 214 Fail 0.0138 9850 21346 216 Fail 0.0141 9462 20713 218 Fail 0.0143 9086 20071 220 Fail 0.0145 8744 19475 222 Fail 0.0147 8414 18876 224 Fail 0.0149 8115 18311 225 Fail 0.0152 7805 17753 227 Fail 0.0154 7499 17188 229 Fail 0.0156 7178 16675 232 Fail 0.0158 6870 16170 235 Fail 21027 Renton N 35th-R1 12/10/2021 7:42:32 AM Page 43 0.0160 6586 15669 237 Fail 0.0163 6344 15203 239 Fail 0.0165 6121 14737 240 Fail 0.0167 5865 14341 244 Fail 0.0169 5649 13943 246 Fail 0.0171 5433 13567 249 Fail 0.0174 5270 13199 250 Fail 0.0176 5071 12797 252 Fail 0.0178 4879 12438 254 Fail 0.0180 4703 12057 256 Fail 0.0182 4543 11706 257 Fail 0.0185 4372 11368 260 Fail 0.0187 4216 11034 261 Fail 0.0189 4045 10744 265 Fail 0.0191 3906 10401 266 Fail 0.0193 3758 10136 269 Fail 0.0196 3630 9875 272 Fail 0.0198 3499 9608 274 Fail 0.0200 3373 9347 277 Fail 0.0202 3258 9112 279 Fail 0.0204 3127 8868 283 Fail 0.0207 3024 8618 284 Fail 0.0209 2926 8389 286 Fail 0.0211 2836 8179 288 Fail 0.0213 2744 7940 289 Fail 0.0215 2644 7734 292 Fail 0.0218 2560 7533 294 Fail 0.0220 2475 7330 296 Fail 0.0222 2393 7152 298 Fail 0.0224 2312 6943 300 Fail 0.0226 2239 6755 301 Fail 0.0229 2169 6556 302 Fail 0.0231 2118 6385 301 Fail 0.0233 2058 6222 302 Fail 0.0235 2001 6040 301 Fail 0.0237 1944 5873 302 Fail 0.0240 1877 5704 303 Fail 0.0242 1829 5561 304 Fail 0.0244 1773 5414 305 Fail 0.0246 1717 5270 306 Fail 0.0248 1686 5148 305 Fail 0.0251 1631 5020 307 Fail 0.0253 1576 4875 309 Fail 0.0255 1537 4750 309 Fail 0.0257 1489 4641 311 Fail 0.0259 1439 4528 314 Fail The development has an increase in flow durations from 1/2 Predeveloped 2 year flow to the 2 year flow or more than a 10% increase from the 2 year to the 50 year flow. The development has an increase in flow durations for more than 50% of the flows for the range of the duration analysis. 21027 Renton N 35th-R1 12/10/2021 7:43:02 AM Page 44 Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.0259 1439 4528 314 Fail 0.0269 1272 4008 315 Fail 0.0279 1133 3621 319 Fail 0.0289 1002 3260 325 Fail 0.0298 901 2926 324 Fail 0.0308 800 2642 330 Fail 0.0318 712 2387 335 Fail 0.0328 648 2167 334 Fail 0.0337 575 1946 338 Fail 0.0347 510 1753 343 Fail 0.0357 473 1604 339 Fail 0.0367 444 1445 325 Fail 0.0376 402 1295 322 Fail 0.0386 373 1179 316 Fail 0.0396 342 1078 315 Fail 0.0406 317 982 309 Fail 0.0415 295 898 304 Fail 0.0425 278 808 290 Fail 0.0435 258 735 284 Fail 0.0445 237 682 287 Fail 0.0454 212 635 299 Fail 0.0464 194 578 297 Fail 0.0474 182 534 293 Fail 0.0484 166 499 300 Fail 0.0494 153 455 297 Fail 0.0503 144 422 293 Fail 0.0513 139 384 276 Fail 0.0523 124 360 290 Fail 0.0533 118 338 286 Fail 0.0542 114 316 277 Fail 0.0552 110 288 261 Fail 0.0562 105 274 260 Fail 0.0572 101 252 249 Fail 0.0581 96 232 241 Fail 0.0591 89 214 240 Fail 0.0601 83 203 244 Fail 0.0611 76 187 246 Fail 0.0620 71 170 239 Fail 0.0630 69 159 230 Fail 0.0640 64 153 239 Fail 0.0650 60 142 236 Fail 0.0659 58 133 229 Fail 0.0669 55 128 232 Fail 0.0679 53 118 222 Fail 0.0689 48 110 229 Fail 0.0698 48 103 214 Fail 0.0708 45 97 215 Fail 0.0718 42 89 211 Fail 0.0728 41 83 202 Fail 0.0737 40 82 205 Fail 0.0747 38 79 207 Fail 0.0757 36 76 211 Fail 0.0767 34 68 200 Fail 0.0776 30 65 216 Fail 21027 Renton N 35th-R1 12/10/2021 7:43:02 AM Page 45 0.0786 29 61 210 Fail 0.0796 28 60 214 Fail 0.0806 26 56 215 Fail 0.0815 25 53 211 Fail 0.0825 23 51 221 Fail 0.0835 22 49 222 Fail 0.0845 21 47 223 Fail 0.0854 21 44 209 Fail 0.0864 21 41 195 Fail 0.0874 18 36 200 Fail 0.0884 15 34 226 Fail 0.0893 15 34 226 Fail 0.0903 14 28 200 Fail 0.0913 14 24 171 Fail 0.0923 14 21 150 Fail 0.0932 14 18 128 Fail 0.0942 13 18 138 Fail 0.0952 12 18 150 Fail 0.0962 12 17 141 Fail 0.0971 11 16 145 Fail 0.0981 10 16 160 Fail 0.0991 8 14 175 Fail 0.1001 8 12 150 Fail 0.1010 6 12 200 Fail 0.1020 6 9 150 Fail 0.1030 5 9 180 Fail 0.1040 5 8 160 Fail 0.1049 4 8 200 Fail 0.1059 4 8 200 Fail 0.1069 3 8 266 Fail 0.1079 3 8 266 Fail 0.1088 3 8 266 Fail 0.1098 3 8 266 Fail 0.1108 3 8 266 Fail 0.1118 3 7 233 Fail 0.1128 3 7 233 Fail 0.1137 3 7 233 Fail 0.1147 2 7 350 Fail 0.1157 2 7 350 Fail 0.1167 2 7 350 Fail 0.1176 2 5 250 Fail 0.1186 2 5 250 Fail 0.1196 2 3 150 Fail 0.1206 2 3 150 Fail 0.1215 2 3 150 Fail 0.1225 2 3 150 Fail The development has an increase in flow durations from 1/2 Predeveloped 2 year flow to the 2 year flow or more than a 10% increase from the 2 year to the 50 year flow. The development has an increase in flow durations for more than 50% of the flows for the range of the duration analysis. 21027 Renton N 35th-R1 12/10/2021 7:43:02 AM Page 46 Water Quality Water Quality BMP Flow and Volume for POC #3 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. 21027 Renton N 35th-R1 12/10/2021 7:43:02 AM Page 47 LID Report 21027 Renton N 35th-R1 12/10/2021 7:43:02 AM Page 48 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. 21027 Renton N 35th-R1 12/10/2021 7:43:02 AM Page 49 Appendix Predeveloped Schematic 21027 Renton N 35th-R1 12/10/2021 7:43:03 AM Page 50 Mitigated Schematic 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 51 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 21027 Renton N 35th-R1.wdm MESSU 25 Pre21027 Renton N 35th-R1.MES 27 Pre21027 Renton N 35th-R1.L61 28 Pre21027 Renton N 35th-R1.L62 30 POC21027 Renton N 35th-R11.dat 31 POC21027 Renton N 35th-R12.dat 32 POC21027 Renton N 35th-R13.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 10 PERLND 16 IMPLND 4 IMPLND 5 IMPLND 8 COPY 501 COPY 502 COPY 503 DISPLY 1 DISPLY 2 DISPLY 3 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 East Lot Pre-Dev MAX 1 2 30 9 2 West Lot Pre-Dev MAX 1 2 31 9 3 Existing Conditions MAX 1 2 32 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 502 1 1 503 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 10 C, Forest, Flat 1 1 1 1 27 0 16 C, Lawn, Flat 1 1 1 1 27 0 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 52 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 10 0 0 1 0 0 0 0 0 0 0 0 0 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 10 0 0 4 0 0 0 0 0 0 0 0 0 1 9 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 10 0 0 0 0 0 0 0 0 0 0 0 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 10 0 4.5 0.08 400 0.05 0.5 0.996 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 10 0 0 2 2 0 0 0 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 10 0.2 0.5 0.35 6 0.5 0.7 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 10 0 0 0 0 2.5 1 0 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 4 ROOF TOPS/FLAT 1 1 1 27 0 5 DRIVEWAYS/FLAT 1 1 1 27 0 8 SIDEWALKS/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 4 0 0 1 0 0 0 5 0 0 1 0 0 0 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 53 8 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 4 0 0 4 0 0 0 1 9 5 0 0 4 0 0 0 1 9 8 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 4 0 0 0 0 0 5 0 0 0 0 0 8 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 4 400 0.01 0.1 0.1 5 400 0.01 0.1 0.1 8 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 4 0 0 5 0 0 8 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 4 0 0 5 0 0 8 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** East Lot Pre-Dev*** PERLND 10 0.06942 COPY 501 12 PERLND 10 0.06942 COPY 501 13 West Lot Pre-Dev*** PERLND 10 0.06944 COPY 502 12 PERLND 10 0.06944 COPY 502 13 Existing Conditions*** PERLND 16 0.18424 COPY 503 12 PERLND 16 0.18424 COPY 503 13 IMPLND 4 0.05466 COPY 503 15 IMPLND 5 0.02307 COPY 503 15 IMPLND 8 0.02491 COPY 503 15 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 COPY 502 OUTPUT MEAN 1 1 48.4 DISPLY 2 INPUT TIMSER 1 COPY 503 OUTPUT MEAN 1 1 48.4 DISPLY 3 INPUT TIMSER 1 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 54 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL COPY 502 OUTPUT MEAN 1 1 48.4 WDM 502 FLOW ENGL REPL COPY 503 OUTPUT MEAN 1 1 48.4 WDM 503 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 55 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 END MASS-LINK END RUN 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 56 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 21027 Renton N 35th-R1.wdm MESSU 25 Mit21027 Renton N 35th-R1.MES 27 Mit21027 Renton N 35th-R1.L61 28 Mit21027 Renton N 35th-R1.L62 32 POC21027 Renton N 35th-R13.dat 30 POC21027 Renton N 35th-R11.dat 31 POC21027 Renton N 35th-R12.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 IMPLND 4 IMPLND 5 IMPLND 8 PERLND 13 RCHRES 1 RCHRES 2 COPY 503 COPY 1 COPY 501 COPY 601 COPY 2 COPY 502 COPY 602 DISPLY 3 DISPLY 1 DISPLY 2 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 3 Developed Condition MAX 1 2 32 9 1 East Lot Gravel Trench MAX 1 2 30 9 2 West Lot Gravel Trench MAX 1 2 31 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 503 1 1 501 1 1 601 1 1 2 1 1 502 1 1 602 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 57 END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 13 C, Pasture, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 13 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 13 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 13 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 13 0 4.5 0.06 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 13 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 13 0.15 0.4 0.3 6 0.5 0.4 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 13 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 4 ROOF TOPS/FLAT 1 1 1 27 0 5 DRIVEWAYS/FLAT 1 1 1 27 0 8 SIDEWALKS/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 4 0 0 1 0 0 0 5 0 0 1 0 0 0 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 58 8 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 4 0 0 4 0 0 0 1 9 5 0 0 4 0 0 0 1 9 8 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 4 0 0 0 0 0 5 0 0 0 0 0 8 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 4 400 0.01 0.1 0.1 5 400 0.01 0.1 0.1 8 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 4 0 0 5 0 0 8 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 4 0 0 5 0 0 8 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** East Lot*** IMPLND 4 0.0573 RCHRES 1 5 IMPLND 5 0.01 RCHRES 1 5 IMPLND 8 0.0016 RCHRES 1 5 West Lot*** IMPLND 4 0.0573 RCHRES 2 5 IMPLND 5 0.01 RCHRES 2 5 IMPLND 8 0.0016 RCHRES 2 5 East Lot Bypass*** IMPLND 8 0.00055 COPY 501 15 IMPLND 8 0.00055 COPY 601 15 West Lot Bypass*** IMPLND 8 0.00055 COPY 502 15 IMPLND 8 0.00055 COPY 602 15 Developed Condition*** PERLND 13 0.11532 COPY 503 12 PERLND 13 0.11532 COPY 503 13 IMPLND 4 0.11465 COPY 503 15 IMPLND 5 0.04298 COPY 503 15 IMPLND 8 0.01394 COPY 503 15 ******Routing****** 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 59 IMPLND 4 0.05732 COPY 1 15 IMPLND 5 0.00996 COPY 1 15 IMPLND 8 0.00159 COPY 1 15 IMPLND 4 0.05732 COPY 2 15 IMPLND 5 0.00996 COPY 2 15 IMPLND 8 0.00161 COPY 2 15 RCHRES 1 1 COPY 501 17 RCHRES 2 1 COPY 502 17 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 503 OUTPUT MEAN 1 1 48.4 DISPLY 3 INPUT TIMSER 1 COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 COPY 502 OUTPUT MEAN 1 1 48.4 DISPLY 2 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 East Lot Gravel -007 2 1 1 1 28 0 1 2 West Lot Gravel -011 2 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 2 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** 1 0 1 0 0 4 5 0 0 0 0 0 0 0 0 2 2 2 2 2 2 0 1 0 0 4 5 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.01 0.0 0.0 0.5 0.0 2 2 0.01 0.0 0.0 0.5 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 5.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2 0 4.0 5.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 60 END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES FTABLE 1 92 5 Depth Area Volume Outflow1 Outflow2 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (cfs) (ft/sec) (Minutes)*** 0.000000 0.005280 0.000000 0.000000 0.000000 0.044444 0.005280 0.000082 0.000000 0.000599 0.088889 0.005280 0.000164 0.000000 0.000599 0.133333 0.005280 0.000246 0.000000 0.000599 0.177778 0.005280 0.000329 0.000000 0.000599 0.222222 0.005280 0.000411 0.000000 0.000599 0.266667 0.005280 0.000493 0.000000 0.000599 0.311111 0.005280 0.000575 0.000000 0.000599 0.355556 0.005280 0.000657 0.000000 0.000599 0.400000 0.005280 0.000739 0.000000 0.000599 0.444444 0.005280 0.000821 0.000000 0.000599 0.488889 0.005280 0.000903 0.000000 0.000599 0.533333 0.005280 0.000986 0.000000 0.000599 0.577778 0.005280 0.001068 0.000000 0.000599 0.622222 0.005280 0.001150 0.000000 0.000599 0.666667 0.005280 0.001232 0.000000 0.000599 0.711111 0.005280 0.001314 0.000000 0.000599 0.755556 0.005280 0.001396 0.000000 0.000599 0.800000 0.005280 0.001478 0.000000 0.000599 0.844444 0.005280 0.001561 0.000000 0.000599 0.888889 0.005280 0.001643 0.000000 0.000599 0.933333 0.005280 0.001725 0.000000 0.000599 0.977778 0.005280 0.001807 0.000000 0.000599 1.022222 0.005280 0.001889 0.000000 0.000599 1.066667 0.005280 0.001971 0.000000 0.000599 1.111111 0.005280 0.002053 0.000000 0.000599 1.155556 0.005280 0.002135 0.000000 0.000599 1.200000 0.005280 0.002218 0.000000 0.000599 1.244444 0.005280 0.002300 0.000000 0.000599 1.288889 0.005280 0.002382 0.000000 0.000599 1.333333 0.005280 0.002464 0.000000 0.000599 1.377778 0.005280 0.002546 0.000000 0.000599 1.422222 0.005280 0.002628 0.000000 0.000599 1.466667 0.005280 0.002710 0.000000 0.000599 1.511111 0.005280 0.002793 0.000000 0.000599 1.555556 0.005280 0.002875 0.000000 0.000599 1.600000 0.005280 0.002957 0.000000 0.000599 1.644444 0.005280 0.003039 0.000000 0.000599 1.688889 0.005280 0.003121 0.000000 0.000599 1.733333 0.005280 0.003203 0.000000 0.000599 1.777778 0.005280 0.003285 0.000000 0.000599 1.822222 0.005280 0.003368 0.000000 0.000599 1.866667 0.005280 0.003450 0.000000 0.000599 1.911111 0.005280 0.003532 0.000000 0.000599 1.955556 0.005280 0.003614 0.000000 0.000599 2.000000 0.005280 0.003696 0.000000 0.000599 2.044444 0.005280 0.003778 0.000000 0.000599 2.088889 0.005280 0.003860 0.000000 0.000599 2.133333 0.005280 0.003942 0.000000 0.000599 2.177778 0.005280 0.004025 0.000000 0.000599 2.222222 0.005280 0.004107 0.000000 0.000599 2.266667 0.005280 0.004189 0.000000 0.000599 2.311111 0.005280 0.004271 0.000000 0.000599 2.355556 0.005280 0.004353 0.000000 0.000599 2.400000 0.005280 0.004435 0.000000 0.000599 2.444444 0.005280 0.004517 0.000000 0.000599 2.488889 0.005280 0.004600 0.000000 0.000599 2.533333 0.005280 0.004682 0.000000 0.000599 2.577778 0.005280 0.004764 0.000000 0.000599 2.622222 0.005280 0.004846 0.000000 0.000599 2.666667 0.005280 0.004928 0.000000 0.000599 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 61 2.711111 0.005280 0.005010 0.000000 0.000599 2.755556 0.005280 0.005092 0.000000 0.000599 2.800000 0.005280 0.005174 0.000000 0.000599 2.844444 0.005280 0.005257 0.000000 0.000599 2.888889 0.005280 0.005339 0.000000 0.000599 2.933333 0.005280 0.005421 0.000000 0.000599 2.977778 0.005280 0.005503 0.000000 0.000599 3.022222 0.005280 0.005585 0.000000 0.000599 3.066667 0.005280 0.005667 0.000000 0.000599 3.111111 0.005280 0.005749 0.000000 0.000599 3.155556 0.005280 0.005832 0.000000 0.000599 3.200000 0.005280 0.005914 0.000000 0.000599 3.244444 0.005280 0.005996 0.000000 0.000599 3.288889 0.005280 0.006078 0.000000 0.000599 3.333333 0.005280 0.006160 0.000000 0.000599 3.377778 0.005280 0.006242 0.000000 0.000599 3.422222 0.005280 0.006324 0.000000 0.000599 3.466667 0.005280 0.006406 0.000000 0.000599 3.511111 0.005280 0.006489 0.000000 0.000599 3.555556 0.005280 0.006571 0.000000 0.000599 3.600000 0.005280 0.006653 0.000000 0.000599 3.644444 0.005280 0.006735 0.000000 0.000599 3.688889 0.005280 0.006817 0.000000 0.000599 3.733333 0.005280 0.006899 0.000000 0.000599 3.777778 0.005280 0.006981 0.000000 0.000599 3.822222 0.005280 0.007064 0.029284 0.000599 3.866667 0.005280 0.007146 0.151685 0.000599 3.911111 0.005280 0.007228 0.323094 0.000599 3.955556 0.005280 0.007310 0.523118 0.000599 4.000000 0.005280 0.007392 0.732975 0.000599 4.044444 0.005280 0.007627 0.933531 0.000599 END FTABLE 1 FTABLE 2 92 5 Depth Area Volume Outflow1 Outflow2 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (cfs) (ft/sec) (Minutes)*** 0.000000 0.005280 0.000000 0.000000 0.000000 0.044444 0.005280 0.000082 0.000000 0.000599 0.088889 0.005280 0.000164 0.000000 0.000599 0.133333 0.005280 0.000246 0.000000 0.000599 0.177778 0.005280 0.000329 0.000000 0.000599 0.222222 0.005280 0.000411 0.000000 0.000599 0.266667 0.005280 0.000493 0.000000 0.000599 0.311111 0.005280 0.000575 0.000000 0.000599 0.355556 0.005280 0.000657 0.000000 0.000599 0.400000 0.005280 0.000739 0.000000 0.000599 0.444444 0.005280 0.000821 0.000000 0.000599 0.488889 0.005280 0.000903 0.000000 0.000599 0.533333 0.005280 0.000986 0.000000 0.000599 0.577778 0.005280 0.001068 0.000000 0.000599 0.622222 0.005280 0.001150 0.000000 0.000599 0.666667 0.005280 0.001232 0.000000 0.000599 0.711111 0.005280 0.001314 0.000000 0.000599 0.755556 0.005280 0.001396 0.000000 0.000599 0.800000 0.005280 0.001478 0.000000 0.000599 0.844444 0.005280 0.001561 0.000000 0.000599 0.888889 0.005280 0.001643 0.000000 0.000599 0.933333 0.005280 0.001725 0.000000 0.000599 0.977778 0.005280 0.001807 0.000000 0.000599 1.022222 0.005280 0.001889 0.000000 0.000599 1.066667 0.005280 0.001971 0.000000 0.000599 1.111111 0.005280 0.002053 0.000000 0.000599 1.155556 0.005280 0.002135 0.000000 0.000599 1.200000 0.005280 0.002218 0.000000 0.000599 1.244444 0.005280 0.002300 0.000000 0.000599 1.288889 0.005280 0.002382 0.000000 0.000599 1.333333 0.005280 0.002464 0.000000 0.000599 1.377778 0.005280 0.002546 0.000000 0.000599 1.422222 0.005280 0.002628 0.000000 0.000599 1.466667 0.005280 0.002710 0.000000 0.000599 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 62 1.511111 0.005280 0.002793 0.000000 0.000599 1.555556 0.005280 0.002875 0.000000 0.000599 1.600000 0.005280 0.002957 0.000000 0.000599 1.644444 0.005280 0.003039 0.000000 0.000599 1.688889 0.005280 0.003121 0.000000 0.000599 1.733333 0.005280 0.003203 0.000000 0.000599 1.777778 0.005280 0.003285 0.000000 0.000599 1.822222 0.005280 0.003368 0.000000 0.000599 1.866667 0.005280 0.003450 0.000000 0.000599 1.911111 0.005280 0.003532 0.000000 0.000599 1.955556 0.005280 0.003614 0.000000 0.000599 2.000000 0.005280 0.003696 0.000000 0.000599 2.044444 0.005280 0.003778 0.000000 0.000599 2.088889 0.005280 0.003860 0.000000 0.000599 2.133333 0.005280 0.003942 0.000000 0.000599 2.177778 0.005280 0.004025 0.000000 0.000599 2.222222 0.005280 0.004107 0.000000 0.000599 2.266667 0.005280 0.004189 0.000000 0.000599 2.311111 0.005280 0.004271 0.000000 0.000599 2.355556 0.005280 0.004353 0.000000 0.000599 2.400000 0.005280 0.004435 0.000000 0.000599 2.444444 0.005280 0.004517 0.000000 0.000599 2.488889 0.005280 0.004600 0.000000 0.000599 2.533333 0.005280 0.004682 0.000000 0.000599 2.577778 0.005280 0.004764 0.000000 0.000599 2.622222 0.005280 0.004846 0.000000 0.000599 2.666667 0.005280 0.004928 0.000000 0.000599 2.711111 0.005280 0.005010 0.000000 0.000599 2.755556 0.005280 0.005092 0.000000 0.000599 2.800000 0.005280 0.005174 0.000000 0.000599 2.844444 0.005280 0.005257 0.000000 0.000599 2.888889 0.005280 0.005339 0.000000 0.000599 2.933333 0.005280 0.005421 0.000000 0.000599 2.977778 0.005280 0.005503 0.000000 0.000599 3.022222 0.005280 0.005585 0.000000 0.000599 3.066667 0.005280 0.005667 0.000000 0.000599 3.111111 0.005280 0.005749 0.000000 0.000599 3.155556 0.005280 0.005832 0.000000 0.000599 3.200000 0.005280 0.005914 0.000000 0.000599 3.244444 0.005280 0.005996 0.000000 0.000599 3.288889 0.005280 0.006078 0.000000 0.000599 3.333333 0.005280 0.006160 0.000000 0.000599 3.377778 0.005280 0.006242 0.000000 0.000599 3.422222 0.005280 0.006324 0.000000 0.000599 3.466667 0.005280 0.006406 0.000000 0.000599 3.511111 0.005280 0.006489 0.000000 0.000599 3.555556 0.005280 0.006571 0.000000 0.000599 3.600000 0.005280 0.006653 0.000000 0.000599 3.644444 0.005280 0.006735 0.000000 0.000599 3.688889 0.005280 0.006817 0.000000 0.000599 3.733333 0.005280 0.006899 0.000000 0.000599 3.777778 0.005280 0.006981 0.000000 0.000599 3.822222 0.005280 0.007064 0.029284 0.000599 3.866667 0.005280 0.007146 0.151685 0.000599 3.911111 0.005280 0.007228 0.323094 0.000599 3.955556 0.005280 0.007310 0.523118 0.000599 4.000000 0.005280 0.007392 0.732975 0.000599 4.044444 0.005280 0.007627 0.933531 0.000599 END FTABLE 2 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 63 EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR O 1 1 1 WDM 1001 FLOW ENGL REPL RCHRES 1 HYDR O 2 1 1 WDM 1002 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1003 STAG ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL COPY 601 OUTPUT MEAN 1 1 48.4 WDM 901 FLOW ENGL REPL RCHRES 2 HYDR RO 1 1 1 WDM 1004 FLOW ENGL REPL RCHRES 2 HYDR O 1 1 1 WDM 1005 FLOW ENGL REPL RCHRES 2 HYDR O 2 1 1 WDM 1006 FLOW ENGL REPL RCHRES 2 HYDR STAGE 1 1 1 WDM 1007 STAG ENGL REPL COPY 2 OUTPUT MEAN 1 1 48.4 WDM 702 FLOW ENGL REPL COPY 502 OUTPUT MEAN 1 1 48.4 WDM 802 FLOW ENGL REPL COPY 602 OUTPUT MEAN 1 1 48.4 WDM 902 FLOW ENGL REPL COPY 3 OUTPUT MEAN 1 1 48.4 WDM 703 FLOW ENGL REPL COPY 503 OUTPUT MEAN 1 1 48.4 WDM 803 FLOW ENGL REPL COPY 603 OUTPUT MEAN 1 1 48.4 WDM 903 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 17 RCHRES OFLOW OVOL 1 COPY INPUT MEAN END MASS-LINK 17 END MASS-LINK END RUN 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 64 Predeveloped HSPF Message File 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 65 Mitigated HSPF Message File 21027 Renton N 35th-R1 12/10/2021 7:43:04 AM Page 66 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2021; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com