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EdmondsApt_TIR_20170127_Resub.pdf TF ERRAORMA DESIGN GROUP PRELIMINARY TECHNICAL INFORMATION REPORT _______________________________________________________________________ EDMONDS APARTMENTS LOCATION: 8509 244 th Street SW Edmonds, WA 98026 RECEIVED 01/27/2017 ISSUE DATE: Development Services Ctr. January 13, 2017 City of Edmonds PREPARED FOR: Steven Barnes 1/13/2017 CIVIL ENGINEERING & LANDSCAPE ARCHITECTURE st phonewebsite 5027 51 Avenue SW Seattle WA 98136 206.923.0590 www.terraformadesigngroup.com EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ TABLE OF CONTENTS 1. PROJECT OVERVIEW & MAPS 1 2. EXISTING CONDITIONS SUMMARY 3 3. OFF-SITE ANALYSIS REPORT 5 4. SUMMARY OF MINIMUM REQUIREMENTS 5 5. PERMANENT STORMWATER CONTROL PLAN 11 6. CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN 15 7. SPECIAL REPORTS & STUDIES 15 8. OTHER PERMITS 15 9. OPERATION MAINTENANCE MANUAL, SOURCE CONTROL 15 10. BOND QUANTITIES WORKSHEET 15 APPENDIX A – DRAINAGE CALCULATIONS APPENDIX B – DOWNSTREAM STUDY APPENDIX C – GEOTECHNICAL REPORT APPENDIX D – SITE & DRAINAGE PLANS EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ SECTION 1 - PROJECT OVERVIEW AND MAPS This Preliminary Technical Information Report for the Edmonds Apartments has been submitted to the City of Edmonds as part of our SEPA and Design Review Application. Project Proponent: Roy Gursli Property Area: 0.67 acres Total Project Area: 0.69 acres th Site Location: 8509 SW 244 Street, Edmonds, WA 98026 SW ¼ of SEC. 31, T27N, R4E, Snohomish County Parcel ID: 00463303200303 Required Permits: Design Review, SEPA, Grading Permit, Building Permit, The proposed Edmonds Apartments development consists of a 2 building, 2-story, apartment complex th Street, in Edmonds, WA. The property currently includes 2 single family located at 8509 SW 244 homes with driveways and grass areas across the 0.67 acre property. The Applicant, Roy Gursli, proposes to develop the property for the proposed buildings, parking, landscaping, utilities and drainage facilities. The existing strutures, driveways and landscaping will be removed. The project will require drainage review from the City of Edmonds and compliance with the 2014 Washington State Department of Ecology Surface Water Design Manual as amended by the 2017 City of Edmonds Stormwater Code and 2017 Edmonds Stormwater Addendum. Since the development includes greater than 5000 sf of New Impervious Surface, all 10 Min. Technical Requirements apply. Onsite drainage improvements include roof drains, area drains and catch basins to collect the proposed roof, walkway, pavement and landscape areas. A bioretention swale is proposed at the southeast corner of the site provide provide Enhanced Treatment for the pollution generating impervious surfaces. An underground Stormtech chamber system is proposed for the onsite flow control. The Stormtech system and bioretention swale will also be open to the native subsoils thereby acting as a Stormwater Management BMP for limited onsite retention. Page 1 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ th ADDRESS: 8509 244 Street SW, Edmonds S–T–R: SW ¼ of SEC. 31, T27N, R4E, Snohomish County Page 2 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ SECTION 2 - EXISTING CONDITIONS SUMMARY The 0.67-acre property includes two single-family residential structures. Access to the site is provided by a paved driveway and access easement to 244th Street SW to the south. The site is bordered on the south, north and west by multi-family residential complexes. A commercial property is located along the east property boundary. Cover types on the site include two single-family residential structures, paved & gravel driveways, and areas of lawn and landscape. The site is flat to moderate in gradient and generally slopes downward from the west to the east property boundary. The elevation of the site ranges from about 458 feet (NAVD 88) in the west portion of the site to a low point of 440 feet in the southeast corner. Based on the Snohomish County Soil Survey (U.S. Department of Agriculture, 1983) the site and surrounding area consists of Vashon Lodgement Till to a depth of 8.5 feel below grade. Permeability of the lodgement till is relatively low, therefore, storm infiltration is unlikely for the site. The site is located within the Edmonds Way basin. No stormwater infrastructure currently exists on the property. Page 3 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ EXISTING SITE AERIAL Page 4 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ SECTION 3 - OFFSITE ANALYSIS REPORT Sheet flow from the southeast corner of the site follows the paved access driveway that enters the site and then flows to an adjacent parking lot to the east. Stormwater flows in a northerly direction across the parking lot and is collected in a Type 1 catch basin. An 8-inch diameter pipe conveys stormwater to the north to an outfall along the north edge of the parking lot. The pipe outfall is in an area of dense briars and flows towards a parcel that was deeded from WSDOT to Snohomish County for a pedestrian trail. We do not know of any drainage problems associated with the downstream system. The site is part of the Edmonds Way Basin which discharges directly to Puget Sound through the City’s MS4 conveyance system. See attached Downstream Analysis as prepared by Edward McCarthy, PE, within Appendix B of this report. SECTION 4 - SUMMARY OF MINUMUM REQUIREMENTS 9 Minimum Technical Requirements as provided within Section 5 of the Edmonds Stormwater Addendum Manual: Minimum Requirement #1 – Preparation of Stormwater Site Plan This Technical Information Report and the Civil Plans address the permanent drainage impacts of the project. Minimum Requirement #2 – Construction Stormwater Pollution Prevention An Erosion Control Plan and Construction Stormwater Pollution Prevention Plan (CSWPPP) will be prepared at the time of permit submittal. A Department of Ecology Construction Stormwater Permit will not be required since the disturbance area will not exceed one (1) acre. Minimum Requirement #3 - Source Control of Pollution The proposed multi-family residential development is a relatively low pollution generator. General source control pollution prevention plans and a storm operation and maintenance manual will be provided with the final permit submittal. Minimum Requirement #4 – Preservation of Natural Drainage Systems and Outfalls Runoff from the site sheet drains to the property to the east and ultimately to an overgrown area northeast of the site with the eastern neighbors property. Runoff from the proposed storm system will continue to discharge to this outfall point. Page 5 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ Minimum Requirement #5 – On-Site Stormwater Management Bioretention swales are proposed for water quality treatment of the pollution generating surfaces. These swales are an effective BMP to provide both treatment and Stormwater Management. Additionally, the proposed underground Stormtech chambers will be hydraulically open to the native soils and provide additional Stormwater Management. The proposed onsite planters will also receive BMP T5.13 (Post-Construction Soil Quality & Depth). This BMP will further assist with onsite runoff retention. We do not expect significant onsite runoff retention due to the native Lodgement Till soils underground. Minimum Requirement #6 – Runoff Treatment The proposed development triggers Enhanced Treatment. A bioretention swale will be provided for Enhanced Treatment for the pollution generating impervious surfaces. Minimum Requirement #7 – Flow Control As required by the City, flow control is required. The site is part of the Edmonds Way Basin which discharges directly to Puget Sound through the City’s MS4 conveyance system. The allowed flow control criteria for this system are as follows: The post-development 10- and 100-year recurrence peak flows shall not exceed 0.25 and 0.45 cfs per impervious area, respectively. The criteria allows for significantly reduce required stormwater volumes than experienced for typical projects that must meet a Forested predeveloped condition. An underground Stormtech chamber detention system is proposed within east edge of the parking lot and provides approximately 2200 cf of live-storage volume. Minimum Requirement #8 – Wetland Protection There are no wetlands within the proposed development area or immediate vicinity. Minimum Requirement #9 – Operation and Maintenance A Stormwater Operation Maintenance Manual and site Source Control measures will be included with the final permit submittal. Page 6 Page 7 Page 8 Page 9 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ Page 10 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ SECTION 5 - PERMANENT STORMWATER CONTROL PLAN Onsite drainage improvements include roof drains, area drains and catch basins to collect the proposed roof, walkway, pavement and landscape areas. A bioretention swale is proposed at the southeast corner of the site provide provide Enhanced Treatment for the pollution generating impervious surfaces. Design calculations are provided demonstrating runoff treatment to at least the 91% design storm event using the WWHM method. As required by the City, flow control is required. The site is part of the Edmonds Way Basin which discharges directly to Puget Sound through the City’s MS4 conveyance system. The allowed flow control criteria for this system are as follows: the post-development 10- and 100-year recurrence peak flows shall not exceed 0.25 and 0.45 cfs per impervious area, respectively. The criteria allows for significantly reduce required stormwater volumes than experienced for typical projects that must meet a Forested predeveloped condition. An underground Stormtech chamber detention system is proposed within east edge of the parking lot and provides approximately 2200 cf of live- storage volume. Runoff from the narrow north and east planter strips will sheet drain down into the adjacent properties. The volume of runoff will be very low. Approximately 800 sf of driveway area will drain into the access road to the south of our property. While this area was accounted for in my flow control calculations; the driveway grades are lower than the bioretention swale and would have required a pump to hydraulically connect this pavement area. Given that the neighboring property currently receives are existing asphalt driveway runoff, there should be no real change to the neighbor’s drainage conditions. On-site conveyance calculations meeting the 25-yr, 24-hr storm event (Rational Method) will be provided with the final permit submittal. Basin data and results are provided within the following pages. The WWHM files are provided within Appendix A of this report. Page 11 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ Page 12 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ STORMWATER DESIGN EDMONDS APARTMENTSP.A.D. Project Name: By: 150261/10/17 Project Number: Date: CITY OF EDMONDS DRAINAGE CRITERIA: WWHM (Western Washington Hydrology Manual) RAINFALL METHOD: Step 1) Site Data 1) General characteristics: BasinASoil typesilt Development typecommercialSoil GroupC Size (ac.)0.67Existing surfaceroof, gravel, grass Detention/RetentionDetentionPredev Coverforest Treatment CriteriaEnhancedOil Controlno 2) Rainfall Data:WS-DOT Data: DOT Region - Puget East; Isohyetal Value= 36 3) Existing onsite characteristics: Pervious acres20532sf = 0.47acres grass20532sf = 0.47acres 4568 Impervious acres8685sf = 0.20acres roof2422sf = 0.06acres pavement 2146sf = 0.05acres gravel 4117sf = 0.09acres Total:29217sf = 0.67acres 3) Developed onsite characteristics: Pervious acres5138sf = 0.12acres landscape5138sf = 0.12acres Impervious acres:24079sf = 0.55acres roof9066sf = 0.21acres paving14289sf = 0.33acres pond724sf = 0.02acres Total:29217sf = 0.67acres Prevdeveloped Developed Peak Flow RatePeak Flow Rate Runoff Discharge Rates(cfs)(cfs) 2-yr0.01140.1726 10-yr0.02100.2835 100-yr0.02830.4656 Step 2) Developed stormwater discharge criteria 1. Flow control required per Edmonds Way Basin criteria. Post-Development 10-, and 100-year recurrence interval peak flows shall not exceed 0.25 and 0.45 cfs per acre of impervious area. 2. Enhanced Treatment required for commercial project 3. Storm outfall to adjacent property to east. Page 13 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ Step 3) Modeled Detention Facility Proposed underground detention vault (for WWHM modeling purposes) 14Bot. Orifice Dia (in) =1.0 Length (ft)= Width (ft)282nd Orifice Dia (in) =1.0 Live-Storage Depth (ft)=52nd Orifice Ht (ft) =3.2 Live-Storage Volume (cf)=1960 Developed 10-year discharge (cfs)=0.1074=0.19cfs/ac of impervious (<0.25 ok) Developed 100-year discharge (cfs)=0.2220=0.40cfs/ac of impervious (<0.45 ok) Step 4) Proposed Detention Facility Proposed 14 ~ MC-3500 Stormtech Chambers. Live-Storage Depth = 4.75 feet Live-Storage Volume = 2200 cf <ok> Step 5) Bioretention Swale Basin Area 3) Developed onsite characteristics: Pervious acres1805sf = 0.04acres landscape1805sf = 0.04acres Impervious acres:12185sf = 0.28acres roof0sf = 0.00acres paving11545sf = 0.27acres pond640sf = 0.01acres Total:13990sf = 0.32acres Swale Length (ft) =33 Swale Width (ft) =8 Max. Design Depth (Ft) =1.0 % Design Storm Treated 95.2% (>91%, ok) Page 14 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ SECTION 6 - CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN An Erosion Control Plan and Construction Stormwater Pollution Prevention Plan will be prepared with the building permit submittal. SECTION 7 - SPECIAL REPORTS & STUDIES SOILS REPORT A Subsurface Exploration, Geological Hazard and Geotechnical Engineering Report was prepared by Associated Earth Sciences, Inc. (AES) dated February 11, 2016. : Soil ConditionsThe generally consists of approximately 6 inches of sod / topsoil over Vashon Lodgement Till to the max exploration depths of 5.5 to 8.5 feet below grade. Groundwater was not encountered in any of the exploration pits at the time of the exploration (September 28, 2015). Permeability of the lodgement till is relatively low, and storm water infiltration into the till is not likely. The full Geotechnical Report is provided within Appendix C of this report. SECTION 8 - OTHER PERMITS A Department of Ecology Construction Stormwater Permit will not be applied for since the site clearing area is less than 1 acre. SECTION 9 - OPERATION MAINTENANCE MANUAL, SOURCE CONTROL A Stormwater Operation Maintenance Manual and site Source Control measures will be included with the final permit application. SECTION 10 - BOND QUANTITIES WORKSHEET A Bond Quantities Worksheet will be prepared and submitted upon request from the City. Page 15 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ APPENDIX A – DRAINAGE CALCULATIONS WWHM2012 PROJECT REPORT General Model Information Project Name:Edmonds Apts Detention Site Name:Edmonds Apts Site Address: City: Report Date:1/11/2017 MGS Region:Puget East Data Start:1901/10/1 Data End:2058/09/30 Timestep:15 Minute DOT Data Number:03 Version Date:2016/02/25 Version:4.2.12 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year Edmonds Apts Detention1/11/2017 2:30:25 PMPage 2 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Useacre C, Forest, Mod0.67 Pervious Total0.67 Impervious Land Useacre Impervious Total0 Basin Total0.67 Element Flows To: SurfaceInterflowGroundwater Edmonds Apts Detention1/11/2017 2:30:25 PMPage 3 Mitigated Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Useacre C, Lawn, Mod0.12 Pervious Total0.12 Impervious Land Useacre ROADS FLAT0.33 ROOF TOPS FLAT0.21 POND0.02 Impervious Total0.56 Basin Total0.68 Element Flows To: SurfaceInterflowGroundwater Vault 1Vault 1 Edmonds Apts Detention1/11/2017 2:30:25 PMPage 4 WQ Bypass:No GroundWater:No Pervious Land Useacre C, Lawn, Mod0.04 Pervious Total0.04 Impervious Land Useacre PARKING MOD0.27 POND0.01 Impervious Total0.28 Basin Total0.32 Element Flows To: SurfaceInterflowGroundwater Surface retention 1Surface retention 1 Edmonds Apts Detention1/11/2017 2:30:25 PMPage 5 Routing Elements Predeveloped Routing Edmonds Apts Detention1/11/2017 2:30:26 PMPage 6 Mitigated Routing Vault 1 Width:28 ft. Length:14 ft. Depth:6 ft. Discharge Structure Riser Height:5 ft. Riser Diameter:18 in. Orifice 1 Diameter:1 in.Elevation:0 ft. Orifice 2 Diameter:1 in.Elevation:3.2 ft. Element Flows To: Outlet 1Outlet 2 Vault Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.00000.0090.0000.0000.000 0.06670.0090.0000.0070.000 0.13330.0090.0010.0090.000 0.20000.0090.0010.0120.000 0.26670.0090.0020.0140.000 0.33330.0090.0030.0150.000 0.40000.0090.0030.0170.000 0.46670.0090.0040.0180.000 0.53330.0090.0040.0190.000 0.60000.0090.0050.0210.000 0.66670.0090.0060.0220.000 0.73330.0090.0060.0230.000 0.80000.0090.0070.0240.000 0.86670.0090.0070.0250.000 0.93330.0090.0080.0260.000 1.00000.0090.0090.0270.000 1.06670.0090.0090.0280.000 1.13330.0090.0100.0280.000 1.20000.0090.0100.0290.000 1.26670.0090.0110.0300.000 1.33330.0090.0120.0310.000 1.40000.0090.0120.0320.000 1.46670.0090.0130.0320.000 1.53330.0090.0130.0330.000 1.60000.0090.0140.0340.000 1.66670.0090.0150.0350.000 1.73330.0090.0150.0350.000 1.80000.0090.0160.0360.000 1.86670.0090.0160.0370.000 1.93330.0090.0170.0370.000 2.00000.0090.0180.0380.000 2.06670.0090.0180.0390.000 2.13330.0090.0190.0390.000 2.20000.0090.0190.0400.000 2.26670.0090.0200.0400.000 2.33330.0090.0210.0410.000 2.40000.0090.0210.0420.000 2.46670.0090.0220.0420.000 2.53330.0090.0220.0430.000 Edmonds Apts Detention1/11/2017 2:30:26 PMPage 7 2.60000.0090.0230.0430.000 2.66670.0090.0240.0440.000 2.73330.0090.0240.0440.000 2.80000.0090.0250.0450.000 2.86670.0090.0250.0450.000 2.93330.0090.0260.0460.000 3.00000.0090.0270.0470.000 3.06670.0090.0270.0470.000 3.13330.0090.0280.0480.000 3.20000.0090.0280.0480.000 3.26670.0090.0290.0560.000 3.33330.0090.0300.0590.000 3.40000.0090.0300.0620.000 3.46670.0090.0310.0640.000 3.53330.0090.0310.0660.000 3.60000.0090.0320.0680.000 3.66670.0090.0330.0700.000 3.73330.0090.0330.0720.000 3.80000.0090.0340.0730.000 3.86670.0090.0340.0750.000 3.93330.0090.0350.0770.000 4.00000.0090.0360.0780.000 4.06670.0090.0360.0800.000 4.13330.0090.0370.0810.000 4.20000.0090.0370.0820.000 4.26670.0090.0380.0840.000 4.33330.0090.0390.0850.000 4.40000.0090.0390.0860.000 4.46670.0090.0400.0870.000 4.53330.0090.0400.0890.000 4.60000.0090.0410.0900.000 4.66670.0090.0420.0910.000 4.73330.0090.0420.0920.000 4.80000.0090.0430.0930.000 4.86670.0090.0430.0940.000 4.93330.0090.0440.0960.000 5.00000.0090.0450.0970.000 5.06670.0090.0450.3710.000 5.13330.0090.0460.8700.000 5.20000.0090.0461.5040.000 5.26670.0090.0472.2250.000 5.33330.0090.0482.9840.000 5.40000.0090.0483.7350.000 5.46670.0090.0494.4300.000 5.53330.0090.0495.0290.000 5.60000.0090.0505.5070.000 5.66670.0090.0515.8610.000 5.73330.0090.0516.1220.000 5.80000.0090.0526.4470.000 5.86670.0090.0526.7070.000 5.93330.0090.0536.9570.000 6.00000.0090.0547.1980.000 6.06670.0090.0547.4310.000 6.13330.0000.0007.6580.000 Edmonds Apts Detention1/11/2017 2:30:26 PMPage 8 Bioretention 1 Bottom Length: 33.00 ft. Bottom Width: 8.00 ft. Material thickness of first layer: 1.7 Material type for first layer: SMMWW 12 in/hr Material thickness of second layer: 1 Material type for second layer: Sand Material thickness of third layer: 0 Material type for third layer: GRAVEL Underdrain used Underdrain Diameter (feet):0.5 Orifice Diameter (in.):1 Offset (in.):0 Flow Through Underdrain (ac-ft.):109.705 Total Outflow (ac-ft.):115.3 Percent Through Underdrain:95.15 Discharge Structure Riser Height:1 ft. Riser Diameter:6 in. Element Flows To: Outlet 1Outlet 2 Bioretention Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.00000.00610.00000.00000.0000 0.04620.00610.00010.00000.0000 0.09230.00610.00030.00000.0000 0.13850.00610.00040.00000.0000 0.18460.00610.00050.00000.0000 0.23080.00610.00060.00000.0000 0.27690.00610.00080.00000.0000 0.32310.00610.00090.00010.0000 0.36920.00610.00100.00010.0000 0.41540.00610.00120.00010.0000 0.46150.00610.00130.00020.0000 0.50770.00610.00140.00020.0000 0.55380.00610.00150.00030.0000 0.60000.00610.00170.00040.0000 0.64620.00610.00180.00040.0000 0.69230.00610.00190.00060.0000 0.73850.00610.00200.00060.0000 0.78460.00610.00220.00070.0000 0.83080.00610.00230.00090.0000 0.87690.00610.00240.00090.0000 0.92310.00610.00260.00110.0000 0.96920.00610.00270.00120.0000 1.01540.00610.00280.00140.0000 1.06150.00610.00290.00160.0000 1.10770.00610.00310.00170.0000 1.15380.00610.00320.00200.0000 1.20000.00610.00330.00210.0000 1.24620.00610.00350.00230.0000 1.29230.00610.00360.00260.0000 1.33850.00610.00370.00270.0000 1.38460.00610.00380.00310.0000 Edmonds Apts Detention1/11/2017 2:30:26 PMPage 9 1.43080.00610.00400.00330.0000 1.47690.00610.00410.00350.0000 1.52310.00610.00420.00400.0000 1.56920.00610.00430.00400.0000 1.61540.00610.00450.00450.0000 1.66150.00610.00460.00480.0000 1.70770.00610.00470.00510.0000 1.75380.00610.00480.00570.0000 1.80000.00610.00490.00570.0000 1.84620.00610.00510.00630.0000 1.89230.00610.00520.00670.0000 1.93850.00610.00530.00700.0000 1.98460.00610.00540.00770.0000 2.03080.00610.00550.00780.0000 2.07690.00610.00560.00850.0000 2.12310.00610.00570.00900.0000 2.16920.00610.00580.00930.0000 2.21540.00610.00590.01010.0000 2.26150.00610.00610.01020.0000 2.30770.00610.00620.01100.0000 2.35380.00610.00630.01160.0000 2.40000.00610.00640.01190.0000 2.44620.00610.00650.01290.0000 2.49230.00610.00660.01310.0000 2.53850.00610.00670.01420.0000 2.58460.00610.00680.01420.0000 2.63080.00610.00700.01420.0000 2.67690.00610.00710.01420.0000 2.70000.00610.00710.01420.0000 Bioretention Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)To Amended(cfs)Infilt(cfs) 2.70000.00610.00710.00000.0142 0.0000 2.74620.00610.00740.00000.0142 0.0000 2.79230.00610.00770.00000.0142 0.0000 2.83850.00610.00800.00000.0142 0.0000 2.88460.00610.00820.00000.0142 0.0000 2.93080.00610.00850.00000.0142 0.0000 2.97690.00610.00880.00000.0142 0.0000 3.02310.00610.00910.00000.0142 0.0000 3.06920.00610.00940.00000.0142 0.0000 3.11540.00610.00960.00000.0142 0.0000 3.16150.00610.00990.00000.0142 0.0000 3.20770.00610.01020.00000.0142 0.0000 3.25380.00610.01050.00000.0142 0.0000 3.30000.00610.01080.00000.0142 0.0000 3.34620.00610.01100.00000.0142 0.0000 3.39230.00610.01130.00000.0142 0.0000 3.43850.00610.01160.00000.0142 0.0000 3.48460.00610.01190.00000.0142 0.0000 3.53080.00610.01220.00000.0142 0.0000 3.57690.00610.01240.00000.0142 0.0000 3.62310.00610.01270.00000.0142 0.0000 3.66920.00610.01300.00000.0142 0.0000 3.71540.00610.01330.01010.0142 0.0000 3.76150.00610.01360.08010.0142 0.0000 3.80770.00610.01380.17740.0142 0.0000 3.85380.00610.01410.27430.0142 0.0000 Edmonds Apts Detention1/11/2017 2:30:26 PMPage 10 3.90000.00610.01440.34650.0142 0.0000 3.94620.00610.01470.38690.0142 0.0000 3.99230.00610.01500.42570.0142 0.0000 4.03850.00610.01520.45810.0142 0.0000 4.08460.00610.01550.48830.0142 0.0000 4.13080.00610.01580.51680.0142 0.0000 4.17690.00610.01610.54380.0142 0.0000 4.20000.00610.01620.56950.0142 0.0000 Edmonds Apts Detention1/11/2017 2:30:26 PMPage 11 Surface retention 1 Element Flows To: Outlet 1Outlet 2 Bioretention 1 Edmonds Apts Detention1/11/2017 2:30:26 PMPage 12 Analysis Results POC 1 + Predevelopedx Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.67 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0.12 Total Impervious Area:0.56 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return PeriodFlow(cfs) 2 year0.011369 5 year0.017644 10 year0.021049 25 year0.024511 50 year0.026567 100 year0.028257 Flow Frequency Return Periods for Mitigated. POC #1 Return PeriodFlow(cfs) 2 year0.055062 5 year0.08314 10 year0.107402 25 year0.145757 50 year0.18081 100 year0.222249 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 YearPredevelopedMitigated 19020.0160.067 19030.0060.044 19040.0100.070 19050.0060.043 19060.0030.039 19070.0180.087 19080.0110.052 19090.0120.047 19100.0190.082 19110.0100.046 Edmonds Apts Detention1/11/2017 2:30:26 PMPage 13 19120.0340.145 19130.0170.046 19140.0040.081 19150.0060.037 19160.0090.048 19170.0040.047 19180.0110.048 19190.0080.042 19200.0100.045 19210.0110.042 19220.0120.063 19230.0080.048 19240.0050.042 19250.0050.038 19260.0100.047 19270.0130.045 19280.0080.043 19290.0180.080 19300.0110.048 19310.0110.048 19320.0070.046 19330.0090.043 19340.0250.090 19350.0090.043 19360.0150.049 19370.0120.085 19380.0120.047 19390.0010.039 19400.0100.072 19410.0100.043 19420.0150.072 19430.0050.053 19440.0120.199 19450.0110.074 19460.0100.042 19470.0070.047 19480.0230.093 19490.0190.096 19500.0100.042 19510.0120.039 19520.0330.262 19530.0300.257 19540.0090.047 19550.0080.041 19560.0050.033 19570.0130.045 19580.0310.095 19590.0190.056 19600.0070.039 19610.0190.089 19620.0100.067 19630.0050.037 19640.0090.063 19650.0230.091 19660.0040.038 19670.0090.039 19680.0120.061 19690.0080.045 Edmonds Apts Detention1/11/2017 2:31:39 PMPage 14 19700.0130.059 19710.0240.096 19720.0160.205 19730.0180.075 19740.0100.047 19750.0260.158 19760.0120.081 19770.0070.040 19780.0220.090 19790.0060.043 19800.0110.042 19810.0110.044 19820.0080.037 19830.0180.076 19840.0050.061 19850.0110.058 19860.0090.043 19870.0180.083 19880.0140.062 19890.0110.044 19900.0140.048 19910.0100.078 19920.0160.079 19930.0130.058 19940.0230.083 19950.0060.036 19960.0260.066 19970.0120.047 19980.0110.077 19990.0010.040 20000.0090.047 20010.0060.041 20020.0160.069 20030.0120.065 20040.0130.063 20050.0160.065 20060.0080.037 20070.0090.084 20080.0120.043 20090.0070.044 20100.0060.080 20110.0080.037 20120.0100.142 20130.0090.041 20140.0060.040 20150.0230.070 20160.0030.034 20170.0180.211 20180.0320.088 20190.0340.267 20200.0100.045 20210.0150.077 20220.0050.044 20230.0120.044 20240.0270.121 20250.0100.043 20260.0180.070 20270.0080.048 Edmonds Apts Detention1/11/2017 2:31:39 PMPage 15 20280.0040.033 20290.0130.047 20300.0250.094 20310.0070.039 20320.0050.036 20330.0060.034 20340.0070.047 20350.0280.152 20360.0140.056 20370.0030.042 20380.0140.079 20390.0010.043 20400.0050.061 20410.0080.048 20420.0290.181 20430.0130.070 20440.0170.063 20450.0110.043 20460.0130.047 20470.0080.044 20480.0110.081 20490.0100.070 20500.0070.048 20510.0110.143 20520.0070.047 20530.0120.048 20540.0150.094 20550.0050.039 20560.0040.044 20570.0080.041 20580.0090.044 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 RankPredevelopedMitigated 10.03440.2665 20.03430.2623 30.03340.2569 40.03150.2106 50.03120.2054 60.02960.1987 70.02870.1810 80.02760.1581 90.02670.1518 100.02610.1451 110.02580.1430 120.02500.1423 130.02460.1213 140.02440.0963 150.02320.0963 160.02320.0950 170.02290.0941 180.02250.0940 190.02250.0930 200.01940.0905 210.01940.0903 220.01910.0896 230.01900.0892 Edmonds Apts Detention1/11/2017 2:31:39 PMPage 16 240.01850.0882 250.01840.0872 260.01830.0851 270.01820.0837 280.01800.0832 290.01770.0830 300.01750.0819 310.01740.0813 320.01700.0808 330.01600.0806 340.01590.0803 350.01590.0801 360.01580.0793 370.01570.0788 380.01530.0780 390.01530.0766 400.01480.0766 410.01480.0756 420.01430.0754 430.01430.0740 440.01390.0724 450.01370.0722 460.01320.0705 470.01310.0704 480.01290.0698 490.01290.0697 500.01280.0696 510.01270.0687 520.01260.0666 530.01260.0665 540.01250.0660 550.01250.0651 560.01240.0647 570.01230.0632 580.01230.0631 590.01220.0628 600.01220.0625 610.01220.0619 620.01200.0615 630.01200.0611 640.01170.0607 650.01160.0589 660.01150.0584 670.01150.0581 680.01140.0560 690.01130.0558 700.01120.0532 710.01110.0523 720.01100.0493 730.01100.0482 740.01100.0482 750.01090.0481 760.01090.0478 770.01090.0478 780.01080.0477 790.01070.0477 800.01060.0476 810.01040.0476 Edmonds Apts Detention1/11/2017 2:31:40 PMPage 17 820.01030.0476 830.01030.0475 840.01030.0475 850.01030.0474 860.01020.0474 870.01020.0473 880.01010.0471 890.01010.0471 900.01000.0471 910.01000.0469 920.00990.0469 930.00990.0468 940.00990.0466 950.00980.0465 960.00930.0464 970.00920.0459 980.00920.0458 990.00920.0454 1000.00900.0454 1010.00900.0453 1020.00900.0450 1030.00890.0449 1040.00860.0445 1050.00860.0443 1060.00850.0443 1070.00840.0443 1080.00820.0440 1090.00810.0439 1100.00810.0437 1110.00810.0437 1120.00810.0436 1130.00800.0435 1140.00790.0435 1150.00770.0432 1160.00760.0432 1170.00760.0432 1180.00760.0431 1190.00740.0431 1200.00740.0430 1210.00720.0427 1220.00700.0427 1230.00690.0425 1240.00680.0423 1250.00680.0422 1260.00670.0421 1270.00660.0419 1280.00640.0417 1290.00620.0417 1300.00610.0416 1310.00600.0415 1320.00590.0414 1330.00580.0414 1340.00570.0405 1350.00550.0404 1360.00550.0396 1370.00550.0396 1380.00550.0394 1390.00550.0392 Edmonds Apts Detention1/11/2017 2:31:40 PMPage 18 1400.00550.0391 1410.00530.0390 1420.00520.0389 1430.00500.0388 1440.00480.0387 1450.00470.0380 1460.00460.0378 1470.00450.0372 1480.00440.0370 1490.00410.0369 1500.00400.0367 1510.00380.0365 1520.00310.0359 1530.00280.0357 1540.00260.0341 1550.00130.0338 1560.00080.0333 1570.00060.0333 Edmonds Apts Detention1/11/2017 2:31:40 PMPage 19 Duration Flows Flow(cfs)PredevMitPercentagePass/Fail 0.0057532836039011133Fail 0.0059490115967451217Fail 0.0061451365895881306Fail 0.0063417565824321394Fail 0.0065386405758261490Fail 0.0067358055681181586Fail 0.0070332285604111686Fail 0.0072309115527041788Fail 0.0074288685423551878Fail 0.0076269425318401974Fail 0.0078251745214912071Fail 0.0080234295116372183Fail 0.0082218665020032295Fail 0.0084203364927002422Fail 0.0086189154836162556Fail 0.0088176664748632688Fail 0.0091164934666062829Fail 0.0093154584583482965Fail 0.0095144514504213116Fail 0.0097134984426043279Fail 0.0099125954344563449Fail 0.0101118034264743613Fail 0.0103110714181073776Fail 0.0105104324097393927Fail 0.010798544015364074Fail 0.011093313936094218Fail 0.011287973859574387Fail 0.011483073788014560Fail 0.011678453713694733Fail 0.011873993643224923Fail 0.012070353572215077Fail 0.012266723504505252Fail 0.012463473434585411Fail 0.012660453364675566Fail 0.012957473298065738Fail 0.013154843230355890Fail 0.013352293165946054Fail 0.013549953102086210Fail 0.013747553037126387Fail 0.013945382974916555Fail 0.014143342912716720Fail 0.014341252850506910Fail 0.014539402788857078Fail 0.014837772728847224Fail 0.015036322669947351Fail 0.015234972613237472Fail 0.015433692557087590Fail 0.015632582502037679Fail 0.015831472448637780Fail 0.016030542392487833Fail 0.016229652339647890Fail 0.016428772287347950Fail 0.016727812237798046Fail 0.016926812188258162Fail Edmonds Apts Detention1/11/2017 2:31:40 PMPage 20 0.017125882139258266Fail 0.017324942091368385Fail 0.017523912044028548Fail 0.017722791996678761Fail 0.017921821949338933Fail 0.018120821904749148Fail 0.018319971858509306Fail 0.018619281815019413Fail 0.018818661772079496Fail 0.019017901730789669Fail 0.019217191688399821Fail 0.019416641647659901Fail 0.0196159616080210075Fail 0.0198153815683810197Fail 0.0200148315304010319Fail 0.0202142014929610513Fail 0.0204136214571810698Fail 0.0207129814197510937Fail 0.0209124213839611142Fail 0.0211118813503811366Fail 0.0213114613168011490Fail 0.0215110012843211675Fail 0.0217104512523911984Fail 0.0219100012232212232Fail 0.022195411923912498Fail 0.022391711626612678Fail 0.022687711334812924Fail 0.022883011032113291Fail 0.023078810751313643Fail 0.023275410476113894Fail 0.023471010211814382Fail 0.02366669958614952Fail 0.02386279705415479Fail 0.02405959468615913Fail 0.02425559231916634Fail 0.02455168995217432Fail 0.02474648764018887Fail 0.02494238538320185Fail 0.02513928301621177Fail 0.02533608086922463Fail 0.02553347883223602Fail 0.02573067674025078Fail 0.02592867475826139Fail 0.02612647266627525Fail 0.02642477079528661Fail 0.02662336886829557Fail 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. Edmonds Apts Detention1/11/2017 2:31:40 PMPage 21 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. Edmonds Apts Detention1/11/2017 2:31:40 PMPage 22 LID Report Edmonds Apts Detention1/11/2017 2:31:40 PMPage 23 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. Edmonds Apts Detention1/11/2017 2:32:33 PMPage 24 Appendix Predeveloped Schematic Edmonds Apts Detention1/11/2017 2:32:33 PMPage 25 Mitigated Schematic Edmonds Apts Detention1/11/2017 2:32:33 PMPage 26 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1901 10 01 END 2058 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 Edmonds Apts Detention.wdm MESSU 25 PreEdmonds Apts Detention.MES 27 PreEdmonds Apts Detention.L61 28 PreEdmonds Apts Detention.L62 30 POCEdmonds Apts Detention1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 C, Forest, Mod 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 11 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO Edmonds Apts Detention1/11/2017 2:32:33 PMPage 27 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 11 0 4.5 0.08 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 11 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 Edmonds Apts Detention1/11/2017 2:32:33 PMPage 28 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 11 0.67 COPY 501 12 PERLND 11 0.67 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 DIV PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 DIV IMPLND 1 999 EXTNL PREC Edmonds Apts Detention1/11/2017 2:32:33 PMPage 29 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN Edmonds Apts Detention1/11/2017 2:32:33 PMPage 30 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1901 10 01 END 2058 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 Edmonds Apts Detention.wdm MESSU 25 MitEdmonds Apts Detention.MES 27 MitEdmonds Apts Detention.L61 28 MitEdmonds Apts Detention.L62 30 POCEdmonds Apts Detention1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 17 IMPLND 1 IMPLND 4 IMPLND 14 IMPLND 12 RCHRES 1 RCHRES 2 RCHRES 3 COPY 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Vault 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 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 *** 17 C, Lawn, Mod 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 17 0 0 1 0 0 0 0 0 0 0 0 0 Edmonds Apts Detention1/11/2017 2:32:33 PMPage 31 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 17 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 *** 17 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 17 0 4.5 0.03 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 17 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 17 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 17 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 1 ROADS/FLAT 1 1 1 27 0 4 ROOF TOPS/FLAT 1 1 1 27 0 14 POND 1 1 1 27 0 12 PARKING/MOD 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 1 0 0 1 0 0 0 4 0 0 1 0 0 0 14 0 0 1 0 0 0 12 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 1 0 0 4 0 0 0 1 9 4 0 0 4 0 0 0 1 9 14 0 0 4 0 0 0 1 9 12 0 0 4 0 0 0 1 9 END PRINT-INFO Edmonds Apts Detention1/11/2017 2:32:33 PMPage 32 IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 1 0 0 0 0 0 4 0 0 0 0 0 14 0 0 0 0 0 12 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 1 400 0.01 0.1 0.1 4 400 0.01 0.1 0.1 14 400 0.01 0.1 0.1 12 400 0.05 0.1 0.08 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 1 0 0 4 0 0 14 0 0 12 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 1 0 0 4 0 0 14 0 0 12 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 17 0.12 RCHRES 1 2 PERLND 17 0.12 RCHRES 1 3 IMPLND 1 0.33 RCHRES 1 5 IMPLND 4 0.21 RCHRES 1 5 IMPLND 14 0.02 RCHRES 1 5 WQ*** PERLND 17 0.04 RCHRES 2 2 PERLND 17 0.04 RCHRES 2 3 IMPLND 12 0.27 RCHRES 2 5 IMPLND 14 0.01 RCHRES 2 5 ******Routing****** PERLND 17 0.12 COPY 1 12 IMPLND 1 0.33 COPY 1 15 IMPLND 4 0.21 COPY 1 15 IMPLND 14 0.02 COPY 1 15 PERLND 17 0.12 COPY 1 13 RCHRES 2 1 RCHRES 3 8 RCHRES 1 1 COPY 501 16 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 Edmonds Apts Detention1/11/2017 2:32:33 PMPage 33 <-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 Vault 1 1 1 1 1 28 0 1 2 Surface retentio-010 3 1 1 1 28 0 1 3 Bioretention 1 1 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 0 0 0 0 3 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 3 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** 1 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 2 0 1 0 0 4 5 6 0 0 0 0 0 0 0 2 2 2 2 2 3 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.01 0.0 0.0 0.5 0.0 2 2 0.01 0.0 0.0 0.5 0.0 3 3 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 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2 0 4.0 5.0 6.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES FTABLE 1 92 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.008999 0.000000 0.000000 0.066667 0.008999 0.000600 0.007007 0.133333 0.008999 0.001200 0.009909 0.200000 0.008999 0.001800 0.012136 Edmonds Apts Detention1/11/2017 2:32:33 PMPage 34 0.266667 0.008999 0.002400 0.014013 0.333333 0.008999 0.003000 0.015667 0.400000 0.008999 0.003600 0.017163 0.466667 0.008999 0.004200 0.018538 0.533333 0.008999 0.004800 0.019818 0.600000 0.008999 0.005399 0.021020 0.666667 0.008999 0.005999 0.022157 0.733333 0.008999 0.006599 0.023239 0.800000 0.008999 0.007199 0.024272 0.866667 0.008999 0.007799 0.025263 0.933333 0.008999 0.008399 0.026217 1.000000 0.008999 0.008999 0.027137 1.066667 0.008999 0.009599 0.028027 1.133333 0.008999 0.010199 0.028889 1.200000 0.008999 0.010799 0.029727 1.266667 0.008999 0.011399 0.030541 1.333333 0.008999 0.011999 0.031335 1.400000 0.008999 0.012599 0.032109 1.466667 0.008999 0.013199 0.032864 1.533333 0.008999 0.013799 0.033603 1.600000 0.008999 0.014399 0.034326 1.666667 0.008999 0.014998 0.035033 1.733333 0.008999 0.015598 0.035727 1.800000 0.008999 0.016198 0.036408 1.866667 0.008999 0.016798 0.037076 1.933333 0.008999 0.017398 0.037732 2.000000 0.008999 0.017998 0.038377 2.066667 0.008999 0.018598 0.039012 2.133333 0.008999 0.019198 0.039636 2.200000 0.008999 0.019798 0.040250 2.266667 0.008999 0.020398 0.040856 2.333333 0.008999 0.020998 0.041452 2.400000 0.008999 0.021598 0.042040 2.466667 0.008999 0.022198 0.042620 2.533333 0.008999 0.022798 0.043192 2.600000 0.008999 0.023398 0.043757 2.666667 0.008999 0.023998 0.044314 2.733333 0.008999 0.024597 0.044865 2.800000 0.008999 0.025197 0.045409 2.866667 0.008999 0.025797 0.045946 2.933333 0.008999 0.026397 0.046477 3.000000 0.008999 0.026997 0.047002 3.066667 0.008999 0.027597 0.047522 3.133333 0.008999 0.028197 0.048035 3.200000 0.008999 0.028797 0.048544 3.266667 0.008999 0.029397 0.056054 3.333333 0.008999 0.029997 0.059454 3.400000 0.008999 0.030597 0.062174 3.466667 0.008999 0.031197 0.064539 3.533333 0.008999 0.031797 0.066677 3.600000 0.008999 0.032397 0.068651 3.666667 0.008999 0.032997 0.070501 3.733333 0.008999 0.033597 0.072251 3.800000 0.008999 0.034197 0.073919 3.866667 0.008999 0.034796 0.075518 3.933333 0.008999 0.035396 0.077058 4.000000 0.008999 0.035996 0.078546 4.066667 0.008999 0.036596 0.079987 4.133333 0.008999 0.037196 0.081387 4.200000 0.008999 0.037796 0.082751 4.266667 0.008999 0.038396 0.084080 4.333333 0.008999 0.038996 0.085379 4.400000 0.008999 0.039596 0.086650 4.466667 0.008999 0.040196 0.087894 4.533333 0.008999 0.040796 0.089114 4.600000 0.008999 0.041396 0.090311 4.666667 0.008999 0.041996 0.091487 4.733333 0.008999 0.042596 0.092642 4.800000 0.008999 0.043196 0.093779 4.866667 0.008999 0.043796 0.094899 Edmonds Apts Detention1/11/2017 2:32:33 PMPage 35 4.933333 0.008999 0.044395 0.096001 5.000000 0.008999 0.044995 0.097088 5.066667 0.008999 0.045595 0.371854 5.133333 0.008999 0.046195 0.870681 5.200000 0.008999 0.046795 1.504723 5.266667 0.008999 0.047395 2.225112 5.333333 0.008999 0.047995 2.984825 5.400000 0.008999 0.048595 3.735512 5.466667 0.008999 0.049195 4.430331 5.533333 0.008999 0.049795 5.029483 5.600000 0.008999 0.050395 5.507478 5.666667 0.008999 0.050995 5.861713 5.733333 0.008999 0.051595 6.122159 5.800000 0.008999 0.052195 6.447619 5.866667 0.008999 0.052795 6.707371 5.933333 0.008999 0.053395 6.957337 6.000000 0.008999 0.053994 7.198547 6.066667 0.008999 0.054594 7.431864 END FTABLE 1 FTABLE 3 60 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.006061 0.000000 0.000000 0.046154 0.006061 0.000128 0.000000 0.092308 0.006061 0.000256 0.000004 0.138462 0.006061 0.000384 0.000010 0.184615 0.006061 0.000512 0.000016 0.230769 0.006061 0.000640 0.000040 0.276923 0.006061 0.000767 0.000043 0.323077 0.006061 0.000895 0.000078 0.369231 0.006061 0.001023 0.000111 0.415385 0.006061 0.001151 0.000133 0.461538 0.006061 0.001279 0.000206 0.507692 0.006061 0.001407 0.000221 0.553846 0.006061 0.001535 0.000300 0.600000 0.006061 0.001663 0.000379 0.646154 0.006061 0.001791 0.000416 0.692308 0.006061 0.001919 0.000555 0.738462 0.006061 0.002047 0.000591 0.784615 0.006061 0.002175 0.000720 0.830769 0.006061 0.002302 0.000863 0.876923 0.006061 0.002430 0.000911 0.923077 0.006061 0.002558 0.001129 0.969231 0.006061 0.002686 0.001199 1.015385 0.006061 0.002814 0.001376 1.061538 0.006061 0.002942 0.001604 1.107692 0.006061 0.003070 0.001654 1.153846 0.006061 0.003198 0.001962 1.200000 0.006061 0.003326 0.002081 1.246154 0.006061 0.003454 0.002303 1.292308 0.006061 0.003582 0.002635 1.338462 0.006061 0.003710 0.002677 1.384615 0.006061 0.003837 0.003086 1.430769 0.006061 0.003965 0.003269 1.476923 0.006061 0.004093 0.003529 1.523077 0.006061 0.004221 0.003988 1.569231 0.006061 0.004349 0.004010 1.615385 0.006061 0.004477 0.004527 1.661538 0.006061 0.004605 0.004794 1.707692 0.006061 0.004717 0.005083 1.753846 0.006061 0.004829 0.005677 1.800000 0.006061 0.004941 0.005690 1.846154 0.006061 0.005053 0.006312 1.892308 0.006061 0.005164 0.006680 1.938462 0.006061 0.005276 0.006987 1.984615 0.006061 0.005388 0.007704 2.030769 0.006061 0.005500 0.007767 2.076923 0.006061 0.005612 0.008464 2.123077 0.006061 0.005724 0.008953 Edmonds Apts Detention1/11/2017 2:32:33 PMPage 36 2.169231 0.006061 0.005836 0.009267 2.215385 0.006061 0.005948 0.010113 2.261538 0.006061 0.006060 0.010242 2.307692 0.006061 0.006171 0.011005 2.353846 0.006061 0.006283 0.011634 2.400000 0.006061 0.006395 0.011942 2.446154 0.006061 0.006507 0.012925 2.492308 0.006061 0.006619 0.013132 2.538462 0.006061 0.006731 0.014171 2.584615 0.006061 0.006843 0.014171 2.630769 0.006061 0.006955 0.014171 2.676923 0.006061 0.007067 0.014171 2.700000 0.006061 0.014957 0.014171 END FTABLE 3 FTABLE 2 34 6 Depth Area Volume Outflow1 Outflow2 outflow 3 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (cfs) (cfs) (ft/sec) (Minutes)*** 0.000000 0.006061 0.000000 0.000000 0.000000 0.000000 0.046154 0.006061 0.000280 0.000000 0.014171 0.000000 0.092308 0.006061 0.000559 0.000000 0.014171 0.000000 0.138462 0.006061 0.000839 0.000000 0.014171 0.000000 0.184615 0.006061 0.001119 0.000000 0.014171 0.000000 0.230769 0.006061 0.001399 0.000000 0.014171 0.000000 0.276923 0.006061 0.001678 0.000000 0.014171 0.000000 0.323077 0.006061 0.001958 0.000000 0.014171 0.000000 0.369231 0.006061 0.002238 0.000000 0.014171 0.000000 0.415385 0.006061 0.002517 0.000000 0.014171 0.000000 0.461538 0.006061 0.002797 0.000000 0.014171 0.000000 0.507692 0.006061 0.003077 0.000000 0.014171 0.000000 0.553846 0.006061 0.003357 0.000000 0.014171 0.000000 0.600000 0.006061 0.003636 0.000000 0.014171 0.000000 0.646154 0.006061 0.003916 0.000000 0.014171 0.000000 0.692308 0.006061 0.004196 0.000000 0.014171 0.000000 0.738462 0.006061 0.004476 0.000000 0.014171 0.000000 0.784615 0.006061 0.004755 0.000000 0.014171 0.000000 0.830769 0.006061 0.005035 0.000000 0.014171 0.000000 0.876923 0.006061 0.005315 0.000000 0.014171 0.000000 0.923077 0.006061 0.005594 0.000000 0.014171 0.000000 0.969231 0.006061 0.005874 0.000000 0.014171 0.000000 1.015385 0.006061 0.006154 0.010119 0.014171 0.000000 1.061538 0.006061 0.006434 0.080126 0.014171 0.000000 1.107692 0.006061 0.006713 0.177386 0.014171 0.000000 1.153846 0.006061 0.006993 0.274281 0.014171 0.000000 1.200000 0.006061 0.007273 0.346488 0.014171 0.000000 1.246154 0.006061 0.007552 0.386942 0.014171 0.000000 1.292308 0.006061 0.007832 0.425716 0.014171 0.000000 1.338462 0.006061 0.008112 0.458094 0.014171 0.000000 1.384615 0.006061 0.008392 0.488329 0.014171 0.000000 1.430769 0.006061 0.008671 0.516799 0.014171 0.000000 1.476923 0.006061 0.008951 0.543781 0.014171 0.000000 1.500000 0.006061 0.009091 0.569485 0.014171 0.000000 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 DIV PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 DIV 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 WDM 2 PREC ENGL 1 DIV RCHRES 2 EXTNL PREC WDM 1 EVAP ENGL 0.5 RCHRES 2 EXTNL POTEV WDM 1 EVAP ENGL 0.76 RCHRES 3 EXTNL POTEV END EXT SOURCES Edmonds Apts Detention1/11/2017 2:32:33 PMPage 37 EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 8 RCHRES OFLOW OVOL 2 RCHRES INFLOW IVOL END MASS-LINK 8 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 END MASS-LINK END RUN Edmonds Apts Detention1/11/2017 2:32:34 PMPage 38 Predeveloped HSPF Message File Edmonds Apts Detention1/11/2017 2:32:34 PMPage 39 Mitigated HSPF Message File Edmonds Apts Detention1/11/2017 2:32:34 PMPage 40 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. 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Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com Edmonds Apts Detention1/11/2017 2:32:34 PMPage 41 EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ APPENDIX B – DOWNSTREAM STUDY TABLE OF CONTENTS LIST OF TABLES LIST OF FIGURES i Edmonds Apartments T1:SADM ASK TUDY REA EFINITION AND APS T2:RR ASK ESOURCE EVIEW 1 Edmonds Apartments T3:FI ASK IELD NSPECTION 2 Edmonds Apartments T4:DSDPD ASK RAINAGE YSTEM ESCRIPTION AND ROBLEM ESCRIPTIONS T5:MEPP ASK ITIGATION OF XISTING OR OTENTIAL ROBLEMS Stormwater Code Supplement to Edmonds Community Development Code Chapter 18.30 3 Edmonds Apartments R EFERENCES Exhibit A – Stormwater Code Supplement to Edmonds Community Development Code Chapter 18.30 Soil Survey of Snohomish County Area, Washington. 10 Edmonds Apartments Appendix A. Photos of the Site and Downstream System Edmonds Apartments Appendix A. Photos of the Site and Downstream System Appendix A. Photos of the Site and Downstream System Appendix A. Photos of the Site and Downstream System Appendix A. Photos of the Site and Downstream System EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ APPENDIX C – GEOTECHNICAL REPORT PROVIDED SEPARATELY TO CITY EDMONDS APARTMENTS: PRELIMINARY TECHNICAL INFORMATION REPORT ______________________________________________________________ APPENDIX D – SITE & DRAINAGE PLANS REVISIONS: EDMONDS, WA 98026 C1 931401 PROJECT NO:1/10/17 8509 244th ST SW EDMONDS APARTMENTS SHEET TITLE: PRELIMINARY DESIGN GROUP, INC. FT ORMAERRA REVISIONS: EDMONDS, WA 98026 C2 931401 PROJECT NO:1/13/17 8509 244th ST SW EDMONDS APARTMENTS SHEET TITLE: PRELIMINARY DETENTION SYSTEM DESIGN GROUP, INC. FT ORMAERRA BIO-RETENTION SWALE REVISIONS: EDMONDS, WA 98026 C3 931401 PROJECT NO:1/13/17 8509 244th ST SW EDMONDS APARTMENTS SHEET TITLE: PRELIMINARY DESIGN GROUP, INC. FT ORMAERRA