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HomeMy WebLinkAboutRS_Drainage_Report_191007_v1T ERRA F ORMA DESIGN GROUP C I V I L E N G I N E E R I N G & L A N D S C A P E A R C H I T E C T U R E 5027 51st Avenue SW, Seattle, WA 98136 phone 206.923.0590 website www.terraformadesigngroup.com TECHNICAL INFORMATION REPORT _________________________________________________________________ DUVALL AVE. NE OFFICE BUILDING LOCATION: 1625 Duvall Avenue NE Renton, WA 98059 ISSUE DATE: October 7, 2019 PREPARED FOR: Duvall & 17th LLC PREPARED BY: Terraforma Design Group, Inc. 5027 51st Avenue SW Seattle, WA 98136 TDG No. 19037 10/7/2019 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. TABLE OF CONTENTS TIR Worksheet 1 I. Project Overview 7 II. Conditions and Requirements Summary 13 III. Off-Site Analysis 18 IV. Flow Control and Water Quality Facility Design 21 V. Conveyance System Design 21 VI. Special Reports & Studies 21 VII. Other Permits 21 VIII. Erosion/Sedimentation Control Design 21 IX. Bond Quantities, Facilities Summaries, 21 and Declaration of Covenant X. Operation and Maintenance Manual 21 APPENDIX A – STORM CALCULATIONS APPENDIX B – STORM OPERATION & MAINTENANCE MANUAL APPENDIX C – GEOTECHNICAL REPORT DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. Page 1 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. I. Page 2 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. PR Page 3 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. OJ Page 4 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. EC Page 5 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. T Page 6 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. PROJECT OVERVIEW The proposed development consists of the demolition of an existing single family home / office building and construction of a new office building at 1625 Duvall Avenue NE, in Renton, Washington. The subject lot (Parcel #516970-0129) measures 0.20 acres and is located at the SW corner of Duvall Avenue NE and NE 17th Street. The property is zoned CA – Commercial Arterial. The proposed commercial construction requires a building and grading permit with the City of Renton. This Technical Information Report and preliminary civil engineering plans have been prepared in accordance with the 2017 City of Renton Surface Water Design Manual and were submitted with the Site Plan Review submittal to the City of Renton. The existing parcel consists of a previously construction single family home that has been used as a commercial office. The site is elevated approximately 7 – 9 feet above street grade with retaining wall along the north and east property lines / street frontages. A large gravel area provides access to it’s driveway along NE 17th Street. Onsite vegetation consists of lawn and a couple non- significant trees. The topography generally sheet drains towards NE 17th Street. There are no onsite drainage facilities. The existing onsite impervious area totals 2820 sf. The proposed new development will consist of an at-grade parking garage with elevated 2700 sf +/- 2nd level office building. Significant site excavation and export will be conducted to achieve the proposed grades. All onsite vegetation will be cleared. Most of the rockery and segmental wall along the east property line will be removed. The project will result in the following: Net Impervious Area Increase= 2767 sf Onsite New & Replaced Impervious Area= 5587 sf Onsite Pollution Generating Impervious Area= 1609 sf The proposed drainage system will predominately discharge to the existing storm system in NE 17th Street via a new underground storm drain. No flow control or water quality measures are proposed. Page 7 I. DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. Page 8 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. AERIAL – EXISTING CONDITIONS Page 9 ONE-STORY OFFICE BUILDING RH = 439.4' FF = 427.5' RAY R E SI D E N C E 4615 N E 1 7t h St PARC E L # 7 7 0 3 1 0 - 0 0 1 0 80.00'S1°53'35"WR=25.00' A=40.61' D=93°03'57" VALVOLIN E I N S T A N T O I L C H A N G E 1545 DUV A L L A V E N E PARCEL# 5 1 6 9 7 0 - 0 1 2 3 HEDGE ROCKGARDENEVLT SDMH RIM = 416.27 SDMH RIM = 416.65' CB RIM = 416.84' CB RIM = 417.87'N17°16'16"E43.18'N4°51'49"E12.08'N88°06'25"W 90.56' N88°06'25"W 103.48'SDP S88°06'25"E 4 1 6418418 418 420 422 424 426426424420422424NE 17TH STREET DUVALL AVE NEBASIN DATA - EXISTING Aplanter = 5568 sf Aimpervious =2820 sf Atotal =8388 sf DUVALL AVE NE OFFICE BLDG DRAINAGE BASIN MAP Page 10 RAY R E SI D E N C E 4615 N E 1 7t h St PARC E L # 7 7 0 3 1 0 - 0 0 1 0 80.00'S1°53'35"WR=25.00' A=40.61' D=93°03'57" VALVOLIN E I N S T A N T O I L C H A N G E 1545 DUV A L L A V E N E PARCEL# 5 1 6 9 7 0 - 0 1 2 3 N17°16'16"E43.18'N4°51'49"E12.08'N88°06'25"W 90.56' N88°06'25"W 103.48'SDS88°06'25"E 4 1 6418418 418 420 422 424 426426424420422424NEW ROOF3643 sfPAVINGPAVINGPAVING R/W R/WNEW WALKNEW WALK PLANTERPLANTERPLAN T E R NE 17TH STREET DUVALL AVE NEP/LP/LWALKONSITE BASIN DATA - DEVELOPED Aplanter = 2801 sf Aimpervious =5587 sf Atotal =8388 sf Pollution Generating Impervious Surface = 1609 sf DUVALL AVE NE OFFICE BLDG DRAINAGE BASIN MAP Page 11 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. STORMWATER DATA Project Name:DUVALL AVE DENTAL By: P.A.D. Project Number:19037 Date:9/23/19 DRAINAGE CRITERIA:CITY OF RENTON 2017 STORM MANUAL RAINFALL METHOD:WWHM Step 1) Site Data 1) General characteristics: Basin ONSITE Size (ac.)0.19 * excl. offsite road improvements Development type commercial Soil Group Glacial Till Detention/Retention Detention Existing surface dental office (converted home) Treatment Criteria Enhanced Predev Cover forest Oil Control no 2) Existing onsite characteristics: Pervious acres 0.19 acres Onsite Area; after R/W deed forest 0.19 acres Assume forested per DOE Manual 3) Developed onsite characteristics: Landscape 2801 sf = 0.06 acres Roof 3658 sf = 0.08 acres Paving 1609 sf = 0.04 acres Walk 320 sf = 0.01 acres Total 8388 sf = 0.19 acres Step 2) Developed stormwater discharge criteria Core Requirement #3 - Flow Control Flow Control Duration Standard Matching Forested Site Conditions: Developed discharge durations shall not exceed predeveloped durations for the range of predeveloped discharge rates from 50% of the 2-year peak flow up to the full 50-year peak flow. Developed peak discharge rates shall not exceed predeveloped peak discharge rates for the 2- and 10-year return periods. Assume forested (historical) site conditions as the predeveloped condition. Exemption from Flow Control The facility requirement in Flow Control Duration Standard Matching Forested Site Conditions Areas is waived for any threshold discharge area in which there is no more than a 0.15-cfs difference (when modeled using 15 minute time steps ) in the sum of developed 100-year peak flows for those target surfaces subject to this requirement and the sum of forested (historical) site conditions 100-year peak flows (modeled using same time step unit (e.g., 15 minute) used to calculate the developed flow) for the same surface areas. Use WWHM program, 15-min timesteps Q100,ex =0.035 cfs Q100,dev =0.124 cfs Q100 increase =0.089 cfs *** Since < 0.15 cfs increase, project is Exempt from Flow Control 2. Runoff Treatment: Exempt since < 5000 sf PGHS Page 12 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. II. CONDITIONS AND REQUIREMENTS SUMMARY This Technical Information Report and the proposed drainage plans have been prepared in accordance with the 2017 City of Renton Surface Water Design Manual. Full Drainage Review will be required. The project will be classified as a New Development. This storm drainage report will address the 9 core and 6 special requirements of the manual, including a Level 1 downstream analysis. Page 13 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. Core Requirement #1 - Discharge at the Natural Location The existing site predominately sheet drains towards NE 17th Street. The new drainage system will also predominately discharge to NE 17th Street via a new underground storm drain. Core Requirement #2 - Off-site Analysis A Level 1 Downstream Analysis is required for the development. The site drainage is part of the Honey Creek drainage basin. We do not know of any downstream drainage problems. See Section 3 of this Report for additional information. Core Requirement #3 - Flow Control The proposed commercial development will require compliance with the Flow Control Duration Standard (Forested) as > 2000 sf of new impervious area is proposed. The project involves approximately 5587 sf of impervious surface. Predeveloped and Developed Discharge Rates using the Western Washington Hydrology Model Existing 100-yr Discharge Rate (Forested) = 0.035 cfs Proposed 100-yr Discharge Rate = 0.124 cfs Net Increase = 0.089 cfs Since the net 100-yr increase in less than 0.15 cfs, the project qualifies for Exemption #2 of the City stormwater manual. No flow control measures are proposed. The project also include approximately 850 sf of additional impervious area within NE 17th Street and Duvall Avenue NE to construct sidewalks and widen the roadway in NE 17th Street. No flow control measures are proposed for this minor impervious area increase. Core Requirement #4 - Conveyance System The private drainage system predominately discharges to a proposed, onsite catch basin at the north driveway. A 6-inch storm drainage discharges the site runoff to the City system in NE 17th Street,. See Section 5 of this report Core Requirement #5 - Erosion and Sediment Control Erosion Control BMP’s will be provided for the project, including silt fencing, rock construction entrance, straw wattles, sediment pond and CB inlet protection. See Section 8 of this report. Page 14 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. Core Requirement #6 - Maintenance and Operations An Operations and Maintenance Manual for Storm Drainage Facilities is required. See Section 10 of this report. Core Requirement #7 - Financial Guarantees and Liability See Section 9 of this report. Core Requirement #8 - Water Quality We are exempt from Water Quality facilities since we will have less than 5000 sf of Pollution Generating Impervious Surfaces. Core Requirement #9 – On-Site BMPs Since the project exceeds 2000 sf of New plus Replaced Impervious Surfaces, the project will require Small Lot BMP Requirements (for sites/lots < 22,000 sf). Since the site is underlain by Vashon Lodgement Till, the site would not be able to infiltrate onsite runoff to meet the Low Impact Development Performance Standard. As required by the 2017 City of Renton SWDM, Section 1.2.9.2.1, the feasibility and applicability of each BMP method must be evaluated. The following is an outline of our landcover area and the viability of each Onsite Stormwater Management BMP (viability analysis noted in bold): 1. Full Dispersion The feasibility and applicability of full dispersion as detailed in Appendix C, Section C.2.1 must be evaluated for all target impervious surfaces. If feasible and applicable, full dispersion must be implemented as part of the proposed project. Typically, small lot full dispersion will be applicable only in subdivisions where enough forest was preserved by tract, easement, or covenant to meet the minimum design requirements for full dispersion in Appendix C, Section C.2.1.1 ~ Not feasible since no native vegetated areas exist. 2. Full Infiltration Where full dispersion of target impervious roof areas is not feasible or applicable, or will cause flooding or erosion impacts, the feasibility and applicability of full infiltration as detailed in Appendix C, Section C.2.2 must be evaluated (note, this will require a soils report for the site/lot). If feasible and applicable, full infiltration of roof runoff must be implemented as part of the proposed project. ~ Not feasible since the existing soils consist of Vashon Lodgement Till. There are no areas of sands or cobbles for which to infiltrate to. 3. Area Targeted BMPs All target impervious surfaces not mitigated by Requirements 1 and 2 above, must be mitigated to the maximum extent feasible using one or more BMPs from the following list. Use of a given BMP is subject to evaluation of its feasibility and applicability as detailed in Appendix C. Feasible BMPs are required to be implemented. The BMPs listed below may be located anywhere on the site/lot subject to the limitations and design specifications for each BMP. These BMPs must be implemented as part of the proposed project. Page 15 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. A. Full Infiltration per Appendix C, Section C.2.2, or per Section 5.2, whichever is applicable. ~ Not feasible since the existing soils consist of Vashon Lodgement Till. There are no areas of sands or cobbles for which to infiltrate to. B. Limited Infiltration per Appendix C, Section C.2.3, See 3A above. C. Rain Gardens per Appendix C, Section C.2.12, sized as follows: o Rain gardens have a maximum contributing area of 5,000 square feet. o Rain gardens must have a minimum horizontal projected surface area below the overflow that is at least 5% of the area draining to it. Not feasible since the existing soils consist of Vashon Lodgement Till. There are no areas of sands or cobbles for which to infiltrate to. Per review by the Associated Earth Sciences, any proposed stormwater infiltrated into the native weathered till horizon would tend to migrate laterally at a shallow depth atop the underlying till and likely daylight at downslope areas, potentially impacting of-site structures and properties. D. Bioretention per Appendix C, Section C.2.6: ~ See Item 3C above. ~ E. Permeable Pavement per Appendix C, Section C.2.7 ~ See Item 3C above. 4. All target impervious surfaces not mitigated by Requirements 1, 2 and 3 above, must be mitigated to the maximum extent feasible using the Basic Dispersion BMP described below. Use of Basic Dispersion is subject to evaluation of its feasibility and applicability as detailed in Appendix C. Feasible BMPs are required to be implemented. Basic Dispersion BMPs may be located anywhere on the site/lot subject to the limitations and design specifications cited in Appendix C. The BMP must be implemented as part of the proposed project. • Basic Dispersion per Appendix C, Section C.2.4, ~ Not feasible as we cannot meet the 50- foot minimum vegetated flow path requirement. 5. BMPs must be implemented, at minimum, for an impervious area equal to at least 10% of the site/lot for site/lot sizes up to 11,000 square feet and at least 20% of the site/lot for site/lot sizes between 11,000 and 22,000 square feet. For projects located in Zone 1 of the Aquifer Protection Area, these impervious area amounts must be doubled. Doubling of the minimum impervious area required for BMP implementation in Zone 1 of the Aquifer Protection Area is not required for projects located within 200 feet of a steep slope hazard area, landslide hazard, or erosion hazard area. If these minimum areas are not mitigated using feasible BMPs from Requirements 1, 2, 3, and 4 above, one or more BMPs from the following list are required to be implemented to achieve compliance. These BMPs must be implemented as part of the proposed project. • Reduced Impervious Surface Credit per Appendix C, Section C.2.9, • Native Growth Retention Credit per Appendix C, Section C.2.10. • Tree Retention Credit per Appendix C, Section C.2.14 ~ None of these conditions apply to this project. 6. The soil moisture holding capacity of new pervious surfaces (target pervious surfaces) must be protected in accordance with the soil amendment BMP as detailed in Appendix C, Section C.2.13. ~ The proposed project will be required to install Soil Amendment to the planter beds to provide adequate soil quality for the proposed landscape areas. 7. Any proposed connection of roof downspouts to the local drainage system must be via a perforated pipe connection as detailed in Appendix C, Section C.2.11. ~ See Item 3C above. Page 16 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. Special Requirement #1 - Other Adopted Area Specific Requirements We do not know of any area specific requirements for our immediate vicinity. Special Requirement #2 – Flood Hazard Area Delineation Not applicable. Site is not within a floodplain or floodway. Special Requirement #3 - Flood Protection Facilities Not applicable. Site is not within a floodplain or floodway. Special Requirement #4 - Source Control The proposed office building should not trigger any specific Source Control requirements. Special Requirement #5 - Oil Control The proposed office building is not classified as a high use site to trigger Oil Control. Special Requirement #6 – Aquifer Protection Area The site is not within an Aquifer Protection Area Page 17 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. III. OFF-SITE ANALYSIS A Level 1 Downstream Analysis is required for the development. The site drainage is part of the Honey Creek drainage basin. Site runoff will predominately outfall to an existing shallow 12” storm drain under the south side of NE 17th Street. Runoff then turns southward within Duvall Ave NE past NE Sunset Boulevard to about 719 feet beyond our outfall. The City storm main then turns westward under the existing Albertsons & Ace Hardware parking lot and Anacortes Ave. Runoff passes through a McDonald’s parking lot before outfalling into a into a stream and heavily vegetated area. We do not know of any downstream drainage problems. See attached: x Downstream Drainage Map x Off-Site Analysis Drainage System Table Page 18 Page 19 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 AlbertsonsAce Hardware parking lot ponding SITE DOWNSTREAM DRAINAGE MAP CITY OF RENTON SURFACE WATER DESIGN MANUAL 2017 City of Renton Surface Water Design Manual 12/12/2016 Ref 8-B-1 REFERENCE 8-B OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE CITY OF RENTON SURFACE WATER DESIGN MANUAL, CORE REQUIREMENT #2 Basin: Subbasin Name: Subbasin Number: Date Symbol Drainage Component Type, Name, and Size Drainage Component Description Slope Distance from Site Discharge Existing Problems Potential Problems Observations of Field Inspector, Resource Reviewer, or Resident See map Type: sheet flow, swale, stream, channel, pipe, pond, flow control/ treatment/on-site BMP/facility Size: diameter, surface area drainage basin, vegetation, cover, depth, type of sensitive area, volume % ¼ ml = 1,320 ft. Constrictions, under capacity, ponding, overtopping, flooding, habitat or organism destruction, scouring, bank sloughing, sedimentation, incision, other erosion Tributary area, likelihood of problem, overflow pathways, potential impacts Page 201 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 12" Poly 12" Poly 24" Poly 21" RCP 24" RCP 24" Poly 72"x44" pipe arch onsite discharge, road collector City storm main 0.63 2.00 0.53 0.03 0.64 2.73 2.72 1.31 0.65 5.00 1.46 0.87 1.50 0.52 0.14 0.15 0 63' 102' 138' 168' 226' 320' 405' 535' 555' 563' 661' 707' 719' 957' 1227' 1537' None Known None Known No observed Issues 1 n/a n/a 10/7/19 routes under Albertsons / Ace Hardware parking lot & Anacortes Ave DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. IV. FLOW CONTROL AND WATER QUALITY FACILITY DESIGN The project is exempt from Flow Control and Water Quality requirements. No such facilities are proposed. V. CONVEYANCE SYSTEMS ANALYSIS AND DESIGN The private drainage system predominately discharges to a proposed, onsite catch basin at the north driveway. A 6-inch storm drainage discharges the site runoff to the City system in NE 17th Street,. VI. SPECIAL REPORTS AND STUDIES A Subsurface Exploration, Geologic Hazard, and Geotechnical Engineering Report dated March 8, 2018 was prepared by Associated Earth Sciences, Inc. This report is included with Appendix C. VII. OTHER PERMITS Not Applicable. VIII. EROSION/SEDIMENTATION CONTROL DESIGN Erosion Control BMP’s will be provided for the project, including silt fencing, rock construction entrance, straw wattles, sediment pond and CB inlet protection. A Temporary Erosion and Sedimentation Control (TESC) Plan and Construction Stormwater Pollution Prevention (CSWPP) Plan will be provided with the final permit submittal. IX. BOND QUANTITIES, FACILITY SUMMARIES AND DECLARATION OF COVENANT Bond Quantities Worksheet will be provided with the final permit submittal. No flow control or water quality facilities are proposed. Declaration of Covenant will be provided with the final permit submittal. X OPERATIONS AND MAINTENANCE MANUAL An Operations and Maintenance Manual will be provided within Appendix B at time of final permit submittal. Page 21 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. APPENDIX A - STORMWATER CALCULATIONS WWHM calculations of runoff rates A-1 WWHM2012 PROJECT REPORT A-2 19037-Duvall 9/23/2019 5:56:35 PM Page 2 General Model Information Project Name:19037-Duvall Site Name:DUVALL AVE DENTAL Site Address:1625 DUVALL AVE NE City:RENTON Report Date:9/23/2019 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.167 Version Date:2016/11/23 Version:4.2.13 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year A-3 19037-Duvall 9/23/2019 5:56:35 PM Page 3 Landuse Basin Data Predeveloped Land Use PRE Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 0.19 Pervious Total 0.19 Impervious Land Use acre Impervious Total 0 Basin Total 0.19 Element Flows To: Surface Interflow Groundwater A-4 19037-Duvall 9/23/2019 5:56:35 PM Page 4 Mitigated Land Use DEV Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 0.06 Pervious Total 0.06 Impervious Land Use acre ROOF TOPS FLAT 0.08 SIDEWALKS FLAT 0.01 PARKING FLAT 0.04 Impervious Total 0.13 Basin Total 0.19 Element Flows To: Surface Interflow Groundwater A-5 19037-Duvall 9/23/2019 5:56:35 PM Page 5 Routing Elements Predeveloped Routing A-6 19037-Duvall 9/23/2019 5:56:35 PM Page 6 Mitigated Routing A-7 19037-Duvall 9/23/2019 5:56:35 PM Page 7 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.19 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0.06 Total Impervious Area:0.13 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.007831 5 year 0.013309 10 year 0.017666 25 year 0.024001 50 year 0.029327 100 year 0.03518 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.060697 5 year 0.076709 10 year 0.087593 25 year 0.101715 50 year 0.112527 100 year 0.123604 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.011 0.080 1950 0.012 0.083 1951 0.015 0.050 1952 0.005 0.042 1953 0.004 0.046 1954 0.006 0.050 1955 0.010 0.056 1956 0.009 0.054 1957 0.008 0.063 1958 0.007 0.050 A-8 19037-Duvall 9/23/2019 5:57:17 PM Page 8 1959 0.006 0.051 1960 0.012 0.053 1961 0.006 0.053 1962 0.004 0.045 1963 0.006 0.052 1964 0.008 0.050 1965 0.006 0.064 1966 0.005 0.043 1967 0.013 0.072 1968 0.007 0.084 1969 0.007 0.058 1970 0.006 0.057 1971 0.007 0.067 1972 0.012 0.070 1973 0.006 0.042 1974 0.007 0.062 1975 0.009 0.069 1976 0.007 0.049 1977 0.003 0.051 1978 0.006 0.064 1979 0.003 0.085 1980 0.021 0.082 1981 0.005 0.062 1982 0.012 0.088 1983 0.008 0.071 1984 0.005 0.045 1985 0.003 0.061 1986 0.012 0.053 1987 0.012 0.082 1988 0.005 0.050 1989 0.003 0.068 1990 0.036 0.115 1991 0.017 0.089 1992 0.006 0.045 1993 0.006 0.043 1994 0.002 0.043 1995 0.008 0.055 1996 0.020 0.063 1997 0.015 0.059 1998 0.006 0.057 1999 0.023 0.118 2000 0.006 0.060 2001 0.001 0.065 2002 0.008 0.076 2003 0.013 0.064 2004 0.013 0.113 2005 0.009 0.052 2006 0.008 0.047 2007 0.028 0.105 2008 0.028 0.087 2009 0.012 0.077 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0362 0.1182 2 0.0282 0.1153 3 0.0277 0.1126 A-9 19037-Duvall 9/23/2019 5:57:17 PM Page 9 4 0.0232 0.1053 5 0.0214 0.0892 6 0.0204 0.0877 7 0.0165 0.0866 8 0.0154 0.0853 9 0.0146 0.0837 10 0.0133 0.0826 11 0.0133 0.0819 12 0.0125 0.0817 13 0.0125 0.0803 14 0.0124 0.0767 15 0.0123 0.0758 16 0.0122 0.0722 17 0.0120 0.0706 18 0.0120 0.0696 19 0.0116 0.0688 20 0.0114 0.0675 21 0.0096 0.0673 22 0.0094 0.0652 23 0.0089 0.0644 24 0.0086 0.0642 25 0.0085 0.0637 26 0.0082 0.0634 27 0.0080 0.0626 28 0.0078 0.0624 29 0.0078 0.0624 30 0.0077 0.0608 31 0.0074 0.0596 32 0.0074 0.0590 33 0.0073 0.0576 34 0.0072 0.0575 35 0.0069 0.0569 36 0.0068 0.0558 37 0.0065 0.0555 38 0.0062 0.0539 39 0.0061 0.0533 40 0.0061 0.0531 41 0.0059 0.0527 42 0.0058 0.0524 43 0.0058 0.0519 44 0.0057 0.0511 45 0.0056 0.0506 46 0.0056 0.0504 47 0.0055 0.0501 48 0.0055 0.0500 49 0.0051 0.0497 50 0.0050 0.0496 51 0.0049 0.0491 52 0.0048 0.0466 53 0.0048 0.0461 54 0.0043 0.0453 55 0.0040 0.0452 56 0.0033 0.0451 57 0.0032 0.0432 58 0.0029 0.0426 59 0.0029 0.0426 60 0.0025 0.0421 61 0.0014 0.0418 A-10 19037-Duvall 9/23/2019 5:57:17 PM Page 10 A-11 19037-Duvall 9/23/2019 5:57:17 PM Page 11 Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.0039 16213 97725 602 Fail 0.0042 14117 92528 655 Fail 0.0044 12194 87694 719 Fail 0.0047 10508 83010 789 Fail 0.0049 9161 78754 859 Fail 0.0052 7965 74861 939 Fail 0.0055 6951 71096 1022 Fail 0.0057 6141 67610 1100 Fail 0.0060 5450 64273 1179 Fail 0.0062 4860 61172 1258 Fail 0.0065 4359 58178 1334 Fail 0.0067 3918 55418 1414 Fail 0.0070 3482 52830 1517 Fail 0.0073 3084 50349 1632 Fail 0.0075 2731 48018 1758 Fail 0.0078 2415 45836 1897 Fail 0.0080 2158 43740 2026 Fail 0.0083 1931 41730 2161 Fail 0.0085 1760 39826 2262 Fail 0.0088 1597 38029 2381 Fail 0.0090 1391 36318 2610 Fail 0.0093 1246 34693 2784 Fail 0.0096 1118 33153 2965 Fail 0.0098 1035 31762 3068 Fail 0.0101 944 30479 3228 Fail 0.0103 875 29132 3329 Fail 0.0106 791 27912 3528 Fail 0.0108 716 26715 3731 Fail 0.0111 633 25495 4027 Fail 0.0114 549 24447 4453 Fail 0.0116 466 23421 5025 Fail 0.0119 392 22394 5712 Fail 0.0121 351 21432 6105 Fail 0.0124 310 20565 6633 Fail 0.0126 265 19787 7466 Fail 0.0129 220 19021 8645 Fail 0.0132 184 18243 9914 Fail 0.0134 152 17492 11507 Fail 0.0137 127 16799 13227 Fail 0.0139 113 16106 14253 Fail 0.0142 94 15496 16485 Fail 0.0144 80 14904 18630 Fail 0.0147 67 14322 21376 Fail 0.0150 60 13759 22931 Fail 0.0152 49 13291 27124 Fail 0.0155 44 12793 29075 Fail 0.0157 41 12294 29985 Fail 0.0160 35 11862 33891 Fail 0.0162 31 11409 36803 Fail 0.0165 25 10938 43752 Fail 0.0167 20 10525 52625 Fail 0.0170 18 10145 56361 Fail 0.0173 12 9777 81475 Fail 0.0175 12 9456 78800 Fail A-12 19037-Duvall 9/23/2019 5:57:17 PM Page 12 0.0178 11 9103 82754 Fail 0.0180 11 8804 80036 Fail 0.0183 10 8496 84960 Fail 0.0185 9 8173 90811 Fail 0.0188 9 7888 87644 Fail 0.0191 9 7582 84244 Fail 0.0193 9 7259 80655 Fail 0.0196 9 7020 78000 Fail 0.0198 9 6797 75522 Fail 0.0201 9 6541 72677 Fail 0.0203 9 6316 70177 Fail 0.0206 8 6074 75925 Fail 0.0209 8 5865 73312 Fail 0.0211 8 5674 70925 Fail 0.0214 7 5501 78585 Fail 0.0216 6 5326 88766 Fail 0.0219 6 5155 85916 Fail 0.0221 6 4986 83100 Fail 0.0224 6 4817 80283 Fail 0.0227 6 4639 77316 Fail 0.0229 6 4504 75066 Fail 0.0232 6 4353 72550 Fail 0.0234 5 4186 83720 Fail 0.0237 5 4036 80720 Fail 0.0239 5 3923 78460 Fail 0.0242 5 3803 76060 Fail 0.0245 5 3670 73400 Fail 0.0247 5 3544 70880 Fail 0.0250 5 3431 68620 Fail 0.0252 5 3322 66440 Fail 0.0255 4 3236 80900 Fail 0.0257 4 3136 78400 Fail 0.0260 4 3033 75825 Fail 0.0262 4 2926 73150 Fail 0.0265 4 2828 70700 Fail 0.0268 4 2744 68600 Fail 0.0270 4 2656 66400 Fail 0.0273 4 2565 64125 Fail 0.0275 4 2494 62350 Fail 0.0278 3 2432 81066 Fail 0.0280 3 2366 78866 Fail 0.0283 1 2306 230600 Fail 0.0286 1 2244 224400 Fail 0.0288 1 2171 217100 Fail 0.0291 1 2112 211200 Fail 0.0293 1 2047 204700 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. A-13 19037-Duvall 9/23/2019 5:57:17 PM Page 13 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. A-14 19037-Duvall 9/23/2019 5:57:17 PM Page 14 LID Report A-15 19037-Duvall 9/23/2019 5:58:08 PM Page 15 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. A-16 19037-Duvall 9/23/2019 5:58:08 PM Page 16 Appendix Predeveloped Schematic A-17 19037-Duvall 9/23/2019 5:58:09 PM Page 17 Mitigated Schematic A-18 19037-Duvall 9/23/2019 5:58:09 PM Page 18 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 19037-Duvall.wdm MESSU 25 Pre19037-Duvall.MES 27 Pre19037-Duvall.L61 28 Pre19037-Duvall.L62 30 POC19037-Duvall1.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 PRE 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 A-19 19037-Duvall 9/23/2019 5:58:09 PM Page 19 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 A-20 19037-Duvall 9/23/2019 5:58:09 PM Page 20 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** PRE*** PERLND 11 0.19 COPY 501 12 PERLND 11 0.19 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC A-21 19037-Duvall 9/23/2019 5:58:09 PM Page 21 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN A-22 19037-Duvall 9/23/2019 5:58:09 PM Page 22 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 19037-Duvall.wdm MESSU 25 Mit19037-Duvall.MES 27 Mit19037-Duvall.L61 28 Mit19037-Duvall.L62 30 POC19037-Duvall1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 IMPLND 4 IMPLND 8 IMPLND 11 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 DEV 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 ********* A-23 19037-Duvall 9/23/2019 5:58:09 PM Page 23 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 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 *** 4 ROOF TOPS/FLAT 1 1 1 27 0 8 SIDEWALKS/FLAT 1 1 1 27 0 11 PARKING/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 8 0 0 1 0 0 0 11 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 8 0 0 4 0 0 0 1 9 11 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 8 0 0 0 0 0 11 0 0 0 0 0 END IWAT-PARM1 A-24 19037-Duvall 9/23/2019 5:58:09 PM Page 24 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 4 400 0.01 0.1 0.1 8 400 0.01 0.1 0.1 11 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 4 0 0 8 0 0 11 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 4 0 0 8 0 0 11 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** DEV*** PERLND 11 0.06 COPY 501 12 PERLND 11 0.06 COPY 501 13 IMPLND 4 0.08 COPY 501 15 IMPLND 8 0.01 COPY 501 15 IMPLND 11 0.04 COPY 501 15 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** A-25 19037-Duvall 9/23/2019 5:58:09 PM Page 25 # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1.167 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1.167 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 END MASS-LINK END RUN A-26 19037-Duvall 9/23/2019 5:58:09 PM Page 26 Predeveloped HSPF Message File A-27 19037-Duvall 9/23/2019 5:58:09 PM Page 27 Mitigated HSPF Message File A-28 19037-Duvall 9/23/2019 5:58:09 PM Page 28 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2019; 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 A-29 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. APPENDIX B - STORMWATER OPERATION & MAINTENANCE MANUAL To be provided with the final permit submittal. DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. APPENDIX C - GEOTECHNICAL REPORT C-1 C-2 C-3 C-4 C-5 C-6 C-7 C-8 C-9 C-10 C-11 C-12 C-13 C-14 C-15 C-16 C-17 C-18 C-19 C-20 C-21 C-22 C-23 C-24 C-25 C-26 C-27