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HomeMy WebLinkAboutEX_08_RS_Drainage_Report_221025_v2T 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 25, 2022 PREPARED FOR: Duvall & 17th LLC PREPARED BY: Terraforma Design Group, Inc. 5027 51st Avenue SW Seattle, WA 98136 TDG No. 19037 107/2019 EXHIBIT 8 RECEIVED 11/02/2022 JDing PLANNING DIVISION 10/25/2022 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 CITY OF RENTON SURFACE WATER DESIGN MANUAL 2022 City of Renton Surface Water Design Manual 6/22/2022 8-A-1 REFERENCE 8-A TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT LOCATION AND DESCRIPTION Project Owner _____________________________ Phone ___________________________________ Address __________________________________ _________________________________________ Project Engineer ___________________________ Company _________________________________ Phone ___________________________________ Project Name __________________________ CED Permit # ________________________ Location Township ________________ Range __________________ Section _________________ Site Address __________________________ _____________________________________ Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS  Land Use (e.g., Subdivision / Short Subd.)  Building (e.g., M/F / Commercial / SFR)  Grading  Right-of-Way Use  Other _______________________  DFW HPA  COE 404  DOE Dam Safety  FEMA Floodplain  COE Wetlands  Other ________  Shoreline Management  Structural Rockery/Vault/_____  ESA Section 7 Part 5 PLAN AND REPORT INFORMATION Technical Information Report Site Improvement Plan (Engr. Plans) Type of Drainage Review (check one): Date (include revision dates): Date of Final:  Full  Targeted  Simplified  Large Project  Directed __________________ __________________ __________________ Plan Type (check one): Date (include revision dates): Date of Final:  Full  Modified  Simplified __________________ __________________ __________________ Page 1 3 (SW1/4) 5E 23N 10/25/22 10/25/22 Renton, 98059 1625 Duvall Avenue NE Duvall Ave NE Office Building (206) 923-0590 Terraforma Design Group, Inc. Pedro DeGuzman, PE Seattle, WA 98111 PO Box 12883 (206) 323-5544 Duvall & 17th LLC DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 6/22/2022 2022 City of Renton Surface Water Design Manual 8-A-2 Part 6 SWDM ADJUSTMENT APPROVALS Type (circle one): Standard / Blanket Description: (include conditions in TIR Section 2) ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Approved Adjustment No. ______________________ Date of Approval: _______________________ Part 7 MONITORING REQUIREMENTS Monitoring Required: Yes / No Start Date: _______________________ Completion Date: _______________________ Describe: _________________________________ _________________________________________ _________________________________________ Re: SWDM Adjustment No. ________________ Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan: ____________________________________________________________________ Special District Overlays: ______________________________________________________________ Drainage Basin: _____________________________________________________________________ Stormwater Requirements: _____________________________________________________________ Part 9 ONSITE AND ADJACENT SENSITIVE AREAS  River/Stream ________________________  Lake ______________________________  Wetlands ____________________________  Closed Depression ____________________  Floodplain ___________________________  Other _______________________________ _______________________________  Steep Slope __________________________  Erosion Hazard _______________________  Landslide Hazard ______________________  Coal Mine Hazard ______________________  Seismic Hazard _______________________  Habitat Protection ______________________  _____________________________________ Page 2 Flow Control Duration Standard (Forested Condition) Honey Creek Drainage Basin N/A DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2022 City of Renton Surface Water Design Manual 6/22/2022 Ref 8-A-3 Part 10 SOILS Soil Type ______________________ ______________________ ______________________ ______________________ Slopes ________________________ ________________________ ________________________ ________________________ Erosion Potential _________________________ _________________________ _________________________ _________________________  High Groundwater Table (within 5 feet)  Other ________________________________  Sole Source Aquifer  Seeps/Springs  Additional Sheets Attached Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE  Core 2 – Offsite Analysis_________________  Sensitive/Critical Areas__________________  SEPA________________________________  LID Infeasibility________________________  Other________________________________  _____________________________________ LIMITATION / SITE CONSTRAINT _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________  Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: (name or description) Core Requirements (all 9 apply): Discharge at Natural Location Number of Natural Discharge Locations: Offsite Analysis Level: 1 / 2 / 3 dated:__________________ Flow Control (include facility summary sheet) Standard: _______________________________ or Exemption Number: ____________ Conveyance System Spill containment located at: _____________________________ Erosion and Sediment Control / Construction Stormwater Pollution Prevention CSWPP/CESCL/ESC Site Supervisor: _____________________ Contact Phone: _________________________ After Hours Phone: _________________________ Maintenance and Operation Responsibility (circle one): Private / Public If Private, Maintenance Log Required: Yes / No Financial Guarantees and Liability Provided: Yes / No Page 3 * To be provided with final permit #2 (<0.15 cfs increase) * Not Determined Yet CB #2 none Flow Control Duration (Forested) 10/25/2022 1 ONSITE minimal site setbacks, ex. soils have low infiltration rate lowmoderateVashon Lodgement Till DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 6/22/2022 2022 City of Renton Surface Water Design Manual 8-A-4 Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Water Quality (include facility summary sheet) Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog or Exemption No. _______________________ On-site BMPs Describe: Special Requirements (as applicable): Area Specific Drainage Requirements Type: SDO / MDP / BP / Shared Fac. / None Name: ________________________ Floodplain/Floodway Delineation Type (circle one): Major / Minor / Exemption / None 100-year Base Flood Elevation (or range): _______________ Datum: Flood Protection Facilities Describe: Source Control (commercial / industrial land use) Describe land use: Describe any structural controls: Oil Control High-Use Site: Yes / No Treatment BMP: _________________________________ Maintenance Agreement: Yes / No with whom? _____________________________________ Other Drainage Structures Describe: Page 4 N/A Permeable concrete walkways N/A N/A N/A N/A #1 (<5000 sf PGIS) DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2022 City of Renton Surface Water Design Manual 6/22/2022 Ref 8-A-5 Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION  Clearing Limits  Cover Measures  Perimeter Protection  Traffic Area Stabilization  Sediment Retention  Surface Water Collection  Dewatering Control  Dust Control  Flow Control  Control Pollutants  Protect Existing and Proposed BMPs/Facilities  Maintain Protective BMPs / Manage Project MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION  Stabilize exposed surfaces  Remove and restore Temporary ESC Facilities  Clean and remove all silt and debris, ensure operation of Permanent BMPs/Facilities, restore operation of BMPs/Facilities as necessary  Flag limits of sensitive areas and open space preservation areas  Other _______________________ Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Description Water Quality Description On-site BMPs Description  Detention  Infiltration  Regional Facility  Shared Facility  Other _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________  Vegetated Flowpath  Wetpool  Filtration  Oil Control  Spill Control  Other _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________  Full Dispersion  Full Infiltration  Limited Infiltration  Rain Gardens  Bioretention  Permeable Pavement  Basic Dispersion  Soil Amendment  Perforated Pipe Connection  Other _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ _____________ Page 5 permeable walkway * None Proposed* None Proposed DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 6/22/2022 2022 City of Renton Surface Water Design Manual 8-A-6 Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS  Drainage Easement  Covenant  Native Growth Protection Covenant  Tract  Other ____________________________  Cast in Place Vault  Retaining Wall  Rockery > 4′ High  Structural on Steep Slope  Other _______________________________ Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attached Technical Information Report. To the best of my knowledge the information provided here is accurate. ____________________________________________________________________________________ Signed/Date Page 6 10/25/22 N/AN/A DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 2022 City of Renton Surface Water Design Manual and were submitted as part of our land use application with th e 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= 2691 sf Onsite New & Replaced Impervious Area= 5511 sf Onsite Pollution Generating Impervious Area= 1700 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. I. Page 7 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. Page 8 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. AERIAL – EXISTING CONDITIONS Page 9 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 80.00'S1°53'35"WR=25.00' A=40.61' D=93°03'57"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 PAVINGPAVINGPAVING R/W R/WNEW WALKNEW WALK PLANTERPLANTERPLAN T E R NE 17TH STREET DUVALL AVE NEP/LP/LWALKNEW WALK PLANTER PLANTER PLANTERPLANTERUP PLANT E R WALK ROOF ROOF PAVING ONSITE BASIN DATA - DEVELOPED Agrass = 3979 sf Aroof =3763 sf Awalk =1820 sf Apaving =1700 sf Atotal =11,262 sf Pollution Generating Impervious Surface = 1700 sf DUVALL AVE NE OFFICE BLDG DRAINAGE BASIN MAP Page 11 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. Page 12 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 2022 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 5511 sf of impervious surface. Predeveloped and Developed Discharge Rates using the Western Washington Hydrology Model Existing 100-yr Discharge Rate (Forested) = 0.080 cfs Proposed 100-yr Discharge Rate = 0.194 cfs Net Increase = 0.114 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 17 th Street and Duvall Avenue NE to construct sidewalks and widen the roadway in NE 17 th 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 17 th 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 2022 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 Page 19 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 1 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 AvePage 20DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 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 after the initial plan review. Page 21 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. APPENDIX A - STORMWATER CALCULATIONS WWHM calculations of runoff rates A-1 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 WWHM2012 PROJECT REPORT A-2 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:10:41 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:4/5/2022 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.167 Version Date:2019/09/13 Version:4.2.17 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year A-3 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:10:41 PM Page 3 Landuse Basin Data Predeveloped Land Use PRE Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 0.17 C, Lawn, Flat 0.09 Pervious Total 0.26 Impervious Land Use acre Impervious Total 0 Basin Total 0.26 Element Flows To: Surface Interflow Groundwater A-4 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:10:41 PM Page 4 Mitigated Land Use DEV Bypass:No GroundWater:No Pervious Land Use acre C, Lawn, Flat 0.09 Pervious Total 0.09 Impervious Land Use acre ROOF TOPS FLAT 0.09 SIDEWALKS FLAT 0.04 PARKING FLAT 0.04 Impervious Total 0.17 Basin Total 0.26 Element Flows To: Surface Interflow Groundwater A-5 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:10:41 PM Page 5 Routing Elements Predeveloped Routing A-6 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:10:41 PM Page 6 Mitigated Routing A-7 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:10:41 PM Page 7 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.26 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0.09 Total Impervious Area:0.17 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.017589 5 year 0.030013 10 year 0.039921 25 year 0.05436 50 year 0.066524 100 year 0.079908 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.087585 5 year 0.113857 10 year 0.132106 25 year 0.156193 50 year 0.174912 100 year 0.194315 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.032 0.122 1950 0.033 0.115 1951 0.023 0.075 1952 0.009 0.056 1953 0.007 0.063 1954 0.014 0.072 1955 0.016 0.080 1956 0.018 0.077 1957 0.022 0.093 1958 0.011 0.070 A-8 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:20 PM Page 8 1959 0.010 0.067 1960 0.023 0.077 1961 0.016 0.078 1962 0.006 0.062 1963 0.016 0.078 1964 0.016 0.070 1965 0.020 0.096 1966 0.010 0.061 1967 0.033 0.108 1968 0.018 0.123 1969 0.018 0.089 1970 0.016 0.083 1971 0.021 0.098 1972 0.031 0.111 1973 0.008 0.055 1974 0.019 0.093 1975 0.023 0.094 1976 0.015 0.071 1977 0.013 0.073 1978 0.013 0.087 1979 0.005 0.117 1980 0.044 0.124 1981 0.014 0.091 1982 0.037 0.135 1983 0.016 0.100 1984 0.011 0.065 1985 0.011 0.090 1986 0.021 0.075 1987 0.021 0.116 1988 0.008 0.065 1989 0.006 0.088 1990 0.078 0.181 1991 0.047 0.142 1992 0.014 0.065 1993 0.009 0.057 1994 0.005 0.056 1995 0.013 0.078 1996 0.038 0.093 1997 0.024 0.087 1998 0.015 0.081 1999 0.054 0.185 2000 0.017 0.088 2001 0.006 0.091 2002 0.028 0.118 2003 0.029 0.096 2004 0.036 0.171 2005 0.019 0.076 2006 0.019 0.069 2007 0.067 0.163 2008 0.048 0.139 2009 0.028 0.103 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0779 0.1848 2 0.0671 0.1814 3 0.0543 0.1712 A-9 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:20 PM Page 9 4 0.0482 0.1634 5 0.0468 0.1419 6 0.0439 0.1386 7 0.0380 0.1346 8 0.0370 0.1238 9 0.0355 0.1234 10 0.0334 0.1219 11 0.0328 0.1180 12 0.0319 0.1168 13 0.0306 0.1160 14 0.0289 0.1155 15 0.0277 0.1108 16 0.0276 0.1082 17 0.0236 0.1028 18 0.0235 0.0998 19 0.0232 0.0976 20 0.0226 0.0961 21 0.0215 0.0955 22 0.0211 0.0937 23 0.0208 0.0933 24 0.0206 0.0928 25 0.0199 0.0926 26 0.0192 0.0912 27 0.0189 0.0909 28 0.0188 0.0902 29 0.0184 0.0894 30 0.0182 0.0884 31 0.0181 0.0881 32 0.0166 0.0875 33 0.0163 0.0875 34 0.0162 0.0827 35 0.0158 0.0812 36 0.0156 0.0804 37 0.0156 0.0781 38 0.0156 0.0778 39 0.0154 0.0777 40 0.0151 0.0772 41 0.0145 0.0772 42 0.0137 0.0762 43 0.0135 0.0750 44 0.0134 0.0748 45 0.0132 0.0730 46 0.0128 0.0723 47 0.0115 0.0706 48 0.0113 0.0702 49 0.0105 0.0701 50 0.0104 0.0693 51 0.0098 0.0674 52 0.0094 0.0654 53 0.0090 0.0651 54 0.0084 0.0649 55 0.0076 0.0626 56 0.0067 0.0623 57 0.0061 0.0606 58 0.0060 0.0574 59 0.0059 0.0565 60 0.0052 0.0563 61 0.0052 0.0552 A-10 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:20 PM Page 10 A-11 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:20 PM Page 11 Duration Flows Flow(cfs)Predev Mit Percentage Pass/Fail 0.0088 5955 59418 997 Fail 0.0094 4990 54670 1095 Fail 0.0100 4246 50435 1187 Fail 0.0105 3548 46499 1310 Fail 0.0111 2994 42970 1435 Fail 0.0117 2496 39591 1586 Fail 0.0123 2162 36618 1693 Fail 0.0129 1849 33944 1835 Fail 0.0135 1584 31484 1987 Fail 0.0140 1322 29174 2206 Fail 0.0146 1177 27014 2295 Fail 0.0152 1030 25132 2440 Fail 0.0158 903 23335 2584 Fail 0.0164 755 21688 2872 Fail 0.0170 613 20268 3306 Fail 0.0175 503 18880 3753 Fail 0.0181 418 17573 4204 Fail 0.0187 335 16435 4905 Fail 0.0193 280 15308 5467 Fail 0.0199 238 14352 6030 Fail 0.0205 210 13430 6395 Fail 0.0210 178 12604 7080 Fail 0.0216 154 11824 7677 Fail 0.0222 134 11028 8229 Fail 0.0228 121 10356 8558 Fail 0.0234 105 9708 9245 Fail 0.0240 92 9180 9978 Fail 0.0245 84 8641 10286 Fail 0.0251 81 8113 10016 Fail 0.0257 75 7582 10109 Fail 0.0263 74 7150 9662 Fail 0.0269 69 6703 9714 Fail 0.0275 63 6323 10036 Fail 0.0280 57 5980 10491 Fail 0.0286 54 5634 10433 Fail 0.0292 52 5307 10205 Fail 0.0298 48 5020 10458 Fail 0.0304 45 4744 10542 Fail 0.0310 40 4468 11170 Fail 0.0315 37 4235 11445 Fail 0.0321 33 3995 12106 Fail 0.0327 31 3771 12164 Fail 0.0333 26 3580 13769 Fail 0.0339 25 3397 13588 Fail 0.0345 24 3225 13437 Fail 0.0350 22 3061 13913 Fail 0.0356 20 2905 14525 Fail 0.0362 19 2753 14489 Fail 0.0368 19 2612 13747 Fail 0.0374 16 2483 15518 Fail 0.0380 16 2385 14906 Fail 0.0385 15 2280 15200 Fail 0.0391 14 2171 15507 Fail 0.0397 14 2073 14807 Fail A-12 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:20 PM Page 12 0.0403 13 1957 15053 Fail 0.0409 12 1844 15366 Fail 0.0414 12 1754 14616 Fail 0.0420 12 1692 14100 Fail 0.0426 12 1624 13533 Fail 0.0432 12 1548 12900 Fail 0.0438 11 1480 13454 Fail 0.0444 10 1414 14139 Fail 0.0449 9 1358 15088 Fail 0.0455 8 1289 16112 Fail 0.0461 8 1229 15362 Fail 0.0467 7 1178 16828 Fail 0.0473 6 1119 18650 Fail 0.0479 6 1067 17783 Fail 0.0484 5 1031 20620 Fail 0.0490 5 989 19780 Fail 0.0496 5 953 19060 Fail 0.0502 5 916 18320 Fail 0.0508 5 874 17480 Fail 0.0514 5 842 16840 Fail 0.0519 5 808 16160 Fail 0.0525 5 783 15660 Fail 0.0531 5 757 15139 Fail 0.0537 4 729 18225 Fail 0.0543 4 693 17325 Fail 0.0549 3 667 22233 Fail 0.0554 3 643 21433 Fail 0.0560 2 617 30850 Fail 0.0566 2 590 29500 Fail 0.0572 2 573 28650 Fail 0.0578 2 555 27750 Fail 0.0584 2 537 26850 Fail 0.0589 2 514 25700 Fail 0.0595 2 502 25100 Fail 0.0601 2 484 24200 Fail 0.0607 2 467 23350 Fail 0.0613 2 452 22600 Fail 0.0619 2 441 22050 Fail 0.0624 2 417 20850 Fail 0.0630 2 401 20050 Fail 0.0636 2 394 19700 Fail 0.0642 2 387 19350 Fail 0.0648 2 378 18900 Fail 0.0654 2 366 18300 Fail 0.0659 2 357 17850 Fail 0.0665 2 346 17300 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:20 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:20 PM Page 14 LID Report A-15 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:32 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:32 PM Page 16 Appendix Predeveloped Schematic A-17 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:32 PM Page 17 Mitigated Schematic A-18 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 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 PERLND 16 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 16 C, Lawn, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 11 0 0 1 0 0 0 0 0 0 0 0 0 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* A-19 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 PM Page 19 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 11 0 4.5 0.08 400 0.1 0.5 0.996 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 11 0 0 0 0 2.5 1 0 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 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 A-20 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 PM Page 20 <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 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** PRE*** PERLND 11 0.17 COPY 501 12 PERLND 11 0.17 COPY 501 13 PERLND 16 0.09 COPY 501 12 PERLND 16 0.09 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 A-21 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 PM Page 21 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 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 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 16 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 *** 16 C, Lawn, Flat 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 16 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* A-23 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 PM Page 23 16 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 16 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 16 0 4.5 0.03 400 0.05 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 16 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 16 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 16 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 4 ROOF TOPS/FLAT 1 1 1 27 0 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 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 16 0.09 COPY 501 12 PERLND 16 0.09 COPY 501 13 IMPLND 4 0.09 COPY 501 15 IMPLND 8 0.04 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 PM Page 26 Predeveloped HSPF Message File A-27 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 PM Page 27 Mitigated HSPF Message File A-28 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 19037-Duvall 4/5/2022 12:11:33 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. 2005-2022; 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 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. APPENDIX B - STORMWATER OPERATION & MAINTENANCE MANUAL To be provided after the initial plan review. DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 DUVALL AVE NE OFFICE BUILDING TECHNICAL INFORMATION REPORT Terraforma Design Group, Inc. APPENDIX C - GEOTECHNICAL REPORT C-1 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-2 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-3 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-4 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-5 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-6 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-7 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-8 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-9 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-10 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-11 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-12 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-13 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-14 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-15 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-16 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-17 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-18 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-19 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-20 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-21 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-22 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-23 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-24 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-25 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-26 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02 C-27 DocuSign Envelope ID: 1169B1FC-4E5A-4A85-B963-8EA37D86CF02