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Home My WebLink AboutRS_TIR_2018.pdf STORMWATER CONTROL PLAN Chick-fil-A Project Site No. 04249 361 Rainier Avenue South Renton, Washington Prepared for: Chick-fil-A, Inc. 15635 Alton Parkway, Suite 350 Irvine, CA 92618 August 16, 2018 Our Job No. 18963 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX BRANCH OFFICES ¨ TUMWATER, WA ¨ KLAMATH FALLS, OR ¨ LONG BEACH, CA ¨ ROSEVILLE, CA ¨ SAN DIEGO, CA www.barghausen.com Stormwater Control Plan Chick-fil-A Project Site No. 04249 Renton, Washington Our Job No. 18963 18963.001.doc TABLE OF CONTENTS 1.0 PROJECT OVERVIEW 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 3.0 OFF-SITE ANALYSIS 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN 6.0 SPECIAL REPORTS AND STUDIES 7.0 OTHER PERMITS 8.0 CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN (CSWPPP) ANALYSIS AND DESIGN 9.0 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 10.0 OPERATIONS AND MAINTENANCE MANUAL Tab 1.0 18963.001.doc 1.0 PROJECT OVERVIEW The existing site is a partially developed 0.93-acre lot located in the northwest quarter of the southeast quarter of Section 18, Township 23 North, Range 5 East, Willamette Meridian, City of Renton, King County, Washington. Specifically, the site is at 361 Rainier Avenue South, Parcel No. 000720-0209. See Figure 1.2, Vicinity Map, for a graphical depiction of the exact site location. The existing site has a restaurant building that sits at the northeast corner of the site. There is a former building pad on the south half of the site that is currently a grass covered area. Surrounding the existing building and grass pad is a paved parking area. There is storm sewer on site that collects and conveys stormwater off site to the storm sewer in the right-of-way of Rainier Avenue. See Figure 1.6 for the Existing Conditions Map. The proposed Chick-fil-A quick serve restaurant project proposes a 4,195-square-foot building and associated utilities with new on-site curb, sidewalk, and asphalt pavement for parking and maneuvering and drive-thru facilities. A stormwater system is proposed that will collect, convey, and detain stormwater on site. See Figure 1.7 for the Proposed Site Map. Permits associated with this project include: · Grading Permit · Building Permit · Health Department Permit · Utility Permits for Water, Sewer and Storm · Fire Permit · Mechanical and Plumbing Permits The proposed improvements will require the site to implement formal flow control and water quality treatment per the 2017 Renton Surface Water Design Manual. A Full Drainage Review is required. See Figure 1.5 (Figure 1.1.2.A Flow Chart For Determining Type of Drainage Review Required). This is discussed further in Section 4.0 of this report. A Geotechnical Report has been provided for the project site by Terracon and is provided in Section 6.0 of this report. Full infiltration is not recommended on site due to high groundwater elevation during the winter months. This is discussed further in Section 4.0 of this report. CITY OF RENTON SURFACE WATER DESIGN MANUAL 2017 City of Renton Surface Water Design Manual 12/12/2016 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 __________________ __________________ __________________ REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 12/12/2016 2017 City of Renton Surface Water Design Manual 8-A-2 Part 6 SWDM ADJUSTMENT APPROVALS Type (circle one): Standard / Blanket Description: (include conditions in TIR Section 2) ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Approved Adjustment No. ______________________ Date of Approval: _______________________ Part 7 MONITORING REQUIREMENTS Monitoring Required: Yes / No Start Date: _______________________ Completion Date: _______________________ Describe: _________________________________ _________________________________________ _________________________________________ Re: SWDM Adjustment No. ________________ Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan: ____________________________________________________________________ Special District Overlays: ______________________________________________________________ Drainage Basin: _____________________________________________________________________ Stormwater Requirements: _____________________________________________________________ Part 9 ONSITE AND ADJACENT SENSITIVE AREAS  River/Stream ________________________  Lake ______________________________  Wetlands ____________________________  Closed Depression ____________________  Floodplain ___________________________  Other _______________________________ _______________________________  Steep Slope __________________________  Erosion Hazard _______________________  Landslide Hazard ______________________  Coal Mine Hazard ______________________  Seismic Hazard _______________________  Habitat Protection ______________________  _____________________________________ REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2017 City of Renton Surface Water Design Manual 12/12/2016 Ref 8-A-3 Part 10 SOILS Soil Type ______________________ ______________________ ______________________ ______________________ Slopes ________________________ ________________________ ________________________ ________________________ Erosion Potential _________________________ _________________________ _________________________ _________________________  High Groundwater Table (within 5 feet)  Other ________________________________  Sole Source Aquifer  Seeps/Springs  Additional Sheets Attached Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE  Core 2 – Offsite Analysis_________________  Sensitive/Critical Areas__________________  SEPA________________________________  LID Infeasibility________________________  Other________________________________  _____________________________________ LIMITATION / SITE CONSTRAINT _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________ _______________________________________  Additional Sheets Attached Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: (name or description) Core Requirements (all 8 apply): Discharge at Natural Location Number of Natural Discharge Locations: Offsite Analysis Level: 1 / 2 / 3 dated:__________________ Flow Control (include facility summary sheet) Standard: _______________________________ or Exemption Number: ____________ On-site BMPs: _______________________________ Conveyance System Spill containment located at: _____________________________ Erosion and Sediment Control / Construction Stormwater Pollution Prevention CSWPP/CESCL/ESC Site Supervisor: _____________________ Contact Phone: _________________________ After Hours Phone: _________________________ REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 12/12/2016 2017 City of Renton Surface Water Design Manual 8-A-4 Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Maintenance and Operation Responsibility (circle one): Private / Public If Private, Maintenance Log Required: Yes / No Financial Guarantees and Liability Provided: Yes / No Water Quality (include facility summary sheet) Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog or Exemption No. _______________________ Special Requirements (as applicable): Area Specific Drainage Requirements Type: SDO / MDP / BP / Shared Fac. / None Name: ________________________ Floodplain/Floodway Delineation Type (circle one): Major / Minor / Exemption / None 100-year Base Flood Elevation (or range): _______________ Datum: Flood Protection Facilities Describe: Source Control (commercial / industrial land use) Describe land use: Describe any structural controls: Oil Control High-Use Site: Yes / No Treatment BMP: _________________________________ Maintenance Agreement: Yes / No with whom? _____________________________________ Other Drainage Structures Describe: REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 2017 City of Renton Surface Water Design Manual 12/12/2016 Ref 8-A-5 Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION  Clearing Limits  Cover Measures  Perimeter Protection  Traffic Area Stabilization  Sediment Retention  Surface Water Collection  Dewatering Control  Dust Control  Flow Control  Control Pollutants  Protect Existing and Proposed BMPs/Facilities  Maintain Protective BMPs / Manage Project MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION  Stabilize exposed surfaces  Remove and restore Temporary ESC Facilities  Clean and remove all silt and debris, ensure operation of Permanent BMPs/Facilities, restore operation of BMPs/Facilities as necessary  Flag limits of sensitive areas and open space preservation areas  Other _______________________ Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Type/Description Water Quality Type/Description  Detention  Infiltration  Regional Facility  Shared Facility  On-site BMPs  Other ________________ ________________ ________________ ________________ ________________ ________________  Vegetated Flowpath  Wetpool  Filtration  Oil Control  Spill Control  On-site BMPs  Other ________________ ________________ ________________ ________________ ________________ ________________ ________________ Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS  Drainage Easement  Covenant  Native Growth Protection Covenant  Tract  Other ____________________________  Cast in Place Vault  Retaining Wall  Rockery > 4′ High  Structural on Steep Slope  Other _______________________________ REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET TECHNICAL INFORMATION REPORT (TIR) WORKSHEET 12/12/2016 2017 City of Renton Surface Water Design Manual 8-A-6 Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attached Technical Information Report. To the best of my knowledge the information provided here is accurate. ____________________________________________________________________________________ Signed/Date auhgs ernabC.OCNNIS ,USL RTIENEGN IEGN Horizontal: Scale: Vertical: For: Title: VICINITY MAP Job Number 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES N.T.S.N/A 18963 DATE: 08/15/18 Chick-fil-A Renton, Washington P:\18000s\18963\exhibit\graphics\18963 vmap.cdr REFERENCE: Rand McNally (2018) SITE auhgs ernabC.OCNNIS ,USL RTIENEGN IEGN Horizontal: Scale: Vertical: For: Title: SOIL SURVEY MAP Job Number 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES 1 : 24000 N/A 18963 DATE: 08/15/18 Chick-fil-A Renton, Washington P:\18000s\18963\exhibit\graphics\18963 topo.cdr REFERENCE: usgs.gov SITE auhgs ernabC.OCNNIS ,USL RTIENEGN IEGN Horizontal: Scale: Vertical: For: Title: SOIL SURVEY MAP Job Number 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES N.T.S.N/A 18963 DATE: 08/15/18 Chick-fil-A Renton, Washington P:\18000s\18963\exhibit\graphics\18963 soil.cdr REFERENCE: USDA, Natural Resources Conservation Service LEGEND: Ur = Urban land SITE SECTION 1.1 DRAINAGE REVIEW 12/12/2016 2017 City of Renton Surface Water Design Manual 1-14 FIGURE 1.1.2.A FLOW CHART FOR DETERMINING TYPE OF DRAINAGE REVIEW REQUIRED Tab 2.0 18963.001zj.doc 2.0 CONDITIONS AND REQUIREMENTS SUMMARY Core Requirement #1: Discharge at the Natural Location: Response: The on-site stormwater conveyance in its existing condition is connected to the abutting City storm sewer. Because of the urbanized nature of the surrounding area of the site, underground storm conveyance is the only outlet for stormwater generated on the subject site. Core Requirement #2: Offsite Analysis: Response: A Level 1 Off-Site Analysis is provided in Section 3.0 of this report that assesses potential off-site drainage and water quality impacts associated with the development of the project site. Core Requirement #3: Flow Control Facilities: Response: The subject site lies within a Peak Rate Flow Control Standard area. This means that the site stormwater discharge will match the existing discharge. The proposed redeveloped site will have approximately a 7% increase in impervious area. Once BMPs are implemented, as outlined in the discussion of Core Requirement #9 and modeled against the existing condition in WWHM, flows will pass the required parameters of the stormwater model. Per Section 1.2.3.1.A of the 2017 Renton SWDM, an increase of up to 0.15 cfs in flow for the 100-year peak flow from the site will be allowed. Core Requirement #4: Conveyance System: Response: A pipe conveyance network has been proposed for on-site stormwater collection and will be designed to convey a minimum 25-year peak flow. Core Requirement #5: Construction Stormwater Pollution Prevention (SWPPS): Response: A Construction Stormwater Pollution Prevention Plan can be found in Section 8.0 of this report. Core Requirement #6: Maintenance and Operations: Response: An Operations and Maintenance Manual will be provided to the owner of the property and can be found is Section 10.0 of this report. Core Requirement #7: Financial Guarantees and Liability: Response: The Construction Bond will be calculated and provided by the contractor once selected to perform the proposed site improvements. Core Requirement #8: Water Quality Facilities: Response: The proposed project will be a high-use site and will meet the requirements of the high-use water quality menu. Water quality will be provided, including oil control and Enhanced Basic Water Quality using a coalescing plate oil/water separator in series with a Modular Wetland Proprietary facility. Core Requirement #9: On-Site BMPs: Response: The building roof and plaza frontage along Renton Center Way S.W. will be conveyed to a 390± square-foot bioretention pond with an underdrain. The tributary area to the 18963.001zj.doc bio-retention facility will be approximately 14% of the subject site and off-site improvements. Special Requirement #1: Other Adopted Area-Specific Requirements: Response: There are no additional Area-Specific Requirements. Special Requirement #2: Flood Hazard Area Delineation: Response: The site lies outside the 500-year floodplain per FEMA FIRM Map Panel 977 of 1725, Map number 53033C0977F, Revised May 16, 1995. Special Requirement #3: Flood Protection Facilities: Response: The subject site does not rely on any Flood Protection Facilities. Special Requirement #4: Source Control: Response: The proposed developed site will implement roof covering over the trash enclosure. Special Requirement #5: Oil Control: Response: The proposed developed site will be of the high-use designation. Oil Control will be required. Special Requirement #6: Aquifer Protection Area: Response: The site does not fall within an Aquifer Protection Area Zone as depicted by the City of Renton Groundwater Protection Areas Map (Reference 15-B of the City of Renton Surface Water Design Manual). Tab 3.0 18963.001.doc 3.0 OFF-SITE ANALYSIS Due to the built up urban environment around the site, the adjacent lots around the subject site are all established with building, paving and landscaping. They have stormwater infrastructure in place. There is no off-site stormwater expected to enter the proposed site. A Level 1 Downstream Analysis has been performed for the subject site and is described as follows: A site visit was conducted by a Barghausen Consulting Engineers, Inc. engineer on August 13, 2018. Task 1: The study area consists of the subject site, surrounding sites of Fred Meyer Fuel, a strip mall to the west, and a Firestone automotive shop to the north. It also includes the site frontages along Rainier Avenue South to the east and Renton Center Way to the south. Storm infrastructure carries captured stormwater north in the Rainier Avenue right-of-way. See Figure 3.1 for a Downstream Analysis Map. Task 2: Upon Review of the site survey, performed by Barghausen Consulting Engineers, Inc., dated February 7, 2018, and available City of Renton GIS information and as-built drawings, a complete study of the current on-site and surrounding area was completed. See Figure 3.1 for a Downstream Analysis Map that shows the downstream infrastructure a quarter of a mile downstream of the site. The final outfall of the site is the Black River Drainage Basin approximately 2 miles downstream. Task 3: A site visit was conducted by a Barghausen Consulting Engineers, Inc. engineer on August 13, 2018. The weather was clear and sunny, the temperature was 88 degrees. A thorough investigation of the downstream infrastructure was conducted due to some incorrect information regarding downstream flow direction on the GIS information. The flow direction of adjacent infrastructure in the right-of-way was verified. Task 4: Upon Review of all off-site stormwater conveyance, there are no anticipated concerns regarding the proposed site stormwater runoff contributing to the existing stormwater conveyance. The site lies within a built-up urban environment with well-established stormwater infrastructure. The site lies within the Peak Rate Flow Control Standard (Existing Site Conditions) area as depicted in Reference 15-A of the City of Renton Surface Water Design Manual (included in this report as Figure 3.2). The proposed site improvements will include some BMP implementation such as treatment with a bio-retention facility for a portion of the impervious areas of the site. The proposed site will create a net increase in overall impervious area; however, implementation of the required BMPs will help to match the previous site discharge rate. For these reasons there are no foreseeable negative effects on the existing off-site stormwater infrastructure.