City of Tacoma Surface Water Management Manual

Transcription

1 City of Tacoma Surface Water Management Manual Volume I Minimum Technical Requirements and Site Planning Prepared by: Tacoma Public Works Environmental Services January 2003

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3 Table of Contents Acknowledgements...i Chapter 1 Introduction Objective Relationship to Ecology s Stormwater Manual Organization of this Manual Overview of Manual Content Organization of this Manual Organization of Volume How to Use this Manual Development of Best Management Practices for Stormwater Management Best Management Practices (BMPs) Source Control BMPs Treatment BMPs Flow Control BMPs Relationship of this Manual to Federal, State, and Local Regulatory Requirements The Puget Sound Water Quality Management Plan Phase I Ecology s NPDES and State Waste Discharge Stormwater Permits for Municipalities Phase II Ecology s NPDES and State Waste Discharge Stormwater Permits for Municipalities Ecology s State Waste Discharge Permits for Direct Discharges Ecology s Industrial Stormwater Permit (i.e. NPDES and State Waste Discharge Baseline General Permit for Stormwater Discharges Associated With Industrial Activities) Ecology s Construction Stormwater Permit (i.e. NPDES and State Waste Discharge General Permit for Stormwater Discharges Associated With Construction Activity) Endangered Species Act Section 401 Water Quality Certifications Hydraulic Project Approvals (HPAs) Aquatic Lands Use Authorizations January 2003 Volume I Minimum Technical Requirements TOC-1

4 Requirements Identified through Watershed/Basin Planning or Total Maximum Daily Loads Underground Injection Control Authorizations Other City Requirements Effects of Urbanization Hydrologic Changes Water Quality Changes Biological Changes Chapter 2 Tacoma s Watersheds and Subwatersheds Introduction Watershed Designations Drainage Basin Planning Basin and Watershed Plans Larger Watershed Plans Hylebos Creek and Lower Puget Sound Basin Lower Puyallup Watershed Action Plan Clover-Chambers Creek Watershed Management Plan Land Use Land Use Regulations Land Use Plans Impaired Waterbodies Tacoma s Watersheds Flett Creek Wapato Lake Snake Lake South Tacoma Ground Water Protection District Leach Creek Landfill Superfund Site Northeast Tacoma Joe s Creek North Tacoma Thea Foss Waterway Tideflats Sitcum Waterway Hylebos Waterway TOC-2 Volume I Minimum Technical Requirements January 2003

5 Blair Waterway Middle Waterway T-Street/Lower Puyallup Puyallup River Swan Creek T-Street Gulch Western Slopes Watershed Flow Control Requirements for Specific Watersheds Overview In-Lieu-Of Flow Control Policy Chapter 3 Minimum Requirements for New Development and Redevelopment Relationship to Ecology s 2001 Stormwater Management Manual and the Puget Sound Water Quality Management Plan Exemptions Forest Practices Road Maintenance Underground Utility Projects Minor Clearing and Grading Emergencies Definitions Related to Minimum Requirements Applicability of the Minimum Requirements New Development Redevelopment Minimum Requirements Minimum Requirement #1: Preparation of Stormwater Site Plans Minimum Requirement #2: Construction Stormwater Pollution Prevention (SWPP) Element 1: Mark Clearing Limits Element 2: Establish Construction Access Element 3: Control Flow Rates Element 4: Install Sediment Controls Element 5: Stabilize Soils Element 6: Protect Slopes Element 7: Protect Drain Inlets January 2003 Volume I Minimum Technical Requirements TOC-3

6 Element 8: Stabilize Channels and Outlets Element 9: Control Pollutants Element 10: Control De-Watering Element 11: Maintain BMPs Element 12: Manage The Project Minimum Requirement #3: Source Control of Pollution Minimum Requirement #4: Preservation of Natural Drainage Systems and Outfalls Minimum Requirement #5: On-Site Stormwater Management Minimum Requirement #6: Runoff Treatment Minimum Requirement #7: Flow Control Applicability Exemptions Thresholds Modeling Guidelines Minimum Requirement #8: Wetlands Protection Minimum Requirement #9: Basin/Watershed Planning Minimum Requirement #10: Operation and Maintenance Additional Requirements Additional Requirement #1 Off-Site Analysis and Mitigation Additional Requirement #2: Financial Liability Exceptions Chapter 4 Preparation of Stormwater Site Plans Stormwater Site Plans: Step-By-Step Step 1 Collect and Analyze Information on Existing Conditions Step 2 Prepare Preliminary Development Layout Step 3 Perform an Offsite Analysis Step 4 Determine and Read the Applicable Minimum Requirements Step 5 Prepare a Permanent Stormwater Control Plan Step 6 Prepare a Construction Stormwater Pollution Prevention Plan Step 7 Complete the Stormwater Site Plan Step 8 Check Compliance with All Applicable Minimum Requirements TOC-4 Volume I Minimum Technical Requirements January 2003

7 4.2 Plans Required After Stormwater Site Plan Approval Stormwater Site Plan Changes Final Corrected Plan Submittal Chapter 5 BMP and Facility Selection Process for Permanent Stormwater Control Plans Purpose BMP and Facility Selection Process Step I Determine and Read the Applicable Minimum Requirements Step II Select Source Control BMPs Step III Determine Threshold Discharge Areas and Applicable Requirements for Treatment, Flow Control, and Wetlands Protection Step IV Select Flow Control BMPs and Facilities Step V Select Treatment Facilities Step VI Review Selection of BMPs and Facilities Step VII Complete Development of Permanent Stormwater Control Plan References...Ref-1 Glossary and Notations... Glossary-1 Appendices Appendix I-A Appendix I-B Appendix I-C Appendix I-D Appendix I-E Appendix I-F Appendix I-G Guidance for Altering the Minimum Requirements Through Basin Planning Water Quality Treatment Design Storm, Volume, and Flow Rate Basic Treatment Receiving Waters Wetlands and Stormwater Management Guidelines Submittal Requirements Checklist Bond Quantities Worksheet Hydraulic Analysis Worksheet January 2003 Volume I Minimum Technical Requirements TOC-5

8 Tables Watershed Flow Control Requirements if Applicable Thresholds are Met per Minimum Requirement # In-Lieu-Of Flow Control In-Lieu-Of Flow Control Treatment Requirements by Threshold Discharge Area Project Flow Control Requirements by Threshold Discharge Area Suggested Stormwater Treatment Options for New Development and Redevelopment Projects Ability of Treatment Facilities to Remove Key Pollutants Screening Treatment Facilities Based on Soil Type Figures 2-1 City of Tacoma Watersheds South Tacoma Groundwater Protection District Map Threshold Discharge Areas Flow Chart for Determining Requirements for New Development Flow Chart for Determining Requirements for Redevelopment Flow Chart for Determining Flow Control for New Development and Redevelopment within a Given Threshold Discharge Area Treatment Facility Selection Flow Chart TOC-6 Volume I Minimum Technical Requirements January 2003

9 Acknowledgements The development of this Surface Water Management Manual was made possible through the assistance and consultation of many people, not only those within the City, but those working for other agencies, engineering firms and those affiliated with environmental groups. The City of Tacoma would like to thank the following people for their time and expertise devoted to the development of this Manual. In addition, the City would also like to specifically acknowledge the assistance of Sandra Kilroy of King County and Heather Kibbey of Pierce County in developing the information utilized in Volume IV, Source Control BMPs. City of Tacoma Surface Water Manual Team John Burk (Project Manager) Dana De Leon Sandi Holdener Chris Johnson Lorna Mauren Anne Spangler Christy Strand City of Tacoma Public Works Department Administration Karen Larkin Bill Pugh Craig Sivley John Stetson Building and Land Use Services Division Karla Kluge Sue Martin Cap Pearson Gary Pedersen Pete Rambow Construction Division Dan Handa Kris McColeman Tina Nelson Steve Nichols Engineering Division James Coffman Mike Dalin JB Hur Chris Larson Dan Seabrands Science and Engineering Division Ryan Flynn Spencer Keene Tim Sparling Catherine Taylor January 2003 Volume I Minimum Technical Requirements i

10 Name Tony Barrett Stan Ciuba Scott Hanson Larry Hires Heather Kibbey Sandra Kilroy Donna Lynch Ed O Brien Heather Pennington Anna Thurston Cynthia Stonick Kelly Whiting Affiliation Washington State Department of Ecology Washington State Department of Ecology Puget Creek Restoration Society Sitts and Hill Engineers, Inc. Pierce County King County Washington State Department of Ecology Washington State Department of Ecology Tacoma Water Tacoma Water Washington State Department of Ecology King County TOC-ii Volume I Minimum Technical Requirements January 2003