City of Lacey 2010 Stormwater Design Manual This Page Intentionally Left Blank City of Lacey 2010 Stormwater Design Manual Table of Contents Acknowledgments ............................................................................................................ xiii Introduction ...........................................................................................................................xv Chapter 1 - Stormwater Drainage Requirements for New Development and Redevelopment 1.1 Drainage Review .................................................................................................1-1 1.1.1 Drainage Review Types and Requirements .………………...…………1-5 1.1.2 Exemptions ………………………………. .………………...………… 1-6 1.2 Core Requirements............................................................................................... 1-6 1.2.1 Core Requirement #1: Preparation of Stormwater Site Plans and Reports…………………………………………………………………..1-7 1.2.2 Core Requirement #2: Construction Stormwater Pollution Prevention . 1-7 1.2.2.1 The Twelve Elements of Construction SWPPPs …………….. 1-8 1.2.3 Core Requirement #3: Source Control of Pollution ………………… 1-15 1.2.4 Core Requirement #4: Preservation of Natural Drainage Systems and Outfalls ………………………………………………………………. 1-16 1.2.5 Core Requirement #5: Onsite Stormwater Management...…………… 1-17 1.2.6 Core Requirement #6: Runoff Water Quality Treatment……………. 1-18 1.2.7 Core Requirement #7: Flow Control ………………………………… 1-20 1.2.8 Core Requirement #8: Wetlands Protection ………………………… 1-23 1.2.9 Core Requirement #9: Operation and Maintenance …………………. 1-25 1.2.10 Core Requirement #10: Agreements and Financial Guarantees .......... 1-25 1.3 Supplemental Requirements.............................................................................. 1-26 1.3.1 Supplemental Requirement #1: Basin/Watershed Planning ................. 1-26 1.3.2 Supplemental Requirement #2: Off-site Analysis and Mitigation........ 1-26 1.4 Additional Requirements ..................................................................................1-26 City of Lacey 2010 Stormwater Design Manual Page i 1.5 Easements and Setbacks ................................................................................... 1-27 1.5.1 Easements .............................................................................................1-27 1.5.2 Setbacks................................................................................................. 1-28 1.6 Adjustments ....................................................................................................... 1-29 1.7 Exceptions and Variances.................................................................................. 1-29 1.8 Related Permits, Manuals and Plans …………………………………………..1-30 1.8.1 Western Washington Phase II Municipal Stormwater Permit ............... 1-30 1.8.2 Low Impact Development Technical Guidance Manual for Puget Sound...................................................................................... 1-30 1.8.3 Basin and Watershed Plans.................................................................... 1-30 1.8.4 Other State and Federal Permits ........................................................... 1-31 Appendix 1A: Guidance for Altering Core Requirements through Basin Planning .. 1A-1 Chapter 2 - Drainage Plans and Reports 2.1 Drainage Review Types and Submittals............................................................. 2-2 2.1.1 Pre-Submittal Conference ...................................................................... 2-4 2.1.2 Plans Required for Permit Submittal ..................................................... 2-4 2.1.3 Plans Required for Drainage Review ..................................................... 2-4 2.1.4 Design Plan Certification ....................................................................... 2-4 2.2 Drainage Submittals for Initial Permit Application ........................................... 2-5 2.2.1 Subdivisions and Binding Site Plans ..................................................... 2-5 2.2.2 Commercial and Industrial Site Development ....................................... 2-6 2.2.3 Short Subdivisions and Single-Family Residences ............................... 2-6 2.3 Stormwater Site Plans for Drainage Review ...................................................... 2-6 2.3.1 Drainage Plan Specifications ................................................................. 2-7 2.3.1.1 Site Improvement Plans ........................................................... 2-8 2.3.1.2 Temporary Erosion and Sediment Control Plans ..................... 2-9 2.3.2 Drainage Report Specifications ........................................................... 2-11 2.4 Preparation of Stormwater Site Plans .............................................................. 2-20 2.4.1 Stormwater Site Plans: Step-by-Step ................................................... 2-20 2.5 Plans Required After Drainage Review............................................................ 2-26 2.5.1 Plan Changes After Permit Issuance .................................................... 2-26 2.5.2 Final Corrected Plan Submittal ............................................................ 2-26 2.5.3 Final Plat, Short Plat and Binding Site Plan Submittals ...................... 2-26 2.6 Plans Required After Stormwater Site Plan Approval...................................... 2-27 2.6.1 Stormwater Site Plan Changes ............................................................. 2-27 2.6.2 Final Corrected Plan Submittal ............................................................ 2-27 Appendix 2A: Standard Notes for Stormwater Drainage Plans ................................ 2A-1 Appendix 2B: Checklist for Development Project Drainage Submittal ..................... 2B-1 Page ii City of Lacey 2010 Stormwater Design Manual Chapter 3 - Site and Vicinity Analysis 3.1 Site Analysis........................................................................................................ 3-1 3.1.1 Site Planning for Stormwater .................................................................. 3-1 3.1.2 Preliminary Drainage Analysis ...............................................................3-2 3.1.3 Soils Report.............................................................................................. 3-3 3.1.4 On-Site and Adjacent Critical Areas ....................................................... 3-3 3.1.5 Feasibility of Low Impact Development ................................................ 3-4 3.2 Vicinity Analysis................................................................................................. 3-5 3.2.1 Six Tasks of Vicinity Analysis ................................................................ 3-5 Appendix 3A: Soil Report Requirements and Forms ................................................ 3A-1 Appendix 3B: Facility Summary Form ....................................................................... 3B-1 Chapter 4 - Construction Erosion and Sediment Control and Stormwater Pollution Prevention 4.1 General ESC Requirements and Guidelines ........................................................ 4-1 4.2 TESC Design Procedure ...................................................................................... 4-2 4.3 Standards and Specifications for ESC BMPs ...................................................... 4-8 BMP C101: Preserving Natural Vegetation ................................................... 4-9 BMP C102: Buffer Zones ............................................................................ 4-12 BMP C103: High Visibility Plastic or Metal Fence ...................................... 4-13 BMP C104: Stake and Wire Fence .............................................................. 4-14 BMP C105: Stabilized Construction Entrance ............................................. 4-15 BMP C106: Wheel Wash ............................................................................. 4-17 BMP C107: Construction Road/Parking Area Stabilization ........................ 4-19 BMP C120: Temporary and Permanent Seeding ......................................... 4-20 BMP C121: Mulching .................................................................................. 4-26 BMP C122: Nets and Blankets .................................................................... 4-28 BMP C123: Plastic Covering ....................................................................... 4-32 BMP C124: Sodding .................................................................................... 4-34 BMP C125: Topsoiling ................................................................................ 4-35 BMP C126: Polyacrylamide for Soil Erosion Protection ............................ 4-38 BMP C130: Surface Roughening ................................................................. 4-42 BMP C131: Gradient Terraces ..................................................................... 4-44 BMP C140: Dust Control …......................................................................... 4-46 BMP C150: Materials On Hand ................................................................... 4-48 BMP C151: Concrete Handling ................................................................... 4-49 BMP C152: Sawcutting and Surfacing Pollution Prevention ..................... 4-50 BMP C153: Material Delivery, Storage and Containment .......................... 4-51 BMP C160: Certified Erosion and Sediment Control Lead ......................... 4-53 BMP C161: Payment