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Lake Samish Basin Comprehensive Stormwater Plan   

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Lake Samish Basin Comprehensive Stormwater Plan    Lake Samish Basin Comprehensive Stormwater Plan Prepared for Prepared by TABLE OF CONTENTS June 1, 2012 II LAKE SAMISH COMPREHENSIVE STORMWATER PLAN Lake Samish Basin Comprehensive Stormwater Plan Prepared for Whatcom County, Washington Prepared by June 1, 2012 TABLE OF CONTENTS TABLE OF CONTENTS Acronyms and Abbreviations ................................................................................ iv Executive Summary .............................................................................................. vii 1 Introduction and Background ........................................................................ 1-1 1.1 Goals and Objectives of the Comprehensive Stormwater Plan.............................1-1 1.2 Factors Driving Plan Development .......................................................................1-6 1.3 Previous Planning Efforts within the Lake Samish Basin ......................................1-8 1.4 Prior Stormwater Programmatic Efforts in Basin...................................................1-9 1.5 Review of Past and Ongoing Monitoring, Modeling ............................................ 1-10 1.6 Completed Stormwater Improvement Project ..................................................... 1-11 1.7 Whatcom County Involvement in Plan Development ......................................... 1-11 1.8 Public Outreach Regarding Stormwater ............................................................. 1-11 2 Lake Samish Watershed Characteristics and Conditions Assessment ..... 2-1 2.1 Lake Characteristics .............................................................................................2-1 2.2 Basin Characteristics ...........................................................................................2-1 2.3 Sub-basin Characteristics ....................................................................................2-4 2.4 Critical Areas ...................................................................................................... 2-11 2.5 Built Environment ............................................................................................... 2-13 2.6 Surface Water Conditions, Issues and Problems ............................................... 2-14 2.7 Monitoring, Modeling, and Other Ongoing Studies ............................................. 2-19 2.8 Summary ........................................................................................................... 2-24 3 Review of Relevant Regulations and Plans................................................... 3-1 3.1 Relevant Whatcom County Codes .......................................................................3-2 3.2 Relevant Whatcom County Plans, Programs, and Standards ...............................3-7 3.3 Relevant Skagit County Planning Efforts ..............................................................3-8 3.4 Relevant Washington State Standards .................................................................3-9 3.5 Recommendations Based Upon the Review of Whatcom County Codes, Plans, Programs, and Standards ....................................................................... 3-11 4 Stormwater Related Maintenance and Operations Programs ..................... 4-1 4.1 M&O Responsibilities and Activities by Jurisdiction ..............................................4-2 4.2 Summary of M&O ............................................................................................... 4-15 5 Capital Improvements ..................................................................................... 5-1 5.1 Stormwater Management Capital Improvements ..................................................5-4 5.2 Lake-Level Management Capital Improvements ................................................ 5-10 6 Programmatic and Capital Project Recommendations ................................ 6-1 6.1 Grouping and Ranking the Recommendations .....................................................6-1 6.2 Programmatic and Capital Recommendations .....................................................6-2 6.3 Relative Ranking of Programmatic Activities ...................................................... 6-14 7 Governance and Funding ............................................................................... 7-1 7.1 Governance for Stormwater and Lake-Level Management in Lake Samish Basin ...................................................................................................................7-1 7.2 Funding Strategies and Rate Projections for the Lake Samish Basin ...................7-4 7.3 Capital Project Funding Recommendations ........................................................ 7-13 7.4 Summary of Governance and Funding Recommendations ................................ 7-15 8 References ....................................................................................................... 8-1 LAKE SAMISH COMPREHENSIVE STORMWATER PLAN I Appendices Appendix A-1 Water Quality Monitoring Appendix A-2 Hydrologic Modeling Appendix A-3 Codes and Regulations Review Appendix A-4 Maintenance and Operations Appendix A-5 Programmatic Solutions Appendix B Public Comments on Issues Appendix C Capital Improvement Projects Tables Table 1-1. Plan Objectives and Corresponding Measures of Performance ....................... 1-4 Table 2-1. Lake Samish Watershed Sub-basins ............................................................... 2-4 Table 2-2. Summary of Critical Areas in the Lake Samish Basin .................................... 2-11 Table 2-3. Existing and Future Impervious Areas in the Lake Samish Basin .................. 2-13 Table 2-4. General Trophic State Indices ....................................................................... 2-15 Table 2-5. Potential Surface Water Pollutants and Sources ............................................ 2-16 Table 2-6. Past Monitoring and Modeling Studies ........................................................... 2-19 Table 3-1. - Whatcom County Code Titles Relevant to Lake Samish Basin Stormwater .... 3-2 Table 3-2. Areas of Zoning Classifications within Lake Samish Basin ............................. 3-5 Table 3-3. – Whatcom County Plans, Programs and Standards Relevant to Lake Samish Basin Stormwater .............................................................................................................. 3-7 Table 3-4. – Skagit County Planning Relevant to Lake Samish Basin Stormwater ............ 3-8 Table 3-5. – Washington State Authority Relevant to Lake Samish Basin Stormwater ...... 3-9 Table 4-1. Whatcom County Stormwater Infrastructure in Lake Samish Basin ................. 4-2 Table 4-2. WSDOT Stormwater Infrastructure within the Lake Samish Watershed ........... 4-7 Table 4-3. Forest Land Stormwater Infrastructure within the Lake Samish Watershed ..... 4-9 Table 4-4. Private Stormwater and Sewer Infrastructure in the Lake Samish Basin ....... 4-12 Table 5-1. Summary of Lake Samish Basin Capital Improvements .................................. 5-3 Table 6-1. Monitoring & Modeling Recommendations ...................................................... 6-3 Table 6-2. Code and Planning Recommendations (C&P) ................................................. 6-5 Table 6-3. Maintenance & Operations Recommendations (M&O) .................................... 6-6 Table 6-4. General Programmatic Recommendations (GPR) ......................................... 6-10 Table 6-5. Public Participation Opportunities (PPO) ....................................................... 6-12 Table 6-6. Capital Improvement Projects (CIP) .............................................................. 6-13 Table 6-7. Example Ranking System for Programmatic Recommendations .................... 6-15 Table 7-1. Samish Watershed Subzone - Strategies to Fund Stormwater and Lake-level Programmatic Activities ..................................................................................................... 7-6 Table 7-2. - Summary of Costs and Potential Revenue Sources for Programmatic “Basic / Now” Activities ................................................................................................................. 7-10 Table 7-3. - Summary of Costs and Potential Revenue Sources for Programmatic "Special / Later" Activities ............................................................................................................... 7-11 Table 7-4. - Summary of Costs and Potential Revenue Sources for Capital Improvements . 7- 12 Table 7-5. - Capital Improvement Plan and Suggested Timeline ..................................... 7-14 II LAKE SAMISH COMPREHENSIVE STORMWATER PLAN TABLE OF CONTENTS Figures Figure 1-1. Lake Samish Basin ........................................................................................ 1-3 Figure 2-1. Lake Samish Basin – Soil Drainage Classifications ........................................ 2-3 Figure 2-2. Lake Samish Basin – Drainage Sub-basins .................................................... 2-5 Figure 2-3. Lake Samish Basin – Zoning Designations .................................................... 2-6 Figure 2-4. Land Use in Lake Samish Basin ................................................................... 2-14 Figure 2-5. Timeline of Trophic States for Lake Samish ................................................. 2-15 Figure 2-6. Lake Samish Basin – Lake and Tributary Monitoring Sites ........................... 2-21 Figure 3-1. Lake Samish Basin Zoning Designations .....................................................
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