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City of Richmond, Virginia Department of Public Utilities CSO Interim Plan Report

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City of Richmond, Virginia Department of Public Utilities CSO Interim Plan Report City of Richmond, Virginia Department of Public Utilities CSO Interim Plan Report July 1, 2021 Prepared by Brown and Caldwell Interim Plan Report Legend for Cover Photos: 1. Patrick Griffin: Founder and Instructor for RVA Paddlesports 2. Mark Lewis: Senior Construction Inspector for Richmond DPU Stormwater Utility 3. Susan Mitchell: Senior Account Director for West Cary Group Richmond DPU | RVAH2O Interim Plan Report Table of Contents Table of Contents List of Tables ................................................................................................................................................ ii List of Figures .............................................................................................................................................. iii List of Abbreviations ................................................................................................................................... iv 1. Executive Summary ...........................................................................................................................1-1 1.1 Background .............................................................................................................................1-1 1.2 Interim Plan Purpose ..............................................................................................................1-1 1.3 Project Identification...............................................................................................................1-2 1.4 Initial Screening ......................................................................................................................1-2 1.5 Project Evaluation ...................................................................................................................1-3 1.6 Final Screening .......................................................................................................................1-4 1.7 Project Selection .....................................................................................................................1-4 2. Introduction .......................................................................................................................................2-1 2.1 Combined Sewer System History ...........................................................................................2-1 2.2 Amendment to the 2005 Special Order by Consent ............................................................2-2 2.3 Interim Plan Purpose ..............................................................................................................2-3 3. System Characterization ...................................................................................................................3-1 3.1 Combined Sewer System Description ...................................................................................3-1 3.2 System Monitoring Data .........................................................................................................3-9 3.2.1 Rainfall Data .......................................................................................................... 3-10 3.2.2 Flow and Level Data .............................................................................................. 3-11 3.3 CSS Hydrologic and Hydraulic Modeling ............................................................................ 3-12 3.3.1 Model Updates ...................................................................................................... 3-12 3.3.2 Existing Conditions ................................................................................................ 3-12 3.3.3 Baseline Scenario .................................................................................................. 3-12 3.4 Receiving Water Data .......................................................................................................... 3-13 3.5 Water Quality Modeling ....................................................................................................... 3-15 3.5.1 Model Updates ...................................................................................................... 3-15 3.5.2 Existing Conditions ................................................................................................ 3-15 3.5.3 Baseline Scenario .................................................................................................. 3-15 4. Project Identification .........................................................................................................................4-1 4.1 RT-DSS Controls ......................................................................................................................4-1 4.2 Project Types ...........................................................................................................................4-1 4.2.1 In-Line Storage ..........................................................................................................4-2 4.2.2 Diversion ...................................................................................................................4-3 4.2.3 Dynamic Underflow Control .....................................................................................4-4 4.2.4 Controls Update ........................................................................................................4-5 Richmond DPU | RVAH2O i Interim Plan Report Table of Contents 4.3 Initial Project Screening .........................................................................................................4-5 5. Project Evaluation .............................................................................................................................5-1 5.1 Performance Evaluation .........................................................................................................5-1 5.1.1 CSS H&H Model Results ..........................................................................................5-1 5.1.2 Receiving Water Quality Model Results ..................................................................5-4 5.2 Qualitative Evaluation .............................................................................................................5-5 5.3 Cost Estimates ........................................................................................................................5-8 5.4 Cost Effectiveness Evaluation ............................................................................................. 5-11 5.5 Project Evaluation Summary ............................................................................................... 5-13 6. Project Selection ...............................................................................................................................6-1 6.1 Selected Interim Plan Projects ...............................................................................................6-1 6.2 Implementation Schedule ......................................................................................................6-3 6.3 Proposed Funding Strategies .................................................................................................6-5 6.4 Remaining Special Order Project Comparison ......................................................................6-6 7. Stakeholder Engagement .................................................................................................................7-1 Appendix A: Amendment to the 2005 Special Order by Consent .......................................................... A-1 Appendix B: CSS H&H Model Documentation ........................................................................................ B-1 Appendix C: Water Quality Model Documentation ..................................................................................C-1 Appendix D: Interim Plan Project Details ................................................................................................ D-1 Appendix E: DEQ Substitution Approval Letter ........................................................................................ E-1 Appendix F: Stakeholder Engagement Materials .................................................................................... F-1 List of Tables Table 1-1. Summary of Selected Interim Plan Projects .........................................................................1-5 Table 3-1. Baseline Scenario Water Quality Improvement.................................................................. 3-15 Table 4-1. Summary of Identified Projects .............................................................................................4-6 Table 5-1. Project Performance Evaluation Summary ...........................................................................5-2 Table 5-2. Water Quality Modeling Evaluation Summary ......................................................................5-4 Table 5-3. Qualitative Evaluation Criteria ...............................................................................................5-5 Table 5-4. Project Qualitative Assessment Summary ............................................................................5-6 Table 5-5. Project Cost Estimate Summary ............................................................................................5-9 Table 5-6. Project Cost Effectiveness Summary ................................................................................. 5-11 Table 5-7. Project Evaluation Summary .............................................................................................
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