Environmental Protection New York City Department of Combined Sewer Overflow Environmental Protection Long Term Control Plan for Capital Project No. WP-169 Coney Island Creek Long Term Control Plan II " f 0 () rn s: )> () z 0 ~ 0 .. -u 2 ?s l> '.2 r -< 0 ~,..b-1 l> < m June 2016 11¥1: Capital Project No. WP-169 Environmental Long Term Control Plan 11 Protection Combined Sewer Overflow Long Term Control Plan for Coney Island Creek June 2016 Keith Mahoney, P.E. NY License No. 074169 .,· The City of New York Department of Environmental Protection Bureau of Wastewater Treatment Prepared by: AECOM USA, Inc. CSO Long Term Control Plan II Long Term Control Plan Coney Island Creek TABLE OF CONTENTS EXECUTIVE SUMMARY ...................................................................................................... ES-1 1.0 INTRODUCTION ..........................................................................................................1-1 1.1 Goal Statement ................................................................................................................ 1-1 1.2 Regulatory Requirements (Federal, State, Local) ........................................................... 1-2 1.3 LTCP Planning Approach ................................................................................................ 1-3 2.0 WATERSHED/WATERBODY CHARACTERISTICS ...................................................2-1 2.1 Watershed Characteristics ............................................................................................... 2-1 2.2 Waterbody Characteristics ............................................................................................. 2-22 3.0 CSO BEST MANAGEMENT PRACTICES ...................................................................3-1 3.1 Collection System Maintenance and Inspection Program ............................................... 3-3 3.2 Maximizing Use of Collection System for Storage ........................................................... 3-3 3.3 Maximizing Wet Weather Flow to WWTPs ...................................................................... 3-3 3.4 Wet Weather Operating Plan ........................................................................................... 3-4 3.5 Prohibition of Dry Weather Overflows .............................................................................. 3-5 3.6 Industrial Pretreatment Program ...................................................................................... 3-5 3.7 Control of Floatables and Settleable Solids ..................................................................... 3-6 3.8 Combined Sewer Replacement ....................................................................................... 3-6 3.9 Combined Sewer Extension ............................................................................................. 3-6 3.10 Sewer Connection & Extension Prohibitions ................................................................... 3-7 3.11 Septage and Hauled Waste ............................................................................................. 3-7 3.12 Control of Runoff .............................................................................................................. 3-7 3.13 Public Notification ............................................................................................................. 3-7 3.14 Characterization and Monitoring ...................................................................................... 3-8 3.15 CSO BMP Report Summaries ......................................................................................... 3-8 4.0 GREY INFRASTRUCTURE .........................................................................................4-1 4.1 Status of Grey Infrastructure Projects Recommended in Facility Plans .......................... 4-1 4.2 Other Water Quality Improvement Measures Recommended in Facility Plans (Dredging, Floatables, Aeration) ...................................................................................... 4-6 4.3 Post-Construction Monitoring ........................................................................................... 4-6 5.0 GREEN INFRASTRUCTURE .......................................................................................5-1 5.1 NYC Green Infrastructure Plan (GI Plan)......................................................................... 5-1 5.2 Citywide Coordination and Implementation ..................................................................... 5-2 5.3 Completed Green Infrastructure to Reduce CSOs (Citywide and Watershed) ............... 5-4 5.4 Future Green Infrastructure in the Watershed ................................................................. 5-9 6.0 BASELINE CONDITIONS AND PERFORMANCE GAP ..............................................6-1 6.1 Define Baseline Conditions .............................................................................................. 6-1 6.2 Baseline Conditions – Projected CSO Volumes and Loadings after the Facility Plan and GI Plan .............................................................................................................. 6-4 6.3 Performance Gap ............................................................................................................. 6-8 Submittal: June 30, 2016 i AE'COM CSO Long Term Control Plan II Long Term Control Plan Coney Island Creek 7.0 PUBLIC PARTICIPATION AND AGENCY COORDINATION ......................................7-1 7.1 Local Stakeholder Team .................................................................................................. 7-1 7.2 Summaries of Stakeholder Meetings ............................................................................... 7-1 7.3 Coordination with Highest Attainable Use ....................................................................... 7-4 7.4 Internet Accessible Information Outreach and Inquiries .................................................. 7-4 8.0 EVALUATION OF ALTERNATIVES ............................................................................8-1 8.1 Considerations for LTCP Alternatives Under the Federal CSO Policy ............................ 8-1 8.2 Matrix of Potential CSO Reduction Alternatives to Close Performance Gap from Baseline ................................................................................................................... 8-8 8.3 CSO Reductions and Water Quality Impact of Retained Alternatives ........................... 8-19 8.4 Cost Estimates for Retained Alternatives ...................................................................... 8-22 8.5 Cost-Attainment Curves for Retained Alternatives ........................................................ 8-24 8.6 Use Attainability Analysis ............................................................................................... 8-39 8.7 Water Quality Goals ....................................................................................................... 8-41 8.8 Recommended LTCP Elements to Meet Water Quality Goals ...................................... 8-43 9.0 LONG-TERM CSO CONTROL PLAN IMPLEMENTATION .........................................9-1 9.1 Adaptive Management (Phased Implementation) ............................................................ 9-1 9.2 Implementation Schedule ................................................................................................ 9-1 9.3 Operational Plan/O&M (Operation and Maintenance) ..................................................... 9-1 9.4 Projected Water Quality Improvements ........................................................................... 9-1 9.5 Post Construction Monitoring Plan and Program Reassessment .................................... 9-2 9.6 Consistency with Federal CSO Policy ............................................................................. 9-2 9.7 Compliance with Water Quality Goals ........................................................................... 9-35 10.0 REFERENCES ........................................................................................................... 10-1 11.0 GLOSSARY ............................................................................................................... 11-1 APPENDICES Appendix A: Supplemental Tables Appendix B: Public Meeting Materials Appendix C: Use Attainability Analysis Submittal: June 30, 2016 ii AE'COM CSO Long Term Control Plan II Long Term Control Plan Coney Island Creek LIST OF TABLES Table ES-1. Classifications and Standards Applied .............................................................................. ES-3 Table ES-2. Calculated 2008 Baseline Fecal Coliform Maximum Monthly GM and Attainment of Existing WQ Criteria ......................................................................................................... ES-10 Table ES-3. Calculated Baseline DO Attainment – Existing WQ Criteria (2008) Station .................... ES-10 Table ES-4. Comparison of the Calculated 2008 Baseline and 100% Coney Island Creek CSO Control Fecal Coliform Maximum Monthly GM and Attainment of Bacteria Primary Contact WQ Criteria ......................................................................................................... ES-11 Table ES-5. Model Calculated 2008 Baseline and 100% CSO Control DO Attainment of Class SC WQ Criteria ...................................................................................................................... ES-12 Table ES-6. Calculated 2008 Baseline