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CSO-LTCP Alley Creek & Little Neck Bay Final LTCP

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CSO-LTCP Alley Creek & Little Neck Bay Final LTCP New York City Department of Combined Sewer Overflow Environmental Protection Long Term Control Plan for Capital Project No. WP-169 Alley Creek and Little Neck Bay Long Term Control Plan II June 2014 Capital Project No. WP-169 Environmental Long Term Control Plan 11 Protection Combined Sewer Overflow Long Term Control Plan for Alley Creek and Little Neck Bay June 2014 Keith W. Beckmann, P.E. NY License No. 066623 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 Alley Creek and Little Neck Bay 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 ................................................................................................ 1-4 2.0 WATERSHED/WATERBODY CHARACTERISTICS ...................................................2-1 2.1 Watershed Characteristics ............................................................................................... 2-1 2.2 Waterbody Characteristics ............................................................................................. 2-33 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 .............................................................................. 3-4 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 and Extension Prohibitions ................................................................ 3-6 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) ........................................................................................ 4-2 4.3 Post-Construction Monitoring ........................................................................................... 4-2 5.0 GREEN INFRASTRUCTURE .......................................................................................5-1 5.1 NYC Green Infrastructure Plan (GI Plan)......................................................................... 5-1 5.2 City-wide 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 ...................................................................................................................... 6-5 6.3 Performance Gap ............................................................................................................. 6-6 Submittal: June 30, 2014 i CSO Long Term Control Plan II Long Term Control Plan Alley Creek and Little Neck Bay 7.0 PUBLIC PARTICIPATION AND AGENCY COORDINATION ......................................7-1 7.1 Local Stakeholder Team .................................................................................................. 7-1 7.2 Summaries of Stakeholder Meetings ............................................................................... 7-2 7.3 Coordination with Highest Attainable Use ....................................................................... 7-4 7.4 Internet Accessible Information Outreach and Inquiries .................................................. 7-5 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 ......................................................................................................................... 8-10 8.3 CSO Reductions and Water Quality Impact of Retained Alternatives ........................... 8-31 8.4 Cost Estimates for Retained Alternatives ...................................................................... 8-35 8.5 Cost-Attainment Curves for Retained Alternatives ........................................................ 8-37 8.6 Use Attainability Analysis (UAA) .................................................................................... 8-50 8.7 Water Quality Goals ....................................................................................................... 8-54 8.8 Recommended LTCP Elements to Meet Water Quality Goals ...................................... 8-59 9.0 LONG-TERM CSO CONTROL PLAN IMPLEMENTATION .........................................9-1 9.1 Adaptive Management (Phased Implementation) ............................................................ 9-1 9.2 Implementation Schedule ................................................................................................ 9-2 9.3 Operation Plan/O&M ........................................................................................................ 9-2 9.4 Projected Water Quality Improvements ........................................................................... 9-3 9.5 Post Construction Monitoring Plan and Program Reassessment .................................... 9-3 9.6 Consistency with Federal CSO Policy ............................................................................. 9-3 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: Long Term Control Plan (LTCP) Alley Creek Kickoff Meeting - Summary of Meeting and Public Comments Received Appendix C: Long Term Control Plan (LTCP) Alley Creek Public Meeting #2 - Summary of Meeting and Public Comments Received Appendix D: Summary of Public Comments Received via Email and DEP Responses Appendix E: Alley Creek Use Attainability Analysis Appendix F: SPDES Variance Appendix G: Disinfection Approach for Alley Creek CSO Retention Facility LIST OF TABLES Table ES-1. Classifications and Standards Applied ............................................................................. ES-3 Table ES-2. Baseline Compliance with Bacteria Criteria ...................................................................... ES-8 Table ES-3. Compliance with Bacteria Criterion with 100 Percent CSO Loading Removal ................. ES-9 Table ES-4. Alley Creek and Little Neck Bay Alternatives Summary ................................................. ES-10 Table ES-5. Compliance with Bacteria Criterion for the Recommended Alternative .......................... ES-14 Table ES-6. Proposed Site-Specific Bacteria Targets for Alley Creek and Little Neck Bay ............... ES-15 Submittal: June 30, 2014 ii CSO Long Term Control
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