DRAFT TABLE OF CONTENTS

Transcription

1 SECTION TABLE OF CONTENTS EXECUTIVE SUMMARY...ES-1 1. Introduction Project Study Area Past Wastewater Planning In Study Area Point-O-Woods Sewer System Old Colony Beach Club Association and Old Lyme Shores Beach Club Association Town s 2012 Preliminary Study Miami Beach Wastewater Facilities Plan Summary Current Regulatory Framework Long Island Sound Nitrogen Consent Orders Local Septic Regulations Project Goals Scope of Work Wastewater Management Needs Analysis Project Sub-Areas Criteria Impacting On-Site Systems Summary of Wastewater Management Needs High Needs Wastewater Service Area Current and Future Flow Projections Assumptions for Flow Calculations Average Annual Flow Projections Seasonal Flow Variations Overview of Local and Regional Alternatives Overview Wastewater Management Overview Local Alternative Regional Alternative Collection System Alternatives Overview Collection System Terminology Gravity Sewer Low Pressure Sewer Septic Tank Effluent Gravity Sewer Septic Tank Effluent Pump Sewer Vacuum Sewer Collection System Alternative in High-Needs Sub-Areas Gravity Alternative Low Pressure Alternative Septic Tank Effluent Gravity Alternative Septic Tank Effluent Pump Alternative Town of Old Lyme (226617) i Woodard & Curran

2 5.3.5 Vacuum Alternative Common Sewer Infrastructure Local Alternative Common Sewer Regional Alternative Common Sewer Annual O&M Costs Regional Alternative Sewer System Configurations Downstream Sewers in East Lyme and Waterford Cost Comparison Treatment Alternatives Introduction Overview of Local Treatment Alternatives Treatment Configurations Local WPCF Collection System Impacts on Treatment System and Costs Regional Treatment Alternative Cost Comparison Disposal and Reuse Alternatives Overview of Local Disposal and Reuse Alternatives Local Subsurface Investigations Test Pitting Cherrystone Soil Borings and Groundwater Wells Cherrystone and Black Hall Seasonal High Water Table Black Hall and Cherrystone Aquifer Testing Black Hall and Cherrystone Monitoring Well Survey and Groundwater Flow Delineation of Facility Groundwater Model Cherrystone Summary of Local Disposal and Reuse Alternatives Sub-Surface Disposal at the Cherrystone Site Reuse at the Black Hall Site Sub-Surface Disposal at Black Hall Site Local Disposal & Reuse Costs Anticipated Permits and Requests of CT-DEEP Ground Water Discharge Permitting Wastewater Reuse Permitting Requests of CT-DEEP Comparison of Alternatives and RecommEndations Introduction Comparison of Alternatives Capital Costs Annual Operation & Maintenance Costs Total Annual Costs and Financing Options Other Considerations Recommended Plan Proposed Alternative Coordination with Other Beach Communities Implementation Plan Town of Old Lyme (226617) ii Woodard & Curran

3 LIST OF TABLES TABLE Table 2-1: Project Study Area and Needs Ranking Table 2-2: High-Needs Wastewater Service Area Table 3-1: Summary of Gravity Wastewater Service Flows Table 3-2: Summary of LPS Wastewater Service Flows Table 5-1: Capital Costs for Gravity Sewer Alternative Table 5-2: Capital Costs for Low Pressure Sewer Alternative Table 5-3: Capital Costs for STEG Sewer Alternative Table 5-4: Capital Costs for STEP Sewer Alternative Table 5-5: Capital Costs for Common Sewer for Local Alternative Table 5-6: Capital Costs for Common Sewer for Regional Alternative Table 5-7: Annual O&M Costs for All Collection System Alternatives Table 5-8: Downstream Pump Station Capacities (Regional Alternative) Table 5-9: Estimated Downstream Capital Needs (Regional Alternative) Table 5-10: Wastewater Service Area Capital Collection Costs Table 5-11: Total Capital and Annual Collection Costs Table 6-1: Summary of Local Treatment Costs for Different Collection System Options Table 6-2: Regional Capital Cost Summary Table 6-3: Treatment Cost Summary Table 6-4: Annual Treatment Costs Table 8-1: Capital Cost Summary Table 8-2: Annual O&M Cost Summary Table 8-3: Total Annualized Costs (0% Grant, 4% Loan) Table 8-4: Total Annualized Costs (0% Grant, 2% Loan) Table 8-5: Total Annualized Costs (25% Grant, 2% Loan) APPENDIX B Table B-1: Summary of Subsurface Exploration Table B-2: Seasonal High Water Table Calculations Cherrystone Table B-3: Summary of Hydraulic Conductivity Town of Old Lyme (226617) iii Woodard & Curran

4 FIGURE LIST OF FIGURES Figure 1-1: Project Study Area Figure 2-1: Project Sub-Areas Figure 2-2: Prioritization of Wastewater Management Needs Figure 2-4: Lot Size Distribution for High-Needs Wastewater Service Area Figure 2-3: High-Needs Wastewater Service Area Figure 3-1: Flow Projections for Wastewater Service Area Figure 3-2: Anticipated Annual Flow Variations for Wastewater Service Area Figure 4-1: Local Alternative Stick Diagram Figure 4-2: Regional Alternative Stick Diagram Figure 4-3: Summary of Local and Regional Alternatives Figure 5-1: Gravity Sewer System Overview Figure 5-2: Low Pressure Sewer System Overview Figure 5-3: STEG/STEP Sewer System Overview Figure 5-4: Vacuum Sewer System Overview Figure 5-5: Common Sewer for Local and Regional Alternative Figure 5-6: Common Sewer for East Lyme and Waterford for Regional Alternative Figure 6-1: Potential Wastewater Treatment Facility Sites for Local Alternative Figure 7-2: Anticipated Year-Round Flows Figure 7-1: Anticipated Disposal and Reuse Flow Needs Figure 7-3: Year Round Flows vs. Primary Subsurface Disposal Figure 7-4: Year Round Flows vs. Primary Subsurface Disposal and Black Hall Reuse Figure 7-5: Year Round Disposal and Reuse Figure 8-1: Recommended Plan (Local Alternative) APPENDIX B Figure B-1: Figure B-2: Figure B-3: Figure B-4: Figure B-5: Figure B-6: Figure B-7: Site Plan Subsurface Cherrystone Subsurface Black Hall Slug Test Analysis: WC-2 Groundwater CherryStone Groundwater Black Hall SAS Facility - Cherrystone Town of Old Lyme (226617) iv Woodard & Curran

5 APPENDICES Appendix A: Appendix B: Appendix C: Consent Orders Subsurface Investigation (Figures & Tables) Subsurface Investigation - Groundwater Data and Boring Logs Town of Old Lyme (226617) v Woodard & Curran