MWRA BOARD OF DIRECTORS Matthew A. Beaton, Chairman John J. Carroll, Vice-Chair Christopher Cook Joseph C. Foti Kevin L. Cotter Paul E. Flanagan Andrew M. Pappastergion, Secretary Brian Peña Henry F. Vitale John J. Walsh Jennifer L. Wolowicz Prepared under the direction of Frederick A. Laskey, Executive Director David W. Coppes, Chief Operating Officer Stephen A. Estes-Smargiassi, Director, Planning and Sustainability Lisa M. Marx, Senior Program Manager, Planning Carl H. Leone, Senior Program Manager, Planning together with the participation of MWRA staff 2018 MWRA Wastewater System Master Plan December 1, 2018 2018 MWRA Wastewater System Master Plan Table of Contents MWRA MASTER PLAN EXECUTIVE SUMMARY Chapter 1: INTRODUCTION 1.01 Overview of MWRA 1-1 1.02 Purpose of the Wastewater System Master Plan 1-1 1.03 Planning Approach and Time Frame 1-2 1.04 Organization of the Master Plan 1-3 1.05 Periodic Updates 1-3 1.06 MWRA Business Plan 1-3 1.07 Master Plan Priority Ratings for Wastewater System Projects 1-4 Chapter 2: MISSION, GOALS AND OBJECTIVES 2.01 MWRA Mission 2-1 2.02 Wastewater Goals and Objectives 2-1 Chapter 3: HISTORY AND BACKGROUND 3.01 Chapter Summary 3-1 3.02 History of Wastewater Collection and Treatment 3-1 3.03 Growth of the MWRA Sewer Service Area 3-2 3.04 Transition from MDC to MWRA 3-4 3.05 Overview of the MWRA Regional Sewer System 3-5 3.06 MWRA Sewer Expansion Policies 3-6 3.07 Wastewater System Infrastructure Replacement Assets Value 3-7 3.08 Outline of MWRA’s Management Structure 3-8 3.09 Time Line of MWRA Wastewater System Accomplishments 3-9 Chapter 4: WASTEWATER REGULATORY FRAMEWORK 4.01 Chapter Summary 4-1 4.02 NPDES Permitting and Reporting for the DITP and MWRA’s CSO Facilities and Outfalls 4-1 4.03 NPDES Permitting and Reporting for the Clinton Advanced Wastewater Treatment Plant 4-2 4.04 NPDES Stormwater Permitting and Reporting for MWRA Wastewater Facilities 4-3 4.05 NPDES Stormwater Permitting and Reporting for MWRA Water Facilities 4-4 4.06 NPDES Permitting and Reporting for Discharges from the Carroll Water Treatment Plant and Wachusett Aqueduct Pump Station And for Hydroelectric Generating Facilities at Cosgrove and Oakdale 4-4 4.07 NPDES Permitting and Reporting for Pesticide Application at Wachusett Reservoir and Emergency Reservoirs 4-5 4.08 Current and Long-Term Regulatory Issues and Potential Impacts on MWRA 4-5 4.09 Potential Long-Term Regulatory Considerations 4-9 4.10 Interacting With Regulators - MWRA’s Environmental Quality Department 4-10 i 2018 MWRA Wastewater System Master Plan December 1, 2018 Chapter 5: WASTEWATER FLOW AND QUALITY TO THE DEER ISLAND TREATMENT PLANT 5.01 Chapter Summary 5-1 5.02 MWRA Sewer Service Area to DITP 5-2 5.03 NPDES Permit for DITP 5-2 5.04 Review of Wastewater Flow to DITP 5-4 5.05 Potential Future Increase in Sanitary Flow to DITP 5-9 5.06 Potential for Future Wastewater Flow Increases to Impact DITP 5-13 5.07 Review of Wastewater Quality to DITP 5-14 Chapter 6: DEER ISLAND TREATMENT PLANT 6.01 Chapter Summary 6-1 6.02 Facilities Overview 6-6 6.03 Management and Staffing 6-9 6.04 Operation and Maintenance of DITP 6-12 6.05 Pumping and Preliminary Treatment 6-14 6.06 Primary Wastewater Treatment 6-21 6.07 Secondary Wastewater Treatment 6-24 6.08 Disinfection and Dechlorination 6-29 6.09 Outfall Tunnel and Effluent Discharge 6-31 6.10 Residuals Processing 6-33 6.11 Electrical Generation and Distribution 6-40 6.12 Odor Control Facilities 6-50 6.13 Additional Support Systems 6-52 6.14 Summary of Existing and Recommended Capital Projects 6-59 Chapter 7: RESIDUALS PROCESSING AND DISPOSAL (OFF-ISLAND) AT THE PELLET PLANT 7.01 Chapter Summary 7-1 7.02 Residuals Pellet Plant Overview 7-3 7.03 Pellet Plant Contract Operations, Maintenance, and Ongoing Upgrades 7-4 7.04 MWRA Planning For Long-Term Residuals Management 7-5 7.05 Details on Residual Pellet Plant Operations 7-6 7.06 History of Fore River Railroad and Shipyard 7-9 7.07 Summary of Existing and Recommended Capital Projects 7-10 Chapter 8: COLLECTION SYSTEM REMOTE HEADWORKS AND CROSS-HARBOR TUNNELS 8.01 Chapter Summary 8-1 8.02 Facilities Overview 8-4 8.03 Chelsea Creek Headworks 8-9 8.04 Columbus Park Headworks 8-12 8.05 Ward Street Headworks 8-15 8.06 Nut Island Headworks 8-17 8.07 Intermediate Pump Station 8-20 8.08 Winthrop Terminal Headworks 8-20 8.09 Remote Headworks and Cross-Harbor Tunnel Long-term Reinvestment Needs Based on Estimated Replacement Asset Value 8-20 8.10 Boston Main Drainage Tunnel 8-21 8.11 North Metropolitan Relief Tunnel 8-23 8.12 Inter-Island Tunnel 8-23 ii 2018 MWRA Wastewater System Master Plan December 1, 2018 8.13 Braintree-Weymouth Tunnel 8-24 8.14 Summary of Existing and Recommended Capital Projects 8-25 Chapter 9: COLLECTION SYSTEM SEWERS 9.01 Chapter Summary 9-1 9.02 Overview of the Collection System 9-6 9.03 Gravity Sewers 9-13 9.04 Gravity Sewer Interceptor Renewal and Asset Protection 9-19 9.05 Sewer System Capacity and Optimization Projects 9-24 9.06 Gravity Sewer Manholes and Related Structures 9-26 9.07 Siphons and Siphon Headhouse Structures 9-28 9.08 Force Mains and Related Valves 9-32 9.09 CSO and Nut Island Emergency Outfalls 9-34 9.10 SCADA and Wastewater Metering System 9-35 9.11 Summary of Existing and Recommended Capital Projects 9-36 Chapter 10: COLLECTION SYSTEM PUMP STATIONS AND CSO FACILITIES 10.01 Chapter Summary 10-1 10.02 Facilities Overview 10-4 10.03 Alewife Brook Pump Station 10-12 10.04 BOS019 CSO Storage Conduit 10-15 10.05 Braintree/Weymouth Replacement Pump Station 10-16 10.06 Caruso Pump Station 10-18 10.07 Chelsea Screen House 10-20 10.08 Cottage Farm Pumped CSO Facility 10-21 10.09 DeLauri Pump Station 10-23 10.10 Framingham Pump Station 10-25 10.11 Hayes Pump Station 10-27 10.12 Hingham Pump Station 10-29 10.13 Hough’s Neck Pump Station 10-30 10.14 Intermediate Pump Station (IPS) 10-31 10.15 New Neponset Valley Sewer Pump Station 10-33 10.16 North Dorchester Bay CSO Storage and Pump Facilities 10-34 10.17 Prison Point Pump Station and Pumped CSO Facility 10-37 10.18 Quincy Pump Station 10-39 10.19 Somerville Marginal Gravity CSO Facility 10-40 10.20 Squantum Pump Station 10-42 10.21 Union Park CSO Facility 10-44 10.22 Wiggins – Castle Island Terminal Pump Station 10-45 10.23 Braintree Howard Street Pump Station 10-47 10.24 Decommissioned Facilities and Pipeline Easements 10-48 10.25 Reinvestment Needs Based on Estimated Replacement Asset Value 10-49 10.26 Summary of Existing and Recommended Capital Projects 10-50 Chapter 11: COMBINED SEWER OVERFLOW CONTROL PLAN 11.01 Chapter Summary 11-1 11.02 Overview of Combined Sewer Overflow Control Plan 11-2 11.03 CSO Control Plan Projects 11-7 11.04 Ongoing CSO Control Plan Activity 11-21 11.05 Projected Operation and Maintenance Cost Impacts from New Facilities Added Under the CSO Control Plan 11-21 iii 2018 MWRA Wastewater System Master Plan December 1, 2018 11.06 Future Capital Improvement Project Needs for the CSO Control Plan 11-22 11.07 Summary of Existing CSO Control Plan Capital Projects 11-23 Chapter 12: WASTEWATER SUPERVISORY CONTROL AND DATA ACQUISITION (SCADA) AND WASTEWATER METERING SYSTEM 12.01 Chapter Summary 12-1 12.02 SCADA System Overview 12-3 12.03 Wastewater Central Monitoring/SCADA Implementation Projects 12-3 12.04 Wastewater Metering System 12-4 12.05 Summary of Existing and Recommended Capital Projects 12-7 Chapter 13: ENERGY MANAGEMENT, INFORMATION MANAGEMENT, LABORATORY SERVICES, AND SECURITY 13.01 Chapter Summary 13-1 13.02 Energy Management 13-1 13.03 Information Management 13-14 13.04 Laboratory Services 13-18 13.05 Security 13-21 Chapter 14: CLINTON ADVANCED WASTEWATER TREATMENT PLANT 14.01 Chapter Summary 14-1 14.02 Clinton Wastewater Service History 14-2 14.03 Facilities Overview 14-4 14.04 Local Collection Systems 14-7 14.05 MWRA-Owned Collection System 14-7 14.06 Wastewater Flow to the Clinton AWWTP 14-8 14.07 Wastewater Quality at the Clinton AWWTP 14-9 14.08 Clinton AWWTP NPDES Permit 14-10 14.09 Clinton AWWTP Process Operations 14-12 14.10 Summary of Existing and Recommended Capital Projects 14-15 Chapter 15: MWRA FINANCIAL ASSISTANCE FOR COMMUNITY-OWNED COLLECTION SYSTEMS 15.01 Chapter Summary 15-1 15.02 Stormwater and Infiltration/Inflow Impacts on the Regional Collection System 15-2 15.03 MWRA Regional I/I Reduction Plan 15-5 15.04 MassDEP Regulations for Sewer Systems 15-7 15.05 MWRA I/I Local Financial Assistance Program 15-7 15.06 Summary of Existing and Recommended Capital Projects 15-10 Chapter 16: RUTLAND-HOLDEN SEWERS 16.01 Chapter Summary 16-1 16.02 History of the Rutland-Holden Sewers 16-2 16.03 MWRA’s Role in the Rutland-Holden Sewers 16-2 16.04 Overview of the Rutland-Holden Sewers 16-3 16.05 Flow Allocation, Treatment Costs, Operation and Maintenance Costs 16-4 16.06 Special Projects 16-7 16.07 Summary of Existing and Recommended Capital Projects 16-10 APPENDIX iv 2018 MWRA Water and Wastewater System Master Plan December 1, 2018 2018 MWRA Water and Wastewater Master Plan - Executive Summary OVERVIEW Since its inception, MWRA has expended $8.3 billion on capital initiatives (FY86 through FY18).