SSES Implementa=on and SSES Pilot Study Program
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1 SSES Implementa=on and SSES Pilot Study Program Large- Scale Rehabilita=on in Mul=ple Towns Jason F. Waterbury, P.E. The Metropolitan District 555 Main Street HarOord, CT Katelyn M. Biedron, P.E. John A. Harper, Jr., P.E. Joseph L. Laliberte, P.E. CDM Smith 670 N. Commercial Street Manchester, NH NEWEA Annual Conference 2015 January 27, 2015
2 Presenta=on Overview Introduc=on MDC Clean Water Project SSO Program SSES Implementa=on SSES Pilot Study Lessons Learned
3 Introduc=on The MDC is a nonprofit municipal corpora=on chartered by the Connec=cut General Assembly in 1929 Our mission is to provide our customers with safe, pure drinking water, environmentally protec=ve wastewater collec=on and treatment and other services that benefit the member towns We provide water, sewer and household hazardous waste collec=on to its member towns and treated water to por=ons of non- member towns
4 Clean Water Project 2006 Consent Decree/2007 Consent Order by USEPA and CTDEEP Main Goals Eliminate Sanitary Sewer Overflows (SSO) Reduce the amount of combined sewage that enters the CT River Reduce the amount of Nitrogen released into the CT River Clean Water Project Components WPCF Improvements Sewer Separa=on Storage and Conveyance Tunnels Relief and Consolida=on Pipe Inflow and Infiltra=on (I/I) Reduc=on
5 SSO Program Overview Sewer System Evalua=on Studies (SSES) Ini=al SSES Implementa=on Projects Contracts , , and Contract , and Contracts , , and Modeling and Capacity Assessments Addi=onal SSES Implementa=on Projects SSO Elimina=on Plans (2010) Approved by EPA January 4, 2013 Eliminate Structural SSOs: 25- year Level of Service Eliminate Manhole Flooding: 10- year Level of Service Eliminate Sewer Backups: 5- year Level of Service Assumed 10% I/I Reduc/on
6 SSO Program Evolu=on SSES Implementa=on Contracts SSO Elimina=on Plans SSES Pilot Study SSO Elimina=on Master Plan Future Project Implementa=on
7 Toilet Back Up Manhole Surcharge Sewer Main Defect Sanitary Sewer Overflow NEWEA Annual Conference 2015
8 SSES Implementa=on Scope of Work Sewer Mains and Laterals Segment Replacement Point Repairs Cured- in- Place Pipe (CIPP) Lining CIPP Short Liners Lateral Repairs and CIPP Lining Manholes Frame and Cover Replacement Cemen==ous Lining Internal Chimney Lining Dead End Manholes
9 Design Drawings
10 Addi=onal SSES Implementa=on Contracts Contract Town Construc/on Cost Point Repairs (Ea) Segment Replacement (LF) CIPP Lining (LF) F&C Replacement (Ea) Lined Manholes (ea) A West HarOord $ 2.7 M 40 1, Newington $ 5.0 M 1-66, A 2014B- 22 Rocky Hill & Wethersfield Rocky Hill & Wethersfield $ 7.9 M 1-58, $ 8.0 M 2 1,850 29, Windsor $ 8.4 M 7 1,434 14, West HarOord $ 15.0 M 12 1, , XX West HarOord $ 7.0 M 12 2,500 70, Totals $ 54.0 M 81 9, ,
11 SSES Implementa=on Lessons Learned Field Inves=ga=ons Survey and Borings Closed- Circuit Television Inspec=on (CCTV) All Dig Loca=ons Verify Any Completed/Exis=ng Repairs Manhole Inspec=ons Verify Depth of Manhole Corbel Dimensions for Frame and Cover Sizing Access Agreements Resident Coordina=on Permiing Use Maintenance Approach
12 SSES Implementa=on Totals Town Sewer Main Lining (LF) % Total Pipe Lined % Total Non- Plas/c Pipe Lined Pipe Replaced (LF) Point Repairs (Ea) Manhole Lining (Ea) Manhole Sealing (Ea) F&C Replaced (Ea) Newington 161,419 29% 39% 1, West HarOord 503,112 50% 65% 16, ,617 Windsor 117,999 31% 47% 1, Wethersfield 169,122 35% 71% 2, Rocky Hill 22,031 8% 10% Totals 973,683 31% 52% 22, , ,364
13 SSES Pilot Study Validate 10% I/I Reduc=on Develop Toolbox of Rehabilita=on Techniques Cost Effec=ve Capacity Solu=ons Key Aspects Field Inves=ga=ons Flow Monitoring Design and Construc=on Data, Reduc=on and Cost Analyses Summary Report
14 SSES Pilot Study Areas Project Areas Newington N6 West HarOord WH8, WH9N- S, WH29, WH34 Wethersfield FB2, FB3, RH2AN- S Windsor WI3A, WI SSES Implementa=on Areas 7 Pilot Study Areas 2 Control Areas
15 SSES Pilot Study Implementa=on and Results Windsor WI3A $2.14M Private I/I Removal 55 Sump Pumps/Pits 1,700 LF of Storm Drain 2,100 LF of Collector Drain 1,800 LF of Drain Service 4,174 LF CIPP (26%) 20 Lined Manholes (25%) 29 F&C (36%) West HarOord WH8 $1.11M Comprehensive Manhole Lining 110 Lined Manholes (96%) 14,417 LF CIPP (59%) 63 F&C (55%) West HarOord WH34 $2.51M Comprehensive Mainline Rehabilita=on 27,647 LF CIPP (89%) 130 Lined Manholes (98%) 500 Top Hats (96%) 68 F&C (51%) RDII 53% Reduc=on No Reduc=on 30% Reduc=on RDII GWI 1% Reduc)on 62% Reduc)on No Reduc)on GWI
16 SSES Pilot Study Implementa=on and Results Wethersfield FB2 $2.91M Private I/I Removal 40 Sump Pumps/Pits 1,620 LF of Storm Drain 1,200 LF of Collector Drain 1,600 LF of Drain Service 6,820 LF CIPP (33%) 15 Manholes Lined (17%) 30 F&C (34%) Wethersfield RH2A South $3.07M Full Lateral Rehabilita=on w/ Cleanout 202 Laterals 11,130 LF Lateral CIPP 6,957 LF CIPP (73%) 3 Manholes Lined (7%) 21 F&C (47%) Wethersfield RH2A North $6.79M Lateral Replacement to Property Line 240 Laterals 6,500 LF Replacement 3,600 LF Lateral CIPP 17,188 LF CIPP (96%) 10 Manholes Lined (13%) 36 F&C (46%) RDII 3% Reduc=on 40% Reduc=on 51% Reduc=on RDII GWI 20% Reduc)on No Reduc)on 55% Reduc)on GWI
17 SSES Pilot Study Implementa=on and Results West HarOord WH9 South $1.65M Lateral Rehabilita=on to Property Line 191 Laterals 7,000 LF Lateral CIPP 10,156 LF CIPP (76%) 1 Manhole Lined (2%) 25 F&C (37%) SSES Implementa=on Only 0-40% RDII Reduc=on (WH9N, N6, WI ) FB3 Control No RDII Reduc=on 100% GWI Increase WH29 Control 8% RDII Reduc=on 68% GWI Increase Four Mile Road Project $6.00M Comprehensive Relief (Non- Pilot) 4,000 LF Sewer Replacement 1,000 LF Lateral Replacement 1,200 LF Lateral CIPP 50 Sump Pumps/Pits 2,500 LF of Collector Drain 2,600 LF of Drain Service RDII No Reduc=on 25% Reduc=on RDII GWI 30% Reduc)on 23% Reduc)on GWI
18 ~66 MGD ~51 MGD
19 SSES Pilot Study Lessons Learned Comprehensive vs. Focused Approach Public and Private Piecemeal Approach = Inconclusive Results Water Migrates! System Wide Standards are Challenging Each Town/Area/Street/House is variable Antecedent Moisture Condi=ons Pre- Inves=ga=on Assump=ons Accurate and Applicable Data Analysis Complete Cost Effec=ve Analysis and Pilot Study Report Complete SSO Elimina=on Plan Updates
20 Thank You!! Ques=ons?
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