Massachusetts Water Resources Authority Frederick A. Laskey Executive Director 20 Years of Change: Boston Harbor Pollution Abatement Project Timelines.

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Presentation transcript:

Massachusetts Water Resources Authority Frederick A. Laskey Executive Director 20 Years of Change: Boston Harbor Pollution Abatement Project Timelines Andrea Rex Outfall Monitoring Science Advisory Panel June 10, 2008

2 Timeline: Starting conditions Two failing primary treatment plants discharged total 350 million gallons/day to harbor. Digested sludge discharged in northern harbor. 84 CSOs discharge 3 billion gallons annually during wet weather 1986 Federal judge ordered schedule to construct new Deer Island Treatment Plant and related facilities.

3 Timeline: Early changes Upgrades old DITP, including improvements to disinfection. Sewage scum land-filled instead of being discharged into the harbor. 1991: End of sludge discharges into the harbor; sludge is made into fertilizer pellets. CSO discharges cut in half to 1.5 BGY

4 Timeline Improved pumping capacity at DITP decreases CSO further, most dramatic in Charles River Start-up of secondary treatment at DITP 1997 Nut Island Treatment Plant flows transferred to DITP. NITP decommissioned 1998, end of discharges to the southern harbor!

5 September 2000 Start-up of new 9.5 mile-long outfall. DITP effluent discharged into Massachusetts Bay End of effluent discharges to Boston Harbor

6 TSS discharges 1998 Nut Island transfer Dec 1991 End of sludg e Sept 2000 offshor e

7 Dec 1991 End of sludg e 1998 Nut Island transfer Sept 2000 offshor e

8

9 After 2000, WWTPs no longer significant source CSO projects 2000 Constitution Beach (Winthrop Bay) CSOs ended. Several CSO hydraulic relief projects. Cottage Farm CSO facility upgrades. Neponset River sewer separation, CSOs closed2001 Dorchester Bay CSO facility upgrades Prison Point (mouth of Charles) facility upgrade Somerville Marginal (mouth of Mystic) upgrade Chelsea Relief Sewer projects

10 CSO Projects 2006 Stony Brook (large discharge to Charles River) sewer separation South Dorchester Bay sewer separation Pleasure Bay storm drain improvements2007 BOS019 CSO storage facility (Charlestown) Union Park Detention and Treatment Facility (Fort Point Channel): Stores 2MG for pump-back, treats remaining overflows Fort Point Channel Sewer Separation and Optimization Decommissioning of South Dorchester Bay CSO facilities (Fox Point and Commercial Point) End of CSO discharges to South Dorchester Bay!

11 Summary: CSO Control Plan

12 Summary: changes in size and location of loadings Pre 1991 Sludge discharge ends New primary facilities DITP 1995 Upgrade to secondary began Inter-island transfer Secondary upgrades continue 2000-present Outfall transfer

13

14 CSO control for South Boston beaches Tunnel to store combined sewage for pump-back to treatment plant