2010 Stormwater Management Report (PDF) - US Environmental ...

minimize the frequency and volume of CSO discharges, and maintain the structural
integrity of the wastewater collection system.
Increased capacity projects funded in 2010 included sediment removal from 6 large
intercepting sewers, cleaning and repair of structural damage to CSO outfall 065, and
cleaning of outfall 010 in East Boston.
Sewer Separation
The primary purpose of sewer separation is to reduce the frequency and volume of wet
weather CSO discharges. The Commission’s separation program involves the conversion
of combined sewer systems to separate sanitary sewer and storm drain systems.
Typically, separation is achieved by converting the combined sewer to a sanitary sewer
and installing a new storm drain.
The 2010-2012 CIP provided funding for the design and construction of numerous sewer
separation projects, including major CSO sewer separation projects in East Boston,
Dudley Square and at Bullfinch Triangle. Funding was also provided to relocate the
regulator on the Dorchester Brook Sewer, and preliminary design for sewer separation in
Roxbury. Included in this category of CIP funding is the Citywide Illegal Connection
Investigation program, correction of illegal connections by a Commission contractor, and
the Commission’s ejector pump program for reimbursing homeowners for the correction
of illegal connections on their properties.
I/I Reduction Program
The 2010-2012 CIP included funding to decrease the amounts of infiltration and inflow
entering the sewer system. Removal of I/I retains and restores the capacity of the sewer
system and helps prevent sewer overflows. The 2010-2012 CIP included funding to
disconnect downspouts connected to combined and sanitary sewers in Jamaica Plain,
Dorchester, Neponset, Ward Street, Allston/Brighton, West Roxbury, Roslindale, South
Boston and Hyde Park. Included in this category of funding was installation and upgrade
of the Commission’s rain gauges.
Sewer/Drain Special Projects
The Sewer System Special Projects category of capital funding provides for a variety of
system planning and other studies, and for professional services relating to the
rehabilitation and operation of the sewer and drainage systems. Major projects funded
under the special projects category included development of a Wastewater/Drainage
Facilities Plan and an NPDES Stormwater Monitoring Program.
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