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

c. Commission Particle Separators
The Commission evaluates whether installation of particle separators is feasible and
appropriate when designing storm drain capital improvement projects. The total number
of particle separators owned by the Commission currently remains at 15. Information
regarding the various particle separators, including their locations, receiving waters, and
inspection and cleaning dates in 2010 is summarized in Table 3-2. The particle
separators on Fenwood Road and Walter Street were cleaned more frequently to assess
their sediment removal effectiveness.
d. Large Storm Drain and Sewer Programs under BWSC’s CIP
Large cleaning and maintenance jobs are performed by outside contractors under the
Commission’s Capital Improvement Program. The Commission’s three-year Capital
Improvement Program (CIP) is updated annually. The 2010-2012 CIP included $44.1
million for sewer and drain related projects, of which $14.1 million was earmarked for
2010. Highlights of the Commission’s 2010-2012 Capital Improvement Program are
provided below.
Sewer Renewal and Replacement
Renewal and replacement (R/R) projects involve the rehabilitation or replacement of
sewers and storm drains because of structural deterioration, excessive emergency repairs,
and other operation and maintenance problems. The Commission identifies sewer and
drain lines that require renewal or replacement through television inspections, sewer
system evaluation surveys, and routine maintenance activities.
The objectives of the renewal and replacement program are to insure the operability of
sewers and storm drains, protect the structural integrity of the sewer system, reduce longterm
capital and maintenance costs and minimize disruptions of service caused by
sewerage back-ups or other related problems.
The 2010-2012 CIP provided funding for numerous sewer renewal and replacement
projects citywide, including repair or replacement of defective sewer pipes, and
installation of new drains in Back Bay/Beacon Hill, East Boston, Roslindale, Roxbury
and West Roxbury, as well as replacement of a deficient 24-inch sewer in the Savin Hill
area of Dorchester.
Increased Capacity Projects
The Commission continues to make capital investments to increase capacity in some
areas and maximize capacity in other areas. The goals of these projects are to ensure
sufficient hydraulic flow in all areas of the city, reduce long-term maintenance costs,
3 - 4