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

NDBST and to Deer Island to be treated, while stormwater flows generated from very
large storms will be directed to the MBDC. This will allow for the elimination of outfall
18L087 located near Mother’s Rest in 2011.
a. Storm Drain and Sewer Maintenance by BWSC Staff
The Commission’s Operations Division is responsible for smaller sewer and drain related
repair, maintenance and cleaning jobs, as well as some television inspections of sewers
and drains. In 2010, the Commission jetted, vactored or rodded 631,506 linear feet of
pipe.
In 2010, the Commission owned five (5) “vactor” high-pressure cleaning trucks to clean
accumulated materials from sewers and drains, six (6) jet trucks, one (1) multi-rodder
truck, and two (2) hydraulic bucket machines to clear blockages. To determine where
structural deficiencies exist and where repairs are needed, the Commission crews
performed television inspections of 26,790 linear feet of sewer and drain pipe in 2010.
In conjunction with the storm drain and catch basin cleaning programs, the Commission
routinely clears debris from eleven (11) brook inlets and outlets throughout the City.
Since the primary purpose of this practice is to prevent upstream flooding, the cleaning is
typically performed immediately prior to major storm events and usually they are
checked after storm events to determine if follow up cleaning is needed. The locations
and frequency of cleaning is provided in Table 3 – 1.
b. Catch Basin Maintenance
The Commission has approximately 31,752 catch basins in its sewer and drainage
systems. Other catch basins in the city are owned by other public agencies such as the
state Department of Conservation and Recreation, Mass Department of Transportation, or
are located on private property.
The Commission currently owns six (6) clamshell trucks. Commission forces have been
supplemented by contract forces and equipment since 2001. Under the current citywide
catch basin cleaning contract the contractor is instructed to inspect all Commission
owned catch basins, and clean any basin containing at least two feet of sediment.
Contractors typically complete two passes through the city each year cleaning basins as
directed by the Commission.
In 2010, Commission and contract forces performed 11,483 catch basin cleanings. Catch
basin cleanings are currently transported to the Materials Handling Facility on Alford
Street, where they are temporarily stored until transferred to an approved landfill. An
estimated 7,451 tons of material taken from sewers, drains and catch basins was
transferred by the Commission’s contractor in 2010. It is not known how much of the
material transported was just from the catch basins, although it is believed to be a
majority of the amount.
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