The subject site is an approximately
180-acre public park in eastern
Massachusetts that is host to numerous year-round indoor and outdoor activities. About 30 acres are actively used for various sports and recreation, while the majority
of the remaining 150 acres is maintained as undeveloped wooded land. The projects carried out for the site included the design
and construction of a sewer extension and pump station, environmental site assessment and remediation, and preparation of
a maintenance plan.
Sewer Connection/Pump Station
FS
Engineers, Inc. (FSE) brought the public pool located on the site into compliance with local, state, and federal regulations.
The 300 feet by 150 feet, 1.5 million gallon spring-fed, lined pool is an important
aspect of the park operations during the summer months. From June through August, the pool is used by an average of
1,000 people daily. American Red Cross swimming lessons are held at the pool
and hours are set aside for special needs children and senior citizens. FSE was
responsible for preparing design plans for a pump station and sewer line to connect the pool water discharge to the town sewer
system. FSE also obtained the necessary approvals from the municipal
conservation commission and state agencies.
Environmental Assessment and Remediation Plan
FSE conducted an environmental assessment
to delineate arsenic-impacted surficial soils at the park. A comprehensive
surficial soil sampling plan was executed to determine the arsenic-impacted areas. Based
on the field and laboratory analytical results, a Release Abatement Measures (RAM) plan was prepared and implemented to remove
the arsenic-impacted surficial soils from the park. The RAM Plan was designed
to accommodate the continued use of the park by the public during assessment and remediation. FSE was responsible for
preparing a fact sheet, conducting newspaper interviews, and public communications.
FSE also provided contractor management and budget control throughout the site assessment and remediation process.
A
total of 340 tons of arsenic-impacted surficial soil from several areas totaling about two acres was excavated and stockpiled
on site. Confirmatory soil samples were collected from the soil stockpiles and
analyzed to determine disposal options. The soil was transported off-site for
reuse as daily cover. The excavated areas were backfilled with clean loam and
seeded with grass. Site closure documents including a Response Action Outcome
(RAO) with a Method 1 Risk Assessment Statement were filed with the Massachusetts Department of Environmental Protection.
Facility Maintenance Plan
A facility
maintenance plan was prepared by FSE to cover future activities within areas of the park subject to wetland protection
regulations. The plan encompassed certain recurring activities within the
buffer zone of the wetland resource areas following the completion of sewer line and pump station upgrades. These included routine operation and maintenance of a sluice gate, repair of erosion control measures along
a stream, and vegetation control within the wetland buffer zone. The maintenance
plan was submitted to and approved by the municipal conservation commission.
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