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Record of Decision System (RODS)



City & State:  FALMOUTH  MA  02542
EPA ID:  MA2570024487
EPA Region:  01
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R01-95/115
ROD Date:  09/25/1995
Operable Unit(s):  01
Media:  groundwater
Contaminant:  Trichloroethylene, 1,1,1-trichloroethane
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

Otis Air National Guard, Massachusetts Military Reservation (MMR) occupies approximately 22,000 acres and consists of several operating commands units. The Air Force managed the base until the end of 1973 when base management was transferred to the Air National Guard.

MMR has a year-round population of approximately 2,000 people, with an additional 800 nonresident employees. Year-round residents live in a housing area operated by the Coast Guard. Intermittent use of the area for Reserve and National Guard activities increases the MMR population by as many as several thousand people. Both year-round and seasonal residents live in the towns adjacent to MMR.

Past releases of hazardous materials at the MMR have resulted in groundwater contamination in a number of areas. Documented sources of contamination include motor pools, landfills, fire training areas and drainage structures such as dry wells. Nine major plumes of groundwater contamination have been found to be migrating from these source areas and have been defined during extensive groundwater investigations. Recent field investigations have identified the presence of a tenth plume emanating from a fuel dump valve test site. Seven of the nine plumes have migrated beyond the MMR facility boundary. Extraction and treatment of groundwater has already been initiated for the purpose of containing one plume in order to manage the migration of contaminants and prevent further pollution of downgradient areas and an operating municipal well in the town of Falmouth.
Remedy:  The interim remedy consists of the following: extracting contaminated groundwater at the leading edge of the seven plumes and potentially extracting groundwater from hot spot areas identified during remedial design; conveying the extracted groundwater to a treatment system to remove contaminants; discharging the treated water back to the groundwater and/or other beneficial use; installing monitoring wells, measuring water levels, and sampling groundwater to monitor the performance of the extraction system; monitoring the influent and effluent of the treatment system; restricting groundwater use within the areas contained through imposition of institutional controls; and conducting a review after five years of operation to ensure the remedy provides adequate protection of human health and environment.
Text:  View full-text ROD [ 85K ]
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