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Record of Decision System (RODS)

OTIS AIR NATIONAL GUARD BASE/CAMP EDWARDS

Abstract

Site Name:  OTIS AIR NATIONAL GUARD BASE/CAMP EDWARDS
Address:  OTIS AFB HERBERT RD 
City & State:  FALMOUTH  MA  02542
County:  BARNSTABLE
 
EPA ID:  MA2570024487
EPA Region:  01
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R01-92/071
ROD Date:  05/20/1992
Operable Unit(s):  02
 
Media:  Ground Water
 
Contaminant:  VOCs
 
Abstract:  SITE HISTORY/DESCRIPTION: The 22,000-acre Otis National Guard/Camp Edwards site is a former military vehicle maintenance facility on Cape Cod, Massachusetts, within the Massachusetts Military Reservation (MMR). The Area of Contamination Chemical Spill Area Number 4 (AOC CS-4) plume extends 11,000 feet and is located 1.1 miles from the southern boundary of MMR. Land use surrounding MMR is predominantly residential and light industrial. Ground water beneath Cape Cod has been classified as a Class I, Sole Source Aquifer under the Safe Drinking Water Act. From 1940 to 1984, the site was used by the Federal Government for various purposes. From 1940 to 1946, the U.S. Army operated the site for maintenance of military vehicles, and from 1955 to 1973, USAF operated the vehicle area. Wastes and equipment handled at AOC CS-4 included oils, solvents, antifreeze, battery electrolytes, paint, and waste fuels. Additionally, the northern portion of AOC CS-4 was used as a storage yard for wastes generated by shops and laboratories operating at MMR. Liquid wastes were stored in containers or underground storage tanks (USTs) in an unbermed area or deposited in USTs designated for motor gasoline. The UST waste storage contents were removed in 1984, and the AOC CS-4 site has been inactive since 1986. Since 1986, the DOD's Installation Restoration Program staff conducted several investigations at MMR, which revealed that ground water was contaminated with VOCs and may migrate off of the MMR to the south. This ROD addresses OU2, the interim action for MMR AOC CS-4 ground water to prevent further down gradient migration of the contaminants. Future RODs will address a final remedy for the AOC CS-4 plume upon completion of the AOC CS-10 ground water plume study, while contaminated soil will be addressed as part of a removal action. The primary contaminants of concern affecting the ground water areVOCs, including PCE and TCE. PERFORMANCE STANDARDS OR GOALS: Chemical- specific clean-up goals for ground water are based on SDWA MCLs and state standards and include PCE 5 ug/l; TCE 5 ug/l; DCE 70 ug/l; and PCA 2 ug/l (10[-6] risk-based standard). INSTITUTIONAL CONTROLS: Not provided.
 
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes onsite pumping and treatment of 790 million gallons of contaminated ground water using carbon adsorption to remove VOCs; monitoring the influent and effluent of the carbon absorption treatment, and discharging the treated water to an onsite infiltration trench; and monitoring ground water. The estimated present worth cost for this remedial action ranges from $2,113,000 to $4,528,000, which includes a present worth O&M cost ranging from $472,000 to $1,012,000 for 5 years.
 
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