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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/R01-93/084
ROD Date:  01/04/1993
Operable Unit(s):  07
 
Media:  Soil
 
Contaminant:  VOCs, Other Organics, Metals
 
Abstract:  The 100-acre Otis Air National Guard/Camp Edwards site is an inactive Federal disposal facility located on the 22,000-acre Massachusetts Military Reservation (MMR) within the boundaries of Falmouth, Mashpee, Sandwich, and Bourne, Massachusetts. Land use in the area is predominantly residential and light industrial, with an onsite woodlands area. From the 1940s to 1984, the U.S. Army, Air National Guard, U.S. Air Force, U.S. Navy, Coast Guard, Department of Agriculture Experiment Stations, and the Veterans Administration used the site for unregulated disposal activities. The Area of Contamination (AOC) Main Base Landfill Number 1 (LF-1) Source Area is located on the southern half of the MMR and contains areas of open and heavily wooded terrain. The area consists of six landfill cells, which are designated by the approximate end dates of disposal activity. The 1947, 1951, and 1957 cells occupy approximately 40 acres of the total AOC LF-1 area; while the 1970 Cell, Post-1970 Cell and Kettle Hole landfills occupy approximately 50 acres-the additional 10 acres includes the space that exists between the cells. Solid waste disposal in the Post-1970 Cell ceased in June 1989, and domestic waste disposal at Kettle Hole ceased in 1990. The landfills were covered with soil to minimize the potential for direct exposure to landfilled waste and contaminants. Types of waste disposed of in the landfill cells include general refuse, fuel tank sludge, herbicides, solvents, transformer oils, fire extinguisher fluids, blank small arms ammunition, paints, paint thinners, batteries, DDT powder, hospital waste, municipal sewage sludge, coal ash, and possibly live ordnance. A number of investigations conducted as part of the Department of Defense's Installation Restoration Program, revealed unacceptable concentrations of VOCs, SVOCs, and inorganics in onsite ground water. This ROD addresses an interim remedy for the AOC at Main Base Landfill Number 1 (LF-1), as OU1. Future RODs will address long-term cleanup goals to reduce contaminant concentrations in ground water. The primary contaminants of concern affecting the soil are VOCs, including benzene, TCE, toluene, and xylenes; other organics, including phenols; and metals, including arsenic and lead. SELECTED REMEDIAL ACTION The selected remedial action for this site includes installing a low permeability cover with a passive gas venting system over the 1970 Cell, Post-1970 Cell, and Kettle Hole; regrading and revegetating these areas; implementing a semi-annual ground water monitoring and soil cover inspection program; and implementing site access restrictions such as fencing. The estimated present worth cost for this remedial action ranges from $27,800,000 to $34,800,000, which includes an estimated total present worth O&M cost ranging from $2,000,000 to $2,500,000. PERFORMANCE STANDARDS OR GOALS Institutional Controls: Not applicable.
 
Remedy:  In summary, the interim remedy consists of the following:
. constructing a landfill cover system on the 1970 Cell. Post-1970 Cell, and Kettle Hole
. conducting post-closure maintenance and monitoring of the cover system for a minimum of 30 years after construction is complete
. monitoring landfill gas and groundwater quality semiannually from existing and proposed well locations at AOC LF-1
. reviewing the performance of the remedy every five years after implementation

This operable unit interim remedial action will minimize infiltration and percolation of precipitation through the 1970 Cell, Post-1970 Cell, and Kettle Hole. Selection of a final remedy will depend on the study of the AOC LF-1 groundwater plume and investigation of AOCs downgradient of LF-1. The interim and final remedies proposed must be consistent with the clean-up goals established for the entire MMR site.
 
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