This fact sheet provides information on the Impact Area Groundwater Study Program's Rapid Response Action Plans for a cleanup action at the former open detonation site known as Demolition Area 2. This action is scheduled to begin in spring 2004. The draft plans can be found at the Impact Area Groundwater Study Program's Web site and at the libraries listed below.
The Impact Area Groundwater Study Program, which is managed by the U.S. Army Environmental Center, is conducting an investigation into groundwater contamination at Camp Edwards on the Massachusetts Military Reservation. Working under U.S. Environmental Protection Agency (EPA) administrative orders and in cooperation with the Massachusetts Department of Environmental Protection (MassDEP), the Impact Area Groundwater Study Program is committed to investigating and cleaning up contamination in soil and groundwater on, or emanating from, the base.
Information Repositories have been established in four local libraries. The repositories are updated regularly to ensure that all necessary documents associated with the cleanup program (including copies of workplans, sampling results, site reports, fact sheets, meeting minutes, and other materials) are available to the public.
The Draft Demolition Area 2 Soil Berm Rapid Response Action Work Plan as well as fact sheets on contaminants of concern, including RDX and HMX is available at these locations and on our Web site.
For More Information
Contact the following individuals for more information:
March 2004 Fact Sheet 2004-01
Demolition Area 2 is located on the northern portion of Camp Edwards, approximately 1.5 miles from the base's northern boundary with Sandwich. The 8-acre site was used from the late 1970s to the late 1980s as a demolition area. Records show explosive charges, including TNT and the compound explosive, C-4 (in quantities of less than 10 lbs.) were used at Demolition Area 2.
Demolition Area 2 consists of a clearing with a relatively shallow natural depression. The terrain is elevated to the north and east and densely vegetated outside of the clearing. A berm, comprised of a series of small soil piles is located just beyond the tree line on the western edge of the clearing.
Investigations to analyze contamination at Demolition Area 2 have included soil samples at approximately 40 locations and the installation of 8 groundwater-monitoring wells. The explosive chemicals RDX and HMX are the primary contaminants of concern at this site and have been detected in soil and groundwater. Perchlorate has not been detected in the soil or groundwater at Demolition Area 2.
This fact sheet describes a Rapid Response Action planned to address soil contamination at two locations on the Demolition Area 2 site.
Soil Rapid Response Action Work Plan
The Demolition Area 2 Soil Rapid Response Action Work Plan proposes the removal of contaminated soil that is a potential source of groundwater contamination. The areas where soil will be removed include a man-made berm and a 30-foot area at the center of the Demolition Area 2 site.
Detectable concentrations of explosives chemicals including RDX, HMX and 2A- and 4A-DNTs have been found in soils collected from the "U"-shaped berm on the western edge of the Demolition Area 2 clearing. The presence of these chemicals is consistent with the types of explosives used in past Demolition Area 2 activities. The configuration of the soil berm, combined with the presence of explosive residue and metal debris (fence and wire) presumed to be from previous demolition activities, indicate that materials scraped from the surface of the demolition area during range maintenance activities created the berm.
The proposed Rapid Response Action calls for the excavation and removal of the berm. Although not all soil samples collected from the berm contained measurable amounts of explosives chemicals, the proposal calls for all of the berm to be removed since it is cost effective to do so.
30-Foot Area Removal
The explosives chemicals RDX, HMX and 2A- and 4A-DNTs also have been found in soils collected from a 30-foot area of soil located at the center of the Demolition Area 2 site in the vicinity of the groundwater monitoring well known as MW-16.
Treatment & Follow Up
The two proposed excavations at Demolition Area 2 would remove an estimated 825 tons of soil. This soil removal action is expected to reduce contamination that may be a continuing source of groundwater contamination. Following excavation, the proposal calls for the soil to be treated on-site, using the Thermal Desorption unit at Demolition Area 1, or disposed of at a licensed off-site location.
Post-excavation sampling will be conducted in order to document conditions after the cleanup.
Investigations at Demolition Area 2 will continue and the need for any additional cleanup activities will be evaluated during that process.
The Draft Demolition Area 2 Soil Berm Rapid Response Action Work Plan proposes the following activities:
Next Steps/Upcoming Activities
Next steps toward conducting the Rapid Response Action for soil at Demolition Area 2 include:
Opportunities for Public Comment
A 15-day public comment period will be held on the Draft Demolition Area 2 Soil Rapid Response Action Work Plan from March 23 - April 6, 2004. Visit the IAGWSP website to submit comments.
Details of the plan will be presented at the Impact Area Review Team Meeting on Tuesday, March 23, 2004, from 6 to 9 p.m. at the Holiday Inn - Cape Cod, 291 Jones Road in Falmouth.