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HWAAP-I11
BUILDING 49-9 PIT/LANDFILL
SITE DESCRIPTION
HWAAP-I11 is an open pit landfill used to dispose of paint, paint solvents and their containers. The pit is approximately 40 by 15 by 4 ft. The  period of use of the pit is not well documented. Remedial Investigation work in 1994 included a 0.2 acre magnetometry survey to assess other buried containers; one 50 foot cone penetrometer sounding to define the optimum depth for subsurface sampling; collection of 10 soil gas samples, two surface soil samples and 8 subsurface soil samples from one boring drilled to a maximum depth of 30 feet. No additional buried containers were identified from the magnetometry survey. One soil gas sample collected from within the pit contained a high concentration of VOCs. Both surface and subsurface soil samples contained concentrations of VOCs with elevated concentrations of lead (2500 mg/kg) in the surface soil samples.
Fifty cubic yards of soil that contained high concentrations of lead and chromium were excavated and transported to a lead disposal pit on HWAD. The majority of lead contaminated soil was removed from the pit. The pit was backfilled with clean soil. The excavation cover was hydroseeded to stabilize soil and prevent erosion. No construction should be allowed on the site, the site should be only for industrial use, and the site status should be documented in the Installation Master Plan.
PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in November 2001.
Decision Document
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