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HWAAP-I15
BUILDING 101-42 CATCHMENT PIT
SITE DESCRIPTION
HWAAP-I15 is a site with two catchment pits reportedly used to contain explosive contaminated waste water from Building 101-42. The two pits are connected by a pipe buried in a low weir. The upper and lower pits are 70 by 45 feet and 120 by 70 feet respectively. The operating period of the building was from 1940 to the early 1970's. Remedial Investigation in 1994 included line locating to determine the pathway of the contaminated waste water from the building to the pits. Data collection included 20 soil gas samples, 12 surface soil samples and 1 cone penetrometer sounding to assess the optimal depth to collect subsurface soil samples. No subsurface soil samples were collected. The surface soil samples were found to contain up to 1500 mg/kg of explosives. The soil from this site was combined with the soil from B20 in a pilot study of windrow composting. The soil was remediated and the pits were backfilled with clean soil. The RA was completed in 1997.
PROPOSED PLAN
A Closure Decision Document  was approved by the NDEP in August 2000.
The site was reopened in August 2008 due to the discovery of TCE contamination in groundwater during the investigation of SWMU B20. The source of the groundwater contamination discovered at SWMU B20 was determined to be SWMU I15; therefore, SWMU B20 was closed and SWMU I15 was reopened for further investigation of groundwater contamination.
Reopening Letter August 2008
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