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HWAAP-B27A
BUILDING 103-16 ORDNANCE WASHOUT IMPOUNDMENT (CATCHMENT PIT)
SITE DESCRIPTION
HWAAP-B27A consists of eight inactive unlined surface impoundments and two drainage ditches located northwest of the ordnance washout Building 103-16.  The eight impoundments occupy a total area of 10 acres. Each impoundment is up to 8 feet deep. Two drainage ditches exist at the site. One ditch extends northwest from the facility for approximately one half mile and the second ditch extends southeast of the facility and is branched to the northwest near the impoundments. The impoundments have eroded and are partially filled with windblown sand. There is visible evidence of the several inches of ammonium pricrate and TNT stained soils in the pits and sidewalls. The drainage ditches and the pits have potentially received up to 20,000 gallons of waste water containing ammonium pricrate, RDX, TNT, and red fuming nitric acid between 1946 and 1981. Area groundwater samples collected in 1974 as a part of the USGS Phase II investigation were analyzed and nitrates were detected above 70 ug/l. No significant levels of TNT, RDX or ammonium picrate were detected in the groundwater. No groundwater remediation required.
Remedial investigation work in 1994 included collecting 15 surface soil samples, 14 hand auger samples, and 7 cone penetrometer soil samples from the pits and the ditches and analyzing samples for explosives and metals. Metals and explosives were detected in surface soils in the ditches and in the impoundments. Contaminant concentrations generally decreased with depth. TNT was detected at concentrations of 700 mg/kg and 340 mg/kg in surface samples and then decreased to 71 mg/kg at a depth of 5 feet. Elevated levels of lead (200 mg/kg), beryllium (1.1 mg/kg), cadmium (23 mg/kg), and total chromium (120 mg/kg) were also detected in the surface soils. Additional sampling for ammonium picrate was performed in 2002, and high contaminant levels in the surface soils (within 6-12 inches of the surface) was confirmed.
Aerial Photo (black & white --96KB)
PROPOSED PLAN
Investigation of Pit A soil for explosives was conducted in July 2010. Results of the investigation have not been submitted as of September 2010.
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Aerial Photo