|
HWAAP-B30
BUILDING 101-16 CATCHMENT PIT (BASIN)
SITE DESCRIPTION
HWAAP-B30 is an inactive unlined surface impoundment pit located northwest of Bldg 101-16 and measures 78 by 30 by 6 feet. The impoundment is partially  eroded at the south end. A settling tank is located approximately east of the impoundment at the west side of Bldg 101-16 and appears to be connected to the impoundment by a discharge pipe entering the pit at the southeast corner. Small piles of dredged soils surround the impoundment. This impoundment operated from 1940 to the early 1970's and received large amounts of waste water containing TNT and RDX. Remedial Investigation work in 1994 included water sampling from the settling tank, surface soil and hand auger sampling, and cone penetrometer soundings. Three surface soil samples, three hand auger samples, seven cone penetrometer soil samples and one water sample from the settling tank were collected and analyzed for explosives and metals. The sump water contained elevated levels of VOCs, RDX (240 ppb), 2-Amino-DNT (5.3 ppb), and 4-Amino-DNT (9.8 ppb). Explosives and metals (except beryllium) were detected at low levels in the soil samples taken from surface to a depth of 20' bgs. Stained soils were observed. The site was reassessed in 1999 using improved sampling and analytical techniques; NFA was required.
PROPOSED PLAN
A Closure Document was approved by NDEP on 22 Nov 1999.
Decision Document
 Previous Site Summary  Next Site Summary
IRP Home Page
Table of Contents -- IRP Site Summaries
NDEP - Site Map
|
