Client: USACE Alaska
Location: Goose Bay, Alaska
Completion Year: 2020
- Achieved work objectives with significant change in approach due to changed conditions encountered in the field
- Commended by the COTR in the Interim CPAR: “Contractor exceeding contract requirements in the work plan development, changes in condition, in showing flexibility, stakeholder interaction, difficult logistics and drilling conditions.”
Brice conducted a remedial investigation (RI) at the Acid Storage and Disposal Building (ASB) site located at the Nike Site Bay Formerly Used Defense Site (FUDS) property in Goose Bay, Alaska. The Nike Site Bay facility along with its sister facilities, Nike Site Summit and Nike Site Point, were three Nike-Hercules Missile sites constructed near Anchorage, Alaska in the late 1950s to protect the city and nearby major military installations during the Cold War. Nike Site Bay was operated by the U.S. Army from 1956 to 1979; the facility is now unoccupied.
Nike Site Bay contained a Battery Control Area (BCA) that consisted of radars and a housing and Launch Control Area (LCA) that consisted of two launch buildings, storage bunkers, and support structures, including the ASB. The ASB was a small building that was used to store nitric acid, a component of Nike-Hercules rocket fuel (Jacobs 2013). The LCA portion of Nike Site Bay is now owned by the University of Alaska. A plume of trichloroethylene (TCE) contamination is located at the ASB site and TCE concentrations in soil and groundwater exceed ADEC cleanup levels. The site also contains additional chlorinated VOCs, including tetrachloroethylene (PCE), trans-1,2-dichloroethene, and 1,1-dichloroethene.
The primary goals are to delineate the extent and magnitude of chlorinated volatile organic compound (VOC) contamination in the soil and groundwater at the ASB site and to evaluate the risk associated with chlorinated VOCs; the secondary goal is to delineate additional suspected sources of chlorinated VOC contamination using passive soil gas (PSG) sampling.
To delineate contamination from the ASB source, Brice reviewed historical records, performed field observation and evaluated screening results, and analytical sample results. We also delineated an additional source to the south. For rapid screening of TCE, we used a FROG-4000™ Portable GC PID. However, because the lithology at the site was too dense, and SP16 tooling could not be used obtain groundwater samples without installing permanent monitoring wells. Instead, we installed temporary wells to allow for screening at more limited locations. Site access was challenging requiring us to take an alternative route using ATV trails.
From passive gas sampling (PSG), Brice successfully identified four additional sources of chlorinated VOC contamination at other areas of the site. However, many PSG samplers had to be replaced due to vandalism. Brice recommended additional investigation of these four additional source areas. The risk associated with chlorinated VOCs will be determined based on the extent of contamination, the geology at the site that may hinder or enable the spread of contamination, and the completion of a conceptual site model.