ROICC Contractor's Area (UST ROICC-8) Petroleum Site
Background
The ROICC Contractor's Area is located north of the runways and downtown Adak in an unpopulated area, approximately 0.5 mile west of Kuluk Bay. ROICC-8 is located on the western edge of the ROICC Contractor's Area. The site had one 1,300-gallon UST (UST ROICC-8), which was removed in 1995. The history and usage of the UST are not documented, but the tank is believed to have been used to collect and store diesel-range and heavier petroleum product (US Navy 1999a). The ROICC Contractor's Area is approximately 3.68 acres.
In 1996, nine monitoring wells and two soil borings were installed at the site. DRO concentrations in the soil ranged from not detected to 801 mg/kg. GRO and BTEX were not detected in the soil. The maximum DRO and GRO concentrations reported in groundwater samples were 500 µg/L and 817 µg/L, respectively, from well 08-153. In addition, benzene was detected at a concentration of 24.8 µg/L in well 08-151.
In 1998, groundwater from wells 08-153 and 08-160 was resampled. Benzene and GRO were detected at concentrations of 1.4 µg/L and 110 µg/L, respectively in well 08-153. Xylenes were detected at levels barely above the detection limit in both wells. No other constituents were reported.
In 1999, these two wells were resampled as part of the limited monitoring program. Analytical results from groundwater samples collected during the first year of comprehensive monitoring were below the Alaska DEC 18 AAC 75.345 Table C values.
Identified Contaminants
Soil analytical data collected from depths of less than 15 feet were compared to Alaska 18 AAC 75 Table B-1 Method 2 values; 6 exceedances of these criteria were noted in data collected from 4 locations (08-152, 08-157, 16, and 17) for at least one of the following analytes: benzene, DRO, and GRO. Most exceedances were located near the former tank area.
Petroleum Institutional Controls
|
|
|
|
Petroleum Engineering Controls
|
