Volatile Organic Compounds (VOCs)
- Levels of VOCs in soil vapor included 18 ppm acetone, 0.077 ppm toluene, and 0.031 ppm xylene
- Contaminants in groundwater included 500 ppb TCE, 16,000 ppb DCE, 3.3 ppb chloroform, and 7 ppb bromodichloromethane
Site LF-12 is located at Landfill 4 at Offutt AFB in Nebraska. An estimated 40,000 cubic yards of refuse, waste solvents, and sewage sludge were disposed at Landfill 4, resulting in contamination of soil and groundwater at the site. Low levels of VOCs, including acetone, toluene, and xylene, were detected in the soil vapor. TCE (500 ppb), DCE (16,000 ppb), chloroform (3.3 ppb), and bromodichloromethane (7 ppb) were detected in the groundwater.
A hydraulic containment system was installed at the site, and was operating as of January 1997. Information on the start date for the system was not provided. The system consists of three recovery wells, and operates at an average flow rate of 105 gpm. Groundwater is treated with air stripping and effluent is discharged to a local POTW. Only limited cost and performance data are available for this application. The volume of contaminant removed as of January 1997 was 12.81 gallons. The average concentration of TCE in extracted groundwater was 151 ppb.
The capital cost for the system was $540,000, including design, labor, equipment, materials, and startup. O&M costs average $20,000 per year and include electrical, monitoring, equipment and materials, and operations. No data on actual monthly O&M costs were provided.