Sierra Army Depot, Lassen County, California: Final Record of Decision/Remedial Action Plan, Seven Sites.
Abstract
The TNT Leaching Beds Area actually consists of two subsites: TNT Leaching Beds Subsite and Paint Shop Subsite. The TNT Leaching Beds Subsite is composed of two unlined depressions or leaching beds approximately 50 feet by 100 feet and 50 feet by 50 feet, respectively. These beds were used in conjunction with a shell washout facility that operated from the early 1940s to 1949, when it was demolished. Water, containing explosive compounds, flowed through a concrete-lined trough to the unlined beds where it infiltrated into the soil. Investigations conducted as part of the U.S. Army Installation Restoration Program (IRP) determined that soil and groundwater at the TNT Leaching Beds Subsite are contaminated with explosives. The Paint Shop Subsite consists of the area surrounding a concrete pad that was formerly an ammunition renovation area. A cement-lined trough extends eastward from the concrete pad towards a depression that was a drywell or settling pond. Wastewater suspected to be mixed intermittently with solvents was washed down sink and floor drains at the facility through the concrete trough and into the drywell or settling pond. laboratory analyses indicate that soil at the Paint Shop Subsite is contaminated with volatile organic compounds (VOCs) and semivolatile organic compounds (SVOCs) and groundwater is contaminated with VOCs, primarily trichloroethene (TCE).
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1995
- Accession Number
- ADA348759