Stage of Clean-up: Construction Underway
Conditions at proposal (October 15, l984): Since 1941, Umatilla Army Depot Activity has occupied about 20,000 acres in northeastern Oregon 6 miles south of the Columbia River in Hermiston, Umatilla County. This NPL site consists of lagoons covering about 0.5 acre. They are contaminated with wastes from explosives as a result of past demilitarization and disposal operations. The major contaminants identified on the base include explosive-derived wastes (RDX, TNT, and nitrate), pesticides (DDT and LINDANE), organic solvents (TETRACHLOROETHYLENE and TRICHLOROETHYLENE), and caustic brine. RDX and nitrates are present in ground water beneath the lagoons. This ground water contamination might affect public water supplies serving about 24 people. The Umatilla Army Depot is participating in the Installation Restoration Program, established in l978. Under this program, the Department of Defense seeks to identify, investigate, and clean up contamination from hazardous materials. More...
Sources of Contamination:
- Explosive disposal/detonation
- Incineration residuals handling
- Lagoon disposal
- Storage - raw material