I-84 & EXIT 178
The Umatilla Army Depot (Lagoons) site occupies about 20,000 acres in Hermiston, Oregon and has operated as a storage depot for conventional munitions and chemical warfare agents since 1941. Areas of the site were contaminated with explosives and metals as a result of past demilitarization and disposal operations. Between the 1950s and 1965, about 85 million gallons of wastewater from explosive washout operations were discharged into two unlined lagoons. The lagoons cover about half an acre. The groundwater contaminant plume is estimated to cover 350 acres, and access to the site is restricted. There are about 100 people living on post, and approximately 900 people live within three miles of the site. The nearest drinking water well is located about 6,500 feet from the disposal area. Commercial agriculture is conducted within the vicinity of the depot, and crops are irrigated with area groundwater. Site Responsibility: This site is being addressed through state and federal actions under a CERCLA federal facilities agreement.
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