EPA ID# ORD009043001
EPA Region 10
Benton County

4th Congressional District

Other Names:
Last Update: September, 2007

Hide details for Site DescriptionSite Description

The 2-acre United Chrome Products, Inc. site is a former chrome-plating facility located in an industrial complex adjacent to the Corvallis Municipal Airport, 3 miles south of the city of Corvallis. The company conducted electroplating operations from 1956 to 1985. An on-site dry well was used to dispose of floor drippings, washings, and product rinsate collected in a sump within the building. The liquids reportedly were neutralized with sodium hydroxide and/or soda ash prior to disposal. The company conducted electroplating operations from 1956 to 1985. Plating wastes were discharged into a dry well. The indoor plating tanks leaked plating solution directly to subsurface soils. Groundwater, surface water, sediments and on-site soils were contaminated with chromium. Two city wells are located approximately 3,000 feet northeast of the site; however, the City is not using these wells. Contamination previously extended over 2 miles off-site in surface water, and over 1 miles off-site in sediments. Approximately 42,000 people live within 3 miles of the site. The closest residence is approximately 900 feet northeast of the facility. Corvallis obtains some of its water from the Willamette River, which formerly received drainage from ditches and surface water from the site until cleanup measures were implemented.

Site Responsibility: This site is being addressed through federal and responsible parties' actions.

NPL Listing HistoryDates
Proposed Date:09/08/1983
Removed Date:
Withdrawal Date:
Final Date:09/21/1984
Deleted Date:

Hide details for Threats and ContaminantsThreats and Contaminants

Media Affected: Surface Water, Soil & Sludges, Groundwater
Sediments, soils, and surface water were contaminated with chromium. The groundwater is contaminated with chromium. Exposure to contaminants through direct contact with or ingestion of contaminated groundwater, sediments, and soil may have posed a public health threat.

Hide details for Cleanup ProgressCleanup Progress

Early Actions: In 1985, EPA removed 8,000 gallons of chrome-contaminated liquids and 11,000 pounds of hazardous waste off-site for disposal.

Long-Term Actions: After conducting an investigation to determine the nature and extent of contamination at the site, EPA selected a final remedy in September 1986. The remedy was implemented in 1988, which included the installation of a groundwater extraction and treatment system and demolition of buildings. Chromium contamination in groundwater has decreased significantly. In December 1991, EPA issued an Explanation of Significant Differences (ESD) to the 1986 Record of Decision (ROD). The ESD modified the groundwater cleanup levels and included the off-site treatment of extracted groundwater by the publicly owned treatment works (POTW). The city of Corvallis, the owner of the site, signed a Consent Decree in 1992 for partial reimbursement of EPA’s past response costs and for operation of the groundwater extraction system. In 1998, further site characterization for residual chromium deposits revealed the presence of two "hot spots" or zones of highly concentrated chromium-contaminated soil. These areas of residual chromium appeared to be preventing the groundwater cleanup target from being met. In October 2000 the City of Corvallis completed a soil removal action which removed a total of 1,956 tons of chromium-contaminated soil for disposal at a permitted hazardous waste landfill. All soils with chromium concentrations greater than 6,000 mg/Kg (the level determined to be protective of the lower aquifer) were removed. The average concentration in the upper groundwater zone, which is not a potential drinking water source due to low yields, meets the cleanup standard for protection of the lower aquifer. Groundwater extraction ceased in December 2004. Compliance monitoring results indicate that the area where groundwater exceeds the 0.1 mg/L standard in the lower aquifer is limited to the zone immediately beneath the residual contamination in the aquitard. Groundwater monitoring will continue in both the upper zone and lower aquifer to identify any changes or increasing trends in concentrations.

Hide details for Regional ContactsRegional Contacts

SITE MANAGER(S):Maryjane Nearman
E-MAIL ADDRESS:nearman.maryjane.wallace@epa.gov
PHONE NUMBER:206-553-6642
E-MAIL ADDRESSsmith.judy@epa.gov
PHONE NUMBER:503-326-6994
Information pertaining to this site is housed at the following location(s):
Corvallis-Benton County Public Library (Administrative Records)
645 Northwest Monroe Avenue
Corvallis, OR 97330
(503) 757-6926

EPA Region 10 Superfund Records Center (Administrative Records)
1200 Sixth Avenue, ECL-076
Seattle, WA 98101