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Pacific Southwest, Region 9: Superfund

Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations

Celtor Chemical Works

EPA #: CAD980638860

State: California(CA)

County: Humboldt

City: Hoopa

Congressional District: 01

Other Names: Hoopa Valley Indian Reservation

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Description and History

NPL Listing History

NPL Status: Final

Proposed Date: 12/30/82

Final Date: 09/08/83

Deleted Date: 09/30/03

The 3.2-acre Celtor Chemical Works site, located in the northern Hoopa Valley Indian Reservation, is a former ore concentrating facility that processed sulfide ore for copper, zinc, and precious metal extraction. The Hoopa Valley Indian Tribe, the site's owner, leased the land in 1958 to the Celtor Chemical Corporation. From 1958 until 1962, copper, zinc, and precious metals were recovered on site from sulfide ore mined and trucked to Celtor from the nearby Copper Bluff Mine. In 1962, Celtor Chemical Corporation abandoned the site and mine tailings generated from the milling operations were left on site. These tailings, along with non-specific releases of processed ore, were thought to be the cause of the acidic surface water runoff and elevated metals concentrations in the soils throughout the site. The site consists of the plant, an adjacent pasture used for grazing livestock, a gully connecting the plant and the Trinity River, a drainage creek that collects surface runoff and carries it into the Trinity River, and a fishing access road that is frequently used by local residents. There are approximately 200 people living within one mile of the site. The Trinity River, which supports the only fish resources for the Hoopa Indians, flows through the center of the reservation and near the site.

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Contaminants and Risks

Contaminated Media
  • Soil and Sludges

Soil was contaminated with heavy metals including arsenic, copper, lead, cadmium, and zinc. Potential health threats to people included accidental ingestion or inhalation of contaminated soil and dust generated by wind.

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Who is Involved

This site was addressed through Federal actions.

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Investigation and Cleanup Activities

Initial Actions

Immediate Actions: In 1983, the EPA conducted a focused feasibility study. After a public comment period, EPA signed a Record of Decision on October 4, 1983 to conduct a time critical removal action. By December, 1983, EPA had excavated 1400 cubic yards of visibly contaminated materials. This material included tailings, non-concrete structures, and a portion of the pasture adjacent to the site. The main portion of the site was fenced, and the access road was covered with gravel. The flow of several springs was diverted away from the contaminated areas and into a nearby creek, which emptied into the Trinity River. During this cleanup action, additional contamination was discovered in locations not previously identified, so EPA conducted a more detailed investigation.

Cleanup Complete

Entire Site: On September 30, 1985, EPA signed a Record of Decision that selected a more complete remedy to clean up the Celtor Chemical Works site. From October 1987 to the final off-site shipment in October 1988, the EPA excavated an additional 1,200 cubic yards of contaminated material from the site and disposed of them off site at an EPA-approved hazardous waste disposal facility. Backfilling, contouring of the land and revegetation activities were also completed in 1988 followed by a one-year post remedial maintenance period.

Cleanup Complete

To ensure that cleanup actions remained protective of human health and the environment, EPA conducted five-year reviews published on September 30, 1993 and August 29, 2001. To resolve some uncertainties identified in the review and address community concerns, EPA took samples of site soils in May, 2003. A total of 38 soil samples and five surface water samples were taken to ensure that no contaminants of concern remained on the site above cleanup goals. Sample results confirmed that the site was free of contaminants above cleanup goals. Therefore, EPA concluded that the soils do not pose an unacceptable health hazard for residential or unrestricted land use. In 2006, EPA scientists formally certified that the entire site is ready for unrestricted reuse.

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Cleanup Results to Date

The EPA has completed all actions for the cleanup of contamination at the Celtor Chemical Works site. The EPA, in conjunction with the State and Tribe, determined that the site meets human health and environmental goals.


The site no longer poses a threat to human health or the environment. The site was deleted from the NPL on September 30, 2003.

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Potentially Responsible Parties


Potentially responsible parties (PRPs) refers to companies that are potentially responsible for generating, transporting, or disposing of the hazardous waste found at the site.


Online information about the PRPs for the site is not yet available.

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Documents and Reports


Show details for Fact SheetsFact Sheets
Show details for ImagesImages
Show details for Records of DecisionRecords of Decision
Show details for Technical DocumentsTechnical Documents

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Community Involvement

Public Meetings:

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Public Information Repositories

The public information repositories for the site are at the following locations:

The most complete collection of documents is the official EPA site file, maintained at the following location:

Superfund Records Center

Mail Stop SFD-7C

95 Hawthorne Street, Room 403

San Francisco, CA 94105

(415) 820-4700

Enter main lobby of 75 Hawthorne street, go to 4th floor of South Wing Annex.

Additional Links

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Contacts

EPA Site Manager
Kevin Mayer
415-972-3176
Mayer.Kevin@epamail.epa.gov
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
David Yogi
415-972-3350
1-800-231-3075
Yogi.David@epamail.epa.gov
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
415-947-8701
r9.info@epa.gov
State Contact
PRP Contact
Community Contact
Other Contacts
After Hours (Emergency Response)
US EPA
(800) 424-8802

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