Pacific Southwest, Region 9: Superfund
Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations
EPA #: CAD065021594
City: South of Oroville
Congressional District: 02
Other Names: Georgia Pacific
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Description and History
NPL Listing History
NPL Status: Deleted
Proposed Date: 10/15/84
Final Date: 06/10/86
Deleted Date: 11/21/96
The Louisiana-Pacific Corp. site consists of two pieces of property located 1/2 mile apart: a 100-acre wood processing plant and a 115-acre landfill. Georgia-Pacific Corporation built the plant in 1969 and operated it until 1973, when the Louisiana-Pacific Corp. assumed plant ownership and operation. In 1978, the California Solid Waste Management Board approved a permit for Louisiana-Pacific Corp. to operate the landfill. The plant (which has shut down since the site was delisted in 1996) was made up of the following components: a log deck and log deck pond, a sawmill, a kiln dryer, the planing mill, a hardboard manufacturing plant, and wood particle storage areas. Prior to 1980 when a recycling system was installed, wastewater from the hardboard plant's glue kitchen was discharged to an unlined pond at the site. Until 1988, a fungicide spray was applied to cut timber several months of each year. In 1973, high levels of pentachlorophenol (PCP) were discovered in nearby residential wells. By 1983, a groundwater contaminant plume containing PCP extended 1 1/2 miles south of the neighboring Koppers Company, Inc. wood treating plant, another NPL site. Approximately 10,650 people live within 3 miles of the site and use groundwater as a source of drinking water. Site-related chemicals have caused low levels of contamination in the shallow aquifer beneath the plant.
Contaminants and Risks
- Surface Water
- Soil and Sludges
Dust samples showed contamination with PCP, formaldehyde, and other volatile organic compounds (VOCs). Groundwater is contaminated with low levels of arsenic and formaldehyde. Contaminants found in sediments include PCP, dioxins, furans, heavy metals, and polynuclear aromatic hydrocarbons (PAHs). Surface water contains PCP and heavy metals including arsenic, boron, and copper. At the time the site was deleted from the NPL in 1996, the only current health risk was inhalation of air emissions from the hardboard plant (the entire plant has since shut down).
Investigation and Cleanup Activities
This site has been addressed in a long-term remedial phase focusing on investigation of the groundwater and soil.
Groundwater and Soil: In late 1990, the EPA issued an interim Record of Decision. The interim soil remedy included site access restrictions, such as a perimeter fence, deed restrictions on future residential use of the site, and additional soil sampling. The groundwater remedy included establishing well permit restrictions and monitoring of on-site wells to obtain additional information about formaldehyde and arsenic levels in the groundwater at the site. The additional soil and groundwater investigations were completed by early 1995, and in August 1995 EPA determined that no further cleanup actions are needed at the site.
The requirements for deed and well permit restrictions have been removed, and no further monitoring is required. While the plant was still in operation, air emissions from the hardboard plant were addressed under the Clean Air Act permit program.
Cleanup Results to Date
The interim actions reduced the threat of exposure to contaminated soil and groundwater while additional information was obtained to determine the need for any further cleanup actions. A final no-action ROD was issued in August 1995 and EPA delisted the Louisiana-Pacific Corp. site in November 1996.
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.
Documents and Reports
Public Information Repositories
The public information repositories for the site are at the following locations:
Butte County Public Library,
1820 Mitchell Avenue,
Oroville, CA 95965
California State University at Chico,
Chico, CA 95929-0295
EPA Site Manager
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
Mail Code SFD-6-3
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
After Hours (Emergency Response)