Superfund Site Profile

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The Louisiana-Pacific Corp. site consists of two pieces of property located a half-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. In 1973, high levels of pentachlorophenol (PCP) were discovered in nearby residential wells. By 1983, a groundwater contaminant plume containing PCP extended one-and-a-half miles south of the neighboring Koppers Company, Inc. wood-treating plant, another Superfund site. Site-related chemicals caused low levels of contamination in the shallow aquifer beneath the plant. Following cleanup, EPA took the site off the Superfund program’s National Priorities List (NPL) in 1996.