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NPL Site Narrative for GBF, Inc., Dump
GBF, INC., DUMP
Antioch, California
Federal Register Notice: February 7, 1992The GBF, Inc., Dump covers approximately 88 acres at the corner of Somersville Road and James Donlon Boulevard in Antioch, Contra Costa County, California. The site is bounded on the north and east by residential developments, to the south by open space and a former sanitary landfill (Lynch landfill) that accepted municipal wastes, and to the east by open space and a former petroleum tank farm.
Between the early 1960s and 1975, Industrial Tank Corp. leased the eastern 64 acres of the site and operated up to 10 surface impoundments covering approximately 11 acres. The unlined impoundments were interconnected by a series of cascading conduits, allowing liquid wastes to flow freely. The company accepted sludges, acids, oils, and slurries containing such hazardous substances as hexavalent chromium, lead, cyanide, asbestos, acetone, trichloroethylene, benzene, tetrachloroethylene, formaldehyde, phenol, DDT, and diazinon.
In 1974, the California Regional Water Quality Control Board (CRWQCB) issued a Cleanup and Abatement Order which closed the surface impoundments and prohibited hazardous waste disposal at the site after October 1, 1974. Since then, the site has accepted only non-hazardous waste.
Monitoring wells on and north of the site are contaminated with cadmium, nickel, cyanide, and numerous volatile organic compounds (VOCs), according to a 1990 report of a consultant to the California Department of Toxic Substances Control (CDTSC).
An intermittent creek, Markley Creek, runs north along the western property boundary, and a drinking water canal, the Contra Costa Canal, runs west along the northern property boundary. Markley Creek runs between the cities of Antioch and Pittsburg and eventually empties into a marsh adjacent to the San Joaquin River. High lead levels (65 milligrams per kilogram) were detected in the sediments of Markley Creek adjacent to the site. The Contra Costa Canal is the primary source of drinking water for cities in the area of the site. Intakes within 15 miles downstream of the site provide drinking water to approximately 327,500 people. Residents outside the limits of the municipal canal water system generally drink bottled water.
CDTSC, with input from CRWQCB, is overseeing field work for the remedial investigation/feasibility study (RI/FS) to determine the type and extent of contamination at the site and identify alternatives for remedial action. The RI/FS is underway.
This site was proposed to the NPL on June 24, 1988 (53 FR 23988) on the basis of a score above the 28.50 cutoff on the original Hazard Ranking System (HRS). In response to public comments, the score fell to below the cutoff, and the site was dropped from consideration for the NPL on October 4, 1989 (54 FR 41015). It is being proposed at this time on the basis of its score on the revised HRS. New information was used to evaluate the surface water pathway, which is scored differently under the two systems.
For more information about the hazardous substances identified in this narrative summary, including general information regarding the effects of exposure to these substances on human health, please see the Agency for Toxic Substances and Disease Registry (ATSDR) ToxFAQs. ATSDR ToxFAQs can be found on the Internet at http://www.atsdr.cdc.gov/toxfaq.html or by telephone at 1-888-42-ATSDR or 1-888-422-8737.