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4( <br /> Geological Audit Services, Inc. <br /> �WE Environmental Professionals <br /> v <br /> 1803 March Lane, Suite A•Stockton,CA 95207-6414•(209)956-0264•Fax(209)956-0700 <br /> August 18, 1994 <br /> SC-93-09-792-03 <br /> Mr. Frank Caldron <br /> CALDRON'S GENERAL STORE <br /> 12750 West Byron Road <br /> Tracy, CA 95376 <br /> Subject: Stockpiled Soil Bioremediation HP u 7 1994 <br /> Caldron's General Store <br /> 12570 West Byron Road, Tracy, California ENV,?cj%,ME�,;�.. -41A�i,+ <br /> PILRM�MSc:<V'Ccs <br /> Dear Mr. Caldron: <br /> In accordance with your request, Geological Audit Services, Inc. (GeoAudit) has prepared <br /> this report for the remediation of petroleum hydrocarbon impacted soil currently stockpiled <br /> at 12570 West Byron Road. <br /> INTRODUCTION <br /> From November 30 to December 1, 1993, approximately 125 cubic yards of soil were <br /> excavated from the location of the former underground storage tank (UST) at 12570 West <br /> Byron Road in Tracy, California (the site). The soil was divided into three stockpiles and <br /> placed on plastic sheeting. On December 1, 1993, one sample was collected from each of <br /> the three stockpiles. Stockpile SP1 was later separated into stockpiles SP1 and SP4. The soil <br /> is currently separated into four treatment cells. <br /> PROCEDURES <br /> The degradation of several hydrocarbon products by bacteria is a well documented process. <br /> Treatment cells are constructed with polyethylene liners, and the soil is piled between two <br /> and three feet high. Twelve to 16 species of microbes, in a liquid broth culture are <br /> inoculated in the treatment cells, and the piles are covered with polyethylene sheeting. By <br /> utilizing the carbon present in the hydrocarbons as their source of food, the aerobic bacteria <br /> generate by-products, which are simple and non-hazardous, such as water, carbon dioxide <br /> and biomass. - <br /> Geological Audit Services,Inc. <br /> 792-SCALD-BIO.RPT <br /> Full Spectrum Environmental Services• Hydrogeology <br />