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Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> October 11, 1994 <br /> Page 2 <br /> Soil Sampli� <br /> After removal of the product lines and dispensers, one soil sample will be collected from native soil <br /> beneath each 20 linear feet of piping, and one soil sample will be collected from beneath each of the <br /> former product dispensers. Additional soil samples may be collected from overexcavated trenches <br /> at the discretion of the Delta and San Joaquin County representatives at the site. Four soil samples <br /> will be collected from each 50 cubic yards of stockpiled soil, with each set of four samples to be <br /> composited in the laboratory prior to analysis. Soil samples will be collected in 2-inch diameter by <br /> 6-inch long brass tubes, which will be sealed with Teflon tape and plastic caps. The samples will <br /> be stored in an ice chest cooled to 4°C for transport to the laboratory. <br /> Soil samples will be submitted to a state-certified laboratory for analysis of benzene, toluene, <br /> ethylbenzene, xylenes, and total petroleum hydrocarbons as gasoline. In addition, the two stockpile <br /> composite samples with the highest concentrations of petroleum hydrocarbons will be analyzed for <br /> halogenated volatile organic compounds and the following metals: arsenic, barium, cadmium, <br /> chromium, cobalt, copper, lead, mercury, nickel, and zinc. The halogenated volatile organic <br /> compounds and metals are being analyzed for acceptance of excavated soils at the Bio Industries, Inc. <br /> landfill. The samples will be analyzed using methods approved by the U.S. Environmental Protection <br /> Agency and the California Department of Health Services. <br /> Remarks/Signatures <br /> Delta recommends that a copy of this letter be forwarded to: <br /> Mr. Harlin Knoll Mr. James B. Maughan <br /> Division California Regional Water <br /> Environmental Health Divi s g <br /> Public Health Services Quality Control Board, <br /> Valley i <br /> San Joaquin County Central V a ey Reg on <br /> 1601 East Hazelton Avenue 3443 Routier Road <br /> Stockton, California, 95201 Sacramento, California 95827 <br /> If you have any questions regarding this project, please call me at (916) 638-2085. <br /> Sincerely, <br /> DELTAENVIRONMENTAL CONSULTANTS, INC. <br /> l <br /> Richard E. Chandler <br /> Project Manager/Hydrogeologist <br />` REC (LRP346.SJH) <br />,s <br /> Enclosure <br /> E <br />