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KAPREALIAN ENGINEERING, INC. <br /> Consud!!ng Engineers <br /> P.O. BOX 996 - BENICIA, CA 94510 <br /> (707)746-6915 • (707)746-6916- FAX: (707)746-55P1 <br /> 09 <br /> KEI-P91-0202.P1 <br /> February 22, 199E <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, CA 94583 <br /> t <br /> Attention: Mr. Rick Cisk <br /> RE: Work Plan/Proposal <br /> Unocal Service Station #6015 <br /> 601 E. Kettleman Lane <br /> Lodi California <br /> INTRODUCTI0N <br /> 1. Background• <br /> On February 20, 1991, Kaprealian Engineering, Inc. (KEI) col- <br /> lected soil samples following the removal of two 10,000 gallon <br /> gasoline storage tanks, one 10,000 gallon diesel storage tank, <br /> and one 550 gallon waste oil tank at the referenced site. The <br /> soil samples under the fuel storage tanks were collected at <br /> depths ranging from 15.5 to 16.5 feet. The soil sample under <br /> the waste oil tank was collected at a depth of 11 feet. The <br /> soil samples under the pipe trenches were collected at depths <br /> ranging from 2 to 3.5 feet. All soil samples were analyzed by <br /> Sequoia Analytical Laboratory in Concord, California. The <br /> samples under the gasoline storage tanks were analyzed for <br /> total petroleum hydrocarbons (TPH) as gasoline, benzene, <br /> toluene, xylenes and ethylbenzene (BTX&E) , total lead, and <br /> ethylene dibromide (EDB) . The samples under the diesel <br /> storage tank were analyzed for TPH as diesel and BTX&E. <br /> Except for sample C2, analytical results of the soil samples, <br /> collected from the fuel and diesel tank pits, indicated non- <br /> detectable levels of TPH as gasoline, TPH as diesel, total <br /> lead and EDB. Benzene levels ranged from 0.011 ppm to 0.016 <br /> ppm. however, analyses of soil sample C2 showed TPH as 0 <br /> gasoline levels at 3,900 ppm, and benzene levels at 7.4 ppm. <br /> The soil samples from under the waste oil tank and the waste <br /> eil pa epee trench were analyze or otal extractable petroleum ? <br /> hydrocarbons (TEPH) , BTX&E, EPA method 8010 and PCB's using <br /> method 8080, and metals - cadmium, chromium, lead and zinc. <br /> Laboratory analyses showed non-detectable levels of TEPH, <br /> metals ranging from non-detectable to 18 ppm, with non-detec- <br /> table-levels-ot_all--other_ analytes.-_The samples from beneath <br /> the product pipe trenches were analyzed for TPH as gasoline, <br /> BTY&F, total lead and EDB. In addition, the samples from <br />