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KAPREALIAN ENGINEERING, INC. <br /> Consulting Engineers <br /> P.U. Box 996 • BEMCEA, CA 94510 <br /> (707)746-6915 • (707)746.6916 • FAX:(707)746-5581 <br /> KEj-P91-0202.P1R <br /> March 11, <br /> 1991 <br /> 13nocal Corporation Suite 400 <br /> 2000 Crow Canyon Place, �r;-,._t,. --�•�3 <br /> CA 94583 <br /> San Ramon r <br /> Attention: Mr. Rick Sisk <br /> RE: Revised Work Plan/Proposal <br /> Unocal Service station 16015 <br /> 601 E'Calttleman ifornia Fane <br /> Lodi <br /> -INTRODUCTION <br /> 1, Back round: Inc. (KEY) col- <br /> 1991, Kaprealian Engineering, (KE gallon <br /> On February 20, les following the rer.;oval of two 10, e tank, <br /> lected soil samples <br /> one 10,000 gallon diesel storag <br /> eferenced site. The <br /> gasoline storage at <br /> and one 550 gallon waste oil tank rage tanks were collected uder <br /> soil samples under the fuel storag The <br /> in from 15.5 to 16.5 feet. `rhsoflllafeet• <br /> depths <br /> ranging <br /> trenches wa �oeations at <br /> edshown <br /> the waste oil tank was collected at a <br /> depth <br /> soil samples under the pipe les were <br /> ranging from 2 to 3.5 feet.plant r qur sample All soil sampCalifor" <br /> on the attached uaia Analytical Laboratory in Concord, were <br /> d by gasoline storage tanks <br /> analyzesamples under the g TPH) as gasoline, <br /> nia. The petroleum hydrocarbons ( ETX&E) , total <br /> analyzed for total p lbenzene <br /> toluene, xylenes and ethy The samples under the <br /> benzene, dibx�mide (EAB) . <br /> lead, and ethylenezed for TpH as diesel and Biles, <br /> diesel storage tank were analy <br /> tical results of the soil sam <br /> * for sample C2, analy its, indicated non- <br /> from and diesel tank H as diesel, total <br /> collected from the of TPH as gasoline, 0.016 <br /> ed from 0.011 ppm to <br /> detectable levels Sam le C2 showed TPH as <br /> lead and EDB. Benzene levels rang <br /> ppm, However, analyses of soil imp <br /> le <br /> ppm, and benzene levels at 7.4 ppm• <br /> gasoline levels at 3, petroleum <br /> The soil samples from ana zed for total extractable phe waste <br /> BTX&E, EPA method 8010 and PCB's using <br /> oil pipe trench were lead and zinc. <br /> hydrocarbons (TEPH - cadmium, chromium, of TEpg, <br /> method 6080, and metals howednon-detectable levels detec- <br /> -- _.. _....._.- - ----- with.._non- <br /> analy - - ---- <br /> Laboratory from non-detectable to 18 pp 'les from beneath__ <br /> metals rangingother tes. The samp gasoline, <br /> table levels of al <br /> trenches were analyzed far TPH as g <br /> the product Pipe <br />