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r� <br /> - <br /> El361ME�Pi� TANK PROTEO'i ENGINEERING <br /> 25.21 Whipple road <br /> n a,•',n <br /> Union City.CA 94587 OCT <br /> ! 1�. <br /> (4151429.0088•1.4001 523.8063 <br /> FAX(414)'129-8085 <br /> September 29, 1992 <br /> Mr. Harlan Knoll <br /> County of San Joaquin <br /> Environmental Health l�ivisi:n <br /> Public Health Services <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> RE: Documentation of Overexcavation of Contanlinated Soil at Collegeville Market <br /> and Cafe on December 3 and 4, 1991 <br /> Dear Mr. Knoll: <br /> This letter is an addendum to Tank Protect Engineering of Northern California's (TPE) <br /> March 17, 1992 Wer lan for Overexcavation of Contaminated Soil and Drillin and <br /> r Sam li 1 One Soil Sorin and July 31, 1992 Preliminary Site Assessment Repan. The <br /> introduction and site history of the above respective workplan and report are amended <br /> to docu:nent that AAA Tank Removal Seryice (AAA) poda representative of TPE <br /> conducted overexcavation of cont.uninated soil in the area of the former dispenser <br /> island (see attached Figure). This area also formerly contained 2 undergroupri gasoline <br /> Links and 1 underground waste ail tank. <br /> i PE understands the subject overexcavat"son was conducted because (=oil contamination <br /> was documented adjacent to the dispenser island by Uriah Inc (( ) <br /> excavation of contaminated soil on February 2i, 199their <br /> 1• Uriah's snit sample EC-15 <br /> petroleum h drocarbcns as gasoiane (TPHG); benzene, toluene, <br />- detected total p Y <br /> ethylbenzene, and xylenes (B-rEX) at concentrations of 920 parts per million {ppm), <br /> 3..0 pr,1n, 36.0 ppm, 14.0 ppm, and 85.0 ppm, respectively, at a ,'leptl, of about 15 feet <br /> -..---_._ _._.(seer--Urialils._March__14.,-_I991 lnterlm Report). <br />