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t1 `" IT Corporation <br /> 3939 Cambridge Road, Smite 220 <br /> Cameron Park, CA 956829007 <br /> R1 530 676 6884 <br /> ,�the t Fax 530 676 6885 <br /> � -„ <br /> �t;A�eou <br /> , - �j h A Member of The IT Group <br /> p- <br /> January <br /> ) U 4, 2000 <br /> Project 791711 <br /> Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Services <br /> 304 E Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> RE Historical Chromatogram Review of MTBE Soil Analytical for ARCO Service <br /> Station No 6100, Located at 25775 South Patterson Pass Road, Tracy, California <br /> Dear Ms Lagorio <br /> On behalf of ARCO Products Company (ARCO), Pinnacle/IT is submitting this letter in <br /> response to your letter dated June 15, 1999 requesting historical MTBE soil analytical for <br /> ARCO Service Station No 6100, Located at 25775 South Patterson Pass Road, Tracy, <br /> California Other information requested in the June 15, 1999 letter was provided in the <br /> September 10, 1999 "Addendum to the Hydrocarbon Mass Estimate " The attached <br /> information includes Sequoia Analytical's review and interpretation of soil sample <br /> analytical chromatograms <br /> Sequoia Analytical conducted an Environmental Protection Agency (EPA) Method 8020 <br /> Chromatogram Review of MTBE soil analytical back to December 15, 1992 Sequoia <br /> Analytical has destroyed all data prior to September 1992 and was unable to locate data <br /> from September 1993 During this review Sequoia's chemists estimated that the MTBE <br /> concentrations were below laboratory detection limits in all samples researched These <br /> findings lead IT to believe that there are not MTBE impacts to soil at the subject site <br /> (See Attached Sequoia Analytical EPA 8020 Chromatogram Review) <br /> Please feel free to call with any questions regarding this letter, (530) 676-6884 <br /> Sincerely, <br /> IT Corporation <br /> vc <br /> Pat Jimison Mark Capps <br /> Geologist Project Geologist <br /> Attachments Sequoia Analytical, EPA 8020 Chromatogram Review <br /> cc Paul Supple, ARCO Products Company <br /> Mark List, Regional Water Quality Control Board, Central Valley Region <br /> CP1C 1ARCH[VLIARC016i00\CORRE5\ML010400 DOC <br />