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CALTECH Environmental Laboratories AECCEIVED <br /> ' 6814 Rosecrans Avenue Par amount CA 90723-3146 MAR 3 0 2005 <br /> • Telephone (562) 272-2700 far (562) 272-2789 <br /> March 23, 2005 <br /> Ms Jo'1 Chapman <br /> ' Advanced Geo Environmental, Inc <br /> 837 Shaw Rd <br /> Stockton, CA 95215 <br /> ' RE Lathrop Gas & Food Mart (CT214-04080823) <br /> Dear Ms Chapman <br /> Per your request, Cal Tech Environmental Laboratory went back to verify the data <br /> analysis for the above project <br /> Soil and water samples received on August 04, 2004 around 09 00 am Samples were <br /> analyzes for VOC by method 8260B and TPH—Gasoline/Diesel by method 8015M <br /> The hydrocarbon contamination's are mostly in Gasoline Range Organic Based on our <br /> ' experience, the detected concentrations are degraded gasoline <br /> New gasoline would have fiont running peaks with sharp chromatograms and would also <br /> consist of MTBE and BTEX components Where as old/degraded gasoline, would have <br /> only Xylene and heavier components and tailing shape chromatograms <br /> Enclosed you will find a chromatogram of Gasoline standard and chromatogram of the <br /> soil sample that was analyzed on August 4, 2004 <br /> If you have any question or need additional information, please do not hesitate to call me <br /> tat (562) 272-2700 <br /> ' Sincerely, <br /> Roobik aghoubi <br /> ' Cal tech Environmental Laboratories <br /> s <br /> ' TOTALLY DEDICATED TO C US"1 OM EP, SATISFACTION <br />