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I r <br /> CALTECH Environmental Laboratories AECIVD <br /> 6814 Roseciaii% Avenue 1'awinotnit ( A 90723-3146 MAR 3 0 2005 <br /> lelep1101u, (562) 272-2700 F av (562) 272-2781) <br /> I <br /> March 23, 2005 <br /> Ms Io'l 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 /> I <br /> The hydrocarbon contaminations are mostly m Gasoline Range Organic Based on our <br /> 1 experience, the detected concentrations are degraded gasoline <br /> New gasoline would have front 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 /> ' at(562) 272-2700 <br /> Sincerely, <br /> Roobik aghoubi <br /> Cal tech Environmental Laboratories <br /> i <br /> I <br /> 10 rAI I Y 1)I-I)I( \1-1 l) 1() ( l 5"I(AlI R '-,AT IS1 A(1 ION <br />