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i 0 <br /> BEST CALIFORNIA GAS, LTQ. <br /> December 11, 2007 0.82672 <br /> Mr. Mike Infurna, Jr. [D) <br /> � � <br /> Senior REHS <br /> County of San Joaquin DEC 13 2007 <br /> Public Health Services/Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor ENVIROR1149EN'T HEALTH <br /> Stockton, CA 95202 PERNIMSERVICES <br /> RE: Best California Gas Ltd. Station #1.72 <br /> 7647 Pacific Avenue <br /> Stockton, CA 95207 <br /> Underground Storage Tank Pit Soil Sampling <br /> Dear Mr. Infuma: <br /> This letter is to confirm the telephone conversation earlier today between yourself and Mr. Chris <br /> Panaitescu of Thrifty Oil Co. regarding the collection of soil samples beneath the underground <br /> storage tanks (USTs) at the Best California Gas, Ltd. Station #172 located at 7647 Pacific <br /> Avenue, Stockton, California. <br /> The presence of the large quantity of pea gravel backfill in the UST pit makes it is unsafe to <br /> collect soil samples at the bottom of the excavation from beneath the USTs as required in the <br /> UST removal permit. Due to these adverse conditions, we agreed in our telephone conversation <br /> that the most suitable course of action is to backfill the UST excavation, and subsequently drill a <br /> series of nine boreholes through the backfilled excavation in order to collect the required soil <br /> samples beneath the former USTs. At the total depth of each borehole (expected at 18 to 20 feet <br /> below grade), a soil sample will be collected and analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX), and oxygenated compounds <br /> (including MTBE) using EPA Methods 8015 and 8260. These sampling activities will be <br /> completed by February 1, 2008 <br /> Should you have any questions regarding this letter, please contact Larry Higinbotham (025) or <br /> Chris Panaitescu at 562 921-3581 (x390). <br /> Respectfully submitted, <br /> �•., III <br /> Larry Higinbotham, R.G. Chris Panaitescu <br /> Project Manager C' General Manager <br /> Environmental Affairs <br /> cc: Mr. Ray von Flue, County of San Joaquin <br /> 13116 Imperial Highway, Santa Fe Springs, CA 90670-0138 • (562) 921-3581 <br />