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{ 1E Poplar Avenue,Portervklle,CA 93257-5395 (209)'`72 4� <br /> BECISMA <br /> i <br /> December 13, 1993 <br /> r <br /> Mr. Michael Kith <br /> San Joaquin County s a <br /># Environmental Health Division ' <br /> P.O. Box 2009 ri <br /> Stockton, CA 95201-2009 ci <br /> w . <br /> 1 Dear Mr. Kith: <br /> Enclosed are the revised results for BTXE and TPH gas samples received from �'' M1, <br /> All American Trenching Inc. on November 5, 1993. - �� <br /> The results sheets were revised to show the detection limits required by San <br /> Joaquin County. <br /> The chromatograms for these samples were reviewed, along with the associated <br /> QA/QC data, before revising the results. The Beckman Environmental <br /> Laboratory routinely meets these detection limits, but reports the higher limits to <br /> meet certain other counties' reporting requirements. <br />' For lead analysis by Inductively Coupled. Plasma (ICP), the 0.042 mg/L detection 7 <br /> limit is an ideal detection limit achievable under perfect conditions. The <br /> laboratory detection limit for lead of 0.05 mg/L takes into consideration possible <br /> matrix effects associated with the sample. <br /> If you have any other questions or concerns, please call me. <br /> Sincerely, <br /> I <br /> Michael B. Cotton <br /> f Environmental Laboratory <br /> Operations Supervisor <br /> MBC:Ik <br /> enc. <br /> cc: Mr. Dave Charter, All America Trenching Inc. <br /> I <br /> Beckman Instruments. Inc_ <br /> Environmental Laboratory <br />