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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street 2005 MAY 17 PM 2: 46 <br /> Escalon,California 95320 1 <br /> Telephone:(209)838-9888 5 A Pj 'C•"4'.'±� coz��d r y <br /> Facsimile:(209)838-9883 td s;'()f rt�e'A;Tu L <br /> NC`ZLTii L)EP ,RTAINT <br /> May 13, 2005 <br /> Mr. Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Former Reeve's Exxon, 2360 East Street, Tracy, California <br /> Dear Mr. Infurna: <br /> Ground Zero Analysis, Inc. (Ground Zero) is writing in response to your letter dated May 4, 2005 <br /> regarding the subject site. Your letter noted three deficiencies in recent submittals previously <br /> requested by the San Joaquin County Environmental Health Department (EHD). Your concerns <br /> and our responses are listed below. <br /> 1. Non-submittal of requested workplan. Your March 14, 2005 letter requested the workplan by <br /> April 15, 2005, with field work to be conducted in May and June 2005. The workplan was <br /> completed May 12, 2005 and is currently en route via U.S. Mail. The drilling permit <br /> application has also been completed and mailed to your office. <br /> 2. Not analyzing recently collected groundwater samples for oxygenated gasoline additives by <br /> EPA Method 8260B. You referred to analytical methods described in the May 23, 2002 letter <br /> by EHD for required analyses. however, the May 23, 2002 letter discusses analyses required <br /> for additional borings drilled to define the vertical and lateral extent of contamination at the site <br /> and does not address sampling from site monitoring wells. Regardless, the lack of EPA 8260B <br /> analyses does not invalidate the results of the EPA 801513/8021B analyses that were performed <br /> on samples collected from site wells in April 2005. Prior to the sampling conducted in April <br /> 2005, the site wells had been sampled for MTBE seven times since June 1996, including the <br /> last three (October 1997, February 2002, February 2003) by EPA 8260. Copies of those <br /> laboratory reports are enclosed. None of the wells contained detectable MTBE or any other <br /> oxygenated additive when EPA 8260 was used. In fact, the only positive detections of MTBE <br /> were in wells MW1 and MW2 in June 1996 and October 1996, when method EPA 8020 was <br /> utilized. As you know, using method EPA 8020/8021 can result in a false positive detection of <br /> MTBE. Under the circumstances, Ground Zero feels strongly that re-sampling the wells solely <br /> pestana.0361sumrpt.doc <br />