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CAMBRIA <br /> . <br /> _e,% <br /> _ L 1 <br /> April 15, 1999 <br /> Margaret Lagorio <br /> San Joaquin County Environmental Health Division <br /> P O Box 388 <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report — First Quarter 1999 <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> Incident #98996180 <br /> SAP #136139 <br /> Dear Ms Lagorio <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates I and 2) This report <br /> was prepared to meet reporting requirements issued by the Regional Water Quality Control <br /> Board, Central Valley Region and the San Joaquin County Environmental Health Division <br /> . Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for this quarter are summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured ground water <br /> levels and collected samples from Wells MW-1 and MW-3 on February 23, 1999 <br /> MW-2 could not be located It was temporarily buried beneath a soil pile generated <br /> by an off-site construction project Samples were transported to Sequoia Analytical <br /> (Sequoia) in San Carlos, California for chemical analysis <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a graobrid water elevation/chemical concentration map <br /> (Plate 2) <br /> Oakland CA <br /> Sonoma C A . Ground water samples collected from Wells MW-1 and MW-3 contained non- <br /> Portland OR <br /> Seattle WA detectable (ND) levels of TPPH and benzene MTBE was present in Well MW-3 at a <br /> concentration of 72 6 ppb <br /> Cambria <br /> Environmental <br /> Technology,Inc <br /> OeTkins Street <br /> P 0 Bax 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />