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C A M B R I A <br /> APR 271999 <br /> ENVIFlk-W CENTAL HEALTFI <br /> PERMIT/SERVICES April 15, 1949 <br /> Mr Harm Knoll <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95201 <br /> Re Quarterly Monitoring Report - First Quarter 1999 <br /> Shell-branded Service Station <br /> 4445 Pershing Avenue <br /> Stockton, California <br /> Incident #98996182 <br /> SAP 4136142 <br /> Dear Mr Knoll <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 quarterly reporting requirements Issued by the Regional Water Quality <br /> Control Board, Central Valley Region and San Joaquin County Public Health Services <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 through MW-4, VEW-1, and VEW-2 <br /> on February 11, 1999 Samples were transported to Sequoia Analytical (Sequoia) of <br /> Redwood City, California for chemical analysis <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a ground water contour/chemical concentration map <br /> (Plate 2) Ground water flow direction varies beneath the site, flowing north, <br /> northeast and south from a hydraulic ridge located around Wells MW-2 and MW-4 <br /> Oakland CA The hydraulic gradients ranges from 0 003 to 0 02 <br /> Sonoma CA <br /> Portland OR <br /> 5 e a t t I e WA ' No TPPH or benzene were detected in any of the wells sampled Well VEW-1 <br /> contained MTBE at a concentration of 2 9 ppb MTBE was not detected in Wells <br /> Cambria MW-1 through MW-4 or VEW-2 <br /> Environmental <br /> Technology,Inc <br /> Perkins Street <br /> 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(7o7)935-6649 <br />