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_ 1 _ <br /> ii <br /> C A M B R I A <br /> r�} <br /> October 15, 1998 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95201 <br /> Re Quarterly Monitoring Report - Third Quarter 1998 <br /> Shell-branded Service Station <br /> 4445 Pershing Avenue <br /> Stockton, California <br /> WIC 4204-7524-2408 <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 l 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 .lose, California measured ground water <br /> levels and collected samples from Wells MW-1 through MW-4, VEW-1, and VEW-2 <br /> on August 12, 1998 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 appears to be predominately to the north at <br /> an approximate hydraulic gradient of 0 004 <br /> Oakland CA 0 No TPPH or benzene were detected in any of the wells sampled Wells MW-4, <br /> Sonoma <br /> A <br /> Portland VEW-1, and VEW-2 contained MTBE concentrations of 4 6, 13, and 5 0 ppb, <br /> Seattle WA respectively MTBE was not detected in Wells MW-1, MW-2, and MW-3 <br /> Cambria <br /> Environmental <br /> Technology, Inc <br /> 270 Perkins street <br /> PO Bax 259 <br /> Sonoma CA 95476 <br /> Tel (707)935-4850 <br /> Fax(707)935-b649 <br />