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C A M B R I A <br /> January 15, 1999 <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 - Fourth 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 Jose, California measured ground water <br /> levels Wells MW-1 through MW-4, VEW-1, and VEW-2 and collected samples from <br /> Wells MW-1 through MW-4, and VEW-1 on October 28, 1998 Samples were <br /> transported to Sequoia Analytical (Sequoia) of Redwood City, California for chemical <br /> 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 <br /> Sonoma CA <br /> Portland OR 0 No TPPH or benzene were detected in any of the wells sampled Well VEW-1 <br /> Seattle WA contained MTBE at a concentration of 7 2 ppb MTBE was not detected in Wells <br /> MW-1 through MW-4 <br /> Cambria <br /> Environmental <br /> Technology, Inc <br /> 110 Perkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel (707)935-4850 <br /> Fax(707)935-6649 <br />