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.f <br /> CAMBRIA <br /> April 15, 1998 <br /> Mr Alex Perez <br /> Shell Oil Products Company <br /> P O Box 8080 <br /> Martinez, California 94553 <br /> Re Quarterly Monitoring Report - First Quarter 1998 <br /> Shell Service Station <br /> 4445 Pershing Avenue <br /> Stockton, California <br /> WIC #204-7524-2408 <br /> Dear Mr Perez <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> ground water monitoring and sampling at the referenced site (Plates 1 and 2) This report was <br /> prepared to meet quarterly reporting requirements issued by the Regional Water Quality Control <br /> 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 levels <br /> from Wells MWA through MW-4, VEW-1, and VEW-2 and collected samples from <br /> Wells MWA through MW-4 and VEW-1 on February 10, 1998 Samples were <br /> transported to Sequoia Analytical (Sequoia) of Redwood City, California for chemical <br /> CAMBRIA analysis <br /> ENVIRONMENTAL <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> TECHNOLOGY,INC data and prepared a ground water contour/chemical concentration map (Plate 2) <br /> 270PLRRINSSTREEr, Ground water flow direction appears to vary at the site flowing northeast, east, and south <br /> of Well MW-4 at approximate hydraulic gradients of 0 01 to 0 04 <br /> PO Box 259 <br /> SONOMA • Wells MW-1, MW-2 and VEW-1 contained TPPH at concentrations ranging from 54 to <br /> 180 ppb Wells MW-1, MW-2, MW-4 and VEW-I contained benzene at concentrations <br /> CA 95476 ranging from 2 to 20 ppb Well MW-3 was ND for TPPH Well VEW-1 contained 54 <br /> 090 ppb MTBE Wells MW-1 through MW-4 were ND for MTBE <br /> Fax (7071935.6649 <br /> L <br /> I <br />