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s I <br /> -CAMBRIA L <br /> • f 1 � 4 f� J <br /> 1. <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 /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> WIC #204-7524-0808 <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 reporting requirements issued by the Regional Water Quality Control Board, <br /> 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 levels <br /> and collected samples from Wells MW-I through MW-3 on February 11, 1998 Samples <br /> were transported to Sequoia Analytical (Sequoia) in Redwood City, California for <br /> chemical analysis <br /> CAMBAIA <br /> • <br /> ENVIRONMENTAL Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> data and prepared a ground water contour/chemical concentration map (Plate 2) <br /> TECHNOLOGY,INC Ground water flow direction appears to flow southwest, at an approximate hydraulic <br /> 270 PERKINS STREET, gradient of 0 06 <br /> PO Box 259 . Ground water samples collected from Wells MW-1 through MW-3 contained ND levels <br /> SONOMA, of TPPH Benzene concentrations in all three wells ranged from 0 69 to 0 3 5 ppb <br /> MTBE concentrations in all three wells ranged from ND to 3 3 ppb by EPA Method <br /> CA 95476 8020 <br /> 0935.48 <br /> FAx(707}935-619 <br />