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1� <br /> CAMBRIA <br /> April 30, 1998 <br /> Mr Alex Perez <br /> Shell Oil Products Company <br /> P O Box 8080 <br /> Maitinez, Califoinia 94553 <br /> Re Quarterly Monitoring Report - First Quarter 1998 <br /> Shell Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> WIC 4204-7525-0104 <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 (SJCPHS) <br /> Quarterly Monitoring & Sampling Summary <br /> Ground water monitoring and sampling for the first quarter of 1998 are summarized below <br /> • Blaine fech Services, Inc (Blaine), of San Jose, California measured ground water levels <br /> and collectcd samples from Wells MW-1 through MW-7 and VEW-2 on February 10, <br /> 1998 Samples were transported to Sequoia Analytical in Redwood City, California for <br /> chemical analysis <br /> CAMBRIA <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) The <br /> TECHNOLOGY,INC ground water flow direction was to the southeast The hydraulic gradient varied across <br /> 270 PERKINS STREET, the site, from 0 003 in the north, to 0 0007 in the south <br /> PO Box 259 The concentration of TPPII in ground water samples from this site ranged from ND to <br /> SONOMA, 120,000 ppb Benzene concentrations ranged from ND to 22,000 ppb, and MTBE <br /> concentrations ranged from ND to 2,500 ppb Methanol and ethanol were not detected <br /> CA 95476 in ground water samples from any of the wells this quarter _ <br /> 0935450 <br /> FAx{707)935-6649 <br />