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JUN 09 '93 PWM <br /> 985 TIMOTHY DRIVE <br /> BLAINE SAN JOSE,CA 95133 <br /> (408)995-5535 <br /> 1 LA TECH SERVICES INC FAX(408)293-8773 <br /> June 4, 1993 <br /> Brett HunterK" <br /> E U V ED <br /> Chevron U S A Products Company <br /> 2410 Camino Ramon S E P 0 7 1993 <br /> San Ramon, CA 94583-0804 ENVIRONMriNTAL HEALTH <br /> PERMIT/SERVICES <br /> 2nd Quarter 1993 monitoring at 9-1848 <br /> Second Quarter 1993 Groundwater Monitoring at <br /> Chevron Service Station number 9-1848 <br /> 1257 Yosemite Avenue <br /> Manteca, Cahformua <br /> Monitoring performed May 19, 1993 <br /> Groundwater Sampling Report 930519-V-4 <br /> This report covers the routine quarterly monitoring of groundwater wells at this Chevron facility <br /> Blame Tech Services, Inc work at the site includes inspection, gauging, evacuation, purgewater <br /> containment, sample collection and sample handling in accordance with standard procedures that <br /> conform to Regional Water Quality Control Board requirements <br /> Routine field data collection includes depth to water, total well depth,thickness of any separate <br /> immiscible layer, water column volume, calculated volume of a three case volume purge, <br /> elapsed evacuation time, total volume of water removed, and standard water parameter <br /> instrument readings Sample material is collected, contained, stored, and transported to the <br /> laboratory in conformance with EPA standards Purgewater is,likewise, collected and <br /> transported to Chevron's Richmond Refinery for disposal <br /> Basic field information is presented alongside analytical values excerpted from the laboratory <br /> report in the cumulative table of WELL DATA AND ANALYTICAL RESULTS The full <br /> analytical report for the most recent samples is located in the Analytical Appendix The table <br /> also contains new groundwater elevation calculations taken from the computer plotted gradient <br /> map which is located in the Professional Engineering Appendix <br /> Blaine Tech Services,Inc report no 930519-V-4 2nd Q-1993 monitoring at Chevron 9-1848 Page i <br />