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BLAINE985 TIMOTHY DRIVE <br /> CA <br /> TECH SERVICES 1 j$T 4 '93 SAN JOSE,(408)99 99 -5'!33 <br /> 5-5535 <br /> FAX (408) 293-8773 <br /> December 14, 1992 <br /> Brett Hunter <br /> Chevron U S A Products Company AM em <br /> 2410 Camino Ramon <br /> San Ramon CA 94583-0804 <br /> 83 0804 MAR j <br /> EN"ONMth HEALTM <br /> 09009SERV10ES <br /> 4th Quarter 1992 monitoring at 9-1848 <br /> Fourth Quarter 1992 Groundwater Monitoring at <br /> Chevron Service Station number 9-1848 <br /> 1257 Yosemite Avenue <br /> Manteca, California <br /> Monitoring performed November 17, 1992 <br /> Groundwater Sampling Report 921117-A-1 <br /> This report covers the routine quarterly monitoring of groundwater wells at this Chevron facility <br /> Blaine 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 /> Blayne Tech Services,Inc report no 921117-A-1 4th 0-1992 monitoring at Chevron 9-1848 <br /> page 1 <br />