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985 TIMOTHY DRIVE <br /> BLAINE SAN JOSE,CA 95133 <br /> TECH <br /> SE®®VICINC (408) 995-5535 <br /> FAX (408)293-8773 <br /> January 9, 1997 <br /> Brett Hunter <br /> Chevron U S A Products Company <br /> P O Box 5004 <br /> San Ramon, CA 94583-0804 <br /> 4th Quarter 1996 Monitoi ing at 9-4275 <br /> Fourth Quarter 1996 Groundwater Monitoring at <br /> Chevron Service Station Number 9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, CA <br /> Monitoring Performed on December 4, 1996 <br />• <br /> Groundwater Sampling Report 961204-Z-1 <br /> This report covers the routine quarterly monitoring of groundwater wells at this Chevron facility <br /> Blaine Tech Services, Inc 's 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, elapsed <br /> evacuation time, total volume of water removed, and standard water parameter instrument <br /> readings Sample material is collected, contained, stored, and transported to the laboratory in <br /> conformance with EPA standards Purgewater is, likewise, collected and transported to <br /> McKittrick Waste Treatment Site 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 RESUL'T'S The full <br /> analytical report for the most recent samples is located in the Analytical Appendix The table <br /> 41so 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 961204-Z-1 4th-0 1996 Monitoring at Chevron 9-4275 <br /> f <br />