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BLAINS 1680 ROGERS AVENUE <br /> SAN JOSE CALIFORNIA 95112 <br /> TECH SERVICES (408)573 7771 FAX <br /> • �r��T of qo (408)573 0555 PHONE <br /> i <br /> s ' <br /> 7lL c <br /> n 4 <br /> 1 <br /> r March 1 1999 <br /> Brett Hunter <br /> Chevron U S A Products Company <br /> M P O Box 6004- _ _ _ <br /> San Ramon CA 94583-0904 <br /> 4th Quarter 1998 llonitoi ing at 9-4275 <br /> - Fourth Quarter 1998 Groundwater Monitoring at <br /> Chevron Service Station Number 9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton (A <br /> Monitoring Performed on Decenibei 17, 1998 <br /> Groundwater Sampling Report 981217-C-2 <br /> This report covers the routine monitoring of groundwater wells at this Chevron facility Blaine <br /> 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 Qualitv 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 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 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 to the Professional Engineering Appendix <br /> Blame Tech Services Inc Report No 981217-C 2 4th-0 1998 Monitoring at Chevron 9-4275 <br />