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`l BLAINS 1880 ROGERS AVENUE <br /> TECH SERVICES— SAN JOSE,CALIFORNIA 95112-1105 <br /> (408)573-7771 FAX <br /> Nr T (408)573-0555 PHONE <br /> � w <br /> 7 <br /> }A <br /> c, �t <br /> March 17, 2000 <br /> Brett 1-lunter <br /> Chevron U S A Products Company <br /> P O Box 6004 <br /> San Ramon, CA 94583-0904 <br /> 4th Quarter 11999 Monitoring at 9-4275 <br /> Fourth Quarter 1999 Groundwater Monitoring at <br /> Chevron Service Station Number 9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, CA <br /> Monitoring Performed on DeLCn1bei 16 & 22, 1999 <br /> Groundwater Sampling Report 991216-K-1 <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 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 confoimance 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 groundwatei elevation calculations taken from the computer plotted gradient <br /> map wh1Lh is located in the Professional Engineering Appendix <br /> Blaine Tech Services Inc Report No 991216-K-1 4th-0 1999 Monaonng at Chevron 9-4275 <br />