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BLAINE 1680 ROGERS AVENUE <br /> TECH SERVICES. SAN JOSE,CALIFORNIA 95112 <br /> (408)573-7771 FAX <br /> nr� (408)573-0555 PHONE <br /> June 20, 1997 <br /> Brett Hunter <br /> Chevron U.S.A. Products Company <br /> P.O. Box 6004 <br /> San Ramon, CA 94583-0904 <br /> 2nd Quarter 1997 Monitoring at 9-0557 <br /> Second Quarter 1997 Groundwater Monitoring at <br /> Chevron Service Station Number 9-0557 <br /> 139 South Center Street <br /> Stockton, CA <br /> Monitoring Performed on May 20, 1997 <br /> Groundwater Sampling Report 970520-H-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, <br /> purgewater containment, sample collection and sample handling in accordance with standard <br /> procedures that 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 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 /> Blaine Tech Services,Inc. Report No. 970520-H-1 2nd-Q 1997 Monitoring at Chevron 9-0557 <br />