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�Nt�� 1680 ROGERS AVENUE <br /> .eft SERVICES.K SAN JOSE,CALIFORNIA 95112 <br /> (408)573-7771 FAX <br /> Th (408)573-0555 PHONE <br /> y <br /> C ~� <br /> �c <br /> i IND <br /> March 20, 1997 <br /> Brett Hunter <br /> Chevron U.S.A. Products Company <br /> P.O. Box 6004 <br /> San Ramon, CA 94583-0904 <br /> 1st Quarter 1997 Monitoring -It 9-0557 <br /> First Quarter 1997 Groundwater Monitoring at <br /> Chevron Service Station Number 9-0557 <br /> 139 South Center Street <br /> Stockton, CA <br /> Monitoring Performed on February-27, 1997 <br /> Groundwater Sampling Report 970227-1-1-1 <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 /> r, <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. 970227-H-1 1 St-0 1997 Monitoring at Chevron 9-0557 <br />