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BLAINE 1880 ROGERS AVENUE <br /> TECH SERVICER. SAN JOSE,CALIFORNIA 95112-1105 <br /> (408)579-7771 FAX <br /> STS Aga (408)573-0555 PHONE <br /> �e <br /> April 1, 1999 <br /> Brett Hunter <br /> Chevron U.S.A. Products Company <br /> P.O. Box 6004 <br /> San Ramon, CA 94583-0904 <br /> Ist Quarter 1999 Monitoring at 9-0557 <br /> First Quarter 1999 Groundwater Monitoring at <br /> Chevron Service Station Number 9-0557 <br /> 139 South Center Street <br /> Stockton, CA <br /> Monitoring Performed on February 17, 1999 <br /> I <br /> Groundwater Sampling Report 990217-K-1 j <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 tire, 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 WELI. DATA AND ANALYTICAL RESULTS. 'File lull <br /> analytical report for the most recent samples is located in the Analytical Appendix. Tile table <br /> also contains new groundwater elevationca[culations taken from the colllputer plotted gradient <br /> Blaine Tech Services, Inc. Report No. 990217-K-1 1st-0 1999 Monitoring at Chevron 9-0557 <br />