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BLAINE 1680 ROGERS AVENUE <br /> TECH SERVICES» SAN JOSE CALIFORNIA 95112 <br /> (408)573-7771 FAX <br /> (408)573-0555 PHONE <br /> July 27, 1998 <br /> Brett Hunter <br /> Chevron U S A. Products Company <br /> P 0 Box 6004 <br /> San Ramon, CA 94583-0904 <br /> 2nd Quarter 1998 Monitoring at 9-8264 <br /> Second Quarter 1998 Groundwater Monitoring at <br /> Chevron Service Station Number 9-8264 <br /> 3775 Tracy Blvd. <br /> Tracy, CA <br />• Monitoring Performed on June 9, 1998 <br /> Groundwater Sampling Report 980609-J-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 conformance with EPA standards Purgewater is, likewise, collected and <br /> transported to McKittnck 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 in the Professional Engineering Appendix <br /> Blaine Tech Services, Inc Report No 980689-J-1 2nd 0 -1998 Monitoring at Chevron 9-8264 <br />