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BLAINE 1680 ROGERS AVENUE <br /> TECH SEAVICES— SAN JOSE,CALIFORNIA 95112-1105 <br /> (408)573-7771 FAX <br /> T rr (408)573-0555 PHONE <br /> i A <br /> �n'D apC'ur <br /> August 2, 1999 <br /> Brett Hunter <br /> Chevron U S A Products Company <br /> P 0 Box 6004 <br /> San Ramon, CA 94583-0904 <br /> 2nd Quarter 1999 Monitoring at 9-1848 <br /> Second Quarter 1999 Groundwater Monitoring at <br /> Chevion Service Station Number 9-1848 <br /> 1257 Yosemite Avenue <br /> Manteca, CA <br /> Monitoring Performed on May 25, 1999 <br /> i <br /> Groundwater Sampling Repoi t 994525-G-2 <br /> This report covers the routine monitoring of groundwater wells at this Chevron facility Blame <br /> Tech Services, Inc work at the site includes inspection, gauging, evacuation, putgewatei <br /> containment, sample collection and sample handling in accordance with standard procedures that <br /> conform to Regional Watei Quality Control Board iequiiemlents <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 inatenal 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 /> Basic field infoririation is presented alongside analytical values excerpted from the laboratory <br /> report to 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 990525-G-2 2nd_O 1999 Monitoring at Chevron 9-1848 <br />