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5 <br /> BLAINS 1880 ROGERS AVENUE <br /> SAN JOSE,CALIFORNIA 95112-1105 <br /> TECH SERVICES— (408)573-7771 FAX <br /> (40$)573-0555 PHONE <br /> �Cr <br /> e <br /> �iyp �c1 <br /> September 24, 1999 <br /> Brett Hunter <br /> Chevy on U S A Pt oducts Company <br /> P o Box 6004 <br /> San Rai-non, CA 94583-0904 <br /> 3rd Quarter 1999 Monitoring at 9-1848 <br /> Thud Quarter 1999 Groundwater Monitoring at <br /> Chevron Service Station Number 9-1848 <br /> 1257 Yosemite Avenue <br /> Manteca, CA <br /> • Monitoring Perfomned on August 11, 1999 <br /> Groundwater Sampling Report 990811-R-3 <br /> This report covers the routine monitoring of groundwater wells at this Chevron facility Blaine <br /> Tech Services, Inc work at the site includes inspection, gauging, evacuation, purgewatei <br /> containment, sample collection and sample handling in accoidatice with standard piocedutes 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 sepal ate <br /> immiscible layer, water column volume, calculated volume of a three case volume purge, elapsed <br /> evacuation time, total volume of water i emoved, and standard water parameter Instrumetit <br /> readings Sample material is collected, contained, stored, and transpoited to the laboratory in <br /> conformance with EPA standards Purgewater is, likewise, collected and transported to <br /> 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 gioundwater elevation calculations taken from the computc, plotted gradient <br /> map which is located in the Professional Engineering Appendix <br /> Blaine Tech Services Inc ReportNo 99D811-R-3 3rd-O 1999 Monitoring at Chevron 9-1848 <br />