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BLAINE 1680 ROGERS AVENUE <br /> TECH SERVICES SAN JOSE CALIFORNIA 95112-1105 <br /> (408)573-7771 FAX <br /> tN7 �o (408)573-0555 PRONE <br /> • 2� y�� <br /> f <br /> April 8, 1999 <br /> Brett Hunter <br /> Chevron U S A Products Company <br /> P o Box 6004 <br /> San Ramon, CA 94583-0904 <br /> 1st Quarter 1999 Monitoring at 9-1848 <br /> First Quarter 1999 Gioundwatei Monitoring at <br /> Chevron Service Station Number 9-1848 <br /> 1257 Yosemite Avenue <br /> Manteca, CA <br /> Monitoring Performed on February 18, 1999 <br /> Groundwater Sampling Report 990218-R-1 <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, 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 Feld 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 /> McKittnck Waste Treatment Site for disposal <br /> Basic held 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 990248-R-1 1st-0 1999 Monitoring at Chevron 9-1848 <br />