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BLAINE 98DRIVE <br /> SANNJOSE, <br /> CA 95133 <br /> (408) 995-5535 <br /> TECH SERVICES INC. FAX (408) 293-8773 <br /> t <br /> +� March 27, 1995 <br /> Brett Hunter <br /> Chevron U.S.A. Products Company <br /> P.O. Box 5004 <br /> San Ramon, CA 94583-0804 <br /> 1st Quarter 1995 Monitoring at 9-0557 <br /> First Quarter 1995 Groundwater Monitoring at <br /> Chevron Service Station Number 9-0557 <br /> 139 South Center Street <br /> Stockton, CA <br /> Monitoring Performed on February 24, 1995 <br /> Groundwater Sampling Report 950224-Y-2 <br /> This report covers the routine quarterly monitoring of groundwater wells at this Chevron facility. <br /> Blaine Tech Services, Inc.'s work at the site includes inspection, gauging, evacuation, <br /> purgewater containment, sample collection and sample handling in accordance with standard <br /> procedures that 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 Chevron's Richmond Refinery 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. 950224-V-2 1 st 0-1995 Monitoring at Chevron 9-0557 <br />