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i bLAINE 1680 ROGERS AVENUE <br /> TECH SERVICES SAN JOSE CALIFORNIA 95112 <br /> (408)573-7771 FAX <br /> ��t4l (408)573 0555 PHONE <br /> r <br /> 0 <br /> SND DpCV <br /> July 6, 1998 <br /> Brett Hunter <br /> Chevron U S A Products Company <br /> P Q Box 6004 <br /> San Ramon, CA 94583-0904 <br /> 2nd Quarter 1998 Monitoring at 9-1848 <br /> Second Quarter 1998 Groundwater Monitoring at <br /> Chevron Service Station Number 9-1848 <br /> 1257 Yosemite Avenue <br /> Manteca, CA <br /> Monitoring Performed on May 20, 1998 <br /> Groundwater Sampling Report 980520-L-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, 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, 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 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 980524-L-2 2nd-0 1998 Wniloring at Chevron 9-1848 <br />