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717E 1680 ROGERS AVENUE <br /> TECH SERVICES.< SAN JOSE,CALIFORNIA 95112 <br /> (408)573-7771 FAX <br /> .�4�ax= nrrg4 A�� (408)573-0555 PHONE <br /> i 7 <br /> 13 <br /> �A r� <br /> - <br /> March 18, 1998 <br /> Brett Hunter <br /> Chevron U.S A- Products Company <br /> P.O. Box 6004 <br /> San Ramon, CA 94583-0904 <br /> 1st Quarter 1998 Monitoring at 9-1848 <br /> First Quarter 1998 Groundwater Monitoring at <br /> Chevron Service Station Number 9-1848 <br /> 1257 Yosemite Avenue <br /> Manteca, CA <br /> Monitoring Performed on February 10, 1998 <br /> Groundwater Sampling Report 980210-H-1 <br /> Tlus 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 field data collection includes depth to water, total well depth, thickness of any separate <br /> unmiscible 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 /> i <br /> Blaine Tech Services,Inc Report No 980210-H-1 1st-Q1998 Monitoring at Chevron 9-1848 <br />