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rl fr <br /> BLAINE1680ROGERSAVENUE <br /> TECH SERVICES SAN JOSE,CA 95112-1105 <br /> (408)573-7771 FAX <br /> (408)573-0555 PHONE <br /> Y <br /> �A'O D04U� <br /> February 5, 1999 <br /> Brett Hunter <br /> Chevron U S A Products Company <br /> P O Box 6004 <br /> San Ramon, CA 94583-0904 <br /> 4th Quarter 1998 Monitoring at 9-8632 <br /> Fourth Quarter 1998 Groundwater Monitoring at <br /> Former Chevron Service Station Number 9-8632 <br /> 575 Grant Line Road <br /> Tracy, CA <br /> Monitoring Performed on November 24, 1998 <br /> • <br /> Groundwater Sampling Report 981.124)-1 <br /> This report covers the routine monitoring of groundwater wells at this Chevron facility Blaine <br /> Tech Services, Inc 's 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, <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 McKittrick 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 981124-J-1 4th-Q 1998 Monitoring at Former Chevron 9-8632 <br />