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BLAINE <br /> ROGERS AVENUE <br /> TECH SERVICES.w SAN JOSE,CALIFORNIA 95112 <br /> (408)573-7771 FAX <br /> � EST mrd (408)573-0555 PHONE <br /> 9 <br /> �1y{ <br /> fj �C <br /> May 11, 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 9-4275 <br /> First Quarter 1998 Groundwater Monitoring at .� <br /> Chevron Service Station Number 9-4275 <br /> 2905 West Benjamin Holt Drive 5t1(g <br /> Stockton, CA <br /> Monitoring Performed on March 26, 1998 <br /> • <br /> Groundwater Sampling Report 980326-G-1 <br /> This report covers the routine monitoring of groundwater wells at this Chevron facility. Blame <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 m 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 980326-G-1 1 st-0 1998 Monitoring at Chevron 9-4278 <br />