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% 1 <br /> BLAINS 1680 ROGERS AVENUE <br /> TECH SERVICES. SAN JOSE,CALIFORNIA 95112-1105 <br /> (408)573-7771 FAX <br /> (408)579-0555 PHONE <br /> October 14, 1999 <br /> Brett Hunter <br /> Chevron U.S.A. Products Company <br /> P.U. Box 6004 <br /> San Ranson, CA 94583-0904 <br /> 3rd Quarter 1999 Monitoring at 9-0557 <br /> Third QUW-ter 1999 Groundwater Monitoring at <br /> Chevron Service Station Number 9-0557 <br /> 139 South Center Street <br /> Stockton, CA <br /> Monitoring Performed 0n August 30, 1991) <br /> Groundwater Sampling Report. 990830-N-1 <br /> This report covers the routine monitoring of gl-oundwater 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 procccErn-es that <br /> conform to Regional Water Quality Control Board requirements. <br /> Routine field data collection includes depth to water, total well deptis, thickness of any separate <br /> immiscible layer, water column volume, calculated voiunle of a three-case volume purge, <br /> elapsed evacuation tinge, 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 exceil)ted fi-on1 the laboratory <br /> report in the cumulative table of WELL DATA AND ANALVTIC:AL RESULTS. The full <br /> analytical report for the nsost recent samples is located in the Analytical Appendix. The table <br /> also contains new groundwater elevation calculations taken 171"0111 the c011111uter plotted gradienl <br /> Blaine Tech Services, Inc Report No 990830-N-1 3rd-O 1999 Monitoring at Chevron 9-0557 <br />