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Imcon August 4, 1992 <br /> ASSOCIATES Project G67-72.01 <br /> �onsullants m Waste <br /> Management ana <br /> rvironmental Controi <br /> Ms Laura Odenthal <br /> Aegis Environmental, Inc. <br /> 1050 Melody Lane, Suite 160 <br /> Roseville, California 95678 <br /> Re Third Quarter 1992 Ground-water Monitoring Report, <br /> Shell - 620 West Charter Way, Stockton, WIC#204-4878-0302 <br /> Dear Ms Odenthal: <br /> This letter report presents the results of the third quarter 1992 ground-water <br /> monitonng event for the Shell Oil Company (Shell) service station at 620 West <br /> Charter Way, Stockton, California Monitoring at this site is being conducted on <br /> a quarterly basis <br /> GROUND-WATER LEVEL SURVEY <br /> On July 10, 1992 static water levels and floating hydrocarbon thickness were <br /> measured in all site wells before purging and sampling. Water levels were <br /> measured to 0.01 foot from the top of the well casing using an oil/water interface <br /> probe Water-level and floating hydrocarbon thickness measurements, ground- <br /> water elevations and monitonng well field measurement data are presented in <br /> Table 1 Also presented in Table 1 are water level and floating hydrocarbon <br /> thickness measurements, and ground-water elevations from four previous <br /> monitonng events. <br /> SAMPLING AND ANALYSIS <br /> Ground-water sar*iples .were collected on July 10, 1992 from monitoring wells <br /> MW-1, MW-3, MW-5, MW-6,MW-7, MW-8, MW-9 and MW-10 Monitoring wells <br /> MW-2 and MW-4 contained floating product and therefore, were not sampled for <br /> dissolved constituents A site map, including the monitoring well locations is <br /> attached, as provided by Delta Environmental. Ground-water monitoring wells <br /> were purged before sampling using a polyvinyl chloride bailer, a low-flow <br /> submersible pump, or a Teflon@ bailer Samples were collected using a Teflon <br /> bailer. The procedures used to purge and sample ground-water monitonng <br /> wells were detailed in our November 14, 1991 Proposal to Conduct Ground- <br /> water Monitoring for Shell Oil Company, and are included for your information <br /> Wells MW-1, MW-3, MW-6, MW-8 and MW-9 were evacuated to dryness after <br /> the removal of fewer than three casing volumes. These wells were allowed to <br /> 1433 N Market Bouievard Sacramento California 95834 {9161 928 3300 <br />