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T <br /> I <br /> Imcon . _ �.._..._....� r <br /> ASSOCIATES August 4, 1992 11 <br /> Consultants in Waste Protect G67-06.01 �- <br /> Management and <br /> Environmental Control <br /> Mr Dave Poulsen <br /> Aegis Environmental <br /> 1050 Melody Lane, Suite 160 <br /> Roseville, California 95678 <br /> Re Third Quarter 1992 Ground-water Monitoring Report, <br /> 6131 Pacific Avenue, Stockton, WIC# 204-7525-0104 <br /> Dear Mr. Poulsen: <br /> This letter report presents the results of the third quarter 1992 ground-water <br /> monitoring event for the Shell Oil Company (Shell) service station at 6131 <br /> Pacific Avenue, Stockton. Monitoring at this site is being conducted on a <br /> quarterly basis <br /> GROUND-WATER LEVEL SURVEY <br /> On July 8, 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 monitoring well field data are presented in Table 1. Also <br /> presented in Table 1 are water-level and floating hydrocarbon thickness <br /> measurements and ground-water elevations from four previous monitoring <br /> events. <br /> SAMPLING AND ANALYSIS <br /> Ground-water samples were collected on July 8, 1992 from monitoring wells <br /> MW-1 and MW-2. Well MW-3 contained floating hydrocarbons and was <br /> thormfvre not samplvd for diVVolred M-tituents. A ."lite map, including the <br /> monitoring well locations, is attached, as provided by Aegis Environmental Inc. <br /> Ground-water monitoring wells were purged before sampling using a polyvinyl <br /> chloride bailer, a low-flow submersible pump, or a Teflon® bailer. Samples <br /> were collected using a Teflon bailer The procedures used to purge and <br /> sample ground- ter monitoring wells were detailed in our November 14, 1991 <br /> Proposal to Conct Ground-water Monitoring for Shell Oil Company, and were <br /> included in our first qutirter 1992 ground-water monitoring report. <br /> 1433 N Market Boulevard Sacramento camorrna 95834 (916) 928-3300 <br />