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*�'� <br /> 1 <br /> Emcon <br /> 1 ASSOCIATES June 12, 1992 <br /> Consultants in Waste Project G67-06 01 <br /> Management and <br /> IEnwromental Control <br /> Mr. Dave Poulsen <br /> 1 Aegis Environmental <br /> 1050 Melody Lane, Suite 160 <br /> Roseville, California 95678 <br /> 1 Re Second Quarter 1992 Ground-water Monitoring Report, <br /> 6131 Pacific Avenue, Stockton, WIC# 204-7525-0104 <br /> 1 Dear Mr. Poulsen• <br /> This letter report presents the results of the second 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 bass <br /> GROUND-WATER LEVEL SURVEY <br /> On May 12, 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 /> I 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 measurements <br /> Iand ground-water elevations from four previous monitoring events <br /> SAMPLING AND ANALYSIS <br /> Ground-water samples were collected on May 12, 1992 from monitoring wells <br /> MW-1 and MW-2. Well MW-3 contained floating hydrocarbons and was <br /> therefore not sampled for dissolved constituents A site map, including the <br /> I monitoring wail locations, is arlached, as provided by Aegis Environmental lilt, <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-water monitoring wells were detailed :n our November 14, 1991 <br /> Proposal to Conduct Ground-water Monitoring for Shell Oil Company, and were <br /> 6 included in our first quarter 1992 ground-water monitoring report. <br /> I <br /> 1433 N Market Boulevard Sacramento California 951334 (9W 928-3300 <br />