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ZMC0n Associates r �,5 c z -33 Norm Vcrket Souevarc • 5ccrc—erro Ccuforric vcK: IQ43 • (916)928-3300 • Fcx(916)928-3341 RECEIVED NOV 1 81992 Ans'd��.C.��-: November 16, 1992 Project OG67-006 01 Mr Dave Poulsen Aegis Environmental 1050 Melody Lane, Suite 160 Roseville, California 95678 Re Fourth Quarter 1992 Ground-water Monitoring Report, 6131 Pacific Avenue, Stockton, WIC# 204-7525-0104 Dear Mr Poulsen This letter presents the results of the fourth quarter 1992 ground-water monitonng event for the Shell Oil Company (Shell) service station at 6131 Pacific Avenue, Stockton Monitoring at this site :s conducted on a quarterly bans GROUND-WATER ELEVATION SURVEY On October 15, 1992, static water levels and floating hydrocarbon thickness were measured In all site wells before purging and sampling Water levels were measured to 0 01 foot from the top of the well casing using an oil/water interface probe A summary of the monitoring well field measurement data including water-level measurements and ground-water elevations from this quarter's event and four previous monitoring events is presented in Table 1. SAMPLING AND ANALYSIS Ground-water samples were collected on October 15, 1992 from monitoring wells MW-1 and MW-2 Well MW-3 contained floating hydrocarbons and was therefore not sampled for dissolved constituents. A site map, including the monitoring well locations, is attached, as provided by Aegis Environmental Inc. Ground-water monitoring wells were purged before sampling using a polyvinyl chloride baler, a low-flow submersible pump, or a Teflon® baler. Samples were collected using a Teflon bailer. The procedures used to purge and sample ground-water monitoring wells were detailed in our November 14, 1991 Proposal to Conduct Ground-water Monitoring for Shell Oil Company, and were included in our first quarter 1992 ground-water monitoring report.