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�u I "**N InCr1vE AUGrift �� Imcon ASSOCIATES August 25, 1992 Consuilams n waste Project G67-05 01 Management and Environmental Control Ms Laura Odenthal Aegis Environmental, Inc. 1050 Melody Lane, Suite 160 Roseville, Cahfomia 95678 Re Third Quarter 1992 Ground-water Monitoring Report, Shell - 420 West Kettleman Lane, Lodi, WIC# 204-4416-0202 Dear Ms Odenthal This letter report presents the results of the third quarter 1992 ground-water monitoring event for the Shell Oil Company (Shell) service station at 420 West Kettleman Lane, Lodi Wells MW-1 and MW-3 are monitored on a quarterly basis. Well MW-2 will be monitored on an annual basis during fourth quarter 1992. GROUND-WATER ELEVATION SURVEY On July 13, 1992, static water levels were measured in wells MW-1 through MW-3 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 and four previous monitoring events is presented in Table 1 SAMPLING AND ANALYSIS Ground-water Samples were collected on August 13, 1992 from monitoring wells MW-1 and MW-3. Monitonng well MW-2 is scheduled to be monitored annually during the fourth quarter of 1992 A site map, including the monitoring well locations, is attached, as provided by Aegis Environmental Ground-water monitoring wells were purged before sampling using a polyvinyl chlonde bailer, a low-flow submersible pump, or a Teflon® bailer Samples were collected using a Teflon baler. 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 the first quarter 1992 monitoring report 1433 N Market Boulevard Sacramento California 95834 (916) 928 3300