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JI-t Emcan Associates 433 North Market Boulevard •Sacramento Caiifomsa 95834 1943 • (916)928-3300 • Fax(916)928-3341 October 22, 1992 Project OG67-005 01 RFCEIVE1) Ms Laura Odenthal Aegis Environmental, Inc ! ' 2 1050 Melody Lane, Suite 160ns'� ,1fj Roseville, California 95678 Re Fourth 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 fourth 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 bans Well MW-2 is monitored on an annual basis during fourth quarter GROUND-WATER ELEVATION SURVEY On October 15, 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 October 5, 1992 from monitoring wells MW-1 through MW-3 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 chloride bailer, a low-flow submersible pump, or a Teflon® bailer 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 the first quarter 1992 monitoring report.