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imcon I ASSOCIATES March 20, 19/92 Consultants In Wase Project G67-06 01 Management and Environmental Control Mr Dave Poulsen I Aegis Environmental 1050 Melody Lane, Suite 160 Roseville, California 95678 Re First Quarter 1992 Ground-water Monitoring Report, 6131 Pacific Avenue, Stockton, WIC# 204-7525-0104 iDear Mr Poulsen: This letter report presents the results of the first quarter 1992 ground-water monitoring event for the Shell Oil Company (Shell) service station at 6131 Pacific Avenue, Stockton Monitoring at this site is being conducted on a quarterly basis. GROUND-WATER LEVEL SURVEY On February 26, 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 using an oil/water interface probe Water-level and ' floating hydrocarbon thickness measurements are presented in Table 1. SAMPLING AND ANALYSIS Ground-water samples were collected on February 26, 1992 from monitoring wells MW-1 and MW-2. A site map, including the monitoring well locations, is attached, as provided by Aegis. 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 bailer. The procedures used to purge and sample ground-water monitonng wells were detailed in our November 14, 1991 Proposal to Conduct Ground-water Monitoring for Shell Oil Company, and are attached for your information. ' Samples were cooled with ice packs and delivered, under chain-of-custody control, to a Shell-approved analytical laboratory for analysis. Monitoring well MW-3 contained floating hydrocarbons during this event and was not sampled for dissolved constituents. Floating hydrocarbon thickness ' measurements are presented in Table 1. ' 1433 N Market Boulevard Sacramento cavornta 95834 (q 16) 928 3300