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r RECEIVED 002 Emcon AssoclArEs June 4, 1992 Vonsuwtants in Waste Pro G67-0901 lanagemen,an,, .Jwromental Control Ms Jackie Doub Aegis Environmental, Inc 1050 Melody Lane, Suite 160 Roseville, California 95678 IRe Second Quarter 1992 Ground-water Monitoring Report, 4445 Pershing Avenue, Stockton, WIC# 204-7524-2408 ' Dear Ms Doub This letter report presents the results of the second quarter 1992 ground-water monitoring event for the Shell Oil Company (Shell) service station at 4445 Pershing Avenue, Stockton Monitoring at this site Is being conducted on a quarterly basis GROUND-WATER LEVEL SURVEY ' On April 21 , 1992, static water levels 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 Water-level measurements, ground-water elevations and monitoring well field data are presented in Table 1 SAMPLING AND ANALYSIS Ground-water samples were collected on April 21 , 1992 from monitoring wells I MW-1 MW-2, MW-3, and MW-4 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, I 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 our first quarter 1992 report Samples were cooled with ice packs and delivered, under chain-of-custody control, to NET Pacific analytical laboratory for analysis with the exception of the 6 sample intended for fecal coliform which was delivered to Sequoia Analytical Laboratory 1433 N Market Boulevard Sacramento Calltorma 95834 (916)928-3300