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• RECEIVED Aug Z S 1992 Ans ` amcon ASSOCIATES August 25, 1992 Consultants m waste Project. G67-09 01 Management ann EnyrconmBntal Control Ms Jaclue Doub Aegis Environmental, Inc 1050 Melody Lane, Suite 160 Roseville, California 95678 Re Third 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 third quarter 1992 ground-water monitoring event for the Shell 01 Company (Shell) service station at 4445 Pershing Avenue, Stockton Monitoring at this site is bung conducted on a quarterly basis GROUND-WATER ELEVATION SURVEY On July 13, 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. A summary of 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 July 13, 1992 from monitoring wells MW-1 MW-2, MW-3, and MW-4 A site map, including the monitoring well locations (MW-4 not included), ,s 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 011 Company, and were included in our first quarter 1992 report. Quality Control samples for third quarter 1992 monitoring included a trip blank, field blank and a duplicate well sample (labeled X-Dup). The duplicate sample was collected from monitoring well MW-1. 1433 N Market Boulevard Sacramento camornia 95834 (916) 928-3300