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!�* EM(On Associates 1433 North Market Boulevard • Sacramento California 95834-1943 • (916)928-3300 •Fax(916)928-3341 RECEIVED +� SEP 1719 September 17, 1992 Project G67-15 01 Mr Brian Garber Aegis Environmental 1050 Melody Lane, Suite 160 Roseville, California 95678 Re Third Quarter 1992 Ground-water Monitoring Report, 7910 Lower Sacramento Road, Stockton, WIC# 204-7524-0808 Dear Mr Garber This letter presents the results of third quarter 1992 ground-water monitoring for the Shell Oil Company (Shell) service station at 7910 Lower Sacramento Road, Stockton Well MW-2 is monitored on a quarterly basis Wells MW-1 and MW-3 are monitored on a semi-annual basis GROUND-WATER ELEVATION SURVEY On August 12, 1992, static water levels were measured in monitoring 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 No floating product was observed in the monitoring wells Total well depths were measured to 0 1 foot A summary of the monitoring well field measurment data including water-level measurements and ground-water elevations from this quarter's event and four previous monitoring events is presented in Table 1 SAMPLING AND ANALYSIS Ground-water samples were collected on August 12, 1992 from monitoring wells MW-1,MW-2, and MW-3 A site map, including the monitoring well locations, is attached, as provided by Delta Environmental The 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 our first quarter 1992 report