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I <br /> � tit <br /> ou <br /> imcon <br /> ASSOCIATES March 19, 1992 <br /> Consultants in Waste Project G67-13.01 <br /> Management and <br /> Environmental Control <br /> Mr Mark Richards <br />' Aegis Environmental <br /> 1050 Melody Lane, Suite 160 <br /> Roseville, California 95678 <br /> Re First Quarter 1992 Ground-water Monitoring Report, 3725 Tracy Blvd., <br /> Tracy, WIC #204-7884-0901 <br /> IDear Mr. Richards: <br /> This letter report presents the results of the first quarter 1992 groundwater <br /> monitoring event for the Shell Oil Company (Shell) service station at 3725 Tracy <br /> Boulevard, Tracy Monitoring at this site is being conducted on a quarterly <br /> bass <br /> GROUND-WATER LEVEL SURVEY <br />' On February 14, 1992, static water levels were measured in all site wells before <br /> purging and sampling Water levels were measured to 0.01 foot using an <br /> oil/water interface probe. Water-level measurements are presented in Table 1 <br />' SAMPLING AND ANALYSIS <br /> Ground-water samples were collected on February 14, 1992 from monitonng <br />' wells MW-1A, MW-2A and MW-3A A site map, including the monitoring well <br /> locations, :s attached, as provided by Delta Environmental. Ground-water <br /> monitoring wells were purged before sampling using a polyvinyl chloride bailer, <br />' a low-flow submersible pump, or a Teflon® bailer. The procedures used to <br /> purge and sample ground-water monitoring wells were detailed in our <br /> November 14, 1991 Proposal to Conduct Ground-water Monitoring for Shell Oil <br />' Company, and are attached for your information. <br /> Samples were cooled with ice packs and delivered, under chain-of-custody <br />' control, to a Shell-certified analytical laboratory for analysis. <br /> 1 <br /> • <br /> I <br />' 1433 N Market Boulevard Sacramento California 95834 (916) 928-3300 <br />