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7zr <br /> �f 4! <br /> y ' <br /> imCon <br /> ' ASSOCIATES March 19, 1992 <br /> Consultants+n Waste <br /> Project Gfi7-15.01 <br /> hAanagement aro <br /> Environmental Control <br /> Mr Brian Garber <br /> Aegis Environmental <br /> 1050 Melody Lane, Suite 160 <br /> Roseville, California 95678 <br /> ' Re First Quarter 1992 Ground-water Monitoring Report, 7910 Lower <br /> Sacramento Road, Stockton, WIC# 204-7524-0808 <br /> ' Dear Mr Garber. <br /> This letter report presents the results of the first quarter 1992 ground-water <br /> monitonng event for the Shell Oil Company (Shell) service station at 7910 <br /> Lower Sacramento Road, Stockton Monitoring at this site is bung conducted <br /> on a quarterly basis. <br /> GROUND-WATER LEVEL SURVEY <br /> On February 20, 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 20, 1992 from morntonng <br /> wells MW-1, MW-2 and MW-3 A site map, including the monitoring well <br /> locations, is attached, as provided by Delta Environmental. Ground-water <br /> monitoring wells were purged before sampling using a polyvinyl chlonde bailer, <br /> a low-flow submersible pump, or a Teflon@ bailer. Samples were collected <br /> using a Teflon bailer The procedures used to purge and sample ground-water <br /> monitoring wells were detailed in our November 14, 1991 Proposal to Conduct <br /> Ground-water Monitonng for Shell Oil Company, and are attached for your <br /> information <br /> Samples were cooled with ice packs and delivered, under chain-of-custody <br /> control, to a Shell-approved analytical laboratory for analysis. <br /> ' 1433 N Market Boulevard Sacramento Cahtorrna 95834 (916) 928-3300 <br />