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EMCOfi Associates <br /> 1433 North Marxer Boulevard • Sacramento California 95834-1943 • (916)928-3300 • Fox(916)928-3341 <br /> • <br /> rRECEIVEU <br /> 1992 November 11 , 1992 <br /> Project OG67-072.01 <br /> Ms Laura Odenthal <br /> Aegis Environmental, Inc. <br /> 1050 Melody Lane, Suite 160 <br /> Roseville, California 95678 <br /> Re Fourth Quarter 1992 Ground-water Monitoring Report, <br /> Shell - 620 West Charter Way, Stockton, WIC#204-4878-0302 <br /> Dear Ms. Odenthal <br /> This letter presents the results of the fourth quarter 1992 ground-water <br /> monitoring event for the Shell Oil Company (Shell) service station at 620 West <br /> Charter Way, Stockton, California Monitoring at this site is conducted on a <br /> quarterly bass <br /> GROUND-MATER ELEVATION SURVEY <br /> On October 9, 1992 static water levels and floating hydrocarbon thickness were <br /> measured in all site wells before purging and sampling. Water levels and <br /> floating hydrocarbon thickness were measured to 0 01 foot from the top of the <br /> well casing using an oil/water interface probe A summary of the monitoring <br /> well field measurement data including water-level measurements, floating <br /> hydrocarbon thickness measurements, and ground-water elevations from this <br /> quarter's event and four previous monitoring events ,s presented in Table 1. <br /> SAMPLING AND ANALYSIS <br /> Ground-water samples were collected on October 9, 1992 from monitoring wells <br /> MW-1, MW-3, MW-5, MW-6, MW-8, MW-9 and MW-10 Monitoring well MW-2 <br /> contained floating product and therefore, was not sampled for dissolved <br /> constituents. Water levels were measured in monitoring wells MW-4 and MW-7 <br /> as requested. A site map, including the monitoring well locations is attached, as <br /> provided by Delta Environmental. Ground-water monitoring wells were purged <br /> before sampling using a polyvinyl chlonde bailer, a low-flow submersible pump, <br /> or a Teflon® bailer. Samples were collected using a Teflon bailer. The <br /> procedures used to purge and sample ground-water monitoring wells were <br /> detailed in our November 14, 1991 Proposal to Conduct Ground-water <br /> . Monitoring for Shell Oil Company, and were detailed in our second quarter <br /> report Wells MW-1, MW-3, MW-6, MW-8 and MW-9 were evacuated to dryness <br />