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toluene, ethylbenzene and total xylenes at levels as high as 15,000 ppb, 5,400 ppb, 2,700 ppb, 60 <br /> ppb, and 1,700 ppb, respectively Groundwater samples were below detection limits (ND) for <br />' lead in each well <br /> Groundwater r a n <br /> All six monitor wells were surveyed relative to each other and to mean sea level The static water <br /> level measured on May 15, 1992 ranged from 24 80 to 26 05 feet below mean sea level The <br /> groundwater flow direction was to the north northwest at a gradient of 0 0088 feet per foot <br /> Conclusions n Recommendationa <br /> Both groundwater and soil have been impacted by petroleum releases at this site Petroleum <br /> hydrocarbons have been detected an the soils in boring B-1 and In the groundwater in MW-3, MW- <br /> 4 and MW-6 Free product on top of the groundwater was observed an monitor wells MW-1 and <br />' MW-2 <br />' Based on the data, at appears the hydrocarbons may have migrated in the groundwater beyond the <br /> property boundaries south of MW-6 and east of MW-4 � <br /> Based on Artesian's understanding of the site conditions and State guidelines and regulations, <br /> remedial action will most likely be required to control and treat the impacted soils and groundwater <br /> on the property There are a variety of remediation alternatives that could be used on this site and <br /> the optimal solution should be based on the client's objectives, cost, and clean-up objectives <br /> negotiated with the regulators at the San Joaquin County Public Health Service/Environmental / <br />' Health Division, the lead regulatory agency Future work addressing the soil and groundwater <br /> clean-up issues will be included an the forthcoming Remedial Action Plan <br /> I <br /> av <br /> 100 Shoreline Hwy, Suite 295 B • Mill Valley, CA 94941 • (415)381-6456 FAX (415) 389-0423 <br />