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Skips Service (former) page 2 <br /> 300 S. California Street, Stockton <br /> 3. The groundwater gradient direction at this site has historically been to the northeast. <br /> The proposal to install MW-10 100 feet directly east of monitoring wells MW-8s/MW-8d <br /> may be too far to the south to intercept the extent of the groundwater contaminant <br /> plume estimated by your consultant and shown on the figure included in the work plan. <br /> In order to better investigate the northeast migration of the contaminated groundwater <br /> detected in monitoring wells MW-8s/8d, the EHD recommends that MW-10 be placed <br /> further to the north and closer to the estimated direction of the plume as depicted in the <br /> figure included in the work plan, <br /> 4. Elevated levels of benzene, toluene, ethylbenzene, total xylenes (BTEX) were detected <br /> in groundwater samples collected from CPT-6. The EHD requires the soil and <br /> groundwater samples collected from proposed MW-11 to be analyzed for BTEX. <br /> Please ensure that a revision to the work plan that addresses the items listed above is <br /> successfully uploaded to Geotracker for EHD review by December 9, 2009. <br /> You may contact Micha I Infurna at (209) 468-3454 if you have any questions. <br /> Michael J. Infurna Jr., HS Nuel Henderson Jr., P.G. <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. James Barton, CVRWQCB <br /> Mr. Michael Vlach, Foothill Engineering, 8442 Story Ridge Way, Antelope CA 95843 <br /> Mr. Mark Owens, SWRCB-Clean Up Fund <br />