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tf ' hli�y _. 1s1yl . ✓lam r/fd..=_ � - (•rl...i <br /> King Island Resort page 3 <br /> 11530 W . Eight Mile Rd , Stockton . <br /> CPT-3 is located near MW-7 and is in the area with the previously highest <br /> concentrations of petroleum in the ground water at the site. The MtBE in CPT-3 <br /> indicates that the vertical extent of ground water contamination in that area has not been <br /> determined . Additionally, it is not known what relationship exists between contamination <br /> at this depth and the potential for this contamination to reach the drinking water well for <br /> this facility. This potential must be addressed . <br /> MW-6 is the most down gradient monitoring well for this site and currently continues to <br /> detect the highest concentrations of MtBE at the site. Geotracker EDF data for the <br /> latest ground water sampling event, September 2006 , reported MtBE at 3300 ug/L in <br /> MW-6. MW-6 is a 'shallow' (first interface) monitoring well . The MtBE concentrations in <br /> MW-6 have been trending upward and the EHD has concluded that the plume is <br /> continuing to migrate northeasterly in the upper water bearing zone . With a consistent <br /> northeast ground water gradient direction recorded for this site (towards MW-6) , the <br /> extent of the dissolved plume continues to be undefined laterally. Further investigation <br /> is needed to define the lateral and vertical extents of MtBE at this site. <br /> An updated SCM , a work plan for investigation of the lateral and vertical extent of <br /> j the petroleum contamination , and a work plan to conduct an air sparge test are to <br /> be submitted to the EHD no later than January 19, 2007. A proposal for the bench <br /> scale test is to be submitted the CVRWQCB by January 19, 2007 and <br />'r correspondence copied to the EHD as well . <br /> i Please contact Michael Infurna at (209) 468-3454 if you have any questions. <br /> i <br /> Donna Heran , REHS , Director <br /> Environ ental Health Department <br /> Michael J . Infurna Jr. , Senior REHS Margaret tagorio, REHS <br /> LOP/ Site Mitigation Unit IV Program Coordinator <br /> MI/ <br /> cc: CVRWQCB — Jim Barton , Sacramento <br /> ATC — Dave Ashcom, 1117 Lone Palm Ave #B , Modesto, 95351 <br /> SWRCB-Clean Up Fund (CUF) Mark Owens, Sacramento <br /> f <br />