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u <br /> Quik Stop Station No 039 October 14, 2002 <br /> Stockton California uarterl Groundwater Mon ttorm Re ort <br /> imethyl ether (TAME), tert-butanol (TBA), and 1,2-dichloroethane (DCA) by <br /> Environmental Protection Agency(EPA) Method 8260B <br /> Groundwater Monitoring Results <br /> Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations <br /> to calculate static groundwater elevations Groundwater elevation data was used to <br /> construct a groundwater contour map (Figure 2) <br /> Groundwater analytical results are summarized in Table 1 Groundwater analytical <br /> reports and the COC document are contained in Attachment C On August 22, 2002 <br /> Horizon transported the monitoring well purge water to InStrat, Inc in Rio Vista, <br /> California for disposal A payment receipt for acceptance of the purge water is contained <br /> in Attachment D <br /> Recommendations <br /> Horizon has prepared a work plan to delineate the vertical and lateral extent of <br /> groundwater DCA impact The work plan has been conditionally approved by the San <br /> . Joaquin County Environmental Health Department The estimated cost to perform the <br /> work has been prepared and submitted to Quick Stop Markets for review and eventual <br /> submission to the Underground Storage Tank Cleanup fund for cost pre-approval <br /> Report Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael J Infurna Jr, Senior R E H S <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> Mr Gordon Boggs <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> 7039gmr02Q3 doe <br /> Project No 7039 43 2 HORIZON ENVIRONMENTAL INC <br /> 1 <br />