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Quik Stop Station No 039 June 19, 2002 <br /> Stockton California Quarterly Groundwater Monitoring Report <br /> ethyl-t-butyl ether (ETBE), tert-amyl methyl ether (TAME), tert-butanol (TBA), <br /> . methanol, ethanol, and the lead scavenger compounds 1,2-dichloroethane (DCA) and 1,2- <br /> dibromoethane (DBA)by Environmental Protection Agency (EPA) Method 8260B <br /> Results <br /> Depth-to-groundwater measurements were subtracted from the surveyed TQC 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 2 May 2002, Horizon <br /> transported the monitoring well purge water to InStrat, Inc in Rio Vista, California for <br /> disposal A payment receipt for acceptance of the purge water is contained in <br /> Attachment D <br /> Recommendations <br /> Historical groundwater analytical results indicated no reportable benzene or MTBE <br /> concentrations in the three site wells for the past ten quarters All site analytes have been <br /> analyzed for the past two quarters Horizon requests comments from the San Joaquin <br /> County Environmental Health Department regarding the suitability of the site for closure <br /> Report Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael J Infurria <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> P O Box 2009 <br /> Stockton, California 95201 <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 /> 7039gmro2Q2 doe <br /> Project No 7039 43 2 HORIZON ENVIRONMENTAL INC <br />