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Quik Stop Station No 039 June 9, 2003 <br /> Stockton, California Quarterly Groundwater Monitorma Report <br /> . methyl 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) The groundwater flow direction for this <br /> sampling event was toward the south-southeast under a gradient of approximately 0 002 <br /> Groundwater analytical results are summarized in Table I Groundwater analytical <br /> reports and,the COC document are contained in Attachment C On May 2, 2003, 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 Attachment <br /> D p g ent <br /> GeoTracker Electronic Data Deliverables <br /> The analytical electronic data deliverable (EDD) is uploaded by Kiff The groundwater <br /> well measurement file EDD for this quarterly monitoring event has been uploaded by <br /> Horizon The GEO_WELL file upload confirmation sheet for this quarter event is <br /> . contained to Attachment E <br /> Recommendations <br /> Horizon completed the fieldwork for an investigation for delineation of the vertical and <br /> lateral extent of groundwater DCA impact in December 2002 Horizon recommends <br /> continuous quarterly monitoring during the ongoing investigation On February 26 <br /> 2003, Horizon submitted Results of the Additional Subsurface Evaluation and Work Plan <br /> Addendum dated February 14, 2003 Review and comment by the San Joaquin County <br /> Environmental Heath Department is pending <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 0 Box 388 <br /> Stockton, California 95201-0388 <br /> 7039gmr03Q2 doc <br /> Project No 7039 44 2 HORIZON ENVIRONMENTAL INC <br />