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Quik Stop Station No 039 January 3, 2003 <br /> Stockton California Ouarterly Groundwater Monitoring Re ort <br /> methyl ether (TAME), tert-butanol (TBA), and 1,2-dichloro ethane (DCA) by <br /> Environmental Protection Agency (EPA) Method 8260B and Lead (Pb) by EPA 7421 <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 November 13, 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 A work plan has been conditionally approved by the San <br /> Joaquin County Environmental Health Department Quik Stop Markets has received <br /> coast pre-approval from the Underground Storage Tank Cleanup Fund The permit to f <br /> advance groundwater investigation borings has been applied for to the San Jouquine <br /> County Environmental Health Department The groundwater investigation is sc e uled <br /> for December 19 and 20, 2002 <br /> Geo-Tracker 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 in Attachment E <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 /> 7039gmr02Q4 doc <br /> Project No 7039 43 2 HORIZON ENVIRONMENTAL INC. <br />