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Quik Stop Station No 039 August 25, 2003 Stockton California uarterl Groundwater Monitoring Re ort methyl ether (TAME), tert-butanol (TBA), and 1,2-dichloroethane (DCA) by Environmental Protection Agency (EPA) Method 8260B Groundwater Monitoring Results Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to calculate static groundwater elevations Groundwater elevation data was used to construct a groundwater contour map (Figure 2) The groundwater flow direction for this sampling event was toward the south-southeast under a gradient of approximately 0 001 Groundwater analytical results are summarized in Table 1 Groundwater analytical reports and the COC document are contained in Attachment C On August 7, 2003, Horizon transported the monitoring well purge water to InStrat, Inc in Rio Vista, California for disposal A payment receipt for acceptance of the purge water is contained in Attachment D GcoTracker Electronic Data Deliverables The analytical electronic data deliverable (EDD) is uploaded by Kiff The groundwater well measurement file EDD for this quarterly monitoring event has been uploaded by Horizon The GEO_WELL, file upload confirmation sheet for this quarterly event is contained in Attachment E Recommendations Horizon recommends continuous quarterly monitoring during the ongoing investigation On February 26, 2003, Horizon submitted Results of the Additional Subsurface Evaluation and Work Plan Addendum dated February 14, 2003 Review and comment by the San Joaquin County Environmental Heath Department is pending Report Distribution We recommend a copy of this report be forwarded to Mr Michael J Infurna Jr , Senior R E H S San Joaquin County Environmental Health Department 304 East Weber Avenue, Third Floor P O Box 388 Stockton, California 95201-0388 • 7039gmr03Q3 doc Project No 7039 44 2 HORIZON ENVIRONMENTAL INC.