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t Quik Stop Station No 039 December 20, 2005 Stockton California Quarterly Groundwater Monttonn Report ' A, (TAME), tert-butanol (TBA), 1,2-dichloroethane (DCA) and l,2-dibromoethane (EDB) y 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 northward under a gradient of approximately 0 001 Groundwater analytical results are summarized in Table 1 The groundwater analytical report is contained in Attachment C On November 16, 2005, Horizon transported the monitoring well purge water to InStrat, Inc in Rio Vista, California for disposal Non- hazardous water transport form and payment receipt for acceptance of the purge water are contained in Attachment D GeoTracker Electronic Data Deliverables The analytical electronic data deliverable (EDD) file (EDF) was prepared by Kiff and uploaded by Honzon The groundwater level EDD (GEO_WELL) was prepared and uploaded by Horizon The laboratory analytical EDD and groundwater well measurement EDD (GEO_WELL) upload confirmation sheets for this quarter and the ; Quarterly Monitoring Report EDD (GEO_REPORT) upload confirmation sheet for the t previous quarter are contained in Attachment E Recommendations Horizon recommends continuous quarterly monitoring during the ongoing investigation Monitoring wells MW-4, MW-5 and MW-6 were installed in November 2004 The report on the installation of the additional wells was submitted to the San Joaquin County Environmental Health Department (EHD) on September 23, 2005 The EHD issued a letter dated October 26, 2005 with the results of the report review and a request for a work plan for additional groundwater investigation The work plan is in preparation Report Distribution We recommendea=copy-of-this-report be-forwarded-to Mr Michael J Infurna Jr , Senor R E H S San Joaquin County Environmental Health Department 304 East Weber Avenue, Third Floor Stockton, California 95202-2708 Mr James L L Barton California Regional Water Quality Control Board Central Valley Region 11020 Sun Center Drive, ##200 Rancho Cordova, California 95670 . 7039ginr05Q4 doc Project No 7039 46 2 HORIZON ENVIRONMENTAL INC.