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i <br /> I <br /> Quik Stop Station.No. 039 June 29, 2005 <br /> Stockton California° Quarterly Groundwater Monitoring Re ort <br /> (TAME), tert-butanol (TBA), . 1, <br /> 2-dichloroethane (DCA) and 1,2-dibromo ethane 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 eastward under a gradient of approximately 0.001. <br /> i <br /> Groundwater analytical results are summarized in Table 1. The groundwater analytical <br /> report is contained in Attachment C. I . On May . 13, 2005, Horizon transported the <br /> monitoring well purge water to InStrat,'Inc. in Rio Vista, California for disposal. Non- <br /> hazardous water transporuform and payment receipt for acceptance of the purge water are <br /> contained in Attachment D. <br /> GeoTracker Electronic Data Deliverables <br /> The analytical electronic data deliverable (EDD) is prepared by Kiff and uploaded by <br /> Horizon. The groundwater well measurement file- EDD for this quarterly monitoring <br /> event was prepared and uploaded by Horizon. The EDD confirmation sheets for this <br /> quarterly event are contained in Attachment E. <br /> Recommendations ' <br /> Horizon recommends continuous quarterly monitoring during the'ongoing investigation. <br /> On February 26,". 2003, Horizon .submitted Results of -the Additional' Subsurface <br /> Evaluation and Work Plan Addendum dated February. 14, 2003. Horizon received <br /> approval of the work plan from San Joaquin County Environmental Heath Department in <br /> -July 2004. Monitoring wells MW-4, MW-5 and MW-6 were installed in 'November <br /> 2004. The report on the installation of the additional wells is in preparation. <br /> Report Distribution <br /> s <br /> We recommend a copy of this report be forwarded to: .4 <br /> Mr. Michael J. Infurna Jr., Senior R.E.H.S. ' <br /> ,San Joaquin County Environmental Health Department i <br /> 304 East Weber Avenue, Third Floor <br /> P.O. Box 388 <br /> Stockton, California 95201.0388 g a <br /> 7039gini05Q2.doc <br /> Project No.7039.46 2 HORIZON ENVIRONMENTAL INC. <br /> i <br />