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Former Beacon Station No 12419 July 29,2004 <br /> Stockton California Groundwater Monitoring Report <br /> • ethylbenzene and total xylenes (BTEX), and the fuel oxygenate methyl-t-butyl ether (MTBE) <br /> by Environmental Protection Agency (EPA) Method 8260B <br /> Groundwater Monitoring Results <br /> Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to <br /> calculate groundwater elevations Groundwater elevation data were used to construct the <br /> groundwater elevation contour map shown on Figure 2 The groundwater flow direction <br /> varies from northwestward to northeastward under a gradient of approximately 0 006 <br /> Groundwater analytical results are summarized in Table I Benzene concentration data from <br /> this sampling event were used to construct the benzene lsoconcentration map shown on Figure <br /> 3 The analytical report is contained in Attachment C <br /> GcoTracker Electronic Data Deliverables <br /> The analytical electronic data deliverable (EDD) is uploaded by Kiff The groundwater well <br /> measurement file EDD (GEO_WELL) for this quarterly monitoring event has been uploaded <br /> by Horizon The GEO_WELL file upload confirmation sheet is contained in Attachment E <br /> Recommendations <br /> The proposed remediation system piping and equipment compound have been installed by <br /> Ultramar Inc Final installation and start up of the remediation system is expected in August <br /> 2004 <br /> Report Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael Infurna Jr, Senior R E H S <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> Mr Marty Hertzell Mr Trung Nguyen <br /> Regional Water Quality Control Board 2350 Waterloo Road <br /> Central Valley Region Stockton, California 95205 <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670 <br /> 419gmr Q204 doe <br /> Project No 1419 47 2 HORIZON ENVIRONMENTAL INC. <br />