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Former Beacon Station No 12419 March 30,2004 <br /> Stockton,California Groundwater Monitoring Report <br /> toluene, ethylbenzene and total xylenes (BTEX), and the fuel oxygenates methyl-t-butyl ether <br /> (MTBE), dusopropyl ether (DIPS), Ethyl-t-buthyl ether (ETBE), tert-amyl methyl ether <br /> (TAME), and tert-butanol (TBA), methanol, ethanol, 1,2 dichloroethane and 1,2- <br /> dibromoethane 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 gradients from approximately 0 001 to <br /> 0 003 <br /> Groundwater analytical results are summarized in Table 1 Benzene concentration data from <br /> this sampling event were used to construct the benzene isoconcentration map shown on Figure <br /> 3 The analytical data reports and the chain-of-custody documents are contained in <br /> Attachment C <br /> GeoTracker 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 Installation of the electrical and natural gas utilities is pending Final <br /> installation and start up of the remediation system is expected during second quarter 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 Gordon Boggs 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 /> 419gmrQ104 doc <br /> Prosect No 1419 47 2 HORIZON ENVIRONMENTAL INC. <br />