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Former Beacon Station No 12419 October 21, 2004 <br /> Stockton, California _ _ ___ _ Groundwater Monitoring Report <br /> w <br /> certified analytical laboratory (ELAP No 2236) located in Davis, California The samples <br /> were analyzed for total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic <br /> compounds benzene, toluene, ethylbenzene and total xylenes (13TEX), and the fuel oxygenate <br /> methyl-t-butyl ether (MTBE) 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 data indicate groundwater in the <br /> underground storage tank area flowed generally northward under a gradient of approximately <br /> 0 002 <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 report is contained in 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 /> Installation of the proposed remediation system piping and equipment compound was <br /> completed during the third quarter Start up of the remediation system is expected during the <br /> fourth quarter, 2004 <br /> i <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 /> James L L Barton 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 /> 4]9gmr Q304 doc <br /> Project No 1419 47 2 HORIZON ENVIRONMENTAL INC. <br />