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Former Beacon Station No 12419 January 6, 2005 ` <br /> Stockton California _ Groundwater Monitoring Report <br /> certified analytical laboratory (ELAP No 2236) located in Davis, Calltornta The samples <br /> were analyzed for total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic <br /> compounds benzene, toluene, ethylbenzene and total xylenes (BTEX), 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 roughly northwestward under a gradient of <br /> approximately 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 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 /> Installation of the proposed remediation system piping and equipment compound was <br /> completed during the third quarter Start up of the remediation system was attempted during <br /> the fourth quarter 2004-but"system problems-have-prevented-regulaf-operation—It-is expected <br /> that reg ular_operation_of the_remediation system will be achieved in January 2005_ <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, 9200 <br /> Rancho Cordova, California 95670 <br /> 419gmr Q404 doe <br /> Project No 1419 47 2 HORIZON ENVIRONMENTAL INC <br />