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Former Beacon Station No 12419 June 29,2005 <br /> Stockton,California Groundwater Monitoring Report <br /> P <br /> toluene, ethylbenzene and total xylenes (BTEX), and the fuel oxygenate methyl-t-butyl ether <br /> (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 reap 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) was prepared and uploaded by Kiff The <br /> groundwater well measurement file EDD (GEO-WELL) for this quarterly monitoring event <br /> was prepared and uploaded by Horizon -The GEO_WELL file upload confirmation sheet is <br /> contained in Attachment E <br /> Recommendations - r <br /> 1 0 <br /> Horizon recommends continued quarterly monitoring during the period prior to startup of a <br /> vapor extraction system (VES) Installation of the proposed VES piping and equipment <br /> compound was completed during thirdquarter 2004 under San 3oaqutn Valley Air_Pollution _ <br /> Control District (APCD) Authority to Construct Permit (ATC) N-4910-1-0 Persistent <br /> --— - — operatmg�problems-expenenced-during-second-quarter-2005=prompted-a-decision-to-install- — --- <br /> different VES equipment _ Horizon is in the process of obtaining of modified ATC for the <br /> replacement equipment <br /> Report Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael Infurna Jr , Semor 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 /> 419gmr Q205 doe <br /> Project No 1419 48 2 HORIZON ENVIRONMENTAL INC. <br />