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c <br /> Former Beacon Station No 12419 October 29,2003 <br /> Stockton California Groundwater Monitoring Report <br /> aromatic compounds benzene, toluene, ethylbenzene and total xylenes (BTEX), and the fuel <br /> aoxygenates methyl-tert-butyl ether (MTBE) by Environmental Protection Agency (EPA) <br /> Method 8021. and 8015 (modified) <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 was <br /> northwestward under a gradient of approximately 0 007 <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 cham-of-custody documents are contained in <br /> Attachment C <br /> GeoTrackcr 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 /> Horizon recommends continuation of quarterly monitoring according to the schedule <br /> proposed in the fourth quarter 2002 monitoring report Installation of the proposed <br /> remediation system is in progress <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 <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> 419gmrQ303 doc <br /> Project No 1419 46 2 HORIZON ENVIRONMENTAL INC. <br />