Laserfiche WebLink
Fortner Beacon Station No. 12474 October 29,2002 <br /> Stockton. California Quarterly GroguLwater <br /> ` California Department of Health Services-certified analytical laboratory (FLAP No. 2236) <br /> located in Davis, California. The samples were analyzed for total petroleum hydrocarbons <br /> as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and <br /> total xylenes (BTEX) and the fuel oxygenate methyl-t-butyl ether (MTBE) by <br /> Environmental Protection Agency (EPA) Method 826013. <br /> Results <br /> Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to <br /> calculate groundwater elevations. Groundwater elevation data, as summarized in Table 1, <br /> were used to construct the groundwater contour map as shown on Figure 2. The <br /> groundwater generally flows to the southeast across the site under a gradient of <br /> approximately 0.002. <br /> Groundwater analytical results are summarized in Table 1. Benzene concentration data from <br /> this sampling event were used to construct a benzene isoconcentration map as shown on <br /> Figure 3. Analytical reports and chain-of-custody documents are contained in Attachment <br /> C. Historical groundwater level and analytical data collected prior to 1998 are summarized <br /> in Tables 1 and 2 in Attachment D. <br /> iRecommendations <br /> Horizon recommends continued quarterly monitoring at the site. Horizon conducted <br /> fieldwork on October 8 and 9, 2002 to further delineate the extent of petroleum <br /> hydrocarbons in groundwater. The report describing the results of the additional delineation <br /> work is in preparation. <br /> GeoTracker Electronic Data Deliverables <br /> The analytical electronic data deliverable (EDD) is uploaded by Kiff. The groundwater well <br /> measurement file EDD for this quarterly monitoring event has been uploaded by Horizon. <br /> The GEO_WELL file upload confirmation sheets for this and the previous four quarters are <br /> contained in Attachment E. <br /> 474gmr02Q3.doc' <br /> Project No. 1474.45 2 HORIZON ENVIRONMENTAL INC. <br />