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Former Beacon Station No 12474 March 28,2005 <br /> Stockton, California _ Quarterly Groundwater Monitoring Report <br /> total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, . <br /> toluene, ethylbenzene and total xylenes (BTEX), the fuel oxygenates methyl-t-butyl ether <br /> (MTBE), diisopropyl ether (DIPS), ethyl-t-butyl ether (ETBE), tert-amyl methyl ether <br /> (TAME), tert-butanol (TBA), methanol, ethanol, and the lead scavengers 1,2-dichloroethane <br /> - _ (DCA) and 1,2-dichloromethane (EDB) by -Environmental-Protection-Agency _(EPA)_ - <br /> 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, as summarized in Table 1, <br /> were=used=to=construct=the=groundwater=elevation=contour_map=shown=on=Figure=2 The <br /> groundwater flow direction in the dispenser island area varied from northeastward to <br /> eastward under a gradient of approximately 0 001 <br /> Groundwater analytical results are summarized in Table I Benzene concentration data were <br /> used to construct an isoconcentration map as shown on Figure 3 Analytical reports are <br /> contained in Attachment C Histoncal groundwater level and analytical data collected prior <br /> to 1998 are summarized in Tables 1 and 2 in Attachment D <br /> GeoTracker Electronic Data Deliverables <br /> The analytical electronic data deliverable (EDD) is uploaded by Kitf The groundwater well <br /> measurement file EDD (GEO_WELL) for this quarterly monitoring event was uploaded by <br /> Horizon The GEO_WELL upload confirmation sheet for this quarter is contained in <br /> Attachment E <br /> Discussion <br /> In February 2004, Horizon drilled and installed additional groundwater monitoring wells <br /> (MW-13 though MW-17) for the purpose of evaluating the extent of impacted groundwater <br /> conditions The report of the investigation is in preparation <br /> Installation of a vapor extraction system (VES) and an air sparging system was completed in <br /> late 2004 The San Joaquin Valley Air Pollution Control District issued a modified <br /> Authority to Construct permit in October 2004 Final equipment connections were made <br /> and final system preparations were performed during first quarter 2005 Final inspection, <br /> issuance-of[be Per7hil ta-Operate-androut ine--operation and-reportmg-nf-the-lv'ES <br /> expected during second quarter 2005 <br /> 474gmr Q105 doe <br /> Project No 1474 48 2 HORIZON ENVIRONMENTAL INC <br />