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Degradation, the reaction of oxygen with the hydrocarbon radical <br /> CH2 takes more oxygen by weight than hydrocarbons. <br /> CH2 + 02 _y CO2 + H2O <br /> 14 gm/mole -- 32 gm/mole = 0 .44 parts CH2 to 1 part 02 by weight . <br /> Assuming that the presence of oxygen is the driving force in <br /> the degradation, the oxgen infiltrating the soil should remove <br /> the following amounts of hydrocarbons <br /> Polygon TPH Total 02 TPH degraded TPH Final <br /> VSB13 129 .23 68 29 . 92 99 .31 <br /> VSB14 349 . 6 86 . 6 38 10 311 . 5 <br /> VSB15 52 .4 74 . 2 32 . 64 19 . 76 <br /> BIOPLUME, TWO-DIMENSIONAL CONTAMINANT TRANSPORT UNDER THE <br /> INFLUENCE OF OXYGEN LIMITED BIODEGRADATION IN GROUND WATER. <br /> In order to determine the influence of the above compounds <br /> impacts on ground water The ground water model Bioplume was used <br /> to model the influx of contaminate and the natural biodegradation <br /> occurring at the site. Bioplume is a modification of the USGS, <br /> Method-Of--Characteristics Solute-Transport Model, TTMOC" In <br /> addition to the contaminate transport, it simultaneously solves <br /> . the transport equations for dissolved oxygen. The basic <br /> assumption of the model is that any hydrocarbon in contact with <br /> dissolved oxygen will biodegrade until it has used all available <br /> oxygen. Bioplume is available from the Center for Subsurface <br /> Modeling Support, Robert S Kerr Environmental Research <br /> Laboratory, US EPA, P O Box 1198, Ada, OK 74820 . <br /> From examination of the boring logs and the results of our prior <br /> slug test some basic assumptions were made about the site <br /> The boring logs indicates a sand lens or lenses exist on the site <br /> running from MW6 in the Northwest side of the site Southeast <br /> through MWS and South through MW7, see figure 2 . This lens or <br /> lenses are surrounded by an area of silty, sandy clay. <br /> The model was run with the following assumptions, based of field <br /> test . <br /> Hydraulic Conductivity (K) lens = 0 0002 ft/sec, slug test MW5 . <br /> K silty sandy clay = 0 . 00002 ft/sec, slug test . <br /> Thickness aquifer (h) = 10 feet . <br /> Original Hydrocarbon Concentration = 0 ppm <br /> Original Dissolved Oxygen = 8 ppm <br /> Period of contaminate impact = 100 years . <br /> Gradient from 02/16/94 = 0 . 004 to the north <br /> In order to model the impact of the three contaminate polygons <br /> from VLEACH, three very low rate contaminate injection wells were <br />