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I 2.6 Summary ' BIOPLUME 11 simulates hydrocarbon transport under the influence of oxygen limited biodegradation A dual particle mover concept is used to compute an oxygen plume and a hydrocarbon plume An instantaneous reaction between the solute(hydrocarbon)and the substrate (oxygen) is assumed and the ' method of superposition is utilized to represent the reaction between the two An independent mass balance is performed for oxygen and hydrocarbon and is adjusted to account for the mass loss due to biodegradation ' The model can be used to simulate naturally occunng biodegradation processes and to simulate in- situ restoration processes Injection wells can be used as oxygen sources in the model Three other sources of oxygen are included in BIOPLUME II (1)dissolved oxygen in the aquifer, (2) natural recharge, ' and, (3) oxygen exchange fron the unsaturated zone The biodegraded mass in the model is most sensitive to hydraulic conductivity,the coefficient of reaeration, and the coefficient of anaerobic decay The model has be2n applied to two sites a wood ' creosoting process waste site in Conroe,Texas(Borden et al , 1986)and a tet fuel spill site in Traverse City,Michigan The model application to the Traverse City site is presently being submitted for publication The model provided a good match to field conditions at both sites BIOPLUME II is presently being used to design an in-situ bioreclamation field experiment at the Traverse City field site Results from the experiment will also be published in the literature Figure 2 t Simplified Flowchart of Bioplume 1l Figure 2 2 Schematic of the Centerline and Tranverse Section of a Plume Figure 2 3 Concentration Distributions for Various Values of Hydraulic Conductivity Figure 2 4a Vanation of Biodegraded Mass with Various Parameters. Figure,2 4b Variation of Biodegraded Mass with Various Parameters ' Figure 2 5 Concentration Distributions for Various Values of Retardation Figure 2 B Concentration Distributions for Various Values of Longitudinal Dispersivity ' Figure 2 7 Variation of Biodegraded Mass with Disporsivity Figure 2 8 Conrentrabon Distributions for Vanous Values of Transverse Dispersivity ' Figt-re 2 9 Concentration Distributions for Various Values of Porosity Figure 2 "g Ccncentrabon Distnbutions for Vanous Values of the Reaeration Coefficient i 1 2-6