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Abstract <br /> This manual presents a two-dimensional computer model, BIOPLUME II,that simulates the transport <br /> ' of dissolved hydrocarbons under the influence of oxygen-lirruted biodegradation BIOPLUME II also <br /> simulates reaeration and anaerobic biodegradation as a first order decay in hydrocarbon concentrations <br /> The mode[is based on the USGS solute transport two-dimensional code (Konikow and Bredehoeft, <br /> ' 1978) The model computes the changes in concentration over time due to convection, dispersion,mixing, <br /> and biodegradation The same numerical techniques that are used in the USGS code are maintained in <br /> BIOPLUME II <br /> ' BIOPLUME II solves the solute transport equation twice once for hydrocarbon and once for oxygen <br /> Asa result,two plumes are computed at every time step The model assumes an instantaneous reaction <br /> between oxygen and hydrocarbon to simulate biodegradation processes The two plumes are combined <br /> using the pnncaple of superposition <br /> ' The model is extremely versatile in that it can be used to simulate natural biodegradation processes, <br /> retarded plumes, and in-situ biorestoration schemes BIOPLUME II allows injection wells to be specified as <br /> oxygen sources into a contaminated aquifer This means that alternate methods for aquifer reclamation <br /> ' can be investigated to design the most economically feasible scheme <br /> The model provides three additional sources of oxygen into an aquifer initial dissolved oxygen in the <br /> uncontaminated aquifer, natural recharge of oxygen across the boundaries, and vertical exchange of <br /> ' oxygen from the unsaturated zone (reaeration) All three sources of oxygen can be used to simulate a <br /> contaminant plume that is being naturally biodegraded <br /> BIOPLUME II runs on an IBM PC/AT or compatible system A menu-dnven preprocessor was <br /> developed to assist the user in applying the model The preprocessor provides three options data input or <br /> data edit, performing a simulation run,and developing graphical output A graphics software program, <br /> SURFER, from Golden Software, Inc (1987),was selected to provide the user with contour and surface <br /> ' plots of hydrocarbon and oxygen concentrations and water table elevations <br />