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move time step The chemical balance output also provides the user with the amount of mass loss due to <br /> ' reaeration and anaerobic decay <br /> It should be mentioned that the model can be used to simulate plumes without biodegradation terms <br /> The user would have to set all the oxygen sources in the model to zero The output for the oxygen plume is <br /> ' not suppressed Instead, a null plume for oxygen is printed <br /> 2.1.1 Incorporated Revisions of the USGS MOC Code <br /> The USGS MOC Code has been modified several times since it was first introduced The following <br /> changes (referred to by date) have been incorporated in this version of BIOPLUME II <br /> May 16, 1979 <br /> March 26, 1980 <br /> August 26, 1981 <br /> October 12, 1983 <br /> ' June 10, 1985 <br /> July 26, 1985 <br /> July 31, 1985 <br /> August 2, 1985 <br /> ' August 8, 1985 <br /> August 12, 1985 <br /> Future revisions to the USGS MOC Code will be incorporated and released as upgraded versions of <br /> BIOPLUME II <br /> 21 2 Code Verification <br /> The accuracy of a numerical solution is usually evaluated by comparing the results from the numerical <br /> solution to the results from an analytical solution for a particular problem The USGS MOC code has been <br /> compared to several analytical solutions and the user is referred to the documentation on the code for <br /> ' more details (Konikow and Bredehoeft, 1978) <br /> 2 2 Program Capabilities <br /> BIOPLUME li is designed basically to handle two different types of simulations <br /> 1) Simulation of a hydrocarbon plume that is being naturally biodegraded <br /> 2)Simulation of in-situ biorestoration schemes by injecting oxygenated water into the contaminated <br /> aquifer <br /> The model also has the capability to simulate anaerobic biodegradation and reaeration as a first order <br /> decay in HC concentration <br /> 2 21 Simulation of Naturally Occurring Biodegradation <br /> ' The basic data requirements for this type of simulation would be the physical parameters for the <br /> aquifer and some information about the amount of oxygen available in the aquifer prior to contamination <br /> BIOPLUME It simulates four sources of OZ in the aquifer <br /> 1) Initial Oxygen Concentration The initial OZ concentration refers to the dissolved oxygen <br /> available in P <br /> thea aquifer nor to contamination This value is obtained by performing adissolved <br /> q <br /> oxygen measurement in the field from a pristine or uncontaminated zone The background Oz <br /> ' value is input in the array CONC1 (Data Set 10, Appendix A) <br /> ' 2`2 <br />