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JD-6 Mine Report <br />Geoscience Services <br />within every grid element, as well as for the entire flow domain. The storage terms are <br />approximated by a modified Newton-Raphson method {ACRi, 2000}. <br />The PORFLOW code is particularly well suited for simulating the transport of <br />fluid and constituents of concern through the underlying unsaturated zone, and into the <br />regional aquifer. PORFLOW can be used to simulate the release of constituents of <br />concern from the waste form (waste rock or ore stockpile) and the subsequent transport <br />• through the underlying geological media. PORFLO W was designed especially for <br /> problems of fluid and mass transport in geologic media. <br /> <br /> Several featwes ofPORFLOW are especially important regarding the proposed <br /> modeling simulations. First, data exist for the waste inventory and solubility of the <br /> <br /> constituents of concern. These sowces terms are automatically input into the underlying <br />• unsatwated zone, transported to the regional aquifer based on hydraulic and retardation <br /> characteristics of the unsaturated zone, and then transported by the regional aquifer. <br /> PORFLOW can simulate transport under partially or completely satwated conditions. <br />~ Second, PORFLOW can calculate contaminant flux values at any location in the problem <br /> domain. This feature allows the user to assess the flux of constituents of concern from the <br /> <br /> waste forms, the amount of constituents of concern that are being held in the unsaturated <br />• zones, and the flux of constituents of concern entering the regional aquifer. <br /> <br /> PORFLO W can simulate the decay of a radionuclide and up to three daughters in <br />• a conservative manner. Using the law of radioactive disintegration and the half-life input <br /> by the user, PORFLOW computes the remaining concentrations of the parent <br /> radionuclides and the subsequent increase and/or decrease in the daughters' <br />~ concentrations. The code maintains a mass balance of the initial radionuclide and the <br /> subsequent concentrations of the parent and daughters at seiected time intervals. <br /> <br /> PORFLOW has been extensively peer-reviewed {ACRi, 2000}. INEEL, Battelle <br /> Pacific Northwest, and Professor R. Allan Freeze of the University of British Columbia <br /> <br /> have formally reviewed PORFLOW and its derivatives. Additionally, it has been <br />• reviewed by ANDRA (France), Bae-SEMA (United Kingdom), British Petroleum <br /> (United Kingdom), Exxon Production Research, Failure Analysis Associates Inc., Fluor <br /> <br /> <br /> <br /> <br />