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JD-8 Mine Report <br />Geoscience Services <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. PORFLO W 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. PORFLOW was designed especially for <br />problems of fluid and mass transport in geologic media. <br />• Several features of PORFLOW aze especially important regarding the proposed <br />modeling simulations. First, data exist for the waste inventory and solubility of the <br />constituents of concern. These sources terms aze automatically input into the underlying <br />r. <br />unsaturated zone, transported to the regional aquifer based on hydraulic and retazdation <br />characteristics of the unsaturated zone, and then transported by the regional aquifer. <br />PORFLOW can simulate transport under partially or completely saturated 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 />waste forms, the amount of constituents of concern that aze being held in the unsaturated <br />zones, and the flux of constituents of concern entering the regional aquifer. <br />PORFLOW 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 selected time intervals. <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 />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 />Daniels Inc., Gaz de France (France), SAIC, Shell Oil, SOHIO, and Westinghouse <br />