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States Environmental Protection Agency through the Center for Exposure Assessment <br />Modeling, Athens, Georgia. The program was developed to model adsorptive <br />retardation and quasi-equilibrium speciation of most metals of environmental concern <br />and permits independent assignment of oxidation state to each of 25 redox pairs <br />among metals. For this project, the adsorptive routines were not used, and the model <br />was run as a full equilibrium model. The program is described in the EPA document <br />"MINTEQA2/PRODEFA2, A Geochemical Assessment Model for Environmental <br />Systems: Version 3.0 User's Manual" (Aa~son, et al., 19911. <br />The objectives of the modeling were: <br />Model the chemistry of waters associated with the proposed American <br />Tunnel bulkhead system <br />Establish in-situ water characteristics (reference water) and <br />compare to current mine drainage; <br />Project chemistry of water impounded behind deepest bulkhead of <br />the American Tunnel; and <br />Identify reactions likely to occur along flow paths. <br />P~lodel the chemistry of water associated with the proposed Terry Tunnel <br />bulkhead system <br />Model a reference water for the shallow mine levels; <br />Project chemistry of water impounded behind buikhead in the <br />Terry Tunnel; and <br />Identify reactions likely to occur along flow paths. <br />Model surface discharge of reference waters and mixed waters; and <br />Investigate the impact of discharge waters on surface water chemistry. <br />Details of the modeling are included in Appendix C of this report. This section <br />contains a summary of the results of the modeling. <br />~u~nvlwoln~ed2Y511Mr18911tp~ 59 <br />fl`.I SIf11011 HYDRO-SERRCH <br />