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1 <br />' S.2 GEOCHEMICAL CHARACTERIZATION <br />Based on the information presented in Appendix B no additional geochemical characterization <br />is proposed to be conducted with this evaluation. The data from the hydrologic <br />characterization may be used in conjunction with the existing geochemical data to complete <br />additional modeling, as discussed below. <br />6.0 HYDROLOGIC AND GEOCHEMICAL EVALUATIONS <br />' Technical information and data developed from the proposed field investigatipn will be used <br />to assist further characterization of the West Pit area. Site specific hydraulic, hydrogeologic, <br />' and water quality data developed from the proposed pump tests and water quality analysis will <br />be used to develop: <br /> <br /> (1) construction of a potentiometric surface map detailing the magnitude and <br /> direction of ground water flow from the West Pit; <br /> (2) estimation of seepage velocities and resultant travel times from the West Pit to <br />' <br />3 the Rito Seco alluvium and surface channel; <br />t <br />th <br />d TDS <br />lf <br />t <br />ti <br />W <br />l <br />d <br />f <br />h <br />Pi <br />d <br />b <br /> ( <br />) eva <br />ua <br />e expecte <br />an <br />ate concen <br />e <br />su <br />ra <br />ons <br />rom t <br />e <br />est <br />t <br />ase <br /> on the use of a solute transfer model that simulates the effects of dispersion and <br />' travel times; <br /> (4) development of a spatial evaluation of water quality as it currently exists in and <br />' within the vicinity of the West Pit; <br /> (5) evaluate the effectiveness of using either backfill monitoring wells or pit <br />' perimeter monitoring wells as interceptor or injection wells as patt of a possible <br /> long-term implementation plan; <br />' (6) evaluate the volume of water and travel time required to move a pore volume <br /> through the West Pit; and <br />' (7) geochemically evaluate ground water monitoring data using either atime-series <br />evaluation or a computer model such as PHREEQC. <br />Ground and surface water hydro]ogic information developed from the various evaluations will <br />be used to evaluate and develop potential long-term strategies BMRI might select to contain <br />' and control elevated TDS and sulfate concentrations in the West Pit. <br />21 <br /> <br />