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Vanadium concentrations exceeded State Agricultural Guideline. Since it is unlikely that <br />the arid region along the hillside where the mine portal is located will be farmed, <br />vanadium is not a concern. <br />There are significant radiological concerns at the site based on the gross alpha and radium <br />226 values in the SPLP tests. Radium concentrations are nearly 3 orders of magnitude <br />above drinking water standards. The likelihood of radium impacting groundwater <br />resources in the area has been discussed (section 8.0) and deemed minimal. However, all <br />necessary precautions should be taken to prevent runoff from waste rock areas from <br />leaving the site. This concern is addressed in the Drainage Design Plan found in <br />Appendix III. <br />14.2 Mobility of Detected Uranium Ore Related Constituents <br />Two factors control the mobility of constituents identified in the SPLP analysis - <br />precipitation and sorption. Limited precipitation in the area combined with high <br />evapotranspiration rates make it unlikely that sufficient precipitation is available to <br />mobilize ore related constituents any significant distances. The most likely scenario is <br />that any precipitation that falls in the area would be contained in the topsoil and used by <br />plants covering the waste -rock stockpiles once future mining and remediation is <br />completed. <br />The simplest and most common method of estimating contaminant retardation is based on <br />the partition (or distribution) coefficient, K The K parameter is a factor related to the <br />partitioning of a contaminant between the solid and aqueous phases. It is an empirical <br />unit of measurement that attempts to account for various chemical and physical <br />retardation mechanisms that are influenced by a myriad of variables. The Kd metric is the <br />most common measure used in transport codes to describe the extent to which <br />contaminants are sorbed to soils. A primary advantage of the Kd model is that it is easily <br />inserted into hydrologic transport codes to quantify reduction in the rate of transport of <br />the contaminant relative to groundwater, either by advection or diffusion. <br />The partition coefficient, Kd, is defined as the ratio of the quantity of the adsorbate <br />adsorbed per mass of solid to the amount of the adsorbate remaining in solution at <br />equilibrium. For the reaction <br />the mass action expression for K is <br />A + C, = A, <br />Kd = Mass of Adsorbate Sorbed (A, ) <br />Mass of Adsorbate in Solution (C; ) <br />O'Connor Design Group Inc. T - 21 <br />