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Kd = Mass of Adsorbate Sorbed (Al ) <br />Mass of Adsorbate in Solution (C, ) <br />Where A = free or unoccupied surface adsorption sites, C, = total dissolved adsorbate <br />remaining in solution at equilibrium, and A = amount of adsorbate on the solid at <br />equilibrium. <br />Transport modeling simulations conducted at similar sites as JD -9 were conducted by <br />Kearl (2005). The modeling was very conservative and followed NRC guidelines for <br />high -level radioactive waste repositories. Using published uranium Kd values for <br />transport calculations in sand and clay materials, it was determined that after 1000 years, <br />the relative concentration of these at depths of less than 100 feet below the base of the <br />waste rock pile would be 1 /1,000,000 of the initial concentration. <br />14.3 Acid Mine Drainage Potential <br />As discussed in Section 6.1.1, there is a low potential for the development of acid mine <br />drainage from the waste rock or ore stockpiles due to the chemical nature of the rock <br />forming minerals. Salt Wash sandstones are commonly calcareous meaning that calcium <br />carbonate cements the sand grains together forming sandstones. Water percolating <br />through the waste rock or ore stockpiles would be expected to become alkaline due to the <br />rock chemistry of the rock. EPA Method 1312 (Synthetic Precipitation Leaching <br />Procedure) requires an acidic solution with a pH of 5.0 be used for the tests. <br />As shown by the SPLP test results, pH of the water solution passed through the rock <br />samples is 9.4 or alkaline. The waste rock acts as a buffer to acidic solutions. This result <br />is consistent with the rock chemistry and shows that there is no potential for waste rock <br />piles to form acid mine drainage. <br />(15) Construction Schedule Information <br />Ore and waste rock pile sites have already been constructed. The existing ditches, berms <br />and constructed containment ponds have proven effective in minimizing erosion of the <br />existing surface facilities. These structures are regularly monitored and maintained. <br />With the exception of a ditch and minor maintenance to existing berms and ditches, there <br />are no plans for any further construction at this site. <br />O'Connor Design Group Inc. U - 26 <br />