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<br />* Rock taken from the ore sorter reject pile, and containing <br />• approximately .015% uranium or less, will also be stockpiled <br />at the waste dump at a rate of about 2000 tons per month. <br />Samples of sorter reject rock were collected and anal;/zed for <br />Radium226 leaching potential according to the method described <br />in Appendix E-1. The results of this laboratory analysis in- <br />dicate that under saturated conditions this rock, whi~:h will <br />comprise approximately 29w of the total waste dump volume, can <br />leach up to 100 pico Curries per liter. However, it must be <br />noted that the laboratory conditions under which the "leach tests <br />were conducted could not simulate field conditions in that the sorter <br />reject rock used in the lab was crushed to a size twenty times <br />smaller than the rock sizes normally found in the sori;er reject <br />pile, thereby increasing the total suface area of rocE: exposed <br />• to water. This is significant in that the radium leaching po- <br />tential from rock material is proportional to the surface area <br />exposed to ~•+ater. (see Appendix E-1) Therefore, undf~r satur- <br />ated conditions, the amount of radium leached from the sorter reject rock, <br />when mixed with non-uranium bearing rock in the waste dump, ~+ill be sig- <br />nificantly less than the radium leached under laboratory conditions. <br />The reclamation of the taaste dump will require the eartfcmoving and <br />grading operations discussed below. <br />1. A diversion channel will be constructed immediately upslope from <br />the top of the waste du?~p. (see Exhibit F) The diversion <br />channel has been designed to receive the maximum runoff from a <br />10-year, 24 hour precipitation event. <br /> <br />E-3 <br />