Laserfiche WebLink
i ~ • • <br />Based on these standards, a suggested schedule for further analyses is: <br />If gross alpha exceeds 10 pCi/1, a radium-226 analysis should be <br />performed. If radium-226 exceeds 3 pCi/1, a radium-228 analysis <br />should be performed. <br />While there are a number of arguments in favor of performing other <br />leach tests as suggested by Cotter, or performing leacfi tests <br />using weak solutions of nitric, sulfuric or phosphoric acids, or <br />using peroxides, the EP Toxicity Test is a legally defensible one. <br />If the leachate does not exceed these standards, impacts may to <br />considered not significant. If the leachate exceeds these quantities, <br />the impact on Ralston Creek needs to be considered." <br />Cotter Respnse <br />Please see section 6.0 in Appendix E-4. <br />GDH Comments (6) and (7) <br />"With what certainty is the uranium content of the waste rock known? <br />What is the range of uranium content? <br />It is suggested that you require Cotter to stockpile any ore with a <br />• uranium content of more than 0.05a in a separate area with an appro~~riate <br />pad, dusting, seepage, and leaching controls." <br />Cotter Response <br />Please see Cotter response to Pendleton comment #1. <br />As noted the average uranium content of the waste material at the erd of <br />the mine life is not expected to exceed 0.03Yo. It must be emphasized <br />that the assumptions used to prepare the response to Pendleton comment #1 <br />are very conservative due to the fact that as market conditions improve <br />the uranium content of sorter reject will be reduced. The basis for the <br />estimate of the average uranium content in the waste material is that <br />market conditions will not improve for the remaining mine life. Recent <br />market forecasts contradict this assumption. <br />• <br />