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COTTER CORPORATION <br />SCHWARTZWALDER MINE <br />SEMIANNUAL EFFLUEN REPORT <br />Appendix A <br />Solubility Classification for Environmental Air Samples <br />The solubility classifications used for comparison of Environmental Air Samples are taken from <br />the Rules and Regulations pertaining to Radiation Control of the Colorado Department of Public <br />Health and Environment, Part 4, Appendix B, Table 2 Effluent Concentrations. <br />For na`U, we use Class Y as recommended in Nuclear Regulatory Guide 4.14 Section 4 Page 4- <br />14.5. <br />For 232Th, we use Class Y since the uranium-zirconium ore is refractory and natural thorium <br />would be considered an oxide. <br />For 230Th, we use Class W for conservatism since alkaline tailings have been reported in <br />Department of Energy sponsored research to be approximately 30% Class W and 70% Class Y. <br />For 226Ra, use Class W since all forms are considered Class W. <br />For 21OPb, we use Class D since all forms are considered Class D. <br />E <br /> <br />33