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<br />Memo - Mike Long <br />5 <br />6 <br />7 <br />April 24, 1992 <br />T.C. Shutt Letter to A. Douchane (April 13, 1992) <br />No comment. <br />Exhibit B <br />No comment. <br />Attachment 1. T.C. Shutt Letter to J. Pendleton (April 7, 199a> <br />a. Appendix I. Item 5-B. <br />Mr. Shutt should provide data to support statements like ~99% of the <br />WAD complexes at San Luis are Cu WAD," particularly when ollowing up <br />with such statements as "A metals analysis of the tailing at San Luis <br />suggests that the only WAD is that of copper." In general, the Cu <br />problem in the tailings has not been addressed in my opinion, and in a <br />recent meeting with Mr. Shutt, the matter of potentially igh Cu in the <br />tailings was avoided. The Division needs more informatio on what is <br />happening with the Cu research, and needs to be kept apprised of what <br />amounts of Cu are reporting to the tails. <br />b. Appendix III. <br />Mr. Shutt offers "BEI Report #1" to answer this inquiry. However, the <br />report is generally lacking in much of the ordinary scien ific <br />documentation that such a document should provide. In ge eral, it reads <br />more like promotional literature than an engineering repo t. Are we <br />allowing the MLRD permit to cover a large experiment, or re we allowing <br />the permit to apply to known technology? <br />I object to the representation that CyTox forms "insolubl <br />compounds that are stable across a wide range of pH while <br />neither Fe nor Zn to the ground water." The Division was <br />data on the stability of the Zn-Cn complexes and were giv <br />the composition of the fluids under which the various pH <br />Zn and Fe and CN are relatively common in nature, yet I k <br />natural compounds. I suggest, on general principles, tha <br />that precipitate may be somewhat stable under the conditi <br />(although we are not told what those conditions were) and <br />have data under actual conditions of the San Luis environ <br />taking quite a risk to allow the large amounts of cyanide <br />experiment to be locked up forever in solids that were in <br />recently. <br />ZnFe(CN) <br />ontributing <br />rovided no <br />no data on <br />sts were run. <br />w of no such <br />the solids <br />s measured <br />hat until we <br />nt, we are <br />n this <br />nted just <br />Intuitively, I believe I understand what is meant by "% c anide-kill." <br />However, given the importance of the diagrams that include this measure, <br />I would like to see it defined more rigorously. I would lso like to see <br />how "7. cyanide-kill" is measured and see validation on th se measures. <br /> <br />