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<, Letter to Anne Beierle -2- June 5. 1996 neutralizing potential, the Division's practice ie that materials with ANP:AGP ratios lees than 3:1 will be assumed to be acid generating, and would be subject to special handling to protect the material from the effects of weathering. However, the Division agrees that the acid-base accounting results should not be interpreted in isolation, but rather should be integrated with other geological and geochemical information for interpretation. 3. It ie stated in the work plan that if the total sulfur content of a sample ie found to exceed 0.16 percent, that the sample would then be analyzed for sulfur form. The Division assumes that the analysis for sulfur forme would be undertaken eo that sulfate sulfur and residual sulfur could be excluded from the acid-base account. Please be advised that it is the Division's position that, since laboratory digestions used to measure sulfide sulfur tend to result in an underestimate of sulfide sulfur, total sulfur determined by Leco Furnace ie an acceptable and conservative input to an acid- base accounting. 4. Please note that I have not commented on the regulatory aspects of the Henderson Mine fill which were targeted in your letter dated May 14, 1996. Rather, i have confined the scope of this letter to the work plan memorandum prepared by yourself and Craig Ford dated May 6, 1996. The regulatory aspects of the fill will be addressed separately. Please provide an addendum to the Henderson fill acid drainage work plan that addresses the enumerated issues (1, 2, and 3) in this letter. If you think that a meeting is needed to facilitate modification of the work plan, or if you have any questions, please contact me. Sincerely, j J;~. //f~ //~~ ~v v _ v A en C. Sorenson Reclamation Specialist cc: Harry Posey, DMG C:\YP51\HENDEPP4.TR