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-2- 3. Stipulation 115 (Sediment pond design). Trapper is providing the original P.E. certification as requested by MLR. With receipt of thi.=. information, the issue is resolved. 4. Stipulation 1112 (Fly ash disposal). Discussion of Dave Craig's June 15, 1982 memo occurred. Utah stated that the predictive model employed to determine the post-mining potentiometric. surface was the "full bathtub" model, and that this was the worst case situation. Calculations indicate that a 10-foot buffer zone above this surface is sufficient. MLR agreed to the. worst case situation and 10-foot buffer, providing Utah's calculations (to be provided) demonstrate the adequacy of the buffer. Much discussion occurred on the stream buffer zone for fly ash placement. In summary, the Division can reduce the required buffer zone to 50 feet either side of the reconstructed drainage if U.I. can provide more specificity with regard to actual siting of the reconstructed stream. The Division believes that the siting of the reclaimed stream channels should be finalized prior Co mining occurring within the buffer zone. The Division interprets the buffer zone to commence 700' from any existing stream channel. Considerable discussion ensued regarding this interpretation. Jim Pendleton suggested that, if the final stream location could not be determined at this time, a commitment to complete the determination prior to entering the 700' buffer would be acceptable. Utah will consider this option. An agreement was reached on pit floor ash disposal. Pit floor ash dispoe~al is acceptable for the Enfield pit. Pit floor ash disposal is acceptable for the Derringer pit given that Utah will provide a map (of D pit disposal areas), monitoring wells, and incorporation of D pit specifics into the disposal plan. Pit floor ash disposal may not occur in Ashmore pit. Ash disposal in Ashmore pit may occur 10 feet above the pit floor and 5 feet below the regraded surface. The 9:1 ratio is operationally unfeasible to achieve, therefore, this; point was agreed to be moot. The contents of the waste disposal plan were discussed. Utah will submit revised/additional pages on this subject. 5. Stipulation 1113 (Municipal waste disposal). 'ILRD is reconsidering the U.I. plan as presented. Division decision to approve or modify wi71 be issued in one week. Utah will submit language indicating limit nr quantity of municipal waste placed at northern end of the pits. Stipulation 1114 (Ground water monitoring). Utah submitted the eva]uation of samples at the industrial waste pond. Preliminary evaluation by the Division indicates this issue is resolved.