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• ~ • III ~fl~lllff'lll I1f Cotter Corporation ~ General Offiee Mr. Robert C. Campbell Colorado Division of Natural Mined Land Reclamation 723 Centennial Building 1313 Sherman Street Denver, Colorado 80203 D I A L 3 0 3- 2 3 2- 8 2 1 8 9305 WEST ALAMEDA PApNW AY SUITE 201 LAKEWOO D. COLORADO 00226 September 24, 1979 r SEP Z 4 1919 Resources ColoNp~ SAND RfCLAMgTIQM pt• o~ Natural gesources Re: File No. 79-94 Dear Mr. Campbell: Cotter Corporation submits herewith responses to questions and concerns expressed by staff members of the Mined Land Reclamation Board. These questions and concerns are set forth below, followed by the pertinent response. 1. In Cotter's letter to you, dated September 12, 1979, responses to a series of hydrologic questions were deferred until the completion of a report prepared by an independent consulting hydrologist. These deferred ques- tions and concerns pertain to the following: (a) A description of the premising hydrologic conditions; (b) Groundwater conditions as they pertain to pit inflow; (c) A discussion of the postmining hydrology of the backfilled open pit; and (d) A summary of the effect of the operation on the hydrologic balance. The attached discussion from Zorich-Erker Engineering, Inc., answers these concerns. 2. The response set forth below addresses the concern expressed at the August 27 meeting between representatives of Cotter and the MLR staff, and is listed as item number 7 in the previously submitted summary of that meeting. In response to recent communications between Cotter, the Colorado Air Pollution Control Division, and the Air Programs Branch of the E.P.A., regarding air emission permits, Cotter has filed with ttie state and the E.P.A., respectively, dust emission calculations and a dust management policy statement, both of which obligate Cotter to the use of a chemical soil binder for road dust emission control.