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_ 16 of 16 <br /> COAL BASIN PERMIT WORKSHEET <br /> Requirements Time Est. <br /> Responsible Comments Required Cost S t <br /> 2, Describe the source and quality of waste to be stowed, area to Bill <br /> be backfilled, percent of the mine void to be filled, method of <br /> constructing underground retaining walls , influence of the backfill- <br /> ing operation on active underground mine operations , surface area <br /> to be supported by backfill , and the anticipated occurrence of <br /> surface effects following backfilling. <br /> 3. Describe the source of the hydraulic transport mediums , method of Bill <br /> dewatering the placed backfill , -retainment of water underground, <br /> treatment of water if released to surface streams , and the effect <br /> on the hydrologic regime. <br /> 4. Describe each permanent monitoring well to be located in the back- Doug plus groundwater consultant <br /> filled area, the stratum underlying the mined coal , and gradient <br /> from the backfilled area . <br />