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<br />Run-off from up-slope (watershed) areas will travel through diversion <br />he disturbed mine bench and em t into the meadow The d w <br />ditches around t p Y mea o <br />(alluvial valley) runs the length of Hay Gulch. Historically, cattle have <br />grazed here. Except for a few months each summer, the meadow is usually wet; a ' <br />natural drainage channel, the meadow drains run-off from all gullies,lincluding <br />the mine site and the upslope areas in Hay Gulch. I <br />NOTE: Only water from the up-slope areas diverted away Ifrom the <br />distrubed mine bench will be allowed to pass into the meadow. They proposed <br />settling pond sits at the junction of the mine bench and the meadow. <br />SURFACE HYDROLOGY: <br />The hydrology map depicts run-off patterns in the mine area. The <br />run-off from the up-slope is minimal. But, to channel the run-off that may <br />occur through the mine bench, diversion ditches are proposed. These will serve <br />as water conveyance systems and will empty into the proposed sedimenit pond. <br />• Topography controls the natural drainage systems within Hay Gulch, as ',it does <br />within the permit area. The fact that there are no gullies within the permit <br />area proves that BLUE FLAME COAL MINE is located in a watershed that is fairly <br />I <br />inactive. The proposed sediment pond (design approved) will be constructed to <br />I <br />prevent any water pollution that might occur due to run-off through the 4.1 <br />acres of disturbed area. It will be designed to meet the standards give (i.e., <br />adequate capacity to handle a ]Oyear-twenty four hour storm event). All <br />run-off that will not encounter the disturbed area will be allowed to percolate <br />naturally into the meadow below. <br />As mentioned earlier, the Hydrology Map shows proposed open channel <br />and pond construction. Undisturbed water percolates naturally into the meadow, <br />and disturbed water is diverted into the sedimentation pond. There should be <br />no effect on water quality in Hay Gulch attributable to the BLUE FLAME COAL <br />MINE, because the pond collects all disturbed water. The quality of this water <br /> will be monitored. Samples taken at the emergency discharge end of the pond <br /> will determine any change in quality of run-off. Water contained in the pond <br />• will not be discharged but allowed to evaporate. The pond will be a square <br />