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Converting inches to acre-feet: <br />2.25 inches water <br />Disturbed acreage = <br />0.]9 x 8.36 <br />to be contained in sediment pond. <br />0.19 acre-feet water <br />3.0 acres excluding road <br />surfaces not in disturbed area <br />.57 acre-feet water <br />The proposed settling pond's design is adequate to hold precipitation <br />from a ]0 year-24 hour storm. <br />Only .57 acre-feet of water will be diverted into the sediment pond. <br />Care has been taken to minimize disturbance of the normal hydrologic balance in <br />both the mine plan area and the adjacent areas, therefore, preventing any <br />adverse, long-term changes in the hydrologic balance. Post-mine land use will <br />be limited to cattle grazing. The land the mine plan occupies is entirely on <br />the upslope and sees little actual grazing. However, the location of the <br />diversion channels have been designed to minimize any adverse impact that might <br />• occur during post-mining land use of the permit area. <br />Changes in water quality will be monitored on a schedule to be set in <br />accordance with regulations and as required by the Department of Health's Water <br />Quality permit. <br />Disturbed areas will be stabilized by land shaping where it is <br />necessary. <br />The temporary diversions will be constructed to safely pass peak <br />runoff, as specified. Diversion ditches will be constructed of earth and will <br />be lined with country rock. <br />Anne Baldrige of the MLRD has provided help in the design of the <br />emergency spillway, sediment pond and diversion channels. These recommenda- <br />tions will be followed. See attached letter. <br />When no longer needed, (during reclamations), these temporary diver- <br />. sions will be refilled with original material to meet the requirements of 4.06, <br />4.14 and 4.]5. <br />