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1 <br />II ' As discussed in Exhibit D, the site will be wet mined and is expected <br />i ~ to have negligible impact on the ground water system. <br />~ Stormcvater Control <br />' There will be no stormwater discharge from disturbed areas. As such, <br /> a st:ormwater permit from the Colorado Department of Health, Water Quality <br /> Control Division, is unnecessary. A berm is present along the southern <br />t part. of the site area between the mining area and the stream. The east <br /> part of the berm was constructed many years ago; the remaining part is <br />' formed during mining and consists of an unmined area left on the south side <br /> of the pond. This results in a large, six to 10 foot deep depression where <br />' the ponds are contained and serves to isolate surface runoff on site. <br /> Stormwater runoff from the disturbed portions of the mining area will flow <br /> <br /> to the ponds. If necessary, small local diversion ditches will be field <br />engineered as required to route any surface flow from disturbed areas to <br />the ponds. <br />' Stormwater runoff from the industrial area is routed southward by a <br />ditch and existing surface topography to a containment basin located on the <br />1 south side of the site. Surface flow from the small area south of the pond <br />t is also directed back to the pond because the elevation on this part of the <br />site is higher than at the pond. <br />' Gravel Washing <br />Gravel is washed when concrete aggregate is needed. A portable wash <br />' plan~_ is located on site and is used in conjunction with crushing and <br />' screening. Water for the plant is pumped from the pond and then recycled <br />back to the pond. This technique eliminates a discharge from the pond. No <br />' chemicals are used in the washing process. <br /> <br />1 <br />