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6. Post-Reclamation Site Drainage <br />Water will drain from the irrigated pasture to the southwest of the mining area like it does <br />currently. Water will be captured in the southwest corner of the disturbed area with the use of a <br />berm until vegetation controls erosion. Since the pit floor will be reclaimed to irrigated pasture, <br />this will occur rapidly. Stormwater that is encountered on the north sloping fill slope on the <br />northern portion of the disturbed area will drain to the north. A silt fence or hay bails will be <br />installed at the toe of this fill slope as shown on Map F. The fence or bails will be removed once <br />vegetation is sufficient to control erosion. The other three slopes will sheet flow stormwater to <br />the irrigated pasture. <br />The irrigation ditches on the pit floor will receive irrigation water from a grouted channel <br />connecting to the irrigation ditches outside of the disturbed area. The grouted channel is needed <br />to get the irrigation water to the pit bottom without erosion. The grouted channel will be placed <br />on a 3H:1V slope as shown on Map F. The channel will be approximately 35 feet long and use 8 <br />cubic yards of concrete. Rock of 4" to 8" size will be placed in the channel to line it to a <br />thickness of 12". The channel will then be grouted with concrete. The final channel dimensions <br />are as fallows; 1.5 feet depth, 2.0 feet width, with 2H:1 V sideslopes. A concrete apron will be <br />placed at the bottom in the rangeland area. Energy dissipating rock of approximately 24" size <br />will be placed in the apron. The channel will be able to handle 3 cfs. The cross section and <br />profile are shown in Figure E-1. <br />Simmons Pit, March 2009 E-5