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1. Unger Cache Creek Basin (See Figure E-la) Mine Plan <br />Figure D--2-Upper Mine Plan Area <br />Figure D-31,ower Mine Plan Area <br />Drainage Area-Upper Basin 1.39 square miles (890 acres) <br />Hydraulic Gradient Distance 1.37 miles (7,340 ft.); <br />Upper Elevation= 12800 feet (ft.); <br />Lower Elevation= 12 100 ft. Gradient =9.67% <br />Rainfall 2 year-24 hour storm 1.5 in <br />CN= 60 -Runofflinch— 0 Peak Discharge = <cubic feet per second (5cfs) <br />Rainfall 5.._ near .,-24 hour storm 2.0 in <br />CN= 60 -Runoff(inch— .06 Peak Discharge = 6 cfs. <br />Rainfall 10 year-24 hour storm 2.6 in. <br />CN= 60 -Runofflinch— 0.2 Peak Discharge = 30 cfs. <br />Rainfall 25 -year-24 hoar storm 3.0 in <br />CN= 60 -Runoff(inch-0,33 Peak Discharge = 60 cfs <br />Rainfall 100 year -24 hour storm 4.2 in <br />CN= 60 -Runofflinch—.86 Peak Discharge = 225 cfs <br />2. Lower Cache,. Creek Basin fSee Figure E-la) <br />Drainage Area –Lower Basin 0.80 sq. miles (512 acres) plus upper basin 890 acres) <br />Total Acreage is estimated to be.] 402 acres <br />Hydraulic Gradient Distance 0.99 miles (5,230 feet) <br />Upper Elevation= 12,100 ft, <br />Lower Elevation= 11,700 ft. <br />Gradient =7.67 % <br />December 28, 2014 <br />Colorado Division of Reclamation Mining and Safety <br />Gold Basin Mine, Inc. <br />Gold Basin Mine <br />Granite, Colorado <br />