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11 <br />0 <br />El <br />� w <br />an <br />U -2 <br />89 <br />4 <br />LEGEND — <br />2 <br />P = 1.97in <br />Q = (P— Is)- 2 /(P +.8s) <br />Q = 0.773in. <br />A = 3.000ac <br />V = Q *A = 8,420.47cf <br />WASTE DUMP <br />TOPSOIL STOCKPLE <br />OREPAD <br />BASIN BOUNDARY � <br />BERM <br />DIVERSION SWALE m � I m <br />DITCH <br />SILT FENCE <br />RIPRAP <br />UPPER POND — BASIN U -1 <br />s = (1000 /CN) -10 <br />s = 1.628 <br />Is = 0.2s = 0.3256 <br />P = <br />wo <br />1.97in <br />Q <br />= (P— Is)- 2 /(P +.8s) <br />Q <br />= 0.826in <br />A <br />= 0.729ac <br />V = <br />QA = 0.826 *0.729 <br />V = <br />2,186.77cf <br />F B 13 2012 <br />GRAND JUM,; i RA f ILLL) OFFICE <br />DMSK)N OF <br />RECLAMATION MINING & SAFETY <br />N <br />80 40 0 80 <br />SCALE: 1 " = 80' <br />RIMROCK EXPLORATION & DEVELOPMENT <br />IBIRD MINE PERMIT 2005 -050 TECHNICAL REVISION C <br />REVISED DRAINAGE <br />DATE: 8/27/11 JAMES C. PIERCE, JR. <br />DRAWN BY: JCP, JR P.O. BOX 100 <br />NUCLA, COLORADO 81424 <br />SHEET 1 OF 1 (970) 864 -7455 <br />