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Pond 012 was initially designed for the 2000 Permit Amendment. The pond was constructed in <br />2007. The as built report is included in attachment 2.05.3(3) -13. Due to changes in the planned <br />post mine topography, Pond 012's post mine and pre mine drainage have to be compared. <br />Pond 012 - Design Confirmation <br />Pond 012 is currently in place at New Horizon Mine. However, changes to the reclamation plan <br />have altered the post mine drainage. The pre mine drainage area is 55.1 acres, while the post mine <br />drainage area is 38.1 acres. Therefore the pre mine drainage will continue to be the worst case,and <br />the design will remain unchanged. <br />Runoff Curve Number and Runoff <br />Project: POND 012 By: R. L. GUBKA <br />Location: NEW HORIZON MINE <br />Present <br />IDIF3911 :1*4 <br />CN (weighted): 84 <br />CF (weighted): 0.500 <br />2. Runoff <br />CN C AREA <br />80 C 12.152 Acres <br />85 C 42.933 Acres <br />Frequency ..............: 10 yr <br />Rainfall, P (24 -hour) ..: 2.00 in <br />Runoff, Q ..............: 0.74 in <br />Runoff Volume ..........: 3.39 Acre -Ft <br />Time of Concentration (SCS Method) <br />Curve Number: 84 <br />Length of Flow (ft): 1354.62 <br />Average Land Slope (): 6.40 <br />Time of Concentration (hrs): 0.23 <br />Revised January 2010 (PRO6) Attachment 2.05.3(3) -12 -2 <br />