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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.-T ris <br />Pond 012 - Proposer! - Design Confirmation <br />Sinee currently in place at New Horizon Mine. However, changes to the reclamation Dian have <br />altered the post mine drainage , <br />ease. The pre -mine r>� drainage area is 55.1 acres,while the post mine drains a area is 38.1 <br />acres. Therefore the pre mine drainage will continue to be the worst case,-andbe the basis forthe <br />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 />CN— C AREA <br />UNDISTURBED 80— C 12.152 Acres <br />DISTURBED 85— C 42.933 Acres <br />UVISED AUGUST 20W Attachment 2.05.3(3) -12 -3 <br />