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J -Birds Mine 110(d) Permit M- 2005 -050 Technical Revision 02 <br />b. Two detention ponds, an Upper and a Lower, have been, or are in the process, of being <br />completed. The Lower Pond construction is complete and additional reinforcement of the <br />pond banks is being installed. The Upper Pond construction is approximately 75% <br />completed, with the pond containment currently sufficient in volume to contain the 10- <br />year 24 -hour storm event. The Upper Pond construction is proceeding in accordance with <br />an approved construction schedule that includes the placement of relatively inert waste <br />rock brought during excavation from of the underground workings as pond construction <br />material. <br />c. A surface water drainage and detention pond capacity analysis for the 10 -year 24 -hour and <br />100 -year 24 -hour storm events is included as Attachment 4 "Surface Water Management <br />and Controls Analysis" to this revision. <br />Rimrock Exploration & Development <br />Page 4 of 4 <br />