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6/7/13 State.co.us Executive Branch Mail - North Thompson CreekMine C1981025 RN6 <br />Burgmaier - DNR, Susan <susan.burgmaier @state.co.us> Thu, Jun 6, 2013 at 4:31 PM <br />To: Brock Bowles - DNR <brock.bowles @state.co.us> <br />Cc: Alysha Hernandez - DNR <alysha.hernandez @state.co.us> <br />Per your request, I have reviewed the portion of the RN6 submittal that pertains to the substitution of an earthen <br />channel for the corrugated aeration pipe that conveys mine water discharge from the portals to Pond P -9. The <br />calculations provided indicate that the ditch capacity is adequate to convey the discharge at non - erosive <br />velocities. I would recommend approving the new ditch design. <br />Susan L. Burgmaier <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver CO 80203 <br />303 -866 -3567 x 8111 <br />http://mining.state.co.us <br />https: / /mail.g oog le.conVmai I /u /0 / ?ui =2 &i k= e29129fcb5 &�iev�-- pt &search =i nbox&th =13fl b9decOe57167 1 /1 <br />