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1/25/2016 <br />State.co.us Executive Branch Mail - Fwd: Revised sed report <br />STATE, OF Hernandez - DNR Alysha <alysha.hernandez@state.co.us> <br />� �O L, R�'AI O ' <br />Alysha, please file this under SL -03 for Southfield. <br />1 Zuber, P.E. <br />EnYW,chmemul f- «;- <br />Coat Regutatory Program <br />P 303.366.3567, extension 3113 1 F 303.33203106 <br />1313 Sherman Street, Room 215, Denver, CO80203 <br />rob.zuber@state.co.us I http://mining. state. co. us <br />---------- Forwarded message ---------- <br />From: W D Corley, Jr. <ajjc@att.net> <br />Date: Thu, Jan 21, 2016 at 1:12 PM <br />Subject: Revised sed report <br />To: Rob Zuber - DNR <rob.zuber@state.co.us>, Allen Weaver <alweaverefci@gmailocom> <br />Rob and Al, <br />have spent a few minutes reviewing the revised sediment report (rev. report) dated Jan. 11, 2016. <br />The main RUSLE calculations still use the same average LS factor of 2.05 for both pre mining and post <br />reclamation. What I found interesting is that the L and S values are the same for the Loadout Area and the <br />Portal and RDA Areas. It seems unlikely that the length and slopes would be identical for both areas. The same <br />average LS factor of 2.05 is used for both areas. <br />In the added sediment demonstrations it appears that the steepest slope used is 25%. This is far less than <br />the slopes actually measured by DRMS (Harry Raney) on the RDA. <br />do not have a Map 33 to evaluate the length and slope used in the LS calculations, and the locations of these <br />drainage flow lines are not delineated in the report. <br />note that the last part of the rev. report contains the thought that the sediment ponds (4 and 5) are still in place <br />to contain the sediment runoff. If these ponds are anticipated to compensate for excess sediment load, this is <br />not a long term solution unless both are periodically cleaned out. Since I can speak for only pond 5, it may not <br />be cleaned out indefinitely. <br />Doug Corley <br />https://mail.googl e.com/m ai I/u/0/?ui=2&i k=e29129fcb5&view=pt&search= i nbox&th=15266035b95c5OcO&si m l=15266035b95c5OcO 1 /1 <br />