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W"im <br />'1. <br />COLORADO <br />1A <br />State.co.us Executive Branch Mail - Re: Diversion ditch design <br />Leigh - I have completed my review; my review memo is attached. <br />Alysha: <br />C1981012 <br />Enforcement <br />CV2013008 <br />Review of As -Built Survey of RDA Ditch <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 />On Mon, Nov 4, 2013 at 1:02 PM, Simmons - DNR, Leigh <1eigh.simrnons@state.co.us> wrote: <br />Susan, <br />My original message provides the introduction. <br />have saved the survey results at M: \Coal \LDS \New Elk \RDA, together with exhibit 30 (which shows the RDA <br />design) and section 2.05 of the permit. <br />Once I received the survey results I expected to quickly find the approved design in the permit and compare the <br />two... hmmmm, not so far. <br />Ponds, impoundments and diversions are discussed from page 2.05 -9 of the permit (p21 of the pdf file). <br />There is no specific mention of the upland diversion above the RDA. Also, the ditch is not included in table 20 <br />(ditch data). There is a statement on page 2.05 -9: <br />"These sedimentation ponds and associated diversion ditches have been designed according to <br />Section 4.05.6 of the DRMS Regulations. In addition, the diversion structures have been designed <br />utilizing the requirements of 4.05.3 and 4.05.4" <br />Those sections of the regulations do not seem particularly specific or helpful. <br />So my first group of questions is about the design of upland diversions - are they generic? should they be <br />based on some modeling results? should we have any sort of as -built certification? is this permit deficient, or <br />am I missing something? <br />I'll be out tomorrow, and it looks as though you plan to be out this week too. Perhaps we could talk about it <br />when you return. <br />Leigh <br />https: / /mai l.g oog le.conVmai 1 /u /0 / ?ui =2 &i Ire29129fcb5 &\iev�-- pt &search =i nbox&th= 14272829c89cl24b 1/3 <br />