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W"im <br />State.co.us Executive Branch Mail - Re: Diversion ditch design <br />Leigh Simmons <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, /dining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />303 866 3567 (8121) <br />On Mon, Nov4, 2013 at 9:55 AM, Brown - DNR, Sandy <sandy.brown state.co.us> wrote: <br />Hi Leigh, <br />I'd like Susan to help you out with this. Will you please provide her the information you want her to review? <br />Thanks, <br />Sandy <br />On Thu, Oct 31, 2013 at 11:40 AM, Simmons - DNR, Leigh <1eigh.s1mmons@state.co.us> wrote: <br />Sandy, <br />At the New Elk mine the Refuse Disposal Area fills a steep drainage. Immediately below the RDA is a <br />sediment pond and below that is Highway 12, then the Purgatoire River. <br />Above the RDA is a diversion ditch. <br />Since I have been visiting the mine I have been convinced that the diversion ditch does not have a positive <br />drainage gradient at all points, and have raised this concern numerous times. During an inspection in the <br />summer of 2013 (July, I think), I noticed that the ditch had breached following a storm that was smaller <br />than a 10 year /24 hour event. <br />As part of the abatement for NOV 008 we required that NECC: <br />clear the ditch of fallen rocks and trees; <br />survey the entire length of the ditch to allow comparison of the constructed ditch with the approved <br />design. <br />NECC has completed both abatement actions and sent me the results of their survey. I have not yet <br />studied the results or compared them with the permit. It would be helpful for me to work with another <br />specialist from our team who has more experience with ditch design to use the survey results and <br />determine: <br />if the ditch is constructed in accordance with the approved design; <br />if the design is adequate; <br />if and how we will require NECC to alter the ditch. <br />Thanks, <br />Leigh <br />Leigh Simmons <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Alining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />303 866 3567 (8121) <br />Sandra L. Brown <br />https: / /mai l.g oog le.conVmai 1 /u /0 / ?ui =2 &i Ire29129fcb5 &�iev�-- pt &search =i nbox&th= 14272829c89cl24b 2/3 <br />