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TO: ZACII TRUJILLO <br />FROM: ROB ZUBER rp z <br />SUBJECT: NEW ELK TR 65, THIRD ADEQUACY REVIEW FOR HYDROLOGY <br />DATE: 8/1/2012 <br />Zach — <br />INTEROFFICE MEMORANDUM <br />This memo addresses several of NECC's responses (received by Division on 7/30/12) to our second adequacy <br />review. I am addressing comments 5 — 8 because these are the comments pertaining to my review, and because <br />NECC responses to these items in our preliminary adequacy review (PAR) were not adequate. <br />5. NECC must provide a plan for controlling runoff, particularly energy dissipation, once it flows through ditch D49 <br />and onto the Parks and Wildlife property. Also, a field inspection from early May 2012 reveals that the drainage <br />culvert on CPW's property which would relieve the runoff from ditch D49 has been buried. Finally, the Division <br />requests that NECC contact Colorado Parks and Wildlife (CPW) regarding the discharge point of ditch D49. <br />NECC: A temporary use agreement has been submitted to CPW to address energy dissipation of D49 once it leaves <br />NECC property. The plan includes extending D49 by approximately 60', plating it with 15" riprap and then <br />discharging into a 36" culvert, C85. The proposed arrangement can be seen on Map 14 and ditch and culvert <br />design shown on Tables 20 and 21, respectively. CPW approval will be submitted to DRMS once it is obtained. <br />Division: Per Table 20, the peak discharge in Ditch 49 (12 %) is 72.33 cfs. If this flows into culvert C85, why is the <br />flow for C85 in Table 21 only 33.51 cfs? <br />NECC needs to submit a copy of the signed (not the draft) temporary use agreement, for insertion into the Right of <br />Entry (Rule 2.03.6) section of the New Elk PAP. Preferably, this will be done before the Division decision on this <br />technical revision. <br />NECC: The design for C85 is based on the 10 -year event because the culvert is off the fill, and therefore not required <br />to be designed for the 100 -year event. In addition, please see attached Temporary Use agreement between NECC <br />and CPW, Exhibit 34- (1). The temporary Use Agreement is also discussed on revised page 2.03 -6d. <br />Division: Response is sufficient. <br />