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=:' <br />a <br />k <br />Mr. Robert Zuber <br />April 23, 2014 <br />Page 3 <br />model documentation in the TR -63 submittal, the drainage areu is 38.11 acres. Please explain this <br />discrepancy. In general more detail is needed regarding anv changes (from the approved model) to the <br />hydrology inputs. <br />Response: RESOLVED <br />DBMS Item 11. The approved design of Pond 013 indicates a capacity of approximately 14 acre-feet (at the <br />bottom of emergency spillway). The submittal, however, indicates a capacity of 29 acre-feet. Please explain <br />this discrepancy. <br />a. The test discussing the capacity of the pond should explain that in the model the pond holds <br />3 ac -ft of sediment <br />Response: As requested, Attachment 2.05.3(3) -25 -4 has been revised to include text discussing the 3 <br />ac -ft. of sediment capacity for Pond 13. <br />DRMS Item 12. Please include an analysis of Pond 013 capacity that includes pumping from the NH2 Pit. <br />This could be done in SEDCAD. or it can be a separate analysis shut includes inputs from the SEDC'AD <br />model as well as information on the volume of water in the pond and estimated pumping rates. <br />a. No further response required as part of this revision Further analysis of Pond 013 capacity <br />is required, but not as part of TR -63. What maximum level of water in the pond allows a <br />remaining capacity for the design event (10 year, 24- hour)? What rate of continuous <br />pumping from the NH2 Pit into the pond will keep the pond at or below this level? <br />Response: No response required. <br />DRMS Item 13. Please explain the origin of the particle size distributions used in the SEDCAD model for <br />both the spoil water and forflows in and out of the pond <br />Response: RESOLVED <br />DRMS Item 14. In Detail B, a fabric wrap is shown. Please explain the selection of this fabric to prevent <br />clogging or excessive sediment loading into the rock. Also, the tear and puncture strength should he <br />evaluated <br />Response: The fabric wrap is selected to facilitate drainage of spoil water into the rock drain while also <br />protecting the rock drain from clogging with finer material. A fabric like Geotex 104F, that satisfies <br />AASHTO M288 standards will be used. The specifications of the Geotex 104F are attached for <br />informational purposes only. <br />DRMS Item 15. Segment C lahels on the rnup seem to be switched. For example, the upper portion of <br />.Segment C should be A'— C rather Hunt A ' — C'. <br />Response: The labels shown on both the plan view and profile view of Segment C are correct. The up <br />gradient end of this segment is to the southeast, and is labeled C. The downhill end (discharging into Pond <br />AN COUAL OPPORTUNITY i AFFIRMATIVE ACTION EMPLOYER <br />A M)uchmk,ne Energy'C,,op nitive <br />