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Scott Wanstedt <br />Page 2 <br />Oct. 8, 2015 <br />4. The included SEDCAD model for MR -166 does not include a section of text to explain how the <br />model is set up. Please include a section of text at the beginning of the model that <br />explains how the model is set up and the sources of flows into each structure. The <br />section should address if surface runoff is simulated or only discharge from the <br />dewatering system. <br />5. Please explain why the inflow to structure #5 is magnitudes lower than the inflow to the <br />last pond (structure #1) in the SDH -3 system. Similarly the inflow to Structure #1 (4.25 <br />cfs) is magnitudes higher than the outflow from Structure #1 (0.96 ds), please clarify <br />why there is a large difference between the inflow and outflow for the structure. <br />Map 140 - SDH -3 Structure #1 <br />6. Map 140 submitted in MR -166 has Elevations for the embankment, emergency spillway and <br />Primary discharge pipe for SDH -3 that are not consistent with the elevations on Map 140 in <br />the approved PAP. Please clarify why the elevations are not the same as the ones on the <br />approved Map 140 in the Deserado Permit. <br />This concludes the Division's adequacy review of Minor Revision 166 for the Deserado Mine. Please <br />contact me at (303)-866-3567 x8144 if you have any questions or comments regarding this adequacy <br />review. <br />Sincerely, <br />Clayton Wein <br />Environmental Protection Specialist <br />C Layton. wei n@state. co. us <br />