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Colowyo, 01981 -019, PR3 adequacy No. 3 13 July 22, 2011 <br />be taken to avoid concentration of mnoff flows from the areas with Small Area Exemptions, as <br />concentration of flow will cause a grass filter to malfunction. <br />Rule 4.05.3 Diversions and Conveyances of Less than One Square Mile <br />1. The drainage areas for Tributary 3 and Upper Badger Draw (upper end above Deer Draw, <br />Section 30+00) appear to be incomplete on Map 41 B. Please review and produce a revised <br />Map 41 B with complete drainage areas. <br />The response is inadequate. The drainage area for Tributary 3 still appears to be incomplete on <br />Map 41 B. Please revise Map 41B or provide turthcr discussion on this basin and its relation to <br />haul road drainage. <br />CCC's response is adequate. <br />Rule 4.05.4 Stream Channel Diversions /Relocations <br />1. More information is required for channel LCW, which is proposed as a vegetated channel in the <br />SEDCAD run. How will vegetation be established? What other means will be used to prevent <br />erosion per Rule 4.05.4(2)(a)? Also, see Rule 4.05.7 below. <br />The response renmins inadequate. <br />This item has been resolved with the August 9, 2011 submittal. <br />Rule 4.05.6 Sedimentation Ponds <br />6. The Structure Networking table indicates which areas drain to which channels for a few of the <br />channels (for example Structure 6 is fed by Area A -35), but not for most channels. Please <br />provide this information for all channels. <br />The response is inadequate. The information in the submittal shows connections bchecen <br />channels but provides eery little information on which sub - watersheds drain to which channels, <br />which is rahat was requested. <br />The response is inadequate. While Table 1 is very useful, it contains some minor errors that <br />should be corrected. For Structure 3, the area is mislabeled as A38a rather than A38; for <br />Structure 30, Area A27a has an incorrect CN value; for Structure 21, the area is mislabeled as <br />AS 17 rather than A17; and for Structure 11, the Name is mislabeled as RD2 rather than RDL <br />Also, the table facilitated a more detailed review of the SEDCAD model, and a possible error <br />was detected; it appears that the areas and curve numbers for Structure 10 (the Collom Sump) <br />may not be correct Area A6 appears to be much larger on the map (Figure Al in Exhibit 7, <br />