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III'lllllllll'll III ' Do~ / gZ/~~ Ot <br />~~, EXHIBIT 7 <br />~`• HYDROLOGY ARCHIVED INFORMATION <br />1) Colowyo Summary of Changes to Surface Runoff Control <br />Structures - Prospect and West Pit Ponds, Curve Number <br />Justification. <br />2) Design of Surface Runoff Control Structures Tipton and <br />Kalmbach, Inc., 1981. <br />3) Calculations for Rock Riprap Protection and Geometry for <br />Channels and Ditches - Tipton and Kalmbach, Inc., 1982. <br />4) Design of Surface Runoff Control Structures - Prospect, <br />Section 16. West Pit Ponds and Diversions. <br />5) East Taylor Pond Hydrology/Sedimentology/Diversion Ditch <br />Designs, 1995. <br />6) Post Mining Riprap Drainage Designs - Final East Pit, <br />Prospects, West Pit, Taylor Tributary, Gulch B or West Pit <br />Fill and Section 11 Ditches, 1995. <br />c <br />7) Pre and Post Mining Drainage Profiles - Map 33 & Map 33A <br /> <br />~ ~- i3- v <br />-~. Tip- 9/ <br />