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Exhibit 7 <br />Hydrology Information <br />Vol. 2B <br />1) Ground Water Quality Colowyo Coal Mine, Leonard Rice Consulting Water Engineers, <br />Inc., 1979 <br />2) Colorado Discharge Permit System (CDPS) Permit, Stormwater Management Plan <br />(SMP), and Spill Prevention Containment and Control Plan (SPCC) <br />3) Design of Surface Runoff Control Structures Tipton and Kalmbach, Inc., 1979 <br />4) Drainage Plan for Colowyo Coal Company Work Area, Tipton and Kalmbach, LLC., <br />1979 <br />5) Amended Application for Approval of Plan for Augmentation and for Changes of Water <br />Rights, 1980 <br />6) Hydrologic and Erosional Characteristics of Regraded Surface Coal Mined Land in <br />Colorado, Striffler and Rhodes, 1981 <br />7) Modification of both Surface Water Monitoring and Alluvial Groundwater Monitoring <br />Locations, 1991 <br />8) Geotechnical Assessment East Taylor Pond, CTL/Thompson, Inc. 1995 <br />9) Haulroad Culvert Redesign, 1997 <br />10) Stoker Crusher Ditch, 1997 <br />11) Small Depressions/Tanks, 1997 <br />12) Section 16 Taylor Ditch, 1997 <br />13) Superceded <br />Vol. 2C <br />14) Emergency Spillway, Temporary and Permanent Channel Designs, Existing Structures <br />Summary Text <br />Appendix Exh7-14A Emergency Spillway Outslope Channel Designs <br />Appendix Exh7-14B Side Channel Designs (Temporary) <br />Appendix Exh7-14C West Pit Ditch & Taylor Tributary Ditch Channel Designs <br />(Permanent) <br />Appendix Exh7-14D Section 16 Fill Ditch, Final East Pit Ditch, & Prospect Ditch <br />Channel Designs (Permanent) <br />• Appendix Exh7-14E Streeter Gulch Ditch, SW Tributary to Streeter, SE Tributary to <br />Streeter Ditch Channel Designs (Permanent) <br />Exh. 7-14TOC-1 Revision Date: 3/28/08 <br />Revision No.: TR-71 <br />