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III III III I II IIII III Doc Date:12/11/2001 <br />sss <br />t._, .,,, <br />Vol 2c <br />Vol 2D <br />t ~ EXHIBIT 7 ~` <br />~.~ ~- 'J <br />"~ ~~ HYDROLOGY INFORMATION `~ <br />_i <br />__. _ __ <br />1) Ground -er--Quality Colowyo Coal Mine, Leonard Rice <br />Consulting Water Engineers, Inc., 1979 <br />2) Colorado Discharge Permit System (CDPS) Permit, <br />Stormwater Management Plan (SMP), and Spill Prevention <br />Containment and Control Plan (SPCC). <br />3) Design of Surface Runoff Control Structures Tipton and <br />Kalmbach, Inc., 1981 <br />4) Drainage Plan for Colowyo Coal Company Work Area, Tipton <br />and Kalmbach, Inc., 1979. <br />5) Amended Application for Approval of Plan for <br />Augmentation and for Changes of Water Rights, 1980. <br />6) Hydrologic and Erosional Characteristics of Regraded <br />Surface Coal Mined Land in Colorado, Striffler and <br />Rhodes, 1981. <br />7) Modification of both Surface Water Monitoring and <br />Alluvial Groundwater Monitoring Locations, 1991. <br />8) Geotechnical Assessment East Taylor Pond, CTL/Thompson, <br />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) SEDCAD Modeling and Maps, 10 Existing Sediment Ponds, <br />1998 <br />14) Emergency Spillway, Temporary and Permanent Channel <br />Designs, Existing Structures, 1998. <br />15) Stability Evaluation, Existing Sedimentation Pond <br />Embankments, CTL/Thompson, Inc. 1998. <br />16) Adjudicated and permitted surface and groundwater <br />locations within 1 mile of the Permit boundary. <br />Revision Submitted 3 - ~" ~ - `' f <br />Revision No. -f" ~ - s-v <br />