2021-07-21_PERMIT FILE - C1981019A ‎(4)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 7/21/2021
• Doc Name: Table of Contents
• Section_Exhibit Name: Exhibit 07 Hydrology Information
• Media Type: D
• Archive: Yes

Exh. 7-14TOC-1 Revision Date: 5/4/21
Revision No.: TR-148
Exhibit 7
Hydrology Information

Volume 2B
1) Ground Water Quality Colowyo Coal Mine, Leonard Rice Consulting Water Engineers,
Inc., 1979

6) Hydrologic and Erosional Characteristics of Regraded Surface Coal Mined Land in
Colorado, Striffler and Rhodes, 1981

7) Modification of both Surface Water Monitoring and Alluvial Groundwater Monitoring
Locations, 1991

8) Geotechnical Assessment East Taylor Pond, CTL/Thompson, Inc. 1995

9) Haulroad Culvert Redesign, 1997

10) Stoker Crusher Ditch, 1997

12) Section 16 Taylor Ditch, 1997

14) Lower Administration Building Small Area Exemption

15) Haul Road A Upper and Lower Ditches

Volume 2C
14) Emergency Spillway, Temporary and Permanent Channel Designs, Existing Structures
Summary Text
Appendix Exh. 7-14A Emergency Spillway Outslope Channel Designs
Appendix Exh. 7-14B Side Channel Designs (Temporary)
Appendix Exh. 7-14E Streeter Gulch and Buckskin Draw Ditches (Permanent)
Appendix Exh. 7-14F Coal Road Ditch
Appendix Exh. 7-14P Small Area Exemption
Appendix Exh. 7-14R East Pit Reclamation Area, Prospect Ditch, North Trib East Pit
Ditch, Final East Pit Ditch

15) Stability Evaluation, Existing Sedimentation Pond Embankments, CTL/Thompson Inc.
1998

16) Adjudicated and permitted surface and groundwater locations within 1 mile of the Permit
boundary

18) Gulch A Small Area Exemption

19) Point of Compliance Well Investigation Report – Colowyo Mine, AECOM 2021