2008-02-19_GENERAL DOCUMENTS - C1981047

• Permit No: C1981047
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Date: 2/19/2008
• Doc Name: Proposed Decision & Findings of Compliance for RN5
• Permit Index Doc Type: Findings
• Media Type: D
• Archive: No

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TABLE OF CONTENTS
Introduction ......................................................................................................................................................... 1
Proposed Decision .............................................................................................................
Summarv .............................................................................................................................................................. 2
The Review Process ..........................................................................................................................2
Description of the Environment ........................................................................................................3
Site Description and Land Use -Rule 2.04.3 ......................................................................3
Cultural and Historic Resources -Rule 2.04.4 and 2.05.6(4) ..............................................3
H}~drologic Balance -Rule 2.04.5, 2.04.7, 2.05.3(4), 2.05.6(3) and 4.05 ...........................4
Geology -Rules 2.04.5 and 2.04.6 ......................................................................................5
Climatological Information -Rule 2.04.8 ....................................................................... 5
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Soils -Rules 2.04.9 ..............................................................................................................5
Vegetation -Rule 2.04.10 ....................................................................................................6
Fish and Wildlife -Rule 2.04.11 .........................................................................................6
Description of the Operations and Reclamation Plan -Rule 2.05.3 and 2.05.4 ................................7
Findings of the Colorado Division of Minerals and Geoloev ......................................................................... 10
Explanation of Findinas ................................................................................................................. 10
SECTION A ................................................................................................................................... 10
Findings Required by Rule 2.07.6(2) ................................................................................ 10
SECTION B ................................................................................................................................... 12
I. Roads -Rule 4.03 .............................................................................................................. 12
A. Haul Roads ........................................................................................................... 12
B. Access Roads ........................................................................................................ 14
C. Light-Use Roads ................................................................................................... 14
II. Supp ort Facilities -Rule 4.04 ............................................................................................ 14
III. I~drologic Balance -Rule 4.05 ........................................................................................ 14
A. Water Quality Standards and El~luent Limitations ............................................... 14
B. Diversions and Conveyance of Overland Flow .................................................... 14
C. Stream Channel Diversions .................................................................................. 14
D. Sedimentation Ponds ............................................................................................ 15
E. Acid-forming and Toxic-forming Spoil ................................................................ 15
F. Impoundments ...................................................................................................... 15
G. Surface and Groundwater Monitoring .................................................................. 15
H. Transfer of Wells .................................................................................................. 15
I. Discharge of Water into an Underground Mine ................................................... 16
J. Stream Buffer Zones ............................................................................................. 16
K. Probable Hydrologic Consequences ..................................................................... 16
1. Description of the Hydrologic Environment ............................................ 16
a. Regional Geology ....................................................................... 16
b. Ground Water ............................................................................. 20
c. Surface Water ............................................................................. 21
d. Ground Water Effects and Mitigation ........................................ 22
e. Surface Water Effects and Mitigation ........................................ 24
2. Summary and Findings ............................................................................ 26