PERMFILE121739

• Permit No: C1980005A
• IBM Index Class Name: Permit File
• Doc Date: 9/12/2006
• Section_Exhibit Name: Tab 7 Hydrology
• Media Type: D
• Archive: Yes

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SENECA II MINE
ROUTT COUNTY
HYDROLOGY
TAB 7
TABLE OE CONTENTS
Page
HYDROLOGY 7-1
I. Groundwater Information 7-i '
A. Regional 7-2
B. Site Specific Groundwater 7-12
1. Monitoring Network and Well Completlcn
Information 7-13
2. Aquifer Characteristics 7-13
a. Groundwater Quality 7-18
b. groundwater Availability 7-93
3. Recha•,~e Capacity 7-SOb
II. Surface Water Information 7-54
A. Yampa River Basin 7-54
B. Fish Creek Basin 7-56
C. Grassy Creek Basin 7-63
1. Seneca II Mine Effluent 7-64
a. Quantity 7-64
b. Quality 7-77
2. Little Grassy and Grassy Creeks 7-96
III. Probable Hydrologic Consequences 7-98
A. Surface Water 7-98
1. Quantity 7-98
2. Quality 7-99
a. Erosion and Subsequent Sediment
Yield 7-99
b. Total Dl ssolved Solids 7-109
c. Parameters in Effluent That Have
Exceeded Water Quality Criterion 7-112
B. Ground Water 7-119
1. Quantity 7-119
... Quality 7-125
IV. Protection of the Hydrologic Balance 7-132
A. Measures to Control Surface and Ground Water 7-132
B. Measures to Control Sediment and Other
Parameters that may Exceed Water Quality
Criterion 7-136
C. Plan to Restore the Recharge Capacity and
Protect Ground Ground Water Quality 7-138
D. Plan for [he Collection, Recording and
Reporting of Hydrologic Oata 7-140
V. Water Rights 7-1:3
VI. A1[ernatSVe Water Supply Information 7-150
A. The size of the Affected Area %-i50
B. The Significance of Surface and Ground Water 7-150
VII. Seneca II Permit Renewal (19861 Hydrology Information 7-173
A. Probable Hydrologic Consequences 7-173
1. Surface Water 7-174
a. Quantity 7-174
b. Quality 7-208
1. Erosion and Subsequent
Sediment YSe1d 7-208
I1. Total Dissolved Solids 7-208
iii. Parameters in Effluent
Exceeding Colorado Department of
Health Standards 7-227
c. Probable Surface Water Impacts Due
to Mining 7-242
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i Revised 02/05/97