WSP03331

• File Number: 8210.430
• Description: Colorado River Basin Organizations-Entities - Gunnison - UVWUA - AB Lateral
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 7/1/2000
• Author: DOI
• Title: AB Lateral Hydropower Project - Supplemental Environmental Impact Report
• Water Supply Pro - Doc Type: Report/Study

j,to.,.'.' -....
001554

Contents

if;

2.1.2.4 Stilling Basin and Tailrace .....................................................2-7
2.1.2.5 Transmission Line .. ,.. ........................... .................................. 2-7
2.1.2.6 Safety Features .....................................................................2-11
2.1.2.7 Access to Facilities...............................................................2-11
2.1.2.8 Rights-of-Way ......................................................................2-11
2,1.2,9 Financing ............. ..................................... ............................ 2-12
2.1.2.10 Specific features of Alternatives ..........................................2-12
2.2 Alternatives Dismissed from Consideration.......................................................2-13

2.2.1 Smaller Projects...................................................................................... 2-13
2.2.2 South Canal Sites (PElS Alternative G).................................................2-14
2.2.3 Other Power Generating Sources ...........................................................2-14
2.3 Water Supply and Operation ..............................................................................2-15
2.3.1 Water Supply Allocation ........................................................................2-15
2.3.2 Specific Considerations... ................................. ........... ........... ................ 2-16
2.4 Environmental Commitments ............................................................................2-16
2.4,1 Gunnison River ......................................................................................2-16
2.4,2 Uncompahgre River ...............................................................................2-17
2.4.3 Uncompahgre River Bank Stabilization.................................................2-17
2.4.3.1 Design of Bank Stabilization Measures ...............................2-18
2.4.3,2 Site Selection.. ..............., ................. ................ ......... ............2-22
2.4.4 Restoration of Disturbed Lands.............................................................. 2-27
2.4.5 Wetland Mitigation, Uncompahgre River ..............................................2-27
2.4.5.1 Site Acreage, Identification, and Locations........................., 2-27
2.4.5.2 Site Design and Implementation ..........................................2-28
2.4.5.3 The Wetland Mitigation Site ................................................2-29

2.4.5.4 Access.............."....,......................."..................,..............,... 2-30
2.4.6 Monitoring and Maintenance .................................................................2-30
2.4.6.1 Bank Stabilization Monitoring.............................................2-31
2.4.6.2 Wetlands Mitigation Sites - Monitoring and Performance

Standards.,............................................................................ 2-32
2.4.6.3 Uncompahgre River Wetlands and Riparian Vegetation

Monitoring. ............................ ,........ .... ........ .......................... 2-32
2.4,6.4 Uncompahgre River Channel Monitoring............................2-33
2.4.6.5 Maintenance Fund .... ...................,..,............,........................ 2-33
2.4.7 Endangered Species and Other Affected Wildlife..................................2-34
2.4.8 Pollution Control and Aesthetics............................................................2-35

2.5 Legal Consi derati ons ................,...........................,.,........................................... 2-36
2.5.1 Permits and Regulatory Approvals.........................................................2-36
2.5.2 Water Quality Permits ............................................................................2-36

2.5.3 Water Rights ................................ ....................................,......................2-36
2.6 Comparison of Environmental Consequences ...................................................2-38

3.0 Affected Environment and Environmental Consequences
3.1 General Description of the Region .......................................................................3-1

AS Lateral Hydropower Project

~~
, ~;
,'j
.

July 2000

5
~