WSP03260

• File Number: 8276.120.10
• Description: Grand Valley Unit-Colorado River Basin Salinity Control Project
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 9/10/1991
• Title: Final Environmental Assessment: Alternative Lining Methods for the Government Highline Canal - Grand Valley Unit
• Water Supply Pro - Doc Type: EIS

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TABLE OF CONTENTS

CHAPTER I - INTRODUCTION. . 1
Purpose of Assessment 1
Location 1
Map 1 - Reach 1 of the Government Highline Canal 2
Map 2 - Reach 2 of the Government High1ine Canal 3
Grand valley Unit Final Environmental Impact Statement 4
Purpose and Need . . . . . . . . . . 7
Relationship with Other projects. . 8

Chapter II - DESCRIPTION OF ALTERNATIVES. 9
No-Action Alternative 9
Membrane Lining Alternatives. . . . 9
Modified Alternative Ml . . . . 9
Figure 1 - Typical Membrane-Lined Section (MlMOD,
M3MOD) . . . . . . . . . . . 11
Modified Alternative M3 . . . . . . . . . 12
Alternative M4 . . . . . . . . . . . . . 12
Figure 2 - Typical Membrane-Lined Section (M4,
C2MOD) . . . . . . . . . . . 13
Concrete Lining Alternatives . . . . . . . . . 14
Alternative C1 . . . . . . . . . . . . . 14
Figure 3 - Typical Concrete-Lined Section (Cl,
C2MOD) . . . . . . 15
Modified Alternative C2 16
Other Alternatives . 16
Alternative M2 16
Alternative PI 16
Alternative Gl 17
Alternative SC 17
Associated Actions. 17
Access Permits 17
Bridges. . . . 18
Fencing. . . . 18
Safety Features 19
Fish and Wildlife Measures 19
Summary Comparison of Alternatives 19
Land Acquisition . . . . . . 19
Table 1 - Comparison of Alternatives 20
Construction and O&M Costs 21
Recommended Alternative . . . . . . . . . 22

CHAPTER III - AFFECTED ENVIRONMENT AND ENVIRONMENTAL
CONSEQUENCES . . . . . 23
General Description of the Area 23
General Impacts 24
Land Use . 24
Table 2 - Reach 1 Land Use Impacts (Fee Land) 26
Table 3 - Reach 1 Land Use Impacts (Temporary ROW) 27

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