WSP06512

• File Number: 8220.200.02.I
• Description: Southern Nevada Water Project
• State: NV
• Basin: Colorado Mainstem
• Date: 1/1/1995
• Author: Dames & Moore
• Title: Environmental Assessment of the Colorado River Commission's Proposed Southern Nevada Water System Facilities Improvement Project
• Water Supply Pro - Doc Type: EIS

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TABLE OF CONTENTS

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Pue No.

EXECU1TVESUM~Y ................. ................. ........... ~

1.0 PURPOSE AND NEED FOR ACTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1
1.1 PROJECT OVERVIEW AND BACKGROUND . . . . . . . . . . . . . . . . . . .. 1-1
1.2 DESCRIPTION OF THE EXISTING WATER DELIVERY SYSTEM. . . . ., 1-1

1.3 PURPOSE AND NEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2.0 ALTERNATIVES INCLUDING THE PROPOSED ACTION .................. 2.1

2.1 PROPOSED ACTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.1 Saddle Islml Low Lift Pumping Station Improvements . . . . . . . . . ., 2-1
2.1.2 AMSWTF Improvements ............................. 2-6
2.1.2.1 DIsi1ifectlon Systorl ........................... 2-6
2.1.2.2 FUter Backwash Tank '" . . . . . . . . . . . . . . . . . . . . . .. 2-6
2.1.2.3 FUter to Waste System . . . . . . . . . . . . . . . . . . . . . . . . ., 2-8
2.1.2.4 FUtD Modificat/o1l8 ........................... 2-8
2.1.2.S Clearwell and Forebay Addition. . . . . . . . . . . . . . . . . . .. 2-8
2.1.2.6 Pumping PlDnt Ie ........................... 2-8

2.1.3 Waterline Turnouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-9
2.1.4 East Side Pipelines ................................. 2-9
2.1.S PumpingPlantandForebay2C ......................... 2-9
2.1.6 East Side Regulating Tank. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.1.7 ParallelRiverMoulltJoinllThnnel........................ 2.10
"2.1.8 West Side River Mountains Storage Tank .................. 2-11
2.1.9 Electric Power Improvements .......................... 2-11
2.1.10 West Side Pipeline Laterals and Pumping Plant. . . . . . . . . . . . . . . 2-12
2.1.11 Project Construction Schedule, Personnel, and Equipment. . . . . . ., 2-17
2.2 ALTERNATIVES CONSIDERED BUT ELIMINATED FROM DETAll..ED
CONSIDERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.2.1 Southern Nevada Water Authority Treatment and Transmission Facility

(TI'F) Acceleration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

2.2.2 Water Conservation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2S
2.3 ALTERNATIVES TO BE EVALUATED IN DETAIL ............... 2-26

2.3.1 No Action ...................................... 2-26

3.0 AIR QUALITY ............................................... 3-1
3.1 AFFECTED ENVIRONMENT .............................. 3-1
3.1.1 Climate and Meteorology ............................. 3-1

3.1.2 Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-1
3.1.3 Air Quality Regulations .............................. 3-3
3.1.4 Significance Criteria ................................ 3-3