WSP10595

• File Number: 8220.106
• Description: Animas-La Plata
• State: CO
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 1/1/2000
• Title: Draft Supplemental Environmental Impact Statement - Volume 1
• Water Supply Pro - Doc Type: EIS

TABLE OF CONTENTS (continued)

Chanter Pal!e No.

3.2.3.1.2 La Plata River ............................. 3-17
3.2.3.1.3 Mancos River ............................. 3-17
3.2.3.1.4 San Juan River.... .. .... . . ... .. .. .. . . .... ..3-18
3.2.3.1.5 Navajo Reservoir.... . .. .... ... .. .. . .. .. ....3-18
3.2.3.2 Refined Alternative 4 Non-Structural Component... .. . ..... . . 3-18
3.2.3.2.1 Pine River ................................3-18
3.2.3.2.2 Florida River.. . ... . . .. ..... .. .. .. . ....... . 3-18
3.2.3.3 Refined Alternative 6 .. .. .. .... .. .. . . . . .. . .. .. . .. . .... . . 3-19
3.2.3.3.1 Dolores River. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 3-19
3.2.3.3.2 McElmo Creek.. .. .. .... . . .. . .... . . . . ..... . 3-19
3.2.4 Environmental Consequences and Mitigation ......................,. 3-19
3.2.4.1 Refined Alternative 4 . . .... .. .... ...... . . .... . .. . ...... . 3-19
3.2.4.1.1 Operation of Structural Components and Delivery
to Non-Binding Uses .... . . . . . . . . . . . . . . . . . . . . 3-20
3.2.4.1.2 Water Conveyance Impacts for Non-Binding Uses. 3-28
3.2.4.2 Refined Alternative 6 ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
3.2.4.3 No Action Alternative .................................. 3-33
3.3 WATER QUALITY ................................................... 3-33
3.3.1 Introduction.... . .. ... ..... .. . .... .. .... .. ... . ... .... ... ..... ..3-33
3.3.2 Evaluation Methodology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33
3.3.2.1 Methodology .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33
3.3.2.1.1 Approach................................. 3-33
3.3.2.1.2 Standards by State . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36
3.3.2.1.3 Sites with Water Quality Measurements. . . . . . . . . 3-36
3.3.2.1.4 Historic Streamflow Data .................... 3-36
3.3.2.1.5 Streamflow Data from the San Juan River
Hydrology Model. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36
3.3.2.2 Significance Criteria. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38
3.3.3 Affected Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-38
3.3.3.1 Animas River ......................................... 3-38
3.3.3.2 San Juan River ........................................ 3-39
3.3.3.3 Pine River. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39
3.3.3.4 Mancos River ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
3.3.3.5 La Plata River. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
3.3.3.6 Florida River. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
3.3.4 Environmental Consequences and Mitigation ........................ 3-40
3.3.4.1 Refmed Alternative 4 ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
3.3.4.1.1 Structural Component with Delivery to
Non-Binding Uses. . . . . . . . . . . . . . . . . . . . . . . . . . 3-41
3.3.4.1.2 Non-Binding End Uses and Water Conveyance

Systems .................................. 3-52
3.3.4.2 Refined Alternative 6 .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55
3.3.4.2.1 Structural Component ....................... 3-55
3.3.4.2.2 Non-Structural Component. . . . . . . . . . . . . . . . . . . 3-55
3.3.4.2.3 Non-Binding End Uses ...................... 3-56
3.3.4.3 No Action Alternative ..............................,... 3-57
3.4 VEGETATION RESOURCES .......................................... 3-57
3.4.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-57
3.4.2 Evaluation Methodology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-57

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