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Yolo Bypass Salmonid Habitat Restoration & Fish Passage

Environmental Impact Statement Environmental Impact Report April 5, 2017

State of California Department of Water Resources

Range of Alternatives

Feature Alternative 1 Alternative 2 Alternative 3 Alternative 4 Alternative 5 Alternative 6 Notch Location Eastern Fremont Central Fremont Western Fremont Western Fremont Central Fremont (Multiple) Western Fremont Maximum Notch Flow 6,000 cfs 6,000 cfs 6,000 cfs 3,000 cfs 3,400 cfs 12,000 cfs Notch Invert Elevation 14 14.8 16.1 16.1 Multiple 16.1 Channel Bottom Widths 30’ bottom, 30’ bench 50’ bottom, 30’ bench 50’ bottom, 30’ bench 50’ bottom, 30’ bench West: 40’ 30’ bench; Center: 90’; East: 90’ 200’ bottom

• N. Bypass

Water Control Structure? No No No Yes Swanston 2° channels (program level) No Tertiary Fish Passage West West East East West East

DRAFT ­ Subject to Change 1

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Air Quality Calculations

• Construction emissions calculated based on

schedules, equipment, and construction worker estimates

• Estimated constituents of concern

Reactive organic gas (ROG) Nitrogen oxides (NOx) Carbon monoxide (CO) Sulfur dioxide (SO2) Inhalable particulate matter (PM10) Fine particulate matter (PM2.5)

• Compare to thresholds

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Air Quality Thresholds

• CEQA standards

Yolo-Solano AQMD significance thresholds Feather River AQMD significance thresholds

• Clean Air Act General Conformity evaluation

Lead agency required to demonstrate that proposed action conforms to State Implementation Plan If emissions are below “de minimis thresholds,” a full general conformity determination is not required If a general conformity determination is required, must revise the State Implementation Plan to accommodate emissions or purchase emissions credits

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DRAFT ­ Subject to Change 2

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Unmitigated Emissions (Daily)

Alter native Description PM10 (lbs/day) 1 East Side Small Gated Notch 1,843 2 Central Small Gated Notch 3,361 3 West Side Small Gated Notch 3,365 4 Managed Flow 4,376 5 Multiple Gates 8,543 6 Large Gated Notch 4,024 Yolo­Solano AQMD CEQA Significance Thresholds 80 Feather River AQMD CEQA Significance Thresholds 80 6

Unmitigated Emissions (Annual)

Alt ROG (tons/yr) NOx (tons/yr) PM10 (tons/yr) 1 1.2 16.1 23.7 2 1.7 24.3 48.2 3 2.2 31.0 72.7 4 3.7 57.9 93.2 5 6.0 71.1 333.2 6 3.9 61.1 149.6 Yolo­Solano AQMD 10 10 n/a Feather River AQMD 2.5 2.5 n/a Feather River AQMD (Alt 5) 3.6 3.6 n/a General Conformity 25 25 100

DRAFT ­ Subject to Change 3

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Air Quality Mitigation

• Reduce emissions by using Tier 4 construction

equipment instead of the fleet average for Merced County

• Pave roads used to remove spoil materials

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Mitigated Emissions (Daily)

Alter native Description PM10 (lbs/day) Mitigated PM10 (lbs/day) 1 East Side Small Gated Notch 1,843 170 2 Central Small Gated Notch 3,361 315 3 West Side Small Gated Notch 3,365 318 4 Managed Flow 4,376 450 5 Multiple Gates 8,543 823 6 Large Gated Notch 4,024 382 Yolo­Solano AQMD CEQA Significance Thresholds 80 80 Feather River AQMD CEQA Significance Thresholds 80 80

DRAFT ­ Subject to Change 4

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Mitigated Emissions (Annual)

Alt ROG (tons/yr) NOx (tons/yr) PM10 (tons/yr) Mitigated ROG Mitigated NOx Mitigated PM10 1 1.2 16.1 23.7 0.8 10.3 2.6 2 1.7 24.3 48.2 1.1 15.2 5.2 3 2.2 31.0 72.7 1.4 18.8 7.7 4 3.7 57.9 93.2 2.5 38.8 10.9 5 6.0 71.1 333.2 3.3 28.0 33.3 6 3.9 61.1 149.6 2.3 37.7 15.6 Yolo­ Solano 10 10 n/a 10 10 n/a Feather 2.5 2.5 n/a 2.5 2.5 n/a Feather (Alt 5) 3.6 3.6 n/a 3.6 3.6 n/a Conformity 25 25 100 25 25 100 10

Air Quality Options

• Extend schedules for Alternative 4, 5, and 6
• Trade-offs because longer schedules extend

biological impacts and delay fisheries benefits DRAFT ­ Subject to Change 5