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Draft Initial Study and Mitigated Negative Declaration

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Draft Initial Study and Mitigated Negative Declaration Initial Study and Mitigated Negative Declaration Recoat Mokelumne Aqueducts Phase 8 - Slough Crossings Project East Bay Municipal Utility District May 2010 Initial Study and Mitigated Negative Declaration Recoat Mokelumne Aqueducts Phase 8 - Slough Crossings Project East Bay Municipal Utility District May 2010 TABLE OF CONTENTS Recoat Mokelumne Aqueducts Phase 8 - Slough Crossings Project Initial Study/Mitigated Negative Declaration Acronyms and Abbreviations ..............................................................................................A-1 Executive Summary ............................................................................................................. E-1 1. Introduction Purpose/Legal Authority .............................................................................................1-1 Scope and Content .......................................................................................................1-2 Federal Review Process ..............................................................................................1-2 Public Review Process.................................................................................................1-2 2. Project Description Project Background .....................................................................................................2-1 Proposed Sequencing of Work.....................................................................................2-2 Description of Sites......................................................................................................2-3 Indian Slough Crossing....................................................................................2-4 Trapper Slough Crossing.................................................................................2-7 Holt Bend.......................................................................................................2-11 Black Slough Crossing...................................................................................2-14 Work Platform Systems .............................................................................................2-17 Dewatering Method...................................................................................................2-18 Containment System..................................................................................................2-21 Ventilation and Electrical Power Systems.................................................................2-21 Project Schedule, Construction Hours and Crew.......................................................2-22 Coordination with Other Agencies ............................................................................2-22 3. Environmental Checklist Form .......................................................................................3-1 Environmental Factors Potentially Affected................................................................3-2 Evaluation of Environmental Impacts .........................................................................3-3 Environmental Impact Checklist .................................................................................3-4 Aesthetics/Visual Quality................................................................................3-4 Agriculture and Forest Resources....................................................................3-5 Air Quality.......................................................................................................3-6 Biological Resources.....................................................................................3-15 Cultural Resources.........................................................................................3-36 Geology and Soils..........................................................................................3-37 Greenhouse Gas Emissions............................................................................3-39 Hazards and Hazardous Materials .................................................................3-41 Hydrology and Water Quality........................................................................3-44 Land Use and Planning ..................................................................................3-48 Mineral Resources.........................................................................................3-49 sb10_036.doc i 4/22/2010 Notice of Intent to Adopt A Mitigated Negative Declaration Recoat Mokelumne Aqueducts Phase 8 - Slough Crossings Project Noise ..............................................................................................................3-49 Population and Housing.................................................................................3-54 Public Services...............................................................................................3-55 Recreation ......................................................................................................3-55 Transportation/Traffic....................................................................................3-56 Utilities and Service Systems.........................................................................3-60 Mandatory Findings of Significance..............................................................3-61 Earlier Analysis..........................................................................................................3-63 References..................................................................................................................3-63 Appendix A: Mitigation Monitoring and Reporting Program Tables 2.1 Indian Slough...............................................................................................................2-7 2.2 Trapper Slough (2,000 feet in slough) .......................................................................2-10 2.3 Holt Bend (500 feet in Slough, 2,000 feet Overland)................................................2-14 2.4 Black Slough..............................................................................................................2-17 2.5 Potential Permits and Approvals for the Proposed Project and Alternatives.............2-23 Figures 2.1 Concrete Bent Support.................................................................................................2-1 2.2 Steel Bent Support .......................................................................................................2-2 2.3 Aerial View of Project Locations ................................................................................2-3 2.4 Indian Slough Crossing ...............................................................................................2-4 2.5 Arial View of Indian Slough Crossing.........................................................................2-5 2.6 Barge ..........................................................................................................................2-6 2.7 Trapper Slough Crossing .............................................................................................2-8 2.8 Aerial View of Trapper Slough Crossing ....................................................................2-8 2.9 Floating Platform .........................................................................................................2-9 2.10 Holt Bend...................................................................................................................2-11 2.11 Aerial View of Holt Bend..........................................................................................2-12 2.12 Holt Bend Culverts ....................................................................................................2-13 2.13 Black Slough Crossing...............................................................................................2-15 2.14 Aerial View of Black Slough Crossing......................................................................2-16 2.15 Typical Cribbing Support ..........................................................................................2-18 2.16 Clearance, Ground Surface Elevation, and Range of Water Elevations....................2-19 2.17 Example Projects Illustrating Installation of Water Barriers.....................................2-20 2.18 Example Containment Structure................................................................................2-21 sb10_036.doc ii 4/23/2010 ACRONYMS AND ABBREVIATIONS °C degrees Celsius °F degrees Fahrenheit µg/m3 micrograms per cubic meter AB Assembly Bill Aqueducts Mokelumne Aqueducts BAAQMD Bay Area Air Quality Management District BMP Best Management Practices BNSF Burlington Northern Santa Fe Railroad CAAQS California Ambient Air Quality Standards Cal/OSHA California Department of Industrial Relations, Division of Occupational Safety and Health CARB California Air Resources Board CCR California Code of Regulations CDFG California Department of Fish and Game CEQA California Environmental Quality Act CH4 methane CIWMB California Integrated Waste Management Board CNPS California Native Plant Society CNEL Community Noise Level Equivalent CO carbon monoxide CO2 eqv carbon dioxide equivalents CO2 carbon dioxide CPUC California Public Utilities Commission CSC California Species of Special Concern CTP Comprehensive Transportation Plan CUPAs Certified Unified Program Agencies CVP Central Valley Project CY cubic yards dB decibel dBA A-weighted decibel DDT dichlorodiphenyltrichloro ethane Delta Sacramento-San Joaquin River Delta DO dissolved oxygen DOT Department of Transportation
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