Final Environmental Assessment Nimbus Dam Radial Gates Maintenance Project May 2015 U.S. Department of the Interior Bureau of Reclamation Central California Area Office May 2015 Mission Statements The mission of the Department of the Interior is to protect and provide access to our Nation’s natural and cultural heritage and honor our trust responsibilities to Indian Tribes and our commitments to island communities. The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public. Table of Contents Chapter 1 Introduction ................................................................................................................... 1 1.1 Background ........................................................................................................................ 1 1.2 Purpose and Need .............................................................................................................. 1 Chapter 2 Alternatives Including Proposed Action ........................................................................ 4 2.1 No Action Alternative ........................................................................................................ 4 2.2 Proposed Action Alternative .............................................................................................. 4 2.2.1 Waterway and Marine Construction .............................................................................. 4 2.2.2 Radial Gate Maintenance .............................................................................................. 6 2.2.3 Sediment Removal and Disposal ................................................................................. 11 2.2.4 Bulkhead Storage Facility ........................................................................................... 16 2.2.5 Handrail Repairs .......................................................................................................... 16 2.2.6 General Construction ................................................................................................... 18 Chapter 3 Affected Environment & Environmental Consequences ............................................. 28 3.1 Resources Not Analyzed in Detail ................................................................................... 28 3.2 Air Quality and Climate Change...................................................................................... 30 3.3 Visual Resources.............................................................................................................. 35 3.4 Recreation ........................................................................................................................ 38 3.5 Public Health and Safety .................................................................................................. 43 3.6 Biological Resources ....................................................................................................... 46 3.7 Cultural Resources ........................................................................................................... 59 3.8 Noise ................................................................................................................................ 61 3.9 Transportation and Circulation ........................................................................................ 62 3.10 Water Resources .............................................................................................................. 63 Chapter 4 Consultation and Coordination .................................................................................. 67 4.1 Public Review Period....................................................................................................... 67 4.2 Fish and Wildlife Coordination Act (16 U.S.C. § 661 et seq.) ........................................ 67 4.3 Endangered Species Act (16 U.S.C. § 1531 et seq.) ........................................................ 67 4.4 National Historic Preservation Act (16 U.S.C. § 470 et seq.) .......................................... 67 4.5 Indian Trust Assets .......................................................................................................... 68 4.6 Executive Order 13007 – Indian Sacred Sites ................................................................. 68 4.7 Migratory Bird Treaty Act (16 U.S.C. § 703 et seq.) ...................................................... 68 4.8 Executive Order 11988 – Floodplain Management and Executive Order 11990 – Protection of Wetlands ..................................................................................................... 68 4.9 Clean Air Act (42 U.S.C. § 7506 (C)) ............................................................................. 68 4.10 Clean Water Act (16 U.S.C. § 703 et seq.) ...................................................................... 69 Chapter 5 References…………………………………………………………………………..70 Final Environmental Assessment i May 2015 Appendices Appendix A – Specification Drawings Appendix B – Water Removal Plan Appendix C – Containment System Plan/Lead and Heavy Metals Work Plan Appendix D – Sediment Sample Results Appendix E – Sediment Dredging and Disposal Plan Appendix F – Bulkhead Storage Facility Traffic Control Plan Appendix G – Emissions Calculations Appendix H – Biological Assessment Appendix I – Fish and Wildlife Service Concurrence List of Figures Figure 1 Regional Location Figure 2 Site and Vicinity Figure 3 Aerial Photograph Figure 4 Nimbus Dam Survey Figure 5 Dredging Treatment Staging Area Figure 6 Bulkhead Storage Facility Figure 7 Haul Routes Figure 8 American River Parkway Impacts List of Tables Table 1 Ambient Air Quality Standards Table 2 SVAB Attainment Status and De Minimis Levels for Federal Conformity Determinations Table 3 Project Estimated Emissions Table 4 Species List of Federally Listed, Proposed, and Candidate Species Table 5 Central Valley Steelhead Life Stage Use Bu Month, Lower American River List of Acronyms and Abbreviations A AES Analytical Environmental Services B BA Biological Assessment Final Environmental Assessment ii May 2015 C CAA Clean Air Act of 1970 CalEEMod California Emissions Estimator Model CAPs Criteria Air Pollutants CCR California Code of Regulations CDFW California Department of Fish and Wildlife CDPR California Department of Parks and Recreation CERCLA Comprehensive Environmental Response, Compensation & Liability Act CEQ Council on Environmental Quality CEQA California Environmental Quality Act CFR Code of Federal Regulations cfs cubic feet per second CNDDB California Natural Diversity Database CNPS California Native Plant Society CO carbon monoxide CO2 carbon dioxide CTCP Comprehensive Traffic Control Plan CWA Clean Water Act CVP Central Valley Project D dBA decibels A-weighted dbh diameter at breast height dgl diameter at ground level DWR Department of Water Resources E EA Environmental Assessment EO Executive Order EPCRA Emergency Planning & Community Right-To-Know Act F FEMA Federal Emergency Management Agency FESA Federal Endangered Species Act FLSRA Folsom Lake State Recreation Area FONSI Finding of No Significant Impact G GHG greenhouse gas GP/RMP FLSRA/Folsom Powerhouse State Historic Park General Plan and Resource Management Plan H HAPs Hazardous Air Pollutants I IPCC Intergovernmental Panel on Climate Change IRF Intermediate Regional Flood ITAs Indian Trust Assets J K km Kilometers Final Environmental Assessment iii May 2015 L Leq level of equivalence M MBTA Migratory Bird Treaty Act MSFA Magnuson-Stevens Fishery Conservation & Management Act N NAAQS National Ambient Air Quality Standards NAHC Native American Heritage Commission NEPA National Environmental Policy Act NESHAPS National Emissions Standards for Hazardous Air Pollutants NFIP National Flood Insurance Program NHPA National Historic Preservation Act NMFS National Marine Fisheries Service NO2 nitrogen dioxide NOx Nitrogen oxides NPDES National Pollutant Discharge Elimination System NWP national wide permits O O3 ozone OHWM Ordinary high water mark OSFM Office of the State Fire Marshal P Pb Lead PCBs Polychlorinated Biphenyls PM Particulate Matter PM2.5 particulate matter 2.5 microns in diameter PM10 particulate matter 10 microns in diameter PSD Prevention of Significant Deterioration Q R RCRA Resource Conservation & Recovery Act Reclamation Bureau of Reclamation ROG Reactive Organic gases RWQCB Regional Water Quality Control Board S SHPO State Historic Preservation Office SIPs State Implementation Plans SO2 sulphur dioxide SSPC Society of Protective Coatings SVAB Sacramento Valley Air Basin T TCLP Toxicity Characteristics Leaching Procedure Method TCE trichloroethelyne TMDL total maximum daily load tpy tons per year TPQ Threshold Planning Quantity Final Environmental Assessment iv May 2015 U UAIC United Auburn Indians Community USACE U.S. Army Corps of Engineers USBR U.S. Bureau of Reclamation U.S.C. United States Code USEPA United States Environmental Protection Agency USFWS United States Fish and Wildlife Service USGS United States Geological Survey V VELB valley elderberry longhorn beetle W X Y Z Final Environmental Assessment v May 2015 Chapter 1 Introduction 1.1 Background In conformance with the National Environmental Policy Act of 1969 (NEPA), as amended, the Bureau of Reclamation (Reclamation) has prepared this Environmental Assessment (EA) to evaluate and disclose any potential environmental impacts