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Final Environmental Assessment

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Final Environmental Assessment I_ Managing Water in the West \ < ! . ; ' - !,, j ,.,,:";_,i,'.; ; Final Environmental Assessment Contra Costa Canal Replacement Project, Contra Costa County, California { 0Es~N AR.GI Powf:R Al>M1 /IJISTl<ftTIOltJ.) OoofE:RA-n nl G: /JrG-E1VC. y boE/EYJ-/£~9) tit?/i,.f\1\mH OF THE /Nie :::._ U.S. Department of the Interior ~ft O · = ~ ' Bureau of Reclamation -...._~/ Mid-Pacific Region June 2007 Section 1 Purpose and Need ........................................................................................................... 1 Introduction ................................................................................................................................. 1 Purpose and Need ....................................................................................................................... 1 Authority ..................................................................................................................................... 1 Section 2 Alternatives ..................................................................................................................... 3 Proposed Action .......................................................................................................................... 3 Overview ................................................................................................................................. 3 Detailed Description ............................................................................................................... 7 Environmental Protection Requirements .............................................................................. 15 Project Operations and Maintenance .................................................................................... 23 No Action Alternative ............................................................................................................... 23 Alternatives Considered but Eliminated from Detailed Analysis ............................................. 27 Offsite Alternative ................................................................................................................ 27 Canal Lining Alternative ....................................................................................................... 28 Pipeline Alignment within ROW, Retain Canal Alternative ................................................ 30 Section 3 Affected Environment. .................................................................................................. 32 Aesthetics .................................................................................................................................. 32 Air Quality ................................................................................................................................ 32 Biological Resources including Threatened and Endangered Species ..................................... 32 Cultural Resources .................................................................................................................... 51 Environmental Justice ................................................................. .' ............................................. 52 Geology and Soils ..................................................................................................................... 53 Hydrology and Water Quality ................................................................................................... 53 Surface Water. ....................................................................................................................... 53 Groundwater ......................................................................................................................... 55 Indian Trust Assets ................................................................................................................... 55 Land Use ................................................................................................................................... 56 Noise ......................................................................................................................................... 57 Recreation ................................................................................................................................. 58 Wetlands ................................................................................................................................... 59 Section 4 Environmental Consequences ....................................................................................... 62 Aesthetics .................................................................................................................................. 62 Proposed Action Alternative ................................................................................................. 62 No Action Alternative ........................................................................................................... 63 Air Quality ................................................................................................................................ 63 Proposed Action Alternative ................................................................................................. 63 No Action Alternative ........................................................................................................... 63 Biological Resources including Threatened and Endangered Species ..................................... 64 Proposed Action Alternative ................................................................................................. 64 No Action Alternative ........................................................................................................... 71 Cultural Resources .................................................................................................................... 72 Proposed Action Alternative ................................................................................................. 72 Western will be required to conduct its own consultation with SHPO pursuant to Section 106 of the NHPA for Western's pmtion of the project. ........................................................ 72 No Action Alternative ........................................................................................................... 72 Environmental Justice ............................................................................................................... 72 Contra Costa Canal Replacement Project Final Environmental Assessment Proposed Action Alternative ................................................................................................. 72 No Action Alternative ........................................................................................................... 72 Geology and Soils ..................................................................................................................... 73 Proposed Action Alternative ................................................................................................. 73 No Action Alternative ........................................................................................................... 73 Hydrology and Water Quality ................................................................................................... 73 Proposed Action Alternative ................................................................................................. 73 No Action Alternative ........................................................................................................... 75 Indian Trust Assets ................................................................................................................... 7 5 Proposed Action Alternative ................................................................................................. 75 No Action Alternative ........................................................................................................... 75 Land Use ................................................................................................................................... 75 Proposed Action Alternative ................................................................................................. 75 No Action Alternative ........................................................................................................... 76 Noise ......................................................................................................................................... 76 Proposed Action Alternative ................................................................................................. 76 No Action Alternative ........................................................................................................... 78 Recreation ................................................................................................................................. 79 Proposed Action Alternative ................................................................................................. 79 No Action Alternative ........................................................................................................... 79 Wetlands ................................................................................................................................... 79 Proposed Action Alternative ................................................................................................. 79 No Action Alternative 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