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<br />Table of Contents
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<br />1.0 INTRODUCTION.... . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
<br />1.1 Project Background ,........,.................,...... 1
<br />1.2 Purpose of and Need for Action .......................... 2
<br />1.3 Purpose of the Environmental Assessment . . . . . . . . . . . . . . . . . ".". . 2
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<br />1.4 Summary . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . : . 2
<br />1.4.1 Summary of Proposed Action "............,...... 2
<br />1.4.2 Summary of Effects .........,......,....,...... 2
<br />1.4.3 Conclusions and Findings ..............,......... 2
<br />1.4.4 Environmental Commitments ........."........... 3
<br />1.5 Compliance with Environmental Requirements . . . . . . . . , . . . . . . . . 3
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<br />2.0 AUTHORIZATION AND PROJECT DESCRIPTION ............. 3
<br />2.1 Authorization .......,...,...........,..........,... 3
<br />2.2 Project Description . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . , . . . 3
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<br />3.0 ALTERNATIVES ............................."...... 4
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<br />3.1 No Action ...............,...,......."....,...... 4
<br />3.2 Adopt Water Control Manual ..., . , , , . . . . . . . , . . . . . . . . . . . , 4
<br />3.3 Comparison of Stage-Frequency Curves ..............,..... 6
<br />3.4 Future Conditions With and Without Project ............,..... 9
<br />3.4.1 Future Conditions With Project. . . . . . . . . . . , . . . . . . . . . 9
<br />3.4.2 Future Conditions Without Project ................,. 9
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<br />4.0 ENVIRONMENTAL SETTING .,...,.......,.,....,....., 9
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<br />4.1 Climate ..,............"................,....,... 9
<br />4.2 Topography ,..,................".......,..,...... 9
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<br />4.3 Geology .,............"...........,..........,. 10
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<br />4.4 Soils ..........................,..........,.,... 11
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<br />4.5 Land Use .....................,...........,.,... 11
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<br />4.6 Socioeconomics ................."."......,..,... 12
<br />4.7 Water Quality ... . . . . . . . . . . . . . . . . . , . . . . , "' . . . , . . . . .. 13
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<br />4.8 Air Quality ......................,............... 14
<br />4.9 Cultural Resources ............,........,........... 15
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<br />5.0 ENVIRONMENTAL EFFECTS ........,...........,...... 15
<br />5.1 Vegetation ..,.............................."...... 15
<br />5.1.1 Existing Environment. . , . , . . . . . . . . . . . . . , . . . . . .. 15
<br />5.1.2 Environmental Effects. . , . . , . . . . . . . . . . . . . . . . . . .. 17
<br />5.1.3 Mitigation ............:.................... 18
<br />5,2 Threatened, Endangered, and Candidate Species. . . , . . . . , . . . . . ..18
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