Biological Resources

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Biological Resources NAPA COUNTY BASELINE DATA REPORT . CHAPTER 4 BIOLOGICAL RESOURCES PURPOSE UPDATE CHRONOLOGY The purpose of this chapter is to provide a NOVEMBER 30, 2005—VERSION 1 comprehensive summary of biological resources in Napa County and a mapped inventory of these features. The data assembled will provide a scientific basis for future regional and site-specific assessments of project impacts and for the evaluation of mitigation measures, conservation proposals, and enhancement opportunities for biological resources. It will also serve as a basis to evaluate current and future policies at the local and Countywide level as they relate to biological resource protection and enhancement. CALIFORNIA NEWT NAPA COUNTY BASELINE DATA REPORT BIOLOGICAL RESOURCES Western Mountains Evaluation Area.....................................................................................4-55 TABLE OF CONTENTS Eastern Mountains Evaluation Area......................................................................................4-56 Angwin Evaluation Area ........................................................................................................4-58 Livermore Ranch Evaluation Area.........................................................................................4-58 INTRODUCTION ................................................................................................................................4-1 Southern Interior Valleys Evaluation Area.............................................................................4-59 Purpose ..................................................................................................................................4-1 Central Interior Valleys Evaluation Area................................................................................4-60 Specialized Terms Used.........................................................................................................4-1 Pope Valley Evaluation Area.................................................................................................4-60 Berryessa Evaluation Area....................................................................................................4-61 POLICY CONSIDERATIONS................................................................................................................4-3 Knoxville Evaluation Area......................................................................................................4-62 Federal Policies ......................................................................................................................4-3 State Policies..........................................................................................................................4-5 FISHERIES RESOURCES..................................................................................................................4-64 Local Policies..........................................................................................................................4-6 Introduction ...........................................................................................................................4-64 Methodology..........................................................................................................................4-64 METHODOLOGY...............................................................................................................................4-8 Watershed Characterization..................................................................................................4-64 Evaluation Areas.....................................................................................................................4-8 Characterization of Steelhead Utilization in Napa County.....................................................4-72 Maps/Database Development.................................................................................................4-9 Sensitive Biotic Community Identification .............................................................................4-11 NEW BIOLOGICAL DATABASE.........................................................................................................4-76 Land Cover Conversion Calculations....................................................................................4-12 Identification of Wildlife Movement Areas.............................................................................4-12 CONCLUSIONS AND REPORT UPDATE RECOMMENDATIONS .............................................................4-76 Evaluation Areas...................................................................................................................4-14 Conclusions and Report Update Recommendations from Fisheries Resources...................4-77 CONTEXT ......................................................................................................................................4-14 RECOMMENDATIONS ......................................................................................................................4-78 Regional/Statewide Biological Context .................................................................................4-14 Biological Database Expansion.............................................................................................4-78 Countywide Biological Context .............................................................................................4-14 Biological Database Maintenance.........................................................................................4-78 BIOTIC COMMUNITIES ....................................................................................................................4-15 REFERENCES.................................................................................................................................4-79 Community Descriptions.......................................................................................................4-15 References Cited ..................................................................................................................4-79 Sensitive Biotic Communities................................................................................................4-41 Other Documents Used.........................................................................................................4-86 SPECIAL-STATUS SPECIES ............................................................................................................4-43 Definition of Special-Status Species.....................................................................................4-43 APPENDIX A ........................................................................................................................... BIO-A-1 Special-Status Plants............................................................................................................4-44 Special-Status Wildlife..........................................................................................................4-45 APPENDIX B ........................................................................................................................... BIO-B-1 WILDLIFE MOVEMENT AREAS.........................................................................................................4-46 APPENDIX C ........................................................................................................................... BIO-C-1 Importance of Wildlife Movement Areas ...............................................................................4-46 Types of Movement Areas....................................................................................................4-47 APPENDIX D ........................................................................................................................... BIO-D-1 Reasons for Movement.........................................................................................................4-47 PPENDIX Movement Requirements......................................................................................................4-48 A E.............................................................................................................................BIO-E-1 Potential Wildlife Movement Areas .......................................................................................4-48 EVALUATION AREA RESOURCES....................................................................................................4-51 Napa River Marshes Evaluation Area...................................................................................4-51 Jamieson and American Canyons Evaluation Area..............................................................4-52 Carneros Evaluation Area.....................................................................................................4-53 Napa Valley Floor Evaluation Area.......................................................................................4-54 BIOLOGICAL RESOURCES—VERSION 1, NOVEMBER 2005 -4-i- NAPA COUNTY BASELINE DATA REPORT FIGURES MAPS Follows page Follows page 4-1 Use of the Napa County Biological Database .......................................................................4-88 4-1 Evaluation Areas...................................................................................................................4-88 4-2 Napa County Conservation Areas.........................................................................................4-88 4-2 Wildlife Movement—CalWild Linkages..................................................................................4-88
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