Biological Technical Report
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Biological Technical Report Coachella Valley Water District East Side Dike Improvement Project City of Indio, Riverside County, California Prepared for: Coachella Valley Water District 75-515 Hovley Lane East Palm Desert, California 92211 Prepared by: ECORP Consulting, Inc. 215 North 5th Street Redlands, California 92374 OCTOBER 2018 ECORP Consulting, Inc. has assisted public and private land owners with environmental regulation compliance since 1987. We offer full service capability, from initial baseline environmental studies through environmental planning review, permitting negotiation, liaison to obtain legal agreements, mitigation design, construction supervision, and monitoring and compliance reporting. Citation: ECORP Consulting, Inc. 2018. Biological Technical Report for the Coachella Valley Water District East Side Dike Improvement Project. City of Indio, Riverside County, California. Prepared for the Coachella Valley Water District. Redlands, California. Biological Technical Report for the Coachella Valley Water District East Side Dike Improvement Project CONTENTS 1.0 INTRODUCTION ................................................................................................................................................................... 1 1.1 Project Location ................................................................................................................................................... 1 1.2 Project Description ............................................................................................................................................. 1 2.0 REGULATORY REQUIREMENTS ...................................................................................................................................... 3 2.1 Federal Regulations ............................................................................................................................................ 3 2.1.1 Federal Endangered Species Act .................................................................................................. 3 2.1.2 Migratory Bird Treaty Act ................................................................................................................ 3 2.1.3 Federal Clean Water Act .................................................................................................................. 4 2.2 State and Local Regulations ........................................................................................................................... 4 2.2.1 California Endangered Species Act .............................................................................................. 4 2.2.2 Fully Protected Species .................................................................................................................... 4 2.2.3 Native Plant Protection Act ............................................................................................................ 5 2.2.4 California Fish and Game Code .................................................................................................... 5 2.2.5 Coachella Valley Multiple Species Habitat Conservation Plan (CVMSHCP) ................ 5 2.2.6 CEQA Significance Criteria .............................................................................................................. 6 3.0 METHODS ............................................................................................................................................................................... 7 3.1 Literature Search.................................................................................................................................................. 7 3.2 Field Survey ........................................................................................................................................................... 8 4.0 RESULTS ................................................................................................................................................................................... 9 4.1 Field Survey ........................................................................................................................................................... 9 4.1.1 Site Characteristics and Land Use ................................................................................................ 9 4.1.2 Soils .......................................................................................................................................................... 9 4.1.3 Plants ....................................................................................................................................................... 9 4.1.4 Wildlife .................................................................................................................................................... 9 4.2 Vegetation Communities/Habitats ........................................................................................................... 10 4.2.1 Fourwing Saltbush Scrub (Atriplex canescens Shrubland Alliance) ............................. 10 4.2.2 Mesquite Thickets (Prosopis glandulosa Woodland Alliance) ....................................... 10 4.2.3 Disturbed ............................................................................................................................................ 12 4.3 Special-Status Species .................................................................................................................................... 12 4.3.1 Special-Status Plants ...................................................................................................................... 12 4.3.2 Special-Status Wildlife ................................................................................................................... 14 4.3.3 Raptors and Migratory Birds ....................................................................................................... 19 4.4 Jurisdictional Waters ....................................................................................................................................... 19 4.5 Wildlife Movement Corridors, Linkages, and Significant Ecological Areas ............................... 19 ECORP Consulting Inc. i 2017-187 East Side Dike Improvement Project Biological Technical Report for the Coachella Valley Water District East Side Dike Improvement Project 4.6 Local Policies and Ordinances ..................................................................................................................... 20 4.7 HCPs and NCCPs – CVMSHCP .................................................................................................................... 20 4.7.1 Conserved Habitats within the EIHCA ..................................................................................... 20 4.7.2 Conserved Natural Communities within the EIHCA .......................................................... 22 4.7.3 Biological Corridors and Linkages ............................................................................................ 28 4.7.4 Joint Project Review Process ....................................................................................................... 28 5.0 IMPACT ANALYSIS ............................................................................................................................................................ 33 5.1 Special-Status Species .................................................................................................................................... 33 5.2 Sensitive Natural Communities .................................................................................................................. 34 5.3 Federally Protected Wetlands and Waters of the US ........................................................................ 34 5.4 Wildlife Corridors and Nursery Sites ........................................................................................................ 34 5.5 Local Policies and Ordinances ..................................................................................................................... 35 5.6 HCPs and NCCPs – CVMSHCP .................................................................................................................... 35 6.0 MITIGATION MEASURES ................................................................................................................................................ 35 7.0 CERTIFICATION .................................................................................................................................................................. 38 8.0 LITERATURE CITED ........................................................................................................................................................... 39 LIST OF TABLES Table 1. Weather Conditions During the Survey ........................................................................................................... 9 Table 2. Vegetation Communities and Land Cover on Project Site .................................................................... 10 Table 3. CNPS Status Designations ................................................................................................................................. 12 Table 4. Conservation Objectives for the EIHCA ........................................................................................................ 29 LIST OF FIGURES Figure 1. Project Vicinity and Location .............................................................................................................................