FINAL BROAD BEACH RESTORATION PROJECT MARINE HABITAT MONITORING AND MITIGATION PLAN Prepared for: Broad Beach Geologic Hazard Abatement District 2049 Century Park East, Suite 2700 Los Angeles, CA 90067 Tel: (310) 746-4412 Contact: Mr. Kenneth Ehrlich Prepared by: Rincon Consultants, Inc. 180 North Ashwood Avenue Ventura, CA 93003 Tel: (805) 644-4455 And Merkel & Associates, Inc. 5434 Ruffin Road San Diego, CA 92123 Tel: (858) 560-5465 November 2017 Final Broad Beach Marine Habitat Monitoring and Mitigation Plan TABLE OF CONTENTS INTRODUCTION ................................................................................................................................ 1-1 Background ........................................................................................................................................ 1-1 Regulatory Agency Monitoring Need .......................................................................................... 1-1 Approaches to Meeting Monitoring Objectives ........................................................................... 1-2 Science Advisory Panel ...................................................................................................................... 1-3 Communications Plan ....................................................................................................................... 1-3 Centralized Data Management System ........................................................................................ 1-4 Email Correspondence ................................................................................................................. 1-4 Monitoring Reports ...................................................................................................................... 1-5 Semi-Annual Coordination Meetings .......................................................................................... 1-5 Monitoring Program Authorization Requirements ........................................................................ 1-6 EXISTING CONDITIONS .................................................................................................................. 2-1 Broad Beach Project Area of Potential Effect ................................................................................. 2-3 Marine Habitats Within the Broad Beach Area of Potential Effect ............................................. 2-7 Regional and Historic Sampling Programs ................................................................................... 2-18 Regional and Historic Data ........................................................................................................ 2-26 REFERENCE SITE SELECTION ..................................................................................................... 3-1 Reference Site Objectives .................................................................................................................. 3-1 Reference Site Evaluation Methods ................................................................................................. 3-1 Reference Sites Considered ............................................................................................................... 3-2 Reference Sites Selected .................................................................................................................... 3-6 Leo Carrillo .................................................................................................................................. 3-9 Sequit Point ................................................................................................................................ 3-11 El Pescador ................................................................................................................................ 3-12 El Matador ................................................................................................................................. 3-13 Reference Site Weakness and Corrective Action Framework ..................................................... 3-15 SAMPLING METHODS, DATA COLLECTION, AND ANALYSIS ............................................ 4-1 Monitoring Duration and Sampling Periods ................................................................................... 4-1 Feature Class Distribution and Areal Extent .................................................................................. 4-2 Intertidal and Supratidal Feature Class Mapping ......................................................................... 4-2 Subtidal Feature Class Mapping .................................................................................................. 4-5 Managing Feature Class Mapping Gaps ...................................................................................... 4-8 Habitat Sampling ............................................................................................................................. 4-10 Intertidal Habitat Sampling ........................................................................................................ 4-14 Subtidal Habitat Sampling ......................................................................................................... 4-23 Eelgrass Sampling ..................................................................................................................... 4-30 Sandy Subtidal Sampling ........................................................................................................... 4-31 Sampling Program Schedule, Coordination and Reporting ........................................................ 4-32 CRITERIA FOR DETECTING ADVERSE IMPACTS .................................................................. 5-1 Performance Criteria ........................................................................................................................ 5-1 Statistical Analysis of Change ..................................................................................................... 5-1 Assessment Variables .................................................................................................................. 5-4 Intertidal Habitat Feature Class Mapping .................................................................................... 5-4 Subtidal Habitat Feature Class Mapping ..................................................................................... 5-4 Intertidal Assessment Variables ................................................................................................... 5-5 Subtidal Assessment Variables .................................................................................................... 5-5 Determination of adverse Impacts ................................................................................................... 5-7 MITIGATION ...................................................................................................................................... 6-1 Adaptive Management ...................................................................................................................... 6-1 Adaptive Management Framework .............................................................................................. 6-1 Compensatory Mitigation ................................................................................................................. 6-3 November 2017 i Final Broad Beach Marine Habitat Monitoring and Mitigation Plan Habitat Specific Mitigation Plan ...................................................................................................... 6-3 CCC Mitigation Ratios ................................................................................................................ 6-4 Compensatory Mitigation Opportunities ..................................................................................... 6-4 Functions and Values of Habitat Types(s) To Be Rehabilitated, Enhanced and/or Preserved..... 6-5 Other Mitigation Considerations.................................................................................................. 6-7 Time Lapse Between Impacts And Expected Mitigation Success ............................................... 6-7 Responsible Parties ...................................................................................................................... 6-8 Estimated Mitigation Cost ........................................................................................................... 6-8 REFERENCES ..................................................................................................................................... 7-1 Appendix A: Special Condition 6 Language, Notice of Intent to Issue Permit, 4-15-0390, California Coastal Commission Appendix B: Conceptual Habitat Compensatory Mitigation Plan, Broad Beach and Dune Restoration Project, Michael Baker International (July 2017) Appendix C: Adaptive Management and Monitoring Plan, Moffatt & Nichol. 2017 Appendix D: Exhibit E, Monitoring Implementation Program, General Lease – Beach Replenishment and Protective Structure Use, Broad Beach Restoration Project, California State Lands Commission, 2016 November 2017 ii Final Broad Beach Marine Habitat Monitoring and Mitigation Plan LIST OF TABLES Table 2-1: Habitats and Feature Classes Delineated within Broad Beach Survey Area based on Composite Mapping Data Collected between 2014 and 2016 ..........................................................................2-7 Table 2-2: Comparison of Species Recorded at Broad Beach and Potential Reference