2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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Bolsa Chica Lowlands Restoration Project Monitoring Program 2008 Annual Report Prepared for: California State Lands Commission 100 Howe Avenue, Suite 100 South Sacramento, CA 95825-8202 Prepared by: Merkel & Associates 5434 Ruffin Road San Diego, CA 92123 Keith Merkel & Rachel Woodfield with: Moffatt & Nichol Engineers Coastal Frontiers Corporation Chambers Group
Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report TABLE OF CONTENTS Executive Summary................................................................................................................................ 1 Introduction........................................................................................................................................... 11 I. Ecological Monitoring Program ..................................................................................................... 17 1.1. Vegetation/Habitat Monitoring .................................................................................................................................. 17 1.2. Soils/Sediment Monitoring......................................................................................................................................... 33 1.3. Fish Community Monitoring...................................................................................................................................... 37 1.4. Benthic Monitoring .................................................................................................................................................... 55 1.5. Water Quality Monitoring .......................................................................................................................................... 66 1.6. Avian Monitoring....................................................................................................................................................... 72 General Avian Monitoring ............................................................................................................................................. 72 Light-footed Clapper Rail Monitoring ........................................................................................................................... 87 Belding’s Savannah Sparrow Monitoring ...................................................................................................................... 87 California Least Tern and Western Snowy Plover Monitoring ...................................................................................... 91 1.7. Non-native Invasive Species ....................................................................................................................................... 96 II. Physical Monitoring Program ....................................................................................................... 99 2.1. Inlet Flood Shoal ......................................................................................................................................................... 99 2.2. Tidal Monitoring ....................................................................................................................................................... 107 2.3. Beach Monitoring...................................................................................................................................................... 114 III. Maintenance Dredging Program ................................................................................................ 135 3.1 Dredging Triggers ...................................................................................................................................................... 136 3.2 Trigger Analysis......................................................................................................................................................... 137 3.3 Dredge Triggers - Conclusions and Recommendations ............................................................................................. 140 3.4 Maintenance Dredging Plan ....................................................................................................................................... 141 References............................................................................................................................................ 143 LIST OF FIGURES Figure 0-1. Site locator and vicinity map .............................................................................................. 15 Figure 0-2. Schedule of Bolsa Chica monitoring activities................................................................... 16 Figure 1-1. Monitoring stations ............................................................................................................. 18 Figure 1-2. Vegetation and soil monitoring locations ........................................................................... 20 Figure 1-3. Habitat map (May 2008)..................................................................................................... 22 Figure 1-4. Full Tidal Basin cordgrass distribution............................................................................... 24 Figure 1-5. Full Tidal Basin eelgrass distribution ................................................................................. 26 Figure 1-6. Mean percent cover of native and non-native vegetation by survey area (2008) ............... 29 Figure 1-7. Fisheries sampling locations............................................................................................... 39 Figure 1-8. Mean fish density by quarter for large beach seine, otter trawl, and purse seine at Stations 1 and 2 in the Full Tidal Basin......................................................................................................... 45 Figure 1-9. Mean fish biomass by quarter for large beach seine, otter trawl, and purse seine at Stations 1 and 2 in the Full Tidal Basin......................................................................................................... 47 Figure 1-10. Size class distribution of topsmelt, slough anchovy, kelp bass, and California killifish in the Full Tidal Basin in 2008............................................................................................................. 53 Figure 1-11. Benthic sampling stations ................................................................................................. 56 Figure 1-12. Mean infauna density and biomass in January and July 2008 by station and tidal elevation .......................................................................................................................................................... 61 Figure 1-13. Full Tidal Basin water quality data - January 2008 .......................................................... 68 Figure 1-14. Full Tidal Basin water quality data - April 2008 .............................................................. 69 Figure 1-15. Full Tidal Basin water quality data - July 2008................................................................ 70 Merkel & Associates, Inc. i
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22 Temperature 20 Temperature (C) 1
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PM 50 66 47 Full Tidal Basin Future
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Aug06 to Jan07 Jan07 to Jun07 assum
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Total Future Full Tidal Basin FFTB
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Western Snowy Plover Nesting at Bol
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