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2008 Bolsa Chica Restoration Monitoring Program

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2008 Bolsa Chica Restoration Monitoring Program 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 Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Figure 1-16. Avian survey zones........................................................................................................... 73 Figure 1-17. Avian abundance by guild at Bolsa Chica during 2008 surveys ...................................... 80 Figure 1-18. Avian abundance by habitat type at Bolsa Chica during 2008 surveys............................ 84 Figure 1-19. Belding’s Savannah sparrow territories (March and April 2008)..................................... 89 Figure 2-1. Predicted flood shoal area................................................................................................. 100 Figure 2-2. Full Tidal Basin inlet bathymetry ..................................................................................... 102 Figure 2-3. Full Tidal Basin accretion and erosion comparisons between surveys............................. 103 Figure 2-4. Net sediment accretion rate per month ............................................................................. 104 Figure 2-5a. Minimum daily tidal elevations in the Bolsa Chica Full Tidal Basin (FTB) and at the Los Angeles Outer Harbor (LAOH) between January 20, 2007 and December 31, 2008 ................... 109 Figure 2-5b. Daily differences in lower low tide elevations between the FTB and the LAOH .......... 109 Figure 2-6. Maximum spring low tide muting..................................................................................... 111 Figure 2-7. Example comparison of recorded tides (February 2007) at FTB with the ocean tides (LAOH).......................................................................................................................................... 112 Figure 2-8. Location map .................................................................................................................... 115 Figure 2-9. Beach profile data used in CCSTWS-OC......................................................................... 117 Figure 2-10. Beach profile survey operations...................................................................................... 119 Figure 2-11. May 2008 and October 2008 beach widths..................................................................... 124 Figure 2-12. Long-Term beach width changes, May 1963 to May 2008............................................ 125 Figure 2-13. Bolsa Chica monitoring period shoreline changes, October 2005
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