appendix b final 2008 biological surveys of los angeles and long ...

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2.0 Water Quality influenced by a combination of shallow water (4 m maximum depth), solar heating, and reduced mixing with inner and outer harbor waters (see station location in Figure 2.2-1). The Basin Plan does not specify water quality objectives for temperature. (Limitations on the temperatures of thermal discharges are covered under the Thermal Plan.) 2.3.2 Salinity Salinity values for surface, mid-depth, and bottom waters ranged from 33.0 to 33.6 parts per thousand (ppt) or practical salinity unit (PSU), 33.4 to 33.6 ppt, and 33.3 to 33.5 ppt, respectively (Table 2.3-2). Salinity typically increased with water depth, although the range of salinities at individual stations was relatively small (e.g., less than 0.5 ppt). The vertical salinity profiles for individual stations did not show any rapid changes in salinity with depth (i.e., pycnocline) or other obvious stratification as would be expected in these relatively shallow depths. The Basin Plan does not specify water quality objectives for salinity. 2.3.3 Density Density values for surface, mid-depth, and bottom waters ranged from 22.5 to 23.7 kilograms/cubic-meter (kg/m 3 ), 23.6 to 24.4 kg/m 3 and 23.4 to 24.8 kg/m 3 , respectively (Table 2.3-2). Density typically increased with water depth although the range of densities at individual stations was relatively small (e.g., approximately 0.5 kg/m 3 ), consistent with the salinity data which is a key component of density. Profiles for individual stations did not exhibit strong density stratification or other evidence of density layering. The Basin Plan does not specify water quality objectives for density. 2.3.4 Acidity/Alkalinity (pH) Average pH values for surface, mid-depth and bottom waters at individual stations were 7.37, 7.26 and 7.19 respectively (Table 2.3-2). Changes with depth in pH at individual stations typically were minimal, varying by 0.2 pH unit or less. However, differences between surface and bottom depths at some shallow and deep stations (e.g., 5 m and 20 m, respectively) were on the order of 0.2 pH units. There were no apparent gradients or consistent spatial patterns in pH conditions. The Basin Plan established an acceptable range for pH in bays or estuaries of 6.5 to 8.5 with a change in tolerance level of no more than 0.2 due to discharges. All pH values measured during the July 2008 survey were within this range. 2.3.5 Dissolved Oxygen DO concentrations ranged from 7.58 to 10.7 milligrams per liter (mg/L), 6.24 to 8.57 mg/L and 4.38 to 8.57 mg/L for surface, middle, and bottom depth waters, respectively (Table 2.3-2). DO concentrations were higher near the surface, decreasing with depth, with the lowest concentrations in the near-bottom waters. DO measurements at most stations indicated a well oxygenated water column (i.e., DO concentration above 5 mg/L). All surface water and middepth DO concentrations were above the 5 mg/L (Table 2.3-1). Near-bottom DO concentrations fell below 5 mg/L at three locations (LA8, 4.38 mg/L; LB1, 4.58 mg/L; and LB3, 4.94 mg/L). The Basin Plan specifies that the mean annual DO concentration of waters shall be 7 mg/L or greater with no event less that 5 mg/L, except when natural conditions cause lesser concentrations. The Basin Plan also specifies that the mean annual DO concentration in the 2008 Biological Surveys of Los Angeles and Long Beach Harbors 2–3 April 2010
2.0 Water Quality Outer Harbor area shall be 6 mg/L or higher. Thus, some of the measured DO concentrations were below the water quality objective. 2.3.6 Transmissivity Transmissivity (i.e., water clarity) in surface, mid-depth and bottom waters ranged from 37.5 to 76.5 percent transmittance (%), 45.1 to 78.1 %, and 14.4 to 75.0 %, respectively (Table 2.3-2). Generally, water clarity in mid-depth waters was relatively higher than surface and bottom waters. Water clarity at the surface (i.e., 1 m below the surface) was between 30% and 50% lower than mid-depth waters. Surface water clarity may have reflected the presence of plankton. The lower transmissivity values associated with bottom waters likely are attributable to resuspension of bottom sediments due to currents or turbulence from propeller wash. Station LA8 in the Seaplane Anchorage (4 m depth) had the lowest overall water clarity (i.e., 37.5 % [surface] and 14.4 % [bottom]), which likely reflected resuspension of bottom sediment by wave motions and natural turbulence at this shallow-water site. The Basin Plan does not provide a numerical water quality objective for transmissivity. Instead, the Basin Plan states that waters shall be free of changes in turbidity that cause a nuisance or adversely affect beneficial uses. The magnitude of the transmissivity values measured during the July 2008 is not expected to cause a nuisance or adversely affect beneficial uses. 2.4 SPATIAL VARIATIONS Water quality characteristics in the harbor complex did not exhibit pronounced spatial trends during the July 2008 survey. For example, the ranges in measured salinity, density, and pH values were small, indicating relatively uniform conditions across all of the water quality sampling locations. The ranges in measured temperature, transmissivity, and DO concentrations were comparatively larger than for salinity, density, and pH. Overall, there did not appear to be consistent patterns related to location (e.g., inner versus outer harbor) or water depth. However, a few examples of depth-related variations were noted and are discussed below. Surface water temperatures at two of the shallow water sites (LA8 and LA7) were several degrees warmer (22.7 to 23.5 °C) than surface water temperatures in other portions of the harbor. The higher surface water temperatures at these sites were probably due to decreased vertical mixing and reduced circulation in inner harbor areas, and they are typical for this location and season. Slightly lower salinity water (e.g., 32 ppt) occurred within the upper 2 m of the water column at stations along the Main Channel, including West Basin and Consolidated Slip (Stations LA14 and LA6). This lower salinity layer may reflect freshwater inputs from Dominguez Channel. Similar conditions were encountered during dry weather water quality sampling associated with the Dominguez Channel Estuary Modeling Study in 2004 (Everest International Consultants 2007). Additionally, reduced salinities were detected in surface waters at Station LB1 in the Long Beach Outer Harbor area (Figure 2.4-1). The lower salinity surface layer at these locations could reflect discharges from the Terminal Island Waste Treatment Plant discharge 2–4 2008 Biological Surveys of Los Angeles and Long Beach Harbors April 2010
Page 1 and 2: APPENDIX B FINAL 2008 BIOLOGICAL SU
Page 4: FINAL 2008 BIOLOGICAL SURVEYS OF LO
Page 7 and 8: Table of Contents 3.4.3 Summary of
Page 9 and 10: Table of Contents 8.2.1 Aerial Phot
Page 11 and 12: Table of Contents Table 3.4-2. Tabl
Page 13 and 14: Table of Contents Table 8.3-3. Tabl
Page 15 and 16: Table of Contents Figure 6.2-1. Rip
Page 17 and 18: Table of Contents This page intenti
Page 19 and 20: Executive Summary otter trawls to s
Page 21 and 22: Executive Summary Van Veen) and ana
Page 23 and 24: Executive Summary which was collect
Page 26 and 27: 1.0 Introduction 1.0 INTRODUCTION T
Page 28 and 29: 1.0 Introduction 1.4 STUDY OBJECTIV
Page 30 and 31: 1.0 Introduction Historical compari
Page 32 and 33: 1.0 Introduction Figure 1.1-2. Map
Page 34: CHAPTER 2 WATER QUALITY
Page 37: 2.0 Water Quality The CTD was deplo
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3.0 Adult and Juvenile Fishes Figur
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3.0 Adult and Juvenile Fishes Figur
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CHAPTER 4 ICHTHYOPLANKTON
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4.0 Ichthyoplankton studies (Horn a
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4.0 Ichthyoplankton more likely to
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4.0 Ichthyoplankton The results of
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4.0 Ichthyoplankton Table 4.3-1. To
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4.0 Ichthyoplankton Table 4.3-2. To
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4.0 Ichthyoplankton Table 4.3-4. We
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4.0 Ichthyoplankton Table 4.3-5. We
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4.0 Ichthyoplankton Table 4.3-6. Se
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4.0 Ichthyoplankton Table 4.5-1. Ar
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4.0 Ichthyoplankton LA05 LA14 2D St
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5.0 Benthic and Epibenthic Inverteb
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CHAPTER 6 RIPRAP BIOTA
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6.0 Riprap Biota diver collection m
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6.0 Riprap Biota relatively small b
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6.0 Riprap Biota sea cucumber (Para
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6.0 Riprap Biota polychaete worms.
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6.0 Riprap Biota Table 6.3-1. Mean
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6.0 Riprap Biota Figure 6.2-1. Ripr
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7.0 Kelp and Macroalgae 7.0 KELP AN
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7.0 Kelp and Macroalgae the laborat
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7.0 Kelp and Macroalgae sediment us
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7.0 Kelp and Macroalgae Overall, ou
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7.0 Kelp and Macroalgae pose a sign
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7.0 Kelp and Macroalgae Figure 7.2-
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CHAPTER 8 EELGRASS
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8.0 Eelgrass distribution of eelgra
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8.0 Eelgrass adjacent to most trans
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8.0 Eelgrass load on the plants was
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8.0 Eelgrass (Table 8.3-5), based o
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8.0 Eelgrass surveys. No eelgrass b
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8.0 Eelgrass Areas containing eelgr
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8.0 Eelgrass Seasonal patterns amon
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8.0 Eelgrass 2002) inferred that th
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8.0 Eelgrass Table 8.3-2. Spring 20
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8.0 Eelgrass Table 8.3-4. Fall 2008
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8.0 Eelgrass Table 8.3-12. Oceanic
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8.0 Eelgrass Figure 8.3-2. Eelgrass
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8.0 Eelgrass Figure 8.3-6. Spatial
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9.0 Birds 9.0 BIRDS 9.1 INTRODUCTIO
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9.0 Birds changes in species number
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9.0 Birds the Brown Pelican populat
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9.0 Birds 9.4.2.10 9.4.2.11 9.4.2.1
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9.0 Birds 9.5.1 Distribution and Ab
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9.0 Birds discussed in Section 9.4.
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9.0 Birds Angeles Harbor. The relat
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9.0 Birds Table 9.4-1. Percent Comp
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9.0 Birds Table 9.4-3. Nest Numbers
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9.0 Birds Table 9.5-2. Species Comp
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9.0 Birds Table 9.5-4. Percent Comp
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9.0 Birds Table 9.6-1. Historical C
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9.0 Birds 70 12000 60 10000 50 40 3
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9.0 Birds 3500 shallow water sandy
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9.0 Birds 40 35 30 riprap aerial Nu
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9.0 Birds Number Observed 3500 3000
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9.0 Birds Figure 9.5-1. Total numbe
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9.0 Birds Number of Individuals 400
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9.0 Birds 7000 Mean Number of Indiv
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CHAPTER 10 MARINE MAMMALS
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10.0 Marine Mammals Gray whales dif
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10.0 Marine Mammals This page inten
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11.0 References 11.0 REFERENCES Abb
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11.0 References Dennison, W.C. and
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11.0 References Jacques, D.L., C.S.
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11.0 References North, W.J. 1983. S
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APPENDIX A STATION LOCATIONS
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Appendix A Station Coordinates (NAD
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Appendix B (A) Temperature (°C), S
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APPENDIX C FISHES
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Appendix C Table C-1. Combined Fish
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Appendix C LA01 LA02 LA03 LA04 LA05
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Appendix C Table C-3. Otter Trawl C
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Appendix C Table C-5. Otter Trawl B
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Appendix C Table C-7. Otter Trawl B
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Appendix C Table C-8. Lampara Catch
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Appendix C Table C-10. Lampara Catc
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Appendix C Scientific Name Table C-
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Appendix C Table C-14. Beach Seine
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Appendix D Table D-1. Ichthyoplankt
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Appendix D fish eggs (undeveloped)
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Appendix D fish eggs unid. unidenti
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fish eggs unid. unidentified fish e
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Appendix D Eggs Oligocottus / Clino
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Appendix D Eggs Rhinogobiops nichol
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Appendix D Juvenile Eggs Heterostic
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Appendix D Eggs Liparis spp. snailf
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Appendix D Juvenile Eggs Heterostic
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Appendix D Table D-11. Ichthyoplank
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APPENDIX E INFAUNA
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Appendix E Taxon LA-1 LA-10 LA-11 L
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Appendix E Protothaca laciniata Tax
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Appendix E Taxon LA1 LA2 LA3 LA4 LA
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Appendix E Table E-4. Otter Trawl,
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Appendix E Taxon LA1 LA2 LA3 LA4 LA
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Appendix E Octopus sp. 1 Philine sp
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Appendix E This page intentionally
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Appendix F Table F-1. Total Abundan
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Appendix F LARR-1 LARR-2 LARR-3 LAR
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APPENDIX G KELP AND MACROALGAE
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Appendix G Date Survey Site Observe
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Appendix G Species T1 T2 T3 T4 T5 T
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Appendix H APPENDIX H-1 AVIAN ECOLO
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Appendix H Table H-1. Avian Ecologi
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Appendix H GUILD 8 - UPLAND BIRDS G
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Appendix H APPENDIX H-2 NUMBER OF I
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Appendix H Table H-2. December A 20
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Appendix H Table H-3. December B 20
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Appendix H Table H-4. January A 200
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Appendix H Table H-5. January B 200
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Appendix H Table H-6. February A 20
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Appendix H Table H-7. February B 20
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Appendix H Table H-8. March A 2008
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Appendix H Table H-9. March B 2008
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Appendix H Table H-10. April A 2008
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Appendix H Table H-11. May A 2008 S
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Appendix H Table H-13. July A 2008
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Appendix H Table H-15. August B 200
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Appendix H Table H-16. September A
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Appendix H Table H-17. September B
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Appendix H Species Totals Zones 1 2
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Appendix H Species Totals Zones 1 2
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Appendix H Zones Species Totals 1 2
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Appendix H Zones Species Totals 1 2
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Appendix H Date ELEGANT TERN — OB
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APPENDIX I MARINE MAMMALS
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Appendix I Common Survey Station/ N
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Appendix I Common Name Survey Type
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Appendix I This page intentionally
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