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Federal Register / Vol. 86, No. 23 / Friday, February 5, 2021 / Notices Cofferdam Installation and Removal Marine mammal densities in the near shore export cable area were estimated from the 10 10 km habitat density blocks that contained the anticipated location of the cofferdam. Monthly marine mammal densities for the potential construction locations of the cofferdam are provided in Table 14. The
threshold distances at each location, in the months during which the cofferdam may be installed and extracted e.g., October through April. Several of the outer continental shelf and deeper water species that appear in the SFWF area are not included in the cofferdam species list because the densities were zero for those species.

maximum densities denoted by an asterisk were incorporated in the exposure modeling to obtain the most conservative estimates of potential take by Level A harassment or Level B
harassment.
The species listed in each respective density table represent animals that could be reasonably expected within the propagated Level B harassment
TABLE 14ESTIMATED DENSITIES ANIMALS/KM-2 USED FOR MODELING MARINE MAMMAL EXPOSURES WITHIN THE
AFFECTED AREA AND CONSTRUCTION SCHEDULE OF THE COFFERDAM INSTALLATION
Species 1

Jan
Fin whale
Minke whale
Sei whale
Humpback whale
North Atlantic right whale
Atlantic white-sided dolphin
Common dolphin
Common bottlenose dolphin
Harbor porpoise
Gray seal
Harbor seal

Feb
0.0001
0.0005
0.0001
0.0002
0.0014
0.0001
0.0003
0.0694
0.0007
0.3136
0.3136

0.0001
0.0008
0.0001
0.0002
0.0014
0.0000
0.0001
0.0296
0.0005
0.3136
0.3136

Mar
Apr
0.0002
0.0008
0.0001
0.0002
0.0013
0.0001
0.0001
0.0157
0.0005
0.3136
0.3136

May
0.0005
0.0000
0.0000
0.0000
0.0008
0.0002
0.0003
0.0474
0.0011
0.3136
0.3136

Oct
0.0002
0.0000
0.0000
0.0000
0.0003
0.0003
0.0007
0.3625
0.0007
0.3136
0.3136

Nov
0.0002
0.0000
0.0000
0.0000
0.0000
0.0003
0.0007
0.4822
0.0026
0.3136
0.3136

0.0001
0.0005
0.0000
0.0000
0.0002
0.0003
0.0010
0.2614
0.0003
0.3136
0.3136

Dec 0.0001
0.0005
0.0001
0.0002
0.0008
0.0002
0.0008
0.0809
0.0006
0.3136
0.3136

Denotes density used for take estimates.
1 Only species with potential exposures are listed.

HRG Surveys Densities for HRG surveys were combined for the wind farm area interarray cables and the export cable route using density blocks that encompassed
those areas. The densities used for HRG
surveys are provided in Table 15.
Average annual, rather than maximum monthly, densities were estimated to account for spatial variability in the
distribution of marine mammals throughout the SFWF and SFEC and temporal variability in distribution over the 12-month timeframe during which HRG surveys would occur.

TABLE 15ESTIMATED DENSITIES ANIMALS/KM-2 OF MARINE MAMMALS WITHIN THE HIGH RESOLUTION GEOPHYSICAL
SURVEY AREA
Export cable route and inter-array cables Species
Jan
Feb
Mar
Apr
May
Jun
July
Aug
Sept
Oct
Nov
Dec
Fin whale
Minke whale
Sei whale
Humpback whale
North Atlantic right whale
Sperm whale
Atlantic white-sided dolphin
Atlantic spotted dolphin
Common dolphin
Common bottlenose dolphin
Rissos dolphin
Long-finned pilot whale
Harbor porpoise
Gray seal
Harbor seal

0.0020
0.0006
0.0001
0.0008
0.0038
0.0001
0.0227
0.0001
0.0218
0.0081
0.0000
0.0033
0.0871
0.0151
0.0151

0.0015
0.0007
0.0001
0.0007
0.0053
0.0001
0.0103
0.0001
0.0100
0.0033
0.0000
0.0033
0.0584
0.0151
0.0151

0.0016
0.0006
0.0001
0.0008
0.0060
0.0001
0.0078
0.0001
0.0085
0.0014
0.0000
0.0033
0.0475
0.0151
0.0151

0.0027
0.0004
0.0002
0.0006
0.0054
0.0001
0.0172
0.0001
0.0182
0.0035
0.0000
0.0033
0.0964
0.0151
0.0151

0.0022
0.0005
0.0004
0.0009
0.0016
0.0001
0.0326
0.0001
0.0568
0.0241
0.0000
0.0033
0.0547
0.0151
0.0151

0.0022
0.0006
0.0002
0.0013
0.0001
0.0001
0.0276
0.0001
0.0645
0.0324
0.0000
0.0033
0.0182
0.0030
0.0030

0.0025
0.0006
0.0001
0.0008
0.0000
0.0001
0.0178
0.0001
0.0417
0.0544
0.0000
0.0033
0.0037
0.0030
0.0030

0.0024
0.0004
0.0000
0.0010
0.0000
0.0001
0.0126
0.0001
0.0456
0.0405
0.0000
0.0033
0.0014
0.0030
0.0030

0.0018
0.0002
0.0000
0.0013
0.0000
0.0001
0.0202
0.0001
0.0468
0.0393
0.0000
0.0033
0.0024
0.0151
0.0151

0.0018
0.0001
0.0000
0.0013
0.0000
0.0001
0.0267
0.0001
0.0538
0.0392
0.0000
0.0033
0.0150
0.0151
0.0151

0.0016
0.0006
0.0000
0.0013
0.0003
0.0001
0.0298
0.0001
0.0600
0.0271
0.0000
0.0033
0.0046
0.0151
0.0151

0.0022
0.0006
0.0001
0.0007
0.0017
0.0001
0.0352
0.0001
0.0506
0.0108
0.0000
0.0033
0.0482
0.0151
0.0151

Annual average
0.0020
0.0005
0.0001
0.0010
0.0020
0.0001
0.0217
0.0001
0.0399
0.0237
0.0000
0.0033
0.0365
0.0121
0.0121

Annual average density used for take estimates.

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Take Calculation and Estimation Below is a description of how the information provided above is brought together to produce a quantitative take estimate. The following steps were performed to estimate the potential numbers of marine mammal exposures above Level A harassment and Level B
harassment thresholds as a result of the proposed activities.

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Monopile Installation JASCOs Animal Simulation Model Including Noise Exposure JASMINE
animal movement model was used to predict the probability of marine mammal exposure to impact pile driving sound. Sound exposure models like JASMINE use simulated animals also known as animats to forecast behaviors of animals in new situations and locations based on previously documented behaviors of those animals.
The predicted 3D sound fields i.e., the
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output of the acoustic modeling process described earlier are sampled by animats using movement rules derived from animal observations. The output of the simulation is the exposure history for each animat within the simulation.
The precise location of animats and their pathways are not known prior to a project, therefore a repeated random sampling technique Monte Carlo is used to estimate exposure probability with many animats and randomized starting positions. The probability of an
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