Federal Register - February 5, 2021
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Source: Federal Register
8519
Federal Register / Vol. 86, No. 23 / Friday, February 5, 2021 / Notices
TABLE 16MODELED POTENTIAL LEVEL A HARASSMENT EXPOSURES 1 DUE TO IMPACT PILE DRIVING USING THE MAXIMUM DESIGN SCENARIO WITH THE INCLUSION OF 1 DIFFICULT PILE AND 0, 6, 10, 12, AND 15 dB BROADBAND ATTENUATION
0 dB
attenuation
Species
6 dB
attenuation
SPLpk
SELcum
SELcum
10 dB
attenuation
SPLpk
SELcum
12 dB
attenuation
SPLpk
SELcum
15 dB
attenuation
SPLpk
SELcum
SPLpk
Low-Frequency Cetaceans Fin whale
Minke whale 2
Sei whale 3
Humpback whale 2
North Atlantic right whale 2
Blue whale
7
7
1
21
4
<1
<1 <1 <1 <1 <1 <1
3
3
<1
9
1
<1
<1 <1 <1 <1 <1 <1
1
1
<1
4
<1
<1
<1 <1 <1 <1 <1 <1
1
1
<1
3
<1
<1
<1 <1 <1 <1 <1 <1
<1
<1
<1
3
<1
<1
<1 <1 <1 <1 <1 <1
<1 <1 <1 <1 <1 <1 <1
<1 <1 <1 <1 <1 <1 <1
<1 <1 <1 <1 <1 <1 <1
<1 <1 <1 <1 <1 <1 <1
<1 <1 <1 <1 <1 <1 <1
<1 <1 <1 <1 <1 <1 <1
71
3
1
3
<1
1
<1 <1
<1 <1
<1 <1
<1 <1
<1 <1
<1 <1
Mid-Frequency Cetaceans Sperm whale
Atlantic spotted dolphin 4
Atlantic white sided dolphin 4
Bottlenose dolphin
Common dolphin 4
Rissos dolphin 4
Pilot whale 5
<1 <1 <1 <1 <1 <1 <1
<1 <1 <1 <1 <1 <1 <1
<1 <1 <1 <1 <1 <1 <1
<1 <1 <1 <1 <1 <1 <1
High-Frequency Cetaceans Harbor porpoise
33
23
4
7
Pinnipeds in Water Gray seal 6
Harbor seal
6
8
<1
1
1
2
<1 <1
dB = decibel; SELcum = sound exposure level in units of dB referenced to 1 micropascal squared second; SPLpk = peak sound pressure level in units of dB referenced to 1 micropascal.
1 The maximum density available for any month was used for each species to estimate the maximum potential exposures i.e., exposure estimates for all species are not for the same month.
2 Subset of fin whale behaviors used to approximate model parameters.
3 Fin whale used as proxy species for exposure modeling.
4 Subset of sperm whale and Atlantic spotted dolphin behaviors used to approximate model parameters.
5 Subset of sperm whale behaviors used to approximate model parameters.
6 Harbor seal used as proxy species for exposure modeling.
7 Calculated exposures with 10 dB for harbor porpoises were <1 but >0.5; therefore they were rounded up to the nearest whole number.
Again, only the estimated Level B
harassment exposures for the maximum
design pile driving schedule are presented here Table 17.
TABLE 17MODELED POTENTIAL LEVEL B HARASSMENT EXPOSURES 1 DUE TO IMPACT PILE DRIVING USING THE
MAXIMUM DESIGN SCENARIO WITH 1 DIFFICULT PILE AND 0, 6, 10, 12, AND 15 dB BROADBAND ATTENUATION
Level B exposures by noise attenuation level
jbell on DSKJLSW7X2PROD with NOTICES2
Species
0 dB
attenuation
Low-Frequency Cetaceans:
Fin whale
Minke whale 2
Sei whale 3
Humpback whale 2
North Atlantic right whale 2
Blue whale
Mid-Frequency Cetaceans:
Sperm whale
Atlantic spotted dolphin 4
Atlantic white sided dolphin 4
Bottlenose dolphin
Common dolphin 4
Rissos dolphin 4
Pilot whale 5
High-Frequency Cetaceans:
Harbor porpoise
Pinnipeds in Water:
Gray seal 6
Harbor seal
6 dB
attenuation
10 dB
attenuation
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15 dB
attenuation
21
27
<1
26
16
<1
10
15
<1
13
7
<1
6
10
<1
8
4
<1
5
8
<1
7
3
<1
4
6
<1
6
3
<1
<1
6
322
1,261
2
212
<1
<1
3
152
459
1
85
<1
<1
2
107
197
<1
43
<1
<1
1
85
148
<1
34
<1
<1
<1
48
73
<1
14
<1
272
129
78
67
40
307
319
116
119
60
54
52
45
28
28
dB = decibel.
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12 dB
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