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Federal Register / Vol. 86, No. 195 / Wednesday, October 13, 2021 / Proposed Rules TABLE 2BULKHEAD PILE INSTALLATION ACTIVITY
Number of sheets pairs/
piles
Facility
Method of pile driving
Pile type
Pile Size
S45

Vibratory/Impact

S366

Impact
Vibratory
Vibratory/Impact

S499/Pier 2

Impact
Vibratory
Vibratory/Impact

LNG

Impact
Vibratory
Vibratory/Impact

Pier 01

Vibratory
Vibratory/Impact

Z-shaped Steel Sheet Pile.
Steel Pipe Pile
Steel H-pile
Z-shaped Steel Sheet Pile.
Steel pipe pile
Steel H-pile
Z-shaped Steel Sheet Pile.
Steel Pipe Pile
Steel H-pile
Z-shaped Steel Sheet Pile.
Steel H-pile
Z-shaped Steel Sheet Pile.

3.75 ft per pair/22.5in each.
30-in
14-in
3.75 ft per pair/22.5in each.
30-in diameter
14-in
5.25 ft per pair/31.5in each.
42-in
14-in
3.75 ft per pair/22.5in each.
14-in
3.75 ft per pair/22.5in each.

Steel H-pile

Vibratory
Total sheet piles pairs/pipe and Hpiles installed.

364/413.

Total days pile driving.

Strikes per pile
Vibratory driving minutes per pile
Maximum number of piles installed per day
Maximum number of pile driving days
80 pair

530

13

10

27

4
76
14 pair

530
NA
530

NA
10
13

2
12
10

4
13
5

15
14
70 pair

530
NA
530

NA
10
13

2
12
8

15
3 23

35
79
173 pair

530
NA
530

NA
10
13

4
12
10

18
14
58

164
27 pair

NA
530

10
13

12
10

28
9

14-in

26

NA

10

12

5

222

Legend: NA = not applicable, ft = foot; Start date of in-water work and duration are to be determined.

jspears on DSK121TN23PROD with PROPOSALS1

Pile installation would occur using land-based or barge-mounted cranes, as appropriate. Cranes would be equipped with both vibratory and impact hammers. Piles would be installed initially using vibratory means and then finished with impact hammers, as necessary. Impact hammers would also be used where obstructions or sediment conditions do not permit the efficient use of vibratory hammers. Impact hammers would utilize soft start techniques to minimize noise impacts in the water column. The Navy does not yet know what type/size of hammers would be used to complete the work.
For purposes of this analysis, underwater noise was modeled without accounting for potential noise minimization measures.
Proposed mitigation, monitoring, and reporting measures are described in detail later in this document please see Proposed Mitigation and Proposed Monitoring and Reporting.
Description of Marine Mammals in the Area of Specified Activities Sections 3 and 4 of the Navys application summarize available
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information regarding status and trends, distribution and habitat preferences, and behavior and life history, of the potentially affected species. Additional information regarding population trends and threats may be found in NMFSs Stock Assessment Reports SARs;
https www.fisheries.noaa.gov/
national/marine-mammal-protection/
marine-mammal-stock-assessments and more general information about these species e.g., physical and behavioral descriptions may be found on NMFSs website https
www.fisheries.noaa.gov/find-species.
Table 3 lists all species or stocks for which take is expected and proposed for authorization, and summarizes information related to the population or stock, including regulatory status under the MMPA and Endangered Species Act ESA and potential biological removal PBR, where known. For taxonomy, we follow Committee on Taxonomy 2021.
PBR is defined by the MMPA as the maximum number of animals, not including natural mortalities, that may be removed from a marine mammal stock while allowing that stock to reach
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or maintain its optimum sustainable population as described in NMFS
SARs. While no mortality is anticipated or authorized here, PBR and annual serious injury and mortality from anthropogenic sources are included here as gross indicators of the status of the species and other threats.
Marine mammal abundance estimates presented in this document represent the total number of individuals that make up a given stock or the total number estimated within a particular study or survey area. NMFS stock abundance estimates for most species represent the total estimate of individuals within the geographic area, if known, that comprises that stock. For some species, this geographic area may extend beyond U.S. waters. All managed stocks in this region are assessed in NMFSs U.S. Atlantic and Gulf of Mexico SARs e.g., Hayes et al. 2021.
All values presented in Table 3 are the most recent available at the time of publication and are available in the 2020 SARs Hayes et al. 2021.

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