Takes of Marine Mammals Incidental to Specified Activities; Taking Marine Mammals Incidental to Marine Site Characterization Surveys Off New York, New Jersey, Delaware, and Maryland

AGENCY:

National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce.

ACTION:

Notice; proposed incidental harassment authorization; request for comments on proposed authorization and possible renewal.

SUMMARY:

NMFS has received a request from Atlantic Shores Offshore Wind, LLC (Atlantic Shores) for authorization to take marine mammals incidental to marine site characterization surveys in waters off of New York, New Jersey, Delaware, and Maryland, including in the Bureau of Ocean Energy Management (BOEM) Commercial Lease of Submerged Lands for Renewable Energy Development on the Outer Continental Shelf (OCS) Lease Areas OCS–A 0499, OCS–A 0541, OCS–A 0549, and associated export cable corridor (ECC) areas. Pursuant to the Marine Mammal Protection Act (MMPA), NMFS is requesting comments on its proposal to issue an incidental harassment authorization (IHA) to incidentally take marine mammals during the specified activities. NMFS is also requesting comments on a possible one-time, 1-year renewal that could be issued under certain circumstances and if all requirements are met, as described in Request for Public Comments at the end of this notice. NMFS will consider public comments prior to making any final decision on the issuance of the requested MMPA authorization and agency responses will be summarized in the final notice of our decision.

DATES:

Comments and information must be received no later than February 5, 2024.

ADDRESSES:

Comments should be addressed to Jolie Harrison, Chief, Permits and Conservation Division, Office of Protected Resources, National Marine Fisheries Service and should be submitted via email to ITP.clevenstine@noaa.gov. Electronic copies of the application and supporting documents, as well as a list of the references cited

in this document, may be obtained online at: https://www.fisheries.noaa.gov/national/marine-mammal-protection/incidental-take-authorizations-other-energy-activities-renewable. In case of problems accessing these documents, please call the contact listed below.

Instructions: NMFS is not responsible for comments sent by any other method, to any other address or individual, or received after the end of the comment period. Comments, including all attachments, must not exceed a 25-megabyte file size. All comments received are a part of the public record and will generally be posted online at https://www.fisheries.noaa.gov/national/marine-mammal-protection/incidental-take-authorizations-other-energy-activities-renewable without change. All personal identifying information ( e.g., name, address) voluntarily submitted by the commenter may be publicly accessible. Do not submit confidential business information or otherwise sensitive or protected information.

FOR FURTHER INFORMATION CONTACT:

Alyssa Clevenstine, Office of Protected Resources, NMFS, (301) 427–8401.

SUPPLEMENTARY INFORMATION:

Background

The MMPA prohibits the “take” of marine mammals, with certain exceptions. Sections 101(a)(5)(A) and (D) of the MMPA (16 U.S.C. 1361 et seq.) direct the Secretary of Commerce (as delegated to NMFS) to allow, upon request, the incidental, but not intentional, taking of small numbers of marine mammals by U.S. citizens who engage in a specified activity (other than commercial fishing) within a specified geographical region if certain findings are made and either regulations are proposed or, if the taking is limited to harassment, a notice of a proposed IHA is provided to the public for review.

Authorization for incidental takings shall be granted if NMFS finds that the taking will have a negligible impact on the species or stock(s) and will not have an unmitigable adverse impact on the availability of the species or stock(s) for taking for subsistence uses (where relevant). Further, NMFS must prescribe the permissible methods of taking and other “means of effecting the least practicable adverse impact” on the affected species or stocks and their habitat, paying particular attention to rookeries, mating grounds, and areas of similar significance, and on the availability of the species or stocks for taking for certain subsistence uses (referred to in shorthand as “mitigation”); and requirements pertaining to the mitigation, monitoring and reporting of the takings are set forth. The definitions of all applicable MMPA statutory terms cited above are included in the relevant sections below.

National Environmental Policy Act

To comply with the National Environmental Policy Act of 1969 (NEPA; 42 U.S.C. 4321 et seq.) and NOAA Administrative Order (NAO) 216–6A, NMFS must review our proposed action ( i.e., the issuance of an IHA) with respect to potential impacts on the human environment.

This action is consistent with categories of activities identified in Categorical Exclusion B4 (IHAs with no anticipated serious injury or mortality) of the Companion Manual for NAO 216–6A, which do not individually or cumulatively have the potential for significant impacts on the quality of the human environment and for which we have not identified any extraordinary circumstances that would preclude this categorical exclusion. Accordingly, NMFS has preliminarily determined that the issuance of the proposed IHA qualifies to be categorically excluded from further NEPA review.

We will review all comments submitted in response to this notice prior to concluding our NEPA process or making a final decision on the IHA request.

Summary of Request

On August 31, 2023, NMFS received a request from Atlantic Shores for an IHA to take marine mammals incidental to conducting marine site characterization surveys in waters off of New York, New Jersey, Delaware, and Maryland, specifically within BOEM Lease Areas OCS–A 0499, OCS–A 0541, OCS–A 0549, and associated ECC areas. Following NMFS' review of the application, Atlantic Shores submitted revised versions on October 11 and November 17, 2023. The application was deemed adequate and complete on November 20, 2023. Atlantic Shores' request is for take of small numbers of 14 species (15 stocks) of marine mammals by Level B harassment. Neither Atlantic Shores nor NMFS expect serious injury or mortality to result from this activity and, therefore, an IHA is appropriate.

NMFS previously issued IHAs to Atlantic Shores for similar work (85 FR 21198, April 16, 2020; 86 FR 21289, April 22, 2021; 87 FR 24103, April 20, 2022; 87 FR 50293, August 10, 2022; 88 FR 38821, June 9, 2023; 88 FR 54575, August 10, 2023). Atlantic Shores complied with all the requirements ( e.g., mitigation, monitoring, and reporting) of the previous IHAs and did not exceed authorized levels of take under previous IHAs issued for surveys offshore of New York and New Jersey. These previous monitoring results are available to the public on our website: https://www.fisheries.noaa.gov/action/incidental-take-authorization-atlantic-shores-offshore-wind-llc-marine-site-characterization and https://www.fisheries.noaa.gov/action/incidental-take-authorization-atlantic-shores-offshore-wind-bight-llcs-marine-site.

Description of Proposed Activity

Overview

Atlantic Shores proposes to conduct marine site characterization surveys, including high-resolution geophysical (HRG) surveys, in waters off of New York, New Jersey, Delaware, and Maryland, specifically within BOEM Lease Areas OCS–A 0499, OCS–A 0541, OCS–A 0549, and associated ECC areas, collectively considered the Survey Area.

Atlantic Shores currently has two active IHAs associated with ongoing HRG survey activities: one in BOEM Lease Areas OCS–A 0499 and OCS–A 0549 effective June 9, 2023 through June 8, 2024 (88 FR 38821) and another in BOEM Lease Area OCS–A 0541 effective August 10, 2023 through August 9, 2024 (88 FR 54575). The purpose of the IHA request addressed herein is to combine all ongoing HRG survey activities, including remaining survey activity associated with the two existing IHAs as well as new activity, under a single IHA. The new activity includes additional areas not currently covered under either currently active Atlantic Shores HRG survey IHAs. If NMFS ultimately makes the required determinations and issues the requested IHA, NMFS will concurrently modify the effective dates of the two active IHAs to reflect an end date that is one day earlier in time than the start date of the requested IHA.

The proposed marine site characterization surveys are designed to obtain data sufficient to meet BOEM guidelines for providing geophysical, geotechnical, and geohazard information for site assessment plan surveys and/or construction and operations plan development. The objective of the surveys is to support the site characterization, siting, and engineering design of offshore wind project facilities including wind turbine generators, offshore substations, and submarine cables within the Survey Area. Up to two vessels may conduct survey efforts concurrently. Underwater sound resulting from Atlantic Shores' marine site characterization survey activities, specifically HRG surveys, have the potential to result in incidental take of marine mammals in the form of Level B harassment.

Dates and Duration

The proposed activity is planned to begin on April 1, 2024. The proposed surveys are estimated to require a maximum of 300 survey days within a single year across a maximum of two vessels, which would include one vessel operating nearshore (less than 10 meters (m; 33 feet (ft)) depth) and one vessel operating offshore (greater than 10 m (33 ft) depth). The survey days are proposed to occur any month throughout the year as the exact timing of the surveys during the year is not yet certain. A “survey day” is defined as a 24-hour (hr) activity period in which an active acoustic sound source is used offshore and a 12-hr activity period when a vessel is operating nearshore. Surveyed at a speed of approximately 3.5 knots (kn; 6.5 kilometer (km) per hr (km/hr)), it is expected that the nearshore vessel would cover approximately 30 km (18.6 miles (mi)) of trackline per day, and the offshore vessel would cover approximately 140 km (87 mi) of trackline per day, based on Atlantic Shores' data acquisition efficiency expectations.

Specific Geographic Region

Atlantic Shores' proposed activities would occur in the Northwest Atlantic Ocean within Federal and State waters off of New York, New Jersey, Delaware, and Maryland in BOEM Lease Areas OCS–A 0499, OCS–A 0541, OCS–A 0549, and along the associated ECC areas (Figure 1). Overall, the Survey Area is approximately 20,251 square kilometers (km²; 7,819 mi²) and extends from the shoreline to approximately 74 km (46 mi) offshore and a maximum depth of approximately 60 m (197 ft).

Detailed Description of the Specified Activity

Atlantic Shores' marine site characterization surveys within the Survey Area include geotechnical and geophysical surveys, including depth sounding to determine water depth, site bathymetry, and general seafloor topography using a single beam and multibeam echosounder (MBES); magnetic intensity measurements using a gradiometer; seafloor imaging using a side scan sonar; shallow penetration sub-bottom profilers (SBPs; parametric); and a medium penetration SBP (sparker). NMFS does not expect the following acoustic sources to present a reasonably anticipated risk of causing incidental take of marine mammals, and these activities are not discussed further in this notice:

• Single and MBES and side-scan sonars are used to determine water depths and general seafloor topography. The proposed MBES and side-scan sonar both have operating frequencies greater than 180 kilohertz (kHz) and are, therefore, outside the general hearing range of marine mammals.

• Gradiometers are used to detect local variations in regional magnetic field from geological strata and potential ferrous objects on and below the seafloor. The proposed gradiometer has an operating frequency greater than 180 kHz and is, therefore, outside the general hearing range of marine mammals.
• Parametric SBPs are shallow penetration non-impulsive sources used to map the near-surface stratigraphy (soil down to 5 m) of sediment below seabed and can provide high data density in subsurface profiles that are typically required for cable routes, very shallow water, and archaeological surveys. These sources generate short, very narrow-beam (1 to 3.5 degrees (°)) signals at high frequencies (generally around 85–115 kHz). The narrow beamwidth significantly reduces the potential that a marine mammal could be exposed to the signal while the high frequency of operation means that the signal is rapidly attenuated in seawater (and cannot be heard by mysticetes). These sources are typically deployed on a pole rather than towed behind the vessel.

Atlantic Shores proposes to use a sparker during HRG survey activities that has the potential to cause incidental take of marine mammals. Sparkers are medium penetration impulsive sources used to map deep subsurface stratigraphy (soils down to at least 100 m (328 ft) below the seabed in sand and at least 125 m (410 ft) below the seabed in mixed sediments). Sparkers create omnidirectional acoustic pulses from 50 hertz (Hz) to 4 kHz, are typically towed behind the vessel, and may be operated with different numbers of electrode tips to allow tuning of the acoustic waveform for specific applications. There is one sparker system planned for use: GeoMarine Geo-Source 400, which would collect two-dimensional (2D) single-channel ultra-high resolution seismic (SUHRS) data while operating 400 tips at a power level of 400 Joules (J; table 2).

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 application summarize available information regarding status and trends, distribution and habitat preferences, and behavior and life history of the potentially affected species. NMFS fully considered all of this information, and we refer the reader to these descriptions instead of reprinting the information. Additional information regarding population trends and threats may be found in NMFS' 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 NMFS' website ( https://www.fisheries.noaa.gov/find-species ).

Table 3 lists all species or stocks for which take is expected and proposed to be authorized for this activity 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. 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 or maintain its optimum sustainable population (as described in NMFS' SARs). While no serious injury or mortality is anticipated or proposed to be authorized here, PBR and annual serious injury and mortality (annual M/SI) from anthropogenic sources are included here as gross indicators of the status of the species or stocks 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 NMFS' U.S. 2022 SARs. All values presented in table 3 are the most recent available at the time of publication and are available online at: https://www.fisheries.noaa.gov/national/marine-mammal-protection/marine-mammal-stock-assessments.

As indicated above, all 14 species (15 managed stocks) in table 3 temporally and spatially co-occur with the proposed activity to the degree that take is reasonably likely to occur. While other species have been documented in the area (see table 3–1 of the IHA application), the temporal and/or spatial occurrence of these species is such that take is not expected to occur, and they are not discussed further.

North Atlantic Right Whale

North Atlantic right whales (NARW) range from calving grounds in the southeastern United States to feeding grounds in New England waters and into Canadian waters (Hayes et al., 2023). They are observed year round in the Mid-Atlantic Bight, and surveys have demonstrated the existence of seven areas where NARW congregate seasonally in Georges Bank, off Cape Cod, and in Massachusetts Bay (Hayes et al., 2023). In the late fall months ( e.g., October), NARW are generally thought to depart from the feeding grounds in the North Atlantic and move south to their calving grounds off Georgia and Florida. However, recent research indicates our understanding of their movement patterns remains incomplete (Davis et al., 2017). A review of passive acoustic monitoring data from 2004 to 2014 throughout the western North Atlantic demonstrated nearly continuous year-round NARW presence across their entire habitat range (for at least some individuals), including in locations previously thought of as migratory corridors, suggesting that not all of the population undergoes a consistent annual migration (Davis et al., 2017). Given that Atlantic Shores' surveys would be concentrated in the New York Bight and Mid-Atlantic Bight, some NARW may be present year round. However, the majority of NARW in the vicinity of the Survey Area are likely to be transient, migrating through the area.

Recent aerial surveys in the New York Bight showed NARW in the proposed Survey Area in the winter and spring, preferring deeper waters near the shelf break (NARW observed in depths ranging from 33–1,041 m) but were observed throughout the aerial survey area (Zoidis et al., 2021, Robinson et al., 2021). Similarly, passive acoustic data collected from 2018 to 2020 in the New York Bight showed detections of NARW throughout the year (Estabrook et al., 2021). Seasonally, NARW acoustic presence was highest in the fall. NARW can be anticipated to occur in the proposed Survey Area year-round but with lower levels in the summer from July–September.

Since 2010, the NARW population has been in decline (Pace III et al., 2017), with a 40 percent decrease in calving rate (Kraus et al., 2016). In 2018, no new NARW calves were documented in their calving grounds; this represented the first time since annual NOAA aerial surveys began in 1989 that no new NARW calves were observed. Calf numbers have increased since 2018 with 20 NARW calves documented in 2021 and 15 in 2022.

Elevated NARW mortalities have occurred since June 7, 2017, along the U.S. and Canadian coast. This event has been declared an unusual mortality event (UME), with human interactions, including entanglement in fixed fishing gear and vessel strikes, implicated in at least 60 of the mortalities or serious injuries thus far. As of October 4, 2023, a total of 121 confirmed cases of mortality, serious injury, or morbidity (sublethal injury or illness) have been documented. The preliminary cause of most of these cases is from rope entanglements or vessel strikes. More information is available online at: https://www.fisheries.noaa.gov/national/marine-life-distress/2017-2023- north-atlantic-right-whale-unusual-mortality-event.

The proposed Survey Area is within a migratory corridor biologically important area (BIA) for NARW that extends from Massachusetts to Florida (LaBrecque et al., 2015). There is possible migratory behavior that could occur in this area between November and April. Off the coast of New Jersey, the migratory BIA extends from the coast to beyond the shelf break.

NMFS' regulations at 50 CFR 224.105 designated nearshore waters of the Mid-Atlantic Bight as Mid-Atlantic U.S. Seasonal Management Areas (SMA) for NARW in 2008. SMAs were developed to reduce the threat of collisions between ships and NARW around their migratory route and calving grounds. The New York/New Jersey SMA, which occurs in the New York Bight, is in the proposed Survey Area and is active from November 1 through April 30 of each year. Within SMAs, the regulations require a mandatory vessel speed (less than 10 kn (18.52 km/hr)) or 5.14 m/sec for all vessels longer than 19.8 m (65 ft).

On August 1, 2022, NMFS announced proposed changes to the existing NARW vessel speed regulations to further reduce the likelihood of mortalities and serious injuries to endangered right whales from vessel collisions, which are a leading cause of the species' decline and a primary factor in an ongoing Unusual Mortality Event (87 FR 46921, August 1, 2022). Should a final vessel speed rule be issued and become effective during the effective period of this IHA (or any other MMPA incidental take authorization), the authorization holder would be required to comply with any and all applicable requirements contained within the final rule. Specifically, where measures in any final vessel speed rule are more protective or restrictive than those in this or any other MMPA authorization, authorization holders would be required to comply with the requirements of the rule. Alternatively, where measures in this or any other MMPA authorization are more restrictive or protective than those in any final vessel speed rule, the measures in the MMPA authorization would remain in place. These changes would become effective immediately upon the effective date of any final vessel speed rule and would not require any further action on NMFS's part.

Fin Whale

Fin whales are present north of 35° N latitude in every season and are broadly distributed throughout the western North Atlantic for most of the year (Hayes et al., 2022). They are typically found in small groups of up to five individuals (Brueggeman et al., 1987). The main threats to fin whales are fishery interactions and vessel collisions (Hayes et al., 2022).

The western North Atlantic stock of fin whales includes the area from central Virginia to Newfoundland/Labrador, Canada. This region is primarily a feeding ground for this migratory species that tend to calve and breed in lower latitudes or offshore. There is currently no critical habitat designated for this species.

Aerial surveys in the New York Bight observed fin whales year-round throughout the proposed Survey Area, but they preferred deeper waters near the shelf break (Robinson et al., 2021). Passive acoustic data from 2018–2020 also detected fin whales throughout the year (Estabrook et al., 2021).

Humpback Whale

On September 8, 2016, NMFS divided the once single species of humpback whales into 14 distinct population segments (DPSs), removed the current species-level listing, and, instead, listed four DPSs as endangered and one DPS as threatened (81 FR 62259, September 8, 2016). The remaining nine DPSs were not listed. The West Indies DPS, which is not listed under the ESA, is the only DPS of humpback whale that is expected to occur in the Survey Area. Members of the West Indies DPS disperse to multiple western North Atlantic feeding populations, including the Gulf of Maine stock designated under the MMPA. Whales occurring in the proposed survey area are considered to be from the West Indies DPS but are not necessarily from the Gulf of Maine stock. Barco et al. (2002) estimated that, based on photo-identification, only 39 percent of individual humpback whales observed along the mid- and south Atlantic U.S. coast are from the Gulf of Maine stock. Bettridge et al. (2015) estimated the size of this population at 12,312 (95 percent confidence interval (CI) 8,688–15,954) whales in 2004–2005, which is consistent with previous population estimates of approximately 10,000–11,000 whales (Stevick et al., 2003, Smith et al., 1999) and the increasing trend for the West Indies DPS (Bettridge et al., 2015).

Humpback whales utilize the mid-Atlantic as a migration pathway between calving/mating grounds to the south and feeding grounds in the north (Waring et al., 2007a, Waring et al., 2007b). A key question with regard to humpback whales off the Mid-Atlantic States is to which feeding population whales in these waters belong.

Since January 2016, elevated humpback whale mortalities have occurred along the Atlantic coast from Maine to Florida. Partial or full necropsy examinations have been conducted on approximately half of the 209 known cases (as of November 2, 2023). Of the whales examined, about 40 percent had evidence of human interaction, either vessel strike or entanglement. While a portion of the whales have shown evidence of pre-mortem vessel strike, this finding is not consistent across all whales examined and more research is needed. NOAA is consulting with researchers that are conducting studies on the humpback whale populations, and these efforts may provide information on changes in whale distribution and habitat use that could provide additional insight into how these vessel interactions occurred. More information is available at: https://www.fisheries.noaa.gov/national/marine-life-distress/2016-2023-humpback-whale-unusual-mortality-event-along-atlantic-coast.

Minke Whale

Minke whales can be found in temperate, tropical, and high-latitude waters. The Canadian East Coast stock can be found in the area from the western half of the Davis Strait (45° W longitude) to the Gulf of Mexico (Hayes et al., 2022). This species generally occupies waters less than 100 m deep on the continental shelf. There appears to be a strong seasonal component to minke whale distribution in the Survey Area, in which spring to fall are times of relatively widespread and common occurrence while during winter the species appears to be largely absent (Hayes et al., 2022). Aerial surveys in the New York Bight area found that minke whales were observed throughout the proposed Survey Area with highest numbers sighting in the spring months (Robinson et al., 2021).

Since January 2017, elevated minke whale mortalities have occurred along the Atlantic coast from Maine through South Carolina, with a total of 160 strandings (as of September 26, 2023). This event has been declared a UME; as of 2023, it is pending closure. Full or partial necropsy examinations were conducted on more than 60 percent of the stranded whales. Preliminary findings in several of the whales have shown evidence of human interactions or infectious disease, but these findings are not consistent across all of the whales examined, so more research is needed. More information is available at: https://www.fisheries.noaa.gov/national/marine-life-distress/2017-2023-minke-whale-unusual-mortality-event-along-atlantic-coast.

Sei Whale

The Nova Scotia stock of sei whales can be found in deeper waters of the continental shelf edge waters of the northeastern U.S. and northeastward to south of Newfoundland. Sei whales occur in shallower waters to feed. Currently there is no critical habitat for sei whales, though they can be observed along the shelf edge of the continental shelf. The main threats to this stock are interactions with fisheries and vessel collisions.

Aerial surveys conducted in the New York Bight observed sei whales in both winter and spring, though they preferred deeper waters near the shelf break (Robinson et al., 2021). Passive acoustic data in the proposed Survey Area detected sei whales throughout the year except January and July with highest detections in March and April (Estabrook et al., 2021).

Long-Finned Pilot Whale

Only long-finned pilot whales are expected to occur in this project area due to their more northerly distribution and association with colder water compared to short-finned pilot whales (Garrison and Rosel, 2017). Long-finned pilot whales are found from North Carolina to Iceland, Greenland, and the Barents Sea (Hayes et al., 2022). In U.S. Atlantic waters, the Western North Atlantic stock is distributed principally along the continental shelf edge off the northeastern U.S. coast in winter and early spring. In late spring, pilot whales move onto Georges Bank and into the Gulf of Maine and more northern waters and remain in these areas through late autumn (Hayes et al., 2022).

Atlantic Spotted Dolphin

Atlantic spotted dolphins are found in tropical and warm temperate waters ranging from southern New England, south to the Gulf of Mexico and the Caribbean to Venezuela (Hayes et al., 2020). The Western North Atlantic stock regularly occurs in continental shelf waters south of Cape Hatteras, North Carolina and in continental shelf edge and continental slope waters north of this region (Hayes et al., 2020).

Atlantic White-Sided Dolphin

White-sided dolphins are found in temperate and sub-polar waters of the North Atlantic, primarily in continental shelf waters to the 100-m depth contour from central west Greenland to North Carolina (Hayes et al., 2022). The Gulf of Maine stock is most common in continental shelf waters from Hudson Canyon to Georges Bank and in the Gulf of Maine and lower Bay of Fundy. Sighting data indicate seasonal shifts in distribution (Northridge et al., 1997). During January to May, low numbers of white-sided dolphins are found from Georges Bank to Jeffreys Ledge (off New Hampshire) with even lower numbers south of Georges Bank as documented by a few strandings collected on beaches of Virginia to South Carolina. From June through September, large numbers of white-sided dolphins are found from Georges Bank to the lower Bay of Fundy. From October to December, white-sided dolphins occur at intermediate densities from southern Georges Bank to southern Gulf of Maine (Payne and Heinemann, 1990). Sightings south of Georges Bank, particularly around Hudson Canyon, occur year round but at low densities. Aerial studies confirmed observations in fall and winter in the New York Bight area with preference for deep water at the shelf break throughout the year (Robinson et al., 2021).

Bottlenose Dolphin

There are two distinct bottlenose dolphin morphotypes in the Western North Atlantic: coastal and offshore (Hayes et al., 2020, Hayes et al., 2021). Coastal morphotype dolphins generally reside in waters along the inner continental shelf (within 7.5 km (4.6 mi) of shore), around islands, and are continuously distributed south of Long Island, New York, into the Gulf of Mexico. Coastal dolphins in this area are expected to belong to the Northern Migratory Coastal Stock. Torres et al. (2003) found a statistically significant break in the distribution of the morphotypes at 34 km from shore based upon the genetic analysis of tissue samples collected in nearshore and offshore waters from New York to central Florida. Both morphotypes are likely to occur in the proposed Survey Area. The offshore stock is distributed primarily along the outer continental shelf and continental slope in the Northwest Atlantic Ocean from Georges Bank to the Florida Keys.

Risso's Dolphin

The Western North Atlantic stock of Risso's dolphin occurs from Florida to eastern Newfoundland. They are common on the northwest Atlantic continental shelf in summer and fall with lower abundances in winter and spring. Aerial surveys in the New York Bight area sighted Risso's dolphins throughout the year at the shelf break with highest abundances in spring and summer (Robinson et al., 2021).

Common Dolphin

Common dolphins within the U.S. Atlantic Exclusive Economic Zone (EEZ) belong to the Western North Atlantic stock, generally occurring from Cape Hatteras to the Scotian Shelf (Hayes et al., 2022). Common dolphins are a highly seasonal, migratory species. Within the U.S. Atlantic EEZ, this species is distributed along the continental shelf and typically associated with Gulf Stream features (Cetacean and Turtle Assessment Program, 1982, Hamazaki, 2002, Selzer and Payne, 1988, Hayes et al., 2022). They are commonly found over the continental shelf between the 100-m and 2,000-m isobaths and over prominent underwater topography and east to the mid-Atlantic Ridge (Hayes et al., 2022). Common dolphins occur from Cape Hatteras northeast to Georges Bank (35° N to 42° N latitude) during mid-January to May and move as far north as the Scotian Shelf from mid-summer to fall (Selzer and Payne, 1988). Migration onto the Scotian Shelf and continental shelf off Newfoundland occurs when water temperatures exceed 51.8 °F (11° Celsius; (Sergeant et al., 1970, Gowans and Whitehead, 1995). Breeding usually takes place between June and September (Hayes et al., 2022). Summer surveys included observations of the most individuals followed by fall, winter, and then spring.

Harbor Porpoise

In the project area, only the Gulf of Maine/Bay of Fundy stock of harbor porpoises may be present in the fall and winter. This stock is found in U.S. and Canadian Atlantic waters and is concentrated in the northern Gulf of Maine and southern Bay of Fundy region, generally in waters less than 150 m deep (Hayes et al., 2022). During fall (October–December) and spring (April–June), they are more widely dispersed from New Jersey to Maine with lower densities farther north and south. In winter (January–March), intermediate densities of harbor porpoises can be found in waters off New Jersey to North Carolina with lower densities found in waters off New York to New Brunswick, Canada (Hayes et al., 2022). They are seen from the coastline to deep waters (greater than 1,800 m; (Westgate and Read, 1998), although the majority of the population is found over the continental shelf (Hayes et al., 2022). The main threat to the species is interactions with fisheries, with documented take in the U.S. northeast sink gillnet, mid-Atlantic gillnet, and northeast bottom trawl fisheries and in the Canadian herring weir fisheries (Hayes et al., 2022).

Pinnipeds (Gray Seal and Harbor Seal)

Gray seals have been observed in the proposed Survey Area and these seals belong to the western North Atlantic stock. The range for this stock is thought to be from New Jersey to Labrador Sea. Current population trends show that gray seal abundance is likely increasing in the U.S. Atlantic EEZ (Hayes et al., 2021). Although the rate of increase is unknown, surveys conducted since their arrival in the 1980s indicate a steady increase in abundance in both Maine and Massachusetts (Hayes et al., 2021). It is believed that recolonization by Canadian gray seals is the source of the U.S. population increase (Hayes et al., 2021). Documented haulouts for gray seals exist in the Long Island area, with a possible rookery on Little Gull Island.

Since June 2022, elevated numbers of sick and dead harbor seals and gray seals have been documented along the southern and central coast of Maine. This event has also been declared a UME; as of late 2023, it is pending closure. Preliminary testing of samples found that some harbor and gray seals were positive for the highly pathogenic avian influenza. NMFS and other partners are working on an ongoing investigation of this UME. From June 1, 2022–July 16, 2023, there have been 492 seal strandings. Information on these UMEs are available online at: https://www.fisheries.noaa.gov/2022-2023-pinniped-unusual-mortality-event-along-maine-coast.

Marine Mammal Hearing

Hearing is the most important sensory modality for marine mammals underwater, and exposure to anthropogenic sound can have deleterious effects. To appropriately assess the potential effects of exposure to sound, it is necessary to understand the frequency ranges marine mammals are able to hear. Not all marine mammal species have equal hearing capabilities ( e.g., Richardson et al., 1995, Wartzok and Ketten, 1999, Au and Hastings, 2008). To reflect this, Southall et al. (2007), Southall et al. (2019) recommended that marine mammals be divided into hearing groups based on directly measured (behavioral or auditory evoked potential techniques) or estimated hearing ranges (behavioral response data, anatomical modeling, etc.). Note that no direct measurements of hearing ability have been successfully completed for mysticetes ( i.e., low-frequency cetaceans). Subsequently, NMFS (2018) described generalized hearing ranges for these marine mammal hearing groups. Generalized hearing ranges were chosen based on the approximately 65 dB threshold from the normalized composite audiograms, with the exception for lower limits for low-frequency cetaceans where the lower bound was deemed to be biologically implausible and the lower bound from Southall et al. (2007) retained. Marine mammal hearing groups and their associated hearing ranges are provided in table 4.

The pinniped functional hearing group was modified from Southall et al. (2007) on the basis of data indicating that phocid species have consistently demonstrated an extended frequency range of hearing compared to otariids, especially in the higher frequency range (Hemilä et al., 2006, Kastelein et al., 2009, Reichmuth et al., 2013).

For more detail concerning these groups and associated frequency ranges, please see NMFS (2018) for a review of available information.

Potential Effects of Specified Activities on Marine Mammals and Their Habitat

This section provides a discussion of the ways in which components of the specified activity may impact marine mammals and their habitat. Detailed descriptions of the potential effects of similar specified activities have been provided in other recent Federal Register notices, including for survey activities using the same methodology by Atlantic Shores (87 FR 4200, January 27, 2022; 87 FR 24103, April 22, 2022; 87 FR 38067, June 27, 2022; 87 FR 50293, August 16, 2022). At present, there is no new information on potential effects that would impact our analysis and we incorporate by reference the detailed discussions in those documents rather than repeating the details here.

The Estimated Take section later in this document includes a quantitative analysis of the number of individuals that are expected to be taken by this activity. The Negligible Impact Analysis and Determination section considers the content of this section, the Estimated Take section, and the Proposed Mitigation section, to draw conclusions regarding the likely impacts of these activities on the reproductive success or survivorship of individuals and whether those impacts are reasonably expected to, or reasonably likely to, adversely affect the species or stock through effects on annual rates of recruitment or survival.

Summary on Specific Potential Effects of Acoustic Sound Sources

For general information on sound, its interaction with the marine environment, and a description of acoustic terminology, please see, e.g., (Institute, 1986, Institute, 1995, Au and Hastings, 2008, Hastings and Popper, 2005, Mitson, 1995, Health, 1998, Southall et al., 2007, Urick, 1983). Underwater sound from active acoustic sources can cause one or more of the following: temporary or permanent hearing impairment, behavioral disturbance, masking, stress, and non-auditory physical effects. The degree of effect is intrinsically related to the signal characteristics, received level, distance from the source, and duration of the sound exposure. Marine mammals exposed to high-intensity sound, or to lower-intensity sound for prolonged periods, can experience hearing threshold shift (TS), which is the loss of hearing sensitivity at certain frequency ranges (Finneran, 2015). TS can be permanent (PTS; permanent threshold shift), in which case the loss of hearing sensitivity is not fully recoverable, or temporary (TTS; temporary threshold shift), in which case the animal's hearing threshold would recover over time (Southall et al., 2007).

When PTS occurs, there is physical damage to the sound receptors in the ear ( i.e., tissue damage), whereas TTS represents primarily tissue fatigue and is reversible (Southall et al., 2007). In addition, other investigators have suggested that TTS is within the normal bounds of physiological variability and tolerance and does not represent physical injury ( e.g., Ward, 1997). Therefore, NMFS does not consider TTS to constitute auditory injury.

Animals in the vicinity of Atlantic Shores' proposed HRG survey activities are unlikely to incur even TTS due to the characteristics of the sound source, which include generally very short pulses and potential duration of exposure. These characteristics mean that instantaneous exposure is unlikely to cause TTS because it is unlikely that exposure would occur close enough to the vessel for received levels to exceed peak pressure TTS criteria, and the cumulative duration of exposure would be insufficient to exceed cumulative sound exposure level (SEL) criteria. Even for high-frequency cetacean species ( e.g., harbor porpoises), which have the greatest sensitivity to potential TTS, individuals would have to make a very close approach and remain very close to the vessel operating the source in order to receive multiple exposures at relatively high levels as would be necessary to cause TTS. Intermittent exposures—as would occur due to the brief, transient signals produced by these sources—require a higher cumulative SEL to induce TTS than would continuous exposures of the same duration ( i.e., intermittent exposure results in lower levels of TTS). Moreover, most marine mammals would more likely avoid a loud sound source rather than swim in such close proximity as to result in TTS. Kremser et al. (2005) noted that the probability of a cetacean swimming through the area of exposure when a sub-bottom profiler emits a pulse is small—because if the animal was in the area, it would have to pass the transducer at close range in order to be subjected to sound levels that could cause TTS and would likely exhibit avoidance behavior to the area near the transducer rather than swim through at such a close range.

Behavioral disturbance to marine mammals from sound may include a variety of effects, including subtle changes in behavior ( e.g., minor or brief avoidance of an area or changes in vocalizations), more conspicuous changes in similar behavioral activities, and more sustained and/or potentially severe reactions, such as displacement from or abandonment of high-quality habitat. Behavioral responses to sound are highly variable and context-specific and any reactions depend on numerous intrinsic and extrinsic factors ( e.g., species, state of maturity, experience, current activity, reproductive state, auditory sensitivity, time of day), as well as the interplay between factors. Available studies show wide variation in response to underwater sound; therefore, it is difficult to predict specifically how any given sound in a particular instance might affect marine mammals perceiving the signal.

In addition, sound can disrupt behavior through masking, or interfering with, an animal's ability to detect, recognize, or discriminate between acoustic signals of interest ( e.g., those used for intraspecific communication and social interactions, prey detection, predator avoidance, navigation). Masking occurs when the receipt of a sound is interfered with by another coincident sound at similar frequencies and at similar or higher intensity, and may occur whether the sound is natural ( e.g., snapping shrimp, wind, waves, precipitation) or anthropogenic ( e.g., shipping, sonar, seismic exploration) in origin. Marine mammal communications would not likely be masked appreciably by the acoustic signals given the directionality of the signals for the HRG survey equipment planned for use (table 2) and the brief period for when an individual mammal would likely be exposed.

Sound may affect marine mammals through impacts on the abundance, behavior, or distribution of prey species ( e.g., crustaceans, cephalopods, fish, zooplankton) ( i.e., effects to marine mammal habitat). Prey species exposed to sound might move away from the sound source, experience TTS, experience masking of biologically relevant sounds, or show no obvious direct effects. The most likely impacts, if any, for most prey species in a given area would be temporary avoidance of the area. Surveys using active acoustic sound sources move through an area, limiting exposure to multiple pulses. In all cases, sound levels would return to ambient once a survey ends and the noise source is shut down and, when exposure to sound ends, behavioral and/or physiological responses are expected to end relatively quickly. Finally, the HRG survey equipment will not have significant impacts to the seafloor and does not represent a source of pollution.

Vessel Strike

Vessel collisions with marine mammals, or vessel strikes, can result in death or serious injury of the animal. These interactions are typically associated with large whales, which are less maneuverable than are smaller cetaceans or pinnipeds in relation to large vessels. Vessel strikes generally involve commercial shipping vessels, which are normally larger and of which there is much more traffic in the ocean than geophysical survey vessels. Jensen et al. (2003) summarized vessel strikes of large whales worldwide from 1975–2003 and found that most collisions occurred in the open ocean and involved large vessels ( e.g., commercial shipping). For vessels used in geophysical survey activities, vessel speed while towing gear is typically only 4–5 kn (2.1–2.6 m/s). At these speeds, both the possibility of striking a marine mammal and the possibility of a strike resulting in serious injury or mortality are so low as to be discountable. At average transit speed for geophysical survey vessels, the probability of serious injury or mortality resulting from a strike is less than 50 percent. However, the likelihood of a strike actually happening is again low given the smaller size of these vessels proposed for use and generally slower speeds. Notably in the Jensen and Silber study, no strike incidents were reported for geophysical survey vessels during that time period.

The potential effects of Atlantic Shores' specified survey activity are expected to be limited to Level B behavioral harassment. No permanent or temporary auditory effects or significant impacts to marine mammal habitat, including prey, are expected.

Estimated Take

This section provides an estimate of the number of incidental takes proposed for authorization through the IHA, which will inform both NMFS' consideration of “small numbers,” and the negligible impact determinations.

Harassment is the only type of take expected to result from these activities. Except with respect to certain activities not pertinent here, section 3(18) of the MMPA defines “harassment” as any act of pursuit, torment, or annoyance, which (i) has the potential to injure a marine mammal or marine mammal stock in the wild (Level A harassment); or (ii) has the potential to disturb a marine mammal or marine mammal stock in the wild by causing disruption of behavioral patterns, including, but not limited to, migration, breathing, nursing, breeding, feeding, or sheltering (Level B harassment).

Authorized takes would be by Level B harassment only, in the form of disruption of behavioral patterns for individual marine mammals resulting from exposure to sound produced by the sparker. Based on the characteristics of the signals produced by the acoustic source planned for use ( i.e., sparker), Level A harassment is neither anticipated (even absent mitigation) nor proposed to be authorized. As described previously, no serious injury or mortality is anticipated or proposed to be authorized for this activity. Below, we describe how the proposed take numbers are estimated.

For acoustic impacts, generally speaking, we estimate take by considering: (1) acoustic thresholds above which NMFS believes the best available science indicates marine mammals will be behaviorally harassed or incur some degree of permanent hearing impairment; (2) the area or volume of water that will be ensonified above these levels in a day; (3) the density or occurrence of marine mammals within these ensonified areas; and, (4) the number of days of activities. We note that while these factors can contribute to a basic calculation to provide an initial prediction of potential takes, additional information that can qualitatively inform take estimates is also sometimes available ( e.g., previous monitoring results or average group size). Below, we describe the factors considered here in more detail and present the proposed take estimates.

Acoustic Thresholds

NMFS recommends the use of acoustic thresholds that identify the received level of underwater sound above which exposed marine mammals would be reasonably expected to be behaviorally harassed (equated to Level B harassment) or to incur PTS of some degree (equated to Level A harassment).

Level B Harassment —Though significantly driven by received level, the onset of behavioral disturbance from anthropogenic noise exposure is also informed to varying degrees by other factors related to the source or exposure context ( e.g., frequency, predictability, duty cycle, duration of the exposure, signal-to-noise ratio, distance to the source), the environment ( e.g., bathymetry, other noises in the area, predators in the area), and the receiving animals (hearing, motivation, experience, demography, life stage, depth) and can be difficult to predict ( e.g., Southall et al., 2007, Southall et al., 2021, Ellison et al., 2012). Based on what the available science indicates and the practical need to use a threshold based on a metric that is both predictable and measurable for most activities, NMFS typically uses a generalized acoustic threshold based on received level to estimate the onset of behavioral harassment. NMFS generally predicts that marine mammals are likely to be behaviorally harassed in a manner considered to be Level B harassment when exposed to underwater anthropogenic noise above RMS pressure received levels (RMS SPL) of 120 dB (referenced to 1 microPascal (re 1 μPa)) for continuous ( e.g., vibratory pile driving, drilling) and above RMS SPL 160 dB re 1 μPa for non-explosive impulsive ( e.g., seismic airguns) or intermittent ( e.g., scientific sonar) sources.

Generally speaking, Level B harassment take estimates based on these behavioral harassment thresholds are expected to include any likely takes by TTS as, in most cases, the likelihood of TTS occurs at distances from the source less than those at which behavioral harassment is likely. TTS of a sufficient degree can manifest as behavioral harassment, as reduced hearing sensitivity and the potential reduced opportunities to detect important signals ( e.g., conspecific communication, predators, prey) may result in changes in behavior patterns that would not otherwise occur.

Atlantic Shores' marine site characterization surveys include the use of an impulsive ( i.e., sparker) source, and therefore the SPL threshold of 160 dB re 1 μPa is applicable.

Level A Harassment —NMFS' Technical Guidance for Assessing the Effects of Anthropogenic Sound on Marine Mammal Hearing (Version 2.0; (NMFS, 2018)) identifies dual criteria to assess auditory injury (Level A harassment) to five different marine mammal groups (based on hearing sensitivity) as a result of exposure to noise from two different types of sources (impulsive or non-impulsive).

The references, analysis, and methodology used in the development of the thresholds are described in NMFS' 2018 Technical Guidance, which may be accessed at: https://www.fisheries.noaa.gov/national/marine-mammal-protection/marine-mammal-acoustic-technical-guidance.

Ensonified Area

Here, we describe operational and environmental parameters of the activity that are used in estimating the area ensonified above the acoustic thresholds, including source levels and transmission loss coefficient.

NMFS has developed a user-friendly methodology for estimating the extent of the Level B harassment isopleths associated with relevant HRG survey equipment (NMFS, 2020). This methodology incorporates frequency and directionality (when relevant) to refine estimated ensonified zones. For acoustic sources that operate with different beamwidths, the maximum beamwidth was used, and the lowest frequency of the source was used when calculating the frequency-dependent absorption coefficient (table 2). Atlantic Shores used 180° beamwidth in the calculation for the proposed sparker system as is appropriate for an omnidirectional source.

NMFS considers the data provided by Crocker and Fratantonio (2016) to represent the best available information on source levels associated with HRG survey equipment and, therefore, recommends that source levels provided by Crocker and Fratantonio (2016) be incorporated in the method described above to estimate isopleth distances to harassment thresholds. In cases where the source level for a specific type of HRG equipment is not provided in Crocker and Fratantonio (2016), NMFS recommends that, in instances where data from a suitable proxy is presented, Crocker and Fratantonio (2016) be used, or, alternatively, when no suitable proxy is available, source levels provided by the manufacturer may be used instead. Table 2 shows the HRG equipment type used during the proposed surveys and the source levels associated with the HRG equipment type.

Atlantic Shores proposes to use the GeoMarine Geo-Source 400 Marine Multi-tip Sparker System (400 tip/400 J). No data are provided by Crocker and Fratantonio (2016) for the GeoMarine Geo-Source sparker system, therefore, Atlantic Shores proposes to use the data provided for the SIG ELC 820 operating at 400 J with 100 electrode tips as a proxy for the GeoMarine Geo-Source operating at 400 J with 400 electrode tips. Crocker and Fratantonio (2016) indicates an operational source level of 195 dB_RMS for the SIG ELC 820 while operating at a power of 400 J using 100 electrode tips, and Atlantic Shores has determined that an increase in the number of electrode tips decreases the overall peak source pressure translating to a lower operational source level. NMFS concurs with this selection, which is described in table 2. Using the proxy source level of 195 dB RMS SPL results in an estimated distance of 56 m to the Level B harassment isopleth.

Marine Mammal Occurrence

In this section, we provide information about the occurrence of marine mammals, including density or other relevant information which will inform the take calculations.

Habitat-based density models produced by the Duke University Marine Geospatial Ecology Laboratory (Roberts et al., 2023) represent the best available information regarding marine mammal densities in the proposed Survey Area. These density data incorporate aerial and shipboard line-transect survey data from NMFS and other organizations and incorporate data from numerous physiographic and dynamic oceanographic and biological covariates, and controls for the influence of sea state, group size, availability bias, and perception bias on the probability of making a sighting. These density models were originally developed for all cetacean taxa in the U.S. Atlantic in 2016 and models for all taxa were updated in 2022 (Roberts et al., 2023). More information is available online at: https://seamap.env.duke.edu/models/Duke/EC/. Marine mammal density estimates in the proposed Survey Area (animals/km² ) were obtained using the most recent model results for all taxa.

For the exposure analysis, density data from Roberts et al. (2023) were mapped using a geographic information system (GIS). For the proposed Survey Area, the monthly densities of each species as reported by Roberts et al. (2023) were averaged by season; thus, a density was calculated for each species for spring, summer, fall, and winter. Density seasonal averages were calculated for both the nearshore and offshore areas ( i.e., inside and outside the 10-m isobath) for each species to assess the greatest average seasonal densities for each species. To be conservative since the exact timing for the survey during the year is uncertain, the greatest average seasonal density calculated for each species was carried forward in the exposure analysis, with exceptions noted later in this discussion. Estimated greatest average seasonal densities (animals/km² ) of marine mammal species that may be taken incidental to the proposed survey can be found in tables C–1 and C–2 of Atlantic Shores' IHA application. Below, we discuss how densities were assumed to apply to specific species for which the Roberts et al. (2023) models provide results at the genus or guild level.

There are two stocks of bottlenose dolphins that may be impacted by the surveys (Western North Atlantic Northern Migratory Coastal Stock (coastal stock) and Western North Atlantic Offshore Stock (offshore stock)), however, Roberts et al. (2023) do not differentiate by stock. These two stocks are considered geographically separated and multiple isobaths, including the 20-m (Hayes et al. 2021) and 25-m (Hayes et al. 2020), have been considered as the delineation between the two. Atlantic Shores used the 25-m isobath in their calculation and NMFS has accepted this interpretation. The nearshore area of the proposed Survey Area is considered waters less than 10 m depth and only the coastal stock would occur and potentially be taken by survey effort in that area. Both stocks could occur in the offshore area (greater than 10 m depth), so Atlantic Shores calculated separate mean seasonal densities to use for estimating take of the coastal and offshore stocks of bottlenose dolphins, respectively.

In addition, the Roberts et al. (2023) density model does not differentiate between the different pinniped species. For seals, given their size and behavior when in the water, seasonality, and feeding preferences, there is limited information available on species-specific distribution. Density estimates from Roberts et al. (2023) include all seal species that may occur in the Western North Atlantic combined ( i.e., gray, harbor, harp, hooded). For this IHA, only gray seals and harbor seals are reasonably expected to occur in the proposed Survey Area; densities of seals were split evenly between these two species.

Finally, the Roberts et al. (2023) density model does not differentiate between pilot whale species. While the exact latitudinal ranges of the two species are uncertain, only long-finned pilot whales are expected to occur in this project area due to their more northerly distribution and tolerance of shallower, colder shelf waters (Hayes et al., 2022). Short-finned pilot whales are not anticipated to occur as far north as the Survey Area so we assume that all pilot whales near the project area would be long-finned pilot whales (Garrison and Rosel, 2017). For this IHA, densities of pilot whales are assumed to be only long-finned pilot whale.

Take Estimation

Here, we describe how the information provided above is synthesized to produce a quantitative estimate of the take that is reasonably likely to occur and proposed for authorization.

In order to estimate the number of marine mammals predicted to be exposed to sound levels that would result in harassment, radial distances to predicted isopleths corresponding to Level B harassment thresholds were calculated, as described above. The distance ( i.e., 56 m distance associated with the sparker system) to the Level B harassment criterion and the total length of the survey trackline were then used to calculate the total ensonified area, or harassment zone, around the survey vessel. Atlantic Shores proposes to conduct HRG surveys for a maximum total of 28,800 km trackline length, of which 25,200 km are in the offshore area and 3,600 km are in the nearshore area. Based on the maximum estimated distance to the Level B harassment threshold (56 m) for the sparker system and maximum total survey length, the total ensonified area is 3,228 km² (2,824 km² offshore area and 404 km² nearshore area), based on the following formula, where the total estimated trackline length ( Distance/day) in each area was used and buffered with the horizontal distance to the Level B harassment threshold ( r) to determine the total area ensonified to 160 dB SPL.

Harassment Zone = (Distance/day × 2 r) + π r ²

The number of marine mammals expected to be incidentally taken during the total survey is then calculated by estimating the number of each species predicted to occur within the ensonified area (animals/km² ), incorporating the greatest seasonal estimated marine mammal densities as described above. The product is then rounded to generate an estimate of the total number of instances of harassment expected for each species over the duration of the survey (up to 300 days). A summary of this method is illustrated in the following formula, where the Harassment Zone is multiplied by the highest seasonal mean density ( D ) of each species or stock (animals/km² ; except for pilot whales where annual density was used based on data availability).

Estimated Take = Harassment Zone × D × number of days

The resulting take of marine mammals (Level B harassment) is shown in table 5.

Proposed Mitigation

In order to issue an IHA under section 101(a)(5)(D) of the MMPA, NMFS must set forth the permissible methods of taking pursuant to the activity, and other means of effecting the least practicable impact on the species or stock and its habitat, paying particular attention to rookeries, mating grounds, and areas of similar significance, and on the availability of the species or stock for taking for certain subsistence uses (latter not applicable for this action). NMFS regulations require applicants for incidental take authorizations to include information about the availability and feasibility (economic and technological) of equipment, methods, and manner of conducting the activity or other means of effecting the least practicable adverse impact upon the affected species or stocks, and their habitat (50 CFR 216.104(a)(11)).

In evaluating how mitigation may or may not be appropriate to ensure the least practicable adverse impact on species or stocks and their habitat, NMFS considers two primary factors:

(1) The manner in which, and the degree to which, the successful implementation of the measure(s) is expected to reduce impacts to marine mammals, marine mammal species or stocks, and their habitat. This considers the nature of the potential adverse impact being mitigated (likelihood, scope, range). It further considers the likelihood that the measure will be effective if implemented (probability of accomplishing the mitigating result if implemented as planned), the likelihood of effective implementation (probability implemented as planned), and;

(2) The practicability of the measures for applicant implementation, which may consider such things as cost, and impact on operations.

Pursuant to section 7 of the ESA, Atlantic Shores is also required to adhere to relevant Project Design Criteria (PDC) of the NMFS' Greater Atlantic Regional Fisheries Office (GARFO) programmatic consultation (specifically PDCs 4, 5, and 7) regarding geophysical surveys along the U.S. Atlantic coast ( https://www.fisheries.noaa.gov/new-england-mid-atlantic/consultations/section-7-take-reporting-programmatics-greater-atlantic#offshore-wind-site-assessment-and-site-characterization-activities-programmatic-consultation ).

NMFS proposes the following mitigation measures be implemented during Atlantic Shores' proposed marine site characterization surveys.

Visual Monitoring and Shutdown Zones

Atlantic Shores must employ independent, dedicated, trained protected species observers (PSOs), meaning that the PSOs must (1) be employed by a third-party observer provider, (2) have no tasks other than to conduct observational effort, collect data, and communicate with and instruct relevant vessel crew with regard to the presence of marine mammals and mitigation requirements (including brief alerts regarding maritime hazards), and (3) have successfully completed an approved PSO training course appropriate for geophysical surveys. Visual monitoring must be performed by qualified, NMFS-approved PSOs. PSO resumes must be provided to NMFS for review and approval prior to the start of survey activities.

During survey operations ( e.g., any day in which use of the sparker system is planned to occur, and whenever the sparker system is in the water, whether activated or not), a minimum of one visual marine mammal observer (PSO) must be on duty on each source vessel and conducting visual observations at all times during daylight hours ( i.e., from 30 minutes (min) prior to sunrise through 30 min following sunset). A minimum of two PSOs must be on duty on each source vessel during nighttime hours. Visual monitoring must begin no less than 30 min prior to ramp-up (described below) and must continue until 30 min after use of the sparker system ceases.

Visual PSOs shall coordinate to ensure 360° visual coverage around the vessel from the most appropriate observation posts and shall conduct visual observations using binoculars and the naked eye while free from distractions and in a consistent, systematic, and diligent manner. PSOs shall establish and monitor applicable pre-start clearance and shutdown zones (see below). These zones shall be based upon the radial distance from the sparker system (rather than being based around the vessel itself).

Two pre-start clearance and shutdown zones are defined, depending on the species and context. Here, an extended pre-start clearance and shutdown zone encompassing the area at and below the sea surface out to a radius of 500 m from the sparker system (0–500 m) is defined for NARW. For all other marine mammals, the pre-start clearance and shutdown zone encompasses a standard distance of 100 m (0–100 m) during the use of the sparker. Any observations of marine mammals by crew members aboard any vessel associated with the survey shall be relayed to the PSO team.

Visual PSOs may be on watch for a maximum of 4 consecutive hours followed by a break of at least 1 hr between watches and may conduct a maximum of 12 hr of observation per 24-hr period.

Pre-Start Clearance and Ramp-Up Procedures

A ramp-up procedure, involving a gradual increase in source level output, is required at all times as part of the activation of the sparker system when technically feasible. If technically feasible, operators must ramp up sparker to half power for 5 min and then proceed to full power. A 30 min pre-start clearance observation period of the pre-start clearance zones must occur prior to the start of ramp-up. The intent of the pre-start clearance observation period (30 min) is to ensure no marine mammals are within the pre-start clearance zones prior to the beginning of ramp-up. The intent of the ramp-up is to warn marine mammals of pending operations and to allow sufficient time for those animals to leave the immediate vicinity. All operators must adhere to the following pre-start clearance and ramp-up requirements:

• The operator must notify a designated PSO of the planned start of ramp-up as agreed upon with the lead PSO; the notification time should not be less than 60 min prior to the planned ramp-up in order to allow the PSOs time to monitor the pre-start clearance zones for 30 min prior to the initiation of ramp-up (pre-start clearance). During this 30 min pre-start clearance period the entire pre-start clearance zone must be visible, except as indicated below.
• Ramp-ups shall be scheduled so as to minimize the time spent with the sparker activated.
• A visual PSO conducting pre-start clearance observations must be notified again immediately prior to initiating ramp-up procedures and the operator must receive confirmation from the PSO to proceed.
• Any PSO on duty has the authority to delay the start of survey operations if a marine mammal is detected within the applicable pre-start clearance zone.
• The operator must establish and maintain clear lines of communication directly between PSOs on duty and crew controlling the acoustic source to ensure that mitigation commands are conveyed swiftly while allowing PSOs to maintain watch.

If there is uncertainty regarding identification of a marine mammal species, PSOs may use best professional judgment in making the decision to call for a shutdown.

• Ramp-up may not be initiated if any marine mammal to which the pre-start clearance requirement applies is within the pre-start clearance zone. If a marine mammal is observed within the pre-start clearance zone during the 30 min pre-start clearance period, ramp-up may not begin until the animal(s) has been observed exiting the zones or until an additional time period has elapsed with no further sightings.
• PSOs must monitor the pre-start clearance zones 30 min before and during ramp-up, and ramp-up must cease and the sparker must be shut down upon observation of a marine mammal within the applicable pre-start clearance zone.
• Ramp-up may occur at times of poor visibility, including nighttime, if appropriate visual monitoring has occurred with no detections of marine mammals in the 30 min prior to beginning ramp-up. Sparker activation may only occur at night where operational planning cannot reasonably avoid such circumstances.

If the sparker is shut down for brief periods ( i.e., less than 30 min) for reasons other than implementation of prescribed mitigation ( e.g., mechanical difficulty), it may be activated again without ramp-up if PSOs have maintained constant visual observation and no detections of marine mammals have occurred within the applicable pre-start clearance zone. For any longer shutdown, pre-start clearance observation and ramp-up are required.

Shutdown Procedures

All operators must adhere to the following shutdown requirements:

• Any PSO on duty has the authority to call for shutdown of the sparker system if a marine mammal is detected within the applicable shutdown zones.
• The operator must establish and maintain clear lines of communication directly between PSOs on duty and crew controlling the source to ensure that shutdown commands are conveyed swiftly while allowing PSOs to maintain watch.
• When the sparker system is active and a marine mammal appears within or enters the applicable shutdown zones, the sparker must be shut down. When shutdown is instructed by a PSO, the sparker system must be immediately deactivated and any dispute resolved only following deactivation.
• Two shutdown zones are defined, depending on the species and context. An extended shutdown zone encompassing the area at and below the sea surface out to a radius of 500 m from the sparker system (0–500 m) is defined for NARW. For all other marine mammals, the shutdown zone encompasses a standard distance of 100 m (0–100 m) during the use of the sparker.

The shutdown requirement is waived for small delphinids and pinnipeds. If a small delphinid (individual belonging to the following genera of the Family Delphinidae: Delphinus, Lagenorhynchus, Stenella, and Tursiops) or pinniped is visually detected within the shutdown zones, no shutdown is required unless the PSO confirms the individual to be of a genus other than those listed, in which case a shutdown is required.

If there is uncertainty regarding identification of a marine mammal species ( i.e., whether the observed marine mammal(s) belongs to one of the delphinid genera for which shutdown is waived or one of the species with a larger shutdown zone), PSOs may use best professional judgment in making the decision to call for a shutdown.

Upon implementation of shutdown, the sparker may be reactivated after the marine mammal has been observed exiting the applicable shutdown zone or following a clearance period (30 min for all baleen whale species, long-finned pilot whales, and Risso's dolphins; 15 min for harbor porpoises) with no further detection of the marine mammal.

If a species for which authorization has not been granted, or a species for which authorization has been granted but the authorized number of takes have been met, approaches or is observed within the Level B harassment zone (56 m), shutdown must occur.

Vessel Strike Avoidance

Crew and supply vessel personnel must use an appropriate reference guide that includes identifying information on all marine mammals that may be encountered. Vessel operators must comply with the below measures except under extraordinary circumstances when the safety of the vessel or crew is in doubt or the safety of life at sea is in question. These requirements do not apply in any case where compliance would create an imminent and serious threat to a person or vessel or to the extent that a vessel is restricted in its ability to maneuver and, because of the restriction, cannot comply.

Vessel operators and crews must maintain a vigilant watch for all marine mammals and slow down, stop their vessel(s), or alter course, as appropriate and regardless of vessel size, to avoid striking any marine mammals. A single marine mammal at the surface may indicate the presence of submerged animals in the vicinity of the vessel; therefore, precautionary measures should always be exercised. A visual observer aboard the vessel must monitor a vessel strike avoidance zone around the vessel (species-specific distances are detailed below). Visual observers monitoring the vessel strike avoidance zone may be third-party observers ( i.e., PSOs) or crew members, but crew members responsible for these duties must be provided sufficient training to (1) distinguish marine mammal from other phenomena, and (2) broadly to identify a marine mammal as a NARW, other whale (defined in this context as baleen whales other than NARWs), or other marine mammals.

All survey vessels, regardless of size, must observe a 10-kn (18.52 km/hr) speed restriction in specific areas designated by NMFS for the protection of NARWs from vessel strikes. These include all SMAs established under 50 CFR 224.105 (when in effect), any dynamic management areas (DMA) (when in effect), and Slow Zones. See https://www.fisheries.noaa.gov/national/endangered-species-conservation/reducing-ship-strikes-north-atlantic-right-whales for specific detail regarding these areas.

• All vessels must reduce speed to 10 kn or less when mother/calf pairs, pods, or large assemblages of cetaceans are observed near a vessel.
• All vessels must maintain a minimum separation distance of 500 m from NARWs, other ESA-listed species, and any unidentified large whales. If a NARW, other ESA-listed species, and any unidentified large whale is sighted within the relevant separation distance, the vessel must steer a course away at 10 kn or less until the 500-m separation distance has been established. If a whale is observed but cannot be confirmed as a species other than a NARW, the vessel operator must assume that it is a NARW and take appropriate action.
• All vessels must maintain a minimum separation distance of 100 m from all non-ESA-listed baleen whales.

• All vessels must, to the maximum extent practicable, attempt to maintain a minimum separation distance of 50 m from all other marine mammals, with an understanding that at times this may not be possible ( e.g., for animals that approach the vessel).

• When marine mammals are sighted while a vessel is underway, the vessel must take action as necessary to avoid violating the relevant separation distance ( e.g., attempt to remain parallel to the animal's course, avoid excessive speed or abrupt changes in direction until the animal has left the area, reduce speed and shift the engine to neutral). This does not apply to any vessel towing gear or any vessel that is navigationally constrained.

Atlantic Shores and members of the PSO team will consult the NMFS NARW reporting system and Whale Alert, daily and as able, for the presence of NARWs throughout survey operations, and for the establishment of DMAs and/or Slow Zones. It is Atlantic Shores' responsibility to maintain awareness of the establishment and location of any such areas and to abide by these requirements accordingly.

Seasonal Operating Requirements

As described above, a section of the proposed Survey Area partially overlaps with portions of two NARW SMAs off the ports of New York/New Jersey and the entrance to Delaware Bay. These SMAs are active from November 1 through April 30 of each year. The survey vessels, regardless of length, would be required to adhere to vessel speed restrictions (less than 10 kn) when operating within the SMAs during times when the SMAs are active (table 6).

Based on our evaluation of the applicant's proposed measures, NMFS has preliminarily determined that the proposed mitigation measures provide the means of effecting the least practicable impact on the affected species or stocks and their habitat, paying particular attention to rookeries, mating grounds, and areas of similar significance.

Proposed Monitoring and Reporting

In order to issue an IHA for an activity, section 101(a)(5)(D) of the MMPA states that NMFS must set forth requirements pertaining to the monitoring and reporting of such taking. The MMPA implementing regulations at 50 CFR 216.104(a)(13) indicate that requests for authorizations must include the suggested means of accomplishing the necessary monitoring and reporting that will result in increased knowledge of the species and of the level of taking or impacts on populations of marine mammals that are expected to be present while conducting the activities. Effective reporting is critical both to compliance as well as ensuring that the most value is obtained from the required monitoring.

Monitoring and reporting requirements prescribed by NMFS should contribute to improved understanding of one or more of the following:

• Occurrence of marine mammal species or stocks in the area in which take is anticipated ( e.g., presence, abundance, distribution, density);

• Nature, scope, or context of likely marine mammal exposure to potential stressors/impacts (individual or cumulative, acute or chronic), through better understanding of: (1) action or environment ( e.g., source characterization, propagation, ambient noise); (2) affected species ( e.g., life history, dive patterns); (3) co-occurrence of marine mammal species with the activity; or (4) biological or behavioral context of exposure ( e.g., age, calving or feeding areas);

• Individual marine mammal responses (behavioral or physiological) to acoustic stressors (acute, chronic, or cumulative), other stressors, or cumulative impacts from multiple stressors;
• How anticipated responses to stressors impact either: (1) long-term fitness and survival of individual marine mammals; or (2) populations, species, or stocks;

• Effects on marine mammal habitat ( e.g., marine mammal prey species, acoustic habitat, or other important physical components of marine mammal habitat); and

• Mitigation and monitoring effectiveness.

Proposed Monitoring Measures

Visual monitoring must be performed by qualified, NMFS-approved PSOs. Atlantic Shores must submit PSO resumes for NMFS review and approval prior to commencement of the survey. Resumes should include dates of training and any prior NMFS approval, as well as dates and description of last experience, and must be accompanied by information documenting successful completion of an acceptable training course.

For prospective PSOs not previously approved, or for PSOs whose approval is not current, NMFS must review and approve PSO qualifications. Resumes should include information related to relevant education, experience, and training, including dates, duration, location, and description of prior PSO experience. Resumes must be accompanied by relevant documentation of successful completion of necessary training.

NMFS may approve PSOs as conditional or unconditional. A conditionally-approved PSO may be one who is trained but has not yet attained the requisite experience. An unconditionally-approved PSO is one who has attained the necessary experience. For unconditional approval, the PSO must have a minimum of 90 days at sea performing the role during a geophysical survey, with the conclusion of the most recent relevant experience not more than 18 months previous.

At least one of the visual PSOs aboard the vessel must be unconditionally-approved. One unconditionally-approved visual PSO shall be designated as the lead for the entire PSO team. This lead should typically be the PSO with the most experience, who would coordinate duty schedules and roles for the PSO team and serve as primary point of contact for the vessel operator. To the maximum extent practicable, the duty schedule shall be planned such that unconditionally-approved PSOs are on duty with conditionally-approved PSOs.

At least one PSO aboard each acoustic source vessel must have a minimum of 90 days at-sea experience working in the role, with no more than 18 months elapsed since the conclusion of the at-sea experience. One PSO with such experience must be designated as the lead for the entire PSO team and serve as the primary point of contact for the vessel operator. (Note that the responsibility of coordinating duty schedules and roles may instead be assigned to a shore-based, third-party monitoring coordinator.) To the maximum extent practicable, the lead PSO must devise the duty schedule such that experienced PSOs are on duty with those PSOs with appropriate training but who have not yet gained relevant experience.

PSOs must successfully complete relevant training, including completion of all required coursework and passing (80 percent or more) a written and/or oral examination developed for the training program.

PSOs must have successfully attained a bachelor's degree from an accredited college or university with a major in one of the natural sciences, a minimum of 30 semester hours or equivalent in the biological sciences, and at least one undergraduate course in math or statistics. The educational requirements may be waived if the PSO has acquired the relevant skills through alternate experience. Requests for such a waiver shall be submitted to NMFS and must include written justification. Alternate experience that may be considered includes, but is not limited to (1) secondary education and/or experience comparable to PSO duties; (2) previous work experience conducting academic, commercial, or government-sponsored marine mammal surveys; and (3) previous work experience as a PSO (PSO must be in good standing and demonstrate good performance of PSO duties).

Atlantic Shores must work with the selected third-party PSO provider to ensure PSOs have all equipment (including backup equipment) needed to adequately perform necessary tasks, including accurate determination of distance and bearing to observed marine mammals, and to ensure that PSOs are capable of calibrating equipment as necessary for accurate distance estimates and species identification. Such equipment, at a minimum, shall include:

• At least one thermal (infrared) imaging device suited for the marine environment;

• Reticle binoculars ( e.g., 7 × 50) of appropriate quality (at least one per PSO, plus backups);

• Global positioning units (GPS) (at least one plus backups);
• Digital cameras with a telephoto lens that is at least 300-mm or equivalent on a full-frame single lens reflex (SLR) (at least one plus backups). The camera or lens should also have an image stabilization system;
• Equipment necessary for accurate measurement of distances to marine mammal;
• Compasses (at least one plus backups);
• Means of communication among vessel crew and PSOs; and,
• Any other tools deemed necessary to adequately and effectively perform PSO tasks.

The equipment specified above may be provided by an individual PSO, the third-party PSO provider, or the operator, but Atlantic Shores is responsible for ensuring PSOs have the proper equipment required to perform the duties specified in the IHA. Reference materials must be available aboard all project vessels for identification of protected species.

The PSOs will be responsible for monitoring the waters surrounding the survey vessel to the farthest extent permitted by sighting conditions, including pre-start clearance and shutdown zones, during all HRG survey operations. PSOs will visually monitor and identify marine mammals, including those approaching or entering the established pre-start clearance and shutdown zones during survey activities. It will be the responsibility of the PSO(s) on duty to communicate the presence of marine mammals as well as to communicate the action(s) that are necessary to ensure mitigation and monitoring requirements are implemented as appropriate.

PSOs must be equipped with binoculars and have the ability to estimate distance and bearing to detect marine mammals, particularly in proximity to shutdown zones. Reticulated binoculars must also be available to PSOs for use as appropriate based on conditions and visibility to support the sighting and monitoring of marine mammals. During nighttime operations, appropriate night-vision devices ( e.g., night-vision goggles with thermal clip-ons and infrared technology) would be used. Position data would be recorded using hand-held or vessel GPS units for each sighting.

During good conditions ( e.g., daylight hours; Beaufort sea state (BSS) 3 or less), to the maximum extent practicable, PSOs must also conduct observations when the acoustic source is not operating for comparison of sighting rates and behavior with and without use of the active acoustic sources and between acquisition periods. Any observations of marine mammals by crew members aboard the vessel associated with the survey would be relayed to the PSO team.

Data on all PSO observations would be recorded based on standard PSO collection requirements (see Proposed Reporting Measures). This would include dates, times, and locations of survey operations; dates and times of observations, location and weather; details of marine mammal sightings ( e.g., species, numbers, behavior); and details of any observed marine mammal behavior that occurs ( e.g., noted behavioral disturbances). Members of the PSO team shall consult the NMFS NARW reporting system and Whale Alert, daily and as able, for the presence of NARWs throughout survey operations.

Proposed Reporting Measures

Atlantic Shores shall submit a draft comprehensive report to NMFS on all activities and monitoring results within 90 days of the completion of the survey or expiration of the IHA, whichever comes sooner. The report must describe all activities conducted and sightings of marine mammals, must provide full documentation of methods, results, and interpretation pertaining to all monitoring, and must summarize the dates and locations of survey operations and all marine mammals sightings (dates, times, locations, activities, associated survey activities). The draft report shall also include geo-referenced, time-stamped vessel tracklines for all time periods during which acoustic sources were operating. Tracklines should include points recording any change in acoustic source status ( e.g., when the sources began operating, when they were turned off, or when they changed operational status such as from full array to single gun or vice versa). GIS files shall be provided in Environmental Systems Research Institute, Inc. (ESRI) shapefile format and include the Coordinated Universal Time (UTC) date and time, latitude in decimal degrees, and longitude in decimal degrees. All coordinates shall be referenced to the WGS84 geographic coordinate system. In addition to the report, all raw observational data shall be made available. The report must summarize the information. A final report must be submitted within 30 days following resolution of any comments on the draft report. All draft and final marine mammal monitoring reports must be submitted to PR.ITP.MonitoringReports@noaa.gov, nmfs.gar.incidental-take@noaa.gov, and ITP.clevenstine@noaa.gov.

PSOs must use standardized electronic data forms to record data. PSOs shall record detailed information about any implementation of mitigation requirements, including the distance of marine mammal to the acoustic source and description of specific actions that ensued, the behavior of the animal(s), any observed changes in behavior before and after implementation of mitigation, and if shutdown was implemented, the length of time before any subsequent ramp-up of the acoustic source. If required mitigation was not implemented, PSOs should record a description of the circumstances. At a minimum, the following information must be recorded:

1. Vessel names (source vessel), vessel size and type, maximum speed capability of vessel;

2. Dates of departures and returns to port with port name;

3. PSO names and affiliations;

4. Date and participants of PSO briefings;

5. Visual monitoring equipment used;

6. PSO location on vessel and height of observation location above water surface;

7. Dates and times (Greenwich Mean Time) of survey on/off effort and times corresponding with PSO on/off effort;

8. Vessel location (decimal degrees) when survey effort begins and ends and vessel location at beginning and end of visual PSO duty shifts;

9. Vessel location at 30-second intervals if obtainable from data collection software, otherwise at practical regular interval;

10. Vessel heading and speed at beginning and end of visual PSO duty shifts and upon any change;

11. Water depth (if obtainable from data collection software);

12. Environmental conditions while on visual survey (at beginning and end of PSO shift and whenever conditions change significantly), including BSS and any other relevant weather conditions including cloud cover, fog, sun glare, and overall visibility to the horizon;

13. Factors that may contribute to impaired observations during each PSO shift change or as needed as environmental conditions change ( e.g., vessel traffic, equipment malfunctions); and,

14. Survey activity information (and changes thereof), such as acoustic source power output while in operation, number and volume of airguns operating in an array, tow depth of an acoustic source, and any other notes of significance ( i.e., pre-start clearance, ramp-up, shutdown, testing, shooting, ramp-up completion, end of operations, streamers, etc.).

15. Upon visual observation of any marine mammal, the following information must be recorded:

a. Watch status (sighting made by PSO on/off effort, opportunistic, crew, alternate vessel/platform);

b. Vessel/survey activity at time of sighting ( e.g., deploying, recovering, testing, shooting, data acquisition, other);

c. PSO who sighted the animal;

d. Time of sighting;

e. Initial detection method;

f. Sightings cue;

g. Vessel location at time of sighting (decimal degrees);

h. Direction of vessel's travel (compass direction);

i. Speed of the vessel(s) from which the observation was made;

j. Identification of the animal ( e.g., genus/species, lowest possible taxonomic level or unidentified); also note the composition of the group if there is a mix of species;

k. Species reliability (an indicator of confidence in identification);

l. Estimated distance to the animal and method of estimating distance;

m. Estimated number of animals (high/low/best);

n. Estimated number of animals by cohort (adults, yearlings, juveniles, calves, group composition, etc.);

o. Description (as many distinguishing features as possible of each individual seen, including length, shape, color, pattern, scars, or markings, shape and size of dorsal fin, shape of head, and blow characteristics);

p. Detailed behavior observations ( e.g., number of blows/breaths, number of surfaces, breaching, spyhopping, diving, feeding, traveling; as explicit and detailed as possible; note any observed changes in behavior before and after point of closest approach);

q. Mitigation actions; description of any actions implemented in response to the sighting ( e.g., delays, shutdowns, ramp-up, speed or course alteration, etc.) and time and location of the action;

r. Equipment operating during sighting;

s. Animal's closest point of approach and/or closest distance from the center point of the acoustic source; and,

t. Description of any actions implemented in response to the sighting ( e.g., delays, shutdown, ramp-up) and time and location of the action.

If a NARW is observed at any time by PSOs or personnel on the project vessel, during surveys or during vessel transit, Atlantic Shores must report the sighting information to the NMFS NARW Sighting Advisory System (866–755–6622) within 2 hr of occurrence, when practicable, or no later than 24 hr after occurrence. NARW sightings in any location may also be reported to the U.S. Coast Guard via channel 16 and through the Whale Alert app ( https://www.whalealert.org ).

In the event that personnel involved in the survey activities discover an injured or dead marine mammal, the incident must be reported to NMFS as soon as feasible by phone (866–755–6622) and by email ( nmfs.gar.incidental-take@noaa.gov and PR.ITP.MonitoringReports@noaa.gov). The report must include the following information:

1. Time, date, and location (latitude/longitude) of the first discovery (and updated location information if known and applicable);

2. Species identification (if known) or description of the animal(s) involved;

3. Condition of the animal(s) (including carcass condition if the animal is dead);

4. Observed behaviors of the animal(s), if alive;

5. If available, photographs or video footage of the animal(s); and

6. General circumstances under which the animal was discovered.

In the event of a vessel strike of a marine mammal by any vessel involved in the activities, Atlantic Shores must report the incident to NMFS by phone (866–755–6622) and by email ( nmfs.gar.incidental-take@noaa.gov and PR.ITP.MonitoringReports@noaa.gov) as soon as feasible. The report would include the following information:

1. Time, date, and location (latitude/longitude) of the incident;

2. Species identification (if known) or description of the animal(s) involved;

3. Vessel's speed during and leading up to the incident;

4. Vessel's course/heading and what operations were being conducted (if applicable);

5. Status of all sound sources in use;

6. Description of avoidance measures/requirements that were in place at the time of the strike and what additional measures were taken, if any, to avoid strike;

7. Environmental conditions ( e.g., wind speed and direction, Beaufort sea state, cloud cover, visibility) immediately preceding the strike;

8. Estimated size and length of animal that was struck;

9. Description of the behavior of the marine mammal immediately preceding and/or following the strike;

10. If available, description of the presence and behavior of any other marine mammals immediately preceding the strike;

11. Estimated fate of the animal ( e.g., dead, injured but alive, injured and moving, blood or tissue observed in the water, status unknown, disappeared); and

12. To the extent practicable, photographs or video footage of the animal(s).

Negligible Impact Analysis and Determination

NMFS has defined negligible impact as an impact resulting from the specified activity that cannot be reasonably expected to, and is not reasonably likely to, adversely affect the species or stock through effects on annual rates of recruitment or survival (50 CFR 216.103). A negligible impact finding is based on the lack of likely adverse effects on annual rates of recruitment or survival ( i.e., population-level effects). An estimate of the number of takes alone is not enough information on which to base an impact determination. In addition to considering estimates of the number of marine mammals that might be “taken” through harassment, NMFS considers other factors, such as the likely nature of any impacts or responses ( e.g., intensity, duration), the context of any impacts or responses ( e.g., critical reproductive time or location, foraging impacts affecting energetics), as well as effects on habitat, and the likely effectiveness of the mitigation. We also assess the number, intensity, and context of estimated takes by evaluating this information relative to population status. Consistent with the 1989 preamble for NMFS' implementing regulations (54 FR 40338, September 29, 1989), the impacts from other past and ongoing anthropogenic activities are incorporated into this analysis via their impacts on the baseline ( e.g., as reflected in the regulatory status of the species, population size and growth rate where known, ongoing sources of human-caused mortality, or ambient noise levels).

To avoid repetition, the discussion of our analysis applies to all the species listed in table 3, given that the anticipated effects of this activity on these different marine mammal stocks are expected to be similar in nature. Where there are meaningful differences between species or stocks, or groups of species, in anticipated individual responses to activities, impact of expected take on the population due to differences in population status, or impacts on habitat, they are included as separate sub-sections below. Specifically, we provide additional discussion related to NARW and to other species currently experiencing UMEs.

NMFS does not anticipate that serious injury or mortality would occur as a result from HRG surveys, even in the absence of mitigation, and no serious injury or mortality is proposed to be authorized. As discussed in the Potential Effects of Specified Activities on Marine Mammals and Their Habitat section, non-auditory physical effects, auditory physical effects, and vessel strike are not expected to occur. NMFS expects that all potential takes would be in the form of Level B harassment in the form of temporary avoidance of the area or decreased foraging (if such activity was occurring), reactions that are considered to be of low severity and with no lasting biological consequences ( e.g., Southall et al., 2007, Ellison et al., 2012).

In addition to being temporary, the maximum expected harassment zone around a survey vessel is 56 m. Therefore, the ensonified area surrounding each vessel is relatively small compared to the overall distribution of the animals in the area and their use of the habitat. Feeding behavior is not likely to be significantly impacted as prey species are mobile and are broadly distributed throughout the proposed Survey Area; therefore, marine mammals that may be temporarily displaced during survey activities are expected to be able to resume foraging once they have moved away from areas with disturbing levels of underwater noise. Because of the temporary nature of the disturbance and the availability of similar habitat and resources in the surrounding area, the impacts to marine mammals and the food sources that they utilize are not expected to cause significant or long-term consequences for individual marine mammals or their populations.

There are no rookeries, mating or calving grounds known to be biologically important to marine mammals within the proposed Survey Area and there are no feeding areas known to be biologically important to marine mammals within the Survey Area. There is no designated critical habitat for any ESA-listed marine mammals in the Survey Area.

North Atlantic Right Whales

The status of the NARW population is of heightened concern and, therefore, merits additional analysis. As noted previously, elevated NARW mortalities began in June 2017 and there is an active UME. Overall, preliminary findings attribute human interactions, specifically vessel strikes and entanglements, as the cause of death for the majority of NARWs. As noted previously, the Survey Area overlaps a migratory corridor BIA for NARWs that extends from Massachusetts to Florida and from the coast to beyond the shelf break. Due to the fact that the proposed survey activities are temporary (will occur for up to 1 year) and the spatial extent of sound produced by the survey would be small relative to the spatial extent of the available migratory habitat in the BIA, NARW migration is not expected to be impacted by the survey. This important migratory area is approximately 269,488 km² in size (compared with the approximately 3,228 km² of total estimated Level B harassment ensonified area associated with the Survey Area) and is comprised of the waters of the continental shelf offshore the East Coast of the United States, extending from Florida through Massachusetts.

Given the relatively small size of the ensonified area, it is unlikely that prey availability would be adversely affected by HRG survey operations. Required vessel strike avoidance measures will also decrease risk of vessel strike during migration; no vessel strike is expected to occur during Atlantic Shores' proposed activities. Additionally, only very limited take by Level B harassment of NARWs has been requested and is being proposed for authorization by NMFS as HRG survey operations are required to maintain and implement a 500-m shutdown zone. The 500-m shutdown zone for NARWs is conservative, considering the Level B harassment zone for the acoustic source ( i.e., sparker) is estimated to be 56 m, and thereby minimizes the intensity and duration of any potential incidents of behavioral harassment for this species. As noted previously, Level A harassment is not expected due to the small estimated zones in conjunction with the aforementioned shutdown requirements. NMFS does not anticipate NARW takes that would result from Atlantic Shores' proposed activities would impact annual rates of recruitment or survival. Thus, any takes that occur would not result in population level impacts.

Other Marine Mammal Species With Active UMEs

As noted previously, there are several active UMEs occurring in the vicinity of Atlantic Shores' Survey Area. Elevated humpback whale mortalities have occurred along the Atlantic coast from Maine through Florida since January 2016. Of the cases examined, approximately half had evidence of human interaction ( i.e., vessel strike, entanglement). The UME does not yet provide cause for concern regarding population-level impacts. Despite the UME, the relevant population of humpback whales (the West Indies breeding population, or DPS) remains stable at approximately 12,000 individuals.

Beginning in January 2017, elevated minke whale strandings have occurred along the Atlantic coast from Maine through South Carolina, with highest numbers in Massachusetts, Maine, and New York. This event does not provide cause for concern regarding population level impacts, as the likely population abundance is greater than 20,000 whales.

Elevated numbers of harbor seal and gray seal mortalities were first observed from 2018–2020 and, as part of a separate UME, again in 2022. These have occurred across Maine, New Hampshire, and Massachusetts. Based on tests conducted so far, the main pathogen found in the seals is phocine distemper virus (2018–2020) and avian influenza (2022), although additional testing to identify other factors that may be involved in the UMEs is underway. The UMEs do not provide cause for concern regarding population-level impacts to any of these stocks. For harbor seals, the population abundance is over 60,000 and annual M/SI (339) is well below PBR (1,729) (Hayes et al., 2022). The population abundance for gray seals in the United States is over 27,000, with an estimated abundance, including seals in Canada, of approximately 450,000. In addition, the abundance of gray seals is likely increasing in the U.S. Atlantic as well as in Canada (Hayes et al., 2021, Hayes et al., 2022).

The required mitigation measures are expected to reduce the number and/or severity of takes for all species listed in table 3, including those with active UMEs, to the level of least practicable adverse impact. In particular, they would provide animals the opportunity to move away from the sound source before HRG survey equipment reaches full energy, thus preventing them from being exposed to sound levels that have the potential to cause injury. No Level A harassment is anticipated, even in the absence of mitigation measures, or proposed for authorization.

NMFS expects that takes would be in the form of short-term Level B harassment by way of brief startling reactions and/or temporary vacating of the area, or decreased foraging (if such activity was occurring)—reactions that (at the scale and intensity anticipated here) are considered to be of low severity, with no lasting biological consequences. Since both the sources and marine mammals are mobile, animals would only be exposed briefly to a small ensonified area that might result in take. Additionally, required mitigation measures would further reduce exposure to sound that could result in more severe behavioral harassment.

In summary and as described above, the following factors primarily support our preliminary determination that the impacts resulting from this activity are not expected to adversely affect any of the species or stocks through effects on annual rates of recruitment or survival:

• No serious injury or mortality is anticipated or proposed to be authorized;
• No Level A harassment (PTS) is anticipated, even in the absence of mitigation measures, or proposed to be authorized;
• Foraging success is not likely to be significantly impacted as effects on species that serve as prey species for marine mammals from the survey are expected to be minimal;
• The availability of alternate areas of similar habitat value for marine mammals to temporarily vacate the ensonified areas during the proposed survey to avoid exposure to sounds from the activity;
• Take is anticipated to be by Level B harassment only consisting of brief startling reactions and/or temporary avoidance of the ensonified area;
• Survey activities would occur in such a comparatively small portion of the BIA for the NARW migration that any avoidance of the area due to survey activities would not affect migration. In addition, mitigation measures require shutdown at 500 m (over eight times the size of the Level B harassment zone of 56 m) to minimize the effects of any Level B harassment take of the species; and
• The proposed mitigation measures, including visual monitoring and shutdowns, are expected to minimize potential impacts to marine mammals.

Based on the analysis contained herein of the likely effects of the specified activity on marine mammals and their habitat, and taking into consideration the implementation of the proposed monitoring and mitigation measures, NMFS preliminarily finds that the total marine mammal take from the proposed activity will have a negligible impact on all affected marine mammal species or stocks.

Small Numbers

As noted previously, only take of small numbers of marine mammals may be authorized under sections 101(a)(5)(A) and (D) of the MMPA for specified activities other than military readiness activities. The MMPA does not define small numbers and so, in practice, where estimated numbers are available, NMFS compares the number of individuals taken to the most appropriate estimation of abundance of the relevant species or stock in our determination of whether an authorization is limited to small numbers of marine mammals. When the predicted number of individuals to be taken is fewer than one-third of the species or stock abundance, the take is considered to be of small numbers. Additionally, other qualitative factors may be considered in the analysis, such as the temporal or spatial scale of the activities.

NMFS proposes to authorize incidental take by Level B harassment only of 14 marine mammal species with 15 managed stocks. The total amount of takes proposed for authorization relative to the best available population abundance is less than 1 percent for 14 of the 15 managed stocks (less than 7 percent for the Western North Atlantic Northern Migratory Coastal Stock of bottlenose dolphins; table 5). The take numbers proposed for authorization are considered conservative estimates for purposes of the small numbers determination as they assume all takes represent different individual animals, which is unlikely to be the case.

Based on the analysis contained herein of the proposed activity (including the proposed mitigation and monitoring measures) and the anticipated take of marine mammals, NMFS preliminarily finds that small numbers of marine mammals would be taken relative to the population size of the affected species or stocks.

Unmitigable Adverse Impact Analysis and Determination

There are no relevant subsistence uses of the affected marine mammal stocks or species implicated by this action. Therefore, NMFS has determined that the total taking of affected species or stocks would not have an unmitigable adverse impact on the availability of such species or stocks for taking for subsistence purposes.

Endangered Species Act

Section 7(a)(2) of the ESA of 1973 (16 U.S.C. 1531 et seq.) requires that each Federal agency insure that any action it authorizes, funds, or carries out is not likely to jeopardize the continued existence of any endangered or threatened species or result in the destruction or adverse modification of designated critical habitat. To ensure ESA compliance for the issuance of IHAs, NMFS consults internally whenever we propose to authorize take for endangered or threatened species.

NMFS' Office of Protected Resources is proposing to authorize take of three species of marine mammals which are listed under the ESA ( i.e., NARW, fin whale, and sei whale) and has determined these activities fall within the scope of activities analyzed in the NMFS GARFO programmatic consultation regarding geophysical surveys along the U.S. Atlantic coast in the three Atlantic Renewable Energy Regions (completed June 29, 2021; revised September 2021).

Proposed Authorization

As a result of these preliminary determinations, NMFS proposes to issue an IHA to Atlantic Shores for conducting marine site characterization surveys in waters off of New York, New Jersey, Delaware, and Maryland for a period of 1 year, provided the previously mentioned mitigation, monitoring, and reporting requirements are incorporated. A draft of the proposed IHA can be found at: https://www.fisheries.noaa.gov/national/marine-mammal-protection/incidental-take-authorizations-other-energy-activities-renewable.

Request for Public Comments

We request comment on our analyses, the proposed authorization, and any other aspect of this notice of proposed IHA for the proposed marine site characterization surveys. We also request comment on the potential renewal of this proposed IHA as described in the paragraph below. Please include with your comments any supporting data or literature citations to help inform decisions on the request for this IHA or a subsequent renewal IHA.

On a case-by-case basis, NMFS may issue a one-time, 1-year renewal IHA following notice to the public providing an additional 15 days for public comments when (1) up to another year of identical or nearly identical activities as described in the Description of Proposed Activity section of this notice is planned or (2) the activities as described in the Description of Proposed Activity section of this notice would not be completed by the time the IHA expires and a renewal would allow for completion of the activities beyond that described in the Dates and Duration section of this notice, provided all of the following conditions are met:

• A request for renewal is received no later than 60 days prior to the needed renewal IHA effective date (recognizing that the renewal IHA expiration date cannot extend beyond one year from expiration of the initial IHA).
• The request for renewal must include the following:

(1) An explanation that the activities to be conducted under the requested renewal IHA are identical to the activities analyzed under the initial IHA, are a subset of the activities, or include changes so minor ( e.g., reduction in pile size) that the changes do not affect the previous analyses, mitigation and monitoring requirements, or take estimates (with the exception of reducing the type or amount of take).

(2) A preliminary monitoring report showing the results of the required monitoring to date and an explanation showing that the monitoring results do not indicate impacts of a scale or nature not previously analyzed or authorized.

Upon review of the request for renewal, the status of the affected species or stocks, and any other pertinent information, NMFS determines that there are no more than minor changes in the activities, the mitigation and monitoring measures will remain the same and appropriate, and the findings in the initial IHA remain valid.