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 Department of Commerce National Oceanic and Atmospheric Administration [RTID 0648-XE282]
 AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce.
 ACTION: Notice of issuance of letter of authorization.
 SUMMARY: In accordance with the Marine Mammal Protection Act (MMPA), as amended, its implementing regulations, and NMFS' MMPA Regulations for Taking Marine Mammals Incidental to Geophysical Surveys Related to Oil and Gas Activities in the Gulf of Mexico, notification is hereby given that NMFS has issued a Letter of Authorization (LOA) to LLOG Exploration Offshore, LLC (LLOG) for the take of marine mammals incidental to geophysical survey activity in the Gulf of Mexico (GOM).
 DATES: The LOA is effective from September 16, 2024, through April 19, 2026.
 ADDRESSES: The LOA, LOA request, and supporting documentation are available online at: 
                        *https://www.fisheries.noaa.gov/​action/​incidental-take-authorization-oil-and-gas-industry-geophysical-survey-activity-gulf-mexico.*
                         In case of problems accessing these documents, please call the contact listed below (see 
                        **FOR FURTHER INFORMATION CONTACT**
                         section).
 FOR FURTHER INFORMATION CONTACT: Rachel Wachtendonk, Office of Protected Resources, NMFS, (301) 427-8401.


SUPPLEMENTARY INFORMATION: Background Sections 101(a)(5)(A) and (D) of the MMPA (16 U.S.C. 1361 
                    *et seq.*) direct the Secretary of Commerce to allow, upon request, the incidental, but not intentional, taking of small numbers of marine mammals by U.S. citizens who 
                    ( print page 77476)
                    engage in a specified activity (other than commercial fishing) within a specified geographical region if certain findings are made and either regulations are issued or, if the taking is limited to harassment, a notice of a proposed authorization is provided to the public for review. An authorization for incidental takings shall be granted if NMFS finds that the taking will have a negligible impact on the species or stock(s), will not have an unmitigable adverse impact on the availability of the species or stock(s) for subsistence uses (where relevant), and if the permissible methods of taking and requirements pertaining to the mitigation, monitoring and reporting of such takings are set forth. NMFS has defined “negligible impact” in 50 CFR 216.103 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. Except with respect to certain activities not pertinent here, 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). On January 19, 2021, we issued a final rule with regulations to govern the unintentional taking of marine mammals incidental to geophysical survey activities conducted by oil and gas industry operators, and those persons authorized to conduct activities on their behalf (collectively “industry operators”), in U.S. waters of the GOM over the course of 5 years (86 FR 5322, January 19, 2021). The rule was based on our findings that the total taking from the specified activities over the 5-year period will have a negligible impact on the affected species or stock(s) of marine mammals and will not have an unmitigable adverse impact on the availability of those species or stocks for subsistence uses, and became effective on April 19, 2021. The regulations at 50 CFR 217.180 
                    *et seq.*
                     allow for the issuance of LOAs to industry operators for the incidental take of marine mammals during geophysical survey activities and prescribe the permissible methods of taking and other means of effecting the least practicable adverse impact on marine mammal species or stocks and their habitat (often referred to as mitigation), as well as requirements pertaining to the monitoring and reporting of such taking. Under § 217.186 (e), issuance of an LOA shall be based on a determination that the level of taking will be consistent with the findings made for the total taking allowable under these regulations and a determination that the amount of take authorized under the LOA is of no more than small numbers. NMFS subsequently discovered that the 2021 rule was based on erroneous take estimates. We conducted another rulemaking using correct take estimates and other newly available and pertinent information relevant to the analyses supporting some of the findings in the 2021 final rule and the taking allowable under the regulations. We issued a final rule in April 2024, effective May 24, 2024 (89 FR 31488, April 24, 2024). The 2024 final rule made no changes to the specified activities or the specified geographical region in which those activities would be conducted, nor to the original 5-year period of effectiveness. In consideration of the new information, the 2024 rule presented new analyses supporting affirmance of the negligible impact determinations for all species, and affirmed that the existing regulations, which contain mitigation, monitoring, and reporting requirements, are consistent with the “least practicable adverse impact” standard of the MMPA. Summary of Request and Analysis LLOG plans to conduct a Zero Offset, Offset, or Walkaway vertical seismic profile (VSP), Salt Proximity Survey, and/or Checkshot survey in lease block OCS-G 36103 AC 337, with water depths ranging from approximately 1,200 to 1,500 meters (m). LLOG plans to use either a 12-element, 2,400 cubic inch (in3
                    ) airgun array, or a 6-element, 1,500 in3
                     airgun array. See section G of the LOA application for a map of the area. Consistent with the preamble to the final rule, the survey effort proposed by LLOG in its LOA request was used to develop LOA-specific take estimates based on the acoustic exposure modeling results described in the preamble (89 FR 31488, April 24, 2024). In order to generate the appropriate take number for authorization, the following information was considered: (1) survey type; (2) location (by modeling zone [1]
                    
                    ); (3) number of days; (4) source; and (5) month.[2]
                    
                     In this case, the 4,130 in3
                     airgun array was selected. The acoustic exposure modeling performed in support of the rule provides 24-hour exposure estimates for each species, specific to each modeled source and survey type in each zone and month. No VSP surveys were included in the modeled survey types, and use of existing proxies (
                    *i.e.,*
                     two-dimensional (2D), 3D (narrow-azimuth) NAZ, 3D (wide-azimuth) WAZ, Coil) is generally conservative for use in evaluation of VSP survey effort, largely due to the greater area covered by the modeled proxies. Summary descriptions of these modeled survey geometries are available in the preamble to the 2018 proposed rule (83 FR 29212, 29220, June 22, 2018). Coil was selected as the best available proxy survey type in this case because the spatial coverage of the planned survey is most similar to the coil survey pattern. For the planned survey, the seismic source array will be deployed in one of the following forms: Zero Offset VSP—deployed from a drilling rig at or near the borehole, with the seismic receivers (
                    *i.e.,*
                     geophones) deployed in the borehole on wireline at specified depth intervals; Offset VSP—in a fixed position deployed from a supply vessel on an offset position; Walkaway VSP—attached to a line, or a series of lines, towed by a supply vessel; 3D VSP—source moves along a spiral or line swaths towed by a supply vessel; Salt-Proximity—consists typically of a combination of both Zero Offset VSP plus a fixed Offset VSP; or Checkshot—similar to Zero Offset VSP, typically hung from a platform and a sensor placed at a few depths in the well, where only the first energy arrival is recorded. The coil survey pattern in the model was assumed to cover approximately 144 kilometers squared (km2
                    ) per day (compared with approximately 795 km2
                    , 199 km2
                    , and 845 km2
                     per day for the 2D, 3D NAZ, and 3D WAZ survey patterns, respectively). Among the different parameters of the modeled survey patterns (
                    *e.g.,*
                     area covered, line spacing, number of sources, shot interval, total simulated pulses), NMFS considers area covered per day to be most influential on daily modeled exposures exceeding Level B harassment criteria. Because LLOG's planned survey is expected to cover no additional area as a stationary source, the coil proxy is most 
                    ( print page 77477)
                    representative of the effort planned by LLOG in terms of predicted Level B harassment. The survey will take place over approximately 5 days in zone 6. The monthly distribution of survey days is not known in advance. Take estimates for each species are based on the month that produces the greatest value. Based on the results of our analysis, NMFS has determined that the level of taking expected for this survey and authorized through the LOA is consistent with the findings made for the total taking allowable under the regulations. See table 1 in this notice and table 6 of the rule (89 FR 31488, April 24, 2024). Small Numbers Determination Under the GOM rule, NMFS may not authorize incidental take of marine mammals in an LOA if it will exceed “small numbers.” In short, when an acceptable estimate of the individual marine mammals taken is available, if the estimated number of individual animals taken is up to, but not greater than, one-third of the best available abundance estimate, NMFS will determine that the numbers of marine mammals taken of a species or stock are small (89 FR 31535, May 24, 2024). For more information please see NMFS' discussion of small numbers in the 2021 final rule (86 FR 5438, January 19, 2021). The take numbers for authorization are determined as described above in the Summary of Request and Analysis section, are used by NMFS in making the necessary small numbers determinations, through comparison with the best available abundance estimates (see discussion at 86 FR 5322, 5391, January 19, 2021). For this comparison, NMFS' approach is to use the maximum theoretical population, determined through review of current stock assessment reports (SAR; 
                    *https://www.fisheries.noaa.gov/​national/​marine-mammal-protection/​marine-mammal-stock-assessments*) and model-predicted abundance information (
                    *https://seamap.env.duke.edu/​models/​Duke/​GOM/​*). Information supporting the small numbers determinations is provided in table 1. Table 1—Take Analysis 1
Species
Authorized take
Abundance 2
Percent 
                             abundanceRice's whale
0
51
n/aSperm whale
38
3,007
1.3*Kogia*
                             spp
3
                             15
980
1.5Beaked whales
15
803
1.9Rough-toothed dolphin
103
4,853
2.1Bottlenose dolphin
154
165,125
0.1Clymene dolphin
190
4,619
4.1Atlantic spotted dolphin
248
21,506
1.2Pantropical spotted dolphin
751
67,225
1.1Spinner dolphin
4
                             0
5,548
n/aStriped dolphin
112
5,634
2.0Fraser's dolphin
5
                             65
1,665
3.9Risso's dolphin
28
1,974
1.4Blackfish 6
296
6,113
4.8Short-finned pilot whale
153
2,741
5.61
                         Scalar ratios were not applied in this case due to brief survey duration.2
                         Best abundance estimate. For most taxa, the best abundance estimate for purposes of comparison with take estimates is considered here to be the model-predicted abundance (Garrison 
                        *et al.,*
                         2023). For Rice's whale, Atlantic spotted dolphin, and Risso's dolphin, the larger estimated SAR abundance estimate is used.3
                         Includes 1 take by Level A harassment and 14 takes by Level B harassment. Small numbers determination made on basis of scaled Level B harassment take plus authorized Level A harassment take.4
                         Modeled take of 1 rounded down to 0.5
                         Modeled take of 41 increased to account for potential encounter with a group of average size (Maze-Foley and Mullin, 2006).6
                         The “blackfish” guild includes melon-headed whales, false killer whales, pygmy killer whales, and killer whales.
 Based on the analysis contained herein of LLOG's proposed survey activity described in its LOA application and the anticipated take of marine mammals, NMFS finds that small numbers of marine mammals will be taken relative to the affected species or stock sizes (
                    *i.e.,*
                     less than one-third of the best available abundance estimate) and therefore the taking is of no more than small numbers. Authorization NMFS has determined that the level of taking for this LOA request is consistent with the findings made for the total taking allowable under the incidental take regulations and that the amount of take authorized under the LOA is of no more than small numbers. Accordingly, we have issued an LOA to LLOG authorizing the take of marine mammals incidental to its geophysical survey activity, as described above. Dated: September 17, 2024. Kimberly Damon-Randall, Director, Office of Protected Resources, National Marine Fisheries Service.


# Footnotes

1.
    
                         For purposes of acoustic exposure modeling, the GOM was divided into seven zones. Zone 1 is not included in the geographic scope of the rule. Back to Citation
 2.
    
                         Acoustic propagation modeling was performed for two seasons: winter (December-March) and summer (April-November). Marine mammal density data is generally available on a monthly basis, and therefore further refines take estimates temporally. Back to Citation


[FR Doc. 2024-21612 Filed 9-20-24; 8:45 am] BILLING CODE 3510-22-P