Revised Technical Guidance (2018)
NOAA Fisheries’ evaluation of comments received during this review affirms that the Technical Guidance is based upon the best available science. The threshold levels established in the 2016 Guidance will remain the same. Applicants when referring to Technical Guidance or its associated optional user tools should refer to the 2018 revised version of this document, not the 2016 version of the Technical Guidance.
NOAA Fisheries has revised the Technical Guidance to address implementation concerns and facilitate its use by applicants, thereby further advancing the intent of E.O. 13795. Specifically, we updated the optional User Spreadsheet tool to provide more capabilities for applicants and developed a new instructional manual for this optional tool. We also plan on convening two working groups in 2018, one to explore impacts of noise on low-frequency cetacean (baleen whale) hearing and the second to explore exposure duration for all marine mammal species. We will continue to coordinate with Federal Agencies to advance our understanding of the impacts of sound on marine mammals.
In 2018, NOAA Fisheries held a 45-day public comment period (83 FR 48291) for user feedback to help improve the usability of our optional User Spreadsheet Tool and Instruction Manual for User Spreadsheet Tool. Comments received are available on regulations.gov. In July 2020, NOAA Fisheries made some technical updates to the optional User Spreadsheet tool, as well as developed a web version of the tool (Web Calculator Tool) and corresponding instruction manuals.
In association with this 2018 public comment period, the International Association for Geophysical Contractors (IAGC) submitted their final comments to NOAA Fisheries in late 2020 (IAGC Supplemental User Guide and IAGC Alternative Calculator). Based on recommendations where NOAA Fisheries concurs with IAGC, NOAA Fisheries made additional modifications to our optional User Spreadsheet tool and associated User Manual (December 2020).
Both tools will be updated as new science or information becomes available. NOAA Fisheries plans to evaluate these tools on a regular basis (before the end of each calendar year) to incorporate any necessary updates.
Development of 2016 Technical Guidance
The 2016 Technical Guidance underwent an internal review, three external peer reviews, a follow-up peer review, three public comment periods, and received informal input from key federal partners.
External Peer Reviews
The first external peer review, which was completed September 2013, focused on the scientific and technical studies used in the analysis for the development of proposed onset PTS and TTS acoustic thresholds. (Report link)
The second external peer review evaluated a U.S. Navy Technical paper provided to NOAA in January 2015 as part of the Navy's Phase 3 Acoustic Effects Analysis. The paper describes the Navy's proposed methodology for updating auditory weighting functions and subsequent numeric thresholds for predicting auditory effects (TTS/PTS thresholds) on marine animals exposed to active sonars and other active acoustic sources utilized during Navy training and testing activities. (Report link)
Follow-up to second external review: Concurrent with the third public comment period, NOAA requested that peer reviewers of the Navy's methodology review the updated sections of the Draft Guidance and indicate whether the revisions would significantly alter any of the comments made during their original review. (Follow-up peer review charge link)
The third external peer review evaluated proposed methodology for defining threshold usage for sources characterized as impulsive or non-impulsive. This methodology was modified using comments from the initial public comment period. (Report link)
More information about these additional peer reviews
First Public Comment Period
The comment period on the initial draft guidance opened in December 2013 (78 FR 78822) and closed on March 13, 2014 (79 FR 4672). Comments received are available on regulations.gov.
During this time NOAA Fisheries held a public meeting to inform interested parties and solicit comments on the proposed acoustic guidance. The meeting was held on January 14, 2014, in the NOAA Science Center in Silver Spring, MD. A transcript (Download File PDF, 10 pages) from the meeting is available as well as the Public Meeting One-Pager (Download File PDF, 2 pages) and Presentation (Download File PDF, 17 pages).
Second Public Comment Period
The second public comment period opened on July 31, 2015 and closed September 14, 2015 (80 FR 45642). Comments received are available on regulations.gov.
Third Public Comment Period
The third public comment period opened on March 16, 2016 and closed March 30, 2016 (81 FR 14095). Comments received are available on regulations.gov.
Finalization of 2016 Technical Guidance
The 2016 Technical Guidance was finalized on August 4th, 2016 with publication of a Federal Register Notice (81 FR 51693), which included:
- Responses to relevant and substantive comments made during all three public comment periods
- Explanation on how NOAA and applicants should transition to use of this Technical Guidance
Other NMFS Acoustic Thresholds and Tools
For more information, please contact:
Amy R. Scholik-Schlomer
NMFS Protected Resources Acoustic Coordinator
1315 East West Highway
Silver Spring, MD 20910
(301) 427-8449
Amy.Scholik@noaa.gov
Humpback whales swimming underwater. Credit: Kogia.org
A Rice’s whale just under the surface of the water in the Gulf of Mexico. This endangered whale was recognized as a separate species from the Bryde’s whale in 2021. Credit: NOAA Fisheries under NOAA Permit No. 21938.
Pair of bottlenose dolphins. Credit: NOAA Pacific Islands Fisheries Science Center/Lisa Morse.
A humpback mother and calf swimming off the West Coast. Credit: NOAA Fisheries/Ed Lyman. NOAA Fisheries Permit #14682.