Section 217.167 - Renewals and modifications of Letters of Authorization and adaptive management(a) An LOA issued under §§ 216.106 of this chapter and 217.166 for the activity identified in § 217.160(c) may be renewed or modified upon request by the applicant, provided that the following are met: (1) Notification to NMFS that the activity described in the application submitted under § 217.160(a) will be undertaken and that there will not be a substantial modification to the described work, mitigation or monitoring undertaken during the upcoming or remaining LOA period;(2) Timely receipt (by the dates indicated) of monitoring reports, as required under § 217.165(C)(3) ;(3) A determination by the NMFS that the mitigation, monitoring and reporting measures required under § 217.165(c) and the LOA issued under §§ 216.106 of this chapter and 217.166, were undertaken and are expected to be undertaken during the period of validity of the LOA.(b) If a request for a renewal of a Letter of Authorization indicates that a substantial modification, as determined by NMFS, to the described work, mitigation or monitoring undertaken during the upcoming season will occur, NMFS will provide the public a period of 30 days for review and comment on the request as well as the proposed modification to the LOA. Review and comment on renewals of Letters of Authorization are restricted to: (1) New cited information and data indicating that the original determinations made for the regulations are in need of reconsideration; and(2) Proposed changes to the mitigation and monitoring requirements contained in these regulations or in the current Letter of Authorization.(c) A notice of issuance or denial of a renewal of a Letter of Authorization will be published in the FEDERAL REGISTER within 30 days of a determination.(d) An LOA issued under §§ 216.16 of this chapter and 217.166 for the activity identified in § 217.160 may be modified by NMFS under the following circumstances: (1)Adaptive management. NMFS, in response to new information and in consultation with Hilcorp, may modify the mitigation or monitoring measures in subsequent LOAs if doing so creates a reasonable likelihood of more effectively accomplishing the goals of mitigation and monitoring set forth in the preamble of these regulations. (i) Possible sources of new data that could contribute to the decision to modify the mitigation or monitoring measures include: (A) Results from Hilcorp's monitoring from the previous year(s).(B) Results from marine mammal and/or sound research or studies.(C) Any information that reveals marine mammals may have been taken in a manner, extent or number not authorized by these regulations or subsequent LOAs.(ii) If, through adaptive management, the modifications to the mitigation, monitoring, or reporting measures are substantial, NMFS will publish a notice of proposed LOA in the FEDERAL REGISTER and solicit public comment.(2)Withdrawal or suspension. NMFS will withdraw or suspend an LOA if, after notice and opportunity for public comment, NMFS determines these regulations are not being substantially complied with or that the taking allowed is or may be having more than a negligible impact on an affected species or stock specified in § 217.162(b) or an unmitigable adverse impact on the availability of the species or stock for subsistence uses. The requirement for notice and comment will not apply if NMFS determines that an emergency exists that poses a significant risk to the well-being of the species or stocks of marine mammals. Notice will be published in the FEDERAL REGISTER within 30 days of such action.