Section 217.160 - Specified activity and specified geographical region(a) Regulations in this subpart apply only to Hilcorp Alaska LLC (Hilcorp) and those persons it authorizes or funds to conduct activities on its behalf for the taking of marine mammals that occurs in the area outlined in paragraph (b) of this section and that occurs incidental to the activities described in paragraph (c) of this section.(b) The taking of marine mammals by Hilcorp may be authorized in Letters of Authorization (LOAs) only if it occurs within the action area defined in Cook Inlet, Alaska.(c) The taking of marine mammals by Hilcorp is only authorized if it occurs incidental to Hilcorp's oil and gas activities including use of seismic airguns, sub-bottom profiler, vertical seismic profiling, pile driving, conductor pipe driving, and water jets.