California Code, Public Resources Code - PRC § 33210

Upon the request of a city, county, or recreation and park district within the zone, upon the request of the National Park Service, or on its own initiative, the conservancy may, after public hearings and findings, and consistent with this division, amend the plan and submit it to the Secretary of the Interior for approval.  However, if the conservancy acts on its own initiative to substantially amend the plan, the action shall be subject to the same procedure for obtaining a resolution of intent to comply with the plan from the affected jurisdiction as applied to the original approval of the plan pursuant to Section 507(n)(3)(B) of the National Parks and Recreation Act of 1978 (16 U.S.C. 460kk(n)(3)(B)).  The findings shall provide that the amendments to the plan will not adversely affect the health, safety, or welfare of persons residing in the zone or of persons using the facilities located within the zone.