; and (3) $4,470 per inspection for non-rig units operating in water depths of less than 500 feet. (e) The Secretary shall bill designated operators under subsection (b) quarterly, with payment required within 30 days of billing. The Secretary shall bill designated operators under subsection (c) within 30 days of the end of the month in which the inspection occurred, with payment required within 30 days of billing. The Secretary shall bill designated operators under subsection (d) with payment required by the end of the following quarter. CONTRACTS AND AGREEMENTS FOR WILD HORSE AND BURRO HOLDING FACILITIES 108. Notwithstanding any other provision of this Act, the Secretary of the Interior may enter into multiyear cooperative agreements with nonprofit organizations and other appropriate entities, and may enter into multiyear contracts in accordance with the provisions of section 3903 of title 41, United States Code (except that the 5-year term restriction in subsection (a) shall not apply), for the long-term care and maintenance of excess wild free roaming horses and burros by such organizations or entities on private land. Such cooperative agreements and contracts may not exceed 10 years, subject to renewal at the discretion of the Secretary. MASS MARKING OF SALMONIDS 109. The United States Fish and Wildlife Service shall, in carrying out its responsibilities to protect threatened and endangered species of salmon, implement a system of mass marking of salmonid stocks, intended for harvest, that are released from federally operated or federally financed hatcheries including but not limited to fish releases of coho, chinook, and steelhead species. Marked fish must have a visible mark that can be readily identified by commercial and recreational fishers. CONTRACTS AND AGREEMENTS WITH INDIAN AFFAIRS 110. Notwithstanding any other provision of law, during fiscal year 2024, in carrying out work involving cooperation with State, local, and tribal governments or any political subdivision thereof, Indian Affairs may