; and (2) make reasonable efforts to avoid adversely impacting the domestic sawmill industry in the State of California. (c) Special contract provisions The Secretary of Agriculture may adjust contract provisions for Forest Service contracts in region 5 of the National Forest System as the Secretary considers appropriate to ensure successful implementation of, and compliance with, the regulations issued under subsection (a). (d) Relation to limitations on timber substitution Section 490 of the Forest Resources Conservation and Shortage Relief Act of 1990 ( 16 U.S.C. 620b ) shall not apply to unprocessed timber designated as surplus pursuant to the regulations issued under subsection (a). (e) Additional staff for Implementation Using funds otherwise available to the Forest Service for management, protection, improvement, and utilization of the National Forest System, the Secretary of Agriculture may hire additional Forest Service employees to implement the regulations issued under subsection (a). (f) Duration of regulations