Construction Cost Index–Composite Trend. (2) Construction costs adjustment The amounts appropriated under subsection (a) shall be adjusted to address construction cost changes necessary to account for unforeseen market volatility that may not otherwise be captured by engineering cost indices, as determined by the Secretary, including repricing applicable to the types of construction and current industry standards involved. (3) Repetition The adjustment process under this subsection shall be repeated for each subsequent amount appropriated until the applicable amount, as adjusted, has been appropriated. (4) Period of indexing The period of indexing and adjustment under this subsection for any increment of funding shall start on October 1, 2021, and shall end on the date on which funds are deposited in the applicable Pueblo Trust Fund. (c) State cost share Pursuant to the Agreement, the State shall contribute— (1) $23,500,000, as adjusted for inflation pursuant to the Agreement, for the Joint Grants-Milan Project for Water Re-Use, Water Conservation and Augmentation of the Rio San José, the Village of Milan Projects Fund, and the City of Grants Projects Fund