Sec. 4.12. PAYMENT FOR WORK. (a) The district shall pay the contract price of construction, renovation, or repair contracts in accordance with this section.

(b) The district shall make progress payments under contracts monthly as the work proceeds or at more frequent intervals as determined by the board.

(c) If requested by the board, the contractor shall furnish an analysis of the total contract price showing the amount included for each principal category of the work, in such detail as requested, to provide a basis for determining progress payments.

(d) In making progress payments, 10 percent of the estimated amount shall be retained until final completion and acceptance of the contract work. However, if the board, at any time after 50 percent of the work has been completed, finds that satisfactory progress is being made, it may authorize any of the remaining progress payments to be made in full. Also, if the work is substantially complete, the board, if it finds the amount retained to be in excess of the amount adequate for the protection of the district, may release to the contractor all or a portion of the excess amount.

(e) On completion and acceptance of each separate project, work, or other division of the contract, on which the price is stated separately in the contract, payment may be made without retention of a percentage.

(f) When work is completed according to the terms of the contract, the board shall draw a warrant on the depository to pay any balance due on the contract.