Whenever the Secretary of Agriculture makes a determination that a forest development road referred to in subsection (a) shall be constructed or paid for, in whole or in part, by a purchaser of national forest timber or other forest products, the Secretary shall include notice of the determination in the notice of sale of the timber or other forest products. The notice of sale shall contain, or announce the availability of, sufficient information related to the road described in the notice to permit a prospective bidder on the sale to calculate the likely cost that would be incurred by the bidder to construct or finance the construction of the road so that the bidder may reflect such cost in the bid.

If there is an increase or decrease in the cost of roads constructed by the timber purchaser, caused by variations in quantities, changes or modifications subsequent to the sale of timber made in accordance with applicable timber sale contract provisions, then an adjustment to the price paid for timber harvested by the purchaser shall be made. The adjustment shall be applied by the Secretary as soon as practicable after any such design change is implemented.

A notice of sale referred to in subsection (b) containing specified road construction of $50,000 or more, shall give a purchaser of national forest timber or other forest products that qualifies as a “small business concern” under the Small Business Act (15 U.S.C. 631 et seq.), and regulations issued thereunder, the option to elect that the Secretary of Agriculture build the roads described in the notice. The Secretary shall provide the small business concern with an estimate of the cost that would be incurred by the Secretary to construct the roads on behalf of the small business concern. The notice of sale shall also include the date on which the roads described in the notice will be completed by the Secretary if the election is made.

If the election referred to in paragraph (1) is made, the purchaser of the national forest timber or other forest products shall pay to the Secretary of Agriculture, in addition to the price paid for the timber or other forest products, an amount equal to the estimated cost of the roads which otherwise would be paid by the purchaser as provided in the notice of sale. Pending receipt of such amount, the Secretary may use receipts from the sale of national forest timber or other forest products and such additional sums as may be appropriated for the construction of roads, such funds to be available until expended, to accomplish the requested road construction.

Notwithstanding paragraph (1), any sale of national forest timber or other forest products for which notice of sale is provided before the effective date of this section, and any effective purchaser road credit earned pursuant to a contract resulting from such a notice of sale or otherwise earned before that effective date shall remain in effect, and shall continue to be subject to section 535 of this title and section 472a(i) of this title

, and rules issued thereunder, as in effect on the day before