Oregon Revised Statutes Education and Culture § 327.033

(a) Shall include depreciation of original cost to the school district of district-owned buses, not in excess of 10 percent per year; and

(b) Shall include the costs to retrofit, as defined in ORS 468A.795, or to replace school buses for the purpose of reducing or eliminating diesel engine emissions, except that the board may not include the costs paid with moneys received from the state by a school district from the Clean Diesel Engine Fund under ORS 468A.801 (2)(a) to retrofit or to replace school buses for the purpose of reducing or eliminating diesel engine emissions.

(a) The expenditure of funds attributable to costs under subsection (2)(a) of this section shall be limited to the acquisition of new buses.

(b) The expenditure of funds attributable to costs under subsection (2)(b) of this section shall be limited to the costs to retrofit, as defined in ORS 468A.795, or to replace school buses for the purpose of reducing or eliminating diesel engine emissions.