No person shall be eligible for a cost-share assistance grant under ORS 569.370 and 569.470 to 569.495 unless:
(1) A weed control inspector has:
(a) Conducted a field inspection of the weed control site;
(b) Approved the eligible person’s plan for implementing a weed control project; and
(c) Certified that specific expenditures are appropriate for implementation of the project.
(2) The eligible person has made certified expenditures for the purpose of implementing an approved weed control project. Adequate proof of such expenditures shall consist of:
(a) Receipts, invoices or other evidence indicating the amount and cost of the project; and
(b) Such other weed control information as the county court or commission may require.