Oregon Revised Statutes Public Lands § 274.230

(a) To drain the submersible and submerged lands substantially in accordance with the plans set forth in the contract;

(b) To make such proofs of reclamation as are required by the department;

(c) To pay all costs incident to the contract and making of the proof and any other expense connected therewith;

(d) That work will be commenced upon the ditches or other works necessary for such drainage and reclamation at a time fixed by the department and agreed upon in the contract;

(e) That by the end of the first year after the time fixed in the contract for beginning such work, 10 percent of the necessary expenditure will be made; and

(f) That this work will be prosecuted with due diligence until complete and the required proof of reclamation is made.