Claims against the district for administrative expenses and for the costs of operation and maintenance of the system of improvement, shall be allowed by the district board and presented to the county auditor with proper vouchers attached for the issuance of warrants against the expense fund of the district. The payroll of the district shall be verified by the foreman in charge and may be presented in one claim for the individual claimants involved. The warrants for said claim shall be issued in the name of the individual claimants, but may be receipted for by said foreman.