Pursuant to § 1210.340, the Board shall reimburse the Department of Agriculture for referendum and administrative costs incurred by the Department with respect to the Plan. The Board shall pay those costs incurred by the Department for the conduct of Department duties under the Plan as determined periodically by the Secretary. The Department will bill the Board monthly and payment shall be due promptly after the billing of such costs. Funds to cover such expenses shall be paid from assessments collected pursuant to § 1210.341.