Each member of the Board shall receive for his or her services for time actually in attendance upon Board meetings and affairs of the Board only, the amount of per diem provided by N.C. Gen. Stat. § 138-5 and shall be reimbursed for subsistence, mileage and necessary expenses incurred in the discharge of such duties at the same rates as set forth in N.C. Gen. Stat. § 138-6 and N.C. Gen. Stat. § 138-7 (1951, c. 1089, s. 15; 1953, c. 894; 1965, c. 730; 1969, c. 445, s. 6; 1981, c. 600, s. 15.)