Decisions pertaining to applications for appropriation of fifty cubic feet of water per second or less for irrigation projects promulgated by any person, private firm, private corporation or private association without resort to subsidy by either state or federal government pursuant to RCW 90.03.250 through 90.03.340, as now or hereafter amended, to be used for agricultural irrigation shall not be subject to the requirements of RCW 43.21C.030(2)(c), as now or hereafter amended.