(1) The department shall use any or all of the following criteria for prioritizing the preparation or revision of SMP's in situations when several SMP's are required, based on 80-15-212 (1) , MCA and when available resources limit the department's ability to work on all of the required SMPs simultaneously:

(a) properties and volumes of the agricultural chemical(s) being used in a SMZ or region of the state that could cause ground water impairment or degradation;

(b) the concentration(s) or migration of agricultural chemicals detected in ground water;

(c) the number of persons and/or water wells that are or reasonably could be affected in a SMZ or region of the state;

(d) the problem cannot be completely corrected through an enforcement option other than a SMP;

(e) vulnerability of the ground water to impairment or degradation;

(f) other documented factors deemed appropriate by the department.