If applications are made for the use of the groundwater reserved in WAC 173-591-070(2) for purposes other than public water supplies, as defined in WAC 173-591-050 (6) and (7), the director may issue a permit allowing such uses but these uses shall be junior in priority to all rights issued pursuant to WAC 173-591-070. Interim uses authorized in this section may be reduced or curtailed in right when necessary to allow to full utilization of higher priority rights established in WAC 173-591-070. The department may limit or otherwise condition junior water rights permits as necessary to ensure availability of the reserved groundwaters for public water supply purposes consistent with this chapter.