A multiple system of treatment devices and disposal facilities may be permitted as an on-site disposal system under this chapter if the system:
(1) is located on a tract of land of at least 100 acres in size;
(2) produces not more than 5,000 gallons a day on an annual average basis;
(3) is used only on a seasonal or intermittent basis; and
(4) is used only for disposal of sewage produced on the tract of land on which any part of the system is located.