(1) Unless exempted by the local authority, a person submitting an application for the construction of a septic tank and appurtenant disposal works shall arrange for percolation tests in accordance with C.A.S. No. CA1 to be carried out during the months of February or March.

(2) The provision of effluent disposal systems shall be determined in accordance with C.A.S. No. CA1 on the basis of these tests.

(3) Approval will only be given for the use of any septic tank where the suitability of any septic tank where the suitability of soil for tank effluent disposal systems has been proved, or where an alternative effluent system to the satisfaction of the local authority is provided.