Rule 40D-40.301, F.A.C., sets forth conditions for issuance of general permits for minor surface water management systems. One of the conditions is that the area of impervious surface not exceed 2 acres. Historically, impervious and semi-impervious materials have been treated the same in District rules. However, recent rulemaking that included adoption of a separate definition of “semi-impervious” made the continued inclusion of semi-impervious materials in this condition unclear. Therefore, the condition is amended to provide that the area of impervious and semi-impervious surfaces shall not exceed 2 acres.