(a) This section shall apply to the department's rules except for rules required for delegation of the national pollutant discharge elimination system permit program pursuant to the Federal Water Pollution Control Act, Section 402, Public Law 92-500, 33 U.S.C. 1342, as amended.

(b) The applicability of rules of the department, other than those issued under the Tennessee Air Quality Act, compiled in title 68, chapter 201, part 1, shall be as follows:

(1) A rule of the department in effect before April 12, 1979, shall apply to a feedlot, dairy farm or poultry production house with an established date of operation prior to April 12, 1979;

(2) A rule of the department shall apply to a feedlot, dairy farm or poultry production house with an established date of operation subsequent to the effective date of the rule;

(3) A rule of the department adopted after April 12, 1979, shall not apply to a feedlot, dairy farm or poultry production house holding any department permit and having an established date of operation prior to the effective date of the rule; and

(4) A rule of the department adopted after April 12, 1979, shall not apply to a feedlot, dairy farm or poultry production house not previously required to hold a department permit and having an established date of operation prior to the effective date of the rule.

(c) The applicability of rules promulgated under the “Tennessee Air Quality Act,” compiled in title 68, chapter 201, part 1, shall be as follows:

(1) A rule of the department or the air pollution control board in effect on April 12, 1979, shall apply to a feedlot, dairy farm or poultry production house with an established date of operation prior to April 12, 1979;

(2) A rule of the department or the air pollution control board shall apply to a feedlot, dairy farm or poultry production house with an established date of operation subsequent to the effective date of the rule; and

(3) A rule of the department or the air pollution control board pertaining to a feedlot, dairy farm or poultry production house adopted after April 12, 1979, shall not apply to any feedlot, dairy farm or poultry production house having an established date of operation prior to the effective date of the rule.