(a)

1. (1) A wastewater treatment plant shall be classified as industrial if it is a privately owned wastewater treatment plant for treating liquid wastes, resulting from:

   1. (A) Any process of:

(i) Industry;

1. (ii) Manufacture;

   1. (iii) Trade; or

      1. (iv) Business; or
   2. (B) The development of any natural resources.
2. (2) A facility shall be classified as industrial if no significant part of the wastewater is classified as municipal or domestic wastewater.

(b) The distinction between basic and advanced industrial wastewater treatment plants will be classified according to the following:

1. (1) Basic industrial wastewater treatment plants will consist of:

   1. (A) Carwashes;
   2. (B) Sedimentation;
   3. (C) Oil and grease separation;
   4. (D) pH adjustment;
   5. (E) Aeration ponds; or
   6. (F) Similar basic wastewater treatment processes; and

2. (2) Advanced industrial wastewater treatment plants will consist of activated sludge, treatment of metal finishing waste streams, sedimentation/clarification with:

   1. (A) Chemicals;
   2. (B) Dissolved air flotation; or

   3. (C) Similar advanced wastewater treatment processes.

      1. (c)
3. (1) If circumstances warrant and the Division of Environmental Quality receives a written request so justifying, a classification may be adjusted by the Director of the Division of Environmental Quality to serve the intent of this part as long as it ensures environmental protection.
4. (2) Permit modifications will be required to effect such a change.