(a) Oil, grease, or petrochemical substances shall not be present in receiving waters to the extent that they produce globules, other residue, or any visible, colored film on the surface; coat the banks and/or bottoms of the waterbodies; or adversely affect any of the aquatic biota.
(b) Oil and grease shall be an average of no more than ten milligrams per liter (10 mg/L) or a maximum of no more than fifteen milligrams per liter (15 mg/L).
(c) No mixing zones are allowed for discharges of oil and grease.