40 CFR § 419.11 - Specialized definitions.
For the purpose of this subpart:
(b) The term runoff shall mean the flow of storm water resulting from precipitation coming into contact with petroleum refinery property.
(e) The term once-through cooling water shall mean those waters discharged that are used for the purpose of heat removal and that do not come into direct contact with any raw material, intermediate, or finished product.
(g) The term contaminated runoff shall mean runoff which comes into contact with any raw material, intermediate product, finished product, by-product or waste product located on petroleum refinery property.