(a) The discharge of motor gasoline and compensating effluent must not contain oil in quantities that:

(1) Cause a film or sheen upon or discoloration of the surface of the water or adjoining shorelines; or

(2) Cause a sludge or emulsion to be deposited beneath the surface of the water or upon adjoining shorelines; or

(3) Contain an oil content above 15 ppm as measured by EPA Method 1664a (as defined at 40 CFR136.3) or other appropriate method for determination of oil content as accepted by the International Maritime Organization (IMO) (e.g., ISO Method 9377) or U.S. Coast Guard; or

(4) Otherwise are harmful to the public health or welfare of the United States.

(b) The discharge of motor gasoline and compensating effluent must be minimized in port. If an oily sheen is observed, any spill or overflow of oil must be cleaned up, recorded, and reported to the National Response Center immediately.

(c) The discharge of motor gasoline and compensating effluent is prohibited in federally-protected waters.