(a) Welldeck discharges that contain graywater from smaller vessels are prohibited.

(b) Welldeck discharges containing washdown from gas turbine engines are prohibited within three miles of the United States and to the greatest extent practicable must be discharged seaward of waters subject to UNDS.

(c) Welldeck discharges from equipment and vehicle washdowns must not contain garbage and 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 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.