(a) The direct discharge of gas turbine water wash is prohibited.

(b) To the greatest extent practicable, gas turbine water wash must be collected separately and disposed of onshore in accordance with any applicable solid waste and hazardous substance management and disposal requirements.

(c) Notwithstanding the prohibition of direct discharges of gas turbine water wash overboard, if the gas turbine water wash is commingled with any other discharge for the purposes of treatment prior to discharge then under no circumstances may oils, including oily mixtures be discharged from that combined discharge 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.