The emission of a waste gas steam from an ethylene producing plant, or source utilizing ethylene as a raw material, into the atmosphere in excess of twenty (20) pounds per twenty-four (24) hour period shall be prohibited, unless the waste gas stream is properly burned at one thousand three hundred degrees Fahrenheit (1,300º F.) for three tenths (0.3) of a second or longer in a direct-flame after burner, or is removed by a method of comparable efficiency approved by the Mayor.
D.C. Mun. Regs. tit. 20, r. 20-712