SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

RULE 476 - STEAM GENERATING EQUIPMENT
(Adopted May 7, 1976)(Amended October 8, 1976)

(a) A person shall not discharge into the atmosphere from any equipment having a maximum heat input rate of more than 12.5 million kilogram calories (50 million BTU) per hour used to produce steam, for which a permit to build, erect, install or expand is required after May 7, 1976, air contaminants that exceed the following:

  1. Oxides of nitrogen, expressed as nitrogen dioxide (NO2), calculated at three percent oxygen on a dry basis averaged over a minimum of 15 minutes, as shown in the following table:

    Fuel

    Gas

    Liquid or Solid

    Concentration

    125 ppm NOx

    225 ppm NOx

    When more than one type of fuel is used, the allowable concentration shall be determined by proportioning the gross heat input and allowable concentration of each fuel.

  2. Combustion contaminants that exceed both of the following two limits:

    (A) 5 kilograms (11 pounds) per hour.

    (B) 23 milligrams per cubic meter (0.01 gr/SCF) calculated at three percent oxygen on a dry basis averaged over a minimum of 15 consecutive minutes.

(b) Nothing in this rule shall be construed as preventing the maintenance or preventing the alteration or modification of existing steam generating equipment which will not increase the mass rate of air contaminant emissions.