Small boilers and heaters burning used oil that has not been mixed with hazardous waste are permitted by rule provided that all of the following conditions are met:
  (1) the combustion unit or combination of combustion units at the same account have a maximum capacity of 1.0 million Btu per hour (MMBtu/hr) and each individual combustion unit is not greater than 0.5 MMBtu/hr;
  (2) the combustion gases from the combustion unit(s) are vented to the ambient air in accordance with the following requirements:
    (A) through an unobstructed vent; or
    (B) through a vertical vent with a cap; and
      (i) a flat roof, through a minimum of a three-foot stack; or
      (ii) a sloped roof, through a stack that is at least three feet higher than the highest point on the roof or three feet higher than a point extending ten feet horizontally from the roof; and
  (3) the combustion unit(s) burns only used oil the owner or operator generates on-site or used oil received from household do-it-yourself used oil generators.

Source Note: The provisions of this §106.181 adopted to be effective December 27, 1996, 21 TexReg 12123; amended to be effective September 4, 2000, 25 TexReg 8653; amended to be effective November 1, 2001, 26 TexReg 8518