R 336.1115 Definitions; O.

Rule 115. As used in these rules: (a) "Opacity" means the degree to which an emission reduces the transmission of light or obscures an observer's view. (b) "Open burning" means a fire from which the products of combustion are emitted directly into the outer air without passing through a stack or chimney. (c) "Open top vapor degreaser" means a tank that contains organic solvent that is heated to its boiling point for the purpose of cleaning or degreasing metallic objects through the condensation of the hot solvent vapor on the colder object. (d) "Oral reference dose" or "RfD" means a conservative estimate of the daily exposure to the human population, including sensitive subgroups, that is likely to be without appreciable risk of deleterious noncancerous effect during a lifetime. The reference dose is expressed in units of milligrams per kilogram of body weight per day. (e) "Organic compound" means any compound of carbon or mixture of such compounds, excluding all of the following: (i) Carbon monoxide. (ii) Carbon dioxide. (iii) Carbonic acid. (iv) Metallic carbides or carbonates. (v) Boron carbide. (vi) Silicon carbide. (vii) Ammonium carbonate. (viii) Ammonium bicarbonate. (ix) Methane. (x) Ethane. (f) "Organic compound-water separator" means any vessel, device, or piece of equipment that is operated for the recovery of organic compounds from waste water and which, in any 1 day, recovers more than 200 gallons of organic compounds from any equipment that processes, refines, stores, or handles such compounds with a Reid vapor pressure of more than 0.5 psia. (g) "Organic resin" means a solid or semisolid, water insoluble, organic material as listed in standard industrial classification code 2821. The resin has little or no tendency to crystallize and is used as the basic component of plastics or as a component of surface coating formulations. (h) "Organic solvent" means any volatile organic compound that is used as a diluent, thinner, dissolver, viscosity reducer, or cleaning agent or for other similar uses. (i) "Outer air" means air in all space outside of buildings, stacks, or exterior ducts.