(1) "Best available control technology" (BACT) means those techniques and methods of controlling emission of pollutants from an existing or proposed open burning source which limit those emissions to the maximum degree which the department determines, on a case-by-case basis, is achievable for that source, taking into account impacts on energy use, the environment, and the economy, and any other costs, including cost to the source.
(a) Such techniques and methods may include the following:
(i) scheduling of burning during periods and seasons of good ventilation;
(ii) applying dispersion forecasts;
(iii) utilizing predictive modeling results performed by and available from the department to minimize smoke impacts;
(iv) limiting the amount of burning to be performed during any one time;
(v) using ignition and burning techniques which minimize smoke production;
(vi) selecting fuel preparation methods that will minimize dirt and moisture content;
(vii) promoting fuel configurations which create an adequate air to fuel ratio;
(viii) prioritizing burns as to air quality impact and assigning control techniques accordingly;
(ix) promoting alternative treatments and uses of materials to be burned; and
(x) selecting sites that will minimize smoke impacts.
(b) For essential agricultural open burning, prescribed wildland open burning, conditional air quality open burning, commercial film production open burning, Christmas tree waste open burning, or any other minor open burning during September, October, or November, BACT includes burning only during the time periods specified by the department, which may be determined by calling the department at (800) 225-6779.
(c) For essential agricultural open burning, prescribed wildland open burning, conditional air quality open burning, commercial film production open burning, Christmas tree waste open burning, or any other minor open burning during December, January, or February, BACT includes burning only during the time periods specified by the department, which may be determined by calling the department at (800) 225-6779.
(2) "Christmas tree waste" means wood waste from commercially grown Christmas trees left in the field where the trees were grown, after harvesting and on-site processing.
(3) "Eastern Montana open burning zone" means the following counties or portions of counties: Big Horn, Blaine, Carbon, Carter, Cascade, Chouteau, Custer, Daniels, Dawson, Fallon, Fergus, Garfield, Glacier, Golden Valley, Hill, Judith Basin, Liberty, McCone, Meagher, Musselshell, Park (that portion north of Interstate 90), Petroleum, Phillips, Pondera, Powder River, Prairie, Richland, Roosevelt, Rosebud, Sheridan, Stillwater, Sweet Grass, Teton, Toole, Treasure, Valley, Wheatland, Wibaux and Yellowstone.
(4) "Essential agricultural open burning" means any open burning conducted on a farm or ranch to:
(a) eliminate excess vegetative matter from an irrigation ditch when no reasonable alternative method of disposal is available;
(b) eliminate excess vegetative matter from cultivated fields after harvest has been completed when no reasonable alternative method of disposal is available;
(c) improve range conditions when no reasonable alternative method is available; or
(d) improve wildlife habitat when no reasonable alternative method is available.
(5) "Major open burning source" means any person, agency, institution, business, or industry conducting any open burning that, on a statewide basis, will emit more than 500 tons per calendar year of carbon monoxide or 50 tons per calendar year of any other pollutant regulated under this chapter, except hydrocarbons.
(6) "Minor open burning source" means any person, agency, institution, business, or industry conducting any open burning that is not a major open burning source.
(7) "Open burning" means combustion of any material directly in the open air without a receptacle, or in a receptacle other than a furnace, multiple chambered incinerator, or wood waste burner, with the exception of detonation of unexploded ordnance, small recreational fires, construction site heating devices used to warm workers, or safety flares used to combust or dispose of hazardous or toxic gases at industrial facilities, such as refineries, gas sweetening plants, oil and gas wells, sulfur recovery plants, or elemental phosphorus plants.
(8) "Prescribed wildland open burning" means any planned open burning, either deliberately or naturally ignited, that is conducted on forest land or relatively undeveloped rangeland to:
(a) improve wildlife habitat;
(b) improve range conditions;
(c) promote forest regeneration;
(d) reduce fire hazards resulting from forestry practices, including reduction of log deck debris when the log deck is close to a timber harvest site;
(e) control forest pests and diseases; or
(f) promote any other accepted silvicultural practices.
(9) "Salvage operation" means any operation conducted in whole or in part to salvage or reclaim any product or material, except the silvicultural practice commonly referred to as a salvage cut.
(10) "Trade wastes" means solid, liquid, or gaseous material resulting from construction or operation of any business, trade, industry, or demolition project. Wood product industry wastes such as sawdust, bark, peelings, chips, shavings, and cull wood are considered trade wastes. Trade wastes do not include wastes generally disposed of by essential agricultural open burning, prescribed wildland open burning, or Christmas tree waste, as defined in this rule.
(11) "Wood waste burner" means a device commonly called a tepee burner, silo, truncated cone, wigwam burner, or other similar burner commonly used by the wood products industry to dispose of wood.