Section 58.01.01.317 - INSIGNIFICANT ACTIVITIES01.Applicability Criteria. This Section contains the criteria for identifying insignificant activities for the purposes of the Tier I operating permit program. Notwithstanding any other provision of this rule, no emission unit or activity subject to an applicable requirement qualifies as an insignificant emission unit or activity. Applicants may not exclude from Tier I operating permit applications information that is needed to determine whether the facility is major or whether the facility is in compliance with applicable requirements. (3-28-23)a. Presumptively insignificant emission units. (3-28-23)i. Except as provided above, the activities listed in this section may be omitted from the permit application. (3-28-23)(1) Blacksmith forges. (3-28-23)(2) Mobile transport tanks on vehicles except for those containing asphalt and not including loading and unloading operations. (3-28-23)(3) Natural gas pressure regulator vents, excluding venting at oil and gas production facilities. (3-28-23)(4) Storage tanks, reservoirs and pumping and handling equipment of any size, limited to soaps, lubricants, lubricating oil, treater oil, hydraulic fluid, vegetable oil, grease, animal fat, aqueous salt solutions or other materials and processes using appropriate lids and covers where there is no generation of objectionable odor or airborne particulate matter. (3-28-23)(5) Pressurized storage of oxygen, nitrogen, carbon dioxide, air, or inert gases. (3-28-23)(6) Storage of solid material, dust-free handling. (3-28-23)(7) Boiler water treatment operations, not including cooling towers. (3-28-23)(8) Vents from continuous emission monitors and other analyzers. (3-28-23)(9) Vents from rooms, buildings and enclosures that contain permitted emissions units or activities from which local ventilation, controls, and separate exhaust are provided. (3-28-23)(10) Internal combustion engines for propelling or powering a vehicle. (3-28-23)(11) Recreational fireplaces including the use of barbecues, campfires and ceremonial fires. (3-28-23)(12) Brazing, soldering, and welding equipment and cutting torches for use in cutting metal wherein components of the metal do not generate hazardous air pollutants or hazardous air pollutant precursors. (3-28-23)(13) Atmospheric generators used in connection with metal heat treating processes using non-hazardous air pollutant metals as the primary raw material. (3-28-23)(14) Non-hazardous air pollutant metal finishing or cleaning using tumblers. (3-28-23)(15) Drop hammers or hydraulic presses for forging or metalworking. (3-28-23)(16) Electrolytic deposition, used to deposit brass, bronze, copper, iron, tin, zinc, precious and other metals not listed as the parents of hazardous air pollutants. (3-28-23)(17) Equipment used for surface coating, painting, dipping or spraying operations, except those that will emit volatile organic compound or hazardous air pollutant. (3-28-23)(18) Process water filtration systems. (3-28-23)(19) Portable electrical generators that can be moved by hand from one (1) location to another. Moved by hand means that it can be moved without the assistance of any motorized or non-motorized vehicle, conveyance, or device. (3-28-23)(20) Plastic and resin curing equipment, excluding FRP and provided these activities are not related to the source's primary business activity. (3-28-23)(21) Extrusion equipment, metals, minerals, plastics, grain or wood used without solvents containing hazardous air pollutant. (3-28-23)(22) Presses and vacuum forming, for curing rubber and plastic products or for laminating plastics without solvents containing hazardous air pollutants present. (3-28-23)(23) Roller mills and calendars for use with rubber and plastics without solvents containing hazardous air pollutants. (3-28-23)(24) Conveying and storage of plastic pellets. (3-28-23)(25) Plastic compression, injection, and transfer molding and extrusion, rotocasting, pultrusion, blowmolding, excluding acrylics, PVC, polystyrene and related copolymers and the use of plasticizer. Only oxygen, carbon dioxide, nitrogen, air or inert gas allowed as blowing agent. (3-28-23)(26) Plastic pipe welding. (3-28-23)(27) Wax application in either a molten state or aqueous suspension. (3-28-23)(28) Plant maintenance and upkeep including routine housekeeping, janitorial activities, cleaning and preservation of equipment, preparation for and painting of structures or equipment, retarring roofs, applying insulation to buildings in accordance with applicable environmental and health and safety requirements and lawn, landscaping and groundskeeping activities. Provided these activities are not conducted as part of a manufacturing process, are not related to the source's primary business activity, and not otherwise triggering a permit modification. (3-28-23)(29) Agricultural activities on a facility's property that are not subject to registration or new source review by the permitting authority. (3-28-23)(30) Maintenance of paved streets and parking lots including paving, stripping, salting, sanding, cleaning and sweeping of streets and paved surfaces. Provided these activities are not related to the source's primary business activity, do not otherwise trigger a permit modification, and fugitive emissions are reasonably controlled as required in Section 808. (3-28-23)(31) Ultraviolet curing processes. (3-28-23)(32) Hot melt adhesive application with no volatile organic compounds or hazardous air pollutants in the adhesive formula. (3-28-23)(33) Laundering, dryers, extractors, tumblers for fabrics, using water solutions of bleach and/or detergents except for boilers. (3-28-23)(34) Steam cleaning operations. (3-28-23)(35) Steam sterilizers. (3-28-23)(36) Food service activities including cafeterias, kitchen facilities and barbecues located at a source for providing food service on premises. (3-28-23)(37) Portable drums and totes. (3-28-23)(38) Fluorescent light tube and aerosol can crushing in units designed to reduce emissions from these activities. (3-28-23)(39) Flares used to indicate danger to the public. (3-28-23)(40) General vehicle maintenance including vehicle exhaust from repair facilities provided these activities are not related to the source's primary business activity and do not have applicable requirements under title VI of the Clean Air Act. (3-28-23)(41) Comfort air conditioning or air-cooling systems, not used to remove air contaminants from specific equipment. (3-28-23)(42) Natural draft hoods, natural draft stacks, or natural draft ventilators for sanitary and storm drains, safety valves, and storage tanks subject to size and service limitations expressed elsewhere in this section. (3-28-23)(43) Natural and forced air vents for bathroom/toilet facilities. (3-28-23)(44) Office activities. (3-28-23)(45) Equipment used for quality control/assurance or inspection purposes, including sampling equipment used exclusively to withdraw materials for laboratory analyses and testing. (3-28-23)(46) Fire suppression systems and similar safety equipment and equipment used to train firefighters including fire drill pits. (3-28-23)(47) Materials and equipment used by, and activity related to operation of infirmary; infirmary is not the source's business activity except equipment subject to 40 CFR Part 61 for radionuclides. (3-28-23)(48) Satellite Accumulation Areas (SAAs) and Temporary Accumulation Areas (TAAs) managed in compliance with RCRA. (3-28-23)(49) Equipment for carving, cutting, routing, turning, drilling, machining, sawing, surface grinding, sanding, planing, buffing, shot blasting, sintering, or polishing: Ceramics, glass, leather, metals, plastics, rubber, concrete, paper stock, or wood provided that these activities are not conducted as part of a manufacturing process. (3-28-23)(50) Oxygen, nitrogen, or rare gas extraction and liquefaction equipment subject to other exemption limitation, e.g., internal and external combustion equipment. (3-28-23)(51) Slaughterhouses, such as rendering cookers, boilers, heating plants, incinerators, and electrical power generating equipment. (3-28-23)(52) Ozonation equipment. (3-28-23)(53) Temporary construction activities at a facility provided that the installation or modification of emissions units must comply with all applicable federal, state, and local rules and regulations. (3-28-23)(54) Batch loading and unloading of solid phase catalysts. (3-28-23)(55) Pulse capacitors. (3-28-23)(56) Gas cabinets using only gases that are not regulated air pollutants. (3-28-23)(57) CO2 lasers, used only on metals and other materials that do not emit hazardous air pollutants in the process. (3-28-23)(58) Structural changes not having air contaminant emissions. (3-28-23)(59) Equipment used to mix, package, store and handle soaps, lubricants, vegetable oil, grease, animal fat, and non-volatile aqueous salt solutions, provided appropriate lids and covers are utilized. (3-28-23)(60) Photographic process equipment by which an image is reproduced upon material sensitized to radiant energy, e.g., blueprint activity, photocopiers, mimeograph, telefax, photographic developing, and microfiche provided these activities are not related to the source's primary business activity. (3-28-23)(61) Pharmaceutical and cosmetics packaging equipment. (3-28-23)(62) Paper trimmers/binders provided these activities are not related to the source's primary business activity. (3-28-23)(63) Bench-scale laboratory equipment and laboratory equipment used exclusively for physical or chemical analysis, including associated vacuum producing devices but excluding research and development facilities. (3-28-23)(64) Repair and maintenance shop activities not related to the source's primary business activity. (3-28-23)(65) Handling equipment and associated activities for glass and aluminum which is destined for recycling, provided these activities are not related to the source's primary business activity. (3-28-23)(66) Hydraulic and hydrostatic testing equipment. (3-28-23)(67) Batteries and battery charging stations, except at battery manufacturing plants. (3-28-23)(68) Porcelain and vitreous enameling equipment. (3-28-23)(69) Solid waste containers. (3-28-23)(70) Salt baths using nonvolatile salts that do not result in emissions of any regulated air pollutants. (3-28-23)(71) Shock chambers. (3-28-23)(72) Wire strippers. (3-28-23)(73) Humidity chambers. (3-28-23)(74) Solar simulators. (3-28-23)(75) Environmental chambers not using hazardous air pollutant gases. (3-28-23)(76) Totally enclosed conveyors not including transfer points. (3-28-23)(77) Steam vents and safety relief valves. (3-28-23)(78) Air compressors, pneumatically operated equipment, systems, and hand tools. (3-28-23)(79) Steam leaks. (3-28-23)(80) Boiler blow-down tank. (3-28-23)(81) Salt cake mix tanks at pulp mills. (3-28-23)(82) Digester chip feeders at pulp mills. (3-28-23)(83) Weak liquor and filter tanks at pulp mills. (3-28-23)(84) Process water and white water storage tanks at pulp mills. (3-28-23)(85) Demineralizer water tanks, demineralization, demineralizer vents, and oxygen scavenging (deaeration) of water. (3-28-23)(86) Clean condensate tanks. (3-28-23)(87) Alum tanks. (3-28-23)(88) Broke beaters, repulpers, pulp and repulping tanks, stock chests and pulp handling. (3-28-23)(89) Lime and mud filtrate tanks. (3-28-23)(90) Hydrogen peroxide tanks. (3-28-23)(91) Lime mud washer. (3-28-23)(92) Lime mud filter. (3-28-23)(93) Hydro and liquor clarifiers or filters and storage tanks and associated pumping, piping, and handling. (3-28-23)(94) Lime grits washers, filters, and handing. (3-28-23)(95) Lime silos and feed bins. (3-28-23)(96) Paper forming. (3-28-23)(97) Starch cooking. (3-28-23)(98) Pulp stock cleaning and screening. (3-28-23)(99) Paper winders or other paper converting equipment. (3-28-23)(100) Sludge dewatering and wet sludge handling. (3-28-23)(101) Screw press vents. (3-28-23)(102) Pond dredging. (3-28-23)(103) Polymer tanks and storage devices and associated pumping and handling equipment, used for solids dewatering and flocculation. (3-28-23)(104) Non-PCB oil filled circuit breakers, oil filled transformers and other equipment that is analogous to, but not considered to be, a tank. (3-28-23)(105) Lab-scale electric or steam-heated drying ovens and autoclaves. (3-28-23)(106) Sewer manholes, junction boxes, sumps and lift stations associated with wastewater treatment systems. (3-28-23)(107) Water cooling towers processing exclusively noncontact cooling water. (3-28-23)(108) Paper coating and sizing. (3-28-23)(109) Process wastewater and ponds. (3-28-23)(110) Outdoor firearms practice ranges. (3-28-23)b. Insignificant activities on the basis of size or production rate. (3-28-23)i. Units and activities listed in this section must be listed in the permit application. The following units and activities are determined to be insignificant based on their size or production rate: (3-28-23)(1) Operation, loading and unloading of storage tanks and storage vessels, with lids or other appropriate closure and less than two hundred sixty (260) gallon capacity thirty five cubic feet (35cft), heated only to the minimum extend to avoid solidification if necessary. (3-28-23)(2) Operation, loading and unloading of storage tanks, not greater than one thousand one hundred (1,100) gallon capacity, with lids or other appropriate closure, not for use with hazardous air pollutants, maximum (max.) vp five-hundred fifty (550) mm Hg. (3-28-23)(3) Operation, loading and unloading of volatile organic compound storage tanks, ten thousand (10,000) gallons capacity or less, with lids or other appropriate closure, vp not greater than eighty (80) mm Hg at twenty-one (21) degrees C. Operation, loading and unloading of gasoline storage tanks, ten thousand (10,000) gallons capacity or less, with lids or other appropriate closure. (3-28-23)(4) Operation, loading and unloading storage of butane, propane, or liquefied petroleum gas (LPG), storage tanks, vessel capacity under forty thousand (40,000) gallons. (3-28-23)(5) Combustion source, less than five million (5,000,000) Btu/hr, exclusively using natural gas, butane, propane, and/or LPG. (3-28-23)(6) Combustion source, less than five hundred thousand (500,000) Btu/hr, using any commercial fuel containing less than four-tenths percent (.4%) by weight sulfur for coal or less than one percent (1%) by weight sulfur for other fuels. (3-28-23)(7) Combustion source, of less than one million (1,000,000) Btu/hr, if using kerosene, No. 1 or No. 2 fuel oil. (3-28-23)(8) Combustion source, not greater than five hundred thousand (500,000) Btu/hr, if burning waste wood, wood waste or waste paper. (3-28-23)(9) Welding using not more than one (1) ton per day of welding rod. (3-28-23)(10) Foundry sand molds, unheated and using binders with less than twenty-five hundredths percent (.25%) free phenol by sand weight. (3-28-23)(11) "Parylene" coaters using less than five hundred (500) gallons of coating per year. (3-28-23)(12) Printing and silkscreening, using less than two (2) gallon/day of any combination of the following: Inks, coatings, adhesives, fountain solutions, thinners, retarders, or nonaqueous cleaning solutions. (3-28-23)(13) Water cooling towers and ponds, not using chromium-based corrosion inhibitors, not used with barometric jets or condensers, not greater than ten thousand (10,000) gpm, not in direct contact with gaseous or liquid process streams containing regulated air pollutants. (3-28-23)(14) Combustion turbines, of less than five hundred (500) HP. (3-28-23)(15) Batch solvent distillation, not greater than fifty-five (55) gallons batch capacity. (3-28-23)(16) Municipal and industrial water chlorination facilities of not greater than twenty million (20,000,000) gallons per day capacity. The exemption does not apply to wastewater treatment. (3-28-23)(17) Surface coating, using less than two (2) gallons per day. (3-28-23)(18) Space heaters and hot water heaters using natural gas, propane or kerosene and generating less than five million (5,000,000) Btu/hr. (3-28-23)(19) Tanks, vessels, and pumping equipment, with lids or other appropriate closure for storage or dispensing of aqueous solutions of inorganic salts, bases and acids excluding: (3-28-23)(a) Ninety-nine percent (99%) or greater H2SO4 or H3PO4. (3-28-23)(b) Seventy percent (70%) or greater HNO3. (3-28-23)(c) Thirty percent (30%) or greater HC1. (3-28-23)(d) More than one (1) liquid phase where the top phase is more than one percent (1%) volatile organic compounds. (3-28-23)(20) Equipment used exclusively to pump, load, unload, or store high boiling point organic material, material with initial boiling point (IBP) not less than one hundred fifty (150) degrees C or vapor pressure (vp) not more than five (5) mm Hg at twenty-one (21) degrees C with lids or other appropriate closure. (3-28-23)(21) Smokehouses under twenty (20) square feet. (3-28-23)(22) Milling and grinding activities, using paste-form compounds with less than one percent (1%) volatile organic compounds. (3-28-23)(23) Rolling, forging, drawing, stamping, shearing, or spinning hot or cold metals. (3-28-23)(24) Dip-coating operations, using materials with less than one percent (1%) volatile organic compounds. (3-28-23)(25) Surface coating, aqueous solution or suspension containing less than one percent (1%) volatile organic compounds. (3-28-23)(26) Cleaning and stripping activities and equipment, using solutions having less than one percent (1%) volatile organic compounds by weight. On metallic substrates, acid solutions are not considered for listing as insignificant. (3-28-23)(27) Storage and handling of water-based lubricants for metal working where the organic content of the lubricant is less than ten percent (10%). (3-28-23)(28) Municipal and industrial wastewater chlorination facilities of not greater than one million (1,000,000) gallons per day capacity. (3-28-23)(29) Domestic sewage treatment ponds with average flowrates less than four hundred (400) gpm or treating waste from less than three thousand (3000) people from non-residential sources. (3-28-23)(30) An emission unit or activity with potential emissions less than or equal to the significant emission rate as defined in Section 006 and actual emissions less than or equal to ten percent (10%) of the levels contained in Section 006 of the definition of significant and no more than one (1) ton per year of any hazardous air pollutant. (3-28-23)Idaho Admin. Code r. 58.01.01.317