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This redline strikeout document represents the chan ges to the regulatory text to 40 CFR subpart GG, National Emis sion Standards for Aerospace Manufacturing and Rework Fa cilities, in the final rule action: National Emission Standards for Aerospace Manufacturing and Rework Facilities Risk and Techno logy Review, signed by the EPA Administrator Gina McCarthy on No vember 19, 2015.

Subpart GG—National Emission Standards for Aerospac e Manufacturing

and Rework Facilities §63.741 Applicability and designation of affected s ources. (a) This subpart applies to facilities that are eng aged, either in part or in whole, in the manufacture or r ework of commercial, civil, or military aerospace vehicles o r components and that are major sources as defined in §63.2. (b) The owner or operator of an affected source sha ll comply with the requirements of this subpart and of subpart A of this part, except as specified in §63.743(a) and Ta ble 1 of this subpart. (c) Affected sources. The affected sources to which the provisions of this subpart apply are specified in p aragraphs (c)(1) through ( c)(8 ) of this section. The activities subject to this subpart are limited to the manufacture or rewo rk of aerospace vehicles or components as defined in this subpart. Where a dispute arises relating to the applicabilit y of this subpart to a specific activity, the owner or operat or shall Deleted: 7Page 2 of 182

demonstrate whether or not the activity is regulate d under this subpart. (1) Each cleaning operation as follows: (i) All hand-wipe cleaning operations constitute an

affected source. (ii) Each spray gun cleaning operation constitutes an affected source. (iii) All flush cleaning operations constitute an a ffected

source. (2) For organic HAP or VOC emissions, each primer application operation, which is the total of all pr imer applications at the facility. (3) For organic HAP or VOC emissions, each topcoat application operation, which is the total of all to pcoat applications at the facility. (4) For organic HAP or VOC emissions, each specialty coating application operation, which is the total o f all specialty coating applications at the facility. (5) For organic HAP or VOC emissions, each depainting operation, which is the total of all depainting at the facility. ( 6 ) Each chemical milling maskant application operati on, which is the total of all chemical milling maskant applications at the facility. Deleted: 5Page 3 of 182

( 7 ) Each waste storage and handling operation, which is the total of all waste handling and storage at the faci lity. ( 8 ) For inorganic HAP emissions, each spray booth , portable enclosure, or hangar that contains a primer , topcoat , or specialty coating application operation subject to § 63.745(g ), or a depainting operation subject to § 63.746(b)(4)

. (d) An owner or operator of an affected source subj ect to this subpart shall obtain an operating permit from the permitting authority in the State in which the sour ce is located. The owner or operator shall apply for and obtain such permit in accordance with the regulations contained in part 70 of this chapter and in applicable State regulations

. (e) [Reserved] (f) This subpart does not regulate research and development, quality control, and laboratory testin g activities, chemical milling, metal finishing, electrodepositio n (except for electrodeposition of paints), composites processing (except for cleaning and coating of composite parts or componen ts that become part of an aerospace vehicle or component as well as composite tooling that comes in contact with such c omposite parts or components prior to cure), electronic part s and assemblies (except for cleaning and topcoating of c ompleted assemblies), manufacture of aircraft transparencies , and wastewater operations at aerospace facilities. Thes e Deleted: 6

Deleted: 7

Deleted: or

Deleted: )

Deleted: (e) All wastes that are determined to be hazardous wastes under the Resource Conservation and Recovery Act of 1976 (PL 94-580) (RCRA) as implemented by 40 CFR parts 260 and 261, and that are subject to RCRA requirements as implemented in 40 CFR parts 262 through 268, are exempt from the requirements of this subpart.¶ (f) This subpart does not contain control requireme nts for use of specialty coatings, adhesives, adhesive bonding primers, or sealants at aerospace facilitie s. It alsoPage 4 of 182

requirements do not apply to the rework of aircraft or aircraft components if the holder of the Federal Aviation Ad ministration (FAA) design approval, or the holder's licensee, is not actively manufacturing the aircraft or aircraft components. These requirements also do not apply to parts and assembl ies not critical to the vehicle's structural integrity or f light performance. The requirements of this subpart do no t apply to primers, topcoats, specialty coatings, chemical milling maskants, strippers, and cleaning solvents that meet the definition of non- HAP material , as determined from manufacturer's representations , such as in a material safety data sheet or product data sheet, or testing, excep t that if an owner or operator chooses to include one or more no n-HAP primer, topcoat, specialty coating, or chemical milling mas kant in averaging under § 63.743(d), then the recordkeeping requirements of § 63.752(c)(4) shall apply. The requirements of this subpart also do not apply to primers, topcoats, and special ty coatings that meet the definition of “classified national se curity information” in § 63.742 . Additional specific exemptions from regulatory coverage are set forth in paragraphs (e) , (g), (h), (i) and (j) of this section and §§ 63.742, 63.744(a )(1), (b), (e), 63.745(a), (f)(3), (g)(4), 63.746(a), (b)(5), 63.747(c)(3), and 63.749(d). Deleted: also

Deleted: containing

Deleted: and VOC at concentrations less than 0.1 percent for carcinogens or 1.0 percent for noncarcinogensPage 5 of 182

(g) The requirements for primers, topcoats, specialty coatings, and chemical milling maskants in §§ 63.745 and 63.747 do not apply to the use of low-volume coatings in t hese categories for which the annual total of each separ ate formulation used at a facility does not exceed 189 l (50 gal), and the combined annual total of all such primers, topcoats, specialty coatings, and chemical milling maskants used at a facility does not exceed 757 l (200 gal). Primers , topcoats , and specialty coatings exempted under paragraph (f) of this section and under § 63.745(f)(3) and (g)(4) are not include d in the 50 and 200 gal limits. Chemical milling maskants exemp ted under § 63.747(c)(3) are also not included in these limits. (h) Regulated activities associated with space vehi cles designed to travel beyond the limit of the earth's atmosphere, including but not limited to satellites, space stat ions, and the Space Shuttle System (including orbiter, external t anks, and solid rocket boosters), are exempt from the require ments of this subpart, except for depainting operations found in §63.746. (i) Any waterborne coating for which the manufactur er's supplied data demonstrate that organic HAP and VOC contents are less than or equal to the organic HAP and VOC conte nt limits for its coating type, as specified in §§63.745(c) and 6 3.747(c), is exempt from the following requirements of this subp art: §§63.745(d) and (e), 63.747(d) and (e), 63.749(d) a nd (h), Deleted: § Deleted: §

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63.750 (c) through (h) and (k) through (n), 63.752 (c) and (f), and 63.753 (c) and (e). A facility shall maintain t he manufacturer's supplied data and annual purchase re cords for each exempt waterborne coating readily available fo r inspection and review and shall retain these data for 5 years. (j) Regulated activities associated with the rework of antique aerospace vehicles or components are exempt from the requirements of this subpart. § 63.742 Definitions. Terms used in this subpart are defined in the Act, in subpart A of this part, or in this section as follo ws: Aerospace facility means any facility that produces , reworks, or repairs in any amount any commercial, c ivil, or military aerospace vehicle or component. Aerospace vehicle or component means any fabricated part, processed part, assembly of parts, or completed uni t, with the exception of electronic components, of any aircraft including but not limited to airplanes, helicopters, missiles , rockets, and space vehicles. Aircraft fluid systems means those systems that han dle hydraulic fluids, fuel, cooling fluids, or oils. Aircraft transparency means the aircraft windshield , canopy, passenger windows, lenses, and other compon ents which are constructed of transparent materials.Page 7 of 182

Airless and air-assisted airless spray mean any coa ting spray application technology that relies solely on the fluid pressure of the coating to create an atomized coati ng spray pattern and does not apply any atomizing compressed air to the coating before it leaves the spray gun nozzle. Air- assisted airless spray uses compressed air to shape and dist ribute the fan of atomized coating, but still uses fluid press ure to create the atomized coating. Antique aerospace vehicle or component means an air craft or component thereof that was built at least 30 years ago. An antique aerospace vehicle would not routinely be in commercial or military service in the capacity for which it wa s designed.

Carbon adsorber means one vessel in a series of ves sels in a carbon adsorption system that contains carbon and is used to remove gaseous pollutants from a gaseous emission s ource. Carbon Adsorber control efficiency means the total efficiency of the control system, determined by the product of the capture efficiency and the control device effic iency. Chemical milling maskant means a coating that is ap plied directly to aluminum components to protect surface areas when chemical milling the component with a Type I or Typ e II etchant. Type I chemical milling maskants are used with a Ty pe I etchant and Type II chemical milling maskants are used with a Type II etchant. This definition does not include bonding m askants,Page 8 of 182

critical use and line sealer maskants, and seal coa t maskants. Additionally, maskants that must be used with a com bination of Type I or II etchants and any of the above types of maskants (i.e., bonding, critical use and line sealer, and s eal coat) are

also not included in this definition . (See also Type I and Type II etchant definitions.) Chemical milling maskant application operation mean s application of chemical milling maskant for use wit h Type I or Type II chemical milling etchants. Classified National Security Information means info rmation that has been determined pursuant to Executive Orde r 13526, “Classified National Security Information,” Decembe r 29, 2009 or any successor order to require protection against u nauthorized disclosure and is marked to indicate its classified status when in documentary form. The term “Classified Informati on” is an alternative term that may be used instead of “Class ified National Security Information.” Cleaning operation means collectively spray gun, ha nd-wipe, and flush cleaning operations. Cleaning solvent means a liquid material used for h andwipe, spray gun, or flush cleaning. This definition does not include solutions that contain HAP and VOC below th e de minimis levels specified in §63.741(f). Deleted: exempt from Deleted: subpartPage 9 of 182

Closed-cycle depainting system means a dust-free, a utomated process that removes permanent coating in small sec tions at a

time and maintains a continuous vacuum around the a rea(s) being depainted to capture emissions. Coating means a material that is applied to a subst rate for decorative, protective, or functional purposes. Suc h materials include, but are not limited to, paints, sealants, liquid plastic coatings, caulks, inks, adhesives, and mask ants. Decorative, protective, or functional materials tha t consist only of protective oils for metal, acids, bases, or any combination of these substances; paper film or plas tic film which may be pre-coated with an adhesive by the fil m manufacturer; or pre-impregnated composite sheets a re not considered coatings for the purposes of this subpar t. Materials in handheld non-refillable aerosol containers, touc h-up markers, and marking pens are also not considered coatings f or the purposes of this subpart. A liquid plastic coating means a coating made from fine particle-size polyvinyl chlo ride (PVC) in solution (also referred to as a plastisol). Coating operation means the use of a spray booth, t ank, or other enclosure or any area, such as a hangar, for the application of a single type of coating (e.g., prim er); the use of the same spray booth for the application of anot her type of Deleted: Coating means a material that is applied to the surface of an aerospace vehicle or component to form a decorative, protective, or functional solid film, or the solid film itself.¶Page 10 of 182

coating (e.g., topcoat) constitutes a separate coat ing operation for which compliance determinations are performed s eparately. Coating unit means a series of one or more coating applicators and any associated drying area and/or o ven wherein a coating is applied, dried, and/or cured. A coating unit ends at the point where the coating is dried or cured, or p rior to any subsequent application of a different coating. It i s not necessary to have an oven or flashoff area in order to be included in this definition. Confined space means a space that: (1) Is large eno ugh and so configured that an employee can bodily enter and perform assigned work; (2) has limited or restricted means for entry or exit (for example, fuel tanks, fuel vessels, and ot her spaces that have limited means of entry); and (3) is not s uitable for continuous employee occupancy. Control device means destruction and/or recovery eq uipment used to destroy or recover HAP or VOC emissions gen erated by a regulated operation. Control system means a combination of pollutant cap ture system(s) and control device(s) used to reduce disc harge to the atmosphere of HAP or VOC emissions generated by a r egulated operation. Depainting means the removal of a permanent coating from the outer surface of an aerospace vehicle or compon ent, whetherPage 11 of 182

by chemical or non-chemical means. For non-chemical means, this definition excludes hand and mechanical sanding, an d any other non-chemical removal processes that do not involve blast media or other mechanisms that would result in airborne p article movement at high velocity. Depainting operation means the use of a chemical ag ent, media blasting, or any other technique to remove pe rmanent coatings from the outer surface of an aerospace veh icle or components. The depainting operation includes washi ng of the aerospace vehicle or component to remove residual s tripper, media, or coating residue. Electrodeposition of paint means the application of a coating using a water-based electrochemical bath pr ocess. The component being coated is immersed in a bath of the coating. An electric potential is applied between the component and an oppositely charged electrode hanging in the bath. T he electric potential causes the ionized coating to be electric ally attracted, migrated, and deposited on the component being

coated. Electrostatic spray means a method of applying a sp ray coating in which an electrical charge is applied to the coating and the substrate is grounded. The coating is attra cted to the substrate by the electrostatic potential between th em.Page 12 of 182

Exempt solvent means specified organic compounds th at have been determined by the EPA to have negligible photo chemical reactivity and are listed in 40 CFR 51.100. Exterior primer means the first layer and any subse quent layers of identically formulated coating applied to the exterior surface of an aerospace vehicle or component where the component is used on the exterior of the aerospace vehicle. E xterior primers are typically used for corrosion prevention , protection from the environment, functional fluid resistance, and adhesion of subsequent exterior topcoats. Coatings that are defined as specialty coatings are not included under this defi nition. Flush cleaning means the removal of contaminants su ch as dirt, grease, oil, and coatings from an aerospace v ehicle or component or coating equipment by passing solvent o ver, into, or through the item being cleaned. The solvent may sim ply be poured into the item being cleaned and then drained, or be assisted by air or hydraulic pressure, or by pumping. Hand-wipe cleaning operations where wiping, scrubbing, mopping, or oth er hand action are used are not included. General aviation (GA) means that segment of civil a viation that encompasses all facets of aviation except air carriers, commuters, and military. General aviation includes charter and corporate-executive transportation, instruction, re ntal, aerialPage 13 of 182

application, aerial observation, business, pleasure , and other special uses. General aviation rework facility means any aerospac e facility with the majority of its revenues resultin g from the reconstruction, repair, maintenance, repainting, co nversion, or alteration of general aviation aerospace vehicles o r components. Hand-wipe cleaning operation means the removal of contaminants such as dirt, grease, oil, and coating s from an aerospace vehicle or component by physically rubbin g it with a material such as a rag, paper, or cotton swab that has been moistened with a cleaning solvent. Hazardous air pollutant (HAP) means any air polluta nt listed in or pursuant to section 112(b) of the Act. High efficiency particulate air (HEPA) filter means a filter that has a 99.97 percent reduction efficienc y for 0.3 micron aerosol. High volume low pressure (HVLP) spray equipment mea ns spray equipment that is used to apply coating by means of a spray gun that operates at 10.0 psig of atomizing air pressur e or less at the air cap. Inorganic hazardous air pollutant (HAP) means any H AP that is not organic.Page 14 of 182

Large commercial aircraft means an aircraft of more than 110,000 pounds, maximum certified take-off weight m anufactured for non-military use. Leak means any visible leakage, including misting a nd clouding. Limited access space means internal surfaces or pas sages of an aerospace vehicle or component that cannot be re ached without the aid of an airbrush or a spray gun extension for the application of coatings. Mechanical sanding means aerospace vehicle or compo nent surface conditioning which uses directional and ran dom orbital abrasive tools and aluminum oxide or nylon abrasive pads for the purpose of corrosion rework, substrate repair, prep aint surface preparation, and other maintenance activities. Natural draft opening means any opening in a room, building, or total enclosure that remains open duri ng operation of the facility and that is not connected to a duct in which a fan is installed. The rate and direction of the nat ural draft through such an opening is a consequence of the dif ference in pressures on either side of the wall containing the opening. Non-chemical based depainting equipment means any depainting equipment or technique, including, but n ot limited to, media blasting equipment, that can depaint an a erospacePage 15 of 182

vehicle or component in the absence of a chemical s tripper. This definition does not include mechanical sanding or h and sanding. Non-HAP material means, for the purposes of this su bpart, a primer, topcoat, specialty coating, chemical millin g maskant, cleaning solvent, or stripper that contains no more than 0.1 percent by mass of any individual organic HAP that is an Occupational Safety and Health Administration-defin ed carcinogen as specified in 29 CFR 1910.1200(d)(4) and no more than 1.0 percent by mass for any other individual HAP. Nonregenerative carbon adsorber means a carbon adso rber vessel in which the spent carbon bed does not under go carbon regeneration in the adsorption vessel. Operating parameter value means a minimum or maximu m value established for a control device or process paramet er which, if achieved by itself or in combination with one or mo re other operating parameter values, determines that an owne r or operator has complied with an applicable emission limitation

. Organic hazardous air pollutant (HAP) means any HAP that is organic. Primer means the first layer and any subsequent lay ers of identically formulated coating applied to the surfa ce of an aerospace vehicle or component. Primers are typical ly used for corrosion prevention, protection from the environme nt, functional fluid resistance, and adhesion of subseq uentPage 16 of 182

coatings. Coatings that are defined as specialty co atings are

not included under this definition. Radome means the non-metallic protective housing fo r electromagnetic transmitters and receivers (e.g., r adar, electronic countermeasures, etc.). Recovery device means an individual unit of equipme nt capable of and normally used for the purpose of rec overing chemicals for fuel value, use, or reuse. Examples o f equipment that may be recovery devices include absorbers, car bon adsorbers, condensers, oil-water separators, or org anic-water separators or organic removal devices such as decan ters, strippers, or thin-film evaporation units. Research and Development means an operation whose p rimary purpose is for research and development of new proc esses and products, that is conducted under the close supervi sion of technically trained personnel, and is not involved in the manufacture of final or intermediate products for c ommerical purposes, except in a de mimnimis manner. Self-priming topcoat means a topcoat that is applie d directly to an uncoated aerospace vehicle or compon ent for purposes of corrosion prevention, environmental pro tection, and functional fluid resistance. More than one layer of identical coating formulation may be applied to the vehicle o r component.Page 17 of 182

Semi-aqueous cleaning solvent means a solution in w hich water is a primary ingredient ( ′′ 60 percent of the solvent solution as applied must be water.) Softener means a liquid that is applied to an aeros pace vehicle or component to degrade coatings such as pr imers , topcoats , and specialty coatings specifically as a preparatory step to subsequent depainting by non-chemical based depainting equipment. Softeners may contain VOC but shall not contain any HAP as determined from MSDS's or manufacturer suppl ied

information. Solids means the non-volatile portion of the coatin g which after drying makes up the dry film. Space vehicle means a man-made device, either manne d or unmanned, designed for operation beyond earth's atm osphere. This definition includes integral equipment such as mode ls, mock-ups, prototypes, molds, jigs, tooling, hardware jackets, and test coupons. Also included is auxiliary equipment assoc iated with test, transport, and storage, which through contami nation can compromise the space vehicle performance. Specialty coating means a coating that, even though it meets the definition of a primer, topcoat, or self- priming topcoat, has additional performance criteria beyond those of primers, topcoats, and self-priming topcoats for sp ecific applications. These performance criteria may includ e, but are Deleted: andPage 18 of 182

not limited to, temperature or fire resistance, sub strate compatibility, antireflection, temporary protection or marking, sealing, adhesively joining substrates, or enhanced corrosion protection. Individual specialty coatings are defin ed in appendix A to this subpart and in the CTG for Aeros pace Manufacturing and Rework Operations (EPA 453/R-97-0 04). Spot stripping means the depainting of an area wher e it is not technically feasible to use a non-chemical depa inting technique. Spray-applied coating operation means coatings that are applied using a device that creates an atomized mis t of coating and deposits the coating on a substrate. For the pu rposes of this subpart, spray-applied coatings do not include the following materials or activities: (1) Coatings applied from a hand-held device with a paint cup capacity that is equal to or less than 3.0 flui d ounces (89 cubic centimeters) in which no more than 3.0 fluid ounces of coating is applied in a single application (i.e., t he total volume of a single coating formulation applied duri ng any one day to any one aerospace vehicle or component). Und er this definition, the use of multiple small paint cups an d the refilling of a small paint cup to spray apply more than 3.0 fluid ounces of a coating is a spray-applied coatin g operation. Under this definition, the use of a paint cup liner in aPage 19 of 182

reusable holder or cup that is designed to hold a l iner with a capacity of more than 3.0 fluid ounces is a spray-a pplied coating operation. (2) Application of coating using powder coating, ha nd-held non-refillable aerosol containers, or non-atomizing application technology, including but not limited to paint brus hes, rollers, flow coating, dip coating, electrodeposition coatin g, web coating, coil coating, touch-up markers, marking pe ns, trowels, spatulas, daubers, rags, sponges, mechanically and/ or pneumaticdriven syringes, and inkjet machines. (3) Application of adhesives, sealants, maskants, c aulking materials, and inks. Spray gun means a device that atomizes a coating or other material and projects the particulates or other mat erial onto a

substrate. Stripper means a liquid that is applied to an aeros pace vehicle or component to remove permanent coatings s uch as primers , topcoats , and specialty coatings. Surface preparation means the removal of contaminan ts from the surface of an aerospace vehicle or component, o r the activation or reactivation of the surface in prepar ation for the application of a coating. Temporary total enclosure means a total enclosure t hat is constructed for the sole purpose of measuring the e missions from Deleted: and Deleted:

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an affected source that are not delivered to an emi ssion control device. A temporary total enclosure must be constru cted and ventilated (through stacks suitable for testing) so that it has minimal impact on the performance of the permanent emission capture system. A temporary total enclosure will be assumed to achieve total capture of fugitive emissions if it c onforms to the requirements found in §63.750(g)(4) and if all natural draft openings are at least four duct or hood equivalent diameters away from each exhaust duct or hood. Alternatively, the owner or operator may apply to the Administrator for approva l of a temporary enclosure on a case-by-case basis. Topcoat means a coating that is applied over a prim er on an aerospace vehicle or component for appearance, iden tification, camouflage, or protection. Coatings that are define d as specialty coatings are not included under this defi nition. Total enclosure means a permanent structure that is constructed around a gaseous emission source so tha t all gaseous pollutants emitted from the source are collected an d ducted through a control device, such that 100% capture ef ficiency is achieved. There are no fugitive emissions from a to tal enclosure. The only openings in a total enclosure a re forced makeup air and exhaust ducts and any natural draft openings such as those that allow raw materials to enter and exit the enclosure for processing. All access doors or windo ws are closedPage 21 of 182

during routine operation of the enclosed source. Br ief, occasional openings of such doors or windows to acc ommodate process equipment adjustments are acceptable, but i f such openings are routine or if an access door remains o pen during the entire operation, the access door must be consi dered a natural draft opening. The average inward face velo city across the natural draft openings of the enclosure must be calculated including the area of such access doors. The drying oven itself may be part of the total enclosure. An enclosure th at meets the requirements found in §63.750(g)(4) is a permanent total

enclosure. Touch-up and repair operation means that portion of the coating operation that is the incidental applicatio n of coating used to cover minor imperfections in the coating fi nish or to achieve complete coverage. This definition includes out-ofsequence or out-of-cycle coating. Two-stage filter system means a dry particulate fil ter system using two layers of filter media to remove p articulate. The first stage is designed to remove the bulk of t he particulate and a higher efficiency second stage is designed to remove smaller particulate. Type I etchant means a chemical milling etchant tha t contains varying amounts of dissolved sulfur and do es not contain amines.Page 22 of 182

Type II etchant means a chemical milling etchant th at is a strong sodium hydroxide solution containing amines. Volatile organic compound (VOC) means any compound defined as VOC in 40 CFR 51.100. This includes any organic compound other than those determined by the EPA to be an exe mpt solvent. For purposes of determining compliance with emissio n limits, VOC will be measured by the approved test methods. Wher e such a method also inadvertently measures compounds that a re exempt solvent, an owner or operator may exclude these exe mpt solvents when determining compliance with an emission standa rd. Waterborne (water-reducible) coating means any coat ing that contains more than 5 percent water by weight as app lied in its

volatile fraction. Waterwash system means a control system that utiliz es flowing water (i.e., a conventional waterwash syste m) or a pumpless system to remove particulate emissions fro m the exhaust air stream in spray coating application or dry medi a blast depainting operations. Nomenclature for determining carbon adsorber effici ency—The nomenclature defined below is used in §63.750(g): (1) A k = the area of each natural draft opening (k) in a total enclosure, in square meters.Page 23 of 182

(2) C aj = the concentration of HAP or VOC in each gas stre am (j) exiting the emission control device, in parts p er million by

volume. (3) C bi = the concentration of HAP or VOC in each gas stre am (i) entering the emission control device, in parts per million by volume. (4) C di = the concentration of HAP or VOC in each gas stre am (i) entering the emission control device from the a ffected source, in parts per million by volume. (5) C fk = the concentration of HAP or VOC in each uncontrolled gas stream (k) emitted directly to the atmosphere from the affected source, in parts per million by v olume. (6) C gv = the concentration of HAP or VOC in each uncontrolled gas stream entering each individual ca rbon adsorber vessel (v), in parts per million by volume. For the purposes of calculating the efficiency of the individual carbon adsorber vessel, C gv

may be measured in the carbon adsorption system's common inlet duct prior to the branching of individ ual inlet

ducts to the individual carbon adsorber vessels. (7) C hv = the concentration of HAP or VOC in the gas strea m exiting each individual carbon adsorber vessel (v), in parts per million by volume. (8) E = the control device efficiency achieved for the duration of the emission test (expressed as a fract ion).Page 24 of 182

(9) F = the HAP or VOC emission capture efficiency of the HAP or VOC capture system achieved for the duration of the emission test (expressed as a fraction). (10) FV = the average inward face velocity across a ll natural draft openings in a total enclosure, in met ers per hour. (11) H v = the individual carbon adsorber vessel (v) efficiency achieved for the duration of the emissio n test (expressed as a fraction). (12) H sys = the efficiency of the carbon adsorption system

calculated when each carbon adsorber vessel has an individual exhaust stack (expressed as a fraction). (13) M ci = the total mass in kilograms of each batch of coating (i) applied, or of each coating applied at an affected coating operation during a 7 to 30-day period, as a ppropriate,

as determined from records at the affected source. This quantity shall be determined at a time and location in the p rocess after all ingredients (including any dilution solvent) ha ve been added to the coating, or if ingredients are added after t he mass of the coating has been determined, appropriate adjust ments shall

be made to account for them. (14) M r = the total mass in kilograms of HAP or VOC recovered for a 7 to 30-day period. (15) Q aj = the volumetric flow rate of each gas stream (j) exiting the emission control device in either dry s tandard cubicPage 25 of 182

meters per hour when EPA Method 18 in appendix A of part 60 is

used to measure HAP or VOC concentration or in stan dard cubic meters per hour (wet basis) when EPA Method 25A is used to measure HAP or VOC concentration. (16) Q bi = the volumetric flow rate of each gas stream (i) entering the emission control device, in dry standa rd cubic meters per hour when EPA Method 18 is used to measu re HAP or VOC concentration or in standard cubic meters per hour (wet basis)

when EPA Method 25A is used to measure HAP or VOC c oncentration. (17) Q di = the volumetric flow rate of each gas stream (i) entering the emission control device from the affec ted source in either dry standard cubic meters per hour when EPA Method 18 is

used to measure HAP or VOC concentration or in stan dard cubic meters per hour (wet basis) when EPA Method 25A is used to measure HAP or VOC concentration. (18) Q fk = the volumetric flow rate of each uncontrolled ga s stream (k) emitted directly to the atmosphere from the affected source in either dry standard cubic meters per hour when EPA Method 18 is used to measure HAP or VOC concentrati on or in standard cubic meters per hour (wet basis) when EPA Method 25A is used to measure HAP or VOC concentration. (19) Q gv = the volumetric flow rate of each gas stream entering each individual carbon adsorber vessel (v) in either dry standard cubic meters per hour when EPA Method 18 is used toPage 26 of 182

measure HAP or VOC concentration or in standard cub ic meters per hour (wet basis) when EPA Method 25A is used to mea sure HAP or VOC concentration. For purposes of calculating the efficiency of the individual carbon adsorber vessel, the value of Q gv can be assumed to equal the value of Q hv measured for that carbon

adsorber vessel. (20) Q hv = the volumetric flow rate of each gas stream exiting each individual carbon adsorber vessel (v) in either dry standard cubic meters per hour when EPA Method 18 i s used to measure HAP or VOC concentration or in standard cub ic meters per hour (wet basis) when EPA Method 25A is used to mea sure HAP or VOC concentration. (21) Q ini = the volumetric flow rate of each gas stream (i) entering the total enclosure through a forced makeu p air duct in standard cubic meters per hour (wet basis). (22) Q outj = the volumetric flow rate of each gas stream (j) exiting the total enclosure through an exhaust duct or hood in standard cubic meters per hour (wet basis). (23) R = the overall HAP or VOC emission reduction achieved for the duration of the emission test (expressed as a percentage). (24) RS i = the total mass in kilograms of HAP or VOC retained in the coating after drying.Page 27 of 182

(25) W oi = the weight fraction of VOC in each batch of coating (i) applied, or of each coating applied at an affected coating operation during a 7- to 30-day period, as appropriate, as determined by EPA Method 24 or formulation data. This value shall be determined at a time and location in the p rocess after all ingredients (including any dilution solvent) ha ve been added to the coating, or if ingredients are added after t he weight fraction of HAP or VOC in the coating has been dete rmined, appropriate adjustments shall be made to account fo r them. § 63.743 Standards: General. (a) Except as provided in paragraphs (a)(4) through (a)(10) of this section and in Table 1 of this subpart, eac h owner or operator of an affected source subject to this subp art is also subject to the following sections of subpart A of t his part: (1) §63.4, Prohibited activities and circumvention; (2) §63.5, Preconstruction review and notification requirements ; and (3) §63.6, Compliance with standards and maintenanc e requirements. (4) For the purposes of this subpart, all affected sources shall submit any request for an extension of compli ance not later than 120 days before the affected source's co mpliance date. The extension request should be requested for the shortest Deleted: Construction Deleted: reconstructionPage 28 of 182

time necessary to attain compliance, but in no case shall exceed 1 year. (5)(i) For the purposes of this subpart, the Admini strator (or the State with an approved permit program) will notify the owner or operator in writing of his/her intention t o deny approval of a request for an extension of complianc e submitted under either §63.6(i)(4) or §63.6(i)(5) within 60 c alendar days after receipt of sufficient information to evaluate the request. (ii) In addition, for purposes of this subpart, if the Administrator does not notify the owner or operator in writing of his/her intention to deny approval within 60 cal endar days after receipt of sufficient information to evaluate a request for an extension of compliance, then the request sh all be considered approved. (6)(i) For the purposes of this subpart, the Admini strator (or the State) will notify the owner or operator in writing of the status of his/her application submitted under §63.6(i)(4)(ii) (that is, whether the application c ontains sufficient information to make a determination) wit hin 30 calendar days after receipt of the original applica tion and within 30 calendar days after receipt of any supple mentary information that is submitted, rather than 15 calen dar days as provided for in §63.6(i)(13)(i).Page 29 of 182

(ii) In addition, for the purposes of this subpart, if the Administrator does not notify the owner or operator in writing of the status of his/her application within 30 cale ndar days after receipt of the original application and withi n 30 calendar days after receipt of any supplementary information that is submitted, then the information in the application or the supplementary information is to be considered suffi cient upon which to make a determination. (7) For the purposes of this subpart, each owner or operator who has submitted an extension request app lication under §63.6(i)(5) is to be provided 30 calendar day s to present additional information or arguments to the Administ rator after he/she is notified that the application is not comp lete, rather than 15 calendar days as provided for in §63.6(i)(1 3)(ii). (8) For the purposes of this subpart, each owner or operator is to be provided 30 calendar days to pres ent additional information to the Administrator after h e/she is notified of the intended denial of a compliance ext ension request submitted under either § 63.6(i)(4) or § 63 .6(i)(5), rather than 15 calendar days as provided for in § 63.6( i )(12)(iii)(B) and § 63.6(i)(13)(iii)(B). (9) For the purposes of this subpart, a final deter mination to deny any request for an extension submitted unde r either §63.6(i)(4) or §63.6(i)(5) will be made within 60 c alendar days Deleted: 1Page 30 of 182

after presentation of additional information or arg ument (if the application is complete), or within 60 calendar day s after the final date specified for the presentation if no pre sentation is made, rather than 30 calendar days as provided for in §63.6(i)(12)(iv) and §63.6(i)(13)(iv). (10) For the purposes of compliance with the requir ements of § 63.5(b)(4) of the General Provisions and this subpart, owners or operators of existing primer , topcoat , or specialty coating application operations and depainting operations w ho construct or reconstruct a spray booth or hangar th at does not have the potential to emit 10 tons/yr or more of an individual inorganic HAP or 25 tons/yr or more of all inorgani c HAP combined shall only be required to notify the Admin istrator of such construction or reconstruction on an annual ba sis.

Notification shall be submitted on or before March 1 of each year and shall include the information required in § 63.5(b)(4) for each such spray booth or hangar constructed or reconstructed during the prior calendar year, except that such in formation shall be limited to inorganic HAP . No advance notification or written approval from the Administrator pursuant to §63.5(b)(3) shall be required for the construction or reconstru ction of such a spray booth or hangar unless the booth or hangar has the potential to emit 10 tons/yr or more of an individu al inorganic HAP or 25 tons/yr or more of all inorganic HAP comb ined. Deleted: or

Deleted: HAP'sPage 31 of 182

(b) [Reserved] (c) An owner or operator who uses an air pollution control device or equipment not listed in this subpart shal l submit a description of the device or equipment, test data v erifying the performance of the device or equipment in controlli ng organic HAP and/or VOC emissions, as appropriate, and speci fic operating parameters that will be monitored to establish comp liance with the standards to the Administrator for approval not later than 120 days prior to the compliance date. (d) Instead of complying with the individual coatin g limits in §§63.745 and 63.747, a facility may choose to co mply with the averaging provisions specified in paragraphs (d)(1) through (d)(6) of this section. (1) Each owner or operator of a new or existing sou rce shall use any combination of primers, topcoats (inc luding selfpriming topcoats), specialty coatings, Type I chemical milling maskants, or Type II chemical milling maskants such that the monthly volume-weighted average organic HAP and VOC contents of the combination of primers, topcoats, specialty coatings, Type I chemical milling maskants, or Type II chemical mill ing maskants, as determined in accordance with the applicable pro cedures set forth in § 63.750, complies with the specified cont ent limits in §§ 63.745(c) and 63.747(c), unless the permitting a gency Deleted: (b) Startup, shutdown, and malfunction plan. Each owner or operator that uses an air pollution control device or equipment to control HAP emission s shall prepare a startup, shutdown, and malfunction plan in accordance with §63.6. Dry particulate filter sy stems operated per the manufacturer's instructions are exempt from a startup, shutdown, and malfunction plan. A startup, shutdown, and malfunction plan sha ll be prepared for facilities using locally prepared operating procedures. In addition to the informatio n required in §63.6, this plan shall also include the following provisions:¶ (1) The plan shall specify the operation and maintenance criteria for each air pollution control device or equipment and shall include a standardize d checklist to document the operation and maintenance of the equipment;¶ (2) The plan shall include a systematic procedure f or identifying malfunctions and for reporting them immediately to supervisory personnel; and¶ (3) The plan shall specify procedures to be followe d to ensure that equipment or process malfunctions due t o poor maintenance or other preventable conditions do not occur.¶Page 32 of 182

specifies a shorter averaging period as part of an ambient ozone control program. (2) Averaging is allowed only for uncontrolled prim ers, topcoats (including self-priming topcoats), specialty coatings, Type I chemical milling maskants, or Type II chemic al milling

maskants. (3) Averaging is not allowed between specialty coating types defined in Appendix A to this subpart, or bet ween the different types of coatings specified in paragraphs (d)(3)(i) through (d)(3)(vii) of this section. (i) Primers and topcoats (including self-priming to pcoats). (ii) Type I and Type II chemical milling maskants. ( iii) Primers and chemical milling maskants

. (iv) Topcoats and chemical milling maskants. (v) Primers and specialty coatings. (vi) Topcoats and specialty coatings. (vii) Chemical milling maskants and specialty coati ngs. (4) [Reserved] (5) [Reserved] (6) Each averaging scheme shall be approved in adva nce by the permitting agency and adopted as part of the fa cility's title V permit. (e) At all times, the owner or operator must operat e and maintain any affected source, including associated air pollution Deleted: primers and topcoats (including self-priming topcoats).

Deleted: (4) Averaging is not allowed between

Deleted: 5) Averaging is not allowed between primers Deleted: , or between topcoatsPage 33 of 182

control equipment and monitoring equipment, in a ma nner consistent with safety and good air pollution contr ol practices for minimizing emissions. The general duty to minim ize emissions does not require the owner or operator to make any further efforts to reduce emissions if levels required by t he applicable

standard have been achieved. Determination of wheth er a source is operating in compliance with operation and maint enance requirements will be based on information available to the Administrator which may include, but is not limited to, monitoring results, review of operation and mainten ance procedures, review of operation and maintenance rec ords, and inspection of the source. § 63.744 Standards: Cleaning operations. (a) Housekeeping measures. Each owner or operator o f a new or existing cleaning operation subject to this subp art shall comply with the requirements in paragraphs (a)(1) through (4) of this section unless the cleaning solvent used is identified in Table 1 of this section or meets the definition of "Non-HAP

material" in 63. 742. The requirements of paragraphs (a)(1) through (a)(4) of this section do not apply to spen t cleaning solvents, and solvent-laden applicators that are su bject to and handled and stored in compliance with 40 CFR parts 262 through 268 (including the air emission control requirement s in 40 CFR part 265, subpart CC ). Deleted: these

Deleted: contains HAP and VOC below Deleted: de minimis levels specified Deleted: § Deleted: 741(fPage 34 of 182

(1) Unless the owner or operator satisfies the requ irements in paragraph (a)(4) of this section, place used sol vent-laden cloth, paper, or any other absorbent applicators us ed for cleaning in bags or other closed containers. Ensure that these bags and containers are kept closed at all times ex cept when depositing or removing these materials from the con tainer. Use bags and containers of such design so as to contain the vapors of the cleaning solvent. Cotton-tipped swabs used f or very small cleaning operations are exempt from this requiremen t. (2) Unless the owner or operator satisfies the requ irements in paragraph (a)(4) of this section, store fresh an d spent cleaning solvents, except semi-aqueous solvent clea ners, used in aerospace cleaning operations in closed containers. (3) Conduct the handling and transfer of cleaning s olvents to or from enclosed systems, vats, waste containers , and other cleaning operation equipment that hold or store fre sh or spent cleaning solvents in such a manner that minimizes s pills. (4) Demonstrate to the Administrator (or delegated State, local, or Tribal authority) that equivalent or bett er alternative measures are in place compared to the u se of closed containers for the solvent-laden materials describe d in paragraph (a)(1) of this section, or the storage of solvents described in paragraph (a)(2) of this section. Moved (insertion) [1]Page 35 of 182

(b) Hand-wipe cleaning. Each owner or operator of a new or existing hand-wipe cleaning operation (excluding cl eaning of spray gun equipment performed in accordance with pa ragraph (c) of this section) subject to this subpart shall use cleaning solvents that meet one of the requirements specifie d in paragraphs (b)(1), (b)(2), and (b)(3) of this secti on. Cleaning solvent solutions that contain HAP and VOC below th e de minimis levels specified in §63.741(f) are exempt from the requirements in paragraphs (b)(1), (b)(2), and (b)(3) of this se ction. (1) Meet one of the composition requirements in Tab le 1 of this section; (2) Have a composite vapor pressure of 45 mm Hg (24 .1 in. H 2 O) or less at 20 °C (68 °F); or (3) Demonstrate that the volume of hand-wipe solven ts used in cleaning operations has been reduced by at least 60% from a baseline adjusted for production. The baseline shal l be established as part of an approved alternative plan administered by the State. Demonstrate that the volume of hand-w ipe cleaning solvents used in cleaning operations has been reduc ed by at least 60 percent from a baseline adjusted for produ ction. The baseline shall be calculated using data from 1996 a nd 1997, or as otherwise agreed upon by the Administrator or de legated State Authority. The baseline shall be approved by the Ad ministrator Moved up [1]: (3) Conduct the handling and transfer of cleaning solvents to or from enclosed systems, vats, waste containers, and other cleaning operation equipment that hold or store fresh or spent cleaning solvents in such a manner that minimizes spills.¶Page 36 of 182

or delegated State Authority and shall be included as part of the facility's title V or part 70 permit. (c) Spray gun cleaning. Each owner or operator of a new or existing spray gun cleaning operation subject to th is subpart in which spray guns are used for the application of co atings or any other materials that require the spray guns to be c leaned shall use one or more of the techniques, or their equival ent, specified in paragraphs (c)(1) through (c)(4) of th is section. Spray gun cleaning operations using cleaning solven t solutions

that contain HAP and VOC below the de minimis level s specified in §63.741(f) are exempt from the requirements in p aragraphs (c)(1) through (c)(4) of this section. (1)(i) Enclosed system. Clean the spray gun in an e nclosed system that is closed at all times except when inse rting or removing the spray gun. Cleaning shall consist of f orcing solvent through the gun. (ii) If leaks are found during the monthly inspecti on required in §63.751(a), repairs shall be made as so on as practicable, but no later than 15 days after the le ak was found. If the leak is not repaired by the 15th day after d etection, the cleaning solvent shall be removed, and the enclosed cleaner shall be shut down until the leak is repaired or it s use is permanently discontinued.Page 37 of 182

(2) Nonatomized cleaning. Clean the spray gun by pl acing cleaning solvent in the pressure pot and forcing it through the gun with the atomizing cap in place. No atomizing a ir is to be used. Direct the cleaning solvent from the spray gu n into a vat, drum, or other waste container that is closed when not in use. (3) Disassembled spray gun cleaning. Disassemble th e spray gun and clean the components by hand in a vat, whic h shall remain closed at all times except when in use. Alte rnatively, soak the components in a vat, which shall remain cl osed during the soaking period and when not inserting or removi ng components. (4) Atomizing cleaning. Clean the spray gun by forc ing the cleaning solvent through the gun and direct the res ulting atomized spray into a waste container that is fitte d with a device designed to capture the atomized cleaning so lvent emissions. (5) Cleaning of the nozzle tips of automated spray equipment systems, except for robotic systems that can be programmed to spray into a closed container, shall be exempt from the requirements of paragraph (c) of this sect ion. (d) Flush cleaning. Each owner or operator of a flu sh cleaning operation subject to this subpart (excludi ng those in which Table 1 or semi-aqueous cleaning solvents are used) shall empty the used cleaning solvent each time aerospace parts orPage 38 of 182

assemblies, or components of a coating unit (with t he exception of spray guns) are flush cleaned into an enclosed c ontainer or collection system that is kept closed when not in u se or into a system with equivalent emission control. (e) Exempt cleaning operations. The following clean ing operations are exempt from the requirements of para graph (b) of this section: (1) Cleaning during the manufacture, assembly, installation, maintenance, or testing of components of breathing oxygen systems that are exposed to the breathing ox ygen; (2) Cleaning during the manufacture, assembly, installation, maintenance, or testing of parts, sub assemblies, or assemblies that are exposed to strong oxidizers or reducers (e.g., nitrogen tetroxide, liquid oxygen, or hydraz ine); (3) Cleaning and surface activation prior to adhesi ve bonding; (4) Cleaning of electronic parts and assemblies con taining electronic parts; (5) Cleaning of aircraft and ground support equipme nt fluid systems that are exposed to the fluid, including ai r-to-air heat exchangers and hydraulic fluid systems; (6) Cleaning of fuel cells, fuel tanks, and confine d

spaces;Page 39 of 182

(7) Surface cleaning of solar cells, coated optics, and thermal control surfaces; (8) Cleaning during fabrication, assembly, installa tion, and maintenance of upholstery, curtains, carpet, an d other textile materials used in the interior of the aircr aft; (9) Cleaning of metallic and nonmetallic materials used in honeycomb cores during the manufacture or maintenan ce of these cores, and cleaning of the completed cores used in the manufacture of aerospace vehicles or components; (10) Cleaning of aircraft transparencies, polycarbo nate, or glass substrates; (11) Cleaning and cleaning solvent usage associated with research and development, quality control, and labo ratory testing; (12) Cleaning operations, using nonflamable liquids , conducted within five feet of energized electrical systems. Energized electrical systems means any AC or DC ele ctrical circuit on an assembled aircraft once electrical po wer is connected, including interior passenger and cargo a reas, wheel wells and tail sections; and (13) Cleaning operations identified as essential us es under the Montreal Protocol for which the Administrator h as allocated essential use allowances or exemptions in 40 CFR 82 .4.Page 40 of 182

Table 1—Composition Requirements for Approved Clean ing Solvents Cleaning solvent type Composition requirements Aqueous Cleaning solvents in which water is the pri mary

ingredient ( ≥ 80 percent of cleaning solvent solution as applied must be water). Detergents, surfactants, and bioenzyme mixtures and nutrients may be combined with the water along with a variety of additives, such as organic solvents (e.g., high boiling point alcohols), builders, saponifiers, inhibitors, emulsifiers, pH buffers, and antifoaming agents. Aqueous solutions must have a flash point greater than 93 °C (200 °F) (as reported by the manufacturer), and the solution must be miscible with water.Hydrocarbonbased Cleaners that are composed of photochemically

reactive hydrocarbons and/or oxygenated hydrocarbons and have a maximum vapor pressure of 7 mm Hg at 20 °C (3.75 in. H 2 O and 68 °F). These cleaners also contain no HAP. § 63.745 Standards: Primer , topcoat , and specialty coating application operations. (a) Each owner or operator of a new or existing pri mer , topcoat , or specialty coating application operation subject to this subpart shall comply with the requirements spe cified in paragraph (c) of this section for those coatings th at are uncontrolled (no control device is used to reduce o rganic HAP emissions from the operation), and in paragraph (d) of this section for those coatings that are controlled (org anic HAP emissions from the operation are reduced by the use of a control device). Aerospace equipment that is no longer oper ational, Deleted: and

Deleted: orPage 41 of 182

intended for public display, and not easily capable of being moved is exempt from the requirements of this secti on. (b) Each owner or operator shall conduct the handli ng and transfer of primers , topcoats , and specialty coatings to or from containers, tanks, vats, vessels, and piping system s in such a manner that minimizes spills. (c) Uncontrolled coatings—organic HAP and VOC conte nt levels. Each owner or operator shall comply with th e organic HAP and VOC content limits specified in paragraphs (c)( 1) through (c)( 6 ) of this section for those coatings that are uncon trolled. (1) Organic HAP emissions from primers shall be lim ited to an organic HAP content level of no more than: 540 g /L (4.5 lb/gal) of primer (less water), as applied, for gen eral aviation rework facilities; or 650 g/L (5.4 lb/gal) of exter ior primer (less water), as applied, to large commercial aircr aft components (parts or assemblies) or fully assembled , large commercial aircraft at existing affected sources th at produce fully assembled, large commercial aircraft; or 350 g/L (2.9 lb/gal) of primer (less water), as applied. (2) VOC emissions from primers shall be limited to a VOC content level of no more than: 540 g/L (4.5 lb/gal) of primer (less water and exempt solvents), as applied, for g eneral aviation rework facilities; or 650 g/L (5.4 lb/gal) of exterior primer (less water and exempt solvents), as applied , to large Deleted: and

Deleted: 4Page 42 of 182

commercial aircraft components (parts or assemblies ) or fully assembled, large commercial aircraft at existing af fected sources that produce fully assembled, large commerc ial aircraft; or 350 g/L (2.9 lb/gal) of primer (less water and e xempt solvents), as applied. (3) Organic HAP emissions from topcoats shall be li mited to an organic HAP content level of no more than: 420 g /L (3.5 lb/gal) of coating (less water) as applied or 540 g /L (4.5 lb/gal) of coating (less water) as applied for gene ral aviation rework facilities. Organic HAP emissions from self- priming topcoats shall be limited to an organic HAP content level of no more than: 420 g/L (3.5 lb/gal) of self-priming top coat (less water) as applied or 540 g/L (4.5 lb/gal) of self-p riming topcoat (less water) as applied for general aviatio n rework facilities. (4) VOC emissions from topcoats shall be limited to a VOC content level of no more than: 420 g/L (3.5 lb/gal) of coating (less water and exempt solvents) as applied or 540 g/L (4.5 lb/gal) of coating (less water and exempt solvents) as applied for general aviation rework facilities. VOC emissio ns from selfpriming topcoats shall be limited to a VOC content level of no more than: 420 g/L (3.5 lb/gal) of self-priming top coat (less water and exempt solvents) as applied or 540 g/L (4 .5 lb/gal) ofPage 43 of 182

self-priming topcoat (less water) as applied for ge neral aviation rework facilities. (5) Organic HAP emissions from specialty coatings s hall be limited to an organic HAP content level of no more than the HAP content limit specified in Table 1 of this section for each applicable specialty coating type. (6) VOC emissions from specialty coatings shall be limited

to a VOC content level of no more than the VOC cont ent limit specified in Table 1 of this section for each appli cable specialty coating type. Table 1. Specialty Coatings -- HAP and VOC Content Limits

Coating Type HAP Limit g/L (lb/gallon) 1 VOC Limit g/L (lb/gallon) 1 Ablative Coating 600 (5.0) 600 (5.0) Adhesion Promoter 890 (7.4) 890 (7.4) Adhesive Bonding Primers: Cured at 250°F or below 850 (7.1) 850 (7.1) Adhesive Bonding Primers: Cured above 250°F 1030 (8.6) 1030 (8.6)

Commercial Interior Adhesive 760 (6.3) 760 (6.3) Cyanoacrylate Adhesive 1,020 (8.5) 1,020 (8.5) Fuel Tank Adhesive 620 (5.2) 620 (5.2) Nonstructural Adhesive 360 (3.0) 360 (3.0) Rocket Motor Bonding Adhesive 890 (7.4) 890 (7.4) Rubber-based Adhesive 850 (7.1) 850 (7.1) Structural Autoclavable Adhesive 60 (0.5) 60 (0.5)

Structural Nonautoclavable Adhesive 850 (7.1) 850 (7.1) Antichafe Coating 660 (5.5) 660 (5.5) Bearing Coating 620 (5.2) 620 (5.2) Caulking and Smoothing Compounds 850 (7.1) 850 (7.1) Chemical Agent-Resistant Coating 550 (4.6) 550 (4.6) Clear Coating 720 (6.0) 720 (6.0)Page 44 of 182 Coating Type HAP Limit g/L (lb/gallon) 1 VOC Limit g/L (lb/gallon) 1 Commercial Exterior Aerodynamic Structure Primer 650 (5.4) 650 (5.4) Compatible Substrate Primer 780 (6.5) 780 (6.5) Corrosion Prevention System 710 (5.9) 710 (5.9) Cryogenic Flexible Primer 645 (5.4) 645 (5.4) Cryoprotective Coating 600 (5.0) 600 (5.0) Dry Lubricative Material 880 (7.3) 880 (7.3) Electric or Radiation-Effect Coating 800 (6.7) 800 (6.7) Electrostatic Discharge and Electromagnetic Interference (EMI) Coating 800 (6.7) 800 (6.7)

Elevated-Temperature SkydrolResistant Commercial Primer 740 (6.2) 740 (6.2) Epoxy Polyamide Topcoat 660 (5.5) 660 (5.5) Fire-Resistant (interior) Coating 800 (6.7) 800 (6.7)

Flexible Primer 640 (5.3) 640 (5.3) Flight-Test Coatings: Missile or Single Use Aircraft 420 (3.5) 420 (3.5) Flight-Test Coatings: All Other 840 (7.0) 840 (7.0) Fuel-Tank Coating 720 (6.0) 720 (6.0) High-Temperature Coating 850 (7.1) 850 (7.1) Insulation Covering 740 (6.2) 740 (6.2) Intermediate Release Coating 750 (6.3) 750 (6.3) Lacquer 830 (6.9) 830 (6.9) Bonding Maskant 1,230 (10.3) 1,230 (10.3) Critical Use and Line Sealer Maskant 1,020 (8.5) 1,020 (8.5)

Seal Coat Maskant 1,230 (10.3) 1,230 (10.3) Metallized Epoxy Coating 740 (6.2) 740 (6.2) Mold Release 780 (6.5) 780 (6.5) Optical Anti-Reflective Coating 750 (6.3) 750 (6.3) Part Marking Coating 850 (7.1) 850 (7.1) Pretreatment Coating 780 (6.5) 780 (6.5) Rain Erosion-Resistant Coating 850 (7.1) 850 (7.1) Rocket Motor Nozzle Coating 660 (5.5) 660 (5.5) Scale Inhibitor 880 (7.3) 880 (7.3) Screen Print Ink 840 (7.0) 840 (7.0) Extrudable/Rollable/Brushable Sealant 280 (2.3) 280 (2.3)

Sprayable Sealant 600 (5.0) 600 (5.0) Silicone Insulation Material 850 (7.1) 850 (7.1) Solid Film Lubricant 880 (7.3) 880 (7.3) Specialized Function Coating 890 (7.4) 890 (7.4)Page 45 of 182 Coating Type HAP Limit g/L (lb/gallon) 1 VOC Limit g/L (lb/gallon) 1 Temporary Protective Coating 320 (2.7) 320 (2.7) Thermal Control Coating 800 (6.7) 800 (6.7) Wet Fastener Installation Coating 675 (5.6) 675 (5.6) Wing Coating 850 (7.1) 850 (7.1)

1 Coating limits for HAP are expressed in terms of m ass (grams or pounds) of HAP per volume (liters or gallons) of co ating less water. Coating limits for VOC are expressed in term s of mass (grams or pounds) of VOC per volume (liters or gall ons) of coating less water and less exempt solvent.

(d) Controlled coatings—control system requirements . Each control system shall reduce the operation's organic HAP and VOC emissions to the atmosphere by 81% or greater, taki ng into account capture and destruction or removal efficien cies, as determined using the procedures in §63.750(g) when a carbon adsorber is used and in §63.750(h) when a control d evice other

than a carbon adsorber is used. (e) Compliance methods. Compliance with the organic HAP and VOC content limits specified in paragraphs (c)(1) t hrough (c)( 6 ) of this section shall be accomplished by using the methods specified in paragraphs (e)(1) and (e)(2) of this s ection either by themselves or in conjunction with one another. (1) Use primers , topcoats (including self-priming topcoats ), and specialty coatings with HAP and VOC content Deleted: 4

Deleted: and

Deleted: )Page 46 of 182

levels equal to or less than the limits specified i n paragraphs (c)(1) through (c)( 6 ) of this section; or (2) Use the averaging provisions described in §63.7 43(d). (f) Application equipment. Except as provided in pa ragraph (f)(3) of this section, each owner or operator of a new or existing primer , topcoat (including self-priming topcoat ), or specialty coating application operation subject to this subpart in which any of the coatings contain organic HAP or VOC shall comply with the requirements specified in paragraph s (f)(1) and (f)(2) of this section. (1) All spray applied primers , topcoats (including selfpriming topcoats ), and specialty coatings shall be applied using

one or more of the spray application techniques specified in paragraphs (f)(1)(i) through (f)(1)( v ) of this section. (i ) High volume low pressure (HVLP) spraying; ( ii ) Electrostatic spray application; (iii) Airless spray application; (iv) Air-assisted airless spray application; or ( v) Any other coating spray application methods that

achieve emission reductions or a transfer efficiency equivalent

to or better than HVLP spray, electrostatic spray , airless spray, or air-assisted airless spray application methods as determined according to the requirements in § 63.75 0(i). Deleted: 4

Deleted: or Deleted: )

Deleted: and

Deleted: )

Deleted: ix

Deleted: (i) Flow/curtain coat application;¶ (ii) Dip coat application;¶ (iii) Roll coating;¶ (iv) Brush coating;¶ (v) Cotton-tipped swab application;¶ (vi) Electrodeposition (dip) coating;¶ (vii Deleted: viii

Deleted: ix) Other

Deleted: or

Deleted: ,Page 47 of 182

(2) All coating spray application devices used to apply primers , topcoats (including self-priming topcoats ), or specialty coatings shall be operated according to company procedures, local specified operating procedures, a nd/or the manufacturer's specifications, whichever is most st ringent, at all times. Spray application equipment modified by the facility shall maintain a transfer efficiency equivalent to HVLP spray, electrostatic spray , airless spray, or air-assisted airless

spray application techniques. (3) The following situations are exempt from the requirements of paragraph (f)(1) of this section: (i) Any situation that normally requires an extensi on on the spray gun to properly reach limited access spac es; (ii) The application of coatings that contain fille rs that adversely affect atomization with HVLP spray guns ; (iii) The application of coatings that normally hav e a dried film thickness of less than 0.0013 centimeter (0.0005 in.) and that the permitting agency has determined canno t be applied by any of the application methods specified in para graph (f)(1) of this section; (iv) The use of airbrush application methods for stenciling, lettering, and other identification mar kings , and the spray application of no more than 3.0 fluid oun ces of coating in a single application (i.e., the total vo lume of a Deleted: or Deleted: )

Deleted: alltimes. Equipment

Deleted: and

Deleted: the use of an airbrush orPage 48 of 182

single coating formulation applied during any one d ay to any one aerospace vehicle or component) from a hand-held de vice with a paint cup capacity that is equal to or less than 3. 0 fluid ounces (89 cubic centimeters). Using multiple small paint cups or refilling a small paint cup to apply more than 3 .0 fluid ounces under the requirements of this paragraph is prohibited. If a paint cup liner is used in a reusable holder o r cup, then the holder or cup must be designed to hold a liner with a capacity of no more than 3.0 fluid ounces. For exam ple, a 3.0 ounce liner cannot be used in a holder that can als o be used with a 6.0 ounce liner under the requirements of th is paragraph ; (v) The use of hand-held non-refillable aerosol containers; (vi) Touch-up and repair operations ; (vii) Adhesives, sealants, maskants, caulking mater ials, and inks; and (viii) The application of coatings that contain les s than 20 grams of VOC per liter of coating. (g) Inorganic HAP emissions. Except as provided in paragraph (g)(4) of this section, each owner or ope rator of a new or existing primer , topcoat , or specialty coating application operation subject to this subpart in wh ich any of the coatings that are spray

- applied (as defined in § 63.742) and contain inorganic HAP, shall comply with the applic able Deleted: spray can application methods; and

Deleted:

.

Deleted: orPage 49 of 182

requirements in paragraphs (g)(1) through (g)(3) of this

section. (1) Apply these coatings in a booth , hangar , or portable

enclosure in which air flow is directed downward onto or acr oss the part or assembly being coated and exhausted thr ough one or

more outlets. (2) Control the air stream from this operation as f ollows: (i) For existing sources, the owner or operator mus t choose one of the following: (A) Before exhausting it to the atmosphere, pass th e air stream through a dry particulate filter system cert ified using the methods described in §63.750(o) to meet or exce ed the efficiency data points in Tables 2 and 3 of this section; or

Table 2 —Two-Stage Arrestor; Liquid Phase Challenge for Exi sting Sources Filtration efficiency requirement, % Aerodynamic particle size range, μm >90 >5.7 >50 >4.1 >10 >2.2

Table 3 —Two-Stage Arrestor; Solid Phase Challenge for Exis ting Sources Filtration efficiency requirement, % Aerodynamic particle size range, μm >90 >8.1 >50 >5.0 >10 >2.6 Deleted: or

Deleted: 1 Deleted: 2 Deleted: 1

Deleted: 2Page 50 of 182

(B) Before exhausting it to the atmosphere, pass th e air stream through a waterwash system that shall remain in operation during all coating application operations; or (C) Before exhausting it to the atmosphere, pass th e air stream through an air pollution control system that meets or exceeds the efficiency data points in Tables 2 and 3 of this section and is approved by the permitting authority

. (ii) For new sources, either: (A) Before exhausting it to the atmosphere, pass th e air stream through a dry particulate filter system cert ified using the methods described in §63.750(o) to meet or exce ed the efficiency data points in Tables 4 and 5 of this section; or

Table 4 —Three-Stage Arrestor; Liquid Phase Challenge for N ew Sources Filtration efficiency requirement, % Aerodynamic particle size range, μm >95 >2.0 >80 >1.0 >65 >0.42

Table 5 —Three-Stage Arrestor; Solid Phase Challenge for Ne w Sources Filtration efficiency requirement, % Aerodynamic particle size range, μm >95 >2.5 >85 >1.1 >75 >0.70 Deleted: 1 Deleted: 2

Deleted: 3 Deleted: 4 Deleted: 3

Deleted: 4Page 51 of 182

(B) Before exhausting it to the atmosphere, pass th e air stream through an air pollution control system that meets or exceeds the efficiency data points in Tables 4 and 5 of this section and is approved by the permitting authority

. (iii) Owners or operators of new sources that have

commenced construction or reconstruction after June 6, 1994 but prior to October 29, 1996 may comply with the follo wing requirements in lieu of the requirements in paragra ph (g)(2)(ii)

of this section: (A) Pass the air stream through either a two-stage dry particulate filter system or a waterwash system bef ore exhausting it to the atmosphere. (B) If the primer , topcoat , or specialty coating contains chromium or cadmium, control shall consist of a HEP A filter system, three-stage filter system, or other control system equivalent to the three

- stage filter system as approved by the permitting agency. (iv) If a dry particulate filter system is used, th e following requirements shall be met: (A) Maintain the system in good working order; (B) Install a differential pressure gauge across th e filter banks; (C) Continuously monitor the pressure drop across t he filter and read and record the pressure drop once p er shift , or Deleted: 3 Deleted: 4

Deleted: or

Deleted: ;Page 52 of 182

install an interlock system that will automatically shut down the coating spray application system if the pressur e drop exceeds or falls below the filter manufacturer's re commended limit(s); and (D) Take corrective action when the pressure drop e xceeds or falls below the filter manufacturer's recommende d limit(s). (v) If a conventional waterwash system is used, continuously monitor the water flow rate and read a nd record the water flow rate once per shift , or install an interlock system that will automatically shut down the coating spray application system if the water flow rate falls below or exceed s the limit(s) specified by the booth manufacturer or in locally prepared operating procedures. If a pumpless system is used, continuously monitor the booth parameter(s) that in dicate performance of the booth per the manufacturer's rec ommendations to maintain the booth within the acceptable operati ng efficiency range and read and record the parameters once per s hift , or install an interlock system that will automatically shut down the coating spray application system if the booth p arameters are outside the parameter range in the manufacturer's recommendations

. (3) If the pressure drop across the dry particulate filter system, as recorded pursuant to §63.752(d)(1), is o utside the limit(s) specified by the filter manufacturer or in locally Deleted:

.Page 53 of 182

prepared operating procedures, shut down the operat ion immediately and take corrective action. If the wate r path in the waterwash system fails the visual continuity/flow characteristics check, or the water flow rate recor ded pursuant to §63.752(d)(2) exceeds the limit(s) specified by the booth manufacturer or in locally prepared operating proce dures, or the booth manufacturer's or locally prepared maintenanc e procedures for the filter or waterwash system have not been pe rformed as scheduled, shut down the operation immediately and take corrective action. The operation shall not be resum ed until the pressure drop or water flow rate is returned within the specified limit(s). (4) The requirements of paragraphs (g)(1) through ( g)(3) of this section do not apply to the following: (i) Touch-up of scratched surfaces or damaged paint ; (ii) Hole daubing for fasteners; (iii) Touch-up of trimmed edges; (iv) Coating prior to joining dissimilar metal comp onents; (v) Stencil operations performed by brush or air br ush; (vi) Section joining; (vii) Touch-up of bushings and other similar parts; (viii) Sealant detackifying; (ix) Spray application of primers, topcoats, and sp ecialty coatings in an area identified in a title V permit, where t he Deleted: (ix) Painting partsPage 54 of 182

permitting authority has determined that it is not technically

feasible to spray apply coatings to the parts in a booth; (x) The use of hand-held non-refillable aerosol containers;

and (xi) Spray application of no more than 3.0 fluid ounces of coating in a single application (i.e., the total vo lume of a single coating formulation applied during any one d ay to any one aerospace vehicle or component) from a hand-held de vice with a paint cup capacity that is equal to or less than 3. 0 fluid ounces (89 cubic centimeters). Using multiple small paint cups or refilling a small paint cup to apply more than 3 .0 fluid ounces under the requirements of this paragraph is prohibited. If a paint cup liner is used in a reusable holder o r cup, then the holder or cup must be designed to hold a liner with a capacity of no more than 3.0 fluid ounces. For exam ple, under the requirements of this paragraph, a 3.0 ounce lin er cannot be used in a holder that can also be used with a 6.0 o unce liner

. § 63.746 Standards: Depainting operations. (a) Applicability. Each owner or operator of a new or existing depainting operation subject to this subpa rt shall comply with the requirements in paragraphs (a)(1) t hrough (a)(3) of this section, and with the requirements specifie d in paragraph (b) where there are no controls for organ ic HAP, or paragraph (c) where organic HAP are controlled usin g a control Deleted: paint Deleted: and Deleted: spray can

Deleted: methodsPage 55 of 182

system. This section does not apply to an aerospace manufacturing or rework facility that depaints six or less completed aerospace vehicles in a calendar year. (1) The provisions of this section apply to the dep ainting of the outer surface areas of completed aerospace v ehicles, including the fuselage, wings, and vertical and hor izontal stabilizers of the aircraft, and the outer casing a nd stabilizers of missiles and rockets. These provisio ns do not apply to the depainting of parts or units normally removed from the aerospace vehicle for depainting. However, depa inting of wings and stabilizers is always subject to the requ irements of this section regardless of whether their removal is considered by the owner or operator to be normal practice for depainting. (2) Aerospace vehicles or components that are inten ded for public display, no longer operational, and not easi ly capable of being moved are exempt from the requirements of thi s section. (3) The following depainting operations are exempt from the requirements of this section: (i) Depainting of radomes; and (ii) Depainting of parts, subassemblies, and assemb lies normally removed from the primary aircraft structur e before depainting. (b)(1) HAP emissions—non-HAP chemical strippers and technologies. Except as provided in paragraphs (b)( 2) and (b)(3)Page 56 of 182

of this section, each owner or operator of a new or existing aerospace depainting operation subject to this subp art shall emit no organic HAP from chemical stripping formula tions and agents or chemical paint softeners. (2) Where non-chemical based equipment is used to c omply with paragraph (b)(1) of this section, either in to tal or in part, each owner or operator shall operate and main tain the equipment according to the manufacturer's specifica tions or locally prepared operating procedures. During perio ds of malfunctions of such equipment, each owner or opera tor may use substitute materials during the repair period provi ded the substitute materials used are those available that minimize organic HAP emissions. In no event shall substitute materials be used for more than 15 days annually, unless such ma terials are organic HAP-free. (3) Each owner or operator of a new or existing dep ainting operation shall not, on an annual average basis, us e more than 26 gallons of organic HAP-containing chemical strip pers or alternatively 190 pounds of organic HAP per commerc ial aircraft depainted; or more than 50 gallons of organic HAP-c ontaining chemical strippers or alternatively 365 pounds of o rganic HAP per military aircraft depainted for spot stripping and decal

removal.Page 57 of 182

(4) Each owner or operator of a new or existing dep ainting operation complying with paragraph (b)(2), that gen erates airborne inorganic HAP emissions from dry media bla sting equipment, shall also comply with the requirements specified in paragraphs (b)(4)(i) through (b)(4)(v) of this sect ion. (i) Perform the depainting operation in an enclosed area, unless a closed-cycle depainting system is used. (ii)(A) For existing sources , pass any air stream removed from the enclosed area or closed-cycle depainting s ystem through a dry particulate filter system, certified using th e method described in § 63.750(o) to meet or exceed the effi ciency data points in Tables 2 and 3 of § 63.745, through a baghouse, or through a waterwash system before exhausting it to the atmosphere. (B) For new sources , pass any air stream removed from the enclosed area or closed-cycle depainting system thr ough a dry particulate filter system certified using the metho d described in §63.750(o) to meet or exceed the efficiency data points in

Tables 4 and 5 of § 63.745 or through a baghouse before exhausting it to the atmosphere. ( C ) Owners or operators of new sources that have comm enced construction or reconstruction after June 6, 1994 b ut prior to October 29, 1996 may comply with the following requ irements in Deleted: 1 Deleted: 2

Deleted: 3 Deleted: 4

Deleted: cPage 58 of 182

lieu of the requirements in paragraph (b)(4)(ii)(B) of this

section: ( 1 ) Pass the air stream through either a two-stage dr y particulate filter system or a waterwash system bef ore exhausting it to the atmosphere. ( 2 ) If the coating being removed contains chromium or cadmium, control shall consist of a HEPA filter sys tem, threestage filter system, or other control system equiva lent to the three-stage filter system as approved by the permit ting agency. (iii) If a dry particulate filter system is used, t he following requirements shall be met: (A) Maintain the system in good working order; (B) Install a differential pressure gauge across th e filter banks; (C) Continuously monitor the pressure drop across t he filter, and read and record the pressure drop once per shift;

and (D) Take corrective action when the pressure drop e xceeds or falls below the filter manufacturer's recommende d limits. (iv) If a waterwash system is used, continuously mo nitor the water flow rate, and read and record the water flow rate once per shift. (v) If the pressure drop, as recorded pursuant to §63.752(e)(7), is outside the limit(s) specified by the filterPage 59 of 182

manufacturer or in locally prepared operating proce dures, whichever is more stringent, shut down the operatio n immediately and take corrective action. If the water path in th e waterwash system fails the visual continuity/flow characteris tics check, as recorded pursuant to §63.752(e)(7), or the water flow rate, as recorded pursuant to §63.752(d)(2), exceeds the limit(s) specified by the booth manufacturer or in locally p repared operating procedures, or the booth manufacturer's o r locally prepared maintenance procedures for the filter or w aterwash system have not been performed as scheduled, shut d own the operation immediately and take corrective action. T he operation shall not be resumed until the pressure drop or wat er flow rate is returned within the specified limit(s). (5) Mechanical and hand sanding operations are exem pt from the requirements in paragraph (b)(4) of this sectio n. (c) Organic HAP emissions—organic HAP-containing ch emical strippers. Each owner or operator of a new or exist ing organic HAP-containing chemical stripper depainting operati on subject to this subpart shall comply with the requirements spe cified in this paragraph. (1) All organic HAP emissions from the operation sh all be reduced by the use of a control system. Each contro l system that was installed before the effective date shall reduc e the operations' organic HAP emissions to the atmosphere by 81Page 60 of 182

percent or greater, taking into account capture and destruction

or removal efficiencies. (2) Each control system installed on or after the e ffective date shall reduce organic HAP emissions to the atmo sphere by 95 percent or greater. Reduction shall take into accou nt capture and destruction or removal efficiencies, and may ta ke into account the volume of chemical stripper used relati ve to baseline levels (e.g., the 95 percent efficiency ma y be achieved by controlling emissions at 81 percent efficiency w ith a control system and using 74 percent less stripper than in b aseline applications). The baseline shall be calculated usi ng data from 1996 and 1997, which shall be on a usage per aircra ft or usage per square foot of surface basis. (3) The capture and destruction or removal efficien cies are to be determined using the procedures in §63.750(g) when a carbon adsorber is used and those in §63.750(h) whe n a control device other than a carbon adsorber is used. § 63.747 Standards: Chemical milling maskant applic ation operations. (a) Each owner or operator of a new or existing che mical milling maskant operation subject to this subpart s hall comply with the requirements specified in paragraph (c) of this section for those chemical milling maskants that are uncont rolled (no control device is used to reduce organic HAP emissi ons from thePage 61 of 182

operation) and in paragraph (d) of this section for those chemical milling maskants that are controlled (orga nic HAP emissions from the operation are reduced by the use of a control device). (b) Each owner or operator shall conduct the handli ng and transfer of chemical milling maskants to or from co ntainers, tanks, vats, vessels, and piping systems in such a manner that minimizes spills. (c) Uncontrolled maskants—organic HAP and VOC conte nt levels. Each owner or operator shall comply with th e organic HAP and VOC content limits specified in paragraphs (c)( 1) and (c)(2) of this section for each chemical milling maskant t hat is

uncontrolled. (1) Organic HAP emissions from chemical milling mas kants shall be limited to organic HAP content levels of n o more than 622 grams of organic HAP per liter (5.2 lb/gal) of Type I chemical milling maskant (less water) as applied, a nd no more than 160 grams of organic HAP per liter (1.3 lb/gal ) of Type II chemical milling maskant (less water) as applied. (2) VOC emissions from chemical milling maskants sh all be limited to VOC content levels of no more than 622 g rams of VOC per liter (5.2 lb/gal) of Type I chemical milling m askant (less water and exempt solvents) as applied, and no more than 160Page 62 of 182

grams of VOC per liter (1.3 lb/gal) of Type II chem ical milling maskant (less water and exempt solvents) as applied

. (3) The requirements of paragraphs (c)(1) and (c)(2 ) of this section do not apply to the following: (i) Touch-up of scratched surfaces or damaged maska nt; and (ii) Touch-up of trimmed edges. (d) Controlled maskants—control system requirements . Each control system shall reduce the operation's organic HAP and VOC emissions to the atmosphere by 81% or greater, taki ng into account capture and destruction or removal efficien cies, as determined using the procedures in §63.750(g) when a carbon adsorber is used and in §63.750(h) when a control d evice other

than a carbon adsorber is used. (e) Compliance methods. Compliance with the organic HAP and VOC content limits specified in paragraphs (c)(1) a nd (c)(2) of this section may be accomplished by using the metho ds specified in paragraphs (e)(1) and (e)(2) of this section eit her by themselves or in conjunction with one another. (1) Use chemical milling maskants with HAP and VOC content levels equal to or less than the limits specified i n paragraphs (c)(1) and (c)(2) of this section. (2) Use the averaging provisions described in §63.7 43(d). § 63.748 Standards: Handling and storage of waste.Page 63 of 182

(a) The owner or operator of each facility subject to this subpart that produces a waste that contains organic HAP from aerospace primer, topcoat, specialty coating, chemi cal milling maskant, or chemical depainting operations must be handled and stored as specified in paragraph (a)(1) or (a)(2) o f this section. The requirements of paragraphs (a)(1) and (a)(2) of this section do not apply to spent wastes that cont ain organic HAP that are subject to and handled and stored in c ompliance with 40 CFR parts 262 through 268 (including the ai r emission control requirements in 40 CFR 265, subpart CC). (1) Conduct the handling and transfer of the waste to or from containers, tanks, vats, vessels, and piping s ystems in such a manner that minimizes spills. (2) Store all waste that contains organic HAP in cl osed containers. (b) [Reserved] § 63.749 Compliance dates and determinations. (a) Compliance dates. (1) Each owner or operator of an existing affected source subject to this subpart sh all comply with the requirements of this subpart by September 1, 1998, except as specified in paragraphs (a)(2) and (a)(3) of this section. Owners or operators of new affected source s subject to this subpart shall comply on the effective date or upon startup, whichever is later. In addition, each owner or oper ator shall Deleted: Except as provided in §63.741(e), the

Deleted: HAP shall conduct

Deleted: paragraphPage 64 of 182

comply with the compliance dates specified in § 63. 6(b) and (c ) as indicated in Table 1 to this subpart. (2) Owners or operators of existing primer , topcoat , or specialty coating application operations and depainting operations who construct or reconstruct a spray boo th or hangar must comply with the new source requirements for in organic HAP specified in §§ 63.745(g)(2)(ii) and 63.746(b)(4) f or that new spray booth or hangar upon startup. Such sources mu st still comply with all other existing source requirements by September 1, 1998. (3) Each owner or operator of a specialty coating application operation that begins construction or r econstruction after February 17, 2015 shall be in compliance with the requirements of this subpart on [insert date of publication in the Federal Register] or upon startup, whichever is later. Each owner or operator of a specialty coating applicatio n operation that is existing on February 17, 2015 shall be in c ompliance with the requirements of this subpart on or before [insert date 3 years after the date of publication in the Federa l Register]

. (b) General. Each facility subject to this subpart shall be considered in noncompliance if the owner or operato r uses a control device , other than one specified in this subpart , that has not been approved by the Administrator, as requ ired by §63.743(c). Deleted: ).

Deleted: or

Deleted: fails to submit a startup, shutdown, and malfunction plan as required by §63.743(b) orPage 65 of 182

(c) Cleaning operations. Each cleaning operation su bject to this subpart shall be considered in noncompliance i f the owner or operator fails to institute and carry out the ho usekeeping measures required under §63.744(a). Incidental emis sions resulting from the activation of pressure release v ents and valves on enclosed cleaning systems are exempt from this paragraph. (1) Hand-wipe cleaning. An affected hand-wipe clean ing operation shall be considered in compliance when al l hand-wipe cleaning solvents, excluding those used for hand cl eaning of spray gun equipment under §63.744(c)(3), meet eithe r the composition requirements specified in §63.744(b)(1) or the vapor pressure requirement specified in §63.744(b)(2). (2) Spray gun cleaning. An affected spray gun clean ing operation shall be considered in compliance when ea ch of the following conditions is met: (i) One of the four techniques specified in §63.744 (c)(1) through (c)(4) is used; (ii) The technique selected is operated according t o the procedures specified in §63.744 (c)(1) through (c)( 4) as appropriate; and (iii) If an enclosed system is used, monthly visual inspections are conducted and any leak detected is repaired within 15 days after detection. If the leak is not repaired byPage 66 of 182

the 15th day after detection, the solvent shall be removed and the enclosed cleaner shall be shut down until the c leaner is repaired or its use is permanently discontinued. (3) Flush cleaning. An affected flush cleaning oper ation shall be considered in compliance if the operating requirements specified in §63.744(d) are implemented and carried out. (d) Organic HAP and VOC content levels—primer , topcoat , and specialty coating application operations—(1) Performance test periods. For uncontrolled coatings that are not ave raged, each 24 hours is considered a performance test. For comp liant and non-compliant coatings that are averaged together, each 30-day period is considered a performance test, unless the permitting agency specifies a shorter averaging period as part of an ambient ozone control program. When using a control device other than a carbon adsorber, three 1-hour runs constitut e the test period for the initial and any subsequent performan ce test. When using a carbon adsorber, each rolling material bala nce period is considered a performance test. (2) Initial performance tests. If a control device is used, each owner or operator shall conduct an initial per formance test to demonstrate compliance with the overall reductio n efficiency specified in paragraph §63.745, unless a waiver is obtained under either §63.7(e)(2)(iv) or §63.7(h). The initi al performance test shall be conducted according to th e procedures Deleted: andPage 67 of 182

and test methods specified in §§63.7 and 63.750(g) for carbon adsorbers and in §63.750(h) for control devices oth er than carbon adsorbers. For carbon adsorbers, the initial performance test shall be used to establish the appropriate rol ling material balance period for determining compliance. The proc edures in paragraphs (d)(2)(i) through (d)(2)(vi) of this sec tion shall be used in determining initial compliance with the pro visions of this subpart for carbon adsorbers. (i)(A) When either EPA Method 18 or EPA Method 25A is to be used in the determination of the efficiency of a fi xed-bed carbon adsorption system with a common exhaust stac k for all the individual carbon adsorber vessels pursuant to §63. 750(g) (2) or (4), the test shall consist of three separate runs, each coinciding with one or more complete sequences thro ugh the adsorption cycles of all of the individual carbon a dsorber

vessels. (B) When either EPA Method 18 or EPA Method 25A is to be used in the determination of the efficiency of a fi xed-bed carbon adsorption system with individual exhaust st acks for each carbon adsorber vessel pursuant to §63.750(g) (3) o r (4), each carbon adsorber vessel shall be tested individually . The test for each carbon adsorber vessel shall consist of th ree separate runs. Each run shall coincide with one or more comp lete adsorption cycles.Page 68 of 182

(ii) EPA Method 1 or 1A of appendix A of part 60 is used for sample and velocity traverses. (iii) EPA Method 2, 2A, 2C, or 2D of appendix A of part 60 is used for velocity and volumetric flow rates. (iv) EPA Method 3 of appendix A of part 60 is used for gas analysis. (v) EPA Method 4 of appendix A of part 60 is used f or stack gas moisture. (vi) EPA Methods 2, 2A, 2C, 2D, 3, and 4 shall be performed, as applicable, at least twice during eac h test period. (3) The primer application operation is considered in compliance when the conditions specified in paragra phs (d)(3)(i) through (d)(3)(iv) of this section, as applicable, and in paragraph (e) of this section are met. Failure to m eet any one of the conditions identified in these paragraphs sh all constitute noncompliance. The compliance demonstration for a primer may be based on the organic HAP content or t he VOC content of the primer; demonstrating compliance wit h both the HAP content limit and the VOC content limit is not required. If a primer contains HAP solvents that are exempt from the definition of VOC in §63.741 and 40 CFR 51.100, the n the HAP content must be used to demonstrate compliance.Page 69 of 182

(i) For all uncontrolled primers, all values of H i and H a (as determined using the procedures specified in § 63.750(c) and (d)) are less than or equal to the applicable HAP content limit in § 63.745(c)(1), and all values of G i and G a (as determined using the procedures specified in § 63.750 (e) and (f)) are less than or equal to the applicable VOC content limit in § 63.745(c)(2). (ii) If a control device is used: (A) The overall control system efficiency, E k , as determined using the procedures specified in §63.750(g) for co ntrol systems containing carbon adsorbers and in §63.750(h) for c ontrol systems with other control devices, is equal to or greater than 81% during the initial performance test and any sub sequent performance test; (B) If an incinerator other than a catalytic incine rator is used, the average combustion temperature for all 3- hour periods is greater than or equal to the average combustion temperature established under §63.751(b)(11); and (C) If a catalytic incinerator is used, the average combustion temperatures for all 3-hour periods are greater than or equal to the average combustion temperatures est ablished under §63.751(b)(12). (iii)(A) Uses an application technique specified in § 63.745 (f)(1)(i) through (f)(1)( viii ), or Deleted: 350 grams of organic Deleted: per liter (2.9 lb/gal) of primer (less water) as applied,

Deleted: 350 grams of organic Deleted: per liter (2.9 lb/gal) of primer (less water and exempt solvents) as applied.Page 70 of 182

(B) Uses an alternative application technique, as a llowed under §63.745(f)(1)( ix ), such that the emissions of both organic HAP and VOC for the implementation period of the al ternative application method are less than or equal to the em issions generated using HVLP or electrostatic spray application methods as determined using the procedures specified in §63 .750(i). (iv) Operates all application techniques in accorda nce with the manufacturer's specifications or locally prepar ed operating procedures, whichever is more stringent. (4) The topcoat or specialty coating application operation is considered in compliance when the conditions spe cified in paragraphs ( d )(4)(i) through ( d )(4)(iv) of this section, as applicable, and in paragraph ( e ) of this section are met. Failure to meet any of the conditions identified in these paragraphs shall constitute noncompliance. (i) The topcoat application operation is considered in compliance when the conditions specified in paragra ph (d)(4)(i)(A) are met. The specialty coating applica tion operation is considered in compliance when the cond itions specified in paragraph (d)(4)(i)(B) are met. The co mpliance demonstration for a topcoat or a specialty coating may be based on the organic HAP content or the VOC content of th e coating; demonstrating compliance with both the HAP content limit and the VOC content limit is not required. If a topcoat or specialty Deleted: e Deleted: e Deleted: f

Deleted: (iPage 71 of 182

coating contains HAP solvents that are exempt from the definition of VOC in §63.741 and 40 CFR 51.100, the n the HAP content must be used to demonstrate compliance. (A ) For all uncontrolled topcoats, all values of H i and H a (as determined using the procedures specified in § 63.750(c) and (d)) are less than or equal to the applicable HAP content limit in § 63.745(c)( 3 ), and all values of G i and G a (as determined using the procedures specified in § 63.750(e) and ( f)) are less than or equal to the applicable VOC content limit in § 63.745(c)(4). (B) For all uncontrolled specialty coatings, all va lues of

H i and H a (as determined using the procedures specified in § 63.750(c) and (d)) are less than or equal to the HA P content limits specified in Table 1 to § 63.745 for the app licable specialty coating types (less water) as applied, an d all values

of G i and G a (as determined using the procedures specified in § 63.750(e) and (f)) are less than or equal to the VO C content limits specified in Table 1 to § 63.745 for the app licable specialty coating types (less water and exempt solvents) as applied. (ii) If a control device is used, (A) The overall control system efficiency, E k , as determined using the procedures specified in §63.750(g) for co ntrol systems containing carbon adsorbers and in §63.750(h) for c ontrol Deleted: 420 grams organic HAP per liter (

Deleted: .5 lb/gal) of topcoat (less water) as applied,

Deleted: 420 grams organic Deleted: per liter (3.5 lb/gal)

Deleted: topcoatPage 72 of 182

systems with other control devices, is equal to or greater than 81% during the initial performance test and any sub sequent performance test; (B) If an incinerator other than a catalytic incine rator is used, the average combustion temperature for all 3- hour periods is greater than or equal to the average combustion temperature established under §63.751(b)(11); and (C) If a catalytic incinerator is used, the average combustion temperatures for all 3-hour periods are greater than or equal to the average combustion temperatures est ablished under §63.751(b)(12). (iii)(A) Uses an application technique specified in § 63.745(f)(1)(i) through (f)(1)( iv ); or (B) Uses an alternative application technique, as a llowed under § 63.745(f)(1)( v ), such that the emissions of both organic HAP and VOC for the implementation period of the al ternative application method are less than or equal to the em issions generated using HVLP spray, electrostatic spray , airless spray, or air-assisted airless spray application methods as determined using the procedures specified in § 63.750(i). (iv) Operates all application techniques in accorda nce with the manufacturer's specifications or locally prepar ed operating procedures. Deleted: viii

Deleted: ix

Deleted: orPage 73 of 182

(e) Inorganic HAP emissions—primer , topcoat , and specialty coating application operations. For each primer , topcoat , or specialty coating application operation that emits inorganic HAP, the operation is in compliance when: (1) It is operated according to the requirements sp ecified in §63.745(g)(1) through (g)(3); and (2) It is shut down immediately whenever the pressu re drop or water flow rate is outside the limit(s) establis hed for them and is not restarted until the pressure drop or wat er flow rate is returned within these limit(s), as required unde r §63.745(g)(3). (f) Organic HAP emissions—Depainting operations—(1) Performance test periods. When using a control devi ce other than a carbon adsorber, three 1-hour runs constitute the test period for the initial and any subsequent performance test . When a carbon adsorber is used, each rolling material bala nce period is considered a performance test. Each 24-hour period is considered a performance test period for determining complianc e with §63.746(b)(1). For uncontrolled organic emissions f rom depainting operations, each calendar year is consid ered a performance test period for determining compliance with the HAP limits for organic HAP-containing chemical stripper s used for spot stripping and decal removal. Deleted: and

Deleted: orPage 74 of 182

(2) Initial performance tests. If a control device is used, each owner or operator shall conduct an initial per formance test to demonstrate compliance with the overall reductio n efficiency specified in §63.746(c), unless a waiver is obtaine d under either §63.7(e)(2)(iv) or §63.7(h). The initial per formance test shall be conducted according to the procedures and test methods specified in §§ 63.7 and 63.750(g) for carbon adsorbers and in §63.750(h) for control devices other than carbon ad sorbers. For carbon adsorbers, the initial performance test shal l be used to establish the appropriate rolling material balance period for determining compliance. The procedures in paragraph s (2)(i) through (2)(vi) of this section shall be used in de termining initial compliance with the provisions of this subp art for

carbon adsorbers. (i)(A) When either EPA Method 18 or EPA Method 25A is to be used in the determination of the efficiency of a fi xed-bed carbon adsorption system with a common exhaust stac k for all the individual carbon adsorber vessels pursuant to §63. 750(g)(2) or (4), the test shall consist of three separate runs, each coinciding with one or more complete sequences thro ugh the adsorption cycles of all of the individual carbon a dsorber

vessels. (B) When either EPA Method 18 or EPA Method 25A is to be used in the determination of the efficiency of a fi xed-bedPage 75 of 182

carbon adsorption system with individual exhaust st acks for each carbon adsorber vessel pursuant to §63.750(g) (3) o r (4), each carbon adsorber vessel shall be tested individually . The test for each carbon adsorber vessel shall consist of th ree separate runs. Each run shall coincide with one or more comp lete adsorption cycles. (ii) EPA Method 1 or 1A of appendix A of part 60 is used for sample and velocity traverses. (iii) EPA Method 2, 2A, 2C, or 2D of appendix A of part 60 is used for velocity and volumetric flow rates. (iv) EPA Method 3 of appendix A of part 60 is used for gas analysis. (v) EPA Method 4 of appendix A of part 60 is used f or stack gas moisture. (vi) EPA Methods 2, 2A, 2C, 2D, 3, and 4 shall be performed, as applicable, at least twice during eac h test period. (3) An organic HAP-containing chemical stripper dep ainting operation is considered in compliance when the cond itions specified in paragraph (g)(3)(i) of this section ar e met. (i) If a carbon adsorber (or other control device) is used, the overall control efficiency of the control syste m, as determined using the procedures specified in §63.75 0(g) (or other control device as determined using the proced uresPage 76 of 182

specified in §63.750(h)), is equal to or greater th an 81% for control systems installed before the effective date , or equal to or greater than 95% for control systems installed o n or after the effective date, during the initial performance test and all subsequent material balances (or performance tests, as appropriate). (ii) For non-HAP depainting operations complying wi th §63.746(b)(1); (A) For any spot stripping and decal removal, the v alue of C, as determined using the procedures specified in §63.750(j), is less than or equal to 26 gallons of organic HAP- containing chemical stripper or 190 pounds of organic HAP per commercial aircraft depainted calculated on a yearly average; and is less than or equal to 50 gallons of organic HAP-containi ng chemical stripper or 365 pounds of organic HAP per military aircraft depainted calculated on a yearly average; and (B) The requirements of §63.746(b)(2) are carried o ut during malfunctions of non-chemical based equipment

. (g) Inorganic HAP emissions—depainting operations. Each depainting operation is in compliance when: (1) The operating requirements specified in §63.746 (b)(4) are followed; and (2) It is shut down immediately whenever the pressu re drop or water flow rate is outside the limit(s) establis hed for themPage 77 of 182

and is not restarted until the pressure drop or wat er flow rate is returned within these limit(s), as required unde r §63.746(b)(4)(v). (h) Chemical milling maskant application operations —(1) Performance test periods. For uncontrolled chemical milling maskants that are not averaged, each 24-hour period is considered a performance test. For compliant and no ncompliant chemical milling maskants that are averaged togethe r, each 30- day period is considered a performance test, unless the permitting agency specifies a shorter period as par t of an ambient ozone control program. When using a control device other than a carbon adsorber, three 1-hour runs constitut e the test period for the initial and any subsequent performan ce test. When a carbon adsorber is used, each rolling material ba lance period is considered a performance test. (2) Initial performance tests. If a control device is used, each owner or operator shall conduct an initial per formance test to demonstrate compliance with the overall reductio n efficiency specified in §63.747(d), unless a waiver is obtaine d under either §63.7(e)(2)(iv) or §63.7(h). The initial per formance test shall be conducted according to the procedures and test methods specified in §63.7 and §63.750(g) for carbon adsorb ers and in §63.750(h) for control devices other than carbon ad sorbers. For carbon adsorbers, the initial performance test shal l be used toPage 78 of 182

establish the appropriate rolling material balance period for determining compliance. The procedures in paragraph s (h)(2)(i) through (vi) of this section shall be used in deter mining initial compliance with the provisions of this subp art for

carbon adsorbers. (i)(A) When either EPA Method 18 or EPA Method 25A is to be used in the determination of the efficiency of a fi xed-bed carbon adsorption system with a common exhaust stac k for all the individual carbon adsorber vessels pursuant to §63. 750(g) (2) or (4), the test shall consist of three separate runs, each coinciding with one or more complete sequences thro ugh the adsorption cycles of all of the individual carbon a dsorber

vessels. (B) When either EPA Method 18 or EPA Method 25A is to be used in the determination of the efficiency of a fi xed-bed carbon adsorption system with individual exhaust st acks for each carbon adsorber vessel pursuant to §63.750(g) (3) o r (4), each carbon adsorber vessel shall be tested individually . The test for each carbon adsorber vessel shall consist of th ree separate runs. Each run shall coincide with one or more comp lete adsorption cycles. (ii) EPA Method 1 or 1A of appendix A of part 60 is used for sample and velocity traverses.Page 79 of 182

(iii) EPA Method 2, 2A, 2C, or 2D of appendix A of part 60 is used for velocity and volumetric flow rates. (iv) EPA Method 3 of appendix A of part 60 is used for gas analysis. (v) EPA Method 4 of appendix A of part 60 is used f or stack gas moisture. (vi) EPA Methods 2, 2A, 2C, 2D, 3, and 4 shall be performed, as applicable, at least twice during eac h test period. (3) The chemical milling maskant application operat ion is considered in compliance when the conditions specif ied in paragraphs (i)(3)(i) and (i)(3)(ii) of this section are met. The compliance demonstration for a chemical milling mas kant may be based on the organic HAP content or the VOC content of the chemical milling maskant; demonstrating compliance with both the HAP content limit and the VOC content limit is not required. If a chemical milling maskant contains HAP solvents th at are exempt from the definition of VOC in §63.741 and 40 CFR 51 .100, then the HAP content must be used to demonstrate complia nce. (i) For all uncontrolled chemical milling maskants, all

values of H i and H a (as determined using the procedures specified in §63.750 (k) and (l)) are less than or equal to 6 22 grams of organic HAP per liter (5.2 lb/gal) of Type I chemic al milling maskant as applied (less water), and 160 grams of o rganic HAPPage 80 of 182

per liter (1.3 lb/gal) of Type II chemical milling maskant as applied (less water). All values of G i and G a (as determined using the procedures specified in §63.750 (m) and ( n)) are less than or equal to 622 grams of VOC per liter (5.2 lb /gal) of Type I chemical milling maskant as applied (less water a nd exempt solvents), and 160 grams of VOC per liter (1.3 lb/g al) of Type II chemical milling maskant (less water and exempt solvents) as applied. (ii) If a carbon adsorber (or other control device) is used, the overall control efficiency of the control system, as determined using the procedures specified in §63.75 0(g) (or systems with other control devices as determined us ing the procedures specified in §63.750(h)), is equal to or greater than 81% during the initial performance test period and all subsequent material balances (or performance tests, as appropriate). (i) Handling and storage of waste. For those wastes subject to this subpart, failure to comply with the require ments specified in §63.748 shall be considered a violatio n. (j) Performance tests shall be conducted under such conditions as the Administrator specifies to the ow ner or operator based on representative performance of the affected source for the period being tested. Representative conditions exclude periods of startup and shutdown unless spec ified by thePage 81 of 182

Administrator or an applicable subpart. The owner o r operator may not conduct performance tests during periods of malfunction. The owner or operator must record the process infor mation that is necessary to document operating conditions durin g the test and include in such record an explanation to suppor t that such conditions represent normal operation. Upon request , the owner or operator shall make available to the Administrat or such records as may be necessary to determine the condit ions of performance tests. § 63.750 Test methods and procedures. (a) Composition determination. Compliance with the handwipe cleaning solvent approved composition list spe cified in §63.744(b)(1) for hand-wipe cleaning solvents shall be demonstrated using data supplied by the manufacture r of the cleaning solvent. The data shall identify all compo nents of the cleaning solvent and shall demonstrate that one of the approved composition definitions is met. (b) Vapor pressure determination. The composite vap or pressure of hand-wipe cleaning solvents used in a c leaning operation subject to this subpart shall be determin ed as

follows: (1) For single-component hand-wipe cleaning solvent s, the vapor pressure shall be determined using MSDS or ot herPage 82 of 182

manufacturer's data, standard engineering reference texts, or other equivalent methods. (2) The composite vapor pressure of a blended hand- wipe solvent shall be determined by quantifying the amou nt of each organic compound in the blend using manufacturer's supplied data or a gas chromatographic analysis in accordance wit h ASTM E 260- 91 or 96 (incorporated by reference—see §63.14 of s ubpart A of this part) and by calculating the composite vapor p ressure of the solvent by summing the partial pressures of eac h component. The vapor pressure of each component shall be deter mined using manufacturer's data, standard engineering reference texts, or other equivalent methods. The following equation sh all be used to determine the composite vapor pressure:

where:

W i = Weight of the “i”th VOC compound, grams. W w = Weight of water, grams. W e = Weight of non-HAP, nonVOC compound, grams. MW i = Molecular weight of the “i”th VOC compound, g/gmole. MW w = Molecular weight of water, g/g-mole. MW e = Molecular weight of exempt compound, g/g-mole. PP c = VOC composite partial pressure at 20 °C, mm Hg. VP i = Vapor pressure of the “i”th VOC compound at 20 ° C,Page 83 of 182 mm Hg.

(c) Organic HAP content level determination—complia nt primers , topcoats , and specialty coatings. For those uncontrolled primers , topcoats , and specialty coatings complying with the primer , topcoat , or specialty coating organic HAP content limits specified in § 63.745(c) without bei ng averaged, the procedures in paragraphs (c)(1) through (c)(3) of this

section shall be used to determine the mass of organic HAP emitted per volume of coating (less water) as appli ed. As an alternative to the procedures in paragraphs (c)(1) through (c)(3) of this section, an owner or operator may us e the coating manufacturer’s supplied data to demonstrate that or ganic HAP emitted per volume of coating (less water), as appl ied, is less than or equal to the applicable organic HAP limit s pecified in § 63.745(c). Owners and operators that use the coatin g manufacturer’s supplied data to demonstrate complia nce based on the HAP content of the coating may add non-HAP solv ent to those coatings provided that the owner or operator also m aintains records of the non-HAP solvent added to the coating

. (1) For coatings that contain no exempt solvents, d etermine the total organic HAP content using manufacturer's supplied data or Method 24 of 40 CFR part 60, appendix A, to dete rmine the VOC content. The VOC content shall be used as a surroga te for total Deleted: and Deleted:

. Deleted: and Deleted: and

Deleted: followingPage 84 of 182

HAP content for coatings that contain no exempt sol vent. If there is a discrepancy between the manufacturer's f ormulation data and the results of the Method 24 analysis, com pliance shall be based on the results from the Method 24 analysis

. When Method 24 is used to determine the VOC content of water-reducible coatings, the precision adjustment factors in Reference Method 24 shall be used. If the adjusted analytical VOC content is less than the formulation solvent co ntent, then the analytical VOC content should be set equal to t he formulation solvent content. (2) For each coating formulation as applied, determ ine the organic HAP weight fraction, water weight fraction (if applicable), and density from manufacturer's data. If the value for organic HAP weight fraction cannot be determine d using the manufacturer's data, the owner or operator shall us e Method 311 of 40 CFR part 63, appendix A, or submit an alterna tive procedure for determining the value for approval by the Administrator. If the values for water weight fract ion (if applicable) and density cannot be determined using the manufacturer's data, the owner or operator shall su bmit an alternative procedure for determining their values for approval by the Administrator. Recalculation is required onl y when a change occurs in the coating formulation. If there is a discrepancy between the manufacturer's formulation data and the Deleted: If these valuesPage 85 of 182

results of the Method 311 analysis, compliance shal l be based on the results from the Method 311 analysis. (3) For each coating as applied, calculate the mass of organic HAP emitted per volume of coating (lb/gal) less water as applied using equations 1, 2, and 3:

where: V wi = volume (gal) of water in one gal of coating i. D ci = density (lb of coating per gal of coating) of

coating i. W wi = weight fraction (expressed as a decimal) of wate r

in coating i. D w = density of water, 8.33 lb/gal.

where: M Hi = mass (lb) of organic HAP in one gal of coating i

. D ci = density (lb of coating per gal of coating) of

coating i. W Hi = weight fraction (expressed as a decimal) of orga nic

HAP in coating i.

where: H i = mass of organic HAP emitted per volume of coatin g i

(lb/gal) less water as applied. M Hi = mass (lb) of organic HAP in one gal of coating i

. V wi = volume (gal) of water in one gal of coating i.Page 86 of 182

(d) Organic HAP content level determination—average d primers , topcoats , and specialty coatings. For those uncontrolled primers , topcoats , and specialty coatings that are averaged together in order to comply with the prime r , topcoat , and specialty coating organic HAP content limits specified in § 63.745(c), the following procedure shall be used to determine the monthly volume-weighted average mass of organic HAP emitted per volume of coating (less water) as applied, unle ss the permitting agency specifies a shorter averaging per iod as part of an ambient ozone control program. (1)(i) Determine the total organic HAP weight fract ion as applied of each coating. If any ingredients, includ ing diluent solvent, are added to a coating prior to its applic ation, the organic HAP weight fraction of the coating shall be determined at a time and location in the process after all ing redients have

been added. (ii) Determine the total organic HAP weight fractio n of each coating as applied each month. (A) If no changes have been made to a coating, eith er as supplied or as applied, or if a change has been mad e that has a minimal effect on the organic HAP content of the co ating, the value previously determined may continue to be used until a Deleted: and Deleted:

. Deleted: and Deleted: andPage 87 of 182

change in formulation has been made by either the m anufacturer

or the user. (B) If a change in formulation or a change in the ingredients added to the coating takes place, inclu ding the ratio of coating to diluent solvent, prior to its a pplication,

either of which results in a more than minimal effe ct on the organic HAP content of the coating, the total organ ic HAP weight fraction of the coating shall be redetermined. (iii) Manufacturer's formulation data may be used t o determine the total organic HAP content of each coa ting and any ingredients added to the coating prior to its appli cation. If the total organic HAP content cannot be determined using the manufacturer's data, the owner or operator shall use Method 311 of 40 CFR part 63, appendix A for determining the t otal organic HAP weight fraction, or shall submit an alternative procedure for determining the total organic HAP weight fracti on for approval by the Administrator. If there is a discrepancy between the manufacturer's formulation data and the results of the Method 311 analysis, compliance shall be based on t he results from the Method 311 analysis. (2)(i) Determine the volume both in total gallons a s applied and in total gallons (less water) as applie d of each coating. If any ingredients, including diluent solv ents, are added prior to its application, the volume of each coating shallPage 88 of 182

be determined at a time and location in the process after all ingredients (including any diluent solvent) have be en added. (ii) Determine the volume of each coating (less wat er) as applied each month, unless the permitting agency sp ecifies a shorter period as part of an ambient ozone control program. (iii) The volume applied may be determined from com pany records. (3)(i) Determine the density of each coating as app lied. If any ingredients, including diluent solvent, are add ed to a coating prior to its application, the density of th e coating shall be determined at a time and location in the p rocess after all ingredients have been added. (ii) Determine the density of each coating as appli ed each month, unless the permitting agency specifies a sho rter period as part of an ambient ozone control program. (A) If no changes have been made to a coating, eith er as supplied or as applied, or if a change has been mad e that has a minimal effect on the density of the coating, then the value previously determined may continue to be used until a change in formulation has been made by either the manufacture r or the

user. (B) If a change in formulation or a change in the ingredients added to the coating takes place, inclu ding the ratio of coating to diluent solvent, prior to its a pplication,Page 89 of 182

either of which results in a more than minimal effe ct on the density of the coating, then the density of the coa ting shall be

redetermined. (iii) The density may be determined from company re cords, including manufacturer's data sheets. If the densit y of the coating cannot be determined using the company's re cords, including the manufacturer's data, then the owner o r operator shall submit an alternative procedure for determini ng the density for approval by the Administrator. (4) Calculate the total volume in gallons as applie d (less water) by summing the individual volumes of each co ating (less water) as applied, which were determined under para graph (d)(2) of this section. (5) Calculate the volume-weighted average mass of o rganic HAP in coatings emitted per unit volume (lb/gal) of coating (less water) as applied during each 30-day period u sing equation

4:

where: H a = volume-weighted average mass of organic HAP emit ted

per unit volume of coating (lb/gal) (less water) as applied during each 30-day period for those coatings being averaged. n = number of coatings being averaged.Page 90 of 182

W Hi = weight fraction (expressed as a decimal) of orga nic

HAP in coating i as applied that is being averaged during each 30-day period. D ci = density (lb of coating per gal of coating) of

coating i as applied that is being averaged during each 30-day period. V ci = volume (gal) of coating i as applied that is bei ng

averaged during the 30-day period. C lw = total volume (gal) of all coatings (less water) as

applied that are being averaged during each 30-day period.

(e) VOC content level determination—compliant prime rs , topcoats , and specialty coatings. For those uncontrolled primers , topcoats , and specialty coatings complying with the primer , topcoat , and specialty coating VOC content levels specified in § 63.745(c) without being averaged, th e procedures in paragraphs (e)(1) through (e)(3) of this section shall be used to determine the mass of VOC emitted per volum e of coating (less water and exempt solvents) as applied. As an alternative to the procedures in paragraphs (e)(1) through (e)( 3) of this section, an owner or operator may use coating manuf acturer’s supplied data to demonstrate that VOC emitted per v olume of coating (less water and exempt solvents), as applie d, is less than or equal to the applicable VOC limit specified in § 63.745(c). (1) Determine the VOC content of each formulation ( less water and exempt solvents) as applied using manufac turer's supplied data or Method 24 of 40 CFR part 60, appen dix A, to Deleted: and

Deleted:

. Deleted: and

Deleted: and

Deleted: following procedurePage 91 of 182

determine the VOC content. The VOC content shall be used as a surrogate for total HAP content for coatings that c ontain no exempt solvent. If there is a discrepancy between t he manufacturer's formulation data and the results of the Method 24 analysis, compliance shall be based on the results from the Method 24 analysis.

When Method 24 is used to determine the VOC content of water-reducible coatings, the precision adjustment factors in Reference Method 24 shall be used. If the adjusted analytical

VOC content is less than the formulation solvent co ntent, then the analytical VOC content should be set equal to t he formulation solvent content. (2) For each coating applied, calculate the mass of VOC emitted per volume of coating (lb/gal) (less water and exempt solvents) as applied using equations 5, 6, and 7:

where: V wi = volume (gal) of water in one gal of coating i. D ci = density (lb of coating per gal of coating) of

coating i. W wi = weight fraction (expressed as a decimal) of wate r

in coating i. D w = density of water, 8.33 lb/gal.Page 92 of 182

where: M Vi = mass (lb) of VOC in one gal of coating i. D ci = density (lb of coating per gal of coating) of

coating i. W Vi = weight fraction (expressed as a decimal) of VOC in

coating i.

where: G i = mass of VOC emitted per volume of coating i

(lb/gal) (less water and exempt solvents) as applied. M Vi = mass (lb) of VOC in one gal of coating i. V wi = volume (gal) of water in one gal of coating i. V Xi = volume (gal) of exempt solvents in one gal of

coating i.

(3)(i) If the VOC content is found to be different when EPA Method 24 is used during an enforcement inspection from that used by the owner or operator in calculating G a , compliance shall be based, except as provided in paragraph (e)(3)(ii ) of this section, upon the VOC content obtained using EPA Me thod 24. (ii) If the VOC content of a coating obtained using Method 24 would indicate noncompliance as determined under either §63.749 (d)(3)(i) or (d)(4)(i), an owner or operato r may elect to average the coating with other uncontrolled coat ings and (re)calculate G i (using the procedure specified in paragraph (f) of this section), provided appropriate and sufficie nt recordsPage 93 of 182

were maintained for all coatings included in the av erage (re)calculation. The (re)calculated value of G i (G a in paragraph (f)) for the averaged coatings shall then be used t o determine compliance. (f) VOC content level determination—averaged primer s , topcoats , and specialty coatings. For those uncontrolled primers , topcoats , and specialty coatings that are averaged within their respective coating category in order t o comply with the primer , topcoat , and specialty coating VOC content limits specified in § 63.745 (c)(2 ), (c)(4), and (c)( 6 ), the following procedure shall be used to determine the monthly vo lume-weighted average mass of VOC emitted per volume of coating ( less water and exempt solvents) as applied, unless the permitt ing agency specifies a shorter averaging period as part of an ambient ozone control program. (1)(i) Determine the VOC content (lb/gal) as applie d of each coating. If any ingredients, including diluent solvent, are added to a coating prior to its application, the VO C content of the coating shall be determined at a time and locat ion in the process after all ingredients have been added. (ii) Determine the VOC content of each coating as a pplied each month, unless the permitting agency specifies a shorter period as part of an ambient ozone control program. Deleted: and

Deleted:

. Deleted: and

Deleted: and

Deleted: ) Deleted: 4Page 94 of 182

(A) If no changes have been made to a coating, eith er as supplied or as applied, or if a change has been mad e that has a minimal effect on the VOC content of the coating, t he value previously determined may continue to be used until a change in formulation has been made by either the manufacture r or the

user. (B) If a change in formulation or a change in the ingredients added to the coating takes place, inclu ding the ratio of coating to diluent solvent, prior to its a pplication,

either of which results in a more than minimal effe ct on the VOC content of the coating, the VOC content of the coat ing shall be

redetermined. (iii) Determine the VOC content of each primer , topcoat , and specialty coating formulation (less water and exempt solvents) as applied using EPA Method 24 or from ma nufacturer's

data. (2)(i) Determine the volume both in total gallons a s applied and in total gallons (less water and exempt solvents) as applied of each coating. If any ingredients, includ ing diluent solvents, are added prior to its application, the v olume of each coating shall be determined at a time and location in the process after all ingredients (including any diluen t solvent)

have been added. Deleted: andPage 95 of 182

(ii) Determine the volume of each coating (less wat er and exempt solvents) as applied each day. (iii) The volume applied may be determined from com pany records. (3) Calculate the total volume in gallons (less wat er and exempt solvents) as applied by summing the individu al volumes of each coating (less water and exempt solvents) as ap plied, which were determined under paragraph (f)(2) of this sect ion. (4) Calculate the volume-weighted average mass of V OC emitted per unit volume (lb/gal) of coating (less w ater and exempt solvents) as applied for each coating catego ry during each 30-day period using equation 8:

where: G a = volume weighted average mass of VOC per unit vol ume

of coating (lb/gal) (less water and exempt solvents) as applied during each 30-day period for those coatings being averaged. n = number of coatings being averaged. (VOC) ci = VOC content (lb/gal) of coating i (less water an d exempt

solvents) as applied (as determined using the procedures specified in paragraph (f)(1) of this section) that is being averaged during the 30-day period. V ci = volume (gal) of coating i (less water and exempt

solvents) as applied that is being averaged during the 30-day period. C lwes = total volume (gal) of all coatings (less water a ndPage 96 of 182 exempt solvents) as applied during each 30-day period for those coatings being averaged.

(5)(i) If the VOC content is found to be different when EPA Method 24 is used during an enforcement inspection from that used by the owner or operator in calculating G a , recalculation of

G a is required using the new value. If more than one coating is involved, the recalculation shall be made once usin g all of the

new values. (ii) If recalculation is required, an owner or oper ator may elect to include in the recalculation of G a uncontrolled coatings that were not previously included provided appropri ate and sufficient records were maintained for these other coatings to allow daily recalculations. (iii) The recalculated value of G a under either paragraph (f)(5)(i) or (f)(5)(ii) of this section shall be us ed to determine compliance. (g) Overall VOC and/or organic HAP control efficien cy— carbon adsorber. Each owner or operator subject to the requirements of §63.745(d), §63.746(c), or §63.747( d) shall demonstrate initial compliance with the requirement s of this subpart by following the procedures of paragraph (g )(1), (2), (3), (4), or (5) as applicable and paragraphs (6), (7), and (8) of this section. When an initial compliance demonst ration is required by this subpart, the procedures in paragra phs (g)(9)Page 97 of 182

through (g)(14) of this section shall be used in de termining initial compliance with the provisions of this subp art. (1) To demonstrate initial and continuous complianc e with §63.745(d), §63.746(c), or §63.747(d) when emission s are controlled by a dedicated solvent recovery device, each owner or operator of the affected operation may perform a li quid-liquid HAP or VOC material balance over rolling 7- to 30-d ay periods in lieu of demonstrating compliance through the method s in paragraph (g)(2), (g)(3), or (g)(4) of this section . Results of the material balance calculations performed to demo nstrate initial compliance shall be submitted to the Admini strator with the notification of compliance status required by § 63.9(h) and by §63.753 (c)(1)(iv), (d)(3)(i), and (e)(3). When demonstrating compliance by this procedure, §63.7(e)(3) of subpar t A does not apply. The amount of liquid HAP or VOC applied and recovered shall be determined as discussed in paragraph (g)(1 )(iii) of

this section. The overall HAP or VOC emission reduc tion (R) is calculated using equation 9:

(i) The value of RS i is zero unless the owner or operator submits the following information to the Administra tor for approval of a measured RS i value that is greater than zero:Page 98 of 182

(A) Measurement techniques; and (B) Documentation that the measured value of RS i exceeds

zero. (ii) The measurement techniques of paragraph (g)(1) (i)(A)

of this section shall be submitted to the Administr ator for approval with the notification of performance test required under §63.7(b). (iii) Each owner or operator demonstrating complian ce by the test method described in paragraph (g)(1) of th is section

shall: (A) Measure the amount of coating or stripper as ap plied; (B) Determine the VOC or HAP content of all coating and stripper applied using the test method specified in §63.750(c) (1) through (3) or (e)(1) and (2) of this section; (C) Install, calibrate, maintain, and operate, acco rding to the manufacturer's specifications, a device that in dicates the amount of HAP or VOC recovered by the solvent recov ery device over rolling 7- to 30-day periods; the device shall be certified by the manufacturer to be accurate to within ±2.0 p ercent, and this certification shall be kept on record; (D) Measure the amount of HAP or VOC recovered; and (E) Calculate the overall HAP or VOC emission reduc tion (R) for rolling 7- to 30-day periods using equation 9.Page 99 of 182

(F) Compliance is demonstrated if the value of R is equal to or greater than the overall HAP control efficien cies required by §63.745(d), §63.746(c), or §63.747(d). (2) To demonstrate initial compliance with §63.745( d), §63.746(c), or §63.747(d) when affected HAP emissio n points are controlled by an emission control device other than a fixed-bed carbon adsorption system with individual exhaust st acks for each carbon adsorber vessel, each owner or operator of a n affected source shall perform a gaseous emission test using the following procedures. (i) Construct the overall HAP emission reduction sy stem so that all volumetric flow rates and total HAP or VOC emissions can be accurately determined by the applicable test methods and procedures specified in §63.750(g)(9) through (14). (ii) Determine capture efficiency from the HAP emis sion points by capturing, venting, and measuring all HAP emissions from the HAP emission points. During a performance test, the owner or operator of affected HAP emission points l ocated in an area with other gaseous emission sources not affect ed by this subpart shall isolate the affected HAP emission poi nts from all other gaseous emission points by one of the followi ng methods: (A) Build a temporary total enclosure around the af fected HAP emission point(s); orPage 100 of 182

(B) Shut down all gaseous emission points not affec ted by this subpart and continue to exhaust fugitive emiss ions from the affected HAP emission points through any building v entilation system and other room exhausts such as drying ovens . All ventilation air must be vented through stacks suita ble for testing. (iii) Operate the emission control device with all affected HAP emission points connected and operating. (iv) Determine the efficiency (E) of the control de vice using equation 10: (v) Determine the efficiency (F) of the capture sys tem using equation 11:

(vi) For each HAP emission point subject to §63.745 (d), §63.746(c), or §63.747(d), compliance is demonstrat ed if the product of (E) × (F) is equal to or greater than th e overall HAP control efficiencies required under §63.745(d), §63 .746(c), or §63.747(d).Page 101 of 182

(3) To demonstrate compliance with §63.745(d), §63. 746(c), or §63.747(d) when affected HAP emission points are controlled by a fixed-bed carbon adsorption system with indivi dual exhaust stacks for each carbon adsorber vessel, each owner or operator of an affected source shall perform a gaseous emiss ion test using the following procedures: (i) Construct the overall HAP emission reduction sy stem so that each volumetric flow rate and the total HAP em issions can be accurately determined by the applicable test met hods and procedures specified in §63.750(g)(9) through (14); (ii) Assure that all HAP emissions from the affecte d HAP emission point(s) are segregated from gaseous emiss ion points not affected by this subpart and that the emissions can be captured for measurement, as described in paragraph s (g)(2)(ii) (A) and (B) of this section; (iii) Operate the emission control device with all affected HAP emission points connected and operating; (iv) Determine the efficiency (H v ) of each individual carbon adsorber vessel (v) using equation 12:

(v) Determine the efficiency of the carbon adsorpti on system (H sys ) by computing the average efficiency of the individual carbon adsorber vessels as weighted by t he volumetricPage 102 of 182

flow rate (Q hv ) of each individual carbon adsorber vessel (v) using equation 13:

(vi) Determine the efficiency (F) of the capture sy stem using equation 11. (vii) For each HAP emission point subject to §63.74 5(d), §63.746(c), or §63.747(d), compliance is demonstrat ed if the product of (H sys ) × (F) is equal to or greater than the overall HAP control efficiency required by §63.745(d), §63. 746(c), or §63.747(d). (4) An alternative method of demonstrating complian ce with §63.745(d), §63.746(c), or §63.747(d) is the instal lation of a total enclosure around the affected HAP emission po int(s) and the ventilation of all HAP emissions from the total enclosure to a control device with the efficiency specified in p aragraph (g)(4)(iii) of this section. If this method is sele cted, the compliance test methods described in paragraphs (g) (1), (g)(2), and (g)(3) of this section are not required. Instea d, each owner or operator of an affected source shall: (i) Demonstrate that a total enclosure is installed . An enclosure that meets the requirements in paragraphs (g)(4)(i) (A) through (D) of this section shall be considered a totalPage 103 of 182

enclosure. The owner or operator of an enclosure th at does not meet these requirements may apply to the Administra tor for approval of the enclosure as a total enclosure on a case-by-case basis. The enclosure shall be considered a total en closure if it

is demonstrated to the satisfaction of the Administ rator that all HAP emissions from the affected HAP emission po int(s) are contained and vented to the control device. The req uirements for automatic approval are as follows: (A) The total area of all natural draft openings sh all not

exceed 5% of the total surface area of the total en closure's walls, floor, and ceiling; (B) All sources of emissions within the enclosure s hall be a minimum of four equivalent diameters away from ea ch natural draft opening; (C) The average inward face velocity (FV) across al l natural draft openings shall be a minimum of 3,600 meters per hour as determined by the following procedures: ( 1 ) All forced makeup air ducts and all exhaust ducts are constructed so that the volumetric flow rate in eac h can be accurately determined by the test methods and proce dures specified in §63.750(g) (10) and (11); volumetric f low rates shall be calculated without the adjustment normally made for moisture content; and ( 2 ) Determine FV by equation 14:Page 104 of 182

(D) The air passing through all natural draft openi ngs shall flow into the enclosure continuously. If FV i s less than or equal to 9,000 meters per hour, the continuous i nward flow of air shall be verified by continuous observation usi ng smoke tubes, streamers, tracer gases, or other means appr oved by the Administrator over the period that the volumetric f low rate tests required to determine FV are carried out. If FV is greater than 9,000 meters per hour, the direction of airflo w through the natural draft openings shall be presumed to be inwa rd at all times without verification. (ii) Determine the control device efficiency using equation 10 or equations 12 and 13, as applicable, and the t est methods and procedures specified in §63.750(g)(9) through ( 14). (iii) Compliance shall be achieved if the installat ion of a total enclosure is demonstrated and the value of E determined from equation 10 (or the value of H sys determined from equations 12 and 13, as applicable) is equal to or greater th an the overall HAP control efficiencies required under §63 .745(d), §63.746(c), or §63.747(d). (5) When nonregenerative carbon adsorbers are used to comply with §63.745(d), §63.746(c), or §63.747(d), the owner orPage 105 of 182

operator may conduct a design evaluation to demonst rate initial compliance in lieu of following the compliance test procedures of paragraphs (g)(1), (2), (3), and (4) of this sec tion. The design evaluation shall consider the vent stream co mposition, component concentrations, flow rate, relative humid ity, and temperature, and shall establish the design exhaust vent stream organic compound concentration level, capacity of t he carbon bed, type and working capacity of activated carbon used for the carbon bed, and design carbon replacement interval based on the total carbon working capacity of the control device and the emission point operating schedule. (6)(i) To demonstrate initial compliance with §63.7 45(d), §63.746(c), or §63.747(d) when hard piping or ductw ork is used to direct VOC and HAP emissions from a VOC and HAP source to the control device, each owner or operator shall demons trate upon inspection that the criteria of paragraph (g)(6)(i) (A) and paragraph (g)(6)(i) (B) or (C) of this section VR/F D are met. (A) The equipment shall be vented to a control devi ce. (B) The control device efficiency (E or H sys , as applicable) determined using equation 10 or equations 12 and 13 , respectively, and the test methods and procedures s pecified in §63.750(g)(9) through (14), shall be equal to or gr eater than the overall HAP control efficiency required by §63. 745(d), §63.746(c), or §63.747(d).Page 106 of 182

(C) When a nonregenerative carbon adsorber is used, the ductwork from the affected emission point(s) shall be vented to the control device and the carbon adsorber shall be demonstrated, through the procedures of §63.750(g) (1), (2), (3), (4), or (5), to meet the requirements of §63.7 45(d), §63.746(c), or §63.747(d). (7) Startups and shutdowns are normal operation for this source category. Emissions from these activities ar e to be included when determining if the standards specifie d in §63.745(d), §63.746(c), or §63.747(d) are being att ained. (8) An owner or operator who uses compliance techni ques other than those specified in this subpart shall su bmit a description of those compliance procedures, subject to the Administrator's approval, in accordance with §63.7( f) of subpart

A. (9) Either EPA Method 18 or EPA Method 25A of appen dix A of part 60, as appropriate to the conditions at the si te, shall be used to determine VOC and HAP concentration of air exhaust streams as required by §63.750(g)(1) through (6). T he owner or operator shall submit notice of the intended test m ethod to the Administrator for approval along with the notificat ion of the performance test required under §63.7(b). Method se lection shall be based on consideration of the diversity of organ ic species present and their total concentration and on consid eration ofPage 107 of 182

the potential presence of interfering gases. Except as indicated in paragraphs (g)(9) (i) and (ii) of this section, the test shall consist of three separate runs, each lasting a minimum of 30 minutes. (i) When either EPA Method 18 or EPA Method 25A is to be used in the determination of the efficiency of a fi xed-bed carbon adsorption system with a common exhaust stac k for all the individual carbon adsorber vessels pursuant to para graph (g) (2) or (4) of this section, the test shall consist of t hree separate runs, each coinciding with one or more complete seq uences through the adsorption cycles of all of the individ ual carbon

adsorber vessels. (ii) When either EPA Method 18 or EPA Method 25A is to be used in the determination of the efficiency of a fi xed-bed carbon adsorption system with individual exhaust st acks for each carbon adsorber vessel pursuant to §63.750(g) (3) o r (4), each carbon adsorber vessel shall be tested individually . The test for each carbon adsorber vessel shall consist of th ree separate runs. Each run shall coincide with one or more comp lete adsorption cycles. (10) EPA Method 1 or 1A of appendix A of part 60 is used for sample and velocity traverses. (11) EPA Method 2, 2A, 2C, or 2D of appendix A of p art 60 is used for velocity and volumetric flow rates.Page 108 of 182

(12) EPA Method 3 of appendix A of part 60 is used for gas analysis. (13) EPA Method 4 of appendix A of part 60 is used for stack gas moisture. (14) EPA Methods 2, 2A, 2C, 2D, 3, and 4 shall be performed, as applicable, at least twice during eac h test period. (h) Overall VOC and/or organic HAP control efficien cy— control devices other than carbon adsorbers. Calcul ate the overall control efficiency of a control system with a control device other than a carbon adsorber using the follo wing procedure. (1) Calculate the overall control efficiency using equation

15:

where: E k = overall VOC and/or organic HAP control efficienc y

(expressed as a decimal) of control system k. R k = destruction or removal efficiency (expressed as a

decimal) of total organic compounds or total organic HAP for control device k as determined under paragraph (h)(2) of this section. F k = capture efficiency (expressed as a decimal) of

capture system k as determined under paragraph (h)(3) of this section. (2) The organic HAP destruction or removal efficien cy R k of a control device other than a carbon adsorber shall bePage 109 of 182

determined using the procedures described below. Th e destruction efficiency may be measured as either total organic HAP or as TOC minus methane and ethane according to these procedu res. (i) Use Method 1 or 1A of 40 CFR part 60, appendix A, as appropriate, to select the sampling sites. (ii) Determine the gas volumetric flow rate using M ethod 2, 2A, 2C, or 2D of 40 CFR part 60, appendix A, as app ropriate. (iii) Use Method 18 of 40 CFR part 60, appendix A, to measure either TOC minus methane and ethane or tota l organic HAP. Alternatively, any other method or data that h ave been validated according to the applicable procedures in Method 301 of this part may be used. (iv) Use the following procedure to calculate the destruction or removal efficiency: (A) The destruction or removal efficiency test shal l consist of three runs. The minimum sampling time fo r each run shall be 1 hour in which either an integrated sampl e or a minimum of four grab samples shall be taken. If gra b sampling is used, the samples shall be taken at approximately e qual intervals in time such as 15-minute intervals durin g the run. (B) Calculate the mass rate of either TOC (minus me thane and ethane) or total organic HAP (E i , E o using equations 16 and

17:Page 110 of 182

where: E i , E o = mass rate of TOC (minus methane and ethane) or

total organic HAP at the inlet and outlet of the control device, respectively, dry basis, kg/hr. K 2 = constant, 2.494×10 −6 (parts per million) −1 (gram-mole

per standard cubic meter) (kilogram/gram) (minute/hour), where standard temperature for (gram-mole per standard cubic meter) is 20 °C. n = number of sample components in the gas stream. C ij , C oj = concentration of sample component j of the gas

stream at the inlet and outlet of the control device, respectively, dry basis, parts per million by volume. M ij , M oj = molecular weight of sample component j of the ga s

stream at the inlet and outlet of the control device, respectively, gram/gram-mole. Q i , Q o = flow rate of gas stream at the inlet and outlet of

the control device, respectively, dry standard cubic meter per minute.

(1) Where the mass rate of TOC is being calculated, all organic compounds (minus methane and ethane) measur ed by EPA Method 18 shall be summed using equation 16 in para graph (h)(2)(iv)(B) of this section. (2) Where the mass rate of total organic HAP is bei ng calculated, only the organic HAP species shall be s ummed using equation 17 in paragraph (h)(2)(iv)(B) of this sect ion. The list of organic HAP is provided in §63.104 of subpart F of this part.Page 111 of 182

(C) Calculate the destruction or removal efficiency for TOC (minus methane and ethane) or total organic HAP usi ng equation

18:

where: R = destruction or removal efficiency of control

device, percent. E i = mass rate of TOC (minus methane and ethane) or

total organic HAP at the inlet to the control device as calculated under paragraph (h)(2)(iv)(B) of this section, kg TOC per hour or kg organic HAP per hour. E o = mass rate of TOC (minus methane and ethane) or

total organic HAP at the outlet of the control device, as calculated under paragraph (h)(2)(iv)(B) of this section, kg TOC per hour or kg organic HAP per hour.

(3) Determine the capture efficiency F k of each capture system to which organic HAP and VOC emissions from coating operations are vented. The capture efficiency value shall be determined using Procedure T—Criteria for and Verif ication of a Permanent or Temporary Total Enclosure as found in appendix B to §52.741 of part 52 of this chapter for total enclos ures, and the capture efficiency protocol specified in §52.741(a) (4)(iii) of part 52 of this chapter for all other enclosures. (i)(1) Alternative application method—primers , topcoats , and specialty coatings. Deleted: and Deleted:

.Page 112 of 182

(i) Each owner or operator seeking to use an alternativ e application method (as allowed in § 63.745(f)(1)( v )) in complying with the standards for primers and topcoa ts shall use the procedures specified in paragraphs (i)(2)(i) an d (i)(2)(ii) or (i)(2)(iii) of this section to determine the org anic HAP and VOC emission levels of the alternative application technique as compared to either HVLP , electrostatic spray application methods, air-assisted airless application methods, or airless application methods. (ii) For specialty coatings, an owner or operator m ay use any other coating application method capable of ach ieving emission reductions or a transfer efficiency equiva lent to or better than that provided by HVLP, electrostatic sp ray, airassisted airless, or airless application. Any owner or operator using an application method pursuant to this subpar agraph shall maintain records demonstrating the transfer efficie ncy achieved

. (2)(i) For the process or processes for which the alternative application method is to be used, the t otal organic

HAP and VOC emissions shall be determined for an in itial 30-day period, the period of time required to apply coatin g to five completely assembled aircraft, or a time period app roved by the permitting agency. During this initial period, only HVLP , electrostatic spray application methods , air-assisted airless application methods, or airless application methods shall be Deleted: ix

Deleted: or

Deleted: orPage 113 of 182

used. The emissions shall be determined based on th e volumes, organic HAP contents (less water), and VOC contents (less water and exempt solvents) of the coatings as applied. (ii) Upon implementation of the alternative applica tion method, use the alternative application method in p roduction on actual production parts or assemblies for a period of time sufficient to coat an equivalent amount of parts an d assemblies with coatings identical to those used in the initia l 30-day period. The actual organic HAP and VOC emissions sh all be calculated for this post-implementation period. (iii) Test the proposed application method against either

HVLP , electrostatic spray application methods, air-assisted airless application methods, or airless application methods in a laboratory or pilot production area, using parts an d coatings representative of the process(es) where the alterna tive method is to be used. The laboratory test will use the sam e part configuration(s) and the same number of parts for b oth the proposed method and the HVLP , electrostatic spray application methods, air-assisted airless application methods, or airless application methods. (iv) Whenever the approach in either paragraph (i)( 2)(ii) or (i)(2)(iii) of this section is used, the owner o r operator shall calculate both the organic HAP and VOC emissi on reduction using equation: Deleted: or

Deleted: orPage 114 of 182

where: P = organic HAP or VOC emission reduction, percent. E b = organic HAP or VOC emissions, in pounds, before the

alternative application technique was implemented, as determined under paragraph (i)(2)(i) of this section. E a = organic HAP of VOC emissions, in pounds, after t he

alternative application technique was implemented, as determined under paragraph (i)(2)(ii) of this section. (3) Each owner or operator seeking to demonstrate t hat an alternative application method achieves emission re ductions equivalent to HVLP , electrostatic spray application methods , air-assisted airless application methods, or airles s application

methods shall comply with the following: (i) Each coating shall be applied such that the dri ed film thickness is within the range specified by the appl icable specification(s) for the aerospace vehicle or compo nent being

coated. (ii) If no such dried film thickness specification( s) exists, the owner or operator shall ensure that the dried film thickness applied during the initial 30-day period is equivalent to the dried film thickness applied during the alte rnative application method test period for similar aerospac e vehicles or components. Deleted: orPage 115 of 182

(iii) Failure to comply with these dried film thick ness requirements shall invalidate the test results obta ined under paragraph (i)(2)(i) of this section. (j) Spot stripping and decal removal. Each owner or operator seeking to comply with §63.746(b)(3) shall determine the volume of organic HAP-containing chemical strip pers or alternatively the weight of organic HAP used per ai rcraft using the procedure specified in paragraphs (j)(1) throug h (j)(3) of this section. (1) For each chemical stripper used for spot stripp ing and decal removal, determine for each annual period the total volume as applied or the total weight of organic HAP using the procedure specified in paragraph (d)(2) of this sec tion. (2) Determine the total number of aircraft for whic h depainting operations began during the annual perio d as determined from company records. (3) Calculate the annual average volume of organic HAPcontaining chemical stripper or weight of organic H AP used for spot stripping and decal removal per aircraft using equation 20 (volume) or equation 21 (weight):

where:Page 116 of 182

C = annual average volume (gal per aircraft) of org anic

HAP-containing chemical stripper used for spot stripping and decal removal. n = number of organic HAP-containing chemical strip pers

used in the annual period. V si = volume (gal) of organic HAP-containing chemical

stripper (i) used during the annual period. A = number of aircraft for which depainting operati ons

began during the annual period.

where: C = annual average weight (lb per aircraft) of orga nic

HAP (chemical stripper) used for spot stripping and decal removal. m = number of organic HAP contained in each chemica l

stripper, as applied. n = number of organic HAP-containing chemical strip pers

used in the annual period. W hi = weight fraction (expressed as a decimal) of each

organic HAP (i) contained in the chemical stripper, as applied, for each aircraft depainted. D hi = density (lb/gal) of each organic HAP-containing

chemical stripper (i), used in the annual period. V si = volume (gal) of organic HAP-containing chemical

stripper (i) used during the annual period. A = number of aircraft for which depainting operati ons

began during the annual period.

(k) Organic HAP content level determination—complia nt chemical milling maskants. For those uncontrolled c hemical milling maskants complying with the chemical millin g maskant organic HAP content limit specified in § 63.747(c)( 1) withoutPage 117 of 182

being averaged, the procedure in paragraph (k)(1) of this

section shall be used to determine the mass of organic HAP emitted per unit volume of coating (chemical millin g maskant) i as applied (less water), H i (lb/gal). As an alternative to the procedures in paragraph (k)(1) of this section, an owner or operator may use coating manufacturer’s supplied da ta to demonstrate that organic HAP emitted per volume of coating (less water), as applied, is less than or equal to the ap plicable organic HAP limit specified in § 63.747(c). Owners and operators that use the coating manufacturer’s supplied data t o demonstrate compliance based on the HAP content of the coating may add nonHAP solvent to those coatings provided that the own er or operator also maintains records of the non-HAP solv ent added to the coating. (1) For coatings that contain no exempt solvents, d etermine the total organic HAP content using manufacturer's supplied data or Method 24 of 40 CFR part 60, appendix A to deter mine the VOC content. The VOC content shall be used as a surroga te for total HAP content for coatings that contain no exempt sol vent. If there is a discrepancy between the manufacturer's f ormulation data and the results of the Method 24 analysis, com pliance shall be based on the results from the Method 24 analysis

. When Method 24 is used to determine the VOC content of water-reducible coatings, the precision adjustment factors in Deleted: following procedures

Deleted: (lb/gal).Page 118 of 182

Reference Method 24 shall be used. If the adjusted analytical

VOC content is less than the formulation solvent co ntent, then the analytical VOC content should be set equal to t he formulation solvent content. (2) [Reserved] (l) Organic HAP content level determination—average d chemical milling maskants. For those uncontrolled c hemical milling maskants that are averaged together in orde r to comply with the chemical milling maskant organic HAP conte nt level specified in §63.747(c)(1), the procedure specified in paragraphs (l)(1) through (l)(4) of this section sh all be used to determine the monthly volume-weighted average ma ss of organic HAP emitted per volume of chemical milling maskant (less water) as applied, unless the permitting agency specifies a shorter averaging period as part of an ambient ozone contro l program. (1) Determine the total organic HAP weight fraction as applied of each chemical milling maskant used durin g each 30-day period using the procedure specified in paragraph ( d)(1) of this

section. (2) Determine for each 30-day period: (i) The individual volume of each chemical milling maskant applied in terms of total gallons (less water) (usi ng the procedure specified in paragraph (d)(2) of this sec tion), andPage 119 of 182

(ii) The total volume in gallons of all chemical mi lling maskants (less water) as applied by summing the ind ividual volumes of each chemical milling maskant as applied (less water). (3) Determine the density of each chemical milling maskant as applied used during each 30-day period using the procedure specified in paragraph (d)(3) of this section. (4) Calculate the volume-weighted average mass of o rganic HAP emitted per unit volume (lb/gal) of chemical mi lling maskant (less water) as applied for all chemical milling ma skants during each 30-day period using equation 22:

where: H a = volume-weighted mass of organic HAP emitted per

unit volume of chemical milling maskants (lb/gal) (less water) as applied during each 30-day period for those chemical milling maskants being averaged. n = number of chemical milling maskants being avera ged. W Hi = weight fraction (expressed as a decimal) of orga nic

HAP in chemical milling maskant i (less water) as applied during each 30-day period that is averaged. D mi = density (lb chemical milling maskant per gal

coating) of chemical milling maskant i as applied during each 30-day period that is averaged. V mi = volume (gal) of chemical milling maskant i (less

water) as applied during the 30-day period that is averaged. M lw = total volume (gal) of all chemical milling maska ntsPage 120 of 182 (less water) as applied during each 30-day period that is averaged.

(m) VOC content level determination—compliant chemi cal milling maskants. For those uncontrolled chemical m illing maskants complying with the chemical milling maskan t VOC content limit specified in § 63.747(c)(2) without being ave raged, the procedure specified in paragraphs (m)(1) and (m)(2) of this section shall be used to determine the mass of VOC emitted per volume of chemical milling maskant (less water and exempt solvents) as applied. As an alternative to the procedures in paragraphs (m)(1) and (m)(2) of this section, an ow ner or operator may use coating manufacturer’s supplied da ta to demonstrate that VOC emitted per volume of coating (less water and exempt solvents), as applied, is less than or e qual to the applicable VOC limit specified in § 63.747(c). (1) Determine the mass of VOC emitted per unit volu me of chemical milling maskant (lb/gal) (less water and e xempt solvents) as applied, G i , for each chemical milling maskant using the procedures specified in paragraphs (e)(1) and ( e)(2) of this section. (2)(i) If the VOC content is found to be different when EPA Method 24 is used during an enforcement inspection from that used by the owner or operator in calculating G i , compliance shallPage 121 of 182

be based, except as provided in paragraph (m)(2)(ii ) of this section, upon the VOC content obtained using EPA Me thod 24. (ii) If the VOC content of a chemical milling maska nt obtained using EPA Method 24 would indicate noncomp liance as determined under §63.749(h)(3)(i), an owner or oper ator may elect to average the chemical milling maskant with other uncontrolled chemical milling maskants and (re)calc ulate G a (using the procedure specified in paragraph (n) of this section), provided appropriate and sufficient recor ds were maintained for all chemical milling maskants includ ed in the average recalculation. The (re)calculated value of G a for the averaged chemical milling maskants shall then be us ed to determine compliance. (n) VOC content level determination—averaged chemic al milling maskants. For those uncontrolled chemical m illing maskants that are averaged together in order to com ply with the chemical milling maskant VOC content limit specifie d in §63.747(c)(2), the procedure specified in paragraph s (n)(1) through (n)(4) of this section shall be used to det ermine the monthly volume-weighted average mass of VOC emitted per volume of chemical milling maskant (less water and exempt solvents) as applied, unless the permitting agency specifies a s horter averaging period as part of an ambient ozone contro l program.Page 122 of 182

(1) Determine the VOC content of each chemical mill ing maskant (less water and exempt solvents) as applied used during each 30-day period using the procedure specified in paragraph (f)(1) of this section. (2)(i) Determine the individual volume of each chem ical milling maskant applied in terms of total gallons ( less water and exempt solvents) using the procedure specified in paragraph (f)(2) of this section, and (ii) Calculate the total volume in gallons of all c hemical milling maskants (less water and exempt solvents) a s applied by summing the individual volumes of each chemical mil ling maskant (less water and exempt solvents) as applied. (3) Calculate the volume-weighted average mass of V OC emitted per unit volume (lb/gal) of chemical millin g maskant (less water and exempt solvents) as applied during each 30-day period using equation 23:

where: G a = volume-weighted average mass of VOC per unit vol ume

of chemical milling maskant (lb/gal) (less water and exempt solvents) as applied during each 30-day period for those chemical milling maskants that are averaged. n = number of chemical milling maskants being avera ged. (VOC) mi = VOC content (lb/gal) of chemical milling maskant iPage 123 of 182 (less water and exempt solvents) as applied during the 30-day period that is averaged. V mi = volume (gal) of chemical milling maskant i (less

water and exempt solvents) as applied during the 30-day period that is averaged. M lwes = total volume (gal) of all chemical milling maska nts

(less water and exempt solvents) as applied during each 30-day period that is averaged.

(4)(i) If the VOC content is found to be different when EPA Method 24 is used during an enforcement inspection from that used by the owner or operator in calculating G a , recalculation of

G a is required using the new value. If more than one chemical milling maskant is involved, the recalculation shal l be made once using all of the new values. (ii) If recalculation is required, an owner or oper ator may elect to include in the recalculation of G a uncontrolled chemical milling maskants that were not previously included provided appropriate and sufficient records were maintained for these other chemical milling maskants to allow daily reca lculations. (iii) The recalculated value of G a under either paragraph (n)(4)(i) or (n)(4)(ii) of this section shall be us ed to determine compliance. (o) Inorganic HAP emissions—dry particulate filter certification requirements. Dry particulate filters used to comply with §§ 63.745(g)(2) or 63.746(b)(4) must be certified by the filter manufacturer or distributor, paint/depai nting booth Deleted: § Deleted: §Page 124 of 182

supplier, and/or the facility owner or operator usi ng method 319 in appendix A of this part, to meet or exceed the e fficiency data points found in Tables 2 and 3 , or 4 and 5 of § 63.745 for existing or new sources respectively. § 63.751 Monitoring requirements. (a) Enclosed spray gun cleaners. Each owner or oper ator using an enclosed spray gun cleaner under §63.744(c )(1) shall visually inspect the seals and all other potential sources of leaks associated with each enclosed gun spray clean er system at least once per month. Each inspection shall occur w hile the system is in operation. (b) Incinerators and carbon adsorbers—initial compl iance demonstrations. Each owner or operator subject to t he requirements in this subpart must demonstrate initi al compliance with the requirements of §§63.745(d), 63.746(c), an d 63.747(d) of this subpart. Each owner or operator using a car bon adsorber to comply with the requirements in this subpart sha ll comply with the requirements specified in paragraphs (b)(1 ) through (7) of this section. Each owner or operator using an in cinerator to comply with the requirements in this subpart shall comply with the requirements specified in paragraphs (b)(8) thr ough (12) of this section. (1) Except as allowed by paragraph (b)(2) or (b)(5) of this section, for each control device used to control or ganic HAP or Deleted: 1 Deleted: 2 Deleted: 3 Deleted: 4Page 125 of 182

VOC emissions, the owner or operator shall fulfill the requirements of paragraph (b)(1) (i) or (ii) of thi s section. (i) The owner or operator shall establish as a site

specific operating parameter the outlet total HAP o r VOC concentration that demonstrates compliance with §63 .745(d), §63.746(c), or §63.747(d) as appropriate; or (ii) The owner or operator shall establish as the s itespecific operating parameter the control device eff iciency that demonstrates compliance with §63.745(d), §63.746(c) , or §63.747(d). (iii) When a nonregenerative carbon adsorber is use d to comply with §63.745(d), §63.746(c), or §63.747(d), the sitespecific operating parameter value may be establish ed as part of the design evaluation used to demonstrate initial c ompliance. Otherwise, the site-specific operating parameter va lue shall be established during the initial performance test con ducted according to the procedures of §63.750(g). (2) For each nonregenerative carbon adsorber, in li eu of meeting the requirements of §63.751(b)(1), the owne r or operator may establish as the site-specific operating parame ter the carbon replacement time interval, as determined by the maximum design flow rate and organic concentration in the g as stream vented to the carbon adsorption system. The carbon replacement time interval shall be established either as part o f the designPage 126 of 182

evaluation to demonstrate initial compliance or dur ing the initial performance test conducted according to the procedures in §63.750(g) (1), (2), (3), or (4). (3) Each owner or operator venting solvent HAP emis sions from a source through a room, enclosure, or hood, t o a control device to comply with §63.745(d), §63.746(c), or §6 3.747(d)

shall: (i) Submit to the Administrator with the compliance status report required by §63.9(h) of the General Provisio ns a plan

that: (A) Identifies the operating parameter to be monito red to ensure that the capture efficiency measured during the initial compliance test is maintained; (B) Discusses why this parameter is appropriate for demonstrating ongoing compliance; and (C) Identifies the specific monitoring procedures; (ii) Set the operating parameter value, or range of values, that demonstrate compliance with §63.745(d), §63.74 6(c), or §63.747(d), as appropriate; and (iii) Conduct monitoring in accordance with the pla n submitted to the Administrator unless comments rece ived from the Administrator require an alternate monitoring schem e. (4) Owners or operators subject to §63.751(b) (1), (2), or (3) shall calculate the site-specific operating par ameter value,Page 127 of 182

or range of values, as the arithmetic average of th e maximum and/or minimum operating parameter values, as appro priate, that demonstrate compliance with §63.745(d), §63.746(c), or §63.747(d) during the multiple test runs required b y §63.750 (g)(2) and (g)(1). (5) For each solvent recovery device used to comply with §63.745(d), §63.746(c), or §63.747(d), in lieu of m eeting the requirements of paragraph (b)(1) of this section, t he results of the material balance calculation conducted in accor dance with §63.750(g)(1) may serve as the site-specific operat ing parameter that demonstrates compliance with §63.745(d), §63.7 46(c), or §63.747(d). (6) Continuous compliance monitoring. Following the date on which the initial compliance demonstration is compl eted, continuous compliance with §63.745(d), §63.746(c), or §63.747(d) of this subpart shall be demonstrated as outlined i n this paragraph. (i) Each owner or operator of an affected source su bject to §63.745(d), §63.746(c), or §63.747(d) of this subpa rt shall monitor the applicable parameters specified in para graph (b)(6)(ii), (b)(6)(iii), or (b)(6)(iv) of this sect ion depending on the type of control technique used. (ii) Compliance monitoring shall be subject to the following provisions:Page 128 of 182

(A) Except as allowed by paragraph (b)(6)(iii)(A)( 2 ) of this section, all continuous emission monitors shal l comply with performance specification (PS) 8 or 9 in 40 CFR par t 60, appendix B, as appropriate depending on whether VOC or HAP concentration is being measured. The requirements i n appendix F of 40 CFR part 60 shall also be followed. In conduc ting the quarterly audits required by appendix F, owners or operators shall challenge the monitors with compounds represe ntative of the gaseous emission stream being controlled. (B) If the effluent from multiple emission points a re combined prior to being channeled to a common contr ol device, the owner or operator is required only to monitor t he common control device, not each emission point. (iii) Owners or operators complying with §63.745(d) , §63.746(c), or §63.747(d) through the use of a cont rol device and establishing a site-specific operating paramete r in accordance with paragraph (b)(1) of this section sh all fulfill the requirements of paragraph (b)(6)(iii)(A) of thi s section and paragraph (b)(6)(iii)(B) or (C) of this section, as appropriate. (A) The owner or operator shall install, calibrate, operate, and maintain a continuous emission monitor

. ( 1 ) The continuous emission monitor shall be used to measure continuously the total HAP or VOC concentra tion at both the inlet and the outlet whenever HAP from coating and paintPage 129 of 182

stripping operations are vented to the control devi ce, or when continuous compliance is demonstrated through a per cent efficiency calculation; or ( 2 ) For owners or operators using a nonregenerative c arbon adsorber, in lieu of using continuous emission moni tors as specified in paragraph (b)(6)(iii)(A)( 1 ) of this section, the owner or operator may use a portable monitoring dev ice to monitor total HAP or VOC concentration at the inlet and outlet or the outlet of the carbon adsorber as appropriate

. ( a ) The monitoring device shall be calibrated, operat ed, and maintained in accordance with the manufacturer' s specifications. ( b ) The monitoring device shall meet the requirements of part 60, appendix A, Method 21, sections 2, 3, 4.1, 4.2, and 4.4. The calibration gas shall either be representa tive of the compounds to be measured or shall be methane, and s hall be at a concentration associated with 125% of the expected organic compound concentration level for the carbon adsorbe r outlet

vent. ( c ) The probe inlet of the monitoring device shall be placed at approximately the center of the carbon ad sorber outlet vent. The probe shall be held there for at least 5 minutes during which flow into the carbon adsorber is expec ted to occur.Page 130 of 182

The maximum reading during that period shall be use d as the

measurement. (B) If complying with §63.745(d), §63.746(c), or §6 3.747(d) through the use of a carbon adsorption system with a common exhaust stack for all of the carbon vessels, the ow ner or operator shall not operate the control device at an average control efficiency less than that required by §63.7 45(d), §63.746(c), or §63.747(d) for three consecutive ads orption cycles. (C) If complying with §63.745(d), §63.746(c), or §6 3.747(d) through the use of a carbon adsorption system with individual exhaust stacks for each of the multiple carbon adso rber vessels, the owner or operator shall not operate any carbon adsorber vessel at an average control efficiency less than t hat required by §63.745(d), §63.746(c), or §63.747(d) as calcula ted daily using a 7 to 30-day rolling average. (D) If complying with §63.745(d), §63.746(c), or §6 3.747(d) through the use of a nonregenerative carbon adsorbe r, in lieu of the requirements of paragraph (b)(6)(iii) (B) or (C ) of this section, the owner or operator may monitor the VOC or HAP concentration of the adsorber exhaust daily, at int ervals no greater than 20 percent of the design carbon replac ement interval, whichever is greater, or at a frequency a s determined by the owner or operator and approved by the Admini strator.Page 131 of 182

(iv) Owners or operators complying with §63.745(d), §63.746(c), or §63.747(d) through the use of a nonr egenerative carbon adsorber and establishing a site-specific op erating parameter for the carbon replacement time interval in accordance with paragraph (b)(2) shall replace the carbon in t he carbon adsorber system with fresh carbon at the predetermi ned time interval as determined in the design evaluation. (v) Owners or operators complying with §63.745(d), §63.746(c), or §63.747(d) by capturing emissions th rough a room, enclosure, or hood shall install, calibrate, operat e, and maintain the instrumentation necessary to measure c ontinuously the site-specific operating parameter established i n accordance with paragraph (b)(3) of this section whenever VOC and HAP from coating and stripper operations are vented through the capture device. The capture device shall not be operated at an average value greater than or less than (as appropriate) th e operating parameter value established in accordance with para graph (b)(3) of this section for any 3-hour period. (7) Owners or operators complying with paragraph (b )(4) or (b)(5) of this section shall calculate the site-spe cific operating parameter value as the arithmetic average of the minimum operating parameter values that demonstrate compliance with §63.745(d)and §63.747(d) during the three test runs required by §63.750(h)(2)(iv).Page 132 of 182

(8) All temperature monitoring equipment shall be installed, calibrated, maintained, and operated acc ording to manufacturer's specifications. Every 3 months, faci lities shall replace the temperature sensors or have the tempera ture sensors recalibrated. As an alternative, a facility may use a continuous emission monitoring system (CEMS) to verify that th ere has been no change in the destruction efficiency and effluen t composition of the incinerator. (9) Where an incinerator other than a catalytic inc inerator is used, a thermocouple equipped with a continuous recorder shall be installed and continuously operated in the firebox or in the ductwork immediately downstream of the fireb ox in a position before any substantial heat exchange occur s. (10) Where a catalytic incinerator is used, thermoc ouples, each equipped with a continuous recorder, shall be installed and continuously operated in the gas stream immediately before and after the catalyst bed. (11) For each incinerator other than a catalytic incinerator, each owner or operator shall establish during each performance test during which compliance is demonst rated, including the initial performance test, the minimum combustion temperature as a site-specific operating parameter. This minimum combustion temperature shall be the operating param eter value that demonstrates compliance with §§63.745(d) and 6 3.747(d).Page 133 of 182

(12) For each catalytic incinerator, each owner or operator shall establish during each performance test during which compliance is demonstrated, including the initial p erformance test, the minimum gas temperature upstream of the c atalyst bed and the minimum gas temperature difference across t he catalyst bed as site-specific operating parameters. These mi nimum temperatures shall be the operating parameter value s that demonstrate compliance with §§63.745(d) and 63.747( d). (c) Dry particulate filter, HEPA filter, and waterw ash systems—primer , topcoat , and specialty coating application operations. (1) Each owner or operator using a dry particulate filter system to meet the requirements of § 63.745( g)(2) shall, while primer , topcoat , and specialty coating application operations are occurring, continuously monitor the pressure drop across the system and read and record the pressure drop once per shift following the recordkeeping requirements of § 63.752(d) , or install an interlock system as specified in § 63.745(g)(2)(iv)(C ). (2) Each owner or operator using a conventional wat erwash system to meet the requirements of § 63.745(g)(2) s hall, while primer or topcoat application operations are occurr ing, continuously monitor the water flow rate through th e system and read and record the water flow rate once per shift following the recordkeeping requirements of § 63.752(d ), or install an Deleted: and

Deleted: or

Deleted: ).Page 134 of 182

interlock system as specified in § 63.745(g)(2)(v). Each owner or operator using a pumpless waterwash system to me et the requirements of § 63.745(g)(2) shall, while primer , topcoat , or specialty coating application operations are occurring, measure and record the parameter(s) recommended by the boot h manufacturer that indicate booth performance once p er shift, following the recordkeeping requirements of § 63.75 2(d ), or install an interlock system as specified in § 63.74 5(g)(2)(v ). (d) Particulate filters and waterwash booths—depain ting operations. Each owner or operator using a dry part iculate filter or a conventional waterwash system in accord ance with the requirements of §63.746(b)(4) shall, while depainti ng operations are occurring, continuously monitor the pressure dr op across the particulate filters or the water flow rate through the conventional waterwash system and read and record t he pressure drop or the water flow rate once per shift followin g the recordkeeping requirements of §63.752(e). Each owne r or operator using a pumpless waterwash system to meet the requi rements of §63.746(b)(4) shall, while depainting operations ar e occurring, measure and record the parameter(s) recommended by the booth manufacturer that indicate booth performance once p er shift, following the recordkeeping requirements of §63.752 (e). (e) Use of an alternative monitoring method—(1) Gen eral. Until permission to use an alternative monitoring m ethod has Deleted: andPage 135 of 182

been granted by the Administrator under this paragr aph, the owner or operator of an affected source shall remai n subject to the requirements of this section. (2) After receipt and consideration of written appl ication, the Administrator may approve alternatives to any m onitoring methods or procedures of this section including, bu t not limited to, the following: (i) Alternative monitoring requirements when the af fected source is infrequently operated; or (ii) Alternative locations for installing continuou s monitoring systems when the owner or operator can d emonstrate that installation at alternate locations will enabl e accurate and representative measurements; or (iii) Alternatives to the American Society for Test ing and Materials (ASTM) test methods or sampling procedure s specified in this section. (3) If the Administrator finds reasonable grounds t o dispute the results obtained by an alternative moni toring method, requirement, or procedure, the Administrato r may require the use of a method, requirement, or procedure spec ified in this section. If the results of the specified and the al ternative method, requirement, or procedure do not agree, the results obtained by the specified method, requirement, or p rocedure shall prevail.Page 136 of 182

(4)(i) Request to use alternative monitoring method . An owner or operator who wishes to use an alternative monitoring method shall submit an application to the Administr ator as described in paragraph (e)(4)(ii) of this section. The application may be submitted at any time provided t hat the monitoring method is not used to demonstrate compli ance with a relevant standard or other requirement. If the alte rnative monitoring method is to be used to demonstrate comp liance with a relevant standard, the application shall be submitt ed not later than with the site-specific test plan required in § 63.7(c) (if requested) or with the site-specific performance ev aluation plan (if requested), or at least 60 days before the perf ormance evaluation is scheduled to begin. (ii) The application shall contain a description of the proposed alternative monitoring system and informat ion justifying the owner's or operator's request for an alternative monitoring method, such as the technical or economi c infeasibility, or the impracticality, of the affect ed source using the required method. (iii) The owner or operator may submit the informat ion required in this paragraph well in advance of the s ubmittal dates specified in paragraph (e)(4)(i) of this sect ion to ensure a timely review by the Administrator in order to me et the compliance demonstration date specified in this sub part.Page 137 of 182

(5) Approval of request to use alternative monitori ng method. (i) The Administrator will notify the owner or operator of his/her intention to deny approval of the reques t to use an alternative monitoring method within 60 calendar da ys after receipt of the original request and within 60 calen dar days after receipt of any supplementary information that is submitted. If notification of intent to deny approv al is not received within 60 calendar days, the alternative m onitoring method is to be considered approved. Before disappr oving any request to use an alternative monitoring method, th e Administrator will notify the applicant of the Admi nistrator's intent to disapprove the request together with: (A) Notice of the information and findings on which the intended disapproval is based; and (B) Notice of opportunity for the owner or operator to present additional information to the Administrator before final action on the request. At the time the Administrato r notifies the applicant of his or her intention to disapprove the request, the Administrator will specify how much time the ow ner or operator will have after being notified of the inte nded disapproval to submit the additional information. (ii) If the Administrator approves the use of an alternative monitoring method for an affected sourc e under paragraph (e)(5)(i) of this section, the owner or o perator ofPage 138 of 182

such source shall continue to use the alternative m onitoring method until approval is received from the Administ rator to use another monitoring method as allowed by paragraph ( e) of this section. (f) Reduction of monitoring data. (1) The data may be recorded in reduced or nonreduced form (e.g., parts per million (ppm) pollutant and % O 2 or nanograms per Joule (ng/J) of pollutant). (2) All emission data shall be converted into units specified in this subpart for reporting purposes. A fter conversion into units specified in this subpart, th e data may be rounded to the same number of significant digits as used in this subpart to specify the emission limit (e.g., rounde d to the nearest 1% overall reduction efficiency). § 63.752 Recordkeeping requirements. (a) General. Each owner or operator of a source sub ject to this subpart shall fulfill all recordkeeping requir ements specified in § 63.10 (a), (b), (d), and (f) , except § 63.10(b)(2)(i), (iv) and (v). Each owner or operato r must also record and maintain, according to § 63.10(b)(1), th e information specified in paragraph (a)(1) through (a)(3) of thi s section

. (1) In the event that an affected unit fails to mee t an applicable standard, record the number of failures. For each failure record the date, time, and duration of each failure.Page 139 of 182

(2) For each failure to meet an applicable standard , record and retain a list of the affected sources or equipm ent, an estimate of the quantity of each regulated pollutan t emitted over any emission limit and a description of the me thod used to estimate the emissions. (3) Record actions taken to minimize emissions in accordance with § 63.743(e), and any corrective act ions taken to return the affected unit to its normal or usual man ner of operation. (b) Cleaning operation. Each owner or operator of a new or existing cleaning operation subject to this subpart shall record the information specified in paragraphs (b)(1) thro ugh (b)(5) of this section, as appropriate. (1) The name, vapor pressure, and documentation sho wing the organic HAP constituents of each cleaning solvent u sed for affected cleaning operations at the facility. (2) For each cleaning solvent used in hand-wipe cle aning operations that complies with the composition requi rements specified in §63.744(b)(1) or for semi-aqueous clea ning solvents used for flush cleaning operations: (i) The name of each cleaning solvent used; (ii) All data and calculations that demonstrate tha t the cleaning solvent complies with one of the compositi on requirements; andPage 140 of 182

(iii) Annual records of the volume of each solvent used, as determined from facility purchase records or usage records. (3) For each cleaning solvent used in hand-wipe cle aning operations that does not comply with the compositio n requirements in §63.744(b)(1), but does comply with the vapor pressure requirement in §63.744(b)(2): (i) The name of each cleaning solvent used; (ii) The composite vapor pressure of each cleaning solvent used; (iii) All vapor pressure test results, if appropria te, data, and calculations used to determine the compos ite vapor pressure of each cleaning solvent; and (iv) The amount (in gallons) of each cleaning solve nt used each month at each operation. (4) For each cleaning solvent used for the exempt h and-wipe cleaning operations specified in §63.744(e) that do es not conform to the vapor pressure or composition requir ements of §63.744(b): (i) The identity and amount (in gallons) of each cl eaning solvent used each month at each operation; and (ii) A list of the processes set forth in §63.744(e ) to which the cleaning operation applies.Page 141 of 182

(5) A record of all leaks from enclosed spray gun c leaners identified pursuant to §63.751(a) that includes for each leak

found: (i) Source identification; (ii) Date leak was discovered; and (iii) Date leak was repaired. (c) Primer , topcoat , and specialty coating application operations—organic HAP and VOC. Each owner or opera tor required to comply with the organic HAP and VOC content limi ts specified in § 63.745(c) shall record the information specifi ed in paragraphs (c)(1) through (c)(6) of this section, a s appropriate. Each owner and operator using coating manufacturer’s supplied data to demonstrate complia nce with the applicable organic HAP or VOC limit specified in § 63.745(c) may retain the manufacturer’s documentation and annual purchase records in place of the records specified in paragr aphs (c)(2) and (c)(3) of this section. Owners and operators us ing the coating manufacturer’s supplied data to demonstrate compliance based on the HAP content of the coating, and adding non-HAP solvent to those coatings, must also maintain recor ds of the non-HAP solvent added to the coating. (1) The name and VOC content as received and as app lied of each primer , topcoat , and specialty coating used at the facility. Deleted: and

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(2) For uncontrolled primers , topcoats , and specialty coatings that meet the organic HAP and VOC content limits i n §63.745(c)(1) through (c)( 6 ) without averaging: (i) The mass of organic HAP emitted per unit volume of coating as applied (less water) (H i ) and the mass of VOC emitted per unit volume of coating as applied (less water a nd exempt solvents) (G i ) for each coating formulation within each coating category used each month (as calculated using the p rocedures specified in §63.750(c) and (e)); (ii) All data, calculations, and test results (incl uding EPA Method 24 results) used in determining the valu es of H i and

G i ; and (iii) The volume (gal) of each coating formulation within each coating category used each month. (3) For “low HAP content” uncontrolled primers with organic HAP content less than or equal to 250 g/l (2.1 lb/g al) less water as applied and VOC content less than or equal to 250 g/l (2.1 lb/gal) less water and exempt solvents as appl ied: (i) Annual purchase records of the total volume of each primer purchased; and (ii) All data, calculations, and test results (incl uding EPA Method 24 results) used in determining the orga nic HAP and VOC content as applied. These records shall consist of the manufacturer's certification when the primer is app lied as Deleted: and

Deleted: 4Page 143 of 182

received, or the data and calculations used to dete rmine H i if not applied as received. (4) For primers , topcoats , and specialty coatings complying with the organic HAP or VOC content level by averag ing: (i) The monthly volume-weighted average masses of o rganic HAP emitted per unit volume of coating as applied ( less water) (H a ) and of VOC emitted per unit volume of coating as applied (less water and exempt solvents) (G a ) for all coatings (as determined by the procedures specified in §63.750(d ) and (f));

and (ii) All data, calculations, and test results (incl uding EPA Method 24 results) used to determine the values of H a and G a . (5) For primers , topcoats , and specialty coatings that are controlled by a control device other than a carbon adsorber: (i) The overall control efficiency of the control s ystem (as determined using the procedures specified in §6 3.750(h)) and all test results, data, and calculations used in de termining the overall control efficiency; (ii) If an incinerator other than a catalytic incin erator is used, continuous records of the firebox temperat ure recorded under §63.751(b)(9) and all calculated 3-hour avera ges of the firebox temperature; and Deleted: and

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(iii) If a catalytic incinerator is used, continuou s records of the temperature recorded under §63.751(b )(10) and all calculated 3-hour averages of the recorded temperat ures. (6) For primers, topcoats , and specialty coatings that are controlled by a carbon adsorber: (i) The overall control efficiency of the control s ystem (as determined using the procedures specified in §6 3.750(g)) and all test results, data, and calculations used in de termining the overall control efficiency. The length of the rolli ng material balance period and all data and calculations used f or determining this rolling period. The record of the certification of the accuracy of the device that measures the amo unt of HAP or VOC recovered; or (ii) For nonregenerative carbon adsorbers, the over all control efficiency of the control system (as determ ined using the procedures specified in §63.750(g)) and all tes t results, data, and calculations used in determining the over all control efficiency. The record of the carbon replacement ti me established as the site-specific operating paramete r to demonstrate compliance. (d) Primer , topcoat , and specialty coating application operations—inorganic HAP emissions. (1) Each owner or operator complying with § 63.745(g) for the control of inorg anic HAP emissions from primer , topcoat , and specialty coating Deleted: primer and

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application operations through the use of a dry par ticulate filter system or a HEPA filter system shall record the pressure drop across the operating system once each shift du ring which coating operations occur. (2) Each owner or operator complying with §63.745(g ) through the use of a conventional waterwash system shall record the water flow rate through the operating system on ce each shift during which coating operations occur. Each owner o r operator complying with §63.745(g) through the use of a pump less waterwash system shall record the parameter(s) reco mmended by the booth manufacturer that indicate the performanc e of the booth once each shift during which coating operatio ns occur. (3) This log shall include the acceptable limit(s) of pressure drop, water flow rate, or for the pumpless waterwash booth, the booth manufacturer recommended parameter (s) that indicate the booth performance, as applicable, as s pecified by the filter or booth manufacturer or in locally prep ared operating procedures. (e) Depainting operations. Each owner or operator s ubject to the depainting standards specified in §63.746 sh all record the information specified in paragraphs (e)(1) thro ugh (e)(7) of this section, as appropriate. (1) General. For all chemical strippers used in the depainting operation:Page 146 of 182

(i) The name of each chemical stripper; and (ii) Monthly volumes of each organic HAP containing chemical stripper used or monthly weight of organic HAP-material used for spot stripping and decal removal. (2) For HAP-containing chemical strippers that are controlled by a carbon adsorber: (i) The overall control efficiency of the control s ystem (as determined using the procedures specified in §6 3.750(g)) and all test results, data, and calculations used in de termining the overall control efficiency. The length of the rolli ng material balance period and all data and calculations used f or determining this rolling period. The record of the certification of the accuracy of the device that measures the amo unt of HAP or VOC recovered; or (ii) For nonregenerative carbon adsorbers, the over all control efficiency of the control system (as determ ined using the procedures specified in §63.750(g)) and all tes t results, data, and calculations used in determining the over all control efficiency. The record of the carbon replacement ti me established as the site-specific operating paramete r to demonstrate compliance. (3) For HAP-containing chemical strippers that are controlled by a control device other than a carbon adsorber:Page 147 of 182

(i) The overall control efficiency of the control s ystem (as determined using the procedures specified in §6 3.750(h)) and all test results, data, and calculations used in de termining the overall control efficiency; (ii) [Reserved] (4) For each type of aircraft depainted at the faci lity, a listing of the parts, subassemblies, and assemblies normally removed from the aircraft before depainting. Protot ype, test model or aircraft that exist in low numbers (i.e., less than 25 aircraft of any one type) are exempt from this requ irement. (5) Non-chemical based equipment. If dry media blas ting equipment is used to comply with the organic HAP em ission limit specified in §63.746(b)(1): (i) The names and types of non-chemical based equip ment;

and (ii) For periods of malfunction, (A) The non-chemical method or technique that malfunctioned; (B) The date that the malfunction occurred; (C) A description of the malfunction; (D) The methods used to depaint aerospace vehicles during the malfunction period; (E) The dates that these methods were begun and discontinued; andPage 148 of 182

(F) The date that the malfunction was corrected. (6) Spot stripping and decal removal. For spot stri pping and decal removal, the volume of organic HAP-contai ning chemical stripper or weight of organic HAP used, the annual average volume of organic HAP-containing chemical stripper or weight of organic HAP used per aircraft, the annual number of aircraft stripped, and all data and calculations used. (7) Inorganic HAP emissions. Each owner or operator shall record the actual pressure drop across the particul ate filters or the visual continuity of the water curtain and w ater flow rate for conventional waterwash systems once each s hift in which the depainting process is in operation. For pumples s waterwash systems, the owner or operator shall record the par ameter(s) recommended by the booth manufacturer that indicate the performance of the booth once per shift in which th e depainting process is in operation. This log shall include the acceptable limit(s) of the pressure drop as specified by the f ilter manufacturer, the visual continuity of the water cu rtain and the water flow rate for conventional waterwash systems, or the recommended parameter(s) that indicate the booth pe rformance for pumpless systems as specified by the booth manufact urer or in locally prepared operating procedures. (f) Chemical milling maskant application operations . Each owner or operator seeking to comply with the organi c HAP and VOCPage 149 of 182

content limits for the chemical milling maskant app lication operation, as specified in § 63.747(c), or the cont rol system requirements specified in § 63.747(d), shall record the information specified in paragraphs (f)(1) through (f)(4) of this section, as appropriate. Each owner and operator using coating manufacturer’s supplied data to demonstrate compliance with the applicable organic HAP or VOC limit specif ied in § 63.747(c) may retain the manufacturer’s documentati on and annual purchase records in place of the records specified in paragraph (f)(1) of this section. Owners and operators using the coating manufacturer’s supplied data to demonstrate complia nce based on the HAP content of the coating, and adding non-HAP solvent to those coatings, must also maintain records of the n on-HAP solvent added to the coating. (1) For uncontrolled chemical milling maskants that meet the organic HAP or VOC content limit without averag ing: (i) The mass of organic HAP emitted per unit volume of chemical milling maskant as applied (less water) (H i ) and the mass of VOC emitted per unit volume of chemical mil ling maskant as applied (less water and exempt solvents) (G i ) for each chemical milling maskant formulation used each mont h (as determined by the procedures specified in §63.750 ( k) and (m));Page 150 of 182

(ii) All data, calculations, and test results (incl uding EPA Method 24 results) used in determining the valu es of H i and

G i ; and (iii) The volume (gal) of each chemical milling mas kant formulation used each month. (2) For chemical milling maskants complying with th e organic HAP or VOC content level by averaging: (i) The monthly volume-weighted average masses of o rganic HAP emitted per unit volume of chemical milling mas kant as applied (less water) (H a ) and of VOC emitted per unit volume of chemical milling maskant as applied (less water and exempt solvents) (G a ) for all chemical milling maskants (as determined by the procedures specified in §63.750 (l) and (n)) ; and (ii) All data, calculations, and test results (incl uding EPA Method 24 results) used to determine the values of H a and G a . (3) For chemical milling maskants that are controll ed by a

carbon adsorber: (i) The overall control efficiency of the control s ystem (as determined using the procedures specified in §6 3.750(g)) and all test results, data, and calculations used in de termining the overall control efficiency. The length of the rolli ng material balance period and all data and calculations used f or determining this rolling period. The record of the certificationPage 151 of 182

of the accuracy of the device that measures the amo unt of HAP or VOC recovered; or (ii) For nonregenerative carbon adsorbers, the over all control efficiency of the control system (as determ ined using the procedures specified in §63.750(g)) and all tes t results, data, and calculations used in determining the over all control efficiency. The record of the carbon replacement ti me established as the site-specific operating paramete r to demonstrate compliance. (4) For chemical milling maskants that are controll ed by a control device other than a carbon adsorber: (i) The overall control efficiency of the control s ystem (as determined using the procedures specified in §6 3.750(h)) and all test results, data, and calculations used in de termining the overall control efficiency; (ii) If an incinerator other than a catalytic incin erator is used, continuous records of the firebox temperat ure recorded under §63.751(b)(9) and all calculated 3-hour avera ges of the firebox temperature; and (iii) If a catalytic incinerator is used, continuou s records of the temperature recorded under §63.751(b )(10) and all calculated 3-hour averages of the recorded temperat ures. § 63.753 Reporting requirements.Page 152 of 182

(a)(1) Except as provided in paragraphs (a)(2) through (a)( 5 ) of this section, each owner or operator subject t o this subpart shall fulfill the requirements contained in § 63.9(a) through (e) and (h) through (j), Notification requi rements, and § 63.10(a), (b), (d), and (f), Recordkeeping and re porting requirements, of the General Provisions, 40 CFR par t 63, subpart A, and that the initial notification for existing s ources required in § 63.9(b)(2) shall be submitted not lat er than September 1, 1997 , or as specified in § 63.9(b)(2). In addition to the requirements of § 63.9(h), the notification of compliance status shall include: (i) Information detailing whether the source has op erated within the specified ranges of its designated opera ting parameters. (ii) For each coating line, where averaging will be used along with the types of quantities of coatings the facility expects to use in the first year of operation. Aver aging scheme shall be approved by the Administrator or delegated State authority and shall be included as part of the faci lity's title V or part 70 permit. (2) The initial notification for existing sources, required in § 63.9(b)(2) shall be submitted no later than Se ptember 1,

1997 , or as specified in § 63.9(b)(2). For the purposes of this subpart, a title V or part 70 permit application ma y be used in Deleted: and

Deleted: 3

Deleted:

.

Deleted:

.Page 153 of 182

lieu of the initial notification required under § 6 3.9(b)(2), provided the same information is contained in the p ermit application as required by § 63.9(b)(2), and the St ate to which the permit application has been submitted has an ap proved operating permit program under part 70 of this chap ter and has received delegation of authority from the EPA. Perm it applications shall be submitted by the same due dat es as those specified for the initial notifications. (3) For the purposes of this subpart, the Administr ator will notify the owner or operator in writing of app roval or disapproval of the request for an adjustment to a p articular time period or postmark deadline submitted under §6 3.9(i) within 30 calendar days of receiving sufficient informatio n to evaluate the request, rather than 15 calendar days as provid ed for in §63.9(i)(3). (4) Each owner or operator subject to this subpart is not required to comply with § 63.10(b)(2)(i), (b)(2)(iv ), (b)(2)(v), and (d)(5). (5) If a source fails to meet an applicable standar d specified in §§ 63.744 through 63.748, report such events in the semiannual report: (i) The number of failures to meet an applicable st andard. (ii) For each instance, report the date, time, and duration

of each failure.Page 154 of 182

(iii) For each failure the report must include a li st of the affected sources or equipment, an estimate of t he quantity of each regulated pollutant emitted over any emissi on limit, and a description of the method used to estimate the em issions. (b) Cleaning operation. Each owner or operator of a cleaning operation subject to this subpart shall su bmit the following information: (1) Semiannual reports occurring every 6 months fro m the date of the notification of compliance status that identify: (i) Any instance where a noncompliant cleaning solv ent is used for a non-exempt hand-wipe cleaning operation; (ii) A list of any new cleaning solvents used for h and-wipe cleaning in the previous 6 months and, as appropria te, their composite vapor pressure or notification that they comply with the composition requirements specified in §63.744(b )(1); (iii) Any instance where a noncompliant spray gun c leaning method is used; (iv) Any instance where a leaking enclosed spray gu n cleaner remains unrepaired and in use for more than 15 days; and (v) If the operations have been in compliance for t he semiannual period, a statement that the cleaning op erations have been in compliance with the applicable standards. S ources shall also submit a statement of compliance signed by a r esponsiblePage 155 of 182

company official certifying that the facility is in compliance with all applicable requirements. (c) Primer , topcoat , and specialty coating application operations. Each owner or operator of a primer or t opcoat application operation subject to this subpart shall submit the following information: (1) Semiannual reports occurring every 6 months fro m the date of the notification of compliance status that identify: (i) For primers , topcoats , and specialty coatings where compliance is not being achieved through the use of averaging or a control device, the HAP or VOC content in manufacturer’s supplied data as recorded under § 63.752(c), or each value of H i and G i , as recorded under §63.752(c)(2)(i), that exceeds the applicable organic HAP or VOC content limit specifi ed in § 63.745(c); (ii) For primers , topcoats , and specialty coatings where compliance is being achieved through the use of ave raging, each

value of H a and G a , as recorded under § 63.752(c)(4)(i), that exceeds the applicable organic HAP or VOC content l imit specified in § 63.745(c); (iii) If incinerators are used to comply with the standards, all periods when the 3-hour average comb ustion temperature(s) is (are) less than the average combu stion temperature(s) established under §63.751(b) (11) or (12) during Deleted: and

Deleted: and

Deleted: andPage 156 of 182

the most recent performance test during which compl iance was demonstrated; (iv) If a carbon adsorber is used; (A) each rolling period when the overall control ef ficiency of the control system is calculated to be less than 81%, the initial material balance calculation, and any excee dances as demonstrated through the calculation; or, (B) for nonregenerative carbon adsorbers, submit th e design evaluation, the continuous monitoring system perfor mance report, and any excess emissions as demonstrated through de viations of monitored values. (v) For control devices other than an incinerator o r carbon adsorber, each exceedance of the operating paramete r(s) established for the control device under the initia l performance test during which compliance was demonstrated; (vi) All times when a primer or topcoat application operation was not immediately shut down when the pr essure drop across a dry particulate filter or HEPA filter syst em, the water flow rate through a conventional waterwash system, or the recommended parameter(s) that indicate the booth pe rformance for pumpless systems, as appropriate, was outside the l imit(s) specified by the filter or booth manufacturer or in locally prepared operating procedures;Page 157 of 182

(vii) If the operations have been in compliance for the semiannual period, a statement that the operations have been in compliance with the applicable standards; and, (2) Annual reports beginning 12 months after the da te of the notification of compliance status listing the n umber of times the pressure drop or water flow rate for each dry filter or waterwash system, as applicable, was outside the limit(s) specified by the filter or booth manufacturer or in locally prepared operating procedures. (d) Depainting operation. Each owner or operator of a depainting operation subject to this subpart shall submit the following information: (1) Semiannual reports occurring every 6 months fro m the date of the notification of compliance status that identify: (i) Any 24-hour period where organic HAP were emitt ed from the depainting of aerospace vehicles, other than fr om the exempt operations listed in §63.746 (a), (b)(3), and (b)(5 ). (ii) Any new chemical strippers used at the facilit y during the reporting period; (iii) The organic HAP content of these new chemical strippers; (iv) For each chemical stripper that undergoes reformulation, its organic HAP content;Page 158 of 182

(v) Any new non-chemical depainting technique in us e at the facility since the notification of compliance statu s or any subsequent semiannual report was filed; (vi) For periods of malfunctions: (A) The non-chemical method or technique that malfunctioned; (B) The date that the malfunction occurred; (C) A description of the malfunction; (D) The methods used to depaint aerospace vehicles during the malfunction period; (E) The dates that these methods were begun and discontinued; and (F) The date that the malfunction was corrected; (vii) All periods where a nonchemical depainting op eration subject to §63.746(b)(2) and (b)(4) for the control of inorganic HAP emissions was not immediately shut down when th e pressure drop, water flow rate, or recommended booth paramet er(s) was outside the limit(s) specified by the filter or boo th manufacturer or in locally prepared operational pro cedures; (viii) A list of new and discontinued aircraft mode ls depainted at the facility over the last 6 months an d a list of the parts normally removed for depainting for each new aircraft model being depainted; andPage 159 of 182

(ix) If the depainting operation has been in compli ance for the semiannual period, a statement signed by a resp onsible company official that the operation was in complian ce with the applicable standards. (2) Annual reports occurring every 12 months from t he date of the notification of compliance status that ident ify:(i) The average volume per aircraft of organic HAPcontaining chemical strippers or weight of organic HAP used for spot stripping and decal removal operations if it e xceeds the limits specified in §63.746(b)(3); and (ii) The number of times the pressure drop limit(s) for each filter system or the number of times the water flow rate limit(s) for each waterwash system were outside the limit(s) specified by the filter or booth manufacturer or in locally prepared operating procedures. (3) Where a control device is used to control organ ic HAP emissions, semiannual reports that identify: (i) If a carbon adsorber is used, (A) each rolling period when the overall control ef ficiency of the control system is calculated to be less than 81% for existing systems or less than 95% for new systems, the initial material balance calculation, and any exceedances a s demonstrated through the calculation; or,Page 160 of 182

(B) for nonregenerative carbon adsorbers, submit th e design evaluation, the continuous monitoring system perfor mance report, and any excess emissions as demonstrated through de viations of monitored values. (ii) For control devices other than a carbon adsorb er, each exceedance of the operating parameter(s) establishe d for the control device under the initial performance test d uring which compliance was demonstrated; (iii) Descriptions of any control devices currently in use that were not listed in the notification of complia nce status or any subsequent report. (e) Chemical milling maskant application operation. Each owner or operator of a chemical milling maskant app lication operation subject to this subpart shall submit semi annual reports occurring every 6 months from the date of t he notification of compliance status that identify: (1) For chemical milling maskants where compliance is not being achieved through the use of averaging or a co ntrol device, the HAP or VOC content in manufacturer’s supplied d ata as recorded under § 63.752(f), or each value of H i and G i , as recorded under § 63.752(f)(1)(i), that exceeds the applicable organic HAP or VOC content limit specified in § 63. 747(c); (2) For chemical milling maskants where compliance is being achieved through the use of averaging, each value o f H a and G a ,Page 161 of 182

as recorded under §63.752(f)(2)(i), that exceeds th e applicable organic HAP or VOC content limit specified in §63.7 47(c); (3) Where a control device is used, (i) If incinerators are used to comply with the sta ndards, all periods when the 3-hour average combustion temp erature(s) is (are) less than the average combustion temperature( s) established under §63.751(b) (11) or (12) during th e most recent performance test during which compliance was demons trated; (ii) If a carbon adsorber is used, (A) Each rolling period when the overall control ef ficiency of the control system is calculated to be less than 81%, the initial material balance calculation, and any excee dances as demonstrated through the calculation; or, (B) For nonregenerative carbon adsorbers, submit th e design evaluation, the continuous monitoring system perfor mance report, and any excess emissions as demonstrated through de viations of

monitored values. (iii) For control devices other than an incinerator or carbon adsorber, each exceedance of the operating p arameter(s) established for the control device under the initia l performance test during which compliance was demonstrated; (4) All chemical milling maskants currently in use that were not listed in the notification of compliance s tatus or any other subsequent semiannual report;Page 162 of 182

(5) Descriptions of any control devices currently i n use that were not listed in the notification of complia nce status or any subsequent report; and (6) If the operations have been in compliance for t he semiannual period, a statement that the chemical mi lling maskant application operation has been in compliance with t he applicable

standards. (f) Within 60 days after the date of completing eac h performance test (as defined in § 63.2) required by this subpart, you must submit the results of the perform ance tests following the procedure specified in either paragra ph (f)(1) or (2) of this section. (1) For data collected using test methods supported by the EPA’s Electronic Reporting Tool (ERT) as listed on the EPA’s ERT Web site ( http://www.epa.gov/ttn/chief/ert/index.html ) at the time of the test, you must submit the results of th e performance test to the EPA via the Compliance and Emissions Da ta Reporting Interface (CEDRI). (CEDRI can be accessed through t he EPA’s Central Data Exchange (CDX) (http://cdx.epa.gov/)). Performance test data must be submitted in a file format genera ted through the use of the EPA’s ERT or an alternate electronic file format consistent with the extensible markup language (XML ) schema listed on the EPA’s ERT Web site. If you claim that some of the performance test information being submitted is con fidentialPage 163 of 182

business information (CBI), you must submit a compl ete file generated through the use of the EPA’s ERT or an al ternate electronic file consistent with the XML schema list ed on the EPA’s ERT Web site, including information claimed t o be CBI, on a compact disc, flash drive, or other commonly used electronic storage media to the EPA. The electronic media must be clearly marked as CBI and mailed to U.S. EPA/OAPQS/CORE CBI Office, Attention: Group Leader, Measurement Policy Group, MD C404-02, 4930 Old Page Rd., Durham, NC 27703. The same ERT o r alternate file with the CBI omitted must be submitted to the EPA via the EPA’s CDX as described earlier in this paragraph. (2) For data collected using test methods that are not supported by the EPA’s ERT as listed on the EPA’s E RT Web site at the time of the test, you must submit the result s of the performance test to the Administrator at the approp riate address listed in § 63.13. §§63.754-63.758 [Reserved] §63.759 Implementation and enforcement. (a) This subpart can be implemented and enforced by the U.S. EPA, or a delegated authority such as the appl icable State, local, or Tribal agency. If the U.S. EPA Administra tor has delegated authority to a State, local, or Tribal ag ency, then that agency, in addition to the U.S. EPA, has the a uthority to implement and enforce this subpart. Contact the app licable U.S.Page 164 of 182

EPA Regional Office to find out if implementation a nd enforcement of this subpart is delegated to a State , local, or Tribal agency. (b) In delegating implementation and enforcement au thority of this subpart to a State, local, or Tribal agency under subpart E of this part, the authorities contained i n paragraph (c) of this section are retained by the Administrat or of U.S. EPA and cannot be transferred to the State, local, or Tribal

agency. (c) The authorities that cannot be delegated to Sta te, local, or Tribal agencies are as specified in parag raphs (c)(1) through (4) of this section. (1) Approval of alternatives to the requirements in §§63.741, 63.743, 63.744(a)(3), (b) through (e), 63 .745 through 63.748, and 63.649(a). (2) Approval of major alternatives to test methods under §63.7(e)(2)(ii) and (f), as defined in §63.90, and as required in this subpart. (3) Approval of major alternatives to monitoring un der §63.8(f), as defined in §63.90, and as required in this subpart. (4) Approval of major alternatives to recordkeeping and reporting under §63.10(f), as defined in §63.90, an d as required in this subpart.Page 165 of 182

Table 1 to Subpart GG of Part 63—General Provisions Applicability to Subpart GG

Reference Applies to affected sources in subpart GG Comment 63.1(a)(1) Yes 63.1(a)(2) Yes 63.1(a)(3) Yes 63.1(a)(4) Yes 63.1(a)(5) No Reserved. 63.1(a)(6) Yes 63.1(a)(7) Yes 63.1(a)(8) Yes 63.1(a)(9) No Reserved. 63.1(a)(10) Yes 63.1(a)(11) Yes 63.1(a)(12) Yes 63.1(a)(13) Yes 63.1(a)(14) Yes 63.1(b)(1) Yes 63.1(b)(2) Yes 63.1(b)(3) Yes 63.1(c)(1) Yes 63.1(c)(2) Yes Subpart GG does not apply to area sources. 63.1(c)(3) No Reserved. 63.1(c)(4) Yes 63.1(c)(5) Yes 63.1(d) No Reserved. 63.1(e) Yes 63.2 Yes 63.3 Yes 63.4(a)(1) Yes 63.4(a)(2) YesPage 166 of 182

Reference Applies to affected sources in subpart GG Comment 63.4(a)(3) Yes 63.4(a)(4) No Reserved. 63.4(a)(5) Yes 63.4(b) Yes 63.4(c) Yes 63.5(a) Yes 63.5(b)(1) Yes 63.5(b)(2) No Reserved. 63.5(b)(3) Yes 63.5(b)(4) Yes 63.5(b)(5) Yes 63.5(b)(6) Yes 63.5(c) No Reserved. 63.5(d)(1)(i) Yes 63.5(d)(1)(ii)(A)- (H) Yes

63.5(d)(1)(ii)(I) No Reserved. 63.5(d)(1)(ii)(J) Yes 63.5(d)(1)(iii) Yes 63.5(d)(2)-(4) Yes 63.5(e) Yes 63.5(f) Yes 63.6(a) Yes 63.6(b)(1)-(5) Yes §63.749(a) specifies compliance dates for new sources. 63.6(b)(6) No Reserved. 63.6(b)(7) Yes 63.6(c)(1) Yes 63.6(c)(2) No The standards in subpart GG are promulgated under section 112(d) of the Act.Page 167 of 182

Reference Applies to affected sources in subpart GG Comment 63.6(c)(3)-(4) No Reserved. 63.6(c)(5) Yes 63.6(d) No Reserved. 63.6(e )(1)(i ) No See § 63.743( e) for general duty requirement. 63.6(e)(1)(ii) No 63.6(e)(2) No Section reserved. 63.6(e)(3) No 63.6(f)(1) No 63.6(f )(2)-(f)(3 ) Yes 63.6(g) Yes 63.6(h) No The standards in subpart GG do not include opacity standards. 63.6(i)(1)-(3) Yes 63.6(i)(4)(i)(A) Yes 63.6(i)(4)(i)(B) No § 63.743(a )(4) specifies that requests for extension of compliance must be submitted no later than 120 days before an affected source's compliance date. 63.6(i)(4)(ii) No The standards in subpart GG are promulgated under section 112(d) of the Act. 63.6(i)(5)-(12) Yes 63.6(i)(13) Yes 63.6(i)(14) Yes 63.6(i)(15) No Reserved. 63.6(i)(16) Yes 63.6(j) Yes 63.7(a)(1) Yes 63.7(a)(2)(i)-(vi) Yes Deleted: Yes Deleted: b) includes additional provisions Deleted: the operation and maintenance plan.Page 168 of 182

Reference Applies to affected sources in subpart GG Comment 63.7(a)(2)(vii)- (viii) No Reserved.

63.7(a)(2)(ix) Yes 63.7(a)(3) Yes 63.7(b) Yes 63.7(c) Yes 63.7(d) Yes 63.7(e )(1 ) No See § 63.749(j). 63.7(e)(2)-(4) Yes 63.7(f) Yes 63.7(g)(1) Yes 63.7(g)(2) No Reserved. 63.7(g)(3) Yes 63.7(h) Yes 63.8(a)(1)-(2) Yes 63.8(a)(3) No Reserved. 63.8(a)(4) Yes 63.8(b) Yes 63.8(c)(1)(i) No 63.8(c )(1)(ii ) Yes 63.8(c)(1)(iii) No 63.8(c)(2)-(d)(2) Yes 63.8(d )(3 ) No 63.8(e)(1)-(4) Yes 63.8(e)(5)(i) Yes 63.8(e)(5)(ii) No The standards in subpart GG do not include opacity standards. 63.8(f)(1) Yes 63.8(f)(2)(i)-(vii) Yes Deleted: YesPage 169 of 182

Reference Applies to affected sources in subpart GG Comment 63.8(f)(2)(viii) No The standards in subpart GG do not include opacity standards. 63.8(f)(2)(ix) Yes 63.8(f)(3)-(6) Yes 63.8(g) Yes 63.9(a) Yes 63.9(b)(1) Yes 63.9(b)(2) Yes § 63.753(a)(1) requires submittal of the initial notification at least 1 year prior to the compliance date; §63.753(a)(2) allows a title V or part 70 permit application to be substituted for the initial notification in certain circumstances. 63.9(b)(3) Yes 63.9(b)(4) Yes 63.9(b)(5) Yes 63.9(c) Yes 63.9(d) Yes 63.9(e) Yes 63.9(f) No The standards in subpart GG do not include opacity standards. 63.9(g)(1) No 63.9(g)(2) No The standards in subpart GG do not include opacity standards. 63.9(g)(3) No 63.9(h)(1)-(3) Yes § 63.753(a)(1) also specifies additional information to be included in the notification of compliance status. 63.9(h)(4) No Reserved. 63.9(h)(5)-(6) YesPage 170 of 182

Reference Applies to affected sources in subpart GG Comment 63.9(i) Yes 63.9(j) Yes 63.10(a) Yes 63.10(b)(1) Yes 63.10(b)(2)(i) No 63.10( b)(2)(ii ) No See § 63.752(a) for recordkeeping of (1) date, time, and duration; (2) listing of affected source or equipment, and an estimate of the quantity of each regulated pollutant emitted over the standard; and (3) actions to minimize emissions and correct the failure. 63.10(b)(2)(iii) Yes 63.10(b)(2)(iv)-(v) No 63.10(b)(2)(vi) Yes 63.10(b )(2)(vi)(A)- (C ) No § 63.10(b)(vii)(A), (B) and (C) do not apply because subpart GG does not require the use of CEMS. 63.10(b)(2)(vii)- (xiv) 63.10(b)(3) Yes 63.10(c)(1) No 63.10(c)(2)-(4) No Reserved. 63.10(c)(5)-( 6 ) No 63.10(c)(7)-(8) Yes 63.10(c)(9) No Reserved. 63.10(c)(10)-(13) No 63.10(c)(14) No § 63.8(d) does not apply to this subpart. 63.10(c)(15) No 63.10(d)(1)-(2) Yes Deleted: a Deleted: Yes

Deleted: Yes

Deleted: 8Page 171 of 182

Reference Applies to affected sources in subpart GG Comment 63.10(d)(3) No The standards in subpart GG do not include opacity standards. 63.10(d)(4) Yes 63.10(d)(5) No. See § 63.753 (a)(5) for malfunction reporting requirements. 63.(10)(e)(1) No 63.10(e)(2)(i) No 63.10(e)(2)(ii) No The standards in subpart GG do not include opacity standards. 63.10(e)(3) No 63.10(e)(4) No The standards in subpart GG do not include opacity standards. 63.10(f) Yes 63.11 Yes 63.12 Yes 63.13 Yes 63.14 Yes 63.15 Yes 63.16 Yes Appendix A to Subpart GG of Part 63—Specialty Coati ng Definitions Ablative coating—A coating that chars when exposed to open flame or extreme temperatures, as would occur durin g the failure of an engine casing or during aerodynamic heating. The ablative char surface serves as an insulative barrier, prote cting adjacent components from the heat or open flame. Deleted: YesPage 172 of 182

Adhesion promoter—A very thin coating applied to a substrate to promote wetting and form a chemical bo nd with the subsequently applied material. Adhesive bonding primer—A primer applied in a thin film to aerospace components for the purpose of corrosion i nhibition and increased adhesive bond strength by attachment. The re are two categories of adhesive bonding primers: primers wit h a design cure at 250 °F or below and primers with a design c ure above 250 °F. Aerosol coating—A hand-held, pressurized, nonrefill able container that expels an adhesive or a coating in a finely divided spray when a valve on the container is depr essed. Antichafe coating—A coating applied to areas of mov ing aerospace components that may rub during normal ope rations or

installation. Bearing coating—A coating applied to an antifrictio n bearing, a bearing housing, or the area adjacent to such a bearing in order to facilitate bearing function or to protect base material from excessive wear. A material shall not be classified as a bearing coating if it can also be c lassified as a dry lubricative material or a solid film lubrican t. Bonding maskant—A temporary coating used to protect selected areas of aerospace parts from strong acid or alkaline solutions during processing for bonding.Page 173 of 182

Caulking and smoothing compounds—Semi-solid materia ls which are applied by hand application methods and are use d to aerodynamically smooth exterior vehicle surfaces or fill cavities such as bolt hole accesses. A material sha ll not be classified as a caulking and smoothing compound if it can also

be classified as a sealant. Chemical agent-resistant coating (CARC)—An exterior topcoat designed to withstand exposure to chemical warfare agents or the decontaminants used on these agents. Clear coating—A transparent coating usually applied over a colored opaque coating, metallic substrate, or plac ard to give improved gloss and protection to the color coat. In some cases, a clearcoat refers to any transparent coating witho ut regard to

substrate. Commercial exterior aerodynamic structure primer—A primer used on aerodynamic components and structures that protrude from the fuselage, such as wings and attached components , control surfaces, horizontal stabilizers, vertical fins, wi ng-to-body fairings, antennae, and landing gear and doors, for the purpose of extended corrosion protection and enhanced adhes ion. Commercial interior adhesive—Materials used in the bonding of passenger cabin interior components. These compo nents must meet the FAA fireworthiness requirements.Page 174 of 182

Compatible substrate primer—Includes two categories : compatible epoxy primer and adhesive primer. Compat ible epoxy primer is primer that is compatible with the filled elastomeric coating and is epoxy based. The compatible substrat e primer is an epoxy-polyamide primer used to promote adhesion of elastomeric coatings such as impact-resistant coati ngs. Adhesive primer is a coating that (1) inhibits corrosion and serves as a primer applied to bare metal surfaces or prior to a dhesive application, or (2) is applied to surfaces that can be expected to contain fuel. Fuel tank coatings are excluded fr om this category. Corrosion prevention system—A coating system that p rovides corrosion protection by displacing water and penetr ating mating surfaces, forming a protective barrier between the metal surface and moisture. Coatings containing oils or waxes are excluded from this category. Critical use and line sealer maskant—A temporary co ating, not covered under other maskant categories, used to protect selected areas of aerospace parts from strong acid or alkaline solutions such as those used in anodizing, plating, chemical milling and processing of magnesium, titanium, high -strength steel, high-precision aluminum chemical milling of deep cuts, and aluminum chemical milling of complex shapes. Ma terials usedPage 175 of 182

for repairs or to bridge gaps left by scribing oper ations (i.e. line sealer) are also included in this category. Cryogenic flexible primer—A primer designed to prov ide corrosion resistance, flexibility, and adhesion of subsequent coating systems when exposed to loads up to and sur passing the yield point of the substrate at cryogenic temperatu res ( −275 °F and below). Cryoprotective coating—A coating that insulates cry ogenic or subcooled surfaces to limit propellant boil-off, maintain structural integrity of metallic structures during ascent or reentry, and prevent ice formation. Cyanoacrylate adhesive—A fast-setting, single compo nent adhesive that cures at room temperature. Also known as “super glue.” Dry lubricative material—A coating consisting of la uric acid, cetyl alcohol, waxes, or other non-cross link ed or resinbound materials which act as a dry lubricant. Electric or radiation-effect coating—A coating or c oating system engineered to interact, through absorption o r reflection, with specific regions of the electromagnetic energy spectrum, such as the ultraviolet, visible, infrared, or micr owave regions. Uses include, but are not limited to, ligh tning strike protection, electromagnetic pulse (EMP) protection, and radar avoidance. Coatings that have been designated as “ Classified Deleted: classifiedPage 176 of 182

National Security Information ” by the Department of Defense are exempt. Electrostatic discharge and electromagnetic interfe rence (EMI) coating—A coating applied to aerospace vehicles and components to disperse static energy or reduce electromagneti c interference. Elevated-temperature Skydrol-resistant commercial p rimer—A primer applied primarily to commercial aircraft (or commercial aircraft adapted for military use) that must withst and immersion in phosphate-ester (PE) hydraulic fluid (Skydrol 50 0b or equivalent) at the elevated temperature of 150 °F f or 1,000

hours. Epoxy polyamide topcoat—A coating used where harder films are required or in some areas where engraving is ac complished in camouflage colors. Fire-resistant (interior) coating—For civilian airc raft, fire-resistant interior coatings are used on passen ger cabin interior parts that are subject to the FAA firewort hiness requirements. For military aircraft, fire-resistant interior coatings are used on parts subject to the flammabil ity requirements of MIL-STD-1630A and MIL-A-87721. For space applications, these coatings are used on parts subj ect to the flammability requirements of SE-R-0006 and SSP 3023 3. Deleted: space Deleted: , missiles, aircraft radomes, Deleted: helicopter bladesPage 177 of 182

Flexible primer—A primer that meets flexibility requirements such as those needed for adhesive bond primed fastener heads or on surfaces expected to contain f uel. The flexible coating is required because it provides a compatible,

flexible substrate over bonded sheet rubber and rub ber-type coatings as well as a flexible bridge between the f asteners, skin, and skin-to-skin joints on outer aircraft ski ns. This flexible bridge allows more topcoat flexibility aro und fasteners and decreases the chance of the topcoat cracking ar ound the fasteners. The result is better corrosion resistanc e. Flight test coating—A coating applied to aircraft o ther than missiles or single-use aircraft prior to fligh t testing to protect the aircraft from corrosion and to provide required marking during flight test evaluation. Fuel tank adhesive—An adhesive used to bond compone nts exposed to fuel and that must be compatible with fu el tank coatings. Fuel tank coating—A coating applied to fuel tank co mponents to inhibit corrosion and/or bacterial growth and to assure sealant adhesion in extreme environmental condition s. High temperature coating—A coating designed to with stand temperatures of more than 350 °F.Page 178 of 182

Insulation covering—Material that is applied to foa m insulation to protect the insulation from mechanica l or environmental damage. Intermediate release coating—A thin coating applied beneath topcoats to assist in removing the topcoat in depai nting operations and generally to allow the use of less h azardous depainting methods. Lacquer—A clear or pigmented coating formulated wit h a nitrocellulose or synthetic resin to dry by evapora tion without a chemical reaction. Lacquers are resoluble in thei r original

solvent. Metalized epoxy coating—A coating that contains rel atively large quantities of metallic pigmentation for appea rance and/or added protection. Mold release—A coating applied to a mold surface to prevent the molded piece from sticking to the mold as it is removed. Nonstructural adhesive—An adhesive that bonds nonlo ad bearing aerospace components in noncritical applica tions and is not covered in any other specialty adhesive categor ies. Optical anti-reflection coating—A coating with a lo w reflectance in the infrared and visible wavelength ranges, which is used for anti-reflection on or near optical and laser

hardware.Page 179 of 182

Part marking coating—Coatings or inks used to make identifying markings on materials, components, and/ or assemblies. These markings may be either permanent or temporary. Pretreatment coating—An organic coating that contai ns at least 0.5 percent acids by weight and is applied di rectly to metal or composite surfaces to provide surface etch ing, corrosion resistance, adhesion, and ease of strippi ng. Rain erosion-resistant coating—A coating or coating system used to protect the leading edges of parts such as flaps, stabilizers, radomes, engine inlet nacelles, etc. a gainst erosion caused by rain impact during flight. Rocket motor bonding adhesive—An adhesive used in r ocket motor bonding applications. Rocket motor nozzle coating—A catalyzed epoxy coati ng system used in elevated temperature applications on rocket motor

nozzles. Rubber-based adhesive—Quick setting contact cements that provide a strong, yet flexible, bond between two ma ting surfaces that may be of dissimilar materials. Scale inhibitor—A coating that is applied to the su rface of a part prior to thermal processing to inhibit the f ormation of

scale. Screen print ink—Inks used in screen printing proce sses during fabrication of decorative laminates and deca ls.Page 180 of 182

Seal coat maskant—An overcoat applied over a maskan t to improve abrasion and chemical resistance during pro duction operations. Sealant—A material used to prevent the intrusion of water, fuel, air, or other liquids or solids from certain areas of aerospace vehicles or components. There are two cat egories of sealants: extrudable/rollable/brushable sealants an d sprayable

sealants. Silicone insulation material—Insulating material ap plied to exterior metal surfaces for protection from high te mperatures caused by atmospheric friction or engine exhaust. T hese materials differ from ablative coatings in that the y are not “sacrificial.” Solid film lubricant—A very thin coating consisting of a binder system containing as its chief pigment mater ial one or more of the following: molybdenum, graphite, polytetrafluoroethylene (PTFE), or other solids tha t act as a dry lubricant between faying surfaces. Specialized function coatings—Coatings that fulfill extremely specific engineering requirements that ar e limited in application and are characterized by low volume usa ge. This category excludes coatings covered in other Special ty Coating categories.Page 181 of 182

Structural autoclavable adhesive—An adhesive used t o bond load-carrying aerospace components that is cured by heat and pressure in an autoclave. Structural nonautoclavable adhesive—An adhesive cur ed under ambient conditions that is used to bond load-carryi ng aerospace components or for other critical functions, such as nonstructural bonding in the proximity of engines. Temporary protective coating—A coating applied to p rovide scratch or corrosion protection during manufacturin g, storage, or transportation. Two types include peelable prote ctive coatings and alkaline removable coatings. These mat erials are not intended to protect against strong acid or alka line solutions. Coatings that provide this type of prote ction from chemical processing are not included in this catego ry. Thermal control coating—Coatings formulated with sp ecific thermal conductive or radiative properties to permi t temperature

control of the substrate. Touch-up and Repair Coating—A coating used to cover minor coating imperfections appearing after the main coat ing operation. Wet fastener installation coating—A primer or seala nt applied by dipping, brushing, or daubing to fastene rs that are installed before the coating is cured.Page 182 of 182

Wing coating—A corrosion-resistant topcoat that is resilient enough to withstand the flexing of the wi ngs.