[Federal Register Volume 60, Number 170 (Friday, September 1, 1995)]
[Rules and Regulations]
[Pages 45948-45980]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-21505]




[[Page 45947]]

_______________________________________________________________________

Part III





Environmental Protection Agency





_______________________________________________________________________



40 CFR Parts 9 and 63



National Emission Standards for Hazardous Air Pollutants for Source 
Categories; Final Rule

  Federal Register / Vol. 60, No. 170 / Friday, September 1, 1995 / 
Rules and Regulations  


[[Page 45948]]


ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 9 and 63

[AD-FRL-5273-9]
RIN 2060-AE02


National Emission Standards for Hazardous Air Pollutants for 
Source Categories: Aerospace Manufacturing and Rework Facilities

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: National emission standards for hazardous air pollutants 
(NESHAP) for aerospace manufacturing and rework facilities were 
proposed in the Federal Register on June 6, 1994. This Federal Register 
action announces the EPA's final decisions on the rule and promulgates 
the NESHAP for aerospace manufacturing and rework facilities. Aerospace 
manufacturing and rework operations emit many of the pollutants 
identified in the Clean Air Act (Act) list of 189 hazardous air 
pollutants (HAP). The intent of the standards is to protect public 
health by requiring existing and new major sources to control emissions 
to the level achievable by the maximum achievable control technology 
(MACT) consistent with section 112(d) of the Act.
    The HAP listed in Section 112(b)(1) emitted by aerospace facilities 
that would be covered by this final rule include, chromium, cadmium, 
methylene chloride, toluene, xylene, methyl ethyl ketone, ethylene 
glycol and glycol ethers. This rule will reduce nationwide emissions of 
HAP from at least 2,869 major source aerospace manufacturing and rework 
facilities by approximately 112,600 Mg (123,700 tons).

DATES: This regulation is effective on September 1, 1995. The 
incorporation by reference of certain publications listed in the 
regulation is approved by the Office of the Federal Register as of 
September 1, 1995. See the SUPPLEMENTARY INFORMATION section concerning 
judicial review.

ADDRESSES: Background Information Document.  The background information 
document (BID) for the promulgated standards may be obtained from the 
U.S. Department of Commerce, National Technical Information Service 
(NTIS), Springfield, Virginia 22161, telephone (703) 487-4650. Please 
refer to ``Hazardous Air Pollutant Emissions from Aerospace 
Manufacturing and Rework Operations--Background Information for 
Promulgated Standards'' (EPA-453/R-94-036b). The BID contains: (1) a 
summary of all the public comments made on the proposed standards and 
the Administrator's responses to the comments, and (2) a summary of the 
changes made to the standards since proposal.
    An electronic version of the promulgation BID as well as this 
preamble and final rule are available for download from the EPA's 
Technology Transfer Network (TTN), a network of electronic bulletin 
boards developed and operated by the Office of Air Quality Planning and 
Standards. The TTN provides information and technology exchange in 
various areas of air pollution control. The service is free, except for 
the cost of a phone call. Dial (919) 541-5742 for data transfer of up 
to a 14,400 bits per second (bps) modem. If more information on the TTN 
is needed, contact the systems operator at (919) 541-5384.
    Docket. Docket No. A-92-20, containing supporting information used 
in developing the promulgated standards, is available for public 
inspection and copying from 8 a.m. to 4 p.m., Monday through Friday, 
including all non-Government holidays, at the EPA's Air and Radiation 
Docket and Information Center (formerly known as the Air Docket), 
Waterside Mall, room M-1500, Ground Floor, 401 M Street, S.W., 
Washington, DC 20460; telephone (202) 260-7548. A reasonable fee may be 
charged for copying.

FOR FURTHER INFORMATION CONTACT: For general or technical information 
concerning the standards, contact Ms. Vickie Boothe, Emission Standards 
Division (MD-13), U.S. Environmental Protection Agency, Research 
Triangle Park, North Carolina 27711; telephone (919) 541-0164.

SUPPLEMENTARY INFORMATION: Under section 307(b)(1) of the Act, judicial 
review of NESHAP is available only by filing a petition for review in 
the U.S. Court of Appeals for the District of Columbia Circuit within 
60 days of today's publication of this final rule. Under section 
307(b)(2) of the Act, the requirements that are the subject of today's 
notice may not be challenged later in civil or criminal proceedings 
brought by the EPA to enforce these requirements. The information 
presented in this preamble is organized as follows:

I. The Standards
II. Summary of Considerations in Developing the Rule
A. Purpose of Regulation
B. Summary of Impacts
III. Significant Changes to the Proposed Standards
A. Public Participation
B. Comments on the Proposed Standards
C. Significant Changes
IV. Administrative Requirements
A. Docket
B. Paperwork Reduction Act
C. Executive Order 12866
D. Regulatory Flexibility Act
E. Regulatory Review
F. Unfunded Mandate Act

I. The Standards

    National emission standards for hazardous air pollutants 
established under section 112 of the Act must

reflect the maximum degree of reduction in emissions of the 
hazardous air pollutants subject to this section (including a 
prohibition on such emissions, where achievable) that the 
Administrator, taking into consideration the cost of achieving such 
emission reduction, and any nonair quality health and environmental 
impacts and energy requirements, determines is achievable for new or 
existing sources in the category or subcategory to which such 
emission standard applies . . . [section 112(d)(2)].

    The promulgated standards include multiple alternatives to allow 
owners or operators maximum compliance flexibility. A summary of the 
final standards is contained in Table 1.

  Table 1. Summary of Subpart GG of 40 CFR Part 63--National Emission Standards for Aerospace Manufacturing and 
                                                Rework Facilities                                               
----------------------------------------------------------------------------------------------------------------
  Affected Source and Requirement                                    Description                                
----------------------------------------------------------------------------------------------------------------
Aerospace Facilities                                                                                            
    Applicability:                                                                                              
        General Information........  This rule applies to facilities engaged in original equipment manufacture  
                                      and/or rework of aerospace components and assemblies and that are major   
                                      sources as defined in 40 CFR part 63. Specific operations are covered by  
                                      the rule. (63.741)                                                        
        Estimated Number of          Over 2,800 facilities are expected to be affected by the rule. Applicable  
         Facilities.                  SIC codes include 3720, 3721, 3724, 3728, 3760, 3761, 3764, 3765, and     
                                      4581.                                                                     

[[Page 45949]]
                                                                                                                
        Permit Requirements........  Major sources required to obtain operating permit in State where facility  
                                      is located according to procedures in 40 CFR part 70 and applicable State 
                                      regulations. (63.741(d))                                                  
All Affected Sources                                                                                            
        Standards..................  1. Comply with Sec.  63.4 through Sec.  63.6 of the General Provisions of  
                                      40 CFR part 63, subpart A.a (63.743(a))                                   
                                     2. Submit an operation and maintenance plan, except for new sources or     
                                      filter systems operated per manufacturer's instructions. (63.743(b))      
                                     3. Obtain approval to use control device not listed in this subpart.       
                                      (63.743(c))                                                               
        Compliance Dates...........  As provided for in the General Provisions, within 3 years after the        
                                      effective date for existing sources and no later than the standards'      
                                      effective date or upon startup, as appropriate, for new and reconstructed 
                                      sources. (63.749(a))                                                      
        Test Methods and Procedures  See individual affected sources. Also, comply with Sec.  63.7 of the       
                                      General Provisions. (63.750(o))                                           
        Monitoring Requirements....  See individual affected sources. Also, generally same as in Sec.  63.8(f)  
                                      and (g) of the General Provisions. (63.751(e) and (f))                    
        Recordkeeping Requirements.  Comply with parts of Sec.  63.10 of the General Provisions. (63.752(a))    
        Reporting Requirements.....  1. See individual affected sources. Comply with parts of Sec.  63.9 and    
                                      Sec.  63.10 of the General Provisions. Semiannual reports or annual if    
                                      compliant. (63.753(a)(1) and (3))                                         
                                     2. Operating permit application can be used for initial notification.      
                                      (63.753(a)(2))                                                            
Cleaning Operations:                                                                                            
        Standards..................  Housekeeping measures for all cleaning operations at a facility subject to 
                                      this subpart. Measures address placing solvent laden cloth or paper in    
                                      closed containers, storing fresh and used cleaning solvent in closed      
                                      containers, and minimizing spills during handling and transfer.           
                                      (63.744(a))                                                               
        Test Methods and Procedures  See individual affected sources.                                           
        Monitoring Requirements....  See individual affected sources.                                           
        Recordkeeping Requirements.  The name and vapor pressure of each cleaning solvent, and supporting       
                                      documentation. (63.752(b)(1))                                             
Hand-Wipe Cleaning Operations:                                                                                  
        Standards..................  1. Except for spray gun and flush cleaning, all HAP or VOC hand-wipe       
                                      cleaning solvents must meet a composition requirement, have a vapor       
                                      pressure less than 45 mm Hg at 20 deg.C, or meet the requirements         
                                      specified in an alternative compliance plan administered by the permitting
                                      authority and approved under Section 112(l) of the Clean Air Act.         
                                      (63.744(b))                                                               
                                     2. List of cleaning operations exempt from composition and vapor pressure  
                                      requirements. (63.744(e))                                                 
        Test Methods and Procedures  1. Composition determination through manufacturer's data. (63.750(a))      
                                     2. Vapor pressure determination through readily available sources if single
                                      component; ASTM E 260-91 and composite vapor pressure determination       
                                      procedure for multiple component solvents. (63.750(b))                    
        Monitoring Requirements....  None.                                                                      
        Recordkeeping Requirements.  1. If complying with composition requirements, name, data/calculations, and
                                      annual volumes. (63.752(b)(2))                                            
                                     2. If complying with vapor pressure limit, the name, vapor pressure, data/ 
                                      calculations/test results, and monthly volumes. (63.752(b)(3))            
                                     3. For noncompliant cleaning solvents used in exempt operations, monthly   
                                      volumes by operation, and master list of processes. (63.752(b)(4))        
        Reporting Requirements.....                                   Semiannual                                
                                     1. Noncompliant solvent usage. (63.753(b)(1)(ii))                          
                                     2. New solvents and vapor pressure or composition. (63.753(b)(1)(iii))     
Hand-Wipe Cleaning Operations                                                                                   
 (cont.)Reporting Requirements                                                                                  
 (cont.)                                                                                                        
3. Statement certifying everything                                                                              
 is in compliance. (63.753(b)(2))                                                                               
Spray Gun Cleaning:                                                                                             
        Standards..................  1. Use one of four specified techniques or an equivalent. (63.744(c))      
                                     2. For enclosed spray gun cleaners, repair as soon as practicable, but     
                                      within 15 days. (63.744(c)(1)(ii))                                        
        Test Methods and Procedures  None.                                                                      
        Monitoring Requirements....  Visual inspection for leaks at least once per month. (63.751(a))           
        Recordkeeping Requirements.  Record all leaks, including source identification and dates leaks found and
                                      repaired. (63.752(b)(5))                                                  
        Reporting Requirements.....                                   Semiannual                                
                                     1. Noncompliant spray gun cleaning method used. (63.753(b)(1)(iii))        
                                     2. Leaks of enclosed spray gun cleaners not repaired within 15 days of     
                                      detection. (63.753(b)(1)(iv))                                             
                                     3. Statement certifying everything is in compliance. (63.753(b)(1)(v))     
Flush Cleaning:                                                                                                 
        Standards..................  Operating procedures specify emptying into enclosed container, collection  
                                      system, or equivalent. (63.744(d)) Flush Cleaning (cont.)                 
        Test Methods and Procedures  None.                                                                      

[[Page 45950]]
                                                                                                                
        Monitoring Requirements....  None.                                                                      
        Recordkeeping Requirements.  None.                                                                      
        Reporting Requirements.....                                   Semiannual                                
                                     Statement certifying everything is in compliance. (63.753(b)(2))           
Primer and Topcoat Application                                                                                  
 Operations:                                                                                                    
        Standards..................  Minimize spills during handling and transfer. (63.745(b))                  
                                                                 Uncontrolled Primers                           
                                     1. Organic HAP content limit: 350 g/l (2.9 lb/gal) (less water) as applied.
                                      (63.745(c)(1))                                                            
                                     2. VOC content limit: 350 g/l (2.9 lb/gal) (less water and exempt solvents)
                                      as applied. (63.745(c)(2))                                                
                                     3. Achieve compliance through: (1) use coatings below content limits, or   
                                      (2) use monthly volume-weighted averaging to meet content limits.         
                                      (63.745(e))                                                               
                                                                Uncontrolled Topcoats                           
                                     4. Organic HAP content limit: 420 g/l (3.5 lb/gal) (less water) as applied.
                                      (63.745(c)(3))                                                            
                                     5. VOC content limit: 420 g/l (3.5 lb/gal) (less water and exempt          
                                      solvents). (63.745(c)(4))6.                                               
                                     6. Achieve compliance as in 3. above. (63.745(e))                          
                                                           Controlled Primers and Topcoats                      
                                     7. If control system is used, must be designed to capture and control all  
                                      emissions from the application operation and must achieve an overall      
                                      control efficiency of at least 81%. (63.745(d))                           
                                                               All Primers and Topcoats                         
                                     8. Specific application techniques must be used. If alternative is sought, 
                                      can only be used if emissions are less than or equal to HVLP or           
                                      electrostatic spray application techniques. (63.745(f)(1))                
                                     9. All application equipment must be operated according to manufacturer's  
                                      specifications, company procedures, or locally specified operating        
                                      procedures. (63.745(f)(2))                                                
                                     10. Exemptions from No. 8 above provided for in certain situations.        
                                      (63.745(f)(3))                                                            
                                     11. Operating requirements for the application of primers or topcoats that 
                                      contain inorganic HAP, including control with either particulate filters  
                                      or waterwash, and shutdown if operated outside manufacturer's specified   
                                      limits. (63.745(g)(1) through (3))                                        
                                     12. Exemptions from No. 11 provided for certain application operations.    
                                      (63.745(g)(4))                                                            
        Performance Test Periods     1. For ``compliant'' coatings: each 30-day period. For ``averaged''        
         and Tests.                   coatings: each 30-day period. For ``controlled'' coatings, non-carbon     
                                      adsorber: three 1-hour runs. For ``controlled'' coatings, carbon adsorber:
                                      each rolling period. (63.749(e)(1))                                       
                                     2. Initial performance test for all control devices to demonstrate         
                                      compliance with overall control efficiency requirement. (63.749(e)(2))    
        Test Methods and Procedures  1. Organic HAP level determination procedures. (63.750(c) and (d))         
                                     2. VOC level determination procedures. (63.750(e) and (f))                 
                                     3. Overall control efficiency of carbon adsorber system determined using   
                                      provided procedures; for other control devices, determine capture         
                                      efficiency and destruction efficiency. For capture efficiency, use        
                                      Procedure T in Appendix B to 40 CFR 52.741 for total enclosures and 40 CFR
                                      52.741(a)(4)(iii) procedures for all other enclosures. (63.750(g) and (h))
                                     ...........................................................................
                                     4. For alternative application methods, first determine emission levels for
                                      initial 30-day period or five aircraft using only HVLP or electrostatic,  
                                      or a time period specified by the permitting agency. Then use alternative 
                                      application method for period of time necessary to coat equivalent amount 
                                      of parts with same coatings. Alternative application method may be used   
                                      when emissions generated during the test period are less than or equal to 
                                      the emissions generated during the initial 30-day period or five aircraft.
                                      Dried film thickness must be within specification for initial 30-day      
                                      period or five aircraft as demonstrated under actual production           
                                      conditions. (63.750(i))                                                   
        Monitoring Requirements....  1. Temperature sensors with continuous recorders for incinerators, and     
                                      install, calibrate, maintain, and operate temperature monitors according  
                                      to manufacturer's specifications. Use CEMS as an alternative. (63.751(b)) 
                                     2. Continuously monitor pressure drop across filter or water flow rate     
                                      through waterwash. (63.751(c))                                            
        Recordkeeping Requirements.  1. Name and VOC content for all primers and topcoats. If coating contains  
                                      exempt solvents, calculate total HAP content. (63.752(c)(1))              
                                     2. For ``compliant'' coatings, organic HAP and VOC contents as applied,    
                                      data/calculations or Method 24 used to determine them, and monthly usage. 
                                      (63.752(c)(2))                                                            
                                     3. For ``low-HAP/VOC'' primers, annual purchase records, and data/         
                                      calculations or Method 24 used to determine Hi. (63.752(c)(3))            
                                     4. For ``averaged'' coatings, monthly values of VOC content (Ha and Ga),   
                                      and data/calculations or Method 24 used to calculate Ha and Ga.           
                                      (63.752(c)(4))                                                            
                                     5. For ``controlled'' coatings (incinerator), overall control efficiency   
                                      and incinerator temperature(s). (63.752(c)(5))                            
                                     6. For ``controlled'' coatings (carbon adsorber), overall control          
                                      efficiency and length of rolling period and all supporting data/          
                                      calculations. (63.752(c)(6))                                              
                                     7. Pressure drop across filter or water flow rate through waterwash once   
                                      per shift, and acceptable limits. (63.752(d) (1) through (3))             
                                     8. For new sources with chromated coatings, documentation that filters meet
                                      multistage or HEPA requirements. (63.752(d)(4))                           
        Reporting Requirements.....                                  Semiannual                                 

[[Page 45951]]
                                                                                                                
                                     1. All instances where organic HAP/VOC limits were exceeded.               
                                      (63.753(c)(1)(i), (ii), and (viii))                                       
                                     2. Control device exceedances (out-of-compliance). (63.753(c)(1)(iii),     
                                      (iv), and (v))                                                            
                                     3. Periods when operation not immediately shut down due to pressure drop or
                                      water flow rate being outside limits. (63.753(c)(1)(vi))                  
                                     4. Statement certifying everything is in compliance. (63.753(c)(vii))      
                                                                        Annual                                  
                                     5. Number of times the pressure drop or water flow rate limits were        
                                      exceeded. (63.753(c)(2))                                                  
Depainting Operations:                                                                                          
        Applicability..............  Applies to the outer surface of aerospace vehicles. Does not apply to parts
                                      or units normally removed. Fuselage, wings, and stabilizers always        
                                      covered. Radomes, parts normally removed are exempt. (63.746(a))          
        Standards..................  1. Unless exempted, no organic HAP are to be emitted from chemical         
                                      strippers or softeners. (63.746(b)(1))                                    
                                     2. Minimize inorganic HAP emissions during periods of non-chemical based   
                                      equipment malfunction. (63.746(b)(2))                                     
                                     3. Use of organic HAP-containing strippers for spot stripping and decal    
                                      removal limited to 26 gallons per aircraft per year for commercial        
                                      aircraft and 50 gallons per aircraft per year for military aircraft.      
                                      (63.746(b)(3))                                                            
                                     4. Operating requirements for depainting operations generating airborne    
                                      inorganic HAP, including control with particulate filters or waterwash    
                                      systems. Mechanical and hand sanding are exempt. (63.746(b)(4) and (b)(5))
                                     5. Non-exempt organic HAP emissions controlled at 81% efficiency for       
                                      systems installed before effective date. For newer systems, control at    
                                      95%. (63.746(c))                                                          
        Performance Test Periods     1. For demonstrating no organic HAP emissions: each 24-hour period.        
         and Tests.                   (63.749(g)(1))                                                            
                                     2. For spot stripping and decal removal usage limits: each calendar year.  
                                      (63.749(g)(1))                                                            
                                     3. Initial performance test for all control devices to demonstrate         
                                      compliance with overall control efficiency requirement. (63.749 (g)(1),   
                                      (g)(2), and (g)(3))                                                       
        Test Methods and Procedures  1. Procedures provided for determining gallons of HAP-containing stripper  
                                      used for aircraft. (63.750(j))                                            
                                                                                                                
  .................................  ...........................................................................
                                     2. Overall control efficiency of carbon adsorber system determined using   
                                      specified procedures; for other control devices, determine capture        
                                      efficiency and destruction efficiency. For capture efficiency, use        
                                      Procedure T in Appendix B to 40 CFR 52.741 for total enclosures and 40 CFR
                                      52.741(a)(4)(iii) procedures for all other enclosures. (63.750 (g) and    
                                      (h))                                                                      
        Monitoring Requirements....  Continuously monitor pressure drop across filter or water flow rate through
                                      waterwash. (63.751(d))                                                    
        Recordkeeping Requirements.  1. Name and monthly volume of all organic HAP-containing chemical          
                                      strippers. (63.752(e)(1))                                                 
                                     2. For controlled chemical strippers (carbon adsorber), overall control    
                                      efficiency and length of rolling period and all supporting data/          
                                      calculations. (63.752(e)(2))                                              
                                     3. For controlled chemical strippers (other control devices), overall      
                                      control efficiency and supporting documentation. (63.752(e)(3))           
                                     4. List of parts/assemblies normally removed. (63.752(e)(4))               
        Recordkeeping Requirements.  5. For non-chemical based equipment, name and type, and malfunction        
                                      information including dates, description, and alternative methods used.   
                                      (63.752(e)(5))                                                            
                                     6. For spot stripping and decal removal, annual volume used, annual average
                                      volume per aircraft, and all data/calculations used to calculate volume   
                                      per aircraft. (63.752(e)(6))                                              
                                     7. Pressure drop across filter or water flow rate through waterwash once   
                                      per shift and acceptable limits. (63.752(e)(7))                           
                                                                                                                
        Reporting Requirements.....                                   Semiannual                                
                                     1. 24-hour periods where organic HAP were emitted from depainting          
                                      operations in violation of rule. (63.753(d)(1)(i))                        
                                     2. New and reformulated chemical strippers and HAP contents.               
                                      (63.753(d)(1)(ii), (iii), and (iv))                                       
                                     3. New non-chemical based depainting techniques. (63.753(d)(1)(v))         
                                     4. Malfunction information on non-chemical based techniques including      
                                      dates, description, and alternative methods used. (63.753(d)(1)(vi))      
                                     5. Periods when operation not immediately shut down due to pressure drop or
                                      water flow rate being outside limits. (63.753(d)(1)(vii))                 
                                     6. List of new/discontinued aircraft models and, for new models, list of   
                                      parts normally removed for depainting. (63.753(d)(1)(viii))               
                                     7. Organic HAP control device exceedances. (63.753(d)(3))                  
                                     8. Statement certifying everything is in compliance. (63.753(d)(2)(ii))    
                                                                        Annual                                  
                                     9. Exceedances of average annual volume limits for spot stripping and decal
                                      removal. (63.753(d)(2)(i))                                                
                                     10. Number of times the pressure drop or water flow rate limits were       
                                      exceeded. (63.753(d)(2)(iii))                                             
Chemical Milling Maskant Applica-                                                                               
 tion Operations:                                                                                               
        Applicability..............  Applies only to operations using Type II chemical milling etchants.        
                                      (63.747(a))                                                               
        Standards..................  Minimize spills during handling and transfer. (63.747(b))                  
                                                                Uncontrolled Maskants                           

[[Page 45952]]
                                                                                                                
                                     1. Organic HAP emissions:  160 g/l (1.3 lb/gal) (less water) as 
                                      applied. (63.747(c)(1))                                                   
                                     2. VOC emissions:  160 g/l (1.3 lb/gal) (less water and exempt  
                                      solvents) as applied. (63.747(c)(2))                                      
                                     3. Achieve compliance through: (1) use maskants below content limits, or   
                                      (2) use monthly volume-weighted averaging to meet content limits.         
                                      (63.747(e))                                                               
                                                                 Controlled Maskants                            
                                     4. If control device is used, system must be designed to capture and       
                                      control all emissions from maskant operation and must achieve an overall  
                                      control efficiency of at least 81% for systems installed before effective 
                                      date. For new systems, control at 95%. (63.747(d))                        
        Performance Test Periods     1. For compliant maskants: each 30-day period. For averaged maskants: each 
         and Tests.                   30-day period. For controlled coatings, carbon adsorber: each rolling     
                                      period.                                                                   
                                     For controlled coatings, non-carbon adsorber: three 1-hour runs.           
                                      (63.749(i)(1))                                                            
                                     2. Initial performance test required for all control devices to demonstrate
                                      compliance with overall control efficiency requirement. (63.749 (i)(2) and
                                      (i)(3))                                                                   
        Test Methods and Procedures  Procedures provided essentially identical to those for primers and topcoats
                                      for organic HAP and VOC content levels. (63.750 (g), (h), and (k)-(n))    
        Monitoring Requirements....  Same as for primers and topcoats if incinerators are used. (63.751(b))     
        Recordkeeping Requirements.  Same as for primers and topcoats. (63.752(f))                              
        Reporting Requirements.....                                   Semiannual                                
                                     1. Exceedances of organic HAP/VOC limits. (63.753(e)(1), (2) and (7))      
                                     2. Control device exceedances (out of compliance). (63.753(e)(3))          
                                     3. New maskants. (63.753(e)(4))                                            
                                     4. New control devices. (63.753(e)(5))                                     
                                     5. Everything is in compliance. (63.753(e)(6))                             
Waste Handling and Storage                                                                                      
 Operations:                                                                                                    
        Standards..................  Minimize spills during handling and transfer. (63.748)                     
        Test Methods and Procedures  None.                                                                      
        Monitoring Requirements....  None.                                                                      
        Recordkeeping Requirements.  None.                                                                      
        Reporting Requirements.....  None.                                                                      
----------------------------------------------------------------------------------------------------------------
a The EPA promulgated regulations for subpart A of 40 CFR part 63, which were published in the Federal Register 
  on March 16, 1994 at 59 FR 12408.                                                                             


    Section 114(a)(3) of the Act requires enhanced monitoring and 
compliance certifications of all major stationary sources. The annual 
compliance certifications certify whether compliance has been 
continuous or intermittent. Enhanced monitoring shall be capable of 
detecting deviations from each applicable emission limitation or 
standard with sufficient representativeness, accuracy, precision, 
reliability, frequency, and timeliness to determine if compliance is 
continuous during a reporting period. The monitoring in this regulation 
satisfies the requirements of enhanced monitoring.
    Owners or operators of all commercial, civil, or military aerospace 
original equipment manufacturing (OEM) and rework operations with an 
initial startup date before September 1, 1998 that are subject to the 
emission standards are required to achieve compliance with the control 
requirements of the standards within 3 years from September 1, 1995. 
Owners or operators of new commercial, civil, or military aerospace OEM 
and rework operations with initial startup after September 1, 1998 will 
be required to comply with all requirements upon startup.

II. Summary of Considerations in Developing the Rule

A. Purpose of Regulation

    The Act was developed, in part,

to protect and enhance the quality of the Nation's air resources so 
as to promote the public health and welfare and the productive 
capacity of its population [the Act, section 101(b)(1)].

Aerospace facilities are major sources of HAP emissions. The HAP listed 
in Section 112(b)(1) emitted by aerospace facilities that would be 
covered by this final rule include, chromium, cadmium, methylene 
chloride, toluene, xylene, methyl ethyl ketone, ethylene glycol and 
glycol ethers. All of these pollutants can cause reversible or 
irreversible toxic effects following exposure. The range of adverse 
health effects include cancer and a number of other chronic health 
disorders (e.g., aplastic anemia, pancytopenia, pernicious anemia, 
pulmonary (lung) structural changes) and a number of acute health 
disorders (e.g., dyspnea (difficulty in breathing) upper respiratory 
tract irritation with cough, conjunctivitis, neurotoxic effects (e.g., 
visual blurring, tremors, delirium, unconsciousness, coma, 
convulsions). These adverse health effects are associated with a wide 
range of ambient concentrations and exposure times and are influenced 
by source-specific characteristics such as emission rates and local 
meteorological conditions. Health impacts are also dependent on 
multiple factors that affect human variability such as genetics, age, 
health status (e.g., the presence of pre-existing disease) and 
lifestyle.

B. Summary of Impacts

    These standards will reduce nationwide emissions of HAP from at 
least 2,869 major source aerospace manufacturing and rework facilities 
by approximately 112,600 Mg (123,700 tons), or 59 percent, in 1998 
compared to the emissions that would occur in the absence of the 
standards. No significant adverse secondary air, water, solid waste, or 
energy impacts are anticipated 

[[Page 45953]]
from the promulgation of these standards.
    Capital costs will be incurred due to implementation of the 
required control measures. The EPA performed a capital equipment cost 
analysis based on a 15-year equipment life and a 7 percent annual 
interest rate, and calculated annualized capital costs for equipment 
expenditures. It is estimated that implementation of this regulation 
will result in nationwide annual operating and equipment costs for 
existing aerospace manufacturing and rework facilities of $15.3 million 
for control of hand-wipe and flush cleaning, $164 million for solvent-
based chemical milling maskants controlled by a carbon adsorber, $146 
million for water-reducible chemical milling maskants, $622 million for 
depainting with dry media blasting (or a net savings of $38.8 million 
if all affected sources use chemical strippers that contain no organic 
HAP), $2.3 million for control of inorganic HAP emissions from primer 
and topcoat spray application, and $7.8 million for control of 
inorganic HAP emissions from blast depainting operations.
    Total nationwide annual costs, depending on the specific mix of 
control options chosen, are estimated to range from a net savings of 
$49.2 million per year to a net cost of $660 million per year. The 
higher cost figure shown reflects a scenario in which all affected 
sources use blast depainting methods rather than chemical strippers 
that contain no organic HAP. However, due to the high capital cost of 
blast depainting equipment, very few facilities are expected to use 
this option other than those that already own the equipment. Therefore, 
the EPA anticipates the total annual cost of the final rule to be 
approximately $21 million.

III. Significant Changes to the Proposed Standards

A. Public Participation

    Throughout the rulemaking process, the EPA sought and received 
information and views from a broad representation of the public on all 
aspects of the regulation. On May 4 and 5, July 20 and 21, and October 
5 and 6, 1993, and March 7 and 8, 1995, public meetings were held to 
discuss results of the Agency's analysis of control options and 
associated impacts.
    The standards were proposed and the preamble was published in the 
Federal Register on June 6, 1994 (59 FR 29216). The preamble to the 
proposed standards discussed the availability of the regulatory text 
and proposal BID, which described the regulatory alternatives 
considered and the impacts of those alternatives. Public comments were 
solicited at the time of proposal, and copies of the regulatory text 
and BID were distributed to interested parties. Electronic versions of 
the preamble, regulation, and BID were made available to interested 
parties via the EPA's TTN (see ADDRESSES section of this preamble).
    To provide interested persons the opportunity for oral presentation 
of data, views, and arguments concerning the proposed standards, a 
public hearing was offered at proposal. A public hearing was requested 
and was held August 15, 1994. Eleven industry sources presented 
comments at the hearing. The public comment period extended from June 
6, 1994 to September 15, 1994.
    In addition to the original proposal, the EPA also requested 
supplemental information and comment in a Federal Register notice on 
November 22, 1994 (59 FR 60101). The issues on which additional 
information was solicited included the level of control for chemical 
depainting operations, applicability to general aviation facilities, 
VOC and HAP content of exterior primers for commercial aircraft, the 
rolling material balance period for proposed EPA Method 309, regulation 
of chemical milling maskants used with Type I etchants, use of HEPA 
filters to control inorganic HAP emissions from primer and topcoat 
application operations, and reduced recordkeeping requirements for 
facilities using a 2.1 lb/gal or lower organic HAP content primer.

B. Comments on the Proposed Standards

    Comments on the proposed standards and the November 22, 1994 notice 
were received from 57 commenters composed mainly of States, 
environmental groups, control device vendors, industry, and trade 
associations. Most of the 80 comment letters contained multiple 
comments. A detailed discussion of these comments and responses can be 
found in the promulgation BID, which is referred to in the ADDRESSES 
section of this preamble. The summary of comments and responses in the 
BID served as the basis for the revisions that have been made to the 
standards between proposal and promulgation. The comments have been 
divided into the following areas:
    (1) Clarification of and additions to rule applicability and 
exemptions.
    (2) Identification of the specialty coatings that are exempt from 
the rule.
    (3) Exemption of non-HAP, non-VOC cleaning solvents from the rule 
requirements.
    (4) Addition of organic HAP and VOC limitations for self-priming 
topcoats.
    (5) Addition of a low-usage exemption for non-compliant primers, 
topcoats, and chemical milling maskants.
    (6) Acceptable primer/topcoat application techniques.
    (7) New source MACT for inorganic HAP control for application of 
chromium-containing coatings.
    (8) Operating procedures for coating application equipment and 
inorganic HAP control systems.
    (9) Monitoring requirements for organic or inorganic HAP control 
systems.
    (10) Addition of organic HAP emission control requirements for HAP-
containing chemical strippers used in depainting operations.
    (11) Deletion of 99 percent control requirement and EPA Method 5 
test requirement for non-chemical based depainting operations.
    (12) Deletion of waste storage provision for non-RCRA HAP-
containing waste because it was a duplication of RCRA requirements.
    (13) Reduction in recordkeeping for exempt cleaning solvent usage 
from daily to monthly.

C. Significant Changes

    Several changes have been made to these standards since the time 
they were proposed to the public. The majority of the changes have been 
made to clarify portions of the rule that were unclear to the 
commenters. Other changes to the rule were made after reviewing the 
data and arguments submitted by commenters. A summary of the major 
changes is presented below.
    (1) To clarify the coverage of the NESHAP and to respond to 
comments requesting additional exemptions for specialized operations, 
several changes have been made to the rule. While major HAP sources 
containing any degree of aerospace activity are still covered, 
Sec. 63.741 now explicitly states that only aerospace operations at 
these facilities are covered. This section also now clarifies that 
vehicles designed to operate outside the limit of the earth's 
atmosphere will not be covered. Further, only parts and assemblies of 
aerospace vehicles that are critical to structural integrity or flight 
performance are regulated. (This excludes non-flight items such as tray 
tables, etc.) Additional items and processes exempted from the final 
rule include aircraft transparencies, electronic parts and assemblies, 
research and development activities as identified in 

[[Page 45954]]
Section 112(c)(7), and wastewater treatment operations. These items 
were exempted because they are currently regulated under an existing 
EPA regulation or will be covered in a separate NESHAP.
    Comments were received requesting that cleaning solvents containing 
no HAP or VOC be exempted from the housekeeping and composition 
requirements of the standard for cleaning operations. The EPA agrees 
that these formulations should not be covered and has exempted them 
from the rule.
    The inorganic HAP control requirements will not be applicable to 
the painting of non-operational vehicles and components meant for 
display purposes. Additional exemptions will be granted for the 
painting of specific parts that the permitting authority (through a 40 
CFR part 70 permit) has determined cannot be painted in a spray booth. 
The EPA has deleted the proposed exemption cutoff of 4 ft \2\/vehicle 
for touch-up painting and spot stripping with chemical based paint 
removers, due to the difficulty of determining the exact surface areas 
processed on vehicles within a facility. In lieu of the exemption, a 
more specific definition of touch-up and repair painting has been 
adopted such that these operations will be easily identifiable.
    Hand and mechanical sanding depainting operations have been 
specifically deleted from the inorganic HAP control requirements for 
non-chemical depainting.
    For chemical milling maskant operations, the rule will continue to 
cover only those maskants used in Type II etchants (Type I operations 
exempted). The data and information received indicate that compliant 
maskants are not suitable for use in the Type I etchants. Touch-up 
maskants are also now excluded from coverage by the rule. The control 
techniques guideline (CTG) for aerospace operations will address all 
exempted maskants.
    (2) Several commenters requested that the EPA clarify which 
specialty coatings would be exempt from the NESHAP requirements, and 
also asked that definitions be provided in the final rule. The EPA has 
added Appendix B to the rule, which includes definitions for the 
principal specialty coatings that have been identified. The aerospace 
control techniques guideline (CTG) under development by the EPA will 
contain recommended VOC content limits for these coatings.
    (3) The housekeeping, composition, and vapor pressure requirements 
of the cleaning operations standard will now not apply to cleaning 
solvents that do not contain any HAP or VOC. This change will clarify 
that non-polluting cleaners, such as plain water, will not be subject 
to these requirements.
    (4) Self-priming topcoats have been added as a distinct subcategory 
of topcoats with their own HAP and VOC content limits (which are the 
same as for general topcoats). Commenters were concerned that the 
technology for these coatings could proceed at a different rate than 
for other topcoats, necessitating that different limits be set for the 
two classes of topcoats.
    (5) The EPA has added a low-usage exemption to Sec. 63.741 for non-
compliant primers, topcoats, and maskants. This is expected to relieve 
the burden on facilities that have small usage requirements for certain 
non-compliant coatings that are not already exempted as ``specialty 
coatings.'' This exemption allows an annual use of up to 189 l (50 gal) 
per separate formulation, with a combined facility cap of 757 l (200 
gal) per year.
    (6) Electrodeposition dip coating, a high transfer efficiency 
coating process, has been added to the list of acceptable application 
techniques in Sec. 63.745. Additional techniques now deemed acceptable 
due to the difficulty of control and to their very small emissions are 
cotton-tipped swab application, certain airbrush applications, and use 
of hand-held spray (aerosol) cans.
    (7) Data available on advanced filtration techniques indicate that 
the new source MACT control level for application of chromium-
containing coatings consists of either a 3-stage filter system, high 
efficiency particulate air (HEPA) filters, or approved equivalent 
control. These control technologies will be required for spray 
application of chromium-containing coatings at new facilities.
    (8) The proposal contained a requirement to operate coating 
application equipment and inorganic HAP control equipment (dry filters 
and waterwash systems) according to the manufacturer's specifications. 
To respond to comments that many manufacturers' instructions are not 
complete, the EPA has revised these provisions to also allow use of 
either the facility's own procedures or local specified operating 
procedures. Dry filter systems will be exempt from the requirement for 
a startup, shutdown, and malfunction plan. Any painting equipment 
modified by the facility must maintain a transfer efficiency equivalent 
to HVLP and electrostatic spray equipment.
    (9) The proposed monitoring requirement for incinerators in 
Sec. 63.751 has been revised in response to comments to allow the 
alternative of a CEMS in addition to the proposed requirement for a 
temperature monitor. The requirement to monitor the pressure drop 
across waterwash particulate control systems has been deleted because 
this would not provide an indication of performance. Instead, a means 
of continuously monitoring the water flow rate must be installed on the 
system and operated during paint application or removal operations. 
Once per operating shift, the operator must record the flow rate and 
perform a visual check of the continuity and flow characteristics of 
the water curtain, and then shut down the operation immediately if 
problems are noted and take corrective action before restarting the 
operation. Alternative monitoring methods may be approved if the source 
is infrequently operated or the alternative provides a sufficiently 
accurate indication of performance.
    (10) A provision has been added to the final rule that allows the 
use of chemical strippers containing HAP when the emissions are reduced 
by the use of a control system (such as a carbon adsorber). Control 
systems installed before September 1, 1995 will be required to reduce 
HAP and VOC emissions by 81 percent or greater. Systems installed on or 
after this date must achieve a control efficiency of 95 percent or 
greater. These percentage reductions take into account capture and 
destruction or removal efficiencies, as well as the volume of chemical 
stripper used (i.e., a reduction in stripper usage from baseline levels 
will be counted as a credit in determining the effective control 
efficiency of the control system).
    (11) The proposal contained a 99 percent particulate control 
requirement for dry filter systems used to control inorganic HAP 
emissions from depainting. Several commenters took issue with the basis 
for this requirement. The proposal to use EPA Method 5 to verify 
compliance with the requirement was also disputed on the basis that the 
effluent grain loading from these filter systems cannot be measured. 
The EPA agrees with these arguments and has deleted both the 99 percent 
requirement and the use of Method 5. Work practice standards have been 
substituted for these requirements which include maintaining the system 
in good working order, installing a differential pressure gauge across 
the filter media, and replacing the media when the pressure drop is 
outside of the manufacturer's recommended limits. 

[[Page 45955]]

    (12) In response to numerous comments that the proposed requirement 
to store all HAP-containing waste in closed containers was duplicative 
in light of existing RCRA requirements, the EPA has deleted this 
provision. However, the ``housekeeping'' provision requiring handling 
of waste so as to minimize spills has been retained in Sec. 63.748.
    (13) In response to comments, the records pertaining to non-
compliant cleaning solvents used in the specified exempt cleaning 
operations now need not list the parts and assemblies cleaned, but only 
the exempt processes where these solvents were used.
    Three additional issues are being addressed in a supplemental 
rulemaking. They include an expanded emissions averaging scheme that 
would encompass topcoats, primers and maskants; inorganic particulate 
controls; and emission limitations for certain maskants which were 
originally exempt from the proposed NESHAP. Additionally, EPA is 
working with the South Coast Air Quality Management District (SCAQMD) 
and Region IX to ensure that this regulation does not interfere with 
SCAQMD's volatile organic compound trading program. Any revisions to 
Aerospace NESHAP that may be required to mesh the regulation with the 
trading program will also be included in the supplemental rulemaking. 
The proposal for the supplemental notice should appear in the Federal 
Register no later than November, 1995.
IV. Administrative Requirements

A. Docket

    The docket is an organized and complete file of all of the 
information submitted to or otherwise considered by the EPA in the 
development of this rulemaking. The docket is a dynamic file, since 
material is added throughout the rulemaking development. The docketing 
system is intended to allow members of the public and industries 
involved to readily identify and locate documents so that they can 
effectively participate in the rulemaking process. Along with the 
statement of basis and purpose of the proposed and promulgated 
standards and the EPA responses to significant comments, the contents 
of the docket will serve as the record in case of judicial review 
(except for interagency review materials) [section 307(d)(7)(A) of the 
Act].

B. Paperwork Reduction Act

    The information collection requirements contained in this rule have 
been approved by the Office of Management and Budget (OMB) under the 
provisions of the Paperwork Reduction Act, 44 U.S.C. 3501 et seq. and 
have been assigned OMB control number (2060-0341). An Information 
Collection Request (ICR) document has been prepared by the EPA (ICR No. 
1687.02) to reflect the changed information requirements of the final 
rule.
    This collection of information has an estimated reporting burden 
per affected facility of about 73 hours for the first year. In 
subsequent years, the burden will be approximately 55 hours per 
affected facility. These burden estimates include time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, and completing and reviewing the 
collection of information.
    Send comments regarding the burden estimate or any other aspect of 
this collection of information, including suggestions for reducing this 
burden, to Director, Regulatory Information Division; U.S. 
Environmental Protection Agency (Mail code 2136); 401 M Street, SW., 
Washington, DC 20460; and to the Office of Information and Regulatory 
Affairs, Office of Management and Budget, Washington, DC 20503, marked 
``Attention: Desk Officer for EPA.''

C. Executive Order 12866

    Under Executive Order 12866 (58 FR 51735 (October 4, 1993)), the 
EPA is required to determine whether a regulation is ``significant'' 
and therefore subject to OMB review and the requirements of this 
Executive Order to prepare a regulatory impact analysis (RIA). The 
Order defines ``significant regulatory action'' as one that is likely 
to result in a rule that may: (1) Have an annual effect on the economy 
of $100 million or more, or adversely affect in a material way the 
economy, a sector of the economy, productivity, competition, jobs, the 
environment, public health or safety, or State, local, or tribal 
governments or communities; (2) create a serious inconsistency or 
otherwise interfere with an action taken or planned by another agency; 
(3) materially alter the budgetary impact of entitlements, grants, user 
fees, or loan programs or the rights and obligations of recipients 
thereof; or (4) raise novel legal or policy issues arising out of legal 
mandates, the President's priorities, or the principles set forth in 
the Executive Order.
    Pursuant to the terms of Executive Order 12866, it has been 
determined that this rule is a ``significant regulatory action'' within 
the meaning of the Executive Order.

D. Regulatory Flexibility Act

    The Regulatory Flexibility Act (5 U.S.C. 601 et seq.) requires the 
EPA to consider potential impacts of regulations on small business 
``entities.'' If a preliminary analysis indicates that a regulation 
would have a significant economic impact on 20 percent or more of small 
entities, a regulatory flexibility analysis must be prepared. Since the 
final rule applies only to major sources as defined in section 112(a) 
of the Act, the EPA certifies that there will not be a significant 
impact on a substantial number of small entities. Consequently, a 
regulatory flexibility analysis is not required and has not been 
prepared.

E. Regulatory Review

    In accordance with sections 112(d)(6) and 112(f)(2) of the Act, 
this regulation will be reviewed within 8 years from the date of 
promulgation. This review may include an assessment of such factors as 
evaluation of the residual health risk, any overlap with other 
programs, the existence of alternative methods of control, 
enforceability, improvements in emission control technology and health 
data, and the recordkeeping and reporting requirements.

F. Unfunded Mandate Act

    The economic impact analysis performed prior to proposal showed 
that the economic impacts from implementation of the proposed standards 
would not be ``significant'' as defined in Executive Order 12866 (see 
Section IV.C). No changes have been made to the proposed rule that 
would increase the economic impacts to a level that would be considered 
significant.
    This final rule is estimated to result in a total cost of $21 
million per year, however, expenditures by State, local, and tribal 
governments or the private sector are estimated at more than $100 
million in any one year. The lower costs are the result of the savings 
incurred by the pollution prevention measures used as the basis for the 
rule.
    The Agency has prepared the following statement of impact to be 
considered in response to the requirements of the Unfunded Mandates 
Act.
    There are no federal funds available to assist State, local, and 
tribal governments in meeting these costs. There are important benefits 
from VOC and HAP emission reductions because these compounds have 
significant, adverse impacts on human health and welfare and on the 
environment. The rule does not have any disproportionate budgetary 
effects on any particular region of the nation, any State, local, or 

[[Page 45956]]
tribal government, or urban or rural or other type of community. On the 
contrary, the rule will result in only a minimal increase in the 
average product rates (less than 1 percent). Moreover, the rule will 
not have a material effect on the national economy.
    Prior to issuing this rule, the EPA provided numerous opportunities 
(e.g. public comment period; public hearing; Roundtable meetings with 
industry, trade associations, state and local air pollution 
representatives; environmental groups; State, local, and tribal 
governments; and concerned citizens) for consultation with interested 
parties. In general, State and local environmental agencies advocated 
that EPA adopt more stringent environmental controls. The Agency 
evaluated the comments and concerns, and the final rule reflects, to 
the extent consistent with section 112 of the Act, those comments and 
concerns. While small governments are not significantly or uniquely 
affected by the rule, these procedures, as well as additional public 
conferences and meetings, gave small governments an opportunity to give 
meaningful and timely input and obtain information, education, and 
advice on compliance.
    The Agency considered several regulatory options in developing the 
rule. The options selected in the final rule are the least costly and 
least burdensome alternatives currently available for achieving the 
objectives of section 112 of the Act. The cost effectiveness for this 
regulation is $170 per ton and all but one of the regulatory options 
selected are based on pollution prevention measures. Finally, after 
careful consideration of the costs, the environmental impacts and the 
comments, the Agency decided that the MACT floor was the appropriate 
level of control for this regulation.

List of Subjects

40 CFR Part 9

    Environmental protection, Reporting and recordkeeping requirements.

40 CFR Part 63

    Environmental protection, Air pollution control, Hazardous 
substances, Incorporation by reference, Reporting and recordkeeping 
requirements.

    Dated: July 31, 1995.
Carol M. Browner,
Administrator.

    For reasons set out in the preamble, parts 9 and 63 of title 40, 
chapter I, of the Code of Federal Regulations are amended as follows:

PART 9--[AMENDED]

    1. The authority citation for part 9 continues to read as follows:

    Authority: 7 U.S.C. 135 et seq., 136-136y; 15 U.S.C. 2001, 2003, 
2005, 2006, 2601-2671; 21 U.S.C 331j, 346a, 348; 31 U.S.C. 9701; 33 
U.S.C. 1251 et seq., 1311, 1313d, 1314, 1321, 1326, 1330, 1344, 1345 
(d) and (e), 1361; E.O. 11735, 38 FR 21243, 3 CFR 1971-1975 Comp., 
p. 973; 42 U.S.C. 241, 242b, 243, 246, 300f, 300g, 300g-1, 300g-2, 
300g-3, 300g-4, 300g-5, 300g-6, 300j-1, 300j-2, 300j-3, 300j-4, 
300j-9, 1857 et seq., 6901-6992k, 7401-7671q, 7542, 9601-9657, 
11023, 11048.

    2. Section 9.1 is amended by adding a new entry to the table under 
the indicated heading to read as follows:
Sec. 9.1   OMB approvals under the Paperwork Reduction Act.

* * * * *

                                                                        
                40 CFR citation                      OMB control No.    
                                                                        
       *                  *                  *                  *       
                  *                  *                  *               
National Emission Standards for Hazardous Air                           
 Pollutants for Source Categories..............                         
       *                  *                  *                  *       
                  *                  *                  *               
63.752-63.753                                                  2060-0341
                                                                        
       *                  *                  *                  *       
                  *                  *                  *               

PART 63--[AMENDED]

    3. The authority citation for part 63 continues to read as follows:

    Authority: 42 U.S.C. 7401, et seq.

    4. Part 63 is amended by adding a new subpart GG consisting of 
Secs. 63.740 through 63.759 to read as follows:

Subpart GG--National Emission Standards for Aerospace Manufacturing and 
Rework Facilities

Sec.
63.741  Applicability and designation of affected sources.
63.742  Definitions.
63.743  Standards: General.
63.744  Standards: Cleaning operations.
63.745  Standards: Primer and topcoat application operations.
63.746  Standards: Depainting operations.
63.747  Standards: Chemical milling maskant application operations.
63.748  Standards: Handling and storage of waste.
63.749  Compliance dates and determinations.
63.750  Test methods and procedures.
63.751  Monitoring requirements.
63.752  Recordkeeping requirements.
63.753  Reporting requirements.
63.754-63.759  Reserved.

SUBPART GG--NATIONAL EMISSION STANDARDS FOR AEROSPACE MANUFACTURING 
AND REWORK FACILITIES


Sec. 63.741   Applicability and designation of affected sources.

    (a) This subpart applies to facilities that are engaged, either in 
part or in whole, in the manufacture or rework of commercial, civil, or 
military aerospace vehicles or components and that are major sources as 
defined in Sec. 63.2.
    (b) The owner or operator of an affected source shall comply with 
the requirements of this subpart and of subpart A of this part, except 
as specified in Sec. 63.743(a).
    (c) Affected sources. The affected sources to which the provisions 
of this subpart apply are specified in Sec. 63.741(c)(1) through (6). 
The activities subject to this subpart are limited to the manufacture 
or rework of aerospace vehicles or components as defined in this 
subpart, except for requirements pertaining to cleaning solvents. 
Paragraphs (c)(2) through (c)(6) of this section are not applicable to 
non-aerospace activities.
    (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 affected source.
    (2) Each primer application operation, which is the total of all 
primer applications at the facility.
    (3) Each topcoat application operation, which is the total of all 
topcoat applications at the facility.
    (4) Each depainting operation, which is the total of all depainting 
at the facility.
    (5) Each chemical milling maskant application operation, which is 
the total of all chemical milling maskant applications at the facility.

[[Page 45957]]

    (6) Each waste storage and handling operation, which is the total 
of all waste handling and storage at the facility.
    (d) An owner or operator of an affected source subject to this 
subpart shall obtain an operating permit from the permitting authority 
in the State in which the source 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) 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 requirements for use of 
specialty coatings, adhesives, adhesive bonding primers, or sealants at 
aerospace facilities. It also does not regulate research and 
development, quality control, and laboratory testing activities, 
chemical milling, metal finishing, electrodeposition (except for 
electrodeposition of paints), composites processing (except for 
cleaning and coating of composite parts or components that become part 
of an aerospace vehicle or component as well as composite tooling that 
comes in contact with such composite parts or components prior to 
cure), electronic parts and assemblies (except for cleaning and 
topcoating of completed assemblies), manufacture of aircraft 
transparencies, and wastewater operations at aerospace facilities. 
These requirements also do not apply to parts and assemblies not 
critical to the vehicle's structural integrity or flight performance or 
to vehicles that are designed to travel beyond the limit of the earth's 
atmosphere. The requirements of this subpart also do not apply to 
primers, topcoats, chemical milling maskants, strippers, and cleaning 
solvents containing HAP or VOC at a concentration less than 0.1% for 
carcinogens or 1.0% for noncarcinogens, as determined from 
manufacturer's representations. Additional specific exemptions from 
regulatory coverage are set forth in Sec. 63.741(e), .744(a)(1), (b), 
(e), .745(a), (f)(3), (g)(4), .746(a), (b)(5), .747(c)(3), and .749(d).
    (g) The requirements for primers, topcoats, and chemical milling 
maskants in Sec. 63.745 and Sec. 63.747 do not apply to the use of low-
volume coatings in these categories for which the annual total of each 
separate formulation used at a facility does not exceed 189 l (50 gal), 
and the combined annual total of all such primers, topcoats, and 
chemical milling maskants used at a facility does not exceed 757 l (200 
gal). Primers and topcoats exempted under paragraph (f) of this section 
and under Sec. 63.745(f)(3) and (g)(4) are not included in the 50 and 
200 gal limits. Chemical milling maskants exempted under 
Sec. 63.747(c)(3) are also not included in these limits.


Sec. 63.742  Definitions.
    Terms used in this subpart are defined in the Act, in subpart A of 
this part, or in this section as follows:
    Aerospace facility means any facility that produces, reworks, or 
repairs in any amount any commercial, civil, or military aerospace 
vehicle or component.
    Aerospace vehicle or component means any fabricated part, processed 
part, assembly of parts, or completed unit, 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 handle hydraulic 
fluids, fuel, cooling fluids, or oils.
    Aircraft transparency means the aircraft windshield, which is 
typically constructed of laminated layers of glass and other 
transparent materials.
    Carbon adsorber means one vessel in a series of vessels in a carbon 
adsorption system that contains carbon and is used to remove gaseous 
pollutants from a gaseous emission source.
    Carbon Adsorber control efficiency means the total efficiency of 
the control system, determined by the product of the capture efficiency 
and the control device efficiency.
    Chemical milling maskant means a coating that is applied directly 
to aluminum components to protect surface areas when chemical milling 
the component with a Type II etchant. This does not include maskants 
used with Type I etchants, bonding maskants, line sealers, and critical 
use and seal coat maskants. Additionally, maskants that must be used on 
an individual part or subassembly with a combination of Type II 
etchants and any of the above types of maskants (e.g. Type I 
compatible, bonding, line sealers, and critical use and seal coat) are 
also exempt from this subpart.
    Chemical milling maskant application operation means application of 
chemical milling maskant for use in Type II chemical milling etchants.
    Cleaning operation means collectively spray gun, hand-wipe, and 
flush cleaning operations.
    Cleaning solvent means a liquid material used for hand-wipe, spray 
gun, or flush cleaning. This definition does not include solutions that 
contain no HAP or VOC.
    Coating means a material that is applied to the surface of an 
aerospace vehicle or component to form a decorative or functional solid 
film, or the solid film itself.
    Coating operation means the use of a spray booth, tank, or other 
enclosure or any area, such as a hangar, for the application of a 
single type of coating (e.g., primer); the use of the same spray booth 
for the application of another type of coating (e.g., topcoat) 
constitutes a separate coating operation for which compliance 
determinations are performed separately.
    Coating unit means a series of one or more coating applicators and 
any associated drying area and/or oven wherein a coating is applied, 
dried, and/or cured. A coating unit ends at the point where the coating 
is dried or cured, or prior to any subsequent application of a 
different coating. It is 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 enough 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 other spaces that have limited means of 
entry); and (3) is not suitable for continuous employee occupancy.
    Control device means destruction and/or recovery equipment used to 
destroy or recover HAP or VOC emissions generated by a regulated 
operation.
    Control system means a combination of pollutant capture system(s) 
and control device(s) used to reduce discharge to the atmosphere of HAP 
or VOC emissions generated by a regulated operation.
    Depainting means the removal of a permanent coating from the outer 
surface of an aerospace vehicle or component, whether by chemical or 
non-chemical means. For non-chemical means, this definition excludes 
hand and mechanical sanding, and any other non-chemical removal 
processes that do not involve blast media or other mechanisms that 
would result in airborne particle movement at high velocity.
    Depainting operation means the use of a chemical agent, media 
blasting, or any other technique to remove permanent coatings from the 
outer surface of an aerospace vehicle or components. The depainting 
operation 

[[Page 45958]]
includes washing of the aerospace vehicle or component to remove 
residual stripper, media, or coating residue.
    Electrodeposition of paint means the application of a coating using 
a water-based electrochemical bath process. 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. The electric potential causes the ionized coating to be 
electrically attracted, migrated, and deposited on the component being 
coated.
    Electrostatic spray means a method of applying a spray coating in 
which an electrical charge is applied to the coating and the substrate 
is grounded. The coating is attracted to the substrate by the 
electrostatic potential between them.
    Exempt solvent means specified organic compounds that have been 
determined by the EPA to have negligible photochemical reactivity and 
are listed in 40 CFR 51.100.
    Flush cleaning means the removal of contaminants such as dirt, 
grease, oil, and coatings from an aerospace vehicle or component or 
coating equipment by passing solvent over, into, or through the item 
being cleaned. The solvent may simply 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 other hand action are used are not included.
    Hand-wipe cleaning operation means the removal of contaminants such 
as dirt, grease, oil, and coatings from an aerospace vehicle or 
component by physically rubbing 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 pollutant 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 efficiency for 0.3 micron aerosol.
    High volume low pressure (HVLP) spray equipment means spray 
equipment that is used to apply coating by means of a spray gun that 
operates at 10.0 psig or less at the air cap and a fluid delivery 
pressure of 100 psig or less.
    Inorganic hazardous air pollutant (HAP) means any HAP that is not 
organic.
    Leak means any visible leakage, including misting and clouding.
    Limited access space means internal surfaces or passages of an 
aerospace vehicle or component that cannot be reached without the aid 
of an airbrush or a spray gun extension for the application of 
coatings.
    Mechanical sanding means aerospace vehicle or component surface 
conditioning which uses directional and random orbital abrasive tools 
and aluminum oxide or nylon abrasive pads for the purpose of corrosion 
rework, substrate repair, prepaint surface preparation, and other 
maintenance activities.
    Natural draft opening means any opening in a room, building, or 
total enclosure that remains open during operation of the facility and 
that is not connected to a duct in which a fan is installed. The rate 
and direction of the natural draft through such an opening is a 
consequence of the difference in pressures on either side of the wall 
containing the opening.
    Non-chemical based depainting equipment means any depainting 
equipment or technique, including, but not limited to, media blasting 
equipment, that can depaint an aerospace vehicle or component in the 
absence of a chemical stripper. This definition does not include 
mechanical sanding or hand sanding.
    Nonregenerative carbon adsorber means a carbon adsorber vessel in 
which the spent carbon bed does not undergo carbon regeneration in the 
adsorption vessel.
    Operating parameter value means a minimum or maximum value 
established for a control device or process parameter which, if 
achieved by itself or in combination with one or more other operating 
parameter values, determines that an owner 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 layers of 
identically formulated coating applied to the surface of an aerospace 
vehicle or component. Primers are typically used for corrosion 
prevention, protection from the environment, functional fluid 
resistance, and adhesion of subsequent coatings. Coatings that are 
defined as specialty coatings are not included under this definition.
    Radome means the non-metallic protective housing for 
electromagnetic transmitters and receivers (e.g., radar, electronic 
countermeasures, etc.).
    Research and Development means an operation whose primary purpose 
is for research and development of new processes and products, that is 
conducted under the close supervision of technically trained personnel, 
and is not involved in the manufacture of final or intermediate 
products for commerical purposes, except in a de mimnimis manner.
    Self-priming topcoat means a topcoat that is applied directly to an 
uncoated aerospace vehicle or component for purposes of corrosion 
prevention, environmental protection, and functional fluid resistance. 
More than one layer of identical coating formulation may be applied to 
the vehicle or component. The coating is not subsequently topcoated 
with any other product formulation.
    Semi-aqueous cleaning solvent means a solution in which 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 aerospace vehicle or 
component to degrade coatings such as primers and topcoats 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 supplied information.
    Solids means the non-volatile portion of the coating which after 
drying makes up the dry film.
    Space vehicle means a man-made device, either manned or unmanned, 
designed for operation beyond earth's atmosphere. This definition 
includes integral equipment such as models, mock-ups, prototypes, 
molds, jigs, tooling, hardware jackets, and test coupons. Also included 
is auxiliary equipment associated with test, transport, and storage, 
which through contamination 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 specific applications. These performance 
criteria may include, but are not limited to, temperature or fire 
resistance, substrate compatibility, antireflection, temporary 
protection or marking, sealing, adhesively joining substrates, or 
enhanced corrosion protection.
    Spot stripping means the depainting of an area where it is not 
technically feasible to use a non-chemical depainting technique.
    Spray gun means a device that atomizes a coating or other material 
and projects the particulates or other material onto a substrate. 

[[Page 45959]]

    Stripper means a liquid that is applied to an aerospace vehicle or 
component to remove permanent coatings such as primers and topcoats.
    Surface preparation means the removal of contaminants from the 
surface of an aerospace vehicle or component, or the activation or 
reactivation of the surface in preparation for the application of a 
coating.
    Temporary total enclosure means a total enclosure that is 
constructed for the sole purpose of measuring the emissions from an 
affected source that are not delivered to an emission control device. A 
temporary total enclosure must be constructed 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 conforms to the requirements found in Sec. 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 
approval of a temporary enclosure on a case-by-case basis.
    Topcoat means a coating that is applied over a primer on an 
aerospace vehicle or component for appearance, identification, 
camouflage, or protection. Coatings that are defined as specialty 
coatings are not included under this definition.
    Total enclosure means a permanent structure that is constructed 
around a gaseous emission source so that all gaseous pollutants emitted 
from the source are collected and ducted through a control device, such 
that 100% capture efficiency is achieved. There are no fugitive 
emissions from a total enclosure. The only openings in a total 
enclosure are 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 windows are closed during 
routine operation of the enclosed source. Brief, occasional openings of 
such doors or windows to accommodate process equipment adjustments are 
acceptable, but if such openings are routine or if an access door 
remains open during the entire operation, the access door must be 
considered a natural draft opening. The average inward face velocity 
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 that meets the requirements 
found in Sec. 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 application of coating used to cover 
minor imperfections in the coating finish or to achieve complete 
coverage. This definition includes out-of-sequence or out-of-cycle 
coating.
    Two-stage filter system means a dry particulate filter system using 
two layers of filter media to remove particulate. The first stage is 
designed to remove the bulk of the particulate and a higher efficiency 
second stage is designed to remove smaller particulate.
    Type II etchant means a chemical milling etchant that is a strong 
sodium hydroxide solution containing amines (Type I etchants contain 
varying amounts of dissolved sulfur and do not contain 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 exempt solvent. For purposes of 
determining compliance with emission limits, VOC will be measured by 
the approved test methods. Where such a method also inadvertently 
measures compounds that are exempt solvent, an owner or operator may 
exclude these exempt solvents when determining compliance with an 
emission standard.
    Waterwash system means a control system that utilizes flowing water 
to remove particulate emissions from the exhaust air stream in spray 
coating application or dry media blast depainting operations.
    Nomenclature for determining carbon adsorber efficiency--The 
nomenclature defined below is used in Sec. 63.750(g):
    (1) Ak = the area of each natural draft opening (k) in a total 
enclosure, in square meters.
    (2) Caj = the concentration of HAP or VOC in each gas stream 
(j) exiting the emission control device, in parts per million by 
volume.
    (3) Cbi = the concentration of HAP or VOC in each gas stream 
(i) entering the emission control device, in parts per million by 
volume.
    (4) Cdi = the concentration of HAP or VOC in each gas stream 
(i) entering the emission control device from the affected source, in 
parts per million by volume.
    (5) Cfk = 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 volume.
    (6) Cgv = the concentration of HAP or VOC in each uncontrolled 
gas stream entering each individual carbon adsorber vessel (v), in 
parts per million by volume. For the purposes of calculating the 
efficiency of the individual carbon adsorber vessel, Cgv may be 
measured in the carbon adsorption system's common inlet duct prior to 
the branching of individual inlet ducts to the individual carbon 
adsorber vessels.
    (7) Chv = the concentration of HAP or VOC in the gas stream 
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 fraction).
    (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 all natural draft 
openings in a total enclosure, in meters per hour.
    (11) Hv = the individual carbon adsorber vessel (v) efficiency 
achieved for the duration of the emission test (expressed as a 
fraction).
    (12) Hsys = the efficiency of the carbon adsorption system 
calculated when each carbon adsorber vessel has an individual exhaust 
stack (expressed as a fraction).
    (13) Mci = 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 appropriate, as determined 
from records at the affected source. This quantity shall be determined 
at a time and location in the process after all ingredients (including 
any dilution solvent) have been added to the coating, or if ingredients 
are added after the mass of the coating has been determined, 
appropriate adjustments shall be made to account for them.
    (14) Mr = the total mass in kilograms of HAP or VOC recovered 
for a 7 to 30-day period.
    (15) Qaj = the volumetric flow rate of each gas stream (j) 
exiting the emission control device in either dry standard cubic meters 
per hour when EPA Method 18 in appendix A of part 60 is used to measure 
HAP or VOC concentration or in standard cubic meters per hour (wet 
basis) when EPA Method 25A is used to measure HAP or VOC concentration.
    (16) Qbi = the volumetric flow rate of each gas stream (i) 
entering the emission control device, in dry standard cubic meters per 
hour when EPA Method 18 is used to measure HAP or VOC concentration or 
in standard cubic meters per hour (wet basis) when EPA Method 25A is 
used to measure HAP or VOC concentration. 

[[Page 45960]]

    (17) Qdi = the volumetric flow rate of each gas stream (i) 
entering the emission control device from the affected source in either 
dry standard cubic meters per hour when EPA Method 18 is used to 
measure HAP or VOC concentration or in standard cubic meters per hour 
(wet basis) when EPA Method 25A is used to measure HAP or VOC 
concentration.
    (18) Qfk = the volumetric flow rate of each uncontrolled gas 
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 concentration or in standard cubic meters per 
hour (wet basis) when EPA Method 25A is used to measure HAP or VOC 
concentration.
    (19) Qgv = 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 to measure 
HAP or VOC concentration or in standard cubic meters per hour (wet 
basis) when EPA Method 25A is used to measure HAP or VOC concentration. 
For purposes of calculating the efficiency of the individual carbon 
adsorber vessel, the value of Qgv can be assumed to equal the 
value of Qhv measured for that carbon adsorber vessel.
    (20) Qhv = 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 is used to measure HAP or VOC 
concentration or in standard cubic meters per hour (wet basis) when EPA 
Method 25A is used to measure HAP or VOC concentration.
    (21) Qini = the volumetric flow rate of each gas stream (i) 
entering the total enclosure through a forced makeup air duct in 
standard cubic meters per hour (wet basis).
    (22) Qoutj = 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) RSi = the total mass in kilograms of HAP or VOC retained 
in the coating after drying.
    (25) Woi = 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 process after all ingredients (including any 
dilution solvent) have been added to the coating, or if ingredients are 
added after the weight fraction of HAP or VOC in the coating has been 
determined, appropriate adjustments shall be made to account for them.


Sec. 63.743  Standards: General.

    (a) Except as provided in paragraphs (a)(4) through (a)(9) of this 
section and in Table 2 (included in Appendix B to this subpart), each 
owner or operator of an affected source subject to this subpart is also 
subject to the following sections of subpart A of this part:
    (1) Sec. 63.4, Prohibited activities and circumvention;
    (2) Sec. 63.5, Construction and reconstruction; and
    (3) Sec. 63.6, Compliance with standards and maintenance 
requirements.
    (4) For the purposes of this subpart, all affected sources shall 
submit any request for an extension of compliance not later than 120 
days before the affected source's compliance date. The extension 
request should be requested for the shortest time necessary to attain 
compliance, but in no case shall exceed 1 year.
    (5)(i) For the purposes of this subpart, the Administrator (or the 
State with an approved permit program) will notify the owner or 
operator in writing of his/her intention to deny approval of a request 
for an extension of compliance submitted under either Sec. 63.6(i)(4) 
or Sec. 63.6(i)(5) within 60 calendar 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 calendar days after receipt of 
sufficient information to evaluate a request for an extension of 
compliance, then the request shall be considered approved.
    (6)(i) For the purposes of this subpart, the Administrator (or the 
State) will notify the owner or operator in writing of the status of 
his/her application submitted under Sec. 63.6(i)(4)(ii) (that is, 
whether the application contains sufficient information to make a 
determination) within 30 calendar days after receipt of the original 
application and within 30 calendar days after receipt of any 
supplementary information that is submitted, rather than 15 calendar 
days as provided for in Sec. 63.6(i)(13)(i).
    (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 calendar days after receipt of 
the original application and within 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 
sufficient upon which to make a determination.
    (7) For the purposes of this subpart, each owner or operator who 
has submitted an extension request application under Sec. 63.6(i)(5) is 
to be provided 30 calendar days to present additional information or 
arguments to the Administrator after he/she is notified that the 
application is not complete, rather than 15 calendar days as provided 
for in Sec. 63.6(i)(13)(ii).
    (8) For the purposes of this subpart, each owner or operator is to 
be provided 30 calendar days to present additional information to the 
Administrator after he/she is notified of the intended denial of a 
compliance extension request submitted under either Sec. 63.6(i)(4) or 
Sec. 63.6(i)(5), rather than 15 calendar days as provided for in 
Sec. 63.6(1)(12)(iii)(B) and Sec. 63.6(i)(13)(iii)(B).
    (9) For the purposes of this subpart, a final determination to deny 
any request for an extension submitted under either Sec. 63.6(i)(4) or 
Sec. 63.6(i)(5) will be made within 60 calendar days after presentation 
of additional information or argument (if the application is complete), 
or within 60 calendar days after the final date specified for the 
presentation if no presentation is made, rather than 30 calendar days 
as provided for in Sec. 63.6(i)(12)(iv) and Sec. 63.6(i)(13)(iv).
    (b) Operation and maintenance plan. Each owner or operator that 
uses an air pollution control device or equipment to control HAP 
emissions shall prepare and operate in accordance with a startup, 
shutdown, and malfunction plan in accordance with Sec. 63.6. Dry 
particulate filter systems operated per the manufacturer's instructions 
are exempt from a startup and shutdown plan. A startup and shutdown 
plan shall be prepared for facilities using locally prepared operating 
procedures. In addition to the information required in Sec. 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 
standardized checklist to document the operation and maintenance of the 
equipment;
    (2) The plan shall include a systematic procedure for identifying 
malfunctions and for reporting them immediately to supervisory 
personnel; and
    (3) The plan shall specify procedures to be followed to ensure that 
equipment 

[[Page 45961]]
or process malfunctions due to poor maintenance or other preventable 
conditions do not occur.
    (c) An owner or operator who uses an air pollution control device 
or equipment not listed in this subpart shall submit a description of 
the device or equipment, test data verifying the performance of the 
device or equipment in controlling organic HAP and/or VOC emissions, as 
appropriate, specific operating parameters that will be monitored to 
establish compliance with the standards, and a copy of the operation 
and maintenance plan referenced in paragraph (b) of this section to the 
Administrator for approval.


Sec. 63.744  Standards: Cleaning operations.

    (a) Housekeeping measures. Each owner or operator of a new or 
existing cleaning operation subject to this subpart shall comply with 
the requirements in this paragraphs unless the solvent used is 
classified as a cleaning solvent that contains no organic HAP or VOC as 
identified in Table 3.

    Table 3.--Composition Requirements for Approved Cleaning Solvents   
------------------------------------------------------------------------
  Cleaning solvent type               Composition requirements          
------------------------------------------------------------------------
Aqueous..................  Cleaning solvents in which water is the      
                            primary ingredient (80 percent of
                            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  deg.C   
                            (200  deg.F) (as reported by the            
                            manufacturer) and the solution must be      
                            miscible with water.                        
Hydrocarbon-Based........  Cleaners that are composed of a mixture of   
                            photochemically reactive hydrocarbons and   
                            oxygenated hydrocarbons and have a maximum  
                            vapor pressure of 7 mm Hg at 20  deg.C (3.75
                            in. H2O at 68  deg.F). These cleaners also  
                            contain no HAP or ozone depleting compounds.
------------------------------------------------------------------------

    (1) Place solvent-laden cloth, paper, or any other absorbent 
applicators used for cleaning aerospace vehicles or components in bags 
or other closed containers immediately after use. Ensure that these 
bags and containers are kept closed at all times except when depositing 
or removing these materials from the container. Use bags and containers 
of such design so as to contain the vapors of the cleaning solvent. 
Cotton-tipped swabs used for very small cleaning operations are exempt 
from this requirement.
    (2) Store fresh and spent cleaning solvents used in aerospace 
cleaning operations in closed containers.
    (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.
    (b) Hand-wipe cleaning. Each owner or operator of a new or existing 
hand-wipe cleaning operation (excluding cleaning of spray gun equipment 
performed in accordance with paragraph (c)(3) of this section) subject 
to this subpart shall use cleaning solvents that meet one of the 
requirements specified in paragraphs (b)(1), (b)(2), and (b)(3) of this 
section. Cleaning solvent solutions that contain no HAP or VOC are 
exempt from the requirements in paragraphs (b)(1), (b)(2), and (b)(3).
    (1) Meet one of the composition requirements in Table 3;
    (2) Have a composite vapor pressure of 45 mm Hg (24.1 in. H2O) 
or less at 20  deg.C (68  deg.F); or
    (3) Demonstrate that the volume of hand-wipe solvents used in 
cleaning operations has been reduced by at least 60% from a baseline 
adjusted for production. The baseline shall be established as part of 
an approved alternative plan administered by the State. The alternative 
plan shall be submitted by the State under section 112(l) of the Act 
and approved by the Administrator, and shall demonstrate that the 60% 
volume reduction in cleaning solvents provides equivalent reductions to 
the requirements in paragraph (b)(1) or (b)(2).
    (c) Spray gun cleaning. Each owner or operator of a new or existing 
spray gun cleaning operation subject to this subpart in which spray 
guns are used for the application of coatings or any other materials 
that require the spray guns to be cleaned shall use one or more of the 
techniques, or their equivalent, specified in paragraphs (c)(1) through 
(c)(4) of this section.
    (1)(i) Enclosed system. Clean the spray gun in an enclosed system 
that is closed at all times except when inserting or removing the spray 
gun. Cleaning shall consist of forcing solvent through the gun.
    (ii) If leaks are found during the monthly inspection required in 
Sec. 63.751(a), repairs shall be made as soon as practicable, but no 
later than 15 days after the leak was found. If the leak is not 
repaired by the 15th day after detection, the solvent shall be removed 
and the enclosed cleaner shall be shut down until the leak is repaired 
or its use is permanently discontinued.
    (2) Nonatomized cleaning. Clean the spray gun by placing solvent in 
the pressure pot and forcing it through the gun with the atomizing cap 
in place. No atomizing air is to be used. Direct the solvent from the 
spray gun into a vat, drum, or other waste container that is closed 
when not in use.
    (3) Disassembled spray gun cleaning. Disassemble the spray gun and 
clean the components by hand in a vat, which shall remain closed at all 
times except when in use. Alternatively, soak the components in a vat, 
which shall remain closed during the soaking period and when not 
inserting or removing components.
    (4) Atomizing cleaning. Clean the spray gun by forcing the solvent 
through the gun and direct the resulting atomized spray into a waste 
container that is fitted with a device designed to capture the atomized 
solvent emissions.
    (d) Flush cleaning. Each owner or operator of a flush cleaning 
operation subject to this subpart (excluding those in which Table 3 or 
semi-aqueous cleaning solvents are used) shall empty the used cleaning 
solvent each time an aerospace part or assembly, or a component of a 
coating unit (with the exception of spray guns) is flush cleaned into 
an enclosed container or collection system that is kept closed when not 
in use or into a system with equivalent emission control.
    (e) Exempt cleaning operations. The following cleaning operations 
are exempt from the requirements of paragraph (b) of this section:
    (1) Cleaning during the manufacture, assembly, installation, or 
testing of components of breathing oxygen systems that are exposed to 
the breathing oxygen; 

[[Page 45962]]

    (2) Cleaning during the manufacture, assembly, installation, or 
testing of parts, subassemblies, or assemblies that are exposed to 
strong oxidizers or reducers (e.g., nitrogen tetroxide, liquid oxygen, 
or hydrazine);
    (3) Cleaning and surface activation prior to adhesive bonding;
    (4) Cleaning of electronic parts and assemblies containing 
electronic parts;
    (5) Cleaning of aircraft and ground support equipment fluid systems 
that are exposed to the fluid, including air-to-air heat exchangers and 
hydraulic fluid systems;
    (6) Cleaning of fuel cells, fuel tanks, and confined spaces;
    (7) Surface cleaning of solar cells, coated optics, and thermal 
control surfaces;
    (8) Cleaning during fabrication, assembly, installation, and 
maintenance of upholstery, curtains, carpet, and other textile 
materials used in the interior of the aircraft;
    (9) Cleaning of metallic and non-metallic materials used in 
honeycomb cores during the manufacture of these cores, and cleaning of 
the completed cores used in the manufacture of aerospace vehicles or 
components;
    (10) Cleaning of polycarbonate or glass substrates; and
    (11) Cleaning and solvent usage associated with research and 
development, quality control, and laboratory testing.
    (12) Cleaning operations, using nonflamable liquids, conducted 
within five feet of energized electrical systems. Energized electrical 
systems means any AC or DC electrical circuit on an assembled aircraft 
once electrical power is connected, including interior passenger and 
cargo areas, wheel wells and tail sections.


Sec. 63.745  Standards: Primer and topcoat application operations.

    (a) Each owner or operator of a new or existing primer or topcoat 
application operation subject to this subpart shall comply with the 
requirements specified in paragraph (c) of this section for those 
coatings that are uncontrolled (no control device is used to reduce 
organic HAP emissions from the operation), and in paragraph (d) of this 
section for those coatings that are controlled (organic HAP emissions 
from the operation are reduced by the use of a control device). 
Aerospace equipment that is no longer operational, intended for public 
display, and not easily capable of being moved is exempt from the 
requirements of this section.
    (b) Each owner or operator shall conduct the handling and transfer 
of primers and topcoats to or from containers, tanks, vats, vessels, 
and piping systems in such a manner that minimizes spills.
    (c) Uncontrolled coatings--organic HAP and VOC content levels. Each 
owner or operator shall comply with the organic HAP and VOC content 
limits specified in paragraphs (c)(1) through (c)(4) of this section 
for those coatings that are uncontrolled.
    (1) Organic HAP emissions from primers shall be limited to an 
organic HAP content level of no more than 350 g/l (2.9 lb/gal) of 
primer (less water) as applied.
    (2) VOC emissions from primers shall be limited to an VOC content 
level of no more than 350 g/l (2.9 lb/gal) of primer (less water and 
exempt solvents) as applied.
    (3) Organic HAP emissions from topcoats shall be limited to an 
organic HAP content level of no more than 420 g/l (3.5 lb/gal) of 
coating (less water) as applied. 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 topcoat (less water) as 
applied.
    (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. VOC emissions from self-priming topcoats 
shall be limited to a VOC content level of no more than 420 g/l (3.5 
lb/gal) of self-priming topcoat (less water and exempt solvents) as 
applied.
    (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, taking into account capture and 
destruction or removal efficiencies, as determined using the procedures 
in Sec. 63.750(g) when a carbon adsorber is used and in Sec. 63.750(h) 
when a control device other than a carbon adsorber is used.
    (e) Compliance methods. Compliance with the organic HAP and VOC 
content limits specified in paragraphs (c)(1) through (c)(4) of this 
section shall be accomplished by using the methods specified in 
paragraphs (e)(1) and (e)(2) of this section either by themselves or in 
conjunction with one another.
    (1) Use primers and topcoats with HAP and VOC content levels equal 
to or less than the limits specified in paragraphs (c)(1) through 
(c)(4) of this section.
    (2)(i) Use any combination of primers or topcoats such that the 
monthly volume-weighted average organic HAP and VOC contents of the 
combination of primers or topcoats comply with the specified content 
limits, unless the permitting agency specifies a shorter averaging 
period as part of an ambient ozone control program.
    (ii) Averaging primers together with topcoats is prohibited under 
this subsection.
    (iii) Averaging is allowed only for uncontrolled primers or 
topcoats.
    (iv) Each averaging scheme shall be approved in advance by the 
permitting agency and be adopted as part of the facility's title V 
permit.
    (f) Application Equipment. Except as provided in paragraph (f)(3) 
of this section, each owner or operator of a new or existing primer or 
topcoat application operation subject to this subpart in which any of 
the coatings contain organic HAP or VOC shall comply with the 
requirements specified in paragraphs (f)(1) and (f)(2) of this section.
    (1) All primers and topcoats shall be applied using one or more of 
the application techniques specified in paragraphs (f)(1)(i) through 
(f)(1)(viii) of this section.
    (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) High volume low pressure (HVLP) spraying;
    (viii) Electrostatic spray application; or
    (ix) Other coating application methods that achieve emission 
reductions equivalent to HVLP or electrostatic spray application 
methods, as determined according to the requirements in Sec. 63.750(i).
    (2) All application devices used to apply primers or topcoats shall 
be operated according to company procedures, local specified operating 
procedures, and/or the manufacturer's specifications, whichever is most 
stringent, at all times. Equipment modified by the facility shall 
maintain a transfer efficiency equivalent to HVLP and electrostatic 
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 the use of an airbrush or 
an extension on the spray gun to properly reach limited access spaces;
    (ii) The application of coatings that contain fillers that 
adversely affect atomization with HVLP spray guns and that the 
permitting agency has determined cannot be applied by any of the 
application methods specified in paragraph (f)(1) of this section;
    (iii) The application of coatings that normally have a dried film 
thickness of 

[[Page 45963]]
less than 0.0013 centimeter (0.0005 in.) and that the permitting agency 
has determined cannot be applied by any of the application methods 
specified in paragraph (f)(1) of this section;
    (iv) The use of airbrush application methods for stenciling, 
lettering, and other identification markings;
    (v) The use of hand-held spray can application methods; and
    (vi) Touch-up and repair operations.
    (g) Inorganic HAP emissions. Except as provided in paragraph (g)(4) 
of this section, each owner or operator of a new or existing primer or 
topcoat application operation subject to this subpart in which any of 
the coatings that are spray applied contain inorganic HAP, shall comply 
with the applicable requirements in paragraphs (g)(1) through (g)(3) of 
this section.
    (1) Apply these coatings in a booth or hangar in which air flow is 
directed downward onto or across the part or assembly being coated and 
exhausted through one or more outlets.
    (2) Control the air stream from this operation as follows:
    (i) For existing sources, pass the air stream through either a dry 
particulate filter system or a waterwash system before exhausting it to 
the atmosphere.
    (ii) Waterwash booths shall remain in operation during all coating 
application operations.
    (iii) Dry filter booths shall include two-stage filter systems or 
the equivalent, as determined by the permitting agency.
    (iv) For new sources, pass the air stream through either a two-
stage dry particulate filter system or a waterwash system before 
exhausting it to the atmosphere. If the primer or topcoat contains 
chromium or cadmium, control shall consist of either a three-stage 
filter system, HEPA filter system, or other equivalent control system 
as approved by the permitting agency.
    (v) If a dry particulate filter system is used, the following 
requirements shall be met:
    (A) Maintain the system in good working order;
    (B) Install a differential pressure gauge across the filter banks;
    (C) Continuously monitor the pressure drop across the filter; and
    (D) Take corrective action when the pressure drop exceeds or falls 
below the filter manufacturer's recommended limit(s).
    (vi) If a waterwash system is used, continuously monitor the water 
flow rate.
    (3) If the pressure drop across the dry particulate filter system, 
as recorded pursuant to Sec. 63.752(d)(1), is outside the limit(s) 
specified by the filter manufacturer or in locally prepared operating 
procedures, shut down the operation immediately and take corrective 
action. If the water path in the waterwash system fails the visual 
continuity/flow characteristics check, or the water flow rate recorded 
pursuant to Sec. 63.752(d)(2) exceeds the limit(s) specified by the 
booth manufacturer or in locally prepared operating procedures, or the 
booth manufacturer's or locally prepared maintenance procedures for the 
filter or waterwash system have not been performed as scheduled, shut 
down the operation immediately and take corrective action. The 
operation shall not be resumed 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 components;
    (v) Stencil operations performed by brush or air brush;
    (vi) Section joining;
    (vii) Touch-up of bushings and other similar parts;
    (viii) Sealant detackifying; and
    (ix) Painting parts in an area identified in a title V permit, 
where the permitting authority has determined that it is not 
technically feasible to paint the parts in a booth.


Sec. 63.746  Standards: Depainting Operations.

    (a) Applicability. Each owner or operator of a new or existing 
depainting operation subject to this subpart shall comply with the 
requirements in paragraphs (a)(1) through (a)(3) of this section, and 
with the requirements specified in paragraph (b) where there are no 
controls for organic HAP, or paragraph (c) where organic HAP are 
controlled using a control system. This subpart does not apply to an 
aerospace manufacturing facility that depaints 6 or less completed 
aerospace vehicles in a calendar year.
    (1) The provisions of this section apply to the depainting of the 
outer surface areas of completed aerospace vehicles, including the 
fuselage, wings, and vertical and horizontal stabilizers of the 
aircraft, and the outer casing and stabilizers of missiles and rockets. 
These provisions do not apply to the depainting of parts or units 
normally removed from the aerospace vehicle for depainting. However, 
depainting of wings and stabilizers is always subject to the 
requirements 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 intended for public 
display, no longer operational, and not easily capable of being moved 
are exempt from the requirements of this 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 assemblies normally 
removed from the primary aircraft structure before depainting.
    (b)(1) HAP emissions--non-HAP chemical strippers and technologies. 
Except as provided in paragraph (b)(3) of this section, each owner or 
operator of a new or existing aerospace depainting operation subject to 
this subpart shall emit no organic HAP from chemical stripping 
formulations and agents or chemical paint softeners.
    (2) Where non-chemical based equipment is used to comply with 
paragraph (b)(1) of this section, either in total or in part, each 
owner or operator shall operate and maintain the equipment according to 
the manufacturer's specifications or locally prepared operating 
procedures. During periods of malfunctions of such equipment, each 
owner or operator may use substitute materials during the repair period 
provided 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 materials are 
organic HAP-free.
    (3) Each owner or operator of a new or existing depainting 
operation complying with paragraph (b)(1) shall not, on an annual 
average basis, use more than 26 gallons of organic HAP-containing 
chemical strippers per commercial aircraft depainted or more than 50 
gallons of organic HAP-containing chemical strippers per military 
aircraft depainted for spot stripping and decal removal.
    (4) Each owner or operator of a new or existing depainting 
operation complying with paragraph (b)(2), that generates airborne 
inorganic HAP emissions from dry media blasting equipment, shall also 
comply with the requirements specified in paragraphs (b)(4)(i) through 
(b)(4)(v) of this section.
    (i) Perform the depainting operation in an enclosed area.
    (ii) Pass any air stream removed from the enclosed area through a 
dry particulate filter system, baghouse, or waterwash system before 
exhausting it to the atmosphere. 

[[Page 45964]]

    (iii) If a dry particulate filter system is used, the following 
requirements shall be met:
    (A) Maintain the system in good working order;
    (B) Install a differential pressure gauge across the filter banks;
    (C) Continuously monitor the pressure drop across the filter; and
    (D) Take corrective action when the pressure drop exceeds or falls 
below the filter manufacturer's recommended limits.
    (iv) If a waterwash system is used, continuously monitor the water 
flow rate.
    (v) If the pressure drop, as recorded pursuant to 
Sec. 63.752(e)(7), is outside the limit(s) specified by the filter 
manufacturer or in locally prepared operating procedures, whichever is 
more stringent, shut down the operation immediately and take corrective 
action. If the water path in the waterwash system fails the visual 
continuity/flow characteristics check as recorded pursuant to 
Sec. 63.752(e)(7), or the water flow rate, as recorded pursuant to 
Sec. 63.752(d)(2), exceeds the limit(s) specified by the booth 
manufacturer or in locally prepared operating procedures, or the booth 
manufacturer's or locally prepared maintenance procedures for the 
filter or waterwash system have not been performed as scheduled, shut 
down the operation immediately and take corrective action. The 
operation shall not be resumed until the pressure drop or water flow 
rate is returned within the specified limit(s).
    (5) Mechanical and hand sanding operations are exempt from the 
requirements in paragraph (b)(4) of this section.
    (c) Organic HAP emissions--organic HAP-containing chemical 
strippers. Each owner or operator of a new or existing organic HAP-
containing chemical stripper depainting operation subject to this 
subpart shall comply with the requirements specified in this paragraph.
    (1) All organic HAP emissions from the operation shall be reduced 
by the use of a control system. Each control system that was installed 
before the effective date shall reduce the operations' organic HAP 
emissions to the atmosphere by 81% or greater, taking into account 
capture and destruction or removal efficiencies, as determined using 
the procedures in Sec. 63.750(g) when a carbon adsorber is used or 
Sec. 63.750(h) when a control device other than a carbon adsorber is 
used. Each control system installed on or after the effective date 
shall reduce organic HAP emissions to the atmosphere by 95% or greater. 
Reduction shall take into account capture and destruction or removal 
efficiencies, and the volume of chemical stripper used (e.g., the 95% 
efficiency may be achieved by controlling emissions at 81% efficiency 
with a control system and using 74% less stripper than in baseline 
applications). The baseline shall be calculated using data from 1996 
and 1997, which shall be on a usage per aircraft or usage per square 
foot of surface basis.


Sec. 63.747  Standards: Chemical milling maskant application 
operations.

    (a) Each owner or operator of a new or existing chemical milling 
maskant operation subject to this subpart shall comply with the 
requirements specified in paragraph (c) of this section for those 
chemical milling maskants that are uncontrolled (no control device is 
used to reduce organic HAP emissions from the operation) and in 
paragraph (d) of this section for those chemical milling maskants that 
are controlled (organic HAP emissions from the operation are reduced by 
the use of a control device).
    (b) Each owner or operator shall conduct the handling and transfer 
of chemical milling maskants to or from containers, tanks, vats, 
vessels, and piping systems in such a manner that minimizes spills.
    (c) Uncontrolled maskants--organic HAP and VOC content levels. Each 
owner or operator shall comply with the organic HAP and VOC content 
limits specified in paragraphs (c)(1) and (c)(2) of this section for 
each chemical milling maskant that is uncontrolled.
    (1) Organic HAP emissions from chemical milling maskants shall be 
limited to an organic HAP content level of no more than 160 grams of 
organic HAP per liter (1.3 lb/gal) of chemical milling maskant (less 
water) as applied.
    (2) VOC emissions from chemical milling maskants shall be limited 
to a VOC content level of no more than 160 grams of VOC per liter (1.3 
lb/gal) of chemical 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 maskant; 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, taking into account capture and 
destruction or removal efficiencies, as determined using the procedures 
in Sec. 63.750(g) when a carbon adsorber is used and in Sec. 63.750(h) 
when a control device other than a carbon adsorber is used.
    (e) Compliance methods. Compliance with the organic HAP and VOC 
content limits specified in paragraphs (c)(1) and (c)(2) of this 
section may be accomplished by using the methods specified in 
paragraphs (e)(1) and (e)(2) of this section either 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 in paragraphs (c)(1) and 
(c)(2) of this section.
    (2)(i) Use any combination of chemical milling maskants such that 
the monthly volume-weighted average organic HAP and VOC contents of the 
maskants comply with the specified content limits, unless the 
permitting agency specifies a shorter averaging period as part of an 
ambient ozone control program.
    (ii) Averaging is allowed only for uncontrolled chemical milling 
maskants.
    (iii) Each averaging scheme shall be approved in advance by the 
permitting agency and be adopted as part of the facility's title V 
permit.


Sec. 63.748  Standards: Handling and storage of waste.

    Except as provided in Sec. 63.741(e), the owner or operator of each 
facility subject to this subpart that produces a waste that contains 
HAP shall conduct the handling and transfer of the waste to or from 
containers, tanks, vats, vessels, and piping systems in such a manner 
that minimizes spills.


Sec. 63.749  Compliance dates and determinations.
    (a) Compliance dates. Each owner or operator of an existing source 
subject to this subpart shall comply with the requirements of this 
subpart within 3 years after the effective date. Owners or operators of 
new sources subject to this subpart shall comply on the effective date 
or upon startup, whichever is later. In addition, each owner or 
operator shall comply with the compliance dates specified in 
Sec. 63.6(b) and Sec. 63.6(c).
    (b) General. Each facility subject to this subpart shall be 
considered in noncompliance if the owner or operator fails to submit an 
operation and maintenance plan as required by Sec. 63.743(b) or uses a 
control device other than one specified in this subpart that has not 
been approved by the Administrator, as required by Sec. 63.743(c).
    (c) Cleaning operations. Each cleaning operation subject to this 
subpart shall be considered in noncompliance if the 

[[Page 45965]]
owner or operator fails to institute and carry out the housekeeping 
measures required under Sec. 63.744(a). Incidental emissions resulting 
from the activation of pressure release vents and valves on enclosed 
cleaning systems are exempt from this paragraph.
    (1) Hand-wipe cleaning. An affected hand-wipe cleaning operation 
shall be considered in compliance when all hand-wipe cleaning solvents, 
excluding those used for hand cleaning of spray gun equipment under 
Sec. 63.744(c)(3), meet either the composition requirements specified 
in Sec. 63.744(b)(1) or the vapor pressure requirement specified in 
Sec. 63.744(b)(2).
    (2) Spray gun cleaning. An affected spray gun cleaning operation 
shall be considered in compliance when each of the following conditions 
is met:
    (i) One of the four techniques specified in Sec. 63.744 (c)(1) 
through (c)(4) is used;
    (ii) The technique selected is operated according to the procedures 
specified in Sec. 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 by the 15th day after detection, 
the solvent shall be removed and the enclosed cleaner shall be shut 
down until the cleaner is repaired or its use is permanently 
discontinued.
    (3) Flush cleaning. An affected flush cleaning operation shall be 
considered in compliance if the operating requirements specified in 
Sec. 63.744(d) are implemented and carried out.
    (d) Organic HAP and VOC content levels--primer and topcoat 
application operations.
    (1) Performance test periods. For uncontrolled coatings that are 
not averaged, each 24 hours is considered a performance test. For 
compliant 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 constitute the test period for the initial 
and any subsequent performance test. When using a carbon adsorber, each 
rolling material balance period is considered a performance test.
    (2) Initial performance tests. If a control device is used, each 
owner or operator shall conduct an initial performance test to 
demonstrate compliance with the overall reduction efficiency specified 
in paragraph Sec. 63.745, unless a waiver is obtained under either 
Sec. 63.7(e)(2)(iv) or Sec. 63.7(h). The initial performance test shall 
be conducted according to the procedures and test methods specified in 
Sec. 63.7 and Sec. 63.750(g) for carbon adsorbers and in Sec. 63.750(h) 
for control devices other than carbon adsorbers. For carbon adsorbers, 
the initial performance test shall be used to establish the appropriate 
rolling material balance period for determining compliance. The 
procedures in paragraphs (d)(2)(i) through (d)(2)(vi) of this section 
shall be used in determining initial compliance with the provisions 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 fixed-bed carbon adsorption 
system with a common exhaust stack for all the individual carbon 
adsorber vessels pursuant to Sec. 63.750(g) (2) or (4), the test shall 
consist of three separate runs, each coinciding with one or more 
complete sequences through the adsorption cycles of all of the 
individual carbon adsorber vessels.
    (B) When either EPA Method 18 or EPA Method 25A is to be used in 
the determination of the efficiency of a fixed-bed carbon adsorption 
system with individual exhaust stacks for each carbon adsorber vessel 
pursuant to Sec. 63.750(g) (3) or (4), each carbon adsorber vessel 
shall be tested individually. The test for each carbon adsorber vessel 
shall consist of three separate runs. Each run shall coincide with one 
or more complete 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 for stack gas 
moisture.
    (vi) EPA Methods 2, 2A, 2C, 2D, 3, and 4 shall be performed, as 
applicable, at least twice during each test period.
    (3) The primer application operation is considered in compliance 
when the conditions specified in paragraphs (d)(3)(i) through 
(d)(3)(iv) of this section, as applicable, and in paragraph (e) of this 
section are met. Failure to meet any one of the conditions identified 
in these paragraphs shall constitute noncompliance.
    (i) For all uncontrolled primers, all values of Hi and Ha 
(as determined using the procedures specified in Sec. 63.750 (c) and 
(d)) are less than or equal to 350 grams of organic HAP per liter (2.9 
lb/gal) of primer (less water) as applied, and all values of Gi 
and Ga (as determined using the procedures specified in 
Sec. 63.750 (e) and (f)) are less than or equal to 350 grams of organic 
VOC per liter (2.9 lb/gal) of primer (less water and exempt solvents) 
as applied.
    (ii) If a control device is used:
    (A) The overall control system efficiency, Ek, as determined 
using the procedures specified in Sec. 63.750(g) for control systems 
containing carbon adsorbers and in Sec. 63.750(h) for control systems 
with other control devices, is equal to or greater than 81% during the 
initial performance test and any subsequent performance test;
    (B) If an incinerator other than a catalytic incinerator is used, 
the average combustion temperature for all 3-hour periods is greater 
than or equal to the average combustion temperature established under 
Sec. 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 established under Sec. 63.751(b)(12).
    (iii)(A) Uses an application technique specified in Sec. 63.745 
(f)(1)(i) through (f)(1)(viii), or
    (B) Uses an alternative application technique, as allowed under 
Sec. 63.745(f)(1)(ix), such that the emissions of both organic HAP and 
VOC for the implementation period of the alternative application method 
are less than or equal to the emissions generated during the initial 
30-day period, the period of time required to apply primer to five 
completely assembled aircraft, or a time period approved by the 
permitting agency, using HVLP or electrostatic spray application 
methods as determined using the procedures specified in Sec. 63.750(i).
    (iv) Operates all application techniques in accordance with the 
manufacturer's specifications or locally prepared operating procedures, 
whichever is more stringent.
    (4) The topcoat application operation is considered in compliance 
when the conditions specified in paragraphs (e)(4)(i) through 
(e)(4)(iv) of this section, as applicable, and in paragraph (f) of this 
section are met. Failure to meet any of the conditions identified in 
these paragraphs shall constitute noncompliance.
    (i) For all uncontrolled topcoats, all values of Hi and 
Ha(as determined using the procedures specified in Sec. 63.750(c) 
and (d)) are less than or equal to 420 grams organic HAP per liter (3.5 
lb/gal) of topcoat (less water) as applied, and all values of Gi 
and Ga (as determined using the procedures specified in 

[[Page 45966]]
Sec. 63.750(e) and (f)) are less than or equal to 420 grams organic VOC 
per liter (3.5 lb/gal) of topcoat (less water and exempt solvents) as 
applied.
    (ii) If a control device is used,
    (A) The overall control system efficiency, Ek, as determined 
using the procedures specified in Sec. 63.750(g) for control systems 
containing carbon adsorbers and in Sec. 63.750(h) for control systems 
with other control devices, is equal to or greater than 81% during the 
initial performance test and any subsequent performance test;
    (B) If an incinerator other than a catalytic incinerator is used, 
the average combustion temperature for all 3-hour periods is greater 
than or equal to the average combustion temperature established under 
Sec. 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 established under Sec. 63.751(b)(12).
    (iii)(A) Uses an application technique specified in 
Sec. 63.745(f)(1)(i) through (f)(1)(ix) or
    (B) Uses an alternative application technique as allowed under 
Sec. 63.745(f)(1)(ix) such that the emissions of both organic HAP and 
VOC for the implementation period of the alternative application method 
are less than or equal to the emissions generated during the initial 
30-day period, the period of time required to apply topcoat to five 
completely assembled aircraft, or a time period approved by the 
permitting agency, using HVLP or electrostatic spray application 
methods as determined using the procedures specified in Sec. 63.750(i).
    (iv) Operates all application techniques in accordance with the 
manufacturer's specifications or locally prepared operating procedures.
    (e) Inorganic HAP emissions--primer and topcoat application 
operations. For each primer or topcoat application operation that emits 
inorganic HAP, the operation is in compliance when:
    (1) It is operated according to the requirements specified in 
Sec. 63.745(g)(1) through (g)(3); and
    (2) It is shut down immediately whenever the pressure drop or water 
flow rate is outside the limit(s) established for them and is not 
restarted until the pressure drop or water flow rate is returned within 
these limit(s), as required under Sec. 63.745(g)(3).
    (f) Organic HAP emissions--Depainting operations.
    (1) Performance test periods. When using a control device 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 balance period is considered a 
performance test. Each 24-hour period is considered a performance test 
period for determining compliance with Sec. 63.746(b)(1). For 
uncontrolled organic emissions from depainting operations, each 
calendar year is considered a performance test period for determining 
compliance with the HAP limits for organic HAP-containing chemical 
strippers used for spot stripping and decal removal.
    (2) Initial performance tests. If a control device is used, each 
owner or operator shall conduct an initial performance test to 
demonstrate compliance with the overall reduction efficiency specified 
in Sec. 63.746(c), unless a waiver is obtained under either 
Sec. 63.7(e)(2)(iv) or Sec. 63.7(h). The initial performance test shall 
be conducted according to the procedures and test methods specified in 
Sec. 63.7 and Sec. 63.750(g) for carbon adsorbers and in Sec. 63.750(h) 
for control devices other than carbon adsorbers. For carbon adsorbers, 
the initial performance test shall be used to establish the appropriate 
rolling material balance period for determining compliance. The 
procedures in paragraphs (2)(i) through (2)(vi) of this section shall 
be used in determining initial compliance with the provisions 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 fixed-bed carbon adsorption 
system with a common exhaust stack for all the individual carbon 
adsorber vessels pursuant to Sec. 63.750(g)(2) or (4), the test shall 
consist of three separate runs, each coinciding with one or more 
complete sequences through the adsorption cycles of all of the 
individual carbon adsorber vessels.
    (B) When either EPA Method 18 or EPA Method 25A is to be used in 
the determination of the efficiency of a fixed-bed carbon adsorption 
system with individual exhaust stacks for each carbon adsorber vessel 
pursuant to Sec. 63.750(g) (3) or (4), each carbon adsorber vessel 
shall be tested individually. The test for each carbon adsorber vessel 
shall consist of three separate runs. Each run shall coincide with one 
or more complete 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 for stack gas 
moisture.
    (vi) EPA Methods 2, 2A, 2C, 2D, 3, and 4 shall be performed, as 
applicable, at least twice during each test period.
    (3) An organic HAP-containing chemical stripper depainting 
operation is considered in compliance when the conditions specified in 
paragraph (g)(3)(i) of this section are met.
    (i) 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 Sec. 63.750(g) (or other control device as 
determined using the procedures specified in Sec. 63.750(h)), is equal 
to or greater than 81% for control systems installed before the 
effective date, or equal to or greater than 95% for control systems 
installed on 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 with 
Sec. 63.746(b)(1);
    (A) For any spot stripping and decal removal, the value of C, as 
determined using the procedures specified in Sec. 63.750(j), is less 
than or equal to 26 gallons of organic HAP-containing chemical stripper 
per aircraft depainted for commercial aircraft and is less than or 
equal to 50 gallons of organic HAP-containing chemical stripper per 
aircraft depainted for military aircraft calculated on a yearly 
average; and
    (B) The requirements of Sec. 63.746(b)(2) are carried out 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 Sec. 63.746(b)(4) are 
followed; and
    (2) It is shut down immediately whenever the pressure drop or water 
flow rate is outside the limit(s) established for them and is not 
restarted until the pressure drop or water flow rate is returned within 
these limit(s), as required under Sec. 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 noncompliant chemical milling maskants that are 
averaged together, each 30-day period is considered a performance test, 
unless the permitting agency specifies a shorter period as part of an 
ambient ozone 

[[Page 45967]]
control program. When using a control device 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 balance period is considered a performance test.
    (2) Initial performance tests. If a control device is used, each 
owner or operator shall conduct an initial performance test to 
demonstrate compliance with the overall reduction efficiency specified 
in Sec. 63.747(d), unless a waiver is obtained under either 
Sec. 63.7(e)(2)(iv) or Sec. 63.7(h). The initial performance test shall 
be conducted according to the procedures and test methods specified in 
Sec. 63.7 and Sec. 63.750(g) for carbon adsorbers and in Sec. 63.750(h) 
for control devices other than carbon adsorbers. For carbon adsorbers, 
the initial performance test shall be used to establish the appropriate 
rolling material balance period for determining compliance. The 
procedures in paragraphs (h)(2) (i) through (vi) of this section shall 
be used in determining initial compliance with the provisions 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 fixed-bed carbon adsorption 
system with a common exhaust stack for all the individual carbon 
adsorber vessels pursuant to Sec. 63.750(g) (2) or (4), the test shall 
consist of three separate runs, each coinciding with one or more 
complete sequences through the adsorption cycles of all of the 
individual carbon adsorber vessels.
    (B) When either EPA Method 18 or EPA Method 25A is to be used in 
the determination of the efficiency of a fixed-bed carbon adsorption 
system with individual exhaust stacks for each carbon adsorber vessel 
pursuant to Sec. 63.750(g) (3) or (4), each carbon adsorber vessel 
shall be tested individually. The test for each carbon adsorber vessel 
shall consist of three separate runs. Each run shall coincide with one 
or more complete 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 for stack gas 
moisture.
    (vi) EPA Methods 2, 2A, 2C, 2D, 3, and 4 shall be performed, as 
applicable, at least twice during each test period.
    (3) The chemical milling maskant application operation is 
considered in compliance when the conditions specified in paragraphs 
(i)(3)(i) and (i)(3)(ii) of this section are met.
    (i) For all uncontrolled chemical milling maskants, all values of 
Hi and Ha (as determined using the procedures specified in 
Sec. 63.750 (k) and (l)) are less than or equal to 160 grams of organic 
HAP per liter (1.3 lb/gal) as applied (less water) and all values of 
Gi and Ga (as determined using the procedures specified in 
Sec. 63.750 (m) and (n)) are less than or equal to 160 grams of VOC per 
liter (1.3 lb/gal) of 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 Sec. 63.750(g) (or systems with other 
control devices as determined using the procedures specified in 
Sec. 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 requirements specified in 
Sec. 63.748 shall be considered a violation.


Sec. 63.750  Test methods and procedures.

    (a) Composition determination. Compliance with the hand-wipe 
cleaning solvent approved composition list specified in 
Sec. 63.744(b)(1) for hand-wipe cleaning solvents shall be demonstrated 
using data supplied by the manufacturer of the cleaning solvent. The 
data shall identify all components of the cleaning solvent and shall 
demonstrate that one of the approved composition definitions is met.
    (b) Vapor pressure determination. The composite vapor pressure of 
hand-wipe cleaning solvents used in a cleaning operation subject to 
this subpart shall be determined as follows:
    (1) For single-component hand-wipe cleaning solvents, the vapor 
pressure shall be determined using MSDS or other 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 amount of each organic compound 
in the blend using manufacturer's supplied data or a gas 
chromatographic analysis in accordance with ASTM E 260-91 (incorporated 
by reference as specified in Sec. 63.14 of subpart A of this part) and 
by calculating the composite vapor pressure of the solvent by summing 
the partial pressures of each component. The vapor pressure of each 
component shall be determined using manufacturer's data, standard 
engineering reference texts, or other equivalent methods. The following 
equation shall be used to determine the composite vapor pressure:
[GRAPHIC][TIFF OMITTED]TR01SE95.003

where:

Wi=Weight of the ``i''th VOC compound, grams.
Ww=Weight of water, grams.
We=Weight of non-HAP, nonVOC compound, grams.
MWi=Molecular weight of the ``i''th VOC compound, g/g-mole.
MWw=Molecular weight of water, g/g-mole.
MWe=Molecular weight of exempt compound, g/g-mole.
PPc=VOC composite partial pressure at 20  deg.C, mm Hg.
VPi=Vapor pressure of the ``i''th VOC compound at 20  deg.C, mm 
Hg.
    (c) Organic HAP content level determination--compliant primers and 
topcoats. For those uncontrolled primers and topcoats complying with 
the primer and topcoat organic HAP content limits specified in 
Sec. 63.745(c) without being averaged, the following procedures shall 
be used to determine the mass of organic HAP emitted per volume of 
coating (less water) as applied.
    (1) For coatings that contain no exempt solvents, determine the 
total organic HAP content using manufacturer's supplied data or Method 
24 of 40 CFR part 60, appendix A to determine the VOC content. The VOC 
content shall be used as a surrogate for total HAP content for coatings 
that contain no exempt solvent. If there is a discrepancy between the 
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 content, then the analytical VOC content 
should be set equal to the formulation solvent content.
    (2) For each coating formulation as applied, determine the organic 
HAP weight fraction, water weight fraction (if 

[[Page 45968]]
applicable), and density from manufacturer's data. If these values 
cannot be determined using the manufacturer's data, the owner or 
operator shall submit an alternative procedure for determining their 
values for approval by the Administrator. Recalculation is required 
only when a change occurs in the coating formulation.
    (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:
[GRAPHIC][TIFF OMITTED]TR01SE95.004

where

Vwi=volume (gal) of water in one gal of coating i.
Dci=density (lb of coating per gal of coating) of coating i.
Wwi=weight fraction (expressed as a decimal) of water in coating 
i.
Dw=density of water, 8.33 lb/gal.
[GRAPHIC][TIFF OMITTED]TR01SE95.005

where

MHi=mass (lb) of organic HAP in one gal of coating i.
Dci=density (lb of coating per gal of coating) of coating i.
WHi=weight fraction (expressed as a decimal) of organic HAP in 
coating i.
[GRAPHIC][TIFF OMITTED]TR01SE95.006

where

Hi=mass of organic HAP emitted per volume of coating i (lb/gal) 
less water as applied.
MHi=mass (lb) of organic HAP in one gal of coating i.
Vwi=volume (gal) of water in one gal of coating i.
    (d) Organic HAP content level determination--averaged primers and 
topcoats. For those uncontrolled primers and topcoats that are averaged 
together in order to comply with the primer and topcoat organic HAP 
content limits specified in Sec. 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, 
unless the permitting agency specifies a shorter averaging period as 
part of an ambient ozone control program.
    (1)(i) Determine the total organic HAP weight fraction as applied 
of each coating. If any ingredients, including diluent solvent, are 
added to a coating prior to its application, the organic HAP weight 
fraction of the coating shall be determined at a time and location in 
the process after all ingredients have been added.
    (ii) Determine the total organic HAP weight fraction of each 
coating as applied each month.
    (A) If no changes have been made to a coating, either as supplied 
or as applied, or if a change has been made that has a minimal effect 
on the organic HAP content of the coating, the value previously 
determined may continue to be used until a change in formulation has 
been made by either the manufacturer or the user.
    (B) If a change in formulation or a change in the ingredients added 
to the coating takes place, including the ratio of coating to diluent 
solvent, prior to its application, either of which results in a more 
than minimal effect on the organic HAP content of the coating, the 
total organic HAP weight fraction of the coating shall be redetermined.
    (iii) Manufacturer's formulation data may be used to determine the 
total organic HAP content of each coating and any ingredients added to 
the coating prior to its application. If the total organic HAP content 
cannot be determined using the manufacturer's data, the owner or 
operator shall submit an alternative procedure for determining the 
total organic HAP weight fraction for approval by the Administrator.
    (2)(i) Determine the volume both in total gallons as applied and in 
total gallons (less water) as applied of each coating. If any 
ingredients, including diluent solvents, are added prior to its 
application, the volume of each coating shall be determined at a time 
and location in the process after all ingredients (including any 
diluent solvent) have been added.
    (ii) Determine the volume of each coating (less water) as applied 
each month, unless the permitting agency specifies a shorter period as 
part of an ambient ozone control program.
    (iii) The volume applied may be determined from company records.
    (3)(i) Determine the density of each coating as applied. If any 
ingredients, including diluent solvent, are added to a coating prior to 
its application, the density of the coating shall be determined at a 
time and location in the process after all ingredients have been added.
    (ii) Determine the density of each coating as applied each month, 
unless the permitting agency specifies a shorter period as part of an 
ambient ozone control program.
    (A) If no changes have been made to a coating, either as supplied 
or as applied, or if a change has been made 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 manufacturer or the user.
    (B) If a change in formulation or a change in the ingredients added 
to the coating takes place, including the ratio of coating to diluent 
solvent, prior to its application, either of which results in a more 
than minimal effect on the density of the coating, then the density of 
the coating shall be redetermined.
    (iii) The density may be determined from company records, including 
manufacturer's data sheets. If the density of the coating cannot be 
determined using the company's records, including the manufacturer's 
data, then the owner or operator shall submit an alternative procedure 
for determining the density for approval by the Administrator.
    (4) Calculate the total volume in gallons as applied (less water) 
by summing the individual volumes of each coating (less water) as 
applied, which were determined under paragraph (d)(2) of this section.
    (5) Calculate the volume-weighted average mass of organic HAP in 
coatings emitted per unit volume (lb/gal) of coating (less water) as 
applied during each 30-day period using equation 4:
[GRAPHIC][TIFF OMITTED]TR01SE95.007

where

Ha=volume-weighted average mass of organic HAP emitted 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.
WHi=weight fraction (expressed as a decimal) of organic HAP in 
coating i as applied that is being averaged during each 30-day period.
Dci=density (lb of coating per gal of coating) of coating i as 
applied that is being averaged during each 30-day period.
Vci=volume (gal) of coating i as applied that is being averaged 
during the 30-day period.
Clw=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 primers and 
topcoats. For those uncontrolled primers and topcoats 

[[Page 45969]]
complying with the primer and topcoat VOC content levels specified in 
Sec. 63.745(c) without being averaged, the following procedure shall be 
used to determine the mass of VOC emitted per volume of coating (less 
water and exempt solvents) as applied.
    (1) Determine the VOC content of each formulation (less water and 
exempt solvents) as applied using manufacturer's supplied data or 
Method 24 of 40 CFR part 60, appendix A to determine the VOC content. 
The VOC content shall be used as a surrogate for total HAP content for 
coatings that contain no exempt solvent. If there is a discrepancy 
between the 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 content, then the analytical VOC content 
should be set equal to the 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:
[GRAPHIC][TIFF OMITTED]TR01SE95.008

where

Vwi=volume (gal) of water in one gal of coating i.
Dci=density (lb of coating per gal of coating) of coating i.
Wwi=weight fraction (expressed as a decimal) of water in coating 
i.
Dw=density of water, 8.33 lb/gal.
[GRAPHIC][TIFF OMITTED]TR01SE95.009

where

MVi=mass (lb) of VOC in one gal of coating i.
Dci=density (lb of coating per gal of coating) of coating i.
WVi=weight fraction (expressed as a decimal) of VOC in coating i.
[GRAPHIC][TIFF OMITTED]TR01SE95.010

where

Gi=mass of VOC emitted per volume of coating i (lb/gal) (less 
water and exempt solvents) as applied.
MVi=mass (lb) of VOC in one gal of coating i.
Vwi=volume (gal) of water in one gal of coating i.
VXi=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 Ga, compliance shall be based, except 
as provided in paragraph (e)(3)(ii) of this section, upon the VOC 
content obtained using EPA Method 24.
    (ii) If the VOC content of a coating obtained using Method 24 would 
indicate noncompliance as determined under either Sec. 63.749 (d)(3)(i) 
or (d)(4)(i), an owner or operator may elect to average the coating 
with other uncontrolled coatings and (re)calculate Gi (using the 
procedure specified in paragraph (f) of this section), provided 
appropriate and sufficient records were maintained for all coatings 
included in the average (re)calculation. The (re)calculated value of 
Gi (Ga in paragraph (f)) for the averaged coatings shall then 
be used to determine compliance.
    (f) VOC content level determination--averaged primers and topcoats. 
For those uncontrolled primers and topcoats that are averaged within 
their respective coating category in order to comply with the primer 
and topcoat VOC content limits specified in Sec. 63.745 (c)(2) and 
(c)(4), the following procedure shall be used to determine the monthly 
volume-weighted average mass of VOC emitted per volume of coating (less 
water and exempt solvents) as applied, unless the permitting agency 
specifies a shorter averaging period as part of an ambient ozone 
control program.
    (1)(i) Determine the VOC content (lb/gal) as applied of each 
coating. If any ingredients, including diluent solvent, are added to a 
coating prior to its application, the VOC content of the coating shall 
be determined at a time and location in the process after all 
ingredients have been added.
    (ii) Determine the VOC content of each coating as applied each 
month, unless the permitting agency specifies a shorter period as part 
of an ambient ozone control program.
    (A) If no changes have been made to a coating, either as supplied 
or as applied, or if a change has been made that has a minimal effect 
on the VOC content of the coating, the value previously determined may 
continue to be used until a change in formulation has been made by 
either the manufacturer or the user.
    (B) If a change in formulation or a change in the ingredients added 
to the coating takes place, including the ratio of coating to diluent 
solvent, prior to its application, either of which results in a more 
than minimal effect on the VOC content of the coating, the VOC content 
of the coating shall be redetermined.
    (iii) Determine the VOC content of each primer and topcoat 
formulation (less water and exempt solvents) as applied using EPA 
Method 24 or from manufacturer's data.
    (2)(i) Determine the volume both in total gallons as applied and in 
total gallons (less water and exempt solvents) as applied of each 
coating. If any ingredients, including diluent solvents, are added 
prior to its application, the volume of each coating shall be 
determined at a time and location in the process after all ingredients 
(including any diluent solvent) have been added.
    (ii) Determine the volume of each coating (less water and exempt 
solvents) as applied each day.
    (iii) The volume applied may be determined from company records.
    (3) Calculate the total volume in gallons (less water and exempt 
solvents) as applied by summing the individual volumes of each coating 
(less water and exempt solvents) as applied, which were determined 
under paragraph (f)(2) of this section.
    (4) Calculate the volume-weighted average mass of VOC emitted per 
unit volume (lb/gal) of coating (less water and exempt solvents) as 
applied for each coating category during each 30-day period using 
equation 8:
[GRAPHIC][TIFF OMITTED]TR01SE95.011

where

Ga=volume weighted average mass of VOC per unit volume 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 and 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.
Vci=volume (gal) of coating i (less water and exempt solvents) as 
applied that is being averaged during the 30-day period.
Clwes=total volume (gal) of all coatings (less water and 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 

[[Page 45970]]
in calculating Ga, recalculation of Ga is required using the 
new value. If more than one coating is involved, the recalculation 
shall be made once using all of the new values.
    (ii) If recalculation is required, an owner or operator may elect 
to include in the recalculation of Ga uncontrolled coatings that 
were not previously included provided appropriate and sufficient 
records were maintained for these other coatings to allow daily 
recalculations.
    (iii) The recalculated value of Ga under either paragraph 
(f)(5)(i) or (f)(5)(ii) of this section shall be used to determine 
compliance.
    (g) Overall VOC and/or organic HAP control efficiency--carbon 
adsorber. Each owner or operator subject to the requirements of 
Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d) shall demonstrate 
initial compliance with the requirements 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 demonstration is required by this subpart, the procedures in 
paragraphs (g)(9) through (g)(14) of this section shall be used in 
determining initial compliance with the provisions of this subpart.
    (1) To demonstrate initial and continuous compliance with 
Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d) when emissions are 
controlled by a dedicated solvent recovery device, each owner or 
operator of the affected operation may perform a liquid-liquid HAP or 
VOC material balance over rolling 7- to 30-day periods in lieu of 
demonstrating compliance through the methods in paragraph (g)(2), 
(g)(3), or (g)(4) of this section. Results of the material balance 
calculations performed to demonstrate initial compliance shall be 
submitted to the Administrator with the notification of compliance 
status required by Sec. 63.9(h) and by Sec. 63.753 (c)(1)(iv), 
(d)(3)(i), and (e)(3). When demonstrating compliance by this procedure, 
Sec. 63.7(e)(3) of subpart 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 
reduction (R) is calculated using equation 9:
[GRAPHIC][TIFF OMITTED]TR01SE95.012

    (i) The value of RSi is zero unless the owner or operator 
submits the following information to the Administrator for approval of 
a measured RSi value that is greater than zero:
    (A) Measurement techniques; and
    (B) Documentation that the measured value of RSi exceeds zero.
    (ii) The measurement techniques of paragraph (g)(1)(i)(A) of this 
section shall be submitted to the Administrator for approval with the 
notification of performance test required under Sec. 63.7(b).
    (iii) Each owner or operator demonstrating compliance by the test 
method described in paragraph (g)(1) of this section shall:
    (A) Measure the amount of coating or stripper as applied;
    (B) Determine the VOC or HAP content of all coating and stripper 
applied using the test method specified in Sec. 63.750(c) (1) through 
(3) or (e) (1) and (2) of this section;
    (C) Install, calibrate, maintain, and operate, according to the 
manufacturer's specifications, a device that indicates the amount of 
HAP or VOC recovered by the solvent recovery device over rolling 7- to 
30-day periods; the device shall be certified by the manufacturer to be 
accurate to within 2.0 percent, 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 reduction (R) for 
rolling 7- to 30-day periods using equation 9.
    (F) Compliance is demonstrated if the value of R is equal to or 
greater than the overall HAP control efficiencies required by 
Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d).
    (2) To demonstrate initial compliance with Sec. 63.745(d), 
Sec. 63.746(c), or Sec. 63.747(d) when affected HAP emission points are 
controlled by an emission control device other than a fixed-bed carbon 
adsorption system with individual exhaust stacks for each carbon 
adsorber vessel, each owner or operator of an affected source shall 
perform a gaseous emission test using the following procedures.
    (i) Construct the overall HAP emission reduction system 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 
Sec. 63.750(g) (9) through (14).
    (ii) Determine capture efficiency from the HAP emission 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 located in an area with other gaseous 
emission sources not affected by this subpart shall isolate the 
affected HAP emission points from all other gaseous emission points by 
one of the following methods:
    (A) Build a temporary total enclosure around the affected HAP 
emission point(s); or
    (B) Shut down all gaseous emission points not affected by this 
subpart and continue to exhaust fugitive emissions from the affected 
HAP emission points through any building ventilation system and other 
room exhausts such as drying ovens. All ventilation air must be vented 
through stacks suitable 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 device using 
equation 10:
    (v) Determine the efficiency (F) of the capture system using 
equation 11:
[GRAPHIC][TIFF OMITTED]TR01SE95.013

    (vi) For each HAP emission point subject to Sec. 63.745(d), 
Sec. 63.746(c), or Sec. 63.747(d), compliance is demonstrated if the 
product of (E)  x  (F) is equal to or greater than the overall HAP 
control efficiencies required under Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d).
    (3) To demonstrate compliance with Sec. 63.745(d), Sec. 63.746(c), 
or Sec. 63.747(d) when affected HAP emission points are controlled by a 
fixed-bed carbon adsorption system with individual exhaust stacks for 
each carbon adsorber vessel, each owner or operator of an affected 
source shall perform a gaseous emission test using the following 
procedures:
    (i) Construct the overall HAP emission reduction system so that 
each volumetric flow rate and the total HAP emissions can be accurately 
determined by the applicable test methods and procedures specified in 
Sec. 63.750(g) (9) through (14);
    (ii) Assure that all HAP emissions from the affected HAP emission 
point(s) are segregated from gaseous emission points not affected by 
this subpart and that the emissions can be captured for measurement, as 
described in Sec. 63.705(g)(2)(ii) (A) and (B); 

[[Page 45971]]

    (iii) Operate the emission control device with all affected HAP 
emission points connected and operating;
    (iv) Determine the efficiency (Hv) of each individual carbon 
adsorber vessel (v) using equation 12:
[GRAPHIC][TIFF OMITTED]TR01SE95.014

    (v) Determine the efficiency of the carbon adsorption system 
(Hsys) by computing the average efficiency of the individual 
carbon adsorber vessels as weighted by the volumetric flow rate 
(Qhv) of each individual carbon adsorber vessel (v) using equation 
13:
[GRAPHIC][TIFF OMITTED]TR01SE95.015

    (vi) Determine the efficiency (F) of the capture system using 
equation 11.
    (vii) For each HAP emission point subject to Sec. 63.745(d), 
Sec. 63.746(c), or Sec. 63.747(d), compliance is demonstrated if the 
product of (Hsys)  x  (F) is equal to or greater than the overall 
HAP control efficiency required by Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d).
    (4) An alternative method of demonstrating compliance with 
Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d) is the installation 
of a total enclosure around the affected HAP emission point(s) and the 
ventilation of all HAP emissions from the total enclosure to a control 
device with the efficiency specified in paragraph (g)(4)(iii) of this 
section. If this method is selected, the compliance test methods 
described in paragraphs (g)(1), (g)(2), and (g)(3) of this section are 
not required. Instead, 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 total enclosure. The owner or 
operator of an enclosure that does not meet these requirements may 
apply to the Administrator for approval of the enclosure as a total 
enclosure on a case-by-case basis. The enclosure shall be considered a 
total enclosure if it is demonstrated to the satisfaction of the 
Administrator that all HAP emissions from the affected HAP emission 
point(s) are contained and vented to the control device. The 
requirements for automatic approval are as follows:
    (A) The total area of all natural draft openings shall not exceed 
5% of the total surface area of the total enclosure's walls, floor, and 
ceiling;
    (B) All sources of emissions within the enclosure shall be a 
minimum of four equivalent diameters away from each natural draft 
opening;
    (C) The average inward face velocity (FV) across all 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 each can be accurately 
determined by the test methods and procedures specified in 
Sec. 63.750(g) (10) and (11); volumetric flow rates shall be calculated 
without the adjustment normally made for moisture content; and
    (2) Determine FV by equation 14:
    [GRAPHIC][TIFF OMITTED]TR01SE95.016
    
    (D) The air passing through all natural draft openings shall flow 
into the enclosure continuously. If FV is less than or equal to 9,000 
meters per hour, the continuous inward flow of air shall be verified by 
continuous observation using smoke tubes, streamers, tracer gases, or 
other means approved by the Administrator over the period that the 
volumetric flow rate tests required to determine FV are carried out. If 
FV is greater than 9,000 meters per hour, the direction of airflow 
through the natural draft openings shall be presumed to be inward at 
all times without verification.
    (ii) Determine the control device efficiency using equation 10 or 
equations 12 and 13, as applicable, and the test methods and procedures 
specified in Sec. 63.750(g) (9) through (14).
    (iii) Compliance shall be achieved if the installation of a total 
enclosure is demonstrated and the value of E determined from equation 
10 (or the value of Hsys determined from equations 12 and 13, as 
applicable) is equal to or greater than the overall HAP control 
efficiencies required under Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d).
    (5) When nonregenerative carbon adsorbers are used to comply with 
Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d), the owner or 
operator may conduct a design evaluation to demonstrate initial 
compliance in lieu of following the compliance test procedures of 
paragraphs (g)(1), (2), (3), and (4) of this section. The design 
evaluation shall consider the vent stream composition, component 
concentrations, flow rate, relative humidity, and temperature, and 
shall establish the design exhaust vent stream organic compound 
concentration level, capacity of the 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 Sec. 63.745(d), 
Sec. 63.746(c), or Sec. 63.747(d) when hard piping or ductwork is used 
to direct VOC and HAP emissions from a VOC and HAP source to the 
control device, each owner or operator shall demonstrate upon 
inspection that the criteria of paragraph (g)(6)(i)(A) and paragraph 
(g)(6)(i) (B) or (C) of this section VR/FD are met.
    (A) The equipment shall be vented to a control device.
    (B) The control device efficiency (E or Hsys, as applicable) 
determined using equation 10 or equations 12 and 13, respectively, and 
the test methods and procedures specified in Sec. 63.750(g) (9) through 
(14), shall be equal to or greater than the overall HAP control 
efficiency required by Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d).
    (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 Sec. 63.750(g) (1), (2), (3), (4), or (5), to meet the 
requirements of Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d).
    (7) Startups and shutdowns are normal operation for this source 
category. Emissions from these activities are to be included when 
determining if the standards specified in Sec. 63.745(d), 
Sec. 63.746(c), or Sec. 63.747(d) are being attained.
    (8) An owner or operator who uses compliance techniques other than 
those specified in this subpart shall submit a description of those 
compliance procedures, subject to the Administrator's approval, in 
accordance with Sec. 63.7(f) of subpart A.
    (9) Either EPA Method 18 or EPA Method 25A of appendix A of part 
60, as appropriate to the conditions at the site, shall be used to 
determine VOC and HAP concentration of air exhaust streams as required 
by Sec. 63.750(g) (1) through (6). The owner or operator shall submit 
notice of the intended test method to the Administrator for approval 
along with the notification of the performance test required under 
Sec. 63.7(b). Method selection shall be based on consideration of the 
diversity of organic species present and their total 

[[Page 45972]]
concentration and on consideration of 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 fixed-bed carbon adsorption 
system with a common exhaust stack for all the individual carbon 
adsorber vessels pursuant to Sec. 63.750(g) (2) or (3), the test shall 
consist of three separate runs, each coinciding with one or more 
complete sequences through the adsorption cycles of all of the 
individual 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 fixed-bed carbon adsorption 
system with individual exhaust stacks for each carbon adsorber vessel 
pursuant to Sec. 63.750(g) (3) or (4), each carbon adsorber vessel 
shall be tested individually. The test for each carbon adsorber vessel 
shall consist of three separate runs. Each run shall coincide with one 
or more complete 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 part 60 is used 
for velocity and volumetric flow rates.
    (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 each test period.
    (h) Overall VOC and/or organic HAP control efficiency--control 
devices other than carbon adsorbers. Calculate the overall control 
efficiency of a control system with a control device other than a 
carbon adsorber using the following procedure.
    (1) Calculate the overall control efficiency using equation 15:
    [GRAPHIC][TIFF OMITTED]TR01SE95.017
    
where

Ek=overall VOC and/or organic HAP control efficiency (expressed as 
a decimal) of control system k.
Rk=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.
Fk=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 efficiency Rk of a 
control device other than a carbon adsorber shall be determined using 
the procedures described below. The destruction efficiency may be 
measured as either total organic HAP or as TOC minus methane and ethane 
according to these procedures.
    (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 Method 2, 2A, 2C, 
or 2D of 40 CFR part 60, appendix A, as appropriate.
    (iii) Use Method 18 of 40 CFR part 60, appendix A, to measure 
either TOC minus methane and ethane or total organic HAP. 
Alternatively, any other method or data that have 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 shall consist of 
three runs. The minimum sampling time for each run shall be 1 hour in 
which either an integrated sample or a minimum of four grab samples 
shall be taken. If grab sampling is used, the samples shall be taken at 
approximately equal intervals in time such as 15-minute intervals 
during the run.
    (B) Calculate the mass rate of either TOC (minus methane and 
ethane) or total organic HAP (Ei, Eo using equations 16 and 
17:
[GRAPHIC][TIFF OMITTED]TR01SE95.018

where

Ei, Eo=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.
K2=constant, 2.494 x 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 deg. C.
n=number of sample components in the gas stream.
Cij, Coj=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.
Mij, Moj=molecular weight of sample component j of the gas 
stream at the inlet and outlet of the control device, respectively, 
gram/gram-mole.
Qi, Qo=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) measured by EPA Method 18 shall be 
summed using equation 16 in paragraph (h)(2)(iv)(B) of this section.
    (2) Where the mass rate of total organic HAP is being calculated, 
only the organic HAP species shall be summed using equation 17 in 
paragraph (h)(2)(iv)(B) of this section. The list of organic HAP is 
provided in Sec. 63.104 of subpart F of this part.
    (C) Calculate the destruction or removal efficiency for TOC (minus 
methane and ethane) or total organic HAP using equation 18:
[GRAPHIC][TIFF OMITTED]TR01SE95.019

where

R=destruction or removal efficiency of control device, percent.
Ei=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.
Eo=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 Fk 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 Verification of a Permanent or Temporary 
Total Enclosure as found in appendix B to Sec. 52.741 of part 52 of 
this chapter for total enclosures, and the capture efficiency protocol 
specified in Sec. 52.741(a)(4)(iii) of part 52 of this chapter for all 
other enclosures.
    (i)(1) Alternative application method--primers and topcoats. Each 
owner or operator seeking to use an alternative application method (as 
allowed in Sec. 63.745(f)(1)(ix)) in complying with the standards for 

[[Page 45973]]
primers and topcoats shall use the procedures specified in paragraphs 
(i)(2) and (i)(3) of this section to determine the organic HAP and VOC 
emission levels of the alternative application technique as compared to 
either HVLP or electrostatic spray application methods.
    (2)(i) For the process or processes for which the alternative 
application method is to be used, the total organic HAP and VOC 
emissions shall be determined for an initial 30-day period, the period 
of time required to apply coating to five completely assembled 
aircraft, or a time period approved by the permitting agency. During 
this initial period, only HVLP or electrostatic spray application 
methods shall be used. The emissions shall be determined based on the 
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 application method, use 
the alternative application method in production on actual production 
parts or assemblies for a period of time sufficient to coat an 
equivalent amount of parts and assemblies with coatings identical to 
those used in the initial 30-day period. The actual organic HAP and VOC 
emissions shall be calculated for this post-implementation period.
    (iii) Calculate both the organic HAP and VOC emission reduction 
using equation 19:
[GRAPHIC][TIFF OMITTED]TR01SE95.020

where

P=organic HAP or VOC emission reduction, percent.
Eb=organic HAP or VOC emissions, in pounds, before the alternative 
application technique was implemented, as determined under paragraph 
(i)(2)(i) of this section.
Ea=organic HAP or VOC emissions, in pounds, after the alternative 
application technique was implemented, as determined under paragraph 
(i)(2)(ii) of this section.

    (3) Each owner or operator seeking to demonstrate that an 
alternative application method achieves emission reductions equivalent 
to HVLP or electrostatic spray application methods shall comply with 
the following:
    (i) Each coating shall be applied such that the dried film 
thickness is within the range specified by the applicable 
specification(s) for the aerospace vehicle or component 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 alternative application method test period 
for similar aerospace vehicles or components.
    (iii) Failure to comply with these dried film thickness 
requirements shall invalidate the test results obtained under paragraph 
(i)(2)(i) of this section.
    (j) Spot stripping and decal removal. Each owner or operator 
seeking to comply with Sec. 63.746(b)(3) shall determine the volume of 
organic HAP-containing chemical strippers used per aircraft using the 
procedure specified in paragraphs (j)(1) through (j)(3) of this 
section.
    (1) For each chemical stripper used for spot stripping and decal 
removal, determine for each annual period the total volume as applied 
using the procedure specified in paragraph (d)(2) of this section.
    (2) Determine the total number of aircraft for which depainting 
operations began during the annual period as determined from company 
records.
    (3) Calculate the annual average volume of organic HAP used for 
spot stripping and decal removal per aircraft using equation 20:
[GRAPHIC][TIFF OMITTED]TR01SE95.021

where

C=annual average volume (gal per aircraft) of organic HAP-containing 
chemical stripper used for spot stripping and decal removal.
n=number of organic HAP-containing chemical strippers used in the 
annual period.
Vsi=volume (gal) of organic HAP-containing chemical stripper i 
used during the annual period.
A=number of aircraft for which depainting operations began during the 
annual period.

    (k) Organic HAP content level determination--compliant chemical 
milling maskants. For those uncontrolled chemical milling maskants 
complying with the chemical milling maskant organic HAP content limit 
specified in Sec. 63.747(c)(1) without being averaged, the following 
procedures shall be used to determine the mass of organic HAP emitted 
per volume of coating (less water) as applied.
    (1) For coatings that contain no exempt solvents, determine the 
total organic HAP content using manufacturer's supplied data or Method 
24 of 40 CFR part 60, appendix A to determine the VOC content. The VOC 
content shall be used as a surrogate for total HAP content for coatings 
that contain no exempt solvent. If there is a discrepancy between the 
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 content, then the analytical VOC content 
should be set equal to the formulation solvent content.
    (l) Organic HAP content level determination--averaged chemical 
milling maskants. For those uncontrolled chemical milling maskants that 
are averaged together in order to comply with the chemical milling 
maskant organic HAP content level specified in Sec. 63.747(c)(1), the 
procedure specified in paragraphs (l)(1) through (l)(4) of this section 
shall be used to determine the monthly volume-weighted average mass 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 control program.
    (1) Determine the total organic HAP weight fraction as applied of 
each chemical milling maskant used during 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) (using the procedure specified 
in paragraph (d)(2) of this section), and
    (ii) The total volume in gallons of all chemical milling maskants 
(less water) as applied by summing the individual 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 organic HAP 
emitted per unit volume (lb/gal) of chemical milling maskant (less 
water) as applied for all chemical milling maskants during each 30-day 
period using equation 21:
[GRAPHIC][TIFF OMITTED]TR01SE95.022


[[Page 45974]]

where

Ha=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 averaged.
WHi=weight fraction (expressed as a decimal) of organic HAP in 
chemical milling maskant i (less water) as applied during each 30-day 
period that is averaged.
Dmi=density (lb chemical milling maskant per gal coating) of 
chemical milling maskant i as applied during each 30-day period that is 
averaged.
Vmi=volume (gal) of chemical milling maskant i (less water) as 
applied during the 30-day period that is averaged.
Mlw=total volume (gal) of all chemical milling maskants (less 
water) as applied during each 30-day period that is averaged.

    (m) VOC content level determination--compliant chemical milling 
maskants. For those uncontrolled chemical milling maskants complying 
with the chemical milling maskant VOC content limit specified in 
Sec. 63.747(c)(2) without being averaged, 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.
    (1) Determine the mass of VOC emitted per unit volume of chemical 
milling maskant (lb/gal) (less water and exempt solvents) as applied, 
Gi, 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 Gi, compliance shall be based, except 
as provided in paragraph (m)(2)(ii) of this section, upon the VOC 
content obtained using EPA Method 24.
    (ii) If the VOC content of a chemical milling maskant obtained 
using EPA Method 24 would indicate noncompliance as determined under 
Sec. 63.749(h)(3)(i), an owner or operator may elect to average the 
chemical milling maskant with other uncontrolled chemical milling 
maskants and (re)calculate Ga (using the procedure specified in 
paragraph (n) of this section), provided appropriate and sufficient 
records were maintained for all chemical milling maskants included in 
the average recalculation. The (re)calculated value of Ga for the 
averaged chemical milling maskants shall then be used to determine 
compliance.
    (n) VOC content level determination--averaged chemical milling 
maskants. For those uncontrolled chemical milling maskants that are 
averaged together in order to comply with the chemical milling maskant 
VOC content limit specified in Sec. 63.747(c)(2), the procedure 
specified in paragraphs (n)(1) through (n)(4) of this section shall be 
used to determine 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 shorter 
averaging period as part of an ambient ozone control program.
    (1) Determine the VOC content of each chemical milling 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 chemical 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 chemical milling 
maskants (less water and exempt solvents) as applied by summing the 
individual volumes of each chemical milling maskant (less water and 
exempt solvents) as applied.
    (3) Calculate the volume-weighted average mass of VOC emitted per 
unit volume (lb/gal) of chemical milling maskant (less water and exempt 
solvents) as applied during each 30-day period using equation 22:
[GRAPHIC][TIFF OMITTED]TR01SE95.023

where

Ga=volume-weighted average mass of VOC per unit volume 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 averaged.
(VOC)mi=VOC content (lb/gal) of chemical milling maskant i (less 
water and exempt solvents) as applied during the 30-day period that is 
averaged.
Vmi=volume (gal) of chemical milling maskant i (less water and 
exempt solvents) as applied during the 30-day period that is averaged.
Mlwes=total volume (gal) of all chemical milling maskants (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 Ga, recalculation of Ga is 
required using the new value. If more than one chemical milling maskant 
is involved, the recalculation shall be made once using all of the new 
values.
    (ii) If recalculation is required, an owner or operator may elect 
to include in the recalculation of Ga 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 recalculations.
    (iii) The recalculated value of Ga under either paragraph 
(n)(4)(i) or (n)(4)(ii) of this section shall be used to determine 
compliance.
Sec. 63.751 Monitoring requirements.
    (a) Enclosed spray gun cleaners. Each owner or operator using an 
enclosed spray gun cleaner under Sec. 63.744(c)(1) shall visually 
inspect the seals and all other potential sources of leaks associated 
with each enclosed gun spray cleaner system at least once per month. 
Each inspection shall occur while the system is in operation.
    (b) Incinerators and carbon adsorbers--initial compliance 
demonstrations. Each owner or operator subject to the requirements in 
this subpart must demonstrate initial compliance with the requirements 
of Sec. 63.745(d), Sec. 63.746(c), and Sec. 63.747(d) of this subpart. 
Each owner or operator using a carbon adsorber to comply with the 
requirements in this subpart shall comply with the requirements 
specified in paragraphs (b)(1) through (b)(7) of this section. Each 
owner or operator using an incinerator to comply with the requirements 
in this subpart shall comply with the requirements specified in 
paragraphs (b)(9) through (b)(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 organic HAP or VOC 
emissions, the owner or operator shall fulfill the requirements of 
paragraph (b)(1) (i) or (ii) of this section.
    (i) The owner or operator shall establish as a site-specific 
operating parameter the outlet total HAP or VOC concentration that 
demonstrates 

[[Page 45975]]
compliance with Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d) as 
appropriate; or
    (ii) The owner or operator shall establish as the site-specific 
operating parameter the control device efficiency that demonstrates 
compliance with Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d).
    (iii) When a nonregenerative carbon adsorber is used to comply with 
Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d), the site-specific 
operating parameter value may be established as part of the design 
evaluation used to demonstrate initial compliance. Otherwise, the site-
specific operating parameter value shall be established during the 
initial performance test conducted according to the procedures of 
Sec. 63.750(g).
    (2) For each nonregenerative carbon adsorber, in lieu of meeting 
the requirements of Sec. 63.751(b)(1), the owner or operator may 
establish as the site-specific operating parameter the carbon 
replacement time interval, as determined by the maximum design flow 
rate and organic concentration in the gas stream vented to the carbon 
adsorption system. The carbon replacement time interval shall be 
established either as part of the design evaluation to demonstrate 
initial compliance or during the initial performance test conducted 
according to the procedures in Sec. 63.750(g) (1), (2), (3), or (4).
    (3) Each owner or operator venting solvent HAP emissions from a 
source through a room, enclosure, or hood, to a control device to 
comply with Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d) shall:
    (i) Submit to the Administrator with the compliance status report 
required by Sec. 63.9(h) of the General Provisions a plan that:
    (A) Identifies the operating parameter to be monitored 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 Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d), as appropriate; and
    (iii) Conduct monitoring in accordance with the plan submitted to 
the Administrator unless comments received from the Administrator 
require an alternate monitoring scheme.
    (4) Owners or operators subject to Sec. 63.751(b) (1), (2), or (3) 
shall calculate the site-specific operating parameter value, or range 
of values, as the arithmetic average of the maximum and/or minimum 
operating parameter values, as appropriate, that demonstrate compliance 
with Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d) during the 
multiple test runs required by Sec. 63.750 (g)(2) and (g)(1).
    (5) For each solvent recovery device used to comply with 
Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d), in lieu of meeting 
the requirements of paragraph (b)(1) of this section, the results of 
the material balance calculation conducted in accordance with 
Sec. 63.750(g)(1) may serve as the site-specific operating parameter 
that demonstrates compliance with Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d).
    (6) Continuous compliance monitoring. Following the date on which 
the initial compliance demonstration is completed, continuous 
compliance with Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d) of 
this subpart shall be demonstrated as outlined in this paragraph.
    (i) Each owner or operator of an affected source subject to 
Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d) of this subpart shall 
monitor the applicable parameters specified in paragraph (b)(6)(ii), 
(b)(6)(iii), or (b)(6)(iv) of this section depending on the type of 
control technique used.
    (ii) Compliance monitoring shall be subject to the following 
provisions:
    (A) Except as allowed by paragraph (b)(7)(iii)(A)(3) of this 
section, all continuous emission monitors shall comply with performance 
specification (PS) 8 or 9 in 40 CFR part 60, appendix B, as appropriate 
depending on whether VOC or HAP concentration is being measured. The 
requirements in appendix F of 40 CFR part 60 shall also be followed. In 
conducting the quarterly audits required by appendix F, owners or 
operators shall challenge the monitors with compounds representative of 
the gaseous emission stream being controlled.
    (B) If the effluent from multiple emission points are combined 
prior to being channeled to a common control device, the owner or 
operator is required only to monitor the common control device, not 
each emission point.
    (iii) Owners or operators complying with Sec. 63.745(d), 
Sec. 63.746(c), or Sec. 63.747(d) through the use of a control device 
and establishing a site-specific operating parameter in accordance with 
paragraph (b)(1) shall fulfill the requirements of paragraph 
(b)(7)(iii)(A) of this section and paragraph (b)(7)(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 concentration at both the inlet and 
the outlet whenever HAP from coating and paint stripping operations are 
vented to the control device, or when continuous compliance is 
demonstrated through a percent efficiency calculation; or
    (2) For owners or operators using a nonregenerative carbon 
adsorber, in lieu of using continuous emission monitors as specified in 
paragraph (b)(7)(iii)(A)(1) of this section, the owner or operator may 
use a portable monitoring device 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, operated, 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 representative of the compounds to be 
measured or shall be methane, and shall be at a concentration 
associated with 125% of the expected organic compound concentration 
level for the carbon adsorber outlet vent.
    (c) The probe inlet of the monitoring device shall be placed at 
approximately the center of the carbon adsorber outlet vent. The probe 
shall be held there for at least 5 minutes during which flow into the 
carbon adsorber is expected to occur. The maximum reading during that 
period shall be used as the measurement.
    (B) If complying with Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d) through the use of a carbon adsorption system with a 
common exhaust stack for all of the carbon vessels, the owner or 
operator shall not operate the control device at an average control 
efficiency less than that required by Sec. 63.745(d), Sec. 63.746(c), 
or Sec. 63.747(d) for three consecutive adsorption cycles.
    (C) If complying with Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d) through the use of a carbon adsorption system with 
individual exhaust stacks for each of the multiple carbon adsorber 
vessels, the owner or operator shall not operate any carbon adsorber 
vessel at an average control efficiency less than that required by 
Sec. 63.745(d), Sec. 63.746(c), or Sec. 63.747(d) as calculated daily 
using a 7 to 30-day rolling average.
    (D) If complying with Sec. 63.745(d), Sec. 63.746(c), or 
Sec. 63.747(d) through the use of a nonregenerative carbon adsorber, in 
lieu of the requirements of paragraph (b)(7)(iii)(B) or (C) of this 
section, the owner or operator may 

[[Page 45976]]
replace the carbon in the carbon adsorber system with fresh carbon at a 
regular predetermined time interval as determined in accordance with 
paragraph (b)(2) of this section.
    (iv) Owners or operators complying with Sec. 63.745(d), 
Sec. 63.746(c), or Sec. 63.747(d) by capturing emissions through a 
room, enclosure, or hood shall install, calibrate, operate, and 
maintain the instrumentation necessary to measure continuously the 
site-specific operating parameter established in 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) the operating parameter value established in 
accordance with paragraph (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-specific operating parameter 
value as the arithmetic average of the minimum operating parameter 
values that demonstrate compliance with Sec. 63.745(d)and 
Sec. 63.747(d) during the three test runs required by 
Sec. 63.750(h)(2)(iv).
    (8) All temperature monitoring equipment shall be installed, 
calibrated, maintained, and operated according to manufacturer's 
specifications. Every 3 months, facilities shall replace the 
temperature sensors or have the temperature sensors recalibrated. As an 
alternative, a facility may use a continuous emission monitoring system 
(CEMS) to verify that there has been no change in the destruction 
efficiency and effluent composition of the incinerator.
    (9) Where an incinerator other than a catalytic incinerator 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 firebox in a position before any 
substantial heat exchange occurs.
    (10) Where a catalytic incinerator is used, thermocouples, 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 demonstrated, including the initial performance 
test, the minimum combustion temperature as a site-specific operating 
parameter. This minimum combustion temperature shall be the operating 
parameter value that demonstrates compliance with Sec. 63.745(d) and 
Sec. 63.747(d).
    (12) For each catalytic incinerator, each owner or operator shall 
establish during each performance test during which compliance is 
demonstrated, including the initial performance test, the minimum gas 
temperature upstream of the catalyst bed and the minimum gas 
temperature difference across the catalyst bed as site-specific 
operating parameters. These minimum temperatures shall be the operating 
parameter values that demonstrate compliance with Sec. 63.745(d) and 
Sec. 63.747(d).
    (c) Dry particulate filter, HEPA filter, and waterwash systems--
primer and topcoat application operations.
    (1) Each owner or operator using a dry particulate filter system or 
a HEPA filter system to meet the requirements of Sec. 63.745(g)(2) 
shall continuously monitor the pressure drop across the system.
    (2) Each owner or operator using a waterwash system to meet the 
requirements of Sec. 63.745(g)(2) shall continuously monitor the water 
flow rate through the system.
    (d) Particulate filters and waterwash booths--depainting 
operations. Each owner or operator using a dry particulate filter or 
waterwash system in accordance with the requirements of 
Sec. 63.746(b)(4) shall continuously monitor the pressure drop across 
the particulate filters or the water flow rate through the waterwash 
system.
    (e) Use of an alternative monitoring method.
    (1) General. Until permission to use an alternative monitoring 
method has been granted by the Administrator under this paragraph, the 
owner or operator of an affected source shall remain subject to the 
requirements of this section.
    (2) After receipt and consideration of written application, the 
Administrator may approve alternatives to any monitoring methods or 
procedures of this section including, but not limited to, the 
following:
    (i) Alternative monitoring requirements when the affected source is 
infrequently operated; or
    (ii) Alternative locations for installing continuous monitoring 
systems when the owner or operator can demonstrate that installation at 
alternate locations will enable accurate and representative 
measurements; or
    (iii) Alternatives to the American Society for Testing and 
Materials (ASTM) test methods or sampling procedures specified in this 
section.
    (3) If the Administrator finds reasonable grounds to dispute the 
results obtained by an alternative monitoring method, requirement, or 
procedure, the Administrator may require the use of a method, 
requirement, or procedure specified in this section. If the results of 
the specified and the alternative method, requirement, or procedure do 
not agree, the results obtained by the specified method, requirement, 
or procedure shall prevail.
    (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 Administrator as described in paragraph 
(e)(4)(ii) of this section. The application may be submitted at any 
time provided that the monitoring method is not used to demonstrate 
compliance with a relevant standard or other requirement. If the 
alternative monitoring method is to be used to demonstrate compliance 
with a relevant standard, the application shall be submitted not later 
than with the site-specific test plan required in Sec. 63.7(c) (if 
requested) or with the site-specific performance evaluation plan (if 
requested), or at least 60 days before the performance evaluation is 
scheduled to begin.
    (ii) The application shall contain a description of the proposed 
alternative monitoring system and information justifying the owner's or 
operator's request for an alternative monitoring method, such as the 
technical or economic infeasibility, or the impracticality, of the 
affected source using the required method.
    (iii) The owner or operator may submit the information required in 
this paragraph well in advance of the submittal dates specified in 
paragraph (e)(4)(i) of this section to ensure a timely review by the 
Administrator in order to meet the compliance demonstration date 
specified in this subpart.
     (5) Approval of request to use alternative monitoring method.
    (i) The Administrator will notify the owner or operator of his/her 
intention to deny approval of the request to use an alternative 
monitoring method within 60 calendar days after receipt of the original 
request and within 60 calendar days after receipt of any supplementary 
information that is submitted. If notification of intent to deny 
approval is not received within 60 calendar days, the alternative 
monitoring method is to be considered approved. Before disapproving any 
request to use an alternative monitoring method, the Administrator will 
notify the applicant 

[[Page 45977]]
of the Administrator'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 Administrator notifies the applicant of his or 
her intention to disapprove the request, the Administrator will specify 
how much time the owner or operator will have after being notified of 
the intended disapproval to submit the additional information.
    (ii) If the Administrator approves the use of an alternative 
monitoring method for an affected source under paragraph (e)(5)(i) of 
this section, the owner or operator of such source shall continue to 
use the alternative monitoring method until approval is received from 
the Administrator 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 % O2 or nanograms per Joule 
(ng/J) of pollutant).
    (2) All emission data shall be converted into units specified in 
this subpart for reporting purposes. After conversion into units 
specified in this subpart, the data may be rounded to the same number 
of significant digits as used in this subpart to specify the emission 
limit (e.g., rounded to the nearest 1% overall reduction efficiency).


Sec. 63.752  Recordkeeping requirements.

    (a) General. Each owner or operator of a source subject to this 
subpart shall fulfill all recordkeeping requirements specified in 
Sec. 63.10 (a), (b), (d), and (f).
    (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) through (b)(5) of this section, as 
appropriate.
    (1) The name, vapor pressure, and documentation showing the organic 
HAP constituents of each cleaning solvent used at the facility.
    (2) For each cleaning solvent used in hand-wipe cleaning operations 
that complies with the composition requirements specified in 
Sec. 63.744(b)(1) or for semi-aqueous cleaning solvents used for flush 
cleaning operations:
    (i) The name of each cleaning solvent used;
    (ii) All data and calculations that demonstrate that the cleaning 
solvent complies with one of the composition requirements; and
    (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 cleaning operations 
that does not comply with the composition requirements in 
Sec. 63.744(b)(1), but does comply with the vapor pressure requirement 
in Sec. 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 appropriate, data, and 
calculations used to determine the composite vapor pressure of each 
cleaning solvent; and
    (iv) The amount (in gallons) of each cleaning solvent used each 
month at each operation.
    (4) For each cleaning solvent used for the exempt hand-wipe 
cleaning operations specified in Sec. 63.744(e) that does not conform 
to the vapor pressure or composition requirements of Sec. 63.744(b):
    (i) The identity and amount (in gallons) of each cleaning solvent 
used each month at each operation; and
    (ii) A list of the processes set forth in Sec. 63.744(e) to which 
the cleaning operation applies.
    (5) A record of all leaks from enclosed spray gun cleaners 
identified pursuant to Sec. 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 and topcoat application operations--organic HAP and VOC. 
Each owner or operator required to comply with the organic HAP and VOC 
content limits specified in Sec. 63.745(c) shall record the information 
specified in paragraphs (c)(1) through (c)(6) of this section, as 
appropriate.
    (1) The name and VOC content as received and as applied of each 
primer and topcoat used at the facility.
    (2) For uncontrolled primers (organic HAP content less than 350 g/l 
(2.9 lb/gal) less water as applied and VOC content less than 350 g/l 
(2.9 lb/gal) less water and exempt solvents as applied) and topcoats 
that meet the organic HAP and VOC content limits in Sec. 63.745(c)(1) 
through (c)(4) without averaging:
    (i) The mass of organic HAP emitted per unit volume of coating as 
applied (less water) (Hi) and the mass of VOC emitted per unit 
volume of coating as applied (less water and exempt solvents) (Gi) 
for each coating formulation within each coating category used each 
month (as calculated using the procedures specified in Sec. 63.750(c) 
and (e));
    (ii) All data, calculations, and test results (including EPA Method 
24 results) used in determining the values of Hi and Gi; 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/gal) 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 applied:
    (i) Annual purchase records of the total volume of each primer 
purchased; and
    (ii) All data, calculations, and test results (including EPA Method 
24 results) used in determining the organic HAP and VOC content as 
applied. These records shall consist of the manufacturer's 
certification when the primer is applied as received, or the data and 
calculations used to determine Hi if not applied as received.
    (4) For primers and topcoats complying with the organic HAP or VOC 
content level by averaging:
    (i) The monthly volume-weighted average masses of organic HAP 
emitted per unit volume of coating as applied (less water) (Ha) 
and of VOC emitted per unit volume of coating as applied (less water 
and exempt solvents) (Ga) for all coatings (as determined by the 
procedures specified in Sec. 63.750(d) and (f)); and
    (ii) All data, calculations, and test results (including EPA Method 
24 results) used to determine the values of Ha and Ga.
    (5) For primers and topcoats that are controlled by a control 
device other than a carbon adsorber:
    (i) The overall control efficiency of the control system (as 
determined using the procedures specified in Sec. 63.750(h)) and all 
test results, data, and calculations used in determining the overall 
control efficiency;
    (ii) If an incinerator other than a catalytic incinerator is used, 
continuous records of the firebox temperature recorded under 
Sec. 63.751(b)(9) and all calculated 3-hour averages of the firebox 
temperature; and
    (iii) If a catalytic incinerator is used, continuous records of the 
temperature recorded under Sec. 63.751(b)(10) and all calculated 3-hour 
averages of the recorded temperatures.
    (6) For primer and topcoats that are controlled by a carbon 
adsorber:
    (i) The overall control efficiency of the control system (as 
determined using the procedures specified in Sec. 63.750(g)) and all 
test results, data, and calculations used in determining the 

[[Page 45978]]
overall control efficiency. The length of the rolling material balance 
period and all data and calculations used for determining this rolling 
period. The record of the certification of the accuracy of the device 
that measures the amount of HAP or VOC recovered; or
    (ii) For nonregenerative carbon adsorbers, the overall control 
efficiency of the control system (as determined using the procedures 
specified in Sec. 63.750(g)) and all test results, data, and 
calculations used in determining the overall control efficiency. The 
record of the carbon replacement time established as the site-specific 
operating parameter to demonstrate compliance.
    (d) Primer and topcoat application operations--inorganic HAP 
emissions.
    (1) Each owner or operator complying with Sec. 63.745(g) for the 
control of inorganic HAP emissions from primer and topcoat application 
operations through the use of a dry particulate filter system or a HEPA 
filter system shall record the pressure drop across the operating 
system once each shift during which coating operations occur.
    (2) Each owner or operator complying with Sec. 63.745(g) through 
the use of a waterwash system shall record the water flow rate through 
the operating system once each shift during which coating operations 
occur.
    (3) This log shall include the acceptable limit(s) of pressure drop 
or water flow rate, as applicable, as specified by the filter or booth 
manufacturer or in locally prepared operating procedures.
    (4) If 3-stage or HEPA filters are used at a new facility to 
control emissions from chromated primers or topcoats, records shall be 
kept of documentation supplied by the filter manufacturer that the 
filters in use meet the 3-stage or HEPA filter requirements.
    (e) Depainting operations. Each owner or operator subject to the 
depainting standards specified in Sec. 63.746 shall record the 
information specified in paragraphs (e)(1) through (e)(7) of this 
section, as appropriate.
    (1) General. For all chemical strippers used in the depainting 
operation:
    (i) The name of each chemical stripper; and
    (ii) Monthly volumes of each organic-HAP containing chemical 
stripper used.
    (2) For HAP-containing chemical strippers that are controlled by a 
carbon adsorber:
    (i) The overall control efficiency of the control system (as 
determined using the procedures specified in Sec. 63.750(g)) and all 
test results, data, and calculations used in determining the overall 
control efficiency. The length of the rolling material balance period 
and all data and calculations used for determining this rolling period. 
The record of the certification of the accuracy of the device that 
measures the amount of HAP or VOC recovered; or
    (ii) For nonregenerative carbon adsorbers, the overall control 
efficiency of the control system (as determined using the procedures 
specified in Sec. 63.750(g)) and all test results, data, and 
calculations used in determining the overall control efficiency. The 
record of the carbon replacement time established as the site-specific 
operating parameter to demonstrate compliance.
    (3) For HAP-containing chemical strippers that are controlled by a 
control device other than a carbon adsorber:
    (i) The overall control efficiency of the control system (as 
determined using the procedures specified in Sec. 63.750(h)) and all 
test results, data, and calculations used in determining the overall 
control efficiency;
    (4) For each type of aircraft depainted at the facility, a listing 
of the parts, subassemblies, and assemblies normally removed from the 
aircraft before depainting. Prototype, test model or aircraft that 
exist in low numbers (i.e., less than 25 aircraft of any one type) are 
exempt from this requirement.
    (5) Non-chemical based equipment. If dry media blasting equipment 
is used to comply with the organic HAP emission limit specified in 
Sec. 63.746(b)(1):
    (i) The names and types of non-chemical based equipment; 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; and
    (F) The date that the malfunction was corrected.
    (6) Spot stripping and decal removal. For spot stripping and decal 
removal, the volume of organic HAP-containing chemical stripper used, 
the annual average volume of organic HAP-containing stripper used per 
aircraft, the annual number of aircraft stripped, and all data and 
calculations used.
    (7) Inorganic HAP emissions. The actual pressure drop across the 
particulate filters or the visual continuity of the water curtain and 
water flow rate for waterwash systems, once each shift in which the 
depainting process is in operation. This log shall include the 
acceptable limit(s) of the pressure drop as specified by the filter 
manufacturer and the visual continuity of the water curtain and water 
flow rate for waterwash systems as specified by the booth manufacturer 
or in locally prepared operating procedures.
    (f) Chemical milling maskant application operations. Each owner or 
operator seeking to comply with the organic HAP and VOC content limits 
for the chemical milling maskant application operation, as specified in 
Sec. 63.747(c), shall record the information specified in paragraphs 
(f)(1) through (f)(4) of this section, as appropriate.
    (1) For uncontrolled chemical milling maskants that meet the 
organic HAP or VOC content limit without averaging:
    (i) The mass of organic HAP emitted per unit volume of chemical 
milling maskant as applied (less water) (Hi) and the mass of VOC 
emitted per unit volume of chemical milling maskant as applied (less 
water and exempt solvents) (Gi) for each chemical milling maskant 
formulation used each month (as determined by the procedures specified 
in Sec. 63.750 (k) and (m));
    (ii) All data, calculations, and test results (including EPA Method 
24 results) used in determining the values of Hi and Gi; and
    (iii) The volume (gal) of each chemical milling maskant formulation 
used each month.
    (2) For chemical milling maskants complying with the organic HAP or 
VOC content level by averaging:
    (i) The monthly volume-weighted average masses of organic HAP 
emitted per unit volume of chemical milling maskant as applied (less 
water) (Ha) and of VOC emitted per unit volume of chemical milling 
maskant as applied (less water and exempt solvents) (Ga) for all 
chemical milling maskants (as determined by the procedures specified in 
Sec. 63.750 (l) and (n)); and
    (ii) All data, calculations, and test results (including EPA Method 
24 results) used to determine the values of Ha and Ga.
    (3) For chemical milling maskants that are controlled by a carbon 
adsorber:
    (i) The overall control efficiency of the control system (as 
determined using the procedures specified in Sec. 63.750(g)) and all 
test results, data, and calculations used in determining the overall 
control efficiency. The length of the rolling material balance period 
and all data and calculations used for determining this rolling period. 
The record of the certification of the accuracy of the device that 
measures the amount of HAP or VOC recovered; or
    (ii) For nonregenerative carbon adsorbers, the overall control 
efficiency of the control system (as determined using the procedures 
specified in Sec. 63.750(g)) and all test results, data, 

[[Page 45979]]
and calculations used in determining the overall control efficiency. 
The record of the carbon replacement time established as the site-
specific operating parameter to demonstrate compliance.
    (4) For chemical milling maskants that are controlled by a control 
device other than a carbon adsorber:
    (i) The overall control efficiency of the control system (as 
determined using the procedures specified in Sec. 63.750(h)) and all 
test results, data, and calculations used in determining the overall 
control efficiency;
    (ii) If an incinerator other than a catalytic incinerator is used, 
continuous records of the firebox temperature recorded under 
Sec. 63.751(b)(9) and all calculated 3-hour averages of the firebox 
temperature; and
    (iii) If a catalytic incinerator is used, continuous records of the 
temperature recorded under Sec. 63.751(b)(10) and all calculated 3-hour 
averages of the recorded temperatures.


Sec. 63.753  Reporting requirements.

    (a)(1) Except as provided in paragraphs (a)(2) and (a)(3) of this 
section, each owner or operator subject to this subpart shall fulfill 
the requirements contained in Sec. 63.9 (a) through (e) and (h) through 
(j), Notification requirements, and Sec. 63.10 (a), (b), (d), and (f), 
Recordkeeping and reporting requirements, of the General Provisions, 40 
CFR part 63, subpart A, except that the initial notification 
requirements for new or reconstructed affected sources in Sec. 63.9(b) 
(3) through (5) shall not apply. In addition to the requirements of 
Sec. 63.9(h), the notification of compliance status shall include:
    (i) Information detailing whether the source has operated within 
the specified ranges of its designated operating parameters.
    (ii) For each coating line, where averaging will be used along with 
the types and quantities of coatings the facility expects to use in the 
first year of operation. Averaging schemes shall be approved by the 
Administrator or delegated State authority and shall be included as 
part of the facility's title V or part 70 permit.
    (2) For the purposes of this subpart, a title V or part 70 permit 
application may be used in lieu of the initial notification required 
under Sec. 63.9(b)(2), provided the same information is contained in 
the permit application as required by Sec. 63.9(b)(2), and the State to 
which the permit application has been submitted has an approved 
operating permit program under part 70 of this chapter and has received 
delegation of authority from the EPA. Permit applications shall be 
submitted by the same due dates as those specified for the initial 
notifications.
    (3) For the purposes of this subpart, the Administrator will notify 
the owner or operator in writing of approval or disapproval of the 
request for an adjustment to a particular time period or postmark 
deadline submitted under Sec. 63.9(i) within 30 calendar days of 
receiving sufficient information to evaluate the request, rather than 
15 calendar days as provided for in Sec. 63.9(i)(3).
    (b) Cleaning operation. Each owner or operator of a cleaning 
operation subject to this subpart shall submit the following 
information:
    (1) Semiannual reports occurring every 6 months from the date of 
the notification of compliance status that identify:
    (i) Any instance where a noncompliant cleaning solvent is used for 
a non-exempt hand-wipe cleaning operation;
    (ii) A list of any new cleaning solvents used for hand-wipe 
cleaning in the previous 6 months and, as appropriate, their composite 
vapor pressure or notification that they comply with the composition 
requirements specified in Sec. 63.744(b)(1);
    (iii) Any instance where a noncompliant spray gun cleaning method 
is used;
    (iv) Any instance where a leaking enclosed spray gun cleaner 
remains unrepaired and in use for more than 15 days; and
    (v) If the operations have been in compliance for the semiannual 
period, a statement that the cleaning operations have been in 
compliance with the applicable standards. Sources shall also submit a 
statement of compliance signed by a responsible company official 
certifying that the facility is in compliance with all applicable 
requirements.
    (c) Primer and topcoat application operations. Each owner or 
operator of a primer or topcoat application operation subject to this 
subpart shall submit the following information:
    (1) Semiannual reports occurring every 6 months from the date of 
the notification of compliance status that identify:
    (i) For primers and topcoats where compliance is not being achieved 
through the use of averaging or a control device, each value of Hi 
and Gi, as recorded under Sec. 63.752(c)(2)(i), that exceeds the 
applicable organic HAP or VOC content limit specified in 
Sec. 63.745(c);
    (ii) For primers and topcoats where compliance is being achieved 
through the use of averaging, each value of Ha and Ga, as 
recorded under Sec. 63.752(c)(4)(i), that exceeds the applicable 
organic HAP or VOC content limit specified in Sec. 63.745(c);
    (iii) If incinerators are used to comply with the standards, all 
periods when the 3-hour average combustion temperature(s) is (are) less 
than the average combustion temperature(s) established under 
Sec. 63.751(b) (11) or (12) during the most recent performance test 
during which compliance was demonstrated;
    (iv) If a carbon adsorber is used;
    (A) each rolling period when the overall control efficiency of the 
control system is calculated to be less than 81%, the initial material 
balance calculation, and any exceedances as demonstrated through the 
calculation; or,
    (B) for nonregenerative carbon adsorbers, submit the design 
evaluation, the continuous monitoring system performance report, and 
any excess emissions as demonstrated through deviations of monitored 
values.
    (v) For control devices other than an incinerator or carbon 
adsorber, each exceedance of the operating parameter(s) established for 
the control device under the initial performance test during which 
compliance was demonstrated;
    (vi) All times when a primer or topcoat application operation was 
not immediately shut down when the pressure drop across a dry 
particulate filter or HEPA filter system, or the water flow rate 
through a waterwash system, as appropriate, was outside the limit(s) 
specified by the filter or booth manufacturer or in locally prepared 
operating procedures;
    (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 date of the 
notification of compliance status listing the number 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 from the date of 
the notification of compliance status that identify:
    (i) Any 24-hour period where organic HAP were emitted from the 
depainting 

[[Page 45980]]
of aerospace vehicles, other than from the exempt operations listed in 
Sec. 63.746 (a), (b)(3), and (b)(5).
    (ii) Any new chemical strippers used at the facility 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;
    (v) Any new non-chemical depainting technique in use at the 
facility since the notification of compliance status 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 non-chemical depainting operation subject 
to Sec. 63.746 (b)(2) and (b)(4) for the control of inorganic HAP 
emissions was not immediately shut down when the pressure drop or water 
flow rate was outside the limit(s) specified by the filter or booth 
manufacturer or in locally prepared operational procedures;
    (viii) A list of new and discontinued aircraft models depainted at 
the facility over the last 6 months and a list of the parts normally 
removed for depainting for each new aircraft model being depainted; and
    (ix) If the depainting operation has been in compliance for the 
semiannual period, a statement signed by a responsible company official 
that the operation was in compliance with the applicable standards.
    (2) Annual reports occurring every 12 months from the date of the 
notification of compliance status that identify:
    (i) The average volume per aircraft of organic HAP-containing 
chemical strippers used for spot stripping and decal removal operations 
if it exceeds the limits specified in Sec. 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 organic HAP 
emissions, semiannual reports that identify:
    (i) If a carbon adsorber is used,
    (A) each rolling period when the overall control efficiency 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 as demonstrated through the 
calculation; or,
    (B) for nonregenerative carbon adsorbers, submit the design 
evaluation, the continuous monitoring system performance report, and 
any excess emissions as demonstrated through deviations of monitored 
values.
    (ii) For control devices other than a carbon adsorber, each 
exceedance of the operating parameter(s) established for the control 
device under the initial performance test during which compliance was 
demonstrated;
    (iii) Descriptions of any control devices currently in use that 
were not listed in the notification of compliance status or any 
subsequent report.
    (e) Chemical milling maskant application operation. Each owner or 
operator of a chemical milling maskant application operation subject to 
this subpart shall submit semiannual reports occurring every 6 months 
from the date of the notification of compliance status that identify:
    (1) For chemical milling maskants where compliance is not being 
achieved through the use of averaging or a control device, each value 
of Hi and Gi, as recorded under Sec. 63.752(f)(1)(i), that 
exceeds the applicable organic HAP or VOC content limit specified in 
Sec. 63.747(c);
    (2) For chemical milling maskants where compliance is being 
achieved through the use of averaging, each value of Ha and 
Ga, as recorded under Sec. 63.752(f)(2)(i), that exceeds the 
applicable organic HAP or VOC content limit specified in 
Sec. 63.747(c);
    (3) Where a control device is used,
    (i) If incinerators are used to comply with the standards, all 
periods when the 3-hour average combustion temperature(s) is (are) less 
than the average combustion temperature(s) established under 
Sec. 63.751(b) (11) or (12) during the most recent performance test 
during which compliance was demonstrated;
    (ii) If a carbon adsorber is used,
    (A) each rolling period when the overall control efficiency of the 
control system is calculated to be less than 81%, the initial material 
balance calculation, and any exceedances as demonstrated through the 
calculation; or,
    (B) for nonregenerative carbon adsorbers, submit the design 
evaluation, the continuous monitoring system performance report, and 
any excess emissions as demonstrated through deviations of monitored 
values.
    (iii) For control devices other than an incinerator or carbon 
adsorber, each exceedance of the operating parameter(s) established for 
the control device under the initial performance test during which 
compliance was demonstrated;
    (4) All chemical milling maskants currently in use that were not 
listed in the notification of compliance status or any other subsequent 
semiannual report;
    (5) Descriptions of any control devices currently in use that were 
not listed in the notification of compliance status or any subsequent 
report; and
    (6) If the operations have been in compliance for the semiannual 
period, a statement that the chemical milling maskant application 
operation has been in compliance with the applicable standards.


Secs. 63.754-63.759  [Reserved]

    3. Section 63.14 is amended by adding paragraph (b)(7) to read as 
follows:


Sec. 63.14  Incorporations by reference.

* * * * *
    (b) * * *
    (7) ASTM E 260-91, Standard Practice for Packed Column Gas 
Chromatography, IBR approved for Sec. 63.750(b)(2) of subpart GG of 
this part.
* * * * *
[FR Doc. 95-21505 Filed 8-31-95; 8:45 am]
BILLING CODE 6560-50-P