Northern Sierra AQMD Rule 228 - 1 Amended 4/25/11 

Rules & Regulations 

Rule 228 Surface Coating of Metal Parts and Products 

Part 1.0 General 

1.1 Applicability 

Provisions of this Rule shall apply to surface coating of metal parts and products 

in portions of the Northern Sierra Air Quality Management District that are 

designated as Non-attainment for any federal ambient air quality standard for 

ozone (per 40 CFR 81.305). 

1.2 Exemptions 

1.2.1 Requirements of this Rule, except for Subsection 4.2 (Record 

Keeping), shall not apply to coating operations at facilities where total 

uncontrolled facility VOC emissions (excluding exempt compounds) from 

use of all coatings does not exceed 2.7 tons per rolling 12-month period 

(average of 15 pounds per day). 

1.2.2 Requirements of Subsection 3.3 (Application Equipment 

Requirements) of this Rule shall not apply to touch-up, repair, textured 

finishing or stenciling of identification numbers and letters, although VOC 

limits and work practices specified herein shall apply to such coatings. 

1.2.3 Requirements of this Rule shall not apply to coating of automobiles, 

light duty trucks, mobile equipment, aircraft, aerospace vehicles, marine 

vessels, cans, coils, magnetic wire, or magnetic data storage disks, or to 

coating with polyester resins, aerosol coatings or powder coatings. 

1.2.4 VOC limits and application methods specified herein shall not apply 

to graphic arts printing and coatings, stencil coatings, safety-indicated 

coatings, solid-film lubricant coatings, electric-insulating and thermalconducting coatings, or plastic extruded onto metal parts to form a 

coating, although work practices specified herein shall apply to such 

coatings. 

1.2.5 Up to 55 gallons of coatings exceeding the VOC content limits 

specified in section 3.1 and 3.2.1 may be used by a facility (including all 

units at that facility) per rolling twelve-month period. 

1.2.6 The provisions of this rule shall not apply to stripping of cured 

coatings, cured adhesives, and cured inks, except the stripping of such 

materials from spray application equipment. 

1.3 Effective Date 

This regulation shall become effective July 1, 2011. Until the effective date, the 

previously adopted version of Rule 228 shall remain effective. 
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Rules & Regulations 

Part 2.0 Definitions 

Air Dried Coating: A coating that is cured at a temperature below 194 degrees 

F (90 degrees C). 

 

APCO: Air Pollution Control Officer or Executive Director of the Northern Sierra 

Air Quality Management District, or an authorized representative thereof. 

ARB: California Air Resources Board. 

Baked Coating: A coating that is cured at a temperature at or above 194 

degrees F (90 degrees C). 

Camouflage Coating: A coating used to conceal items or equipment from visual 

detection. 

Clear Coating: A coating that either lacks color and opacity, or is transparent, 

and uses the surface to which it is applied as a reflective base or undertone 

color. 

Control Device: Equipment such as an incinerator or absorber used to prevent 

air pollutants from reaching the ambient air. 

Dip Coat: A coating method which is applied by dipping an object into a vat of 

coating material and allowing any excess coating material to drain off. 

Drum Coating: A coating used on a metal drums having a capacity ranging from 

12 to 110 gallons. 

Electrostatic Application: The electrical charging of atomized coating droplets 

for deposition by electrostatic attraction. 

Emission Control System: A control device and its associated collection 

system. 

Electric-Insulating Varnish: A non-convertible-type coating applied to electric 

motors, components of electric motors, or power transformers, to provide 

electrical, mechanical, and environmental protection or resistance. 

EPA: United States Environmental Protection Agency. 

Etching Filler: A coating that contains less than 23 percent solids by weight and 

at least 1/2-percent acid by weight, and is used instead of applying a 

pretreatment coating followed by a primer. 
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Rules & Regulations 

Exempt Compounds: Any compound specifically excluded from the definition of 

Volatile Organic Compound (VOC) in the Federal Register, codified at 40 CFR 

Part 51.100(s), as having negligible atmospheric photochemical reactivity. 

Extreme High-Gloss Coating: A coating which, when tested by the American 

Society for Testing Material (ASTM) Test Method D523 (Standard Test Method 

for Specular Gloss, 1980), shows a reflectance of 75 or more on a 60° meter. 

Extreme-Performance Coating: A coating that is used on a metal surface 

where the coated surface, in it’s intended use, is acutely or chronically exposed 

to salt water, corrosives, caustics, acids, oxidizing agents, wind or ocean driven 

debris, electromagnetic pulse or temperatures exceeding 250°F. 

Flow Coat: A non-atomized technique of applying coatings to a substrate with a 

fluid nozzle in a fan pattern with no air supplied to the nozzle. 

Heat-Resistant Coating: A coating that must withstand a temperature of at 

least 400°F during normal use. 

High-Performance Architectural Coating: A coating used to protect 

architectural subsections and which meets the requirements of the Architectural 

Aluminum Manufacturer Association's publication number AAMA 2604-05 

(Voluntary Specification, Performance Requirements and Test Procedures for 

High Performance Organic Coatings on Aluminum Extrusions and Panels) or 

2605-05 (Voluntary Specification, Performance Requirements and Test 

Procedures for Superior Performing Organic Coatings on Aluminum Extrusions 

and Panels). 

High Temperature Coating: A coating that is certified to withstand a 

temperature of 1000 degrees F (538 degrees C) for 24 hours. 

High-Volume, Low-Pressure Application (HVLP): Spray equipment which is 

designed to operate and is operated using a high volume of air delivered at 

atomized air pressures between 0.1 to 10.0 psig measured dynamically at the 

center of the air cap and at the air horns and which operates at a maximum fluid 

delivery pressure not exceeding the manufacturer's recommended inlet air 

pressure. 

Metal Parts and Products: Any metal parts or products except for those subject 

to coating requirements of other source-specific rules. 

Metallic Coating: A coating which contains more than 5 grams of metal 

particles per liter of coating as applied. “Metal particles” are pieces of a pure 

elemental metal or a combination of elemental metals. 
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Rules & Regulations 

Military Specification Coating: A coating which has a formulation approved by 

a United States Military Agency for use on military equipment. 

Mold-Seal Coating: The initial coating applied to a new mold or repaired mold 

and associated tooling to provide a smooth surface which, when coated with a 

mold release coating, prevents products from sticking to the mold or to the 

tooling. 

Multi-Component Coating: A coating requiring the addition of a separate 

reactive resin, commonly known as a catalyst or hardener, before application to 

form an acceptable dry film. 

One-Component Coating: A coating that is ready for application as it comes 

out of its container to form an acceptable dry film. A thinner, necessary to reduce 

the viscosity, is not considered a component. 

Pan Backing Coating: A coating applied to the surface of pots, pans, or other 

cooking implements that are exposed directly to a flame or other heating 

elements. 

Powder Coating: Any coating applied as a dry (without solvent or other carrier) 

finely divided solid, which when melted and fused, adheres to the substrate as a 

paint film. 

Prefabricated Architectural Component Coating: Any coating applied to 

metal parts and products which are intended for use as components of 

architectural structures. 

Pretreatment Coatings: Any coating, including wash primer, which contains no 

more than 12 percent solids by weight, and at least 1⁄2-percent acid, by weight, is 

used to provide surface etching, and is applied directly to metal surfaces to 

provide corrosion resistance, adhesion, and/or ease of stripping. 

Repair Coating: Recoating portions of previously coated product due to 

mechanical damage to the coating following normal painting operations. 

Roll Coater: A series of one or more mechanical rollers operating via the 

formation of a thin coating film on the surface of the roller(s), which is applied to a 

substrate by moving the substrate underneath the roller(s). 

Silicone-Release Coating: Any coating which contains silicone resin and is

intended to prevent food from sticking to surfaces such as baking pans. 

Solar-Absorbent Coating: A coating which has as its prime purpose the 

absorption of solar radiation. 
Northern Sierra AQMD Rule 228 - 5 Amended 4/25/11 

Rules & Regulations 

Stripping: The use of solvent to remove material such as cured adhesives, 

cured inks, cured or dried paint, cured or dried paint residue or temporary 

protective coating. 

Touch-Up Coating: Any coating used to cover minor coating imperfections 

appearing after the main coating operation. 

Transfer Efficiency: The ratio of the weight of coating solids which adhere to 

the object being coated to the weight of coating solids used in the application 

process, expressed as a percentage. 

Vacuum-Metalizing Coating: The undercoat applied to the substrate on which 

the metal is deposited or the overcoat applied directly to the metal film. 

Volatile Organic Compound (VOC): As defined in the Federal Register and 

codified at 40 CFR Part 51.100(s). 

Zinc Filled Primer: Any coating which has an elemental zinc content of not less 

than 240 grams/liter (2.0 pounds/gallon) of coating as applied. 
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Rules & Regulations 

Part 3.0 Requirements 

3.1. VOC Content Limits 

Except as provided in Subsection 3.2, no person shall apply to any metal part or 

product any coating with a VOC content in excess of the following limits as 

applied: 

VOC Content Limits (Weight of VOC per Volume of Coating, 

Less Water and Exempt Compounds) 

 Air Dried Air Dried Baked Baked 

Coating Category kg VOC/l lb VOC/gal kg VOC/l lb VOC/gal 

General Use, One-Component 0.34 2.8 0.28 2.3

General Use, Multi-Component 0.34 2.8 0.28 2.3

Camouflage 0.42 3.5 0.42 3.5

Electric-Insulating Varnish 0.34 2.8 0.28 2.3

Etching Filler 0.42 3.5 0.42 3.5

Extreme High-Gloss 0.42 3.5 0.36 3.0

Extreme Performance 0.42 3.5 0.36 3.0

Heat-Resistant 0.42 3.5 0.36 3.0

High Performance Architectural 0.42 3.5 0.42 3.5

High Temperature 0.42 3.5 0.42 3.5

Metallic 0.42 3.5 0.42 3.5

Military Specification 0.34 2.8 0.28 2.3

Mold-Seal 0.42 3.5 0.42 3.5

Pan Backing 0.42 3.5 0.42 3.5

Prefab Architectural Multi-Component 0.42 3.5 0.28 2.3

Prefab Architectural One-Component 0.42 3.5 0.28 2.3

Pretreatment Coatings 0.42 3.5 0.42 3.5

Repair and Touch-up 0.42 3.5 0.36 3.0

Silicone Release 0.42 3.5 0.42 3.5

Solar-Absorbent 0.42 3.5 0.36 3.0

Vacuum-Metalizing 0.42 3.5 0.42 3.5

Drum Coating, New, Exterior 0.34 2.8 0.34 2.8

Drum Coating, New, Interior 0.42 3.5 0.42 3.5

Drum Coating, Reconditioned, Exterior 0.42 3.5 0.42 3.5

Drum Coating, Reconditioned, Interior 0.50 4.2 0.50 4.2
Northern Sierra AQMD Rule 228 - 7 Amended 4/25/11 

Rules & Regulations 

3.2 Alternate Emissions Control 

3.2.1 Emission Rate Limitation: In lieu of complying with VOC content 

limits specified in Subsection 3.1, the following after-control weight-pervolume emission rates constitute compliance with this rule. 

VOC Emission Rate Limits (VOC Weight Per Volume Of Solids) 

 Air Dried Air Dried Baked Baked 

Coating Category kg VOC/l lb VOC/gal. kg VOC/l lb VOC/gal.

General Use, One-Component 0.54 4.52 0.40 3.35

General Use, Multi-Component 0.54 4.52 0.40 3.35

Camouflage 0.80 6.67 0.80 6.67

Electric-Insulating Varnish 0.54 4.52 0.40 3.35

Etching Filler 0.80 6.67 0.80 6.67

Extreme High-Gloss 0.80 6.67 0.61 5.06

Extreme Performance 0.80 6.67 0.61 5.06

Heat-Resistant 0.80 6.67 0.61 5.06

High Performance Architectural 0.80 6.67 0.80 6.67

High Temperature 0.80 6.67 0.80 6.67

Metallic 0.80 6.67 0.80 6.67

Military Specification 0.54 4.52 0.40 3.35

Mold-Seal 0.80 6.67 0.80 6.67

Pan Backing 0.80 6.67 0.80 6.67

Prefab Architectural Multi-Component 0.80 6.67 0.40 3.35

Prefab Architectural One-Component 0.80 6.67 0.40 3.35

Pretreatment Coatings 0.80 6.67 0.80 6.67

Silicone Release 0.80 6.67 0.80 6.67

Solar-Absorbent 0.80 6.67 0.61 5.06

Vacuum-Metalizing 0.80 6.67 0.80 6.67

Drum Coating, New, Exterior 0.54 4.52 0.54 4.52

Drum Coating, New, Interior 0.80 6.67 0.80 6.67

Drum Coating, Reconditioned, Exterior 0.80 6.67 0.80 6.67

Drum Coating, Reconditioned, Interior 1.17 9.78 1.17 9.78

3.2.2 In lieu of complying with VOC content limits specified in Subsection 

3.1 or the emission rate limitation in 3.2.1, air pollution control equipment 

with a VOC capture and control efficiency of at least 90% may be used in 

accordance with the manufacturer’s recommendations at all times while 

applying non-exempt coatings and thinners, and while using solvents for 

cleaning, provided that the facility holds a valid Authority to Construct or 

Permit to Operate issued by the APCO. 
Northern Sierra AQMD Rule 228 - 8 Amended 4/25/11 

Rules & Regulations 

3.3 Application Methods 

No person shall coat any metal part or product subject to provisions of 

Subsection 3.1 or 3.2.1 (but not 3.2.2) unless one or more of the following 

methods is used in accordance with equipment manufacturer's 

recommendations: electrostatic application, High Volume Low Pressure (HVLP) 

spray, flow coat, roll coater, dip coat (including electrodeposition), a system that 

atomizes principally by hydraulic pressure such as airless spray or air-assisted 

airless spray, or another application technology achieving a greater transfer 

efficiency than HVLP. 

3.4 Work Practices for Solvent Cleaning 

The following VOC limits and work practices shall apply to cleaning of spray 

guns, lines, tanks, floors and spray booths, as well as to cleaning and surface 

preparation of manufactured parts and products and other cleaning related to 

activities that are subject to the provisions of this Rule. This subsection does not 

apply to cleaning of solar cells, laser equipment, electrical and electronic 

components, scientific instruments, precision optics or application equipment for 

resins, inks or adhesives; or to small-scale (as determined by the APCO) 

activities undertaken exclusively for research, product development, performance 

testing or quality assurance testing; or to the use of pretreatment coatings; or 

where the capture and control efficiency option in 3.2.2 is employed. 

3.4.1 Surface Cleaning and Cleaning of Coatings Application Equipment: 

Solvents used for surface cleaning of parts and coatings application 

equipment shall comply with at least one of the following limits: 

a. Solvent shall have a VOC content of 25 grams or less per liter 

(0.21 lb/gal) of material; or 

b. Solvent shall have a VOC composite partial pressure of 8 mm Hg 

or less at 20°C (68°F). 

3.4.2 Work Practices for Cleaning -- Devices and Methods: No person 

shall perform solvent cleaning operations unless the solvent is not 

atomized during the process and all spent solvent is captured and kept in 

closed containers. The following cleaning devices or methods may be 

used: 

a. Wipe Cleaning. 

b. Spray bottles or containers with a maximum capacity of 16 fluid 

ounces from which solvents are applied without a propellant 

induced force or atomization of the contents. 

c. Cleaning equipment having a closed solvent container during 

cleaning operations, except when depositing and removing objects 

to be cleaned, and closed during non-operation except during 

maintenance and repair of the cleaning equipment itself. 

d. System totally enclosing guns, cups, nozzles, bowls, and other 

parts during washing, rinsing, and draining procedures. 

e. Non-atomized solvent flow method collecting cleaning solvent in 

a container or a collection system closed except for solvent 
Northern Sierra AQMD Rule 228 - 9 Amended 4/25/11 

Rules & Regulations 

collection openings and, if necessary, openings to avoid excessive 

pressure build-up inside the container. 

f. Solvent flushing method discharging solvent into a closed 

container, except for solvent collection openings and, if necessary, 

openings to avoid excessive pressure build-up inside the container. 

Discharged solvent from such equipment shall be collected in 

containers without atomizing into open air. Solvent may be flushed 

through the system by air or hydraulic pressure, or by pumping. 

3.5 Work Practices for Transfer, Storage and Disposal 

Regardless of VOC content, all VOC-containing coatings, thinners, solvents, 

waste materials and used clean-up media (such as rags and other absorbent 

materials) shall be stored, transferred and transported in non-absorbent, nonleaking containers which shall be kept closed at all times except when filling, 

using, emptying, mixing, pumping or otherwise actively working with the VOCcontaining substances. These materials shall not be disposed of through 

heating, emptying into a non-airtight container such as a trash can or dumpster, 

or otherwise allowed to evaporate. General work practices intended to prevent 

spillage (such as avoiding practices that allow materials to run down the outside 

of a drum or can and keeping containers where they are not likely to be knocked 

over) shall be employed. 

3.6 Prohibition of Specification 

No person shall solicit or require for use or specify application of a coating on 

metal parts and products if such use or application results in a violation of 

provisions of this Rule. This prohibition shall apply to all written or oral contracts 

under terms of which any coating subject to provisions of this Rule is to be 

applied to any metal part or product. 

Part 4.0 Administrative Requirements 

4.1 Labeling Requirements 

4.1.1 VOC Content: Each container (or accompanying data sheet) of any 

coating subject to this Rule shall display maximum VOC content of the 

coating as applied, including coating components, and after any thinning 

as recommended by the manufacturer. VOC content shall be displayed as 

grams of VOC per liter less water and exempt compounds. VOC content 

displayed shall be determined using Subsection 5.1. test methods or 

calculated using product formulation data. 

4.1.2 Thinning Recommendations: Each container (or accompanying data 

sheet) of any coating subject to this Rule shall display a statement of 

manufacturer's recommendation regarding thinning of the coating. This 

requirement shall not apply to thinning of coatings with water. 
Northern Sierra AQMD Rule 228 - 10 Amended 4/25/11 

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4.2 Record Keeping Requirements 

Any person subject to Section 3 or exempt by Subsection 1.2.1 shall maintain 

and have available for inspection: 

A current list of VOC containing products in use containing all data necessary to 

evaluate compliance, including the following information, as applicable: 

4.2.1 Product name, type and manufacturer. 

4.2.2 Application method. 

4.2.3 Usage instructions. 

4.2.4 Mixing instructions. 

4.2.5 Maximum VOC content of coating as applied, including thinning 

solvents, hardeners and other additives, and excluding water and exempt 

compounds. 

4.2.6 Coating composition and density. 

Monthly coating and solvent use records, including the following information for 

each: 

4.2.7 Volume and mix ratio of each component used. 

4.2.8 VOC content in grams/liter (or pounds/gallon) as applied/used. 

4.2.9 Volume applied/used in liters (or gallons). 

Capture and control equipment records, if applicable, including: 

4.2.10 Make, model and description of capture and control equipment, 

along with manufacturer’s instructions and operation recommendations. 

4.2.11 System operating parameters, including times of operation, 

adequate to demonstrate compliance with this Rule. 

4.2.12 Records of all control system maintenance (such as repairs and 

filter changes), including device, date performed, and description. 

All records shall be retained and made available for inspection by the APCO, 

ARB and EPA for at least three years. 

Part 5.0 Test Methods 

The following test methods shall be used to determine compliance with the provisions of 

this rule if testing is required by the APCO, ARB or EPA. Alternate test methods may 

be used provided they are approved by the APCO, ARB and EPA. A violation 

determined by any applicable test method below shall constitute a violation of this Rule. 

5.1 Analysis of Samples 

VOC content of coating materials covered by this Rule shall be determined by 

U.S. EPA Method 24 (Determination of Volatile Matter Content, Water Content, 

Density, Volume Solids, and Weight Solids of Surface Coatings, 40 CFR 60, 

Appendix A) or by manufacturer’s formulation data (MSDS sheet). In case of a 

discrepancy between these approaches, U.S. EPA Method 24 shall take 

precedence unless it is demonstrated that manufacturer’s data are correct. 
Northern Sierra AQMD Rule 228 - 11 Amended 4/25/11 

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Analysis of halogenated exempt compounds in coatings shall be performed using 

ARB Method 432 (Determination of Dichloromethane and 1,1,1-Trichloroethane 

in Paints and Coatings). 

5.2 Determination of Emissions

Emissions of VOC shall be measured by EPA Method 25 (Determination of Total 

Gaseous Nonmethane Organic Emissions as Carbon, 40 CFR 60, Appendix A), 

25A (Determination of Total Gaseous Organic Concentration Using a Flame 

Ionization Analyzer, 40 CFR 60, Appendix A), or 25B (Determination of Total 

Gaseous Organic Concentration Using a Nondispersive Infrared Analyzer, 40 

CFR 60, Appendix A), as applicable. Analysis of halogenated exempt 

compounds in emissions shall be performed using ARB Method 422 

(Determination of Volatile Organic Compounds in Emissions from Stationary 

Sources). 

5.3 Determination of Capture and Control Efficiency

The capture efficiency of a VOC emission control system’s collection device shall 

be determined according to EPA’s “Guidelines for Determining Capture 

Efficiency,” January 9, 1995 and the following EPA Test Methods, as applicable, 

contained in 40 CFR 51, Appendix M: Method 204A (Volatile Organic 

Compounds Content in Liquid Input Stream), 204B (Volatile Organic 

Compounds Emissions in Captured Stream), 204C (Volatile Organic Compounds 

Emissions in Captured Stream ((Dilution Technique))), 204D (Volatile Organic 

Compounds Emissions in Uncaptured Stream from Temporary Total Enclosure), 

Method 204E (Volatile Organic Compounds Emissions in Uncaptured Stream 

from Building Enclosure), 204F (Volatile Organic Compounds Content in Liquid 

Input Stream ((Distillation Approach))). The control efficiency of a VOC emission 

control system’s VOC control device shall be determined using EPA Method 2 

(Determination of Stack Gas Velocity and Volumetric Flow Rate ((Type S Pitot 

Tube)), 40 CFR 60, Appendix A), 2A (Direct Measurement of Gas Volume 

Through Pipes and Small Ducts, 40 CFR 60, Appendix A), or 2D (Measurement 

of Gas Volume Flow Rates in Small Pipes and Ducts, 40 CFR 60, Appendix A), 

as applicable, for measuring flow rates and EPA Methods 25 (Determination of 

Total Gaseous Nonmethane Organic Emissions as Carbon, 40 CFR 60, 

Appendix A), 25A (Determination of Total Gaseous Organic Concentration Using 

a Flame Ionization Analyzer, 40 CFR 60, Appendix A), or 25B (Determination of 

Total Gaseous Organic Concentration Using a Nondispersive Infrared Analyzer, 

40 CFR 60, Appendix A), as applicable, for measuring total gaseous organic 

concentrations at the inlet and outlet of the control device. EPA Method 18 

(Measurement of Gaseous Organic Compound Emissions By Gas 

Chromatography, 40 CFR 60, Appendix A) or ARB Method 422 (Determination of 

Volatile Organic Compounds in Emissions from Stationary 

Sources) shall be used to determine the emissions of exempt compounds. 
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Rules & Regulations 

5.4 Quantification of Metal Content in Coatings 

The quantification of metal content, for purposes of determining coating 

definitions or applicability of this Rule, shall be determined by South Coast Air 

Quality Management District Method 318-95 (Determination of Weight Percent 

Elemental Metal in Coatings by X-Ray Diffraction). 

5.5 Measurement of Acid Content 

Acid content of pre-treatment wash primers and etching fillers shall be conducted 

and reported in accordance with ASTM D1613 (Standard Test Method for Acidity 

in Volatile Solvents and Chemical Intermediates used in Paint, Varnish, Lacquer, 

and Related Products, 1996). 

5.6 Demonstration of Transfer Efficiency 

Transfer efficiency shall be demonstrated using South Coast Air Quality 

Management District Method TE (Spray Equipment Transfer Efficiency Test 

Procedure for Equipment User). 

5.7 Determination of VOC Composite Partial Pressures 

VOC composite partial pressures shall be determined using either manufacturer's 

information regarding formulation or using ASTM methods E168 (Standard 

Practices for General Techniques of Infrared Quantitative Analysis, 1992), E169 

(General Techniques of Ultraviolet Quantitative Analysis, 1993) or E260 (General 

Gas Chromatography Procedures, 1996) for determination of mole fractions and 

then summing products of each VOC component's vapor pressure and its mole 

fraction. For materials containing no non-VOC components, VOC composite 

partial pressure can be measured directly by ASTM Method D2879 (Standard 

Test Method for Vapor Pressure-Temperature Relationship and Initial 

Decomposition Temperature of Liquids by Isoteniscope, 1997). 

5.8 Determination of VOC Emissions From Spray Gun Cleaning Systems 

VOC emissions from spray gun cleaning systems shall be quantified using South 

Coast Air Quality Management District Method CS (Solvent Losses from Spray 

Gun Cleaning Systems). 

Part 6.0 Compliance Schedule 

6.1 Existing Sources 

Any person becoming subject to requirements of this Rule by loss of exemption 

shall comply with the following increments of progress: 

6.1.1 Within 6 months from date exemption is lost, submit a complete 

Authority to Construct application for control equipment, if necessary. 

6.1.2 Within 12 months from date exemption is lost, be in full compliance 

with all requirements of this Rule. 
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6.2 New Sources 

Any new proposed surface coating of metal parts or products operation not 

exempt by Section 1.2 shall demonstrate its ability to comply with the 

requirements of this Rule prior to issuance of an Authority to Construct permit.