Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 1 VENTURA COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 74.18 - MOTOR VEHICLE AND MOBILE EQUIPMENT COATING

OPERATIONS (Adopted 1/28/92, Revised 12/13/94, 9/10/96 , / / )

A. Applicability and Purpose

The provisions of this rule apply to any person who manufactures, distributes, supplies, sells, offers for sale, applies or solicits the use of, automotive coatings for motor vehicles, mobile equipment, and their parts or components. The purpose of this rule is to limit reactive organic compound (ROC) emissions from coatings and solvents used in production, repair, refinish, or maintenance operations where motor vehicles, mobile equipment, and associated parts and components are coated.

B. Requirements

1. No person shall coat any vehicles, mobile equipment, or their associated parts and components, using any coating wi th a Reactive Organic Compound (ROC) content in excess of the following limits:
Limits Grams of ROC per Liter of Coating, As Applied, Less Water and Exempt Organic Compounds

Coating Category Effective Adoption

Date Effective January 1

2009 Effective January 1,

2010

Adhesion Promoter 840 540 Clear Coating 250 Color Coating 760 420 Multi-Color Coating 840 680 Pretreatment Coating 780 660

Primer 250

Primer Sealer 340 250 Single

- Stage Coating
Nonmetallic/Noniridescent 420 340

Single Stage Metallic/Iridescent Coating 520 340

Temporary Protective Coating 420 60 Truck Bed Liner Coating 840 310 Underbody Coating 840 430 Uniform Finish Coating 840 540 Water-Reducible Electrophoretic Brake Component Coating 440

Any other coating type (default) 840 250 Formatted: Indent: Left: 0"

Formatted: Indent: Left: 0"

Formatted: Indent: Left: 0"

Formatted: Indent: Left: 0"

Formatted: Indent: Left: 0" Formatted: Indent: Left: 0"

Formatted: Indent: Left: 0" Deleted: specifies

Deleted: Group I Vehicles, Group II Vehicles/Equipment (color match required), and Small Production/Utility Bodies (color match required): *

Deleted: Group I

Deleted: any Group II vehicles and mobile equipment where color match is required, or any sm all production/utility bodies where color match is required,

Deleted: /P r imer Surfacer

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 2 2. Most Restrictive ROC Limit. If anyw here on the container of any automotive coating, or any label or sticker affixe d to the container, or in any sales, advertising, or technical literature suppl ied by a person, any representation is made that indicates that the coating meet s the definition of or is recommended for use for more than one of the coating categories listed in Subsection B.1, then the lowest ROC content limit shall apply.

3. Alternative Compliance ( Add-on Control Equipment Option ) :

A person may comply with the provisi ons of Subsection B.1 (coating limits) by using an emission control system provided that:

a. The combined control and capture efficiency shall reduce total organic compound (TOC) emissions from an emission collection system by at least 85 percent, by weight, and

b. Written approval in the form of an Authority to Construct and a Permit to Operate for such equipment is received from the Air Pollution Control Officer (APCO).

c. Any approved emission control system shall be maintained and used at all times in proper working condition.

4. Coating Application Methods ( Transfer Efficiency ) : No person shall apply any coating to any motor vehicle or mobile equipment or their associated parts and components unless one of the following methods is properly used:

a. Hand application methods including, but not limited to: brush, dip or
roller

b. Electrophoretic dip coating

c. Electrostatic application, operated at a minimum of 60 KV

d. High-Volume, Low-Pressure (HVLP) spray equipment: If a spray gun is used, the end user shall demonstrate that the spray gun meets the definition of HVLP in design and use. A satisfactory demonstration shall be based on the manufacturer’s publishe d technical material on the design of the gun and by a demonstration of the operation of the spray gun using an air pressure tip gauge from the spray gun manufacturer. Formatted: Indent: Left: 0", Hanging: 1", Tabs: 0.5", Left + 1",
Left Deleted: 2. Group II Vehicles/Equipment (no color match required), Small Production/Utility Bodies (no color match required) and Large Production/Utility Bodies: * No person shall coat Group II vehicles and equipment or their parts and components where color match is not required, small production/utility bodies where color match is not required, or large production/utility bodies, using any coating with a ROC content in excess of the following limits, expressed as grams of ROC per liter of coating applied, excluding water and exempt organic compounds:¶ ¶ Page Break Limits¶ Grams of ROC per Liter of Coating, Less Water¶ and Less Exempt Organic Compounds¶

¶
Pretreatment Wash Primer 780 Primer, Primer Surfacer, Primer

Sealer 250

Multistage Topcoat 340 Single Stage Metallic/Iridescent Topcoat 420

Single Stage Nonmetallic/Noniridescent Topcoat 340

Camouflage 420 Specialty Coating 840

Deleted: a.

Deleted: s

Deleted: or B.2

Deleted: air pollution control equipment

Deleted: 1.

Deleted: 2.

Deleted: b. A person may comply with the provisions of Subsection B.4 (transfer efficiency) by using add-on control equipment provided the combined control and capture efficiency is at least 92 percent, by weight.

Deleted: Group I or II

Deleted: exterior

Deleted: application

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 3 e. Alternative Application Method: Any other alternative method that achieves a transfer efficiency equivalent to, or higher than, one of the application methods listed in Subsections B.4.a, B.4.b, B.4.c, or B.4.d. Written approval of the APCO shall be obtained for each alternative method prior to use.

5. Prohibition of Specification: No pers on shall solicit or require for use or specify the application of any automotive coating or cleaning solvent on any motor vehicle, mobile equipment, or their associated parts or components if such use or application results in a violation of the provisions of this Rule. The prohibition of this Subsection shall apply to all written or oral contracts , including, but not limited to job orders, under the terms of which any coating or solvent which is subject to the provisions of this Rule is to be applied to any motor vehicle, mobile equipment, or their associated parts and components at any physical location
within the District.

6. Prohibition of Sale:

a. Except as provided in Subsecti ons B.6.b and B.6.c, no person shall manufacture, blend, repackage for sale, supply, offer for sale or sell, or distribute within the District, any coating that is regulated by Subsection B.1, of this Rule if the applicati on of such product is prohibited, at the
time of sale.

b. The prohibition in Subsection B.6.a sha ll apply to the sale of any coating that will be applied at any physical location within the District and shall not apply to any coating shipped outside of the District for use outside of the District, sold in the District for use outside the District , or manufactured in the District for use outside the District

.

c. The prohibition in Subsection B.6.a sha ll not apply to the sale of coatings where the emissions to the atmosphere from the application of those coatings are controlled by an APCD

- approved emission control system that meets the requirements of Subsection B.3.

d. Any person claiming an exemption from the sales prohibition as allowed by Subsection B.6.b or B.6.c shall keep a detailed log of each automotive coating and component manufactured , blended, repackaged for sale, supplied, sold, offered for sale, or distributed that lists:

1). The quantity manufactured, blended, repackaged for sale, or distributed, including size and number of containers;

2) The VOC regulatory and VOC actual for coatings; Formatted: Indent: Left: 0", Hanging: 2"

Formatted: Indent: Left: 0", Hanging: 2.5" Deleted: Any other coating application

method which has been demonstrated to be capable of achieving at least 65

p ercent transfer efficiency.

Deleted: a

Deleted: a Group I or II

Deleted: their

Deleted: and B.6.d,

Deleted: s

Deleted: B.2 or B.12

Deleted: b. The sales prohibition in Subsection B.6.a shall not apply to the sale of any coating supplied in a nonaerosol container with a capacity of 16 fluid ounces or less, and shall not apply to any coating in an aerosol

container.

Deleted: c.

Deleted: or

Deleted: d.

Deleted:

Deleted: ROC add-on control device

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 4 3) To whom they were supplied, sold, offered for sale, or distributed, or for whom they were manufactured, blended, or repackaged for sale including the name, addres s, phone number, retail license number, and valid district permit number

4) Identification of which exemption is being utilized.

7. Compliance Statement Requirement s :

a. For each individual automotive co ating or coating component, the manufacturer and repackager shall include the following information on product data sheets or an equivalent medium:

1). The VOC actual for coatings and VOC regulatory for coatings, expressed in grams per liter; 2). The weight percentage of volatiles, water, and exempt compounds; 3). The volume percentage of water and exempt compounds; and 4). The density of the material (in grams per liter).

b. For each individual ready to spra y mixture (based on the manufacturer’s and repackager’s stated mix ratio), the manufacturer and repackager shall include the following information on pr oduct data sheets, or an equivalent
medium:

1) The VOC actual for coatings and VOC regulatory for coatings, expressed in grams per liter; 2) The weight percentage of volatiles, water, and exempt compounds; 3) The volume percentage of water and exempt compounds; and 4) The density of the material (in grams per liter)

c. The manufacturer and repackager of a cleaning solvent subject to this rule shall include the VOC content, as s upplied, expressed in grams per liter, on product data sheets, product la bels, or an equivalent medium.

8. Surface Preparation and Cleaning Operations : The requirements of this

s ubsection shall apply to any person using organic solvent for surface preparation
and cleaning operations

.

a

. Until January 1, 2010, n o person shall use organic solvent for cleaning operations, unless

, Formatted: Indent: Left: 0", Hanging: 1.5"

Formatted: Indent: Left: 0", Hanging: 2"

Formatted: Indent: Left: 0", Hanging: 1.5"

Formatted: Indent: Left: 0", Hanging: 2"

Formatted: Indent: Left: 0", Hanging: 1.5"

Formatted: Indent: Left: 0", Hanging: 1.5" Formatted: Indent: Left: 0", Hanging: 2"

Deleted: The manufacturer of coatings subject to this Rule shall include a designation of the VOC content as supplied, including coating components, expressed in grams per liter or pounds per gallon, excluding water and exempt organic compounds, on labels or data sheets. This design ation shall include a

statement of manufacturer's recommendation regarding thinning, reducing, or mixing with any other VOC containing materials. This statement shall include the VOC on an as-applied basis, excluding water and exempt organic compounds, based on the manufacturer's

recommendations.

Deleted: Cleanup Solvent

Deleted: S

Deleted: cleanup

Deleted: a. Closed containers shall be used for the storage or disposal of solvent-containing cloth or paper used for surface preparation and cleanup.

Containers shall be nonabsorbent.

Deleted: b

Deleted: N

Deleted: cleanup

Deleted: :

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 5 1) An enclosed gun washer or "low emission spray gun cleaner" that has been approved in writing by the APCO is properly used for spray equipment cleaning, and

2) The ROC composite partial pressure of organic solvent used for cleanup, including spray equipment cleaning, is less than 45 mm Hg at a temperature of 20 o C .

b. Until January 1, 2010, n o person shall use ROC-containing materials
which have a n ROC content exceeding 200 grams per liter of material for substrate surface preparation prior to coating.

c. Effective January 1, 2010, no person shall use a solvent for any cleaning operation that has an ROC content exceeding 25 grams per liter of
material.

9. Storage of ROC-Containing Materials: All automotive coating components, automotive coatings and solvents includi ng all ROC-containing materials shall be stored in closed vapor-tight, non-leaking, nonabsorbent containers, except while adding or removing them from containers.

10. Prohibition of Possession:

a. Coatings: No person shall possess at any automotive refinishing facility, any automotive coating that is not in compliance with Subsection B.1 (unless Alternative Compliance is used pursuant to Subsection B.3), or any aerosol coating that is not in compliance with CARB regulations.

b. Solvents: Effective January 1, 2010, no person shall possess at any automotive refinishing facility, any solvent designated by labels or technical data sheets as applicable for automotive cleaning operations that has an ROC content exceeding 25 grams per liter of material, excluding:

1) Paint strippers or paint removers having labels or technical data sheets indicating the primary purpos e of the product is to remove cured coatings.

2) Surface preparation cleaning solvents listed in an approved Low Usage Exempt Surface Prep Cleaner Compliance Plan and identified by a unique label, tag or sticker that is described in the Compliance Plan. Formatted: Indent: Left: -0.5"

Formatted: Indent: Left: 0", Hanging: 2"

Formatted: Indent: Left: 0", Hanging: 1.5"

Formatted: Indent: Left: 0", Hanging: 2" Formatted: Indent: Left: 0", Hanging: 1.5" Deleted: c.

Deleted: N

Deleted: of more than

Deleted: 9. Liquid Cleaning Material Compliance Statement: Effective September 10, 1997, the manufacturer of liquid cleaning materials used in coating operations shall designate on product
labels or data sheets the ROC content and ROC Composite Partial Pressure of cleaning materials as supplied. This designation shall include recommendations regarding mixing with any other ROC containing materials, and express the cleaning material ROC

content when used in accordance with the

manufacturer's recommendations. All letters and numbers used to designate

ROC or VOC content on product labels shall be visible and legible.¶

Deleted: 10. Storage of ROCContaining Materials: All ROC containing materials, including but not limited to, fresh or spent solvent, coatings and reducers, shall be kept in closed

containers when not in use.

Deleted: 11. Specialty Coatings: No person shall use any specialty coating

with a ROC content in excess of 840 grams of ROC per liter of coating applied, excluding water and exempt organic compounds. Use of all specialty coatings, except antiglare/safety coatings, shall not exceed 10.0 percent of all coatings applied, averaged on a monthly (calendar) basis.

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 6 11. Air Toxic Control Measure for Coatings Containing Hexavalent Chromium or Cadmium: No person shall apply any coatings to any motor vehicle, mobile equipment, or their parts or components , if that coating c ontains hexavalent
chromium or cadmium.

12. Spray Booth and Prep Stations: No person shall apply any coating to any motor vehicle, mobile equipment, or their parts or components, unless that application is performed within a properly maintained and operated stationary Spray Booth or properly maintained and operated Prep Station.

13. Labeling Requirements: All letters or numbers on product labels designating
VOC or ROC content shall be visible and legible.

a. The manufacturer or repackager of automotive coatings shall include the applicable use category(ies), and the VOC actual for coatings and VOC regulatory for coatings, as supplied, expressed in grams per liter on all coating containers. Alternatively, the coating manufacturer may include
other container label information that enables the determination of compliance with the ROC content limit s in Subsection B.1., use of which has been approved in writing by the APCO.

b. The manufacturer and repackager of solvents subject to this rule shall
include on all containers the VOC content for solvents, as supplied, expressed in grams per liter.

14. OSHA Standards for Spray Finish ing Using Flammable and Combustible Materials: No person shall operate an automotive coating operation unless all provisions of California OSHA standard s are met including, but not limited to CCR Title 8, Division 1, Chapter 4, Subchapter 7, Group 20 (Flammable Liquids), Article 137 (Spray Coating Operations).

These standards are referenced because of the flammability hazard posed by acetone-based cleaners, which may be used to comply with provisions of this rule.
In no event shall the APCD be liable to any person or business using these
cleaners.

C. Exemptions

1. Any motor vehicle or mobile equipm ent coating operation which uses only handheld, nonrefillable aerosol coating cans, 16 ounces or less (NET WT), shall be exempt from this rule. Formatted: Indent: Left: 0", Hanging: 1.5" Formatted: Indent: Left: 0", Hanging: 1.5"

Deleted: ¶

Deleted: 13. Coatings Containing 1,1,1-Trichloroethane: No person shall apply any coating to any motor vehicle, mobile equipment, or their parts or components, if that coating contains 1,1,1-trichloroethane.

Deleted: 14. Pretreatment Wash Primers: No person shall apply a pretreatment wash primer if the amount

used has exceeded 10 percent of the total volume of all undercoats applied, averaged on a monthly (calendar) basis.

Deleted: 15. Adhesion Promoters: No person shall use, sell, or offer for sale adhesion promoters as a topcoat.

Deleted: ¶

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 7 2. This rule does not apply to any aerosol coatings that are in compliance with regulations and requirements adopted by the California Air Resources Board (California Code of Regulation, Title 17, Subchapter 8.5, Section 94522).

3. This rule shall not apply to any auto motive coating that is sold, supplied, or
offered for sale in 0.5 fluid ounce or sma ller containers intended to be used by the general public to repair tiny surface imperfections.

4. With prior written approval of the AP CO, the requirements of Subsection B.12, Spray Booths and Prep Stations, shall not apply to the coating of motor vehicle(s) which due to shape or size, cannot reas onably be contained in any available substitute spray booth. A person wishing to qualify for this exemption must comply with the following requirements:

a. A written petition must be submitted to the APCO stating the motor vehicle(s) to be coated, the size of the substitute spray booth available, the physical size of the motor vehicle(s) (i.e. length, width, and height), number of motor vehicle(s) to be coated, estimated volume of coating used, and the ROC content, , and lead content of each coating used.

b. The coatings used shall not contai n any lead with the exception of weldthru primers.

c. If the APCO grants written approval, then such approval shall:

1) Be valid only for the coati ng operation and coatings specified in the petition

,

2) Contain limits on coating volume

,

3) and may c ontain a time limit not to exceed one year.

5. The requirements of Subsection B.12, Sp ray Booths and Prep Stations, shall not apply to the application of:

a. Any undercoat that does not contain lead, and is:

1) Limited to one major panel or

2) Applied to an interior part of a motor vehicle, where that part can only be coated while the motor vehicle is immobilized. Formatted: Font: Not Bold

Formatted: Indent: Left: 0", Hanging: 1" Deleted: 2. Subsection B.4, which specifies the co ating application transfer efficiency, shall not apply to coatings applied from hand-held, nonrefillable

aerosol cans.

Deleted: 3. Subsection B.8.b.2, which specifies the ROC composite partial pressure of solvents in spray gun washing equipment, shall not apply to the testing of such equipment if performed in

accordance with th e test method in

Subsection E.7.

Deleted: on a case by case basis

Deleted: chromium content

Deleted: or chromium,

Deleted:

.

Deleted:

.

Deleted: C

Deleted: chromium or

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 8 b. Any weld-thru primer.

c. Any coating that does not contain lead and is applied to a motor vehicle engine compartment or a mating assembly of engine and suspension
components.

6. The requirements of B.4 (Transfer Effici ency), and B.12 (Spray Booths) shall not apply to mobile automotive touch-up coating operations provided that:

a. Application is done using either a paint brush or an air brush with a cup that holds no more than 4 ounces of paint, and

b. Coatings applied contain no lead .

7. The requirements of B.12 (Spray Booths) shall not apply to touch-up coating of vehicles, m obile equipment , or their associated parts or components using a paint
brush or roller.

8. This rule shall not apply to a “Clean Air Solvent,” which has been certified in writing by the South Coast AQMD, and wh ich is defined in SCAQMD Rule 102.

9. This rule shall not apply to the posse ssion or use of any non-aerosol glass cleaner as long as the cleaner is used solely for cleaning glass and is identified as a glass cleaner on its applicator. Only those cleaners identified by the manufacturer on container labels, sales, and technical literature as formulated for the cleaning of glass shall qualify for this exemption.

10. This rule shall not apply to any agricu ltural sources of air pollution, which means a source of air pollution or a group of sources used in the production of crops, or the raising of fowl or animals located on contiguous property under common ownership or control.

11. Color coatings manufactured prior to January 1, 2009, which have an ROC content greater than 420 grams per liter but less than 760 grams per liter, may be possessed, sold, supplied, offered for sale, or applied until July 1, 2009.

12. The solvent cleaning ROC content requirement in Subsection B.8.c. shall not apply to any person using a surface prep aration cleaner, predesignated as exempt in an approved compliance plan, which is used to remove dust, grease, wax, or any other contaminant from a surface prior to sanding provided all the following requirements have been met:

a. Prior written approval of the APCO has been obtained on a Low-Usage Exempt Surface Preparation Cleaner Compliance Plan that has all of the following information: Formatted: Indent: Left: 0", Hanging: 1.5" Deleted: or chromiu m

Deleted: or chromium

Deleted: of B.4 (Transfer Efficiency),

and

Deleted: Group II Vehicles/

Deleted: M

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 9 1) List of all exempt surface preparation cleaners to be used including Name of Product, Product Number, Product Manufacturer and
Container Sizes. 2) Description of label or sticker to be placed on each container, which designates it as a low-use exempt surface preparation cleaner. All such labeled cleaners shall be listed in the plan inventory to qualify for exempt status. 3) The MSDS or Product Data Sheet for each exempt surface preparation cleaner that provides VOC information that can be used to calculate pounds of VOC per container. An aerosol cleaner shall be assumed to be 100 percent by weight VOC unless it contains an exempt VOC as defined by VCAPCD Rule 2, Exempt Organic Compounds. 4). Name of Vendor for each exempt surface preparation cleaner.

b. Total usage of all exempt surface preparation cleaners shall be limited so that total VOC emissions do not exceed 130 pounds per calendar year per stationary source based solely on purc hase records for that year with no emission credit for any waste solvent generation.

c. The VOC content of non-aerosol cleaners shall not exceed 6.51 pounds of VOC per gallon.

d. Wipe cleaning solvents shall be disp ensed so that containers are closed except when dispensing solvent or replenishing solvent supply.

13. The provisions of Subsection B.13, Labe ling Requirements, shall not apply to any coating manufactured prior to July 1, 2008, provided that the relevant date of
manufacture or date code information is submitted to APCD upon request by district personnel.

D. Recordkeeping Requirements

1. Any person subject to this rule shall:

a. Maintain and have available at all times, on site, and make available to District personnel upon request , a current list of in-house coatings and cleaning solvents that provides all of the data necessary to evaluate compliance, including the following information for each coating and cleaning solvent , as applicable:

1) Material name, product ID and product manufacturer.

2) Mix ratio of components used specific to each coating. Formatted: Indent: Left: 0", Hanging: 1"

Formatted: Font: Not Bold Formatted: Indent: Left: 0", Hanging: 2"

Formatted: Indent: Left: 0", Hanging: 1.5"

Formatted: Indent: Left: 0", Hanging: 2" Deleted: (including specialty coatings)

Deleted: coating

Deleted: Coating

Deleted:

,
Deleted: catalyst and reducer used

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 10 3) ROC content of coating as applied (less water and less exempt organic compounds) , and ROC content for each cleaning solvent.

4) Coating category from Subsection B.1 that corresponds with each coating used , and whether a material is a coating or cleaning
solvent.

5) Whether or not a coating cont ains any lead, if that coating is applied outside of a spray booth or prep station.

6) VOC Regulatory of each coating used, as documented by a current
manufacturer’s data sheet.

7) VOC Actual of each cleaning solvent used, as documented by a
current manufacturer’s data sheet.

b. Maintain monthly purchase records showing all coatings and cleaning solvents purchased for that mont h, available upon request by APCD personnel, that have the following information:

1) For each coating, the coating category from Subsection B.1; 2) Product manufacturer and product number; and 3) Volume of product purchased including container size and quantity of containers purchased.

c. Maintain monthly records or manifests of the amount cleaning solvent recycled or disposed of. All hazardous waste must be disposed of in a manner that complies with all local , state, and federal regulations. Formatted: Indent: Left: -0.5" Deleted: s

Deleted: , B.2 or B.10

Deleted: chromium or

Deleted: b. Maintain records which show on a daily basis the following

information:

Deleted: 1) Coating identification and mix ratio of components used in each coating or quantity of each component used.¶

Deleted: 2) Quantity of each coating (including each sp ecialty coating) applied. This quantity need not include toners that are added for color matching after preparation of the initial weighed

color batch.

Deleted: 3) Type of vehicle coated (Group I or II)¶

Deleted: 4) For coatings applied outside of a Spray Booth or Prep Station, list major panel coated or interior part of

immobilized vehicle coated.

Deleted: 2. Any person subject to the requirements of this rule shall have the manufacturer's specif ication sheets of

solvents used for substrate surface cleaning and application equipment cleanup available for review and shall

maintain records which show on a monthly basis, the following for each

solvent:

Deleted: a. Identification of each

solvent and its use.

Deleted: b. ROC content of solvent, in grams per liter

Deleted: c. Volume of solvent used. If purchase records are used to determine the amount of solvents used, then records

and manifests of the amounts of solvents disposed of or sent to a recycler must also

b e maintained.

Deleted: 3. Any person producing utility bodies must keep records of the number of utility bodies coated each day.

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 11 2. Any person using an emission control system pursuant to Subsection B.3 as a means of complying with this rule shall maintain daily records of key system operating and maintenance procedures which will demonstrate continuous operation and compliance of the emission control device during periods of TOC emission producing activities. Key sy stem operating parameters are those
necessary to ensure comp liance with subsection B.3 including, but not limited to,
temperatures, pressure drops, and air flow rates.

3. All records shall be retained for a minimum of two years from the date of each entry and shall be made available to District personnel upon request.

E. Test Methods

The following test methods are incorporated by reference herein, and shall be used to test emission sources subject to the provisions of this rule. A source is in violation of this rule if any measurement by any of the lis ted applicable test methods exceeds any
standard of this rule.

1. ROC Content of Coatings or Solvents: Coating ROC content shall be determined using EPA Method 24 (40 CFR Part 60 Appendix A, “Determination of Volatile Matter Content, Water Content, Density, Volume Solids, and Weight Solids of Surface Coatings”)

. Compliance with the prohibition of sale (Subsection B.6) shall be determined by measuring the ROC content of each and every component of a coating or coating system which has been reduced using the manufacturer's recommended type and maximum amount of reducer.

2. Exempt Organic Compound Content of Coatings: The exempt organic compound content of coatings or solvents shall be determined using ASTM Method D6133- 02, Standard Test Method for Acetone, p- Chlorobenzotrifluoride, Methyl Acetate, or t-Butyl Acetate Content of Solventborne and Waterborne Paints, Coatings, Resins, and Raw Materials by Direct Injection into a Chromatograph

. Exempt organic compound content, other than as determined above, shall be determined by using CARB Method 432, “Determination of Dichloromethane and 1,1,1- Trichloroethane in Paints and Coatings” (September 12, 1998); CARB Method 422, “Determination of Volatile Organic Compounds in Emissions from Stationary Sources” (January 22, 1987); or South Coast AQMD Method 303-91, “Determination of Exempt Compounds” (February 1993).

3. The measurement of acid content of pretreatment coatings shall be done in
accordance with ASTM Method D 1613- 03 , Standard Test Method for Acidity in Volatile Solvents, and Chemical Intermedia tes Used in Paint, Varnish, Lacquer,
and Related Products

.

4. The measurement of the metal and silicon content of metallic/iridescent coatings shall be determined by Method 311 (Det ermination of Percent Metal in Metallic Formatted: Indent: Left: 0", Hanging: 0.5" Deleted: 4.

Deleted: such as

Deleted: s

Deleted: 5.

Deleted: D4457-85

Deleted: Compliance with the prohibition of sale (S ubsection B.6) shall be determined by measuring the ROC content of each and every component of a coating or coating system which has been reduced using the manufacturer's recommended type and maximum amount

of reducer.

Deleted: 2.

Deleted: wash primers

Deleted: 85

Deleted: (modified)

Deleted: 3.

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 12 Coatings by Spectrographic Method) of the SCAQMD "Laboratory Method of Analysis for Enforcement Samples."

5. The presence of hexavalent chromium in a coating shall be determined using
ASTM Method D 3718-85a.

6. The presence of lead or cadmium in a coating shall be determined using ASTM
Method D 3335-85a.

7. Control and Capture Efficiency: The capture and control efficiency of emission control systems shall be determined as specified in U.S. EPA’s “Guidelines for Determining Capture Efficiency,” (January 9, 1995) and 40 CFR 51, Appendix M, Methods 204-204f as applicable. Tota l organic emissions of emission control systems shall be determined using EPA Method 25 or 25A. A source is in
violation if the measured overall TOC capture and control efficiency of the emission control system is less than 85 percent.

8. Transfer Efficiency: Spray equipment transfer efficiency shall be determined by using South Coast AQMD’s “Spray E quipment Transfer Efficiency Test Procedure for Equipment User,” (May 24, 1989).

9. HVLP Equivalency: Spray Equipment HVLP equivalency shall be determined by using South Coast AQMD’s “Guidelines for Demonstrating Equivalency with District Approved Transfer Efficient Spray Guns”(September 26, 2002).

10. Alternative Test Methods: The use of ot her test methods may be used in place of test methods specified in this rule if they are determined to be equivalent or better and approved, in writing, by the Air Pollution Control Officer, CARB and U.S.

EPA.

F. Violations

Failure to comply with any provision of this rule shall constitute a violation of this rule.

G. Definitions:

1. "Adhesion Promoter": Any coating, which is labeled and formulated to be applied to uncoated plastic surfaces to facilitate bonding of subsequent coatings, and on which a subsequent coating is applied. Deleted: 4. Transfer Efficiency shall

be determined in accordance with the South Coast Air Quality Management District method entitled "Spray Equipment Transfer Efficiency Test Procedure for Equipment Users" or a method which shall:¶ ¶

a. Be modeled after the test method

described in the EPA document (EPA/600/2-88/-26b) "Development of Proposed Standard Test Method for Spray Painting Transfer Efficiency."¶ ¶
b. Simulate the transfer efficiency achieved during the actual operations.¶ ¶

c. Have received written approval by the APCO.¶ ¶

Deleted: 6. ROC composite pressure of a solvent shall be calculated using a widely accepted published source such as: Boublik, T., V. Fried and E. Hala, "The Vapor Pressure of Pure Subs tances," Elsevier Scientific Publishing Co., New York (1973), Perry's Chemical Engineer's Handbook, McGraw-Hill Book Company, CRC Handbook of Chemistry and Physics, Chemical Rubber Publishing Company (1986-87), and Lange's Handbook of Chemistry, John A. Dean, editor, McGraw-Hill Book Company (1985). The true vapor pressure of a component in a solvent mix may be determined by ASTM Method D2879-86. The ROC composite pressure of a solvent mix consisting entirely of ROC may be determined by ASTM Method D2879-86. ¶

Deleted: 7. The active and passive solvent losses from spray gun cleaning systems shall be determined using South Coast Air Quality Management District's "General Test Method for Determining Solvent Losses from Spray Gun Cleaning Systems" dated October 3, 1989. The test solvent for this determination shall be any lacquer thinner with a minimum vapor pressure of 105 mm Hg at 20 o C. The

Deleted: 8.

Deleted: 9.

Deleted: 1. "Active Solvent Losses": The emissions during all steps of a spray gun equipment cleaning operation, expressed in units of grams of solvent loss per cleaning cycle.

Deleted: 2.

Deleted: A specialty coating formulated to be applied over an OEM topcoat or other hard finish as a midcoat prior to the application of a topcoat.

Deleted:

Deleted: 10/96 ... [1]Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 13 2. “Aerosol Coating Product”: Any pr essurized coating product containing pigments or resins that dispenses product ingredients by means of a propellant, and is packaged in a disposable can for hand-held application.

3. “Associated Parts and Components”: Structures, devices, pieces, modules, sections, assemblies, subassemblies, or elements of motor vehicles or mobile equipment which may or may not be attached to motor vehicles or mobile equipment at the time of coating the structure, device, piece, module, section, assembly, subassembly, or element. Associated parts and components do not
include circuit boards.

4. “Automotive Coating”: Any coating or coating component used or recommended for use in motor vehicle or mobile equipment coating, refinishing, service, maintenance, repair, restoration, or modi fication, except metal plating activities. Any reference to automotive refinishing or automotive coating made by a person on the container or in product literature constitutes a recomme ndation for use in motor vehicle or mobile equipment refinishing.

5. “Automotive Coating Component”: Any portion of a coating, including, but not limited to, a reducer or thinner, tone r, hardener, and additive, which is recommended by any person to distributors or end users for use in an automotive coating, or which is supplied for or used in an automotive coating. The raw materials used to produce the components are not considered automotive coating
components.

6. “CARB”: The abbreviation for the California Air Resources Board.

7. “Cleaning Operations”: The removal of uncured adhesives, inks or coatings, or contaminants, including but not limited to, dirt, soil, or grease, from motor vehicles, mobile equipment, associated parts and components, parts, products, tools, machinery, equipment, or general work areas. Cleaning operations include, but are not limited to, substrate surface preparation and spray gun cleaning and exclude janitorial cleaning.

8. “Clear Coating”: Any coating that co ntains no color-producing pigments and is labeled and formulated for applica tion over a color or clear coating.

9. "Coating": A material which is applied to a surface and forms a solid film in order to beautify, preserve, repair, or protect such a surface. Formatted: Indent: Left: 0", Hanging: 1" Deleted: 3. "Antiglare/Safety Coating": A coating formulated to eliminate glare for safety purposes on

interior surfaces of a vehicle and which

shows a reflectance of 25 or less on a 60 o gloss meter.

Deleted: 4. "Basecoat/Clearcoat System": A multistage topcoat system composed of a pigmented basecoat portion and two transparent clearcoat portions. Basecoat/c learcoat multistage topcoat systems' ROC content shall be calculated according to the following formula:¶ ¶

ROC bc + 2 ROC cc ¶

ROC T bc/cc = _________________¶ 3 ¶ Where:¶ ¶

ROC T bc/cc = the average of the sum of the ROC content as applied in the basecoat (bc) and clearcoat (cc) system.¶ ¶

ROC bc = the actual ROC content as applied of any given basecoat.¶ ¶

2 ROC cc = two times the actual ROC content as applied of any given clearcoat.¶ ¶

Deleted: 5. "Camouflage Coating": A coating applied on motor vehicles to conceal such vehicles from detection.¶

Deleted: 6. "Catalyst": A substance whose presence in itiates the reaction between chemical compounds.

Deleted: 7. "Cleanup": The removal of uncured coating from any surface. ¶ ¶

8. "Color Match": The ability of a repair coating to blend into an existing coating so that color difference is not

visible. ¶

Deleted: A liquid, liquefiable or mastic composition which is converted to a solid protective, decorativ e, or functional adherent film after application as a thin layer.

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 14 10. “Color Coating”: Any pigmented coating, excluding adhesion promoters, primers, and multi-color coatings, that re quires a subsequent clear coating and which is applied over a primer, adhesion promoter, or color coating. Color coatings include metallic/iridescent color coatings.

11. “Cured Coating, Cured Ink, or Cured Adhe sive”: is a coating, ink, or adhesive, which is dry to the touch.

12 . "Electrophoretic Dip": A coating applic ation method where the coating is applied by dipping the component into a coating bath and an electrical potential difference exists between the component and the bath.

13 . "Electrostatic Spray Application": Any method of spray application of coatings
where an electrostatic attraction is create d between the part to be coated and the paint particles.

14. “Emission Control System”: Any combination of capture systems and control devices used to reduce Total Orga nic Compound (TOC) emissions from automotive coating operations.

15. “EPA”: The abbreviation for the United States Environmental Protection Agency.

16 . "Exempt Organic Compounds": As defined in Rule 2 of these Rules , except that tert-butyl acetate shall be considered an exempt organic compound when determining compliance with this Rule

.

17 . "Grams of ROC per Liter of Coating Less Water and Exempt Organic Compounds" (VOC Regulatory) : The weight of ROC per combined volume of ROC and coating solids and can be calculated by the following equation:

Grams of ROC per Liter W s - W w - W es of Coating Less Water =

_____________ and Less Exempt Organic Compounds V m - V w - V es

Where: W s = Weight of volatile compounds (grams)

W w = Weight of water (grams)

W es = Weight of exempt organic compounds (grams)

V m = Volume of material (liters)

V w = Volume of water (liters)

V es = Volume of exempt organic compounds (liters)

18 . "Grams of ROC per Liter of Material" (VOC Actual) : The weight of ROC per volume of material and can be calculated by the following equation: Formatted: Indent: Left: 0", Hanging: 1" Deleted: 10

Deleted: 11

Deleted: A sufficient charging of atomized paint droplets to cause deposition principally by electrostatic attraction. This application shall be operated at a minimum of 60 KV power.

Deleted: 12

Deleted: 13

Deleted: 14

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 15 Grams of ROC per Liter W s - W w - W es of Material =

_____________ V m

Where: W s = Weight of volatile compounds (grams)

W w = Weight of water (grams)

W es = Weight of exempt organic compounds (grams)

V m = Volume of material (liters)

19. "High-Volume, Low-Pressure Application (HVLP)": Equipment used to apply coatings by means of a spray gun designe d to be operated and operated between 0.1 and 10 psig air pressure measured dynamically at the center of the air cap and
at the air horns.

20. "Immobilized": A vehicle is immobilized or incapable of being moved, only when an engine or wheel has been removed so that the engine or wheel compartments can be coated.

21. "Interior Motor Vehicle Part": Any inte rior part of the motor vehicle, including but not limited to the engine, engine compartment, wheel well, suspension component or passenger compartment, that is not a "major panel" or exterior motor vehicle panel.

22. “Janitorial Cleaning”: The cleaning of building or facility components including, but not limited to, floors, ceilings, wa lls, windows, doors, stairs, bathrooms, furnishings, and exterior of office equipment, and excludes the cleaning of work areas, where manufacturing, coating, or repair activity is performed.

23 . "Major Panel": Any exterior motor ve hicle panel including but not limited to the roof, hood, doors, quarter panel, fender, bumper, soft bumper cover, deck lid, luggage lid, rear body panel, cowl top panel, rocker panel, and front header panel.

24 . "Metallic/Iridescent Topcoat": Any topcoa t which contains more than 5 g/l (.042 lb/gal) of iridescent particles, composed of metal as metallic particles or silicon as mica particles, as applied, where such particles are visible in the dried film.

25. “Mobile Automotive Coating Touch-Up Operations:” A portable automotive coating operation that is limited to small re pair jobs where application of coatings may only be performed with a paint brush or an air brush with a cup that holds no more than 4 ounces of paint. Formatted: Indent: Left: 0", Hanging: 1" Formatted: Indent: Left: 0", Hanging: 1" Deleted: 15. "Group I Vehicles": These include passenger cars, large/heavy duty truck cabs and chassis, light and medium duty trucks and vans, and motorcycles.¶ ¶

16. "Group II Vehicles/Equipment": These include public transit buses, mobile equipment, or military tanks or other tracked military vehicles.¶

Deleted: 17. "Gun Washer": Electrically or pneumatically operated system that is designed to clean spray application equipment while enclosed. A gun washer may also be considered a gun cleaning system that consists of spraying solvent into an enclosed container using a snug fitting. ¶

Deleted: 18. "Hand Application Methods": The application of coatings by nonmechanical hand-held equipment including but not limited to paint brushes, hand rollers, caulking guns, trowels, spatulas, syringe daubers, rags, and

sponges.

Deleted: Spray equipment which uses a high volume of air delivered at pressures between 0.1 and 10 psig measured at the spray gun air cap and which operates at a maximum fluid delivery pressure of 50 psig

Deleted: 22. "Large Production/Utility Bodies": The production of utility bodies at a rate greater than 20 vehicles per day.¶ ¶

Deleted: 25

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 16 26 . "Mobile Equipment": Any equipment which may be drawn or is capable of being
driven on rails or a roadway, including, but not limited to, trains, railcars, truck bodies, truck trailers, camper shells, mobile cranes, forklifts, bulldozers, tractors, concrete mixers, street cleaners, golf carts, all terrain vehicles, implements of husbandry. and hauling equipment used insi de and around airports, docks, depots, and industrial and commercial plants, utility bodies , or implements of husbandry or agriculture

.

27 . "Motor Vehicle": A vehi cle which is self-propelled vehicle, including but not limited to, cars, trucks, buses, golf cart s, vans, motorcycles, tanks, or armored personnel carriers.

.

28. “Multi-Color Coating”: Any coating that exhibits more than one color in the dried film after a single application, is packaged in a single container, and hides surface defects on areas of heavy us e, and which is applied over a primer or adhesion promoter.

29 . "Prep Station": Any spraying area that meets the requirements for a "Limited Spraying Area" from Section 45.207 of the Uniform Fire Code and that prevents the escape to the atmosphere of overspra y particulate using properly maintained filters and positive mechanical ventilation.

30 . "Pretreatment Coating ": Any coating which contains a minimum of 0.5% acid, by weight, and not more than 16% solids by weight, and is necessary to provide surface etching and is labeled and formulated for application directly to bare metal surfaces to provide corro sion resistance and adhesion.

31 . "Primer": Any coating, which is labeled a nd formulated for application to a substrate to provide 1) a bond between th e substrate and subsequent coats, 2) corrosion resistance, 3) a smooth substrate surface, or 4) resistance to penetration of subsequent coats, and on which a subs equent coating is applied. Primers may be pigmented.

32 . "Primer Sealer": Any coating , which is labeled and formulated for application prior to the application of a color coating for the purpose of color uniformity, or to promote the ability of an undercoat to resist penetration by the color coating

.

33 . "Reactive Organic Compound (ROC)": As defined in Rule 2 of these rules. The term "volatile organic compound" (VOC) is equivalent to ROC. Deleted: 26

Deleted: but excluding

Deleted: 27

Deleted: and which is physically capable of being driven on a highway

Deleted: 28. "Multistage Topcoat": A topcoat system which consists of a basecoat/clear coat system (2 stage) or

basecoat/midco at/clear coat system (3 stage).¶ ¶

Deleted: 29. "Operating Cycle": An operating cycle consists of all steps carried out during a cleaning operation.

Deleted: 30. "Passive Solvent Losses": The passive solvent losses are the emissions from spray gun cleaning equipment when the equipment sits idle between cleaning cycles and are a result of natural evaporation from the equipment.

Deleted: 31

Deleted: 32

Deleted: Wash Primer

Deleted: applied

Deleted: 33

Deleted: Any coating applied prior to the application of a topcoat for the purpose of corrosion resistance and adhesion of the topcoat.

Deleted: 34

Deleted: applied

Deleted: topcoat

Deleted: adhesion of the topcoat,

Deleted: and

Deleted: topcoat

Deleted: 35. "Primer Surfacer": Any coating applied prior to the application of a topcoat for the purpose of corrosion resistance, adhesion of the topcoat, and which promotes a uniform surface by filling in surface imperfections.

Deleted: 36. ROC Composite Partial Pressure": The sum of the partial pressures of the compounds defined as ROCs. ROC composite partial pressure is calculated as follows:¶ ¶

Deleted: 37

Deleted:

Deleted: 10/96 ... [2]Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 17 34 . "Reducer": Any volatile liquid used to re duce the viscosity of the coating. This liquid may be solvents, diluents or mixtures of both.

35. “Single-Stage Coating”: Any pigmented coating, excluding primers and multicolor coatings, labeled and formulated for application, without a subsequent clear coat. Single-stage coatings include both single-stage metallic/iridescent coatings and single-stage nonmetallic or non-iridescent coatings.

36. “Solvent”: An ROC-containing materi al used to perform cleaning operations.

37. “Spot Repair”: The repair of an area on a motor vehicle, piece of mobile equipment, or associated parts or components of less than 1 square foot.

38 . "Spray Booth": Any power ventilated structure of varying dimensions and construction provided to enclose or ac commodate a spraying operation and which meets the Uniform Fire Code. A spray booth shall confine and limit, by dry or wet filtration, the escape to the atmosphere of overspray particulate matter.

39. “Temporary Protective Coating”: Any co ating which is labeled and formulated for the purpose of temporarily protecti ng areas from overspray or mechanical damage.

40 . "Transfer Efficiency": The ratio of the weight of coating solids which adhere to the object being coated to the weight amount of coating solids used in the application process, expr essed as a percentage.

41. “Truck Bed Liner Coating”: Any coating, excluding clear, color, mult-color, and single stage coatings, labeled and formulated for application to a truck bed to protect it from surface abrasion.

42. “Underbody Coating” Any coating labele d and formulated for the application to wheel wells, the inside of door panels or fenders, the underside of a trunk or hood,
or the underside of the motor vehicle.

43. “Uniform Finish Coating”: Any coating labeled and formulated for application to the area around a spot repair for the purpose of blending a repaired area’s color or clear coat to match the appearance of an adjacent area’s existing coating.

44. “VOC”: The term “volatile organic compound” or VOC is equivalent to ROC. Formatted: Indent: Left: 0", Hanging: 1" Deleted: 38

Deleted: 39. "Small Production/Utility Bodies": The production of utility bodies at a rate of 20 vehicles per day or less.¶ ¶

Deleted: 40. "Specialty Coatings": Coatings which are necessary due to unusual and uncommon job performance requirements. These coatings include, but are not limited to, weld-thru primers, adhesion promoters, uniform finish blenders, elastomeric materials, gloss flatteners, bright metal trim repair, antiglare/safety coatings, impact resistant coatings, rubberized asphaltic underbody coatings, water hold-out coatings, and multicolor coatings that exhibit more than one color when applied from a single

container.

Deleted: 41

Deleted: 42. "Three-Stage Coating System": A multistage topcoat system composed of a pigmented basecoat portion, a semi-transparent midcoat portion, and two transparent clearcoat portions. Three-stage coating systems'
ROC content shall be calculated according to the fo llowing formula:¶

ROC bc + ROC mc + 2 ROC cc ¶

ROC T 3-stage =

_______________________ ¶

4¶ Where:¶

ROC T 3-stage = the average of the ROC content as applie d in the basecoat (bc), midcoat (mc), and clearcoat (cc) system.¶

ROC bc = the ROC content as applied in the basecoat.¶

ROC mc = the ROC content as applied of any given midcoat.¶

2 ROC cc = two times the ROC content as applied of any given clearcoat.

Deleted: 43. "Topcoat": Any coating applied over a primer or an original OEM finish for the purpose of protection or appearance. For the purposes of this rule, either a basecoat/clearcoat system or 3- stage coating system shall be considered jointly as a topcoat.

Deleted: 44

Deleted:

Deleted: 10/96Nov. 11, 2008 Proposed Amended Rule ATTACHMENT 3 Rule 74.18 : 18 45. “VOC Actual for Coatings”: This means the same as “Grams of ROC per Liter of Material,” which does not involve subt raction of water or exempt organic compounds as is performed in the VOC regulatory calculation.

46. “VOC Regulatory for Coatings”: This means the same as “Grams of ROC per Liter of Coating Less Water and Exempt Organic Compounds.” VOC and ROC have the same meaning.

47. “Water-Reducible Electrophoretic Brake Component Coating”: Any coating that is applied to vehicle brakes or brake components via an electrophoretic dip coating process in an aqueous solution.

48. "Weld-Thru Primer": Any primer applied from an aerosol can, 16 ounces or less, to bare steel prior to welding that steel area. The purpose of the weld-thru primer
is to inhibit corrosion in the weld area. Deleted: ¶

Deleted: 45. "Undercoat": Any pretreatment wash primer, primer, primer surfacer, or primer sealer.¶

Deleted: 46. "Utility Body": A special purpose compartment or unit that will be bolted, welded, or affixed onto an existing cab and chassis. The compartment may serve as storage for equipment of parts.¶ ¶

Deleted: 47. "Water-Based Temporary Transit Coating": Any water-based coating that is inte nded to protect new

motor vehicle finishes from certain forms of damage such as iron dust, soot, acid rain, and other airborne pollutants during transit and is removed prior to sale of the

vehicle.

Deleted:

Deleted: 10/96Page 12: [1] Deleted Stan Cowen 9/11/2007 8:22:00 AM 

### 7. The active and passive solvent losses from spray gun cleaning systems shall be determined using South Coast Air Quality Management District's "General Test Method for Determining Solvent Losses from Spray Gun Cleaning Systems" dated October 3, 1989. The test solvent for this determination shall be any lacquer thinner with a minimum vapor pressure of 105 mm Hg at 20 o C. The minimum test temperature shall be 15 o C.

Page 16: [2] Deleted Stan Cowen 2/27/2007 3:24:00 PM 

### 36. ROC Composite Partial Pressure": The sum of the partial pressures of the compounds defined as ROCs. ROC composite partial pressure is
calculated as follows:



# ( ) ( ) ( )

PP W VP

MW

W

MW W

MW W

MW c i i

i i n

w

w e

e e n i

i i n =       +       +       =

= = 

# ∑ ∑ ∑ 1

1 1



### Where:

W i = Weight of the "i"th ROC compound, in grams

W w = Weight of water, in grams

W e = Weight of the "e"th exempt organic compound, in grams

MW i = Molecular weight of the "i"th ROC compound, in g/(g-mole)

MW w = Molecular weight of water, in g/(g-mole)

MW e = Molecular weight of the "e"th exempt compound, in g/(g-mole)

PP c = ROC composite partial pressure at 20 C, in mm Hg

VP i = Vapor pressure of the "i"th ROC compound at 20 C, in mm Hg.