Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 1 RULE 2.31 SOLVENT CLEANING AND DEGREASING

ADOPTED April 27, 1994
REVISED August 13, 1997

REVISED May 14, 2008
REVISED May 8, 2013

INDEX

100 GENERAL
101 PURPOSE
102 APPLICABILITY
110 EXEMPTION - GENERAL 111 EXEMPTION - SOLVENT REQUIREMENTS
112 EXEMPTION - GENERAL PROHIBITIONS
113 EXEMPTION - LIMITED AEROSOL
114 EXEMPTIONS - AEROSPACE VEHICLE OR COMPONENTS

200 DEFINITIONS
201 AEROSOL PRODUCT
202 AEROSPACE VEHICLE OR COMPONENTS
203 AIRLESS CLEANING SYSTEM
204 AIRTIGHT CLEANING SYSTEM
205 AIR SOLVENT INTERFACE 206 APPLICATION EQUIPMENT
207 APPURTENANCES
208 ARCHITECTURAL COATINGS 209 AQUEOUS CLEANING SOLVENT
210 BATCH CLEANING MACHINE
211 COLD CLEANING MACHINE
212 CONTROL DEVICE 213 CURED COATINGS, CURED INKS, AND CURED ADHESIVES
214 DEGREASER
215 DOCTOR BLADE
216 ELECTRICAL APPARATUS COMPONENT
217 ELECTRONIC COMPONENT
218 EMISSION CONTROL SYSTEM
219 EXEMPT COMPOUNDS
220 FACILITY
221 FLEXOGRAPHIC PRINTING
222 FREEBOARD HEIGHT
223 FREEBOARD RATIO
224 GENERAL WORK SURFACES
225 GRAPHIC ARTS
226 GRAVURE PRINTING
227 HIGH PRECISION OPTICS
228 INTAGLIO PRINTING
229 JANITORIAL CLEANING
230 LETTERPRESS PRINTING
231 LITHOGRAPHIC PRINTING 232 LIQUID LEAKYolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 2 233 MAINTENANCE CLEANING
234 MANUFACTURING PROCESS
235 MEDICAL DEVICE
236 NON-ABSORBENT CONTAINERS
237 NON-ATOMIZED SOLVENT FLOW
238 NON-LEAKING CONTAINERS
239 OPEN TOP VAPOR DEGREASER
240 PHARMACEUTICAL MANUFACTURING PLANT
241 PHARMACEUTICAL PRODUCT
242 PRINTING
243 PRODUCT CLEANING
244 REMOTE RESERVOIR COLD CLEANER
245 REPAIR CLEANING
246 REPAIR PROCESS
247 SCREEN PRINTING 248 SEMIAQUEOUS CLEANING SOLVENT
249 SOLVENT
250 SOLVENT CLEANING MACHINE
251 SOLVENT CLEANING OPERATION
252 SOLVENT CONTAINER
253 SOLVENT DEGREA SING OPERATION
254 SOLVENT FLUSHING
255 STRIPPING
256 SURFACE PREPARATION AND CLEANUP
257 ULTRAVIOLET INKS
258 VAPOR CLEANING MACHINE 259 VOLATILE ORGANIC COMPOUND (VOC) 260 VOLATILE ORGANIC COMPOUND (VOC) COMPOSITE PARTIAL PRESSURE 261 VOLATILE ORGANIC COMPOUND (VOC) CONTENT

262 WIPE CLEANING

300 STANDARDS

301 SOLVENT CLEANING OPERATIONS
302 SOLVENT DEGREASING OPERATIONS 303 –COLD CLEANER REQUIREMENTS 304 OPEN TOP VAPOR DEGREASER REQUIREMENTS 305 AIRLESS/AIRTIGHT CLEANING SYSTEM REQUIREMENTS 306 REMOTE RESERVOIR COLD CLEANER REQUIREMENTS
307 STORAGE AND DISPOSAL - GENERAL
308 EMISSION CONTROL SYSTEM

400 ADMINISTRATIVE REQUIREMENTS

401 PROHIBITION OF SPECIFICATION 402 COMPLIANCE STATEMENT REQUIREMENT 403 OPERATION & MAINTENANCE PLAN (O&M PLAN)

500 MONITORING AND RECORDS
501 RECORD KEEPING - GENERAL
502 TEST METHODS RECORD KEEPING - EMISSION CONTROL SYSTEM
503 BURDEN OF PROOF
504 RECORD RETENTIONYolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 3 600 TEST METHODS AND CALCULATIONS

601 GENERAL
602 VOC CONTENT
603 EXEMPT COMPOUNDS
604 CALCULATION OF VOC CONTENT
605 CALCULATION OF VOC COMPOSITE PARTIAL PRESSURE
606 CAPTURE EFFICIENCY
607 CONTROL EFFICIENCY
608 SPRAY GUN CLEANING SYSTEMSYolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 4 100 GENERAL

101 PURPOSE: The purpose of this Rule is to limit the emissions of volatile organic compounds (VOC) from solvent cleaning opera tions and solvent degreasing operations, and from the storage and disposal of materials used for such operations.

102 APPLICABILITY: The provisions of this Rule applies to any owner or operator of any facility that uses VOC-containing materials fo r solvent cleaning or solvent degreasing, or any person who sells or distributes any solvent subject to the provisions of this rule.

110 EXEMPTION - GENERAL: The provisions of this rule, except for Section 503, Burden of Proof, shall not apply to the following:

110.1 Dry cleaning operations.

110.2 Cleaning operations using a solvent containing no more than 25 grams of VOC per
liter of material.

110.3 Janitorial cleaning.

110.4 Stripping of cured coatings, cured adhesives, and cured inks.

110.5 Degreasers with an open top surface area of 1.0 square foot or less or with a capacity of 1.0 gallons or less, using unhe ated nonhalogenated solvent exclusively, where the reservoir is covered when not processing work.

110.6 Any solvent degreasing operations that are subject to the NESHAP requirements of 40 CFR Part 63 Subpart T- Nationa l Emission Standards for Halogenated Solvent Cleaning.

110.7 Cleaning operations in printing pre-press or graphic arts pre-press areas, including the cleaning of film processors, color scanners, plate processors, film cleaning, and plate cleaning.

111 EXEMPTION - SOLVENT REQUIREMENTS: The provisions of Section 301 shall not apply to any of the following applications, provided that the facility has obtained either a District permit, or written exemption from the APCO:

111.1 Wipe cleaning of solar cells, laser hardware, and high precision optics.

111.2 Wipe cleaning for performance laboratory tests on coatings, adhesives or inks, research and development programs, and laboratory tests in quality assurance
laboratories.

111.3 Wipe cleaning of polycarbonate plastics.

111.4 Cleaning of cotton swabs to remove cottonseed oil before cleaning of high precision optics.Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 5 111.5 Facilities using 10 gallons or less of solvents (total of compliant and noncompliant) in any one calendar year provided the daily use does not exceed one liter in any one day.

111.6 Cleaning of paper-based gaskets, and cl utch assemblies where rubber is bonded to metal by means of an adhesive.

111.7 Cleaning of sterilization ink indicating equipment provided that the solvent usage is less than 1.5 gallons per day.

111.8 Cleaning of coating and adhesive a pplication processes utilized to manufacture transdermal drug delivery pr oduct using less than 3.0 gallons per day of ethyl acetate, averaged over a calendar month period.

112 EXEMPTION - GENERAL PROHIBITION: The provisions of Section 301.4 shall not apply to any of the following applications:

112.1 Internal cleaning of the tips of auto mated spray equipment systems, except for robotic systems.

112.2 Spray bottles or containers described in Section 301.2.b. of this rule.

112.3 Printing operations where the roller or blanket wash is applied automatically.

113 EXEMPTION - LIMITED AEROSOL: The provisions of Sections 301 shall not apply to cleaning with aerosol products if 160 ounces or less are used per day per facility and the facility has obtained either a District perm it, or a written exemption from the APCO. The products used shall comply with California Air Resources Board (ARB) regulations.

114 EXEMPTIONS – AEROSPACE VEHICLE OR COMPONENTS:

114.1 The provisions of section 307 shall not appl y to cotton-tipped swabs used for very small cleaning operations nor to aqueous cleaning solvents.

114.2 The provisions of section 301 sh all not apply to the following: a. Cleaning during the manufacture, assembly, installation, maintenance, or testing of components of breathing oxygen systems that are exposed to the breathing oxygen; b. Cleaning during the manufacture, assembly, installation, maintenance, or testing of parts, subassemblies, or assemblies that are exposed to strong oxidizers or reducers (e.g., nitrogen tetroxide, liquid oxygen, hydrazine); c. Cleaning and surface activation prior to adhesive bonding; d. Cleaning of electronics and assemblies containing electronics; e. Cleaning of aircraft and ground sup port equipment fluid systems that are exposed to the fluid, including air-t o-air heat exchangers and hydraulic fluid systems; f. Cleaning of fuel cells, fuel tanks, and confined spaces; g. Surface cleaning of solar cells, coated optics, and thermal control surfaces; h. Cleaning during fabrication, assembly , installation, and maintenance of upholstery, curtains, carpet, and other textile materials used on the interior of the aircraft;Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 6 i. Cleaning of metallic and nonmetallic materials used in honeycomb cores during the manufacture or maintenance of these cores, an d cleaning of the completed cores used in the manufacture of aerospace vehicles or
components; j. Cleaning of aircraft transparencies, polycarbonate, or glass substrates; k. Cleaning and solvent usage associated with r esearch and development, quality control, or laboratory testing; l. Cleaning operations using nonflammabl e liquids conducted within 5 feet of energized electrical systems. En ergized 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; and m. Cleaning operations identified in essential uses Montreal Protocol for
which the Administrator has allocated essential use allowance exemptions
in 40 CFR 82.4.

114.3 The provisions of section 301.2. c and 301.2.d. shall not appl y to semiaqueous or aqueous cleaning solvents.

200 DEFINITIONS

201 AEROSOL PRODUCT: A hand-held, non-refillable cont ainer which expels pressurized product ingredients by means of a manual propellant-induced force.

202 AEROSPACE VEHICLE OR COMPONENTS: 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 airpla nes, helicopters, missiles, rockets, and space
vehicles.

203 AIRLESS CLEANING SYSTEM: A degreaser that is automatically operated and seals at an absolute internal pressure of 0.02 psia or less, prior to the introduction of solvent vapor into the cleaning chamber, and mainta ins differential pressure under vacuum during all cleaning and drying cycles.

204 AIRTIGHT CLEANING SYSTEM: A degreaser that is automatically operated and seals at a differential pressure no greater than 0.5 ps ig during all cleaning and drying operations.

205 AIR SOLVENT INTERFACE: The point of contact between the exposed solvent and
air.

206 APPLICATION EQUIPMENT: A device used to apply adhesive, coating, ink, or polyester resin material, such as but not limited to brushes, rollers and spray guns.

207 APPURTENANCES : Accessories to an architectural structure, including, but not limited to: Hand railings, cabinets, bathroom and k itchen fixtures, fences, rain-gutters and down-spouts, window screens, lamp-posts, hea ting and air conditioning equipment, other mechanical equipment, large fixed st ationary tools and concrete forms.

208 ARCHITECTURAL COATINGS : Any coatings applied to stationary structures and their appurtenances, to mobile homes, to pavements, or to curbs.Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 7 209 AQUEOUS CLEANING SOLVENT: A solvent in which water is at least 80 percent of the solvent as applied.

210 BATCH CLEANING MACHINE: A solvent cleaning machine in which individual parts or a set of parts move through the entire clean ing cycle before new parts are introduced into the solvent cleaning machine. An open-top vapor cleaning machine is a type of batch cleaning machine. A solvent cleaning machin e, such as a ferris wheel or a cross-rod degreaser, that clean multiple batch loads simultaneously and are manually loaded are batch cleaning machines.

211 COLD CLEANING MACHINE: Any device or piece of equipment that contains and/or uses liquid solvent, into which parts are placed to remove soils from the surfaces of the parts or to dry the parts. Cleaning machines that contain and use heated, nonboiling solvent to clean the parts are clas sified as cold cleaning machines.

212 CONTROL DEVICE: Equipment such as an incinerator or adsorber used to prevent air pollutants from reaching the ambient air.

213 CURED COATINGS, CURED INKS, AND CURED ADHESIVES : Coatings, inks, and adhesives which are dry to the touch.

214 DEGREASER: A tank, tray, drum, or other container in which objects to be cleaned are placed in to be exposed to a so lvent or solvent vapor, in order to remove contaminants. The objects to be cleaned include, but are not limited to, parts, products, tools, machinery, and equipment.

215 DOCTOR BLADE: A blade used to scrape excess ink from a printing plate.

216 ELECTRICAL APPARATUS COMPONENT: An internal component such as wires, windings, stators, rotors, magnets, contacts, relays, energizers, and connections in an apparatus that generates or transmits elect rical energy including, but not limited to: alternators, generators, transformers, electri c motors, cables, and circuit breakers, except for the actual cabinet in which the components are housed. Electrical components of graphic arts application equipment and hot-lin e tools are also included in this category.

217 ELECTRONIC COMPONENT: The portion of an assembly, including circuit card assemblies, printed wire assemblies, printed circ uit boards, soldered joints, ground wires, bus bars, and other electrical fixtures, ex cept for the actual cabinet in which the components are housed.

218 EMISSION CONTROL SYSTEM: A control device and its associated collection
system.

219 EXEMPT COMPOUNDS: As defined in Rule 1.1, Gene ral Provisions and Definitions.

220 FACILITY: A business or businesses engaged in surface preparation and clean up activities which are owned or operated by th e same person or persons and are located on the same or contiguous parcels.Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 8 221 FLEXOGRAPHIC PRINTING : A letterpress method utilizing flexible rubber or other elastomeric plate and rapid drying liquid inks.

222 FREEBOARD HEIGHT: The distance from the top of the solvent or solven t drain to the top of the tank for batch loaded cold cleaners.

223 FREEBOARD RATIO: The freeboard height divided by the width of the degreaser.

224 GENERAL WORK SURFACE: An area of a medical device or pharmaceutical facility where solvent cleaning is performed on work surfaces including, but not limited to, tables, countertops, and laboratory benches. General wo rk surfaces shall not include items defined under janitorial cleaning.

225 GRAPHIC ARTS: All screen, gravure, letterpress, flexographic, and lithographic printing processes.

226 GRAVURE PRINTING: An intaglio printing process in which the ink is carried in minute etched or engraved wells on a roll or cylinder. The excess ink is removed from the surface by a doctor blade.

227 HIGH PRECISION OPTICS: An optical element used in an electro-optical device that is designed to sense, detect, or transmit light energy, including specific wavelengths of light energy and changes in light energy levels.

228 INTAGLIO PRINTING: A printing operation done from a plate in which the image is etched or engraved into the surface.

229 JANITORIAL CLEANING: The cleaning of building or facility components, such as the floor, ceiling, walls, windows, doors, stairs, ba throoms, furnishings, and exterior surfaces of office equipment. The cleaning of work ar eas where manufacturing or repair activity is performed is excluded from this definition.

230 LETTERPRESS PRINTING: The method in which the image area is raised relative to the nonimage area and the ink is transferred to the paper directly from the image surface.

231 LITHOGRAPHIC PRINTING: A printing operation in which the image and non-image areas exist in the same plane. The non-image area is treated chemically so that only the image area will be printed onto the substrate.

232 LIQUID LEAK: A visible liquid solvent leak from a container at a rate of more than three (3) drops per minute, or a visible liquid mist.

233 MAINTENANCE CLEANING: Surface preparation and cleanup, including sanitization, carried out to keep parts, products, tools, ma chinery, equipment, or general work areas in clean and good opera tional condition.

234 MANUFACTURING PROCESS: The process of making goods or articles by hand or by machinery.Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 9 235 MEDICAL DEVICE: Any instrument, apparatus, implement, machine contrivance, implant, in vitro reagent or other similar article, including any component or accessory, that meets one of the following conditions:

235.1 It is intended for use in the diagnosis of disease or other conditions, or in the cure, mitigation, treatment, or prevention of disease: or

235.2 It is intended to affect the structure or any function of the body; or

235.3 It is defined in the National Formulary or the United States Pharmacopia, or any supplement to them.

236 NON-ABSORBENT CONTAINERS: Containers made of nonporous material which do not allow the migration of the liquid solvent through them.

237 NON-ATOMIZED SOLVENT FLOW: The use of a solvent to remove uncured adhesives, uncured inks, uncured coatings, and contaminants from an article in the form of a liquid stream without atomization.

238 NON-LEAKING CONTAINERS: Containers without liquid leaks.

239 OPEN TOP VAPOR DEGREASER: A batch solvent cleaning machine that has its upper surface open to the air and boils solvent to cr eate solvent vapor used to clean and/or dry
parts.

240 PHARMACEUTICAL MANUFACTURING PLANT: Any plant producing or blending chemicals for use in pharmaceuti cal products and/or employing chemical processes in the manufacture of pharmaceutical products or medical devices. Any facility or operation that has 283 as the first three di gits of their Standard Industrial Classification Code. Pharmaceutical manufacturing plants may include, but are not limited to, establishments primarily engaged in manufactur ing, fabricating, or processing medicinal chemicals and pharmaceutical products for human or veterinary use.

241 PHARMACEUTICAL PRODUCT: A preparation or compound of medicinal drugs including, but not limited to, a prescription drug , analgesic, decongestant, antihistamine, cough suppressant, vitamin, mineral and herb, and is used by humans for consumption to
enhance human health.

242 PRINTING: Any operation in the graphic arts that imparts color, design, alphabet, or
numerals on a substrate.

243 PRODUCT CLEANING: The removal of loosely held uncured adhesives, uncured inks, uncured coatings, and contaminants such as dus t, soil, oil, grease, etc., from the product or substrate during any manufacturing process, adh esive application, coating application or ink application.

244 REMOTE RESERVOIR COLD CLEANER: A cleaning device, such as a parts washer, in which liquid solvent is pumped from a solv ent container to a sink-like work area and the
solvent from the sink-like area drains into an enclosed solvent container while parts are being cleaned.Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 10 245 REPAIR CLEANING: Surface preparation and cleanup carried out during a repair

process.

246 REPAIR PROCESS: The process of returning a damaged object or an object not operating properly to good condition.

247 SCREEN PRINTING: A process in which the printing ink passes through a web or fabric
to which a refined form of stencil has been applied. The stencil openings determine the form and dimensions of the imprint.

248 SEMIAQUEOUS CLEANING SOLVENT: A solution in which water is a primary ingredient ( ≥ 60 percent of the solvent solution as applied must be water).

249 SOLVENT: Any liquid containing a volatile organi c compound or combination of volatile organic compounds, which is used to as a dilu ent, thinner, dissolver, viscosity reducer, cleaning agent, or for other similar uses.

250 SOLVENT CLEANING MACHINE: Any device or piece of equipment that uses solvent liquid or vapor to remove soils from the surfaces of materials. Types of solvent cleaning machines include, but are not limited to, batch vapor, in-line vapor, in-line cold, and batch cold solvent cleaning machines. Buck ets, pails, and beakers with capacities of 7.6 liters (2 gallons) or less are not considered solvent cleaning machines.

251 SOLVENT CLEANING OPERATION: A 

### n activity, or operation, or process, (including surface preparation, cleanup, or wipe cleaning), performed outside of a degreaser, that uses organic solvent to remove uncured adhesives, uncured coatings, uncured inks or other contaminants, including, but not limited to, dirt, soil, oil, lubricants, coolants, moisture, fingerprints, and grease, from parts, products, tools, machinery, application equipment and general work areas. Cleaning spray equipment used for the application of coatings, adhesives, or inks, is also considered to be solvent cleaning.

252 SOLVENT CONTAINER: That part of a cleaning device that holds the solvent.

253 SOLVENT DEGREASING OPERATION: A 

### ny cleaning activities which occur within a degreaser. Cleaning of ink, coating, or adhesive application equipment, and stripping of coatings are not considered solvent degreasing operations. Solvent degreasing operations and solvent cleaning operations are mutually exclusive.

254 SOLVENT FLUSHING: The use of solvent to remove uncured adhesives, uncured inks, uncured coatings, or contaminants from the internal surfaces and passages of the equipment by flushing solvent through the equipment.

255 STRIPPING : The removal of cured inks, cured adhesives, and cured coatings.

256 SURFACE PREPARATION AND CLEANUP: The removal of loosely held uncured adhesives, uncured inks, uncured coatings, and contaminants such as dust, soil, oil, grease, etc., at any step in the production, repair, ma intenance, or servicing of parts, products,Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 11 tools, machinery, equipment, or general work areas including the storage and disposal of VOC containing materials used.

257 ULTRAVIOLET INKS: Inks which dry by a polymerization reaction induced by
ultraviolet radiation.

258 VAPOR CLEANING MACHINE: A batch or in-line solvent cleaning machine that boils liquid solvent generating solvent vapor that is used as a part of the cleaning or drying cycle.

259 VOLATILE ORGANIC COMPOUND (VOC): As defined in Rule 1.1, General Requirements.

260 VOLATILE ORGANIC COMPOUND (VOC) COMPOSITE PARTIAL
PRESSURE: The sum of the partial pressures of the compounds defined as VOCs. VOC composite partial pressure is cal culated according to Section 605.

261 VOLATILE ORGANIC COMPOUND (VOC) CONTENT: The weight of VOC per volume of material as calculated pursuant to the applicable Sections of 600.

262 WIPE CLEANING: The method of cleaning a surface by physically rubbing it with a material such as a rag, paper, or a cotton swab moistened with a solvent.

300 STANDARDS

301 SOLVENT CLEANING OPERATIONS: Any person performing solvent cleaning operations shall comply with all the following:

301.1 VOC CONTENT LIMITS: A person shall not use a solvent, or specify or require any person to use a solvent subject to the provisions of this Rule, unless the solvent complies with the applicable requirements set forth in Table 1.Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 12 TABLE 1. VOC CONTENT LIMITS

Category VOC Content* Limit grams/liter (g/L)

Product Cleaning Electrical Apparatus Components & Electronic Components 100

Medical Devices and Pharmaceuticals 800

Aerospace Vehicle or Component 200 g/L or 45 mmHg

All other 25

Repair Cleaning &
Maintenance

Cleaning General 25 Electrical Apparatus Components & Electronic Components 100

Aerospace Vehicle or Component 200 g/L or 45 mmHg

Medical Devices and
Pharmaceuticals Tools, Equipment, Machinery 800

General Work Surfaces 600

Cleaning of Application Equipment Printing operations Screen Printing 100

Lithographic and Letterpress 238 Ultraviolet (except screen printing) 238 Specialty Flexographic 100 Gravure (Publication) 100

General 25

Medical Devices and Pharmaceuticals 810

Aerospace Vehicle or Component 200 g/L or 45 mmHg

All other 25

General Industries Not Specified Above 25
* For aerospace vehicle or components, the solvent mu st comply with either the VOC Content limit in grams/Liter (g/L) or the VOC Composite Partial Pressure limit in millimeters mercury (mmHg)

301.2 CLEANING METHODS: A person using a solvent above 25 grams/liter (in one of the above allowed categories) shall us e one of the following cleaning devices or
methods:

a. Wipe cleaning; b. Spray bottles or closed containers with a maximum capacity of 16 fluid ounces from which solvents are applied without a propellant induced force; c. Non-atomized solvent flow method where the cleaning solvent is
collected in a container or a collecti on system which is closed except for solvent collection openings and, if necessary, openings to avoid excessive pressure build-up inside the container; or d. Solvent flushing method where the cleaning solvent is discharged into a container which is closed except for solvent collection openings and, if necessary, openings to avoid excessi ve pressure build-up inside theYolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 13 container. The discharged solvent from the equipment must be collected into containers without atomizing into the open air. The solvent may be flushed through the system by air or hydraulic pressure, or by pumping.

301.3 APPLICATION EQUIPMENT CLEANUP: A person shall not use solvent to clean application equipment unless an encl osed system (or equipment that is proven to be equally effective at controlli ng emissions) is used for cleaning. If an enclosed system is used, it must totally enclose spray guns, cups, nozzles, bowls, and other parts during washing, rinsing and draining procedures, it must be used according to the manufacturer’s recommendati ons, and it must be closed when not
in use.

301.4 GENERAL PROHIBITION: A person shall not atomize any solvent into the open air.

302 SOLVENT DEGREASING OPERATIONS: Any person performing solvent degreasing operations shall comply with all of the following:

302.1 GENERAL REQUIREMENTS:

a. An operator shall operate and ma intain the degreaser equipment and emission control equipment in proper working order; b. An operator shall not remove or open any device designed to cover the solvent unless processing work in the degreaser or performing maintenance on the degreaser; c. An operator shall not degrease porous or absorbent materials such as cloth, leather, wood, or rope; d. An operator shall, upon detection of a solvent leak, repair the solvent leak immediately, or shut down and drain the degreaser; e. An operator shall use only a continuous fluid stream (not a fine, atomized, fan, or shower type spray) at a pressure which does not cause liquid solvent to splash outside of the solv ent container, if a solvent flow is utilized; f. An operator shall store or dispose of spent solvents, waste solvent cleaning materials such as cloth, paper, etc., in closed, non-absorbent and non-leaking containers. The containers shall remain closed at all times except when depositing or removing the contents of the containers or when the container is empty;

302.2 CLEANING METHOD: Use one of the following;

a. Use solvents < 25 grams/liter; b. A cold cleaner that meets the requirements of section 303; c. An open top vapor degreaser that meets the requirements of section 304; d. Airless/airtight cleaning equipment that meets the requirements of section 305; or e. A remote reservoir cold cleaner that meets the requirements of section 306

303 COLD CLEANER REQUIREMENTS: A cold cleaner shall meet all of the following:Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 14 303.1 An apparatus or cover must be used which prevents the solvent from evaporating when not processing work in the degreaser. The cover should be designed so that it can be opened and closed easily with one hand;

303.2 If the solvent initial boiling point is less than 248  F and the solvent is heated

above 122  F than the cold cleaner shall have a. A freeboard ratio greater or equal to 0.75; or
b. A water cover if the solvent is in soluble in and heavier than water;

303.3 If the solvent initial boiling point is less than 248  F then the drainage facility must be internal so that the parts are enclosed under the cover while draining. The drainage facility may be external for appli cations where an internal type cannot fit the cleaning system;

303.4 A facility for draining cleaned parts such that the drained solvent is returned to the container. Drain cleaned parts for at least 15 seconds after cleaning or until dripping ceases;

303.5. If using a solvent flow use only a continuous, fluid stream (not a fine, atomized, or shower type spray) at a pressure which does not cause liquid solvent to splash outside the solvent container;

303.6. Perform solvent agitation, where n ecessary, through pump re-circulation, ultrasonics, or by means of a mixer. Do not use agitation of the solvent bath;

303.7. A permanent, conspicuous label posted on or near the degreaser which lists each of the operating requirements in Section 303; and

303.8. A permanent conspicuous mark locating the maximum allowable solvent level that conforms to the freeboard requirement in Section 303.2.

304 OPEN TOP VAPOR DEGREASER REQUIREMENTS: An open top vapor degreaser shall meet all of the following requirements:

304.1 Workloads shall not occupy more than half of the degreaser's open top area;

304.2 Solvent spraying shall be done at least four (4) inches below the top of the vapor layer, and solvent flow shall be direct ed downward to avoid turbulence at the air-vapor interface and to prevent liquid solvent from splashing out of the degrease;

304.3 Water shall not be visually detectable in the solvent returning from the water separator to the solvent cleaner;

304.4 For open-top vapor degreasers equipped with a lip exhaust, the exhaust shall be turned off when the degreaser is covered;

304.5 If the unit is equipped with a refrigerate d freeboard chiller, or a primary condenser, or both, the following procedures shall be followed: a. When starting up the degreaser, the cooling system shall be turned on before, or simultaneously with, the sump heater; andYolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 15 b. When shutting down the degreaser, th e sump heater shall be turned off before, or simultaneously with, the cooling system;

304.6 Exhaust ventilation should not exceed 65 cfm/ft2 of degreaser open area, unless necessary to meet Occupational Safety & Health Administration (OSHA) requirements. Ventilation fans shall not be positioned in such a way to disturb the

vapor zone;

304.7 The vertical speed of a powered hoist fo r an open-top vapor degreaser, shall be not more than 2.2 inches/sec when moving parts in and out of the degreaser; and

304.8 The work load shall be degreased in the vapor zone until condensation ceases.

304.9 Open-top vapor degreasers shall be equipped with a cover designed such that it can be opened and closed easily without disturbing the vapor zone.

304.10 Open-top vapor degreasers shall be equipped with:
a. A freeboard with a freeboard ratio of at least 1.0. b. A container (degreaser) for the so lvent and the articles being cleaned; c. An apparatus or cover which preven ts the solvent from evaporating when not processing work in the degreaser; d. A facility for draining cleaned part s such that the drained solvent is returned to the container; e. A permanent, conspicuous label posted on or near the degreaser which lists each of the operating requirement s in Section 302.1 and Section 304;
and f. A permanent conspicuous mark lo cating the maximum allowable solvent level, that conforms to the freeboa rd requirement in Section 301.10.a. g. An automated parts handling system; h. Primary condensing coils; i. A perimeter trough; j. A water separator; k. A refrigerated freeboard chiller that is operated such that the chilled air blanket temperature measured at the ce nter of the air blanket is no greater than 40 percent of the boiling point of the solvent, and; l. A superheated vapor zone.

304.11 Open-top vapor degreasers shall not operat e without one (1) of the following or a combination of the following major control devices: a. Condenser equipment where the chille d air blanket temperature measured in degrees F at the coldest point on the vertical axis in the center of the degreaser shall be either no greater than 30 percent of the initial boiling point, measured in degrees F, of the solvent used, or 41°F; b. Enclosed design (cover or door opens only when the dry part is actually entering or exiting the degreaser); c. A carbon adsorption system which ventilates the air-vapor interface at a minimum rate of 50 cfm/ft2 of degr easer opening, but not greater than 65 cfm/ft2 of degreaser opening, unless required by OSHA standards, and exhausts less than 25 ppm of solvent by volume over a complete adsorption cycle, and with an overall capture and control efficiency of 85
percent; orYolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 16 d. Any other system of emission cont rol demonstrated to have an overall capture and control efficiency of at least 85 percent.

304.12 Open-top vapor degreasers shall include all of the following safety switches: a. A vapor level control switch
b. A condenser flow switch with a solvent temperature indicator, except where non-water refrigerant is used. The switch shall shut off the sump
heat if either the condenser coolant stops circulating or becomes warmer than specified; c. A spray pump safety switch; and d. A manual reset vapor level thermostat with a solvent temperature
indicator.

305 AIRLESS/AIRTIGHT CLEANING SYSTEM REQUIREMENTS: An airless/airtight cleaning system shall meet all of the following requirements:

305.1 The equipment is operated in accordance with the manufacturer’s specifications and operated with a door or other pressure sealing apparatus that is in place during all cleaning and drying cycles;

305.2 All associated pressure relief devices shall not allow liquid solvents to drain out. Spills during solvent transfer shall be wiped up immediately and handled in
accordance with Section 307.

305.3 A differential pressure gauge shall be installed to indicate the sealed chamber

pressure.

306 REMOTE RESERVOIR COLD CLEANER REQUIREMENTS: A remote reservoir cold cleaner shall meet all the following requirements:

306.1 Prevent solvent vapors from escaping fro m the solvent container by using such devices as a cover or a valve when the remote reservoir is not being used, cleaned, or repaired;

306.2 Direct solvent flow in a manner that will prevent liquid solvent from splashing outside of the remote reservoir cold cleaner;

306.3 A tank or sink-like work area which is sloped sufficiently to preclude pooling of solvent;

306.4 A single drain hole, less than 100 square centimeters (15.5 square inches) in area,
for the solvent to flow from the sink into the enclosed reservoir;

306.5 A freeboard ratio greater or equal to 0.75;

306.6 A cover for the drain when no work is processed.

307 STORAGE AND DISPOSAL - GENERAL: All solvents used, whether in its form for intended use or as a waste or used product, in cluding items such as cloth or paper laden with VOC containing materials, shall be stor ed in non-absorbent, non-leaking containersYolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 17 which shall be kept closed at all times, excep t when filling or emptying, and disposed of in a manner to prevent evaporation of VOCs into the atmosphere at the facility.

308 EMISSION CONTROL SYSTEM: In lieu of complying with the requirements in Sections 301 through 306 of this Rule, an operator may comply by using collection and control systems provided that the system is approved in writing by the APCO and during emission producing activities, the system complies with either:

308.1 The VOC emission control system

= s control device shall have a capture efficiency of at least 90 percent, by weight, of the emissions generated by surface preparation and cleanup and one of the following requirements:

a. The control device has a control e fficiency of at least 95 percent by weight, or

b. The VOC emission control system has an output of less than 50 parts per million by weight (ppm) calculated as carbon with no dilution; or

308.2 The emission control system meets the requirements of the applicable source specific rule of the District

= s Regulation II.

400 ADMINISTRATIVE REQUIREMENTS

401 PROHIBITION OF SPECIFICATION: A person shall not specify the use of any solvent used for surface preparation and cleanup s ubject to the provisions of this rule that does not meet the limits and requirements of this rule where such applications result in a violation of this rule. The requirements of th is Section shall apply to all written or oral

contracts.

402 COMPLIANCE STATEMENT REQUIREMENT: Any person who sells or distributes any solvent subject to this rule shall make available to the pur chaser at the time of sale the following information:

402.1 The name of the solvent;

402.2 The name of the manufacturer;

402.3 The maximum VOC content of the solven t as applied. The VOC content shall be expressed as grams of VOC per liter of so lvent, or pounds of VOC per gallon of solvent as determined pursuant to Section 602;

402.4 Recommendations regarding thinning, re ducing or mixing with any solvent, if applicable;

403 OPERATION AND MAINTENANCE PLAN (O&M PLAN): Any person using an emission control device pursuant to Section 308 of this Rule, as a means of complying with this rule, must submit with the application for Authority to Construct, pursuant to Rule 3.1, GENERAL PERMIT REQUIREMENTS, an O&M Pl an for the emission control device to the APCO for approval. The O&M Plan shall specify operation and maintenance procedures which will demonstrate continuo us operation of the control device duringYolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 18 periods of emission producing operations. The O&M Plan shall be maintained and re-submitted for approval by the APCO if cha nges to the control system require changing the plan. The O&M Plan shall also specify wh ich records must be kept to document these operation and maintenance procedures. These reco rds shall comply with the requirements of Section 502 of this Rule. Any person us ing an emission control device must fully comply with all O&M Plans submitted for approval, even if such O&M Plans have not yet been approved, unless notified in writing by the APCO.

500 MONITORING AND RECORDS

501 RECORD KEEPING - GENERAL: Any person using a solvent for all applications subject to this Rule, except those subject to Section 110 Exemption - General, shall
maintain records in a current file that contai ns all the data necessary to verify compliance and shall include the following:

501.1 Identification of each process at the facilit y subject to this Rule. The identification shall include the following: a. The location of the unit(s); b. The permit number (if applicable); c. Description of the method of application and substrate type.

501.2 The amount and type of each solvent used at each process, on a monthly basis. The following information should be included; a. The name of the solvent; b. The name of the solvent manufacturer;
c. The VOC content of the solvent e xpressed in grams/liter or lb/gallon; d. Solvent usage; e. The mix ratio for the cleaning solvent as applied.

501.3 A copy of the Manufacturer

= s product data sheet or mate rial safety data sheet of
the solvent used.

501.4 Any other such records needed to verify compliance with this rule.

502 RECORD KEEPING - EMISSION CONTROL SYSTEMS: If compliance with this rule is achieved through the use of an emissi on control system, in addition to the provisions of Section 501, the owner or operator shall maintain:

502.1 Daily usage records of all solvents.

502.2 Daily records of key operating parameters such as temperatures, pressures, flowrates, and hours of operation of the control device to verify compliance of the capture and control device.

502.3 Maintenance work which interferes w ith the operation of the control device.

503 BURDEN OF PROOF: Any person claiming exemption pu rsuant to Section 110, 111,
112 or 113 shall have information available such as product data or material safety data
sheets or records that would allow the APCO to verify the eligibility of the exemption.Yolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 19 504 RECORD RETENTION: All records required by Sections 501, 502, and 503 shall be maintained on site for a period of two years and made available to the APCO upon request.

600 TEST METHODS AND CALCULATIONS

601 GENERAL: For the purposes of this Rule, the following test methods or calculation
methods shall be used. Other test methods de termined to be equivalent and approved in writing by the District and the EPA may also be used. When more than one test method or set of test methods is specified for any testing, a violation of any requirement of this rule established by any one of the specified test met hods or set of test methods shall constitute a
violation of this Rule.

602 VOC CONTENT: The VOC content of organic solvents subject to the provisions of this rule shall be determined by: 602.1 procedures contained in EPA Reference Test Method 24 or 24A, 602.2 South Coast Air Quality Management District (SCAQMD) Method 304-91 “Determination of VOC in Various Materials”, February 1996; or 602.3 by using the manufacturer

= s product formulation data and formula listed in
Section 604.

603 EXEMPT COMPOUNDS: The content of exempt VOCs shall be determined by using CARB Method 432 (‘Determination of Dichloromethane and 1,1,1-Trichloroethane in Paints and Coatings’, or ‘Exempt Haloge nated VOC in Liquids’) or SCAQMD Method 303-91 (Determination of Exempt Compounds).

604 CALCULATION OF VOC CONTENT: The VOC content per volume of solvent shall be calculated by the following equation:

ܥܸܱ ௖௢௡ ൌ ሺܹ ௌ െ	ܹ ௐ െ	ܹ ாௌ ሻ

ܸ

ெ

where:

VOC ୡ୭୬ = Grams of VOC per liter of material

ܹ

ௌ = Weight of volatile compounds in grams

ܹ

ௐ = Weight of water in grams

ܹ

ாௌ = Weight of exempt compounds in grams

ܸ

ெ = Volume of material in liters

605 CALCULATION OF VOC COMPOSITE PARTIAL PRESSURE: The VOC composite partial pressure shall be calculated by the following equation:

ܲܲ ஼ ൌ	෍ ሺ ܹ ௜ ሻሺ ܸܲ ௜ ሻ

ܹܯ ௜ ܹ

ௐ ܹܯ ௐ ൅ ܹ ா ܹܯ ா ൅ ∑ ܹ ௜ ܹܯ ௜ ௡ ௜ୀଵ ௡

௜ୀଵ

where:

ܲܲ ஼ ൌ	VOC	composite	partial	pressure	at	20°C,	in	mm	Hg

ܸܲ ௜ ൌ	Vapor	pressure	of	the	"i"th	VOC	compound	at	20°C,	in	mm	HgYolo-Solano AQMD Revised May 8, 2013 Reg. II, Rule 2.31, Page 20 ܹ

௜ ൌ	Weight	of	the	"i"th	VOC	compound,	in	grams

ܹ

ௐ ൌ	Weight	of	water,	in	grams

ܹ

ா ൌ	Weight	of	exempt	compound,	in	grams

ܯܹ ௜ ൌ	Molecular	weight	of	the	"i"th	VOC	compound,	in	g/ሺg‐moleሻ

ܯܹ ௐ ൌ	Molecular	weight	of	water,	in	g/ሺg‐moleሻ

ܯܹ ா ൌ	Molecular	weight	of	exemp t	compound,	in	g/ሺg‐moleሻ

606 CAPTURE EFFICIENCY: The capture efficiency of a VOC emission control system

= s collection device shall be determined according to EPA

= s A Guidelines for Determining Capture Efficiency, @ January 9, 1995 and 40 CFR 51, Appendix M, Methods 204-204F, as applicable. If a permanent total enclosure is used, EPA Method 204 can also be used as an alternative method to determine capture efficiency.

607 CONTROL EFFICIENCY: The control efficiency a VOC emission control system

= s collection device shall be determined by using EPA Methods 2, 2A, or 2D for measuring flow rates and EPA Method 25, 25A, or 25B for measuring total gaseous organic
concentrations at the inlet and outlet of the control device. EPA Method 18 or CARB
Method 422 shall be used to determin e the emissions of exempt compounds.

608 SPRAY GUN CLEANING SYSTEMS: The determination of emissions of VOC from spray gun cleaning systems shall be made using South Coast Air Quality Management District "General Test Method for Determining Solvent Losses from Spray Gun Cleaning Systems" dated October 3, 1989.