Santa Barbara County APCD Rule 321 321 - 1 September 18, 1997[date of amended rule adoption]

RULE 321. SOLVENT CLEANING MACHINES OPERATIONSAND SOLVENT CLEANING. 

(Adopted 2/24/1975, readopted 10/23/1978, revised 6/11/1979, 7/10/1990, 4/17/1997, 

7/17/1997, and 9/18/1997, and [date of amended rule adoption]) 

A. Applicability

This Rule rule shall apply to any person who owns, operates, or uses any solvent cleaning machine or 

performs any solvent cleaning operation outside of a solvent cleaning machine operationsduring the 

production, repair, maintenance, or servicing of parts, products, tools, machinery, equipment, or in general 

work areas at any stationary source. 

B. Exemptions 

Except as otherwise specifically provided herein, the provisions of this rule shall not apply to the following: 

1. Any Ssolvent cleaning machine equipped with and any solvent cleaning performed with 

operations using a solvent (including emulsions) that contains two percent by weight or less of 

each of the following: 

a. rReactive organic compounds by weight (as determined by EPA Environmental 

Protection Agency method 24), and 

b. Toxic air contaminants (as determined by generic solvent data, solvent manufacturer’s 

composition data or by a gas chromatography test and a mass spectrometry test). shall not 

be subject to the requirements of this Rule. 

c. Any person claiming this exemption shall maintain the records specified in Sections 

R.1.a.1) and R.1.a.2) in a manner consistent with Section R.3 and make them available 

for review. 

2. Except for the Rule 321 Section G.2 requirement that the cleaner be covered when work is not 

being processed (use of covers are not required for remote reservoir cold cleaners using low 

volatility solvents), the provisions of this Rule shall not apply to an unheated solvent cleaner that: 

a. has a capacity of 3.785 liters (1 gallon) or less, or 

b. has an evaporative surface area of less than 929 square centimeters (1 square foot). 

However, if the aggregate evaporative surface area of all such solvent cleaners at a 

stationary source is greater than 0.929 square meters (10 square feet), none of the 

cleaners are exempt. 

32. The provisions of Rule 321 Section J.7 shall not apply to open-top vapor solvent cleaners with less 

than 1 square meter (10.8 square feet) of evaporative surface area. The cleaning of architectural 

coating application equipment provided that the solvent used does not exceed 950 grams of 

reactive organic compound per liter of material. 

4. The provisions of this Rule shall not apply to: 

a. wipe cleaning,

3.b. dDry cleaning operations of clothing or other fabrics covered under Rule 320, Petroleum Solvent 

Dry Cleaners, or 17 California Code of Regulations Title 17, Section 93109, Perchloroethylene 

Airborne Toxic Control Measure-- for Emissions of Perchloroethylene from Dry Cleaning and 

Water-Repelling Operations,.
Santa Barbara County APCD Rule 321 321 - 2 September 18, 1997[date of amended rule adoption]

4. c. sStripping of cured coatings (e.g., stripping), cured adhesives, (e.g., debonding, 

unglueing) cured sealants, and cured inks, except the stripping of such materials from spray 

application equipment. 

d. spray gun cleaning operations, 

5. e. Notwithstanding Section B.1, any batch vapor, in-line vapor, in-line cold, and batch cold 

solvent cleaning machines that uses any halogenated hazardous air pollutant solvent containing 

methylene chloride, perchloroethylene, trichloroethylene, 1,1,1-trichloroethane, carbon 

tetrachloride, or chloroform, or any combination of these halogenated hazardous air pollutants 

solvents, in a total concentration greater than 5 percent by weight, as a cleaning and/or drying 

agent, provided such a solvent cleaning machines are is subject to 40 CFR, Part 63, Subpart T, 

National Emission Standards for Hazardous Air Pollutants: Halogenated Solvent Cleaning, 

(Sections 63.460 et. seq.) or. 

f. cold solvent degreasers of 37.854 liters (10 gallons) or less in capacity, provided the 

degreasers are designed to operate in a closed system fashion (i.e., sealed when operated) 

and agitated through pump recirculation, mechanical mixing (a mixer), or with 

ultrasonics. Gas or air agitation shall not be used. 

6. Any equipment or operation that is subject to or specifically exempted by any of the following 

District rules. 

a. Rule 325, Crude Oil Production and Separation. 

b. Rule 326, Storage of Reactive Organic Compound Liquids. 

c. Rule 330, Surface Coating of Metal Parts and Products. 

d. Rule 337, Surface Coating of Aircraft or Aerospace Vehicle Parts and Products. 

e. Rule 339, Motor Vehicle and Mobile Equipment Coating Operations. 

f. Rule 343, Petroleum Storage Tank Degassing. 

g. Rule 344, Petroleum Sumps, Pits and Well Cellars. 

h. Rule 349, Polyester Resin Operations. 

i. Rule 351, Surface Coating of Wood Products. 

j. Rule 353, Adhesives and Sealants. 

k. Rule 354, Graphic Arts. 

7. Janitorial cleaning, including graffiti removal. 

8. Provisions of Sections H.7, I.7, K.6, and, M.1 shall not apply to the following: 

a. Cleaning of solar cells, laser hardware, scientific instruments, high-precision optics, 

telescopes, microscopes, avionic equipment, and aerospace and military fluid systems; 

and 
Santa Barbara County APCD Rule 321 321 - 3 September 18, 1997[date of amended rule adoption]

b. Cleaning in laboratory tests and analyses, including quality assurance and quality control 

applications, bench scale projects, or short-term (less than 2 years) research and 

development projects; and 

c. Cleaning of cotton swabs to remove cottonseed oil before cleaning of high-precision 

optics. 

d. In addition, the provisions of Sections H.7, I.7, and K.6 shall not apply to solvent 

cleaning machines employed with solvents having 900 grams of reactive organic 

compound per liter of material or less during the production, repair, maintenance, or 

servicing of electrical apparatus components, electronic components, satellites, satellite 

components, aerospace vehicles, aerospace vehicle components, aerospace vehicle 

payloads, aerospace vehicle payload components, medical devices, or silicone 

manufacturing. 

9. Solvent cleaning with aerosol products shall not be subject to Section D.9 and Section M.1 

provisions and the Section M.2.c prohibition on solvent atomization provided: 

a. 160 fluid ounces or less of aerosol products are used per day, per facility, and 

b. Records are maintained as specified in Sections R.2 and R.3, and 

c. The aerosol products comply with volatile organic compound limits for consumer 

products specified in the California Code of Regulations, Title 17, Section 94507 et seq. 

10. Provisions of Section M.1, Table 1, Solvent Cleaning Activity (c) shall not apply to the cleaning 

of application equipment when such equipment is used to apply a coating on a satellite or when 

applying a radiation-effect coating. 

11. Section D.9 and M.2.c prohibitions on solvent atomization shall not apply to the following 

applications: 

a. Cleaning of the nozzle tips of automated spray equipment systems, except for robotic 

systems. 

b. Cleaning with hand-held spray bottles, squirt bottles, and other closed containers having a 

capacity of one liter or less. 

c. Cleaning of gas turbines or jet engines using a gas-path solvent cleaner. 

12. De-icing of aircraft and aerospace vehicles. 

13. Solvent cleaning with a solvent containing 50 grams of reactive organic compounds per liter of 

material or less shall not be subject to the Section D.9 provision. 

14. Solvent cleaning to disinfect and decontaminate surfaces and equipment in hospitals, clinics, 

medical facilities, dental care facilities, and other health care facilities, including but not limited 

to, sanatoriums, convalescent hospitals, convalescent homes, skilled nursing facilities, nursing 

homes, blood banks, and bloodmobiles. 

15. Provisions of Section M.1 shall not apply if the net aggregate amount of solvent used for all 

solvent cleaning subject to Rule 321 (i.e., subject to Sections D, M.2, and/or M.3 provisions) at a 

stationary source does not exceed 55 gallons per year. Solvents with a reactive organic compound 

content of 50 grams per liter of material or less do not count towards the 55 gallons per year 

aggregate limit. Any person claiming this exemption shall maintain records as specified in 

Sections R.2 and R.3. 
Santa Barbara County APCD Rule 321 321 - 4 September 18, 1997[date of amended rule adoption]

16. Provisions of Section M.1 shall not apply to the following applications: 

a. Cleaning of ultraviolet lamps used to cure ultraviolet inks coatings, adhesives, or resins. 

b. Cleaning of mold release compounds from molds. 

c. Cleaning of aerospace assembly and subassembly surfaces that are exposed to strong 

oxidizers or reducers such as nitrogen tetroxide, liquid oxygen, or hydrazine. 

d. Cleaning of paper gaskets. 

e. Cleaning of clutch assemblies where rubber is bonded to metal by means of an adhesive. 

f. Cleaning of hydraulic actuating fluid from filters and filter housings. 

g. Wipe cleaning to remove crude oil and crude oil residue from well workover, drilling 

operations, and other activities related to petroleum production and processing on 

offshore platforms, provided the solvent reactive organic compound content does not 

exceed 800 grams per liter of material and the reactive organic compound composite 

partial pressure is no more than 8 millimeters of mercury at 20 degrees Celsius. 

17. Provisions of Sections H.7, I.7, and K.6 shall not apply to the following applications, provided the 

solvent reactive organic compound content does not exceed 900 grams per liter of material and the 

reactive organic compound composite partial pressure is no more than 5 millimeters of mercury at 

20 degrees Celsius: 

a. Cleaning associated with the manufacturing of nuts and bolts designed for automotive 

racing applications. 

b. Cleaning of precision–lapped mechanical seals in pumps that handle liquefied gasses. 

18. Provisions of Sections J.11.a, d, and e shall not apply to batch vapor cleaning machines with a 

solvent/air interface area less than 929 square centimeters (1 square foot) or a solvent capacity less 

than 2 gallons, provided all such solvent cleaning machines emit, in aggregate, less than 55 

pounds of reactive organic compounds per month per stationary source. Any person claiming this 

exemption shall maintain records as specified in Sections R.1 and R.3. 

19. The use of solvent for purposes other than cleaning. 

20. The Section E.7 and Section J.11.a, d, and e provisions shall not apply to batch vapor cleaning 

machines provided: 

a. The equipment was installed before January 1, 2007; and 

b. The solvent/air interface area is less than 4.40 square feet or the solvent capacity is less 

than 2 gallons; and 

c. The equipment is used only for cleaning electronic components; and 

d. The total aggregate reactive organic compound emissions from all batch vapor cleaning 

machines subject to this exemption do not exceed 188 pounds per month per stationary 

source; and 

e. The equipment is subject to a Permit to Operate to help facilitate verifications that the 

requirements of subparagraphs B.20.a, b, c, and d are met. 
Santa Barbara County APCD Rule 321 321 - 5 September 18, 1997[date of amended rule adoption]

f. In addition, the Section J.8 requirement to have a freeboard ratio of 1.0 or greater shall 

not apply to solvent cleaning machines meeting the requirements in subsections a – e 

above, provided the solvent cleaning machines have a freeboard ratio of 0.75 or greater. 

21. The Section I.3, I.4, and I.7 requirements for unheated batch cleaning machines shall not apply, 

provided the equipment is used in medical device manufacturing when performing incidental 

product cleaning in conjunction with quality assurance or quality control tests (e.g., when 

conducting leak testing of silicone shells) and the solvent reactive organic compound content does 

not exceed 900 grams per liter of material. 

22. Metal lift-off and other semiconductor and microelectromechanical device manufacturing 

processes involving thin film deposition, vacuum deposition, and dry etching operations; including 

any maintenance activities associated with such operations. 

23. The solvent container draining and filling provisions in Section D.12 shall not apply to solvent 

transfers out of a sump, provided the sump has a maximum capacity of 8 gallons or less, such 

sump is easily removed from the solvent cleaning machine, and the solvent is poured from the 

sump directly into a bulk storage container. 

24. Any batch vapor cleaning machine meeting all of the following requirements shall be exempt from 

the Section J.8 requirement to have a freeboard ratio of 1.0: 

a. The equipment is used only for cleaning electronic components; and 

b. The dimensions are such that the freeboard ratio is 0.75 or greater; and 

c. The solvent cleaning machine is equipped with the freeboard refrigeration device for 

which the chilled air blanket temperature (expressed in degrees Fahrenheit) at the coldest 

point on the vertical axis in the center of the air blanket shall be no greater than 30 

percent of the initial boiling point (expressed in degrees Fahrenheit) of the solvent used 

or no greater than minus 4 degrees Fahrenheit; and 

d. The batch vapor cleaning machine is equipped with a superheated vapor zone where parts 

remain in the vapor zone for at least the minimum dwell time, as specified by the 

manufacturer. The temperature within the superheated vapor zone shall be at least 10 

degrees Fahrenheit above the initial boiling point of the solvent being used. 

C. Definitions 

See Rule 102 for definitions not limited to this rule. For purposes of this rule the following definitions 

shall apply:

“Aerosol Product” means a hand-held, non-refillable container that expels pressurized product by means 

of a propellant-induced force. 

 

“Aerospace Vehicle” means the completed unit of any aircraft, helicopter, missile, or space vehicle. 

“Aerospace Vehicle Component” means any raw material, partial or completed fabricated part, assembly 

of parts, or completed unit of any aircraft, helicopter, missile, or space vehicle, including mockups and 

prototypes. 

“Air Blanket” means the layer of air inside the solvent cleaning machine freeboard located above the 

solvent/air interface. 
Santa Barbara County APCD Rule 321 321 - 6 September 18, 1997[date of amended rule adoption]

“Airless Solvent Cleaning Machine” means any solvent cleaning machine that is automatically operated 

and seals at an absolute internal pressure of 0.02 pounds per square inch absolute or less, prior to the 

introduction of solvent vapor into the cleaning chamber and maintains differential pressure under vacuum 

during all cleaning and drying cycles. 

“Air-Tight Solvent Cleaning Machine” means any solvent cleaning machine that is automatically 

operated and seals at a differential pressure no greater than 0.5 pounds per square inch absolute during all 

cleaning and drying operations. 

"Air-Vapor Interface" means, for vapor solvent cleaners, the top of the solvent-vapor layer, and the air 

touching this layer. The effective top of the vapor layer may be determined as the maximum height where 

condensation occurs on a cold metal object lowered into the vapor zone. 

"Air-Solvent Interface" means the point of contact between the exposed solvent and the air. 

“ASTM” means American Society for Testing and Materials Standards.

“Automated Parts Handling System” means a mechanical device that carries all parts and parts baskets at 

a controlled speed from the initial loading of soiled or wet parts through the removal of the cleaned or dried 

parts. Automated parts handling systems include, but are not limited to, hoists and conveyors. 

“Batch-loaded” means material placed in a nonconveyorized container for cleaning. 

“Batch Cleaning Machine” means a solvent cleaning machine in which individual parts or a set of parts 

move through the entire cleaning 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 machine, 

such as a Ferris wheel or a cross-rod degreaser, that clean multiple batch loads simultaneously and are 

manually or semi-continuously loaded are batch cleaning machines.

“Bench Scale Project” means a project (other than at a research and development facility) that is operated 

on a small scale, such as one capable of being located on a laboratory bench top. 

“Carbon adsorber” means a bed of activated carbon into which an air-solvent gas-vapor stream is routed 

and which adsorbs the solvent on the carbon. 

“Carry-out” see “Drag-out.”

“Circumferential Trough” means a receptacle located below the primary condenser that conveys 

condensed solvent and atmospheric moisture to a water separator. 

“Cold Cleaner” means any cleaner using solvent that, if heated, is maintained below the initial boiling 

point temperature. Cold cleaners include, but are not limited to, remote reservoirs, spray sinks, batchloaded dip tanks, and cold conveyorized degreasers. Cold cleaners do not include gas/liquid-path cleaners. 

“Cold Cleaning Machine” means 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 classified as cold 

cleaning machines. Cold solvent wash stations are classified as cold cleaning machines. 

“Condenser” or “Primary Condenser” means a device, such as cooling coils, used to condense (liquify) 

solvent vapor series of circumferential cooling coils on a vapor cleaning machine through which a chilled 

substance is circulated or recirculated to provide continuous condensation of rising solvent vapors and, 

thereby, create a concentrated solvent vapor zone. 

“Condenser Flow Switch” means a safety switch connected to a thermostat that shuts off the sump heater 

if the condenser coolant is either not circulating or exceeds its designed operating temperature.
Santa Barbara County APCD Rule 321 321 - 7 September 18, 1997[date of amended rule adoption]

“Continuous Cleaning Machine” see “In-Line Cleaning Machine.”

“Continuous Web Cleaning Machine” means a solvent cleaning machine in which parts such as film, 

coils, wire, and metal strips are cleaned at speeds typically in excess of 11 feet per minute. Parts are 

generally uncoiled, cleaned such that the same part is simultaneously entering and exiting the solvent 

application area of the solvent cleaning machine, and then recoiled or cut. For the purposes of this rule, all 

continuous web cleaning machines are considered to be a subset of in-line solvent cleaning machines.

“Control Device” means a device for reducing emissions of reactive organic compounds to the 

atmosphere. 

“Conveyorized (In-Line or Continuous) Cold Solvent CleanerCleaning Machine” means any 

continuously loaded solvent cleaner solvent cleaning machine that is not a conveyorized vapor solvent 

cleanercleaning machine. 

“Conveyorized (In-Line or Continuous) Solvent CleanerCleaning Machine” means any conveyorized 

cold or vapor solvent cleaner cleaning machine, that uses an automated parts handling system to 

automatically provide a continuous supply of parts to be cleaned. including Conveyorized (in-line or 

continuous) cleaning machines include but are not limited to gyro, vibra, monorail, cross-rod, mesh, belt, 

web, and strip cleanerscleaning machines. Strip cleaners cleaning machines clean material by drawing the 

strip itself through the unit for cleaning prior to coating or other fabrication processes. For the purposes of 

this rule “Conveyorized (In-Line or Continuous) Cleaning Machine” has the same meaning as “In-Line 

Cleaning Machine.” 

“Conveyorized (In-Line or Continuous) Vapor Solvent Cleaner Cleaning Machine” means any 

continuously loaded solvent cleaner cleaning machine that immerses parts in boiling solvent or in solvent 

vapors generated by boiling solvent. Conveyorized vapor solvent cleaners (in-line or continuous) cleaning 

machines that contain any vapor cleaning sections shall be considered to be conveyorized vapor solvent 

cleanerscleaning machines for the purposes of this rule. 

“Cross-Rod Solvent Cleaning Machine” means a batch solvent cleaning machine in which parts baskets 

are suspended from “cross-rods” as they are moved through the machine. In a cross-rod cleaning machine, 

parts are loaded semi-continuously, and enter and exit the machine from a single portal. 

“Degreaser” means any equipment designed and used for holding a solvent to carry out solvent cleaning 

operations. Degreasers include, but are not limited to, remote reservoir cold cleaners, batch-loaded cold 

cleaners, open-top vapor solvent cleaners, and conveyorized solvent cleaners. All degreasers can be 

classified as one of the following: 1) cold cleaner (including remote reservoir cold cleaners), 2) batchloaded vapor solvent cleaner, or 3) conveyorized solvent cleaner. 

“Downtime Mode” means the time period when a solvent cleaning machine is not cleaning parts and the 

sump heating coils, if present, are turned off. 

“Drag-out” or “Carry-out” means solvent carried out of a cleaner solvent cleaning machine that adheres 

to or is entrapped in the part being removed. 

“Drying Tunnel” means an add-on enclosure extending from the exit area of a conveyorized degreaser 

solvent cleaning machine that reduces drag-out losses by containing evaporating solvent. 

“Dwell” means the technique of holding parts within the freeboard area but above the vapor zone of the 

solvent cleaning machine. Dwell occurs after cleaning to allow solvent to drain from the parts or parts 

baskets back into the solvent cleaning machine. 

“Dwell Time” means the period of time when parts are held within the freeboard area of the solvent 

cleaning machine, after cleaning, to allow solvent to drain from the parts back into the solvent cleaning 

machine.
Santa Barbara County APCD Rule 321 321 - 8 September 18, 1997[date of amended rule adoption]

“Electrical Apparatus Components” means the internal components such as wires, windings, stators, 

rotors, magnets, contacts, relays, energizers, and connections in an apparatus that generates or transmits 

electrical energy including, but not limited to: alternators, generators, transformers, electric 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-line tools are also included in this category. 

“Electronic Components” means the portions of an assembly, including, but not limited to: circuit card 

assemblies, printed wire assemblies, printed circuit boards, soldered joints, ground wires, bus bars, 

magnetic tapes and tape drive mechanisms, discs and disc drive mechanisms, electro-optical devices (e.g., 

optical filters, sensor assemblies, infrared sensors, charged coupled devices, thermal electric coolers, and 

vacuum assemblies), solid state components, semiconductors (e.g., diodes, zeners, stacks, rectifiers, 

integrated microcircuits, transistors, solar cells, light sensing devices, and light-emitting devices), and other 

electrical fixtures, except for the actual cabinet in which the components are housed. 

“Emulsion” means a suspension of small droplets of one liquid in a second liquid. 

“Emission Control Device” means a device for reducing emissions of reactive organic compounds or 

toxic air contaminants to the atmosphere. 

“Evaporation” means to change into a vapor, normally from a liquid state. 

“Evaporative Surface Area” means: 

(1) Cold Solvent Cleaner: 

(a) The surface area of the top of the solvent.(b) Remote Reservoir Cold Cleaner: 

The solvent drain opening area. 

(2) Vapor Solvent Cleaner: The surface area of the top of the solvent vapor-air interface. 

(3) Conveyorized Solvent Cleaner: 

(a) Cold Cleaner: The surface area of the top of the solvent. 

(b) Remote Reservoir Cold Cleaner: The solvent drain opening area. 

(c) Vapor Solvent Cleaner: The surface area of the top of the solvent vapor-air 

interface. 

“Existing Solvent Cleaning Operation” means solvent cleaning that is being performed as of [date of 

amended rule adoption]. 

“Existing Solvent Cleaning Machine” means any solvent cleaning machine that is installed as of [date of 

amended rule adoption]. 

“Fluid System” means a power transmission system that uses the force of flowing liquids and gases to 

transmit power. Fluid systems include hydraulic systems and pneumatic systems. 

“Freeboard Area” means; for a batch cleaning machine, the area within the solvent cleaning machine that 

extends from the solvent/air interface to the top of the solvent cleaning machine; for an in-line cleaning 

machine, it is the area within the solvent cleaning machine that extends from the solvent/air interface to the 

bottom of the entrance or exit opening, whichever is lower.

“Freeboard Height” means:

(1) Cold Solvent Cleaner: The vertical distance from the top of the solvent, or the solvent 

drain of a remote reservoir cold cleaner, to the top of the cold cleaner. 

(2) Batch-loaded Vapor Solvent Cleaner: The vertical distance from the top of the solvent 

vapor-air interface to the top of the solvent cleaner.
Santa Barbara County APCD Rule 321 321 - 9 September 18, 1997[date of amended rule adoption]

(3) Conveyorized Solvent Cleaner: 

(a) For non-boiling solvent, the vertical distance from the top of the solvent to the 

bottom of the lowest opening in the solvent cleaner where vapors can escape. 

(b) For boiling solvent, the vertical distance from the top of the solvent vapor-air 

interface to the bottom of the lowest opening in the degreaser where vapors can 

escape.

“Freeboard Height” means; for a batch cleaning machine, the distance from the solvent/air interface as 

measured during the idling mode or the top of the solvent drain of a remote reservoir cold cleaning machine 

to the top of the cleaning machine; for an in-line cleaning machine, it is the distance from the solvent/air 

interface to the bottom of the entrance or exit opening, whichever is lower as measured during the idling 

mode. 

“Freeboard Ratio” means the ratio of the solvent cleaning machine freeboard height divided by the 

smaller of the inside length or the inside width (or diameter if applicable) of the solvent cleaner evaporative 

area to the smaller interior dimension (length, width, or diameter) of the solvent cleaning machine. 

“Freeboard Refrigeration Device (Also Called a ‘Chiller’)” means a secondary cooling coil mounted 

above the primary condenser that provides a chilled air blanket above the solvent vapor air-interface to 

cause the condensation of additional solvent vapor. A primary condenser capable of meeting the 

requirements of Section J.9.a or L.10.a is defined as both a freeboard refrigeration device and a primary 

condenser for the purposes of this rule. 

“Gas/Liquid-Path Solvent Cleaner” means a solvent cleaning machine (including ancillary equipment)

that applies solvent to the interior of parts, a gas turbine or jet engines, or equipment to clean gas and/or 

liquid paths. Gas/liquid-path cleaning operations include, but are not limited to, for the removal of 

corrosion, or combustion deposits, propellants, moisture, residuals, or other undesirable matter. Examples 

of gas/liquid-path cleaners include, but are not limited to, corrosion control carts (e.g., used on the interiors 

of gas turbine or jet engines), valve flushing systems, rocket engine flushing equipment, rocket propellant 

transfer line flushing and purging systems. 

“General Work Surface” means 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 work surface shall not include items defined under janitorial cleaning. 

“Guillotine Cover” means a cover that is biparting and moves in the same plane.

“Halogenated Hazardous Air Pollutant Solvent” means methylene chloride (Chemical Abstracts Service 

No. 75-09-2), perchloroethylene (Chemical Abstracts Service No. 127-18-4), trichloroethylene (Chemical 

Abstracts Service No. 79-01-6), 1,1,1-trichloroethane (Chemical Abstracts Service No. 71-55-6), carbon 

tetrachloride (Chemical Abstracts Service No. 56-23-5), and chloroform (Chemical Abstracts Service No. 

67-66-3). 

“High-Precision Optics” means any 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. 

“High Vapor Cutoff Thermostat” means a device, with a manual reset, that shuts off the sump heater if 

the temperature at the air-vapor interface rises above the designed operating level. 

“High Volatility Solvent” means any solvent that is not classified as a low volatility solvent. 

“Hoist” means a mechanical device that carries the parts basket and the parts to be cleaned from the 

loading area into the solvent cleaning machine and to the unloading area at a controlled speed. A hoist may 

be operated by controls or may be programmed to cycle parts through the cleaning cycle automatically. 
Santa Barbara County APCD Rule 321 321 - 10 September 18, 1997[date of amended rule adoption]

“Idling Mode” means the time period when a solvent cleaning machine is not actively cleaning parts and 

the sump heating coils, if present, are turned on. 

“Initial Boiling Point” means the boiling point of a solvent liquid as defined by ASTM D 1078-9505, 

“Standard Test Method for Distillation Range of Volatile Organic Liquids,” ASTM International.

“In-Line CleanerCleaning Machine” or “Continuous Cleaning Machine” means conveyorized solvent 

cleaner any solvent cleaning machine that uses an automated parts handling system, typically a conveyor, 

to automatically provide a continuous supply of parts to be cleaned. These units are fully enclosed except 

for the conveyor inlet and exit portals. In-line cleaning machines can be either cold or vapor cleaning 

machines. 

“Lip Exhaust” means a system that collects solvent vapors escaping from the top of a solvent cleaner 

device installed at the top of the opening of a solvent cleaning machine that draws in air and solvent vapor 

from the freeboard area and ducts the air and vapor away from the solvent cleaning machine. 

“Liquid Leak” means any ROC-containing liquid solvent leak at a rate of more than three drops per 

minute or any visible liquid mist. 

“Low Volatility Solvent” means a solvent with an initial boiling point that is greater than 120 degrees 

Celsius (248 degrees Fahrenheit) and with a temperature, as used, at least 100 degrees Celsius (180 212 

degrees Fahrenheit) below the initial boiling point. 

“Make-Up Solvent” means that solvent added to the solvent cleaning operation to replace solvent lost 

through evaporation or other means.

“Maintenance Cleaning” means a solvent cleaning operation or activity carried out to keep clean general 

work areas where manufacturing or repair activity is performed, to clean tools, machinery, molds, forms, 

jigs, and equipment. This definition does not include the cleaning of adhesive, coating, or ink application 

equipment. 

“Manufacturing Process” means the process of making goods or articles by hand or by machinery. 

“Medical Device” means an instrument, apparatus, implement, machine, contrivance, implant, in vitro 

reagent or other similar article, including any component, accessory, raw material, partial or completed 

fabricated part, that meets one of the following conditions: 

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 

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

3. It is defined in the National Formulary or the United States Pharmacopeia, or any 

supplement to them. 

“Mixer” means any device that mechanically agitates the liquid solvent to enhance the cleaning process. 

“Nonabsorbent Container” means any container made of nonporous material, which does not allow the 

migration of the liquid solvent through it. 

“Nonatomized Solvent Flow” means the use of a solvent in the form of a liquid stream without 

atomization.

“Nonleaking Container” means a container without any liquid leaks. 

“Open-Top Vapor Solvent CleanerCleaning Machine” means any batch-loaded degreaser using solvent 

that is maintained above the initial boiling point temperature of the solvent. Degreasing occurs through the 

condensation of the resultant solvent vapor onto the surface of the workload a batch solvent cleaning 
Santa Barbara County APCD Rule 321 321 - 11 September 18, 1997[date of amended rule adoption]

machine that has its upper surface open to the air and boils solvent to create solvent vapor used to clean 

and/or dry parts. 

“Primary Condenser” see “Condenser.” 

“Radiation-Effect Coating” means a material that prevents radar detection. 

“Reactive Organic Compound Composite Partial Pressure” means the sum of the partial pressures of 

compounds defined as reactive organic compounds. Reactive organic compound composite pressure shall 

be calculated as follows: 

Where: 

 Wi = Weight of the “i”th reactive organic compound, in grams 

 Ww = Weight of water, in grams 

 We = Weight of the “e”th exempt organic compound, in grams 

 MWi = Molecular weight of the “i”th reactive organic compound, in grams per grams-mole 

 MWw = Molecular weight of water, in grams per grams-mole 

 MWe = Molecular weight of the “e”th exempt compound, in grams per grams-mole 

 PPc = Reactive organic compound composite partial pressure at 20 degrees Celsius, in millimeters of 

 mercury 

 VPi = Vapor pressure of the “i”th reactive organic compound at 20 degrees Celsius, in millimeters of 

 mercury 

“Refrigerated Freeboard Chiller” means a secondary cooling coil mounted above the primary condenser 

that provides a chilled air blanket above the solvent vapor air-interface to cause the condensation of 

additional solvent vapor. see the definition for “Freeboard Refrigeration Device (also called a 

‘Chiller’).”

“Remote Reservoir Cold Cleaner Cleaning Machine” means any device in which liquid solvent is 

pumped through to a sink-like work area for cleaning parts and that drains immediately solvent back into an 

enclosed container while parts are being cleaned, without forming a allowing no solvent to pool in the work 

area, through a single drain hole less than 100 square centimeters (15.5 square inches) in area into an 

enclosed container that is not accessible for soaking parts. A remote reservoir cold cleaning machine that 

uses an enclosed container that is accessible for dipping or soaking parts is also considered to be a batch 

cleaning machine. 

“Repair Cleaning” means a solvent cleaning operation or activity carried out during a repair process. 

“Repair Process” means the process of returning a damaged object or an object not operating properly to 

good condition. 

“Research and Development Activities” means activities conducted at a research or laboratory facility 

whose primary purpose is to conduct research and development into new processes and products, where 

such source is operated under the close supervision of technically trained personnel and is not engaged in 

the manufacture of products for sale or exchange for commercial profit, except in a de minimis manner. 

“Rotating Basket” means a perforated or wire mesh cylinder containing parts to be cleaned that is slowly 

rotated while proceeding through the degreaser solvent cleaning machine. 
Santa Barbara County APCD Rule 321 321 - 12 September 18, 1997[date of amended rule adoption]

“Scientific Instrument” means an instrument (including the components, assemblies, and subassemblies 

used in their manufacture) and associated accessories and reagents that is used for the detection, 

measurement, analysis, separation, synthesis, or sequencing of various compounds. 

“Semiconductor Manufacturing” means any process or operation producing semiconductor material, 

slicing or polishing semiconductor material, utilizing photoresist to manufacture intermediate products, or 

producing either semiconductor devices or related solid state devices. 

“Silicone Manufacturing” means any process or operation producing a silicone raw material (e.g., 

polymer, fluid, gum, gel, elastomer, dispersion, or other bulk state silicone material). Silicone 

manufacturing also includes any on site preliminary processes or operations that occurs before a silicone 

raw material is produced. 

 

“Soils” mean contaminants that are removed from the part or parts being cleaned. Soils include, but are 

not limited to, grease, oils, waxes, metal chips, carbon deposits, fluxes, and tars. 

“Solvent” means “Organic Solvent.”any liquid containing any reactive organic compound or any toxic air 

contaminant, which is used as a diluent, thinner, dissolver, viscosity reducer, cleaning agent, drying agent, 

preservative, or other similar uses.

“Solvent/Air Interface” means, for a vapor cleaning machine, the location of contact between the 

concentrated solvent vapor layer and the air. This location of contact is defined as the mid-line height of 

the primary condenser coils. For a cold cleaning machine, it is the location of contact between the liquid 

solvent and the air.

“Solvent/Air Interface Area” means; for a vapor cleaning machine, the surface area of the solvent vapor 

zone that is exposed to the air; for an in-line cleaning machine, it is the total surface area of all the sumps; 

for a cold cleaning machine, it is the surface area of the liquid solvent that is exposed to the air, except for 

remote reservoir cleaning machines, in which case it is the area of the drain. 

“Solvent Cleaner” means a device that applies solvent or in which solvent is applied to items for the 

purpose of solvent cleaning. 

“Solvent Cleaning” means the use of organic solvent to remove loosely held uncured adhesives, uncured 

inks, uncured coatings, and other contaminants that include, but are not limited to, dirt, soil, lubricants, 

coolant, moisture, grease and fingerprints from parts, products, tools, machinery, equipment and general 

work areas. any activity, operation, or process (including, but not limited to, surface preparation, cleanup, 

or wipe cleaning) performed outside of a solvent cleaning machine, that uses solvent to remove uncured 

adhesives, uncured coatings, uncured inks, uncured polyester resin material, uncured sealant, 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 coating, adhesive, ink, polyester resin material, or sealant is 

also considered to be solvent cleaning irrespective of the spray material being cured. 

“Solvent Cleaning Machine” means any device or piece of equipment that uses solvent liquid or vapor to 

remove soils, moisture, or other contaminants from the surfaces of materials. Types of solvent cleaning 

machines include, but are not limited to, batch cold, batch vapor, in-line cold, in-line vapor, remote 

reservoir, and gas-path solvent cleaners. Buckets, pails, and beakers with capacities of 3.785 liters (1.00 

gallon) or less are not considered solvent cleaning machines. However, the use of such a container or 

similar containers (e.g., hand-held spray bottles) with a liquid solvent for cleaning is considered to be 

solvent cleaning. Any device or piece of equipment used exclusively for stripping shall not be considered 

to be a solvent cleaning machine. 

“Solvent Container” means that part of the solvent cleaner cleaning machine that is intended to hold the 

cleaning solvent. 
Santa Barbara County APCD Rule 321 321 - 13 September 18, 1997[date of amended rule adoption]

“Solvent Vapor Zone” means; for a vapor cleaning machine, the area that extends from the liquid solvent 

surface to the level that solvent vapor is condensed. This condensation level is defined as the midline 

height of the primary condenser coils. 

“Space Vehicle” means a vehicle designed to travel beyond the earth’s atmosphere. 

“Space Vehicle Component” means any raw material, partial or completed fabricated part, assembly of 

parts, or completed unit of any space vehicle, including mockups and prototypes. 

“Spray Pump Control Switch” means a safety switch that prevents the spray pump from operating if the 

vapor level falls below the design operating level. 

“Sump” means the part of a solvent cleaning machine where the liquid solvent is located. 

“Sump Heater Coils” mean the heating system on a cleaning machine that uses steam, electricity, or hot 

water to heat or boil the liquid solvent. 

“Superheated Vapor System” means a system that heats the solvent vapor, either passively or actively, to 

a temperature above the solvent's initial boiling point. Parts are held in the superheated vapor before 

exiting the machine to evaporate the liquid solvent on them. Hot vapor recycle is an example of a 

superheated vapor system. 

“Superheated Vapor Zone” means any region located within the vapor zone of a vapor cleaning machine 

whereby solvent vapors are heated above the solvent’s initial boiling point. 

“Ultrasonics” means enhancement of the cleaning process by agitation of liquid solvents with high 

frequency sound wave vibrations. 

“Vapor Cleaning Machine” means 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. 

“Vapor Level Control Switch or Vapor Level Control Thermostat” see “High Vapor Cutoff 

Thermostat.” 

“Vapor Solvent Cleaner” means any solvent cleaners that cleans through the condensation of hot solvent 

vapor on colder workloads. 

“Waste Solvent Residue” means sludge that may contain dirt, oil, metal particles, and/or other undesirable 

waste products concentrated after heat distillation of the waste solvent either in the solvent cleaner cleaning 

machine itself or after distillation in a separate still. 

“Water Layer” means a layer of water that floats above the denser solvent and provides control of solvent 

emissions. In many cases, the solvent used in batch cold cleaning machines is sold containing the 

appropriate amount of water to create a water cover. 

“Wipe Cleaning” means that method of cleaning that uses a material such as a rag wetted with a solvent, 

coupled with a physical rubbing process to remove contaminants from surfaces. 

“Workload” means the objects put in a cleaner solvent cleaning machine for the purpose of removing oil, 

grease, soil, coating, dirt, moisture, or other undesirable matter from the surface of the objects. 
Santa Barbara County APCD Rule 321 321 - 14 September 18, 1997[date of amended rule adoption]

“Workload Area” means: 

(1) The plane geometric surface area of the top of the submerged parts basket, or 

(2) The combined plane geometric surface area(s) displaced by the submerged workload, if 

no basket is used. 

D. General Operating Requirements. Any person who owns, operates, or uses any solvent cleaner cleaning 

machine or performs any solvent cleaning shall ensure such operation conforms to the following operating 

requirements:

1. All Ssolvent, including waste solvent and waste solvent residue, and waste solvent cleaning 

materials such as cloth, paper, etc. shall not be stored or disposed of in a manner that will cause or 

allow evaporation into the atmospherein nonabsorbent and nonleaking containers equipped with 

tight-fitting covers. The covers shall be in place unless adding material to or removing material 

from the containers, the containers are empty, or doing maintenance/inspection of the containers. 

Containers shall have a label indicating the name of the solvent/material they contain. After 

distillation recovery of waste solvent, solvent residues shall not contain more than 20 percent 

solvent of reactive organic compound by weight. 

2. The solvent cleanercleaning machine, ventilation system, and/or emission control equipment shall 

be installed, operated, and maintained in proper working order consistent with the manufacturer’s 

specifications. 

3. Solvent The cleaning or solvent vapor cleaning of porous or absorbent materials, such as cloth, 

leather, wood, or rope, is prohibited. This provision shall not apply to paper gaskets, paper filters, 

and medical devices.

4. The All solvent containers holding solvent shall be free of all liquid leaks. Auxiliary cleaner 

Solvent cleaning machine equipment, such as covers, pumps, water separators, steam traps, or 

distillation units shall not have any liquid leaks, visible tears, holes, or cracks. Any such liquid 

leak, visible tear, hole, or crack that is detected shall be repaired within one day from discovery by 

the operator, or the cleaner solvent cleaning machine shall be drained of all solvent, in a manner 

authorized by this Ruleconsistent with Section D.12 provisions, and shut down until replaced or 

repaired. Solvent cleaners cleaning machines shall not be operated when leaking. 

5. Covers and other closure devices (e.g., valves or drain plugs) designed to reduce solvent 

evaporation shall not be removed or opened except to process work or to perform monitoring, 

inspections, maintenance, or repairs that require the removal of the covers or other closure 

devices. Solvent cleaning machines shall not be operated when performing maintenance or 

repairs. 

6. For solvent degreaser cleaning machine operations other than gas-path solvent cleaners and 

continuous web cleaning machines, solvent carry-out shall be minimized by the following 

methods, as applicable: 

a. Except for remote reservoir cold cleaning machines, The the workload shall be racked. 

b. For manual operations, any pools of solvent remaining on the cleaned parts shall be 

tipped out before removing them from the cleaner.Parts having cavities, holes, or blind 

holes shall be tipped or rotated before being removed from the solvent cleaning machine 

such that the solvent in the cavities, holes, or blind holes is returned to the solvent 

container.

c. Pools of solvent shall be drained by a device. 
Santa Barbara County APCD Rule 321 321 - 15 September 18, 1997[date of amended rule adoption]

dc. The workload shall be drained within the freeboard area so that the drained solvent is 

returned to the solvent container. 

ed. For cold solvent cleaning, parts shall be drained immediately after cleaning, until one of 

the following conditions exists: 

 1) At least 15 seconds have elapsed; or 

 2) Dripping of solvent ceases; or 

 3) The parts become visibly dry. 

fe. For automated parts handling systems, Tthe workload shall be moved in and out of the 

degreaser solvent cleaning machine at less than 3.33.4 meters per minute (11.2 feet per 

minute). 

7. For solvent degreaser cleaning machine operations other than gas-path solvent cleaners and 

continuous web cleaning machines, solvent flow shall be directed downward to avoid turbulence 

at the air-vapor or air-solvent solvent/air interface and to prevent liquid solvent from splashing 

outside of the cleanersolvent cleaning machine. If a flexible hose or flushing device is used, 

flushing shall be performed only within the freeboard area of the solvent cleaning machine.

8. For solvent degreaser cleaning machine operations other than gas-path solvent cleaners, solvent 

flow shall not be used in a manner such that liquid solvent splashes outside the container. 

9. Solvent atomization operations (e.g., blow drying) shall not be atomized unless be it is vented to 

an emission control system that meets the requirements of Rule 321 Section MN.

10. Any solvent spills shall be wiped up immediately and the used absorbent material (e.g., cloth, 

paper, sand, sawdust, etc.) shall be stored in closed containers that are handled in accordance with 

Section D.1. 

11. Solvent levels shall not exceed the solvent cleaning machine’s fill line. 

12. Draining or filling solvent containers shall be performed at a level lower than the liquid solvent 

surface. 

13. When using a ventilation fan, it shall not be positioned in such a way as to direct air flow near a 

solvent cleaning machine opening. 

E. Additional Operating Requirements for Open-top Batch Vapor Solvent Cleaners Cleaning Machines 

and In-Line Conveyorized Vapor Solvent CleanersCleaning Machines. In addition to the general 

operating requirements specified above in Rule 321 Section D, aAny person who owns, operates, or uses 

any open-top batch vapor solvent cleaner cleaning machine or any conveyorized in-line vapor solvent 

cleaner cleaning machine shall ensure the equipment operation conforms to the following operating 

requirements:

1. The degreaser shall be covered whenever the cooling system is off. Except to perform monitoring, 

inspections, maintenance, or repairs that require the removal of the covers: 

a. Idling mode covers shall be closed or in place when the equipment is in an idling mode. 

b. Downtime mode covers shall be closed or in place when the equipment is in a downtime 

mode. 
Santa Barbara County APCD Rule 321 321 - 16 September 18, 1997[date of amended rule adoption]

2. When starting the degreaser solvent cleaning machine, the cooling system primary condenser shall 

be turned on before or simultaneously with the sump heater. 

3. When shutting down the degreaser solvent cleaning machine, the sump heater shall be turned off 

and the solvent vapor layer allowed to collapse before or simultaneously with the cooling system 

primary condenser is turned off. 

4. The workload shall be degreased cleaned in the vapor zone for at least 30 seconds or until 

condensation ceases. 

5. Parts shall be allowed to dry within the degreaser solvent cleaning machine until the exterior 

surface of the parts become visually dry. 

6. Solvent spray shall be kept at least 10 centimeters (3.94 inches) below the air-vapor solvent/air 

interface. 

7. The workload area shall not occupy more than half of the evaporative surface areasolvent/air 

interface area of the solvent cleaner cleaning machine. 

8. For cleaners solvent cleaning machines equipped with water separators, water shall not be visibly 

detectable in the solvent phase exiting the water separator, nor shall solvent be visibly detectable 

in the aqueous phase leaving the separator. 

9. If equipped with a superheated vapor zone: 

a. The manufacturer's specifications for determining the minimum proper dwell time within 

the superheated vapor system shall be followed. 

b. Parts and parts baskets shall remain in the vapor zone for at least the minimum proper 

dwell time. 

c. The temperature within the superheated vapor zone shall be at least 10 degrees 

Fahrenheit above the initial boiling point of the solvent being used.

F. Additional Operating Requirements for Gas/Liquid-Path CleanersSolvent Cleaners. In addition to 

the operating requirements specified in Rule 321 Sections D.1 - D.5 and D.9, aAny person who owns, 

operates, or uses using any gas/liquid-path cleaner gas-path solvent cleaner shall ensure the equipment 

operation conforms to the following operating requirements: 

1. Cleaned parts or equipment shall be drained until dripping ceases or 15 seconds have elapsed. 

2. The cover of the solvent container(s), reservoir(s) and opening(s) of a solvent collection system 

shall be closed at all times except when the reservoir is being filled, emptied, cleaned, repaired or 

inspected to process work or to perform monitoring, inspections, maintenance, or repairs that 

require the removal of the covers or other closure devices. 

G. General Equipment Requirements for Solvent CleanersCleaning Machines. Any person who owns, 

operates, or uses All any solvent cleaners cleaning machine shall ensure that it is equipped with conform to 

the following requirements:

1. A container shall be used for the solvent. 

2. Except for remote reservoir cold cleaners cleaning machines using low volatility solvents, all 

cleaners shall be equipped with an apparatus or cover(s) to completely cover the solvent container 

when not processing work.
Santa Barbara County APCD Rule 321 321 - 17 September 18, 1997[date of amended rule adoption]

3. Solvent degreasers shall be equipped with a facility Except for gas-path solvent cleaners using a 

solvent with a reactive organic compound content of 50 grams per liter of material or less, an 

apparatus or a device for draining cleaned parts such that the drained solvent or drag-out is 

returned to the cleaner solvent tankcontainer. 

4. The A list of the applicable operating requirements. At a minimum, the list shall include the 

applicable operating requirements contained in Rule 321 Sections D, E, and F. The list of 

operating requirements shall be legibly written legible and permanently and conspicuously posted 

or maintained on or near the equipment in such a manner that it is conveniently available to the 

operator for reference purposes. 

5. Where solvent agitation is used, the equipment that achieves agitation shall be achieved by use of 

using pump recirculation, mechanical mixing (a mixer), or ultrasonics. Gas or air agitation shall 

not be used. When a pump-agitated solvent bath is used, the pump agitator shall be designed to 

produce a rolling motion of the solvent without any observable splashing against tank walls or 

parts being cleaned.

6. When employing solvent flow, with a solvent degreaser, the flow shall only be a flexible hose or 

flushing device that produces only a continuous fluid stream. An atomized or shower type spray 

shall not be used. I unless it is used in an conveyorized in-line or enclosed cleanersolvent cleaning 

machine, a shower type spray may be used provided that where the spray is conducted in a totally 

confined space that is sealed from the atmosphere. 

7. Any degreaser equipped with Where a hood, enclosure, or lip exhaust, or a lip exhaust connected 

to a hood or enclosure is employed, shall not have an a blower or fan such that the air ventilation 

rate in excess of shall not exceed 20 cubic meters per minute per square meter (65.6 cubic feet per 

minute per square feet) of air-vapor or air-solvent solvent/air interface surface area, unless 

necessary to meet a National Institute for Occupational Safety and Health standard. 

8. Effective July 17, 1997, no person shall install or add a lip exhaust to a degreaser When a lip 

exhaust unless it is is installed or added after July 17, 1997,vented to an emission control system 

that meets the requirements of Rule 321 Section M N. 

9. A The average draft rate in the solvent cleaner workroom having an average draft rate, as 

measured parallel to the plane of the degreaser solvent cleaning machine opening, shall not 

exceeding 9.1 meters per minute (30 feet per minute), unless necessary to meet a National 

Institute for Occupational Safety and Health standard. 

10. Ventilation fans shall not be positioned in such a way as to direct air flow near the degreaser 

openings. 

1110. When employing an automated parts handling system, The vertical equipment such that the speed 

of any powered hoist or conveyor of the parts shall not exceed 3.33.4 meters per minute (11.2 feet 

per minute). 

H. Additional Equipment Requirements for Remote Reservoir Cold CleanersCleaning Machines. In 

addition to the requirements in Rule 321 Section G, Any person who owns, operates, or uses any remote 

reservoir cold cleaner equipment cleaning machine shall ensure that it is equipped with meet the following

requirements: 

1. The A sink or work area shall be that is sloped sufficiently towards the drain to prevent pooling of 

solvent. 

2. There shall be aA single drain hole, not larger than 100 square centimeters (15.5 square inches) in 

area, for the solvent to flow from the sink into the enclosed reservoir. 
Santa Barbara County APCD Rule 321 321 - 18 September 18, 1997[date of amended rule adoption]

3. Except for remote reservoir cold cleaners when using low volatility solvents, a cover or a device, 

such as a valve or a drain plug, to prevent or minimize the solvent vapor emissions shall be 

prevented from escaping from the solvent container by means of closing a cover or a device, such 

as a valve or a drain plug, when the remote reservoir is not being used, cleaned, or repaired not 

processing work or performing monitoring, inspections, maintenance, or repairs that require the 

removal of the cover or device. 

4. The A freeboard height shall be of 6 inches or higher. 

5. The unit shall have a When the solvent is heated above 50 degrees Celsius (122 degrees 

Fahrenheit), or it is agitated, or the solvent is a high volatility solvent, dimensions such that the 

freeboard ratio of is 0.75 or greater., if the solvent is heated above 50 degrees Celsius (122 degrees 

Fahrenheit), agitated, or a high volatility solvent is used.

6. In lieu of the freeboard height required by Rule 321 Section H.4 or the freeboard ratio required by 

Rule 321 Section H.5, one of the following requirements shall may be met: 

a. a A water cover layer at a minimum thickness of 2.5 centimeters (1.0 inch) on the surface 

of the solvent within the cleaning machine at least 1 inch deep shall be used, provided the 

solvent is insoluble in water and has a specific gravity greater than 1, or 

b. aAn emission control system that meets the requirements of Rule 321 Section M N shall 

be used.

7. Effective [one year from the date of amended rule adoption], except when using an emission 

control system that meets the requirements of Section N, solvent that contains 50 grams of 

reactive organic compound per liter of material or less.

I. Additional Equipment Requirements for Batch Cold CleanersCleaning Machines. In addition to the 

requirements specified in Rule 321 Section G, Any person who owns, operates, or uses any batch cold 

cleaners cleaning machine other than a remote reservoir cold cleaning machine shall ensure that it is 

equipped with include all of the following: 

1. When using a high volatility solvent, the unit shall be equipped with a cover that is a sliding, 

rolling, or guillotine type that is designed to easily open and close. If a mechanized batch cold 

cleaning machine (e.g., a manually loaded or semi-continuously loaded Ferris wheel or cross-rod 

solvent cleaning machine) is used with a high volatility solvent, the unit shall be equipped with a 

downtime mode cover.

2. A method for draining cleaned parts, so the drained solvent is returned to the container. If using a 

high volatility solvent, the drainage facility apparatus or device required by Section G.3 shall be 

internal so that the cleaned parts are within the solvent cleaner cleaning machine and under the 

cover while draining. The drainage facility apparatus or device may be external where the internal 

type cannot fit into the cleaning system provided the drained solvent is returned to the solvent 

container. 

3. When using a low volatility solvent that is not agitated, the a freeboard height shall be of 6 inches 

or higher or dimensions such that a the freeboard ratio of is 0.5 or greater shall be maintained. 

4. The unit shall have a When the solvent is heated above 50 degrees Celsius (122 degrees 

Fahrenheit), or it is agitated, or the solvent is a high volatility solvent, dimensions such that the 

freeboard ratio of is 0.75 or greater., if the solvent is heated above 50 degrees Celsius (122 degrees 

Fahrenheit), agitated, or a high volatility solvent is used.

5. In lieu of the freeboard height or freeboard ratio required by Rule 321 Section I.3 or the freeboard 

ratio required by Section I.4, one of the following requirements may be met: 
Santa Barbara County APCD Rule 321 321 - 19 September 18, 1997[date of amended rule adoption]

a. a water cover at least 1 inch deep shall be used, provided the solvent is insoluble in water 

and has a specific gravity greater than 1A water layer at a minimum thickness of 2.5 

centimeters (1.0 inch) on the surface of the solvent within the cleaning machine shall be 

used, or 

b. aAn emission control system shall be used that meets the requirements of Rule 321 

Section M N shall be used. 

6. A permanent, conspicuous mark shall be maintained locating denoting the maximum allowable 

solvent level conforming to the applicable freeboard requirements. This requirement does not 

apply if employing a water cover layer or an emission control system per Rule 321 Section I.5. 

7. Effective [one year from the date of amended rule adoption], except when using an emission 

control system that meets the requirements of Section N, solvent that contains 50 grams of 

reactive organic compound per liter of material or less. 

J. Additional Equipment Requirements for Open-top Batch Vapor Solvent CleanersCleaning 

Machines. In addition to the requirements specified in Rule 321 Section G, open-top Any person who 

owns, operates, or uses any batch vapor solvent cleaners cleaning machine shall ensure that it is equipped 

with include all of the following: 

1. For open-top vapor cleaning machines, A a cover that is a sliding, rolling, or guillotine type that is 

designed to easily open and close without disturbing the vapor zone. This requirement does not 

apply to open-top vapor solvent degreasers cleaning machines equipped with top enclosures, 

provided: 

a. the operator only opens the enclosure cover(s) or door(s) when the condenser is operative 

or when the degreaser solvent cleaning machine is shut down, and

b. the degreaser solvent cleaning machine evaporative surface areasolvent/air interface area

is less than 1 square meter (10.8 square feet), and 

c. the degreaser solvent cleaning machine cover is designed such that it can be opened and 

closed easily without disturbing the vapor zone. 

2. For mechanized batch vapor cleaning machines (e.g., a manually-loaded or semi-continuouslyloaded Ferris wheel or cross-rod solvent cleaning machine), idling and downtime mode covers. 

23. A primary condenser coil situated above the boiling solvent. 

34. A condenser flow switch that automatically shuts off the sump heater if the condenser coolant 

stops circulating or becomes warmer than its designed operating temperature. 

45. A high vapor level cutoff thermostat control device that automatically shuts off the sump heater 

when if the solvent vapor level in the vapor cleaning machine rises above the designed operating 

level height of the primary condenser. 

56. For degreasers solvent cleaning machines with solvent flow, a device such as a spray pump 

control switch that prevents the solvent flow pump operation unless the solvent vapor level is at 

the designed operating level. 

7. A device that automatically shuts off the sump heat if the sump liquid solvent level drops to the 

sump heater coils. 
Santa Barbara County APCD Rule 321 321 - 20 September 18, 1997[date of amended rule adoption]

68. A Dimensions such that the freeboard ratio of is 0.75 or greater. Effective [one year from the date 

of amended rule adoption], the unit shall have dimensions such that the freeboard ratio is 1.0 or 

greater. 

 

79. Cleaners For solvent cleaning machines with an evaporative surface areaa solvent/air interface 

area of 1 square meter (10.8 square feet) or greater shall be equipped with one of the following: 

a. A refrigerated freeboard chiller freeboard refrigeration device for which the chilled air 

blanket temperature (expressed in degrees Fahrenheit) at the coldest point on the vertical 

axis in the center of the air-vapor interface air blanket shall be no greater than 30 percent 

of the initial boiling point (expressed in degrees Fahrenheit) of the solvent used or no 

greater than 40 degrees Fahrenheit. If the chiller operates below 32 degrees Fahrenheit, it 

shall be equipped with an automatic defrost.; or

b. An enclosed design in which the cover or door opens only when the dry part is actually 

entering or exiting the cleaner solvent cleaning machine. 

810. In lieu of the freeboard ratio required by Rule 321 Section J.68 or the freeboard chiller/enclosed 

design required by Section J.79, an emission control system that meets the requirements of Section 

M N may be used. 

11. Effective [one year from the date of amended rule adoption], except when an emission control 

system that meets the requirements of Section N is employed, when using solvent containing in 

excess of 50 grams of reactive organic compound per liter of material: 

a. An automated parts handling system; 

b. A circumferential trough; 

c. A water separator (not required for solvents that form azeotropes with water); 

d. A freeboard refrigeration device that is operated such that the chilled air blanket 

temperature, measured at the center of the air blanket, is no greater than 40 percent of the 

initial boiling point of the solvent, in degrees Fahrenheit, for solvents that do not form 

azeotropes with water, or 50 percent of the initial boiling point, in degrees Fahrenheit, for 

solvents that form azeotropes with water; and 

e. A superheated vapor zone where parts remain in the vapor zone for at least the minimum 

dwell time, as specified by the manufacturer. The temperature within the superheated 

vapor zone shall be at least 10 degrees Fahrenheit above the initial boiling point of the 

solvent being used. 

K. Additional Equipment Requirements for Conveyorized In-Line Cold CleanersCleaning Machines. In 

addition to the requirements specified in Rule 321 Section G, conveyorized Any person who owns, 

operates, or uses any batch in-line cold cleaners cleaning machine shall ensure that it is be equipped with 

the following: 

1. A rotating basket, tumbling basket, drying tunnel, or other means that prevents cleaned parts from 

carrying out solvent liquid or vapor. 

2. Openings such that Tthe average clearance between workload material and the edges of the 

cleaner solvent cleaning machine entrance and exit openings shall be less than 10 centimeters 

(3.94 inches) or less than 10 percent of the opening width, whichever is less. 

3. Down-time mode covers for closing off the entrance and exit during shutdown hours, or an 

equivalent device that cover at least 90 percent of the opening. A continuous web part that 
Santa Barbara County APCD Rule 321 321 - 21 September 18, 1997[date of amended rule adoption]

completely occupies an entry and exit port when the machine is idle is considered to meet this 

requirement. 

4. A Dimensions such that the freeboard ratio of is 0.75 or greater that is physically verifiable. 

 

5. In lieu of the freeboard ratio required by Rule 321 Section K.4, use of an emission control system 

that meets the requirements of Section MN may be used. 

6. Effective [one year from the date of amended rule adoption], except when using an emission 

control system that meets the requirements of Section N, solvent that contains 50 grams of 

reactive organic compound per liter of material or less. 

L. Additional Equipment Requirements for Conveyorized In-Line Vapor Solvent CleanersCleaning 

Machines. In addition to the requirements specified in Rule 321 Section G, conveyorized Any person who 

owns, operates, or uses any in-line vapor solvent cleaners cleaning machine shall ensure that it is be 

equipped with the following: 

1. A rotating basket, tumbling basket, drying tunnel, or other means that prevents cleaned parts from 

carrying out solvent liquid or vapor. 

2. Openings such that Tthe average clearance between workload material and the edges of the 

cleaner solvent cleaning machine entrance and exit openings shall be less than 10 centimeters 

(3.94 inches) or less than 10 percent of the opening width, whichever is less. 

3. Idling and Ddown-time mode covers for closing off the entrance and exit during shutdown hours, 

or an equivalent device that cover at least 90 percent of the opening. A continuous web part that 

completely occupies an entry and exit port when the machine is idle is considered to meet this 

requirement. 

4. A primary condenser coil situated above the boiling solvent. 

5. A condenser flow switch that automatically shuts off the sump heater if the condenser coolant 

stops circulating or becomes warmer than its designed operating temperature. 

6. A high vapor level cutoff thermostat control device that automatically shuts off the sump heater 

when if the solvent vapor level in the vapor cleaning machine rises above the designed operating 

level height of the primary condenser. 

7. For degreasers solvent cleaning machines with solvent flow, a device such as a spray pump 

control switch device that prevents the solvent flow pump operation unless the solvent vapor level 

is at the designed operating level. 

8. A device that automatically shuts off the sump heat if the sump liquid solvent level drops to the 

sump heater coils. 

89. A Dimensions such that the freeboard ratio of is 0.75 or greater that is physically verifiable. 

Effective [one year from the date of amended rule adoption], the unit shall have dimensions such 

that the freeboard ratio is 1.0 or greater.

910. In lieu of the freeboard ratio required by Rule 321 Section L.89, one of the following shall may be 

met: 

a. A refrigerated freeboard chiller freeboard refrigeration device for which the chilled air 

blanket temperature (expressed in degrees Fahrenheit) at the coldest point on the vertical 

axis in the center of the air-vapor interface air blanket shall be no greater than 30 percent 

of the initial boiling point (expressed in degrees Fahrenheit) of the solvent used or no 
Santa Barbara County APCD Rule 321 321 - 22 September 18, 1997[date of amended rule adoption]

greater than 40 degrees Fahrenheit. If the chiller operates below 32 degrees Fahrenheit, it 

shall be equipped with an automatic defrost; or 

b. An emission control system that meets the requirements of Rule 321 Section M N shall 

be used. 

 

11. Effective [one year from the date of amended rule adoption], except when an emission control 

system that meets the requirements of Section N is employed, when using solvent containing in 

excess of 50 grams of reactive organic compound per liter of material: 

a. A circumferential trough; 

b. A water separator (not required for solvents that form azeotropes with water); 

c. A freeboard refrigeration device that is operated such that the chilled air blanket 

temperature, measured at the center of the air blanket, is no greater than 40 percent of the 

initial boiling point of the solvent, in degrees Fahrenheit, for solvents that do not form 

azeotropes with water, or 50 percent of the initial boiling point, in degrees Fahrenheit, for 

solvents that form azeotropes with water; and 

d. A superheated vapor zone where parts remain in the vapor zone for at least the minimum 

dwell time, as specified by the manufacturer. The temperature within the superheated 

vapor zone shall be at least 10 degrees Fahrenheit above the initial boiling point of the 

solvent being used. 

M. Requirements - Solvent Cleaning.

Section M requirements apply to any person performing solvent cleaning, including, but not limited to, use 

of wipe cleaning cloths, cotton swabs, dabber bottles, hand-held spray bottles, squirt bottles, aerosol 

products, and the cleaning of application equipment. The following requirements become effective [one 

year from the date of amended rule adoption] and are in addition to the general operating requirements 

specified in Section D. 

1. Solvent Requirements. Except when using an emission control system that meets the 

requirements of Section N, no person shall use any solvent to perform solvent cleaning which 

exceeds the applicable grams of reactive organic compound per liter of material limit specified in 

Table 1. 

Table 1: Reactive Organic Compound Content Limits for Solvent Cleaning 

SOLVENT CLEANING ACTIVITY 

ROC Limit, 

grams of ROC per liter of 

material 

(pounds of ROC per gallon1)

(a) Product Cleaning During Manufacturing Processes and Surface Preparation for Coating 

Application:

 (i) General 50 

(0.42) 

(ii) Electrical Apparatus Components & Electronic 

Components 

900 

(7.51) 

(iii) Medical Devices & Pharmaceuticals 900 

(7.51) 

 

1

 English units are provided for information only.
Santa Barbara County APCD Rule 321 321 - 23 September 18, 1997[date of amended rule adoption]

SOLVENT CLEANING ACTIVITY 

ROC Limit, 

grams of ROC per liter of 

material 

(pounds of ROC per gallon1)

(iv) Silicone Manufacturing 900 

(7.51) 

(b) Repair Cleaning and Maintenance Cleaning:

 (i) General 50 

(0.42) 

(ii) Electrical Apparatus Components & Electronic 

Components 

900 

(7.51) 

(iii) Medical Devices & Pharmaceuticals:

 (I) Tools, Equipment, & Machinery 900 

(7.51) 

(II) General Work Surfaces 900 

(7.51) 

(iv) Silicone Manufacturing 900 

(7.51) 

(c) Cleaning of Coatings Application Equipment 950 

(7.93) 

(d) Cleaning of the Following Items and Equipment and their 

Components: 

 (i) Aerospace Vehicles; 

 (ii) Aerospace Vehicle Payloads and Satellites; 

(iii) Aerospace Vehicle, Aerospace Vehicle Payload, and 

Satellite: 

 (I) Transport Equipment (e.g., railcars, trucks, 

trailers, forklifts, and containers), and 

(II) Support Processing Equipment (e.g., clean rooms, 

tools, payload fairing fixtures, alignment jigs, fuel 

and oxidizer loading carts and associated transfer 

lines). 

900 

(7.51) 

2. Cleaning Devices and Methods. Except for solvent cleaning of spray application equipment, any 

person performing solvent cleaning with a solvent containing more than 50 grams per liter of 

material shall use one or more of the following cleaning devices or methods: 

a. Wipe cleaning where solvent is dispensed to wipe cleaning materials from containers that 

are kept closed to prevent evaporation, except while dispensing solvent or replenishing 

the solvent supply; 

b. Application of solvent from hand-held spray bottles, squirt bottles, or other closed 

containers with a capacity of one liter or less; or 

c. Non-atomized solvent flow, dip, or flush method where pooling on surfaces being 

cleaned is prevented or drained, and all solvent runoff is collected in a manner that 

enables solvent recovery or disposal. The collection system shall be kept closed to 

prevent evaporation except while collecting solvent runoff or emptying the collection 
Santa Barbara County APCD Rule 321 321 - 24 September 18, 1997[date of amended rule adoption]

system. 

3. Solvent Cleaning of Spray Application Equipment. Any person cleaning spray application 

equipment with a solvent containing more than 50 grams of reactive organic compound per liter of 

material shall use an enclosed system, or equipment that is proven to the satisfaction of the 

Control Officer to be equally effective as an enclosed system at controlling emissions. If an 

enclosed system is used, it shall totally enclose spray guns, cups, nozzles, bowls, and other parts 

during washing, rinsing and draining procedures, and it shall be used according to the 

manufacturer’s recommendations and be closed when not in use. 

MN. Emission Control System Requirements. Any person who owns, operates, or uses any emission control 

system required by owning or operating a solvent cleaner subject to this rule may use Sections D.9, G.8, or 

T.2.b.4) an emission control system or as an alternative compliance method as provided for in this rule to 

Rule 321 Sections D.9, G.8, H.6.b, I.5.b, J.8, K.5, or L.9.b, provided thatshall ensure that the following 

requirements are met: 

1. The overall efficiency (the capture system efficiency multiplied by the emission control device 

efficiency) of the total system shall not be less than 85 percent by weight in reducing total reactive 

organic compound and toxic air contaminant emissions. 

2. When using a carbon adsorption adsorber, the system exhaust shall be no more than 25 parts per 

million of solvent reactive organic compound by volume, calculated as carbon, over a complete 

adsorption cycle, 

3. The emission collection system shall have a ventilation rate between 15 to 20 cubic meters per 

minute per square meter of air-vapor or air-solvent solvent/air interface area (49.2 to 65.6 cubic 

feet per minute per square feet of air-vapor or air-solvent solvent air interface surface area), unless 

otherwise required to meet a National Institute for Occupational Safety and Health standard. 

4. An application for installation of the emission control equipment is submitted and the Control 

Officer grants an Authority to Construct for the equipment. 

5. An initial source test is accomplished by [one year from the date of amended rule adoption] or a 

later deadline established in an Authority to Construct to demonstrate compliance with the overall 

efficiency of the total system and/or the 25 parts per million reactive organic compound by 

volume limits of this rule. 

6. Compliance through the use of an emission control system will not result in reactive organic 

compound emissions in excess of the reactive organic compound emissions which would result 

from compliance with Sections H.7, I.7, K.6, or M.1. 

O. Alternative Operating and Equipment Requirements for an Airless Solvent Cleaning Machine or an 

Air-Tight Solvent Cleaning Machine. In lieu of meeting the requirements of Sections E through L, any 

person may use an airless solvent cleaning machine or air-tight solvent cleaning machine provided all of 

the following requirements are met:

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.

2. No pressure relief device shall allow liquid solvent to drain out. 

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

4. A list of operating requirements shall be legible and conspicuously posted or maintained on or 

near the equipment in such a manner that it is conveniently available to the operator for reference 

purposes. 
Santa Barbara County APCD Rule 321 321 - 25 September 18, 1997[date of amended rule adoption]

NP. Test Methods.

Any person who owns, operates, or uses any solvent cleaning machine or performs any solvent cleaning 

shall comply with the following test methods:

1. The reactive organic compound content of solvents shall be measured by the Environmental 

Protection Agency Reference Method 24 (40 CFR, Part 60, Appendix A-7). 

2. The initial boiling point of solvents shall be determined by ASTM D- 1078-8605, "Standard Test 

Method for Distillation Range of Volatile Organic Liquids.," ASTM International. 

3. The capture system efficiency shall be determined in accordance with the Environmental 

Protection Agency method described in 40 CFR, §52.741(a)(4)(iii) when the emission control 

system is used for reducing emissions of reactive organic compounds. For emission control 

systems handling compounds that are toxic air contaminants but not reactive organic compounds, 

the capture system efficiency shall be determined by using the same aforementioned method 

modified in a manner approved by the Control Officer to quantify the mass of liquid or gaseous 

reactive organic compounds and/or toxic air contaminants. 

4. The emission control device efficiency shall be determined pursuant to the Environmental 

Protection Agency method described in 40 CFR, §52.741(a)(4)(iv). and 40 CFR, 

§52.741(a)(4)(vi), when the emission control system is used for reducing emissions of reactive 

organic compounds. For emission control systems handling any compound that is a toxic air 

contaminant but not a reactive organic compound, the emission control device efficiency shall be 

determined using: 

a. an Environmental Protection Agency approved test method or methods, or 

b. in the case where there is no Environmental Protection Agency approved test method, a 

Control Officer approved detection method applicable for each target toxics specie. 

c. Several Environmental Protection Agency and/or Control Officer approved test methods 

on the emission control device efficiency may need to be employed to demonstrate that 

the emission control system overall efficiency is at least 85 percent by weight in reducing 

emissions of reactive organic compounds and/or toxic air contaminants. In addition, 

techniques to convert “parts per million by volume” test method results to 1) “parts per 

million by weight” and/or 2) “mass emission rates” (e.g., pounds per hour) shall be 

approved by the Control Officer. 

5. The volumetric flowrate shall be determined in accordance with the Environmental Protection 

Agency Methods 2, 2A, 2C, and 2D, 2F, or 2G (40 CFR, Part 60, Appendix A-1). 

6. The average workroom draft rate shall be measured parallel to the plane of the degreaser solvent 

cleaning machine opening with a thermistor anemometer with an accuracy within ± 2 feet per 

minute and a calibration pursuant to the National Institute of Standards and Technology. 

7. The identity of components in solvents shall be determined using manufacturer’s formulation data 

or by using ASTM E 168-6706, “Standard Practices for General Techniques of Infrared 

Quantitative Analysis,” ASTM International, ASTM E 169-8704, “Standard Practices for General 

Techniques of Ultraviolet-Visible Quantitative Analysis,” ASTM International, or ASTM E 260-

8596 (2006), “Standard Practice for Packed Column Gas Chromatography,” ASTM International. 

8. Emissions of ROC reactive organic compounds from the exhaust of an emission control system 

shall be measured by the appropriate EPA Environmental Protection Agency Method 18 or 25, or, 

if applicable, 25A or 25B may be used (40 CFR, Part 60, Appendix A-7), with gas 
Santa Barbara County APCD Rule 321 321 - 26 September 18, 1997[date of amended rule adoption]

chromatography-flame ionization detection speciation analysis for C1, C2, C3, C4, C5, C6+ 

species. Alternatively, the Environmental Protection Agency Method 25 or 25A in combination 

with Method 18 may be used. 

OQ. Operational and Maintenance Plan. Any person proposing to use an emission control device to comply 

with this rule pursuant to Rule 321 Section M N shall submit, with the Authority to Construct application, 

an emission control device Operation and Maintenance Plan to the Control Officer for approval. Owners or 

operators of emission control devices installed as of July 17, 1997, if not previously submitted, shall submit 

Operation & Maintenance Plans by January 17, 1998 and obtain approval of the plan by the Control 

Officer. The Operation and Maintenance Plan shall specify: 

1. operation and maintenance procedures of emissions-producing operation, and 

2. which records shall be kept to document these operation and maintenance procedures. 

3. In addition, These these records shall comply with the requirements of Rule 321 Section PR.1.c 

and P.3R.3. The Operation and Maintenance Plan shall be implemented upon approval of the 

Control Officer. 

PR. Recordkeeping Requirements.

1. Any person holding a permit forwho owns, operates, or uses a solvent cleaner cleaning machine or 

performs solvent cleaning that is subject to this rule shall comply with the following requirements: 

a. Record and Mmaintain and have available on site solvent manufacturer specification 

sheets that show the following information for each solvent: 

1) Type of solvent (chemical or manufacturer's product name).Brand name, stock 

identification number, and generic product class for each solvent used during the 

month at the stationary source.

2) The solvent initial boiling point.Material safety data sheets for each material 

listed in response to Section R.1.a.1). 

3) Purchase records for each material listed in response to Section R.1.a.1).

b. Record each quarter the following information for the stationary source: 

1) The total volume of make-up solvent used, itemized by each solvent's chemical 

or manufacturer's product name. If the solvent is a mix of materials blended by 

the operator, the mix ratio by each solvent's chemical or manufacturer's product 

name shall be recorded.On a monthly basis, the total monthly volume (gallons) 

usage and reactive organic compound content (grams per liter or pounds per 

gallon of reactive organic compound) for each material listed in response to 

Section R.1.a.1). 

2) The date Records confirming compliance with the acceptable disposal methods 

listed in Section D.1, each time waste solvent or waste solvent residue is 

removed from the facility stationary source for disposal. 

3) For solvent cleaning, the type of cleaning activity for each solvent used at the 

stationary source in accordance with the cleaning categories specified in Table 1 

of this rule.

4) For each solvent cleaning machine: 
Santa Barbara County APCD Rule 321 321 - 27 September 18, 1997[date of amended rule adoption]

i. Type of solvent cleaning machine. 

ii. Brand name of each solvent used in the solvent cleaning machine and 

the reactive organic compound content of each solvent, as used. 

iii. The solvent(s) initial boiling point. 

5) When the solvent used is a mixture of different materials that are blended by the 

operator, the mix ratio of the batch shall be recorded and the reactive organic 

compound content of the batch shall be calculated and recorded in order to 

determine compliance with the specified limits of reactive organic compound 

content, as applied. 

c. If using an emission control system pursuant to Rule 321 Section M N as a means of 

complying with this rule, the person shall maintain such records as required by the 

Operation and Maintenance Plan in Section O Q on a daily basis. Key operating 

parameters and other information necessary to verify compliance with the required 

overall efficiency of the total system, as specified in Section N.1, shall be recorded. 

These parameters shall include, but not be limited to: 

1) Hours of operation; 

2) All maintenance work that requires the emission control system to be shut down; 

3) All information needed to demonstrate continuous compliance with Section N, 

such as temperatures, pressures, and/or flow rates. 

2. Any person claiming an exemption from Rule 321, pursuant to Section B.2.b, shall record each 

quarter the following information for the stationary source: the aggregate evaporative surface area 

of all solvent cleaners subject to the Rule 321 Section B.2.b exemption claim.

32. In addition to the records required by Section R.1, any person claiming the Section B.9 exemption 

or the Section B.15 exemption, shall maintain records in order to demonstrate compliance with the 

solvent usage rate aggregate limits. For Section B.9 exemption claims, daily records on a facility 

basis shall be maintained. For Section B.15 exemption claims, monthly and calendar year total 

records on a stationary source basis shall be maintained. 

3. Maintain the Rrecords kept pursuant to this section rule shall be maintained on site for at least 2 3 

years. Thereafter, the records shall be maintained such records either on site or readily available 

for expeditious inspection and review for an additional 3 2 years. 

QS. Reporting Requirements

Any person holding a permit for a solvent cleaner cleaning machine or solvent cleaning subject to the 

requirements of this rule shall submit an annual report to the Control District. At a minimum, Tthe annual 

report shall contain the quarterly monthly records required by Rule 321 Section PR.1.b.1), the annual totals 

based on each of the solvent’s monthly data, the name and address of the Permittee, and the Permit to 

Operate number that the solvent cleaning machine and/or solvent cleaning is subject to. The report shall be 

due March 1 for the previous calendar year. 

RT. Compliance Schedule

Any person who owns, operates, or uses any solvent cleaning machine or performs any solvent cleaning 

subject to this rule shall meet the following compliance schedule: 

1. New solvent cleaning machines and solvent cleaning operations: 
Santa Barbara County APCD Rule 321 321 - 28 September 18, 1997[date of amended rule adoption]

Commencing [date of amended rule adoption], any new solvent cleaning machine shall comply 

with this rule the first time it is operated in the District. Also commencing [date of amended rule 

adoption], any new solvent cleaning shall comply with this rule the first time it is performed in the 

District. 

2. Existing solvent cleaning machines: 

a. For any solvent cleaning machine previously subject to the Rule 321 adopted on 

September 18, 1997, commencing [date of amended rule adoption], the owner or 

operator shall ensure that the equipment complies with the applicable provisions of Rule 

321. The provisions in Sections H.7, I.7, J.8, J.11, K.6, L.9, and L.11 have an effective 

date of [one year from the date of amended rule adoption]. 

b. For any solvent cleaning machine previously exempt from the September 18, 1997 

amended Rule 321 that lost its exemption by the adoption of amended Rules 102 

(Definitions), 202 (Exemptions to Rule 201), and/or Rule 321 on [date of amended rule 

adoption], the owner or operator of such equipment shall comply with the following: 

1. The owner or operator of any solvent cleaning equipment in operation as of July 17, 1997 and 

subject to the requirements of this rule shall comply with the following: 

a. 1) By August 16, 1997[30 days from the date of amended rule adoption], be in full 

compliance with the applicable operating requirements of Rule 321 Sections D, 

E, and F. 

b. 2) By January 13, 1998[180 days from the date of amended rule adoption], be in 

full compliance with the applicable recordkeeping and reporting provisions of 

Rule 321 Sections P R and QS. 

c. 3) By July 17, 1998[365 days from the date of amended rule adoption], be in full 

compliance with the applicable equipment requirements of Rule 321 Sections G, 

H, I, J. K, L, and MN. 

d. 4) Notwithstanding Rule 321 Section R.1.c, the provisions of Section G.8 shall 

take effect on July 17, 1997.Any lip exhaust installed after [date of amended 

rule adoption] shall be vented to an emission control system that meets the 

requirements of Section N at the time of installation, notwithstanding the date in 

Sections G.8 and T.2.b.3. 

2. This rule applies to any new or modified solvent cleaning equipment on July 17, 1997. 

3. Existing solvent cleaning operations: 

The owner or operator of any facility performing solvent cleaning as of [date of amended rule 

adoption] and subject to the requirements of this rule shall comply with the following: 

a. By [30 days from the date of amended rule adoption], be in full compliance with the 

applicable operating requirements of Section D. 

b. By [180 days from the date of amended rule adoption], be in full compliance with the 

applicable recordkeeping and reporting provisions of Sections R and S. 

c. By [365 days from the date of amended rule adoption], be in full compliance with the 

solvent cleaning requirements of Rule Section M.