VENAPCD RULE 23 EXEMPTIONS FROM PERMIT

LAST REVISED 03/22/94

Rule 23. Exemptions from Permit (Adopted 10/22/68,

Revised 5/23/72, 7/18/72, 8/26/74, 3/9/76, 6/14/77,

1/17/78, 6/20/78,11/21/78, 6/17/80, 5/5/81, 7/2/85,

10/21/86, 11/22/88, 5/16/89,6/20/89, 6/27/89, 9/12/89,

5/8/90, 1/8/91, 7/16/91, 1/28/92, 6/8/93, 3/22/94)

The following operations, equipment or emission sources are

exempt from requiring a permit, but must comply with emission

standards and prohibitions except as exempted in Rule 55. The

applicant shall provide calculations and/or operational data as

necessary to substantiate any exemptions which apply to the

subject facility and as may be required by the District to

substantiate such exemption.

A. Burning, Incineration, Smoke

1. Open outdoor fires used only for recreational

purposes, heating or occasional cooking of food for

human consumption, where such use is accomplished in a

fireplace or barbecue pit.

2. Smoke generators which are intentionally operated for

purposes of training observers in observing the shade

or opacity of emissions.

3. Acceptable incinerators used exclusively in

connection with any structure designed and used

exclusively as a residential dwelling for not more than

four (4) families. (Revised 5/23/72)

4. Safety flares exclusively used for emergency standby

for the disposal of process gases in the event of

unavoidable process upsets. (Adopted 6/14/77)

B. Dust

1. Material stock piles.

2. Blasting with explosives.

3. Mobile equipment which is used solely for the

movement of solid materials. (Revised 5/23/72)

4. Equipment used for buffing (except automatic or semi-

automatic tire buffers), polishing, carving, cutting,

drilling, machining, routing, sanding, sawing, surface

grinding or turning of ceramic artwork, ceramic

precision parts, leather, metals, plastics, rubber,

fiberboard, masonry, carbon or graphite.

5. Equipment used for carving, cutting, drilling,

surface grinding, planing, routing, sanding, sawing,

shredding, or turning of wood or paper, or the pressing

or storing of sawdust, wood chips or wood shavings.

6. Blast cleaning equipment using a suspension of

abrasives in water.

7. Abrasive blast cabinet-dust filter integral

combination units where the total internal volume of

the blast section is 50 cubic feet or less.

8. Batch mixers of 5 cubic feet rated working capacity

or less.

9. Tumblers used for the cleaning or deburring of metal

products without abrasive blasting.

10. Lint traps used exclusively in conjunction with dry

cleaning tumblers.

11. Laundry dryers, extractors or tumblers used for

fabrics cleaned only with water solutions of bleach or

detergents.

C. Heaters, Boilers

1. Space heating and heat transfer equipment rated at

less than one million BTU/s per hour. (Revised

6/14/77)

2. Equipment rated at less than one million BTUs per

hour and used exclusively for steam cleaning. (Revised

6/20/89)

3. Natural draft hoods, natural draft stacks or natural

draft ventilators.

D. Vehicles, Engines

1. Aircraft and vehicles as defined by the Vehicle Code

of the State of California, and the filling of fuel

tanks attached to such equipment but not including any

equipment mounted on such vehicle that would otherwise

come under the jurisdiction of these Rules and

Regulations.

2. Vehicles used to transport passengers or freight.

3. Self-powered vehicular mounted concrete mixing units.

4. Internal combustion engines and turbines used

exclusively for frost protection or emergency service.

(Revised 6/19/80)

5. Piston driven internal combustion engines used for

oil well work-over operations, for driving air pumps at

sewage treatment facilities, or for driving irrigation

pumps. (Adopted 6/20/78, Revised 5/5/81, 1/8/91)

6. Internal combustion engines having a maximum design

power rating of less than 50 brake horsepower.

(Adopted 6/20/78, Revised 7/2/85)

7. Piston driven internal combustion engines which are

operated less than 200 hours per year, and which are

used only to provide emergency electrical power or for

emergency pumping of water.

8. Piston driven internal combustion engines used in oil

drilling rigs in emergencies to drill relief wells.

E. Food Preparation, Processing, Household

1. Equipment used in connection with any structure

designed and used exclusively as a residential

dwelling.

2. Equipment and processing plant equipment used

exclusively and directly for the purpose of preparing

food for human consumption where no organic solvents

are used.

3. Vacuum cleaning systems used exclusively for

industrial, commercial, institutional or residential

housekeeping purposes.

4. Comfort air conditioning or ventilating systems which

are not designed to remove air contaminants generated

by or released from specific units of equipment.

5. Refrigeration units except those used as, or in

conjunction with, air pollution control operations.

F. Gaseous Reactive Organic Compound Emissions

1. Storage in or loading into any tank having a capacity

of 550 gallons or less which is equipped with a

submerged fill pipe and is not required to have a vapor

recovery system. (Revised 11/22/88)

2. Equipment for loading and storing of a reactive

organic compound liquid into any stationary storage

tank having a capability of holding 250 gallons or

less. (Revised 5/23/72)

3. Equipment for loading of reactive organic compound

liquid into transportable containers of 100 gallons or

less.

4. Equipment for loading of a maximum of 500 gallons per

calendar day or less of reactive organic compound

liquid into transportable containers.

5. Containers for the storage of unheated asphalt.

(Revised 5/23/72)

6. Until June 12, 1990; unheated solvent dispensing

containers, unheated non-conveyorized solvent rinsing

containers, or unheated non-conveyorized coating dip

tank of 100 gallons capacity or less.

Effective June 12, 1990; any of the following solvent

cleaning equipment or operations:

a. Non-conveyorized degreasers which use unheated

solvent and which have a liquid surface area of

less than 929 square centimeters (1 square foot).

b. Non-conveyorized degreasers which use unheated

solvent with an initial boiling point greater than

150 oC (302 oF) and which have a liquid surface

area of less than 1 square meter (10.8 square

feet).

c. Degreasing equipment at any stationary source

where less than 25 gallons of solvent per year are

lost to the atmosphere from all such equipment.

Solvent lost shall not include solvent that is

recycled or disposed of properly. Any person

claiming exemption pursuant to this subsection

shall maintain adequate monthly records to

substantiate their exempt status.

d. Wipe cleaning operations at any stationary

source where less than 25 gallons of solvent per

year are lost to the atmosphere from such

operations. Solvent lost shall not include

solvent that is recycled or disposed of properly.

Any person claiming exemption pursuant to this

subsection shall maintain adequate monthly records

to substantiate their exempt status.

7. Equipment for melting and applying coatings of oils,

waxes, greases, resins, and like substances where no

reactive organic solvents, diluents or thinners are

used.

8. Equipment used exclusively for the manufacture of

water emulsions of asphalt, greases, oils or waxes or

the manufacture of waterbased adhesives or waterbased

paints.

9. Equipment used to compress, store, liquefy or

separate gases from the air or to compress or store

natural hydrocarbon gases, other than engines.

(Revised 5/23/72)

10. Equipment used exclusively to mill or grind coatings

and molding compounds where all materials charged are

in a paste form.

11. Stationary sources, other than motor vehicle or

mobile equipment coating operations, emitting not more

than 3 pounds of ROC per day and not more than 200

pounds of ROC per year from surface coating operations

including coatings, thinners, or any other solvent

containing materials.

Effective July 28, 1992, any motor vehicle or mobile

equipment coating operation where only hand-held,

nonrefillable aerosol cans, 16 ounces or less (net

weight) are used (Adopted 6/14/77, Revised 5/16/89,

1/28/92).

12. Any tank or container which is used to hold or store

reactive organic compound liquids, except gasoline and

crude oil, and which is not required to have reactive

organic compound vapor emission controls.

13. Adhesive and sealant operations emitting not more

than 200 pounds of ROC per rolling period consisting of

12 consecutive calendar months from adhesives,

sealants, adhesive primers, solvents, and aerosol spray

products (Adopted 6/8/93).

G. Experimental Operations

Bench scale experimental or research operations and

equipment used exclusively for investigation,

experimentation or research to advance the state of air

pollution control knowledge or to improve techniques,

provided however, the Air Pollution Control Officer has

given express prior approval which shall include limitation

of time. (Revised 5/23/72)

H. Plastics and Rubber

1. Presses used for the curing of rubber products and

plastic products.

2. Ovens used exclusively for the curing of plastics

which are concurrently being vacuum held to a molt or

for the softening or annealing of plastics.

3. Equipment used for compression molding or injection

moulding of plastics.

4. Mixers for rubber or plastics where no material in

powder form is added and no organic solvents, diluents

or thinners are used.

5. Ovens used exclusively for the curing of vinyl

plastisols by the closet mold curing process.

6. Roll mills or calender for rubber or plastics where

no organic solvents, diluents or thinners are used.

7. Ovens used exclusively for curing potting materials

or castings made with epoxy resins.

8. Equipment used exclusively for conveying and storing

plastic pellets.

I. Metals and Ceramics

1. Porcelain enameling furnaces, porcelain enameling

drying ovens, vitreous enameling furnaces or vitreous

enameling drying ovens of one million BTU/s per hour or

less heat input. (Revised 5/23/72)

2. Kilns used for firing ceramic ware of one million

BTU/s per hour or less heat input. (Revised 6/14/77)

3. Equipment used exclusively for heat treating or

sintering glass or metals or for case hardening metals

of one million BTU/s per hour or less heat input.

(Revised 5/23/72)

4. Presses used exclusively for extruding metals,

minerals, plastics or wood where no heat is applied.

(Revised 5/23/72)

5. Equipment used for hydraulic or hydrostatic testing.

6. Equipment used for inspection of metal products.

7. Brazing, soldering or welding equipment.

8. Molds used for the casting of metals.

9. Equipment using dilute aqueous solutions for surface

preparation, cleaning, stripping, etching (does not

include chemical milling) or the electrolytic plating,

electrolytic polishing or the electrolytic stripping of

brass, bronze, cadmium, copper, iron, lead, nickel,

tin, and zinc. This exemption does not apply to chrome

plating or chromic acid anodizing. (Revised 5/23/72,

6/27/89)

10. Equipment used for washing or drying products

fabricated from metal or glass, provided that no

volatile organic materials are used in the process and

that no oil or solid fuel is burned.

11. Crucible furnaces, pot furnaces, or induction

furnaces, with a capacity of 1000 pounds or less each

with fail-safe temperature controllers preventing vapor

boil-off, in which no sweating or distilling is

conducted and from which only the following metals are

poured or in which only the following metals are held

in a molten state. (Revised 5/23/72)

a. Aluminum or any alloy containing over 50 percent

aluminum.

b. Magnesium or any alloy containing over 50

percent magnesium.

c. Lead or any alloy containing over 50 percent

lead.

d. Tin or any alloy containing over 50 percent tin.

e. Zinc or any alloy containing over 50 percent

zinc.

f. Copper

g. Precious metals

12. Crucible furnaces, pot furnaces or induction

furnaces with a brimful capacity of less than 450 cubic

inches of any molten metal. (Revised 6/14/77)

J. Miscellaneous

1. Bench scale laboratory equipment used exclusively for

chemical or physical analyses or experiments. (Revised

6/14/77)

2. Vacuum producing devices in laboratory operations or

in connection with other equipment which is exempt by

this Rule.

3. Graphic arts operations (packaging gravure,

publication gravure, flexographic printing, screen

printing, letterpress, lithographic printing, or ink

jet printing) with total facility emissions from

graphic arts operations of not more than 200 pounds of

ROC per rolling period of 12 consecutive calendar

months from inks, coatings, fountain solutions,

solvents, and adhesives used for the binding of books

or periodicals. Solvents shall include ink additives

and materials used for the clean-up of graphic arts

equipment. (Revised 5/23/72, 3/22/94)

4. Photographic process equipment by which an image is

reproduced upon material sensitized to radiant energy.

5. Equipment used exclusively to package pharmaceuticals

or cosmetics or to coat pharmaceutical tablets.

6. Shell-core and shell-mold manufacturing machines.

7. Die casting machines.

8. Equipment used exclusively for bonding lining to

brake shoes.

9. Valves and flanges.

10. Cooling towers and ponds.

11. Equipment used exclusively for the dyeing or

stripping (bleaching) of textiles where no organic

solvents, diluents, thinners or sulfur compounds are

used.

12. Any article, machine, equipment, contrivance or

their exhaust systems, the discharge from which

contains airborne radioactive materials and which is

emitted into the atmosphere in concentrations above the

natural radioactive background concentration in air.

"Air-borne radioactive material" means any radioactive

material dispersed in the air in the form of dusts,

fumes, smoke, mists, liquids, vapors or gases.

Atomic energy development and radiation protection are

controlled by the State of California to the extent it

has jurisdiction thereof, in accordance with the advice

and recommendations made to the Governor by the

Advisory Council on Atomic Energy Development and

Radiation Protection. Such development and protection

are fully regulated by the United States Atomic Energy

Commission to the extent that such authority has not

been delegated to the states.

13. Repairs, including the replacement of worn or

defective parts, to any article, machine, equipment or

other contrivance where a Permit to Operate had

previously been granted for such equipment, so long as

such repairs do not constitute a substantial

replacement of the equipment as a whole. (Revised

1/17/78)

14. Any sterilizer or aerator at a stationary source

where the amount of ethylene oxide charged to all

sterilizers at the stationary source is no more than 4

pounds per year (lb/yr).

Until July 16, 1993, any sterilizer or aerator at a

stationary source where the amount of ethylene oxide

charged to all sterilizers at the stationary source is

greater than 4 lb/yr but no greater than 600 lb/yr.

Until January 16, 1993, any aerator at a stationary

source where materials which been sterilized with

ethylene oxide at another stationary source are

aerated.

Until January 16, 1993, any sterilizer or aerator at a

stationary source where the amount of ethylene oxide

charged to all sterilizers at the stationary source is

greater than 600 lb/yr but no greater than 5,000 lb/yr.

Until July 16, 1992, any sterilizer or aerator at a

stationary source where the amount of ethylene oxide

charged to all sterilizers at the stationary source is

greater than 5,000 lb/yr.