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RULE 2020 EXEMPTIONS (Adopted September 19, 1991; Amended July 16, 1992; Amended

December 17, 1992; Amended October 21, 1993; Amended July 21, 1994;

Amended September 17, 1998; Amended June 21, 2001; Amended March 21, 2002;

Amended December 19, 2002.)

1.0 Purpose

This rule specifies emissions units that are not required to obtain an Authority to Construct

or Permit to Operate. This rule also specifies the recordkeeping requirements to verify the

exemption and outlines the compliance schedule for emissions units that lose the exemption

after installation.

2.0 Applicability

This rule shall apply to any source that emits or may emit air contaminants.

3.0 Definitions

3.1 Clean Produced Water: as defined in Rule 1020.

3.2 Emissions Unit: as defined in Rule 2201.

3.3 HAP: a hazardous air pollutant listed in Section 112(b) of the federal Clean Air

Act or the lists prepared by the California Air Resources Board pursuant to Section

44321 of the California Health and Safety Code that have OEHHA approved health

risk values.

3.4 HAP Source: an emissions unit that is subject to an emissions limitation, a

performance standard, work practice standard, or other requirements under an

applicable provision of any of the following regulations:

3.4.1 National Emission Standards for Hazardous Air Pollutants (NESHAPS),

Maximum Achievable Control Technology (MACT) standard, or other

requirements promulgated pursuant to Section 112 of the federal Clean Air

Act (42 U.S. Code, 7401, et. seq.).

3.4.2 Airborne Toxic Control Measures (ATCM) adopted by the California Air

Resource Board in accordance with requirements of Section 39658 of the

California Health and Safety Code.

3.4.3 A rule contained in Regulation VII (Toxic Air Pollutants) of the District

Rules and Regulations.

3.5 Indirect heat transfer system: A heat transfer system in which the products of

combustion do not come into direct contact with the material being heated.
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3.6 Low Emitting Unit: An emissions unit with an uncontrolled emissions rate of each

air contaminant,

3.6.1 Less than or equal to two pounds per day or,

3.6.2 If greater than two pounds per day, is less than or equal to 75 pounds per

year.

3.7 NSPS Source: an emissions unit that is subject to an emissions limitation,

performance standard, work practice standard, or other requirements under an

applicable provision of 40 CFR, Part 60, New Source Performance Standards

(NSPS).

3.8 Portable Emissions Unit: as defined in Rule 2280.

3.9 Reconstructed Stationary Source: a Reconstructed Stationary Source as defined in

Rule 2201, or a Reconstruction as defined in 40 CFR Part 60 Subpart A.

3.10 Roadmix: a mixture of tank bottoms from crude oil storage tanks, material from

crude oil spills, or other crude-oil-containing soil mixed with aggregates and soils,

that is used as a base or cover material for roads, parking lots, berms, tank and

well locations, or similar applications.

3.11 Routine Replacement: as defined in Rule 2201.

3.12 Stationary Source: as defined in Rule 2201.

3.13 True Vapor Pressure: as defined in Rule 4623.

3.14 Unloading Rack: any aggregate or combination of equipment or control equipment

that unloads organic liquid into a storage tank from tank trucks, trailers, or railroad

tank cars. The unloading rack is the portion of the connection system from the

connection at the inlet of the organic liquid pump to and including the hose and

connector at the delivery tank.

4.0 Precluded Source Categories

No Authority to Construct or Permit to Operate shall be required for the following source

categories that are specifically precluded from District permitting requirements by state or

federal law:

4.1 Any structure designed for and used exclusively as a dwelling for not more than

four families and any incinerator used exclusively in connection with such structure

(Health and Safety Code Section 42310(b) and (c)).
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4.2 Barbecue equipment that is not used for commercial purposes, (Health and Safety

Code Section 42310(d)).

4.3 Motor vehicles as defined by the Vehicle Code of the State of California (Health

and Safety Code, Section 42310(a)), but not including any emissions unit mounted

on such vehicle, that would otherwise require a permit under the provisions of the

District Rules and Regulations.

4.4 Locomotives, airplanes, and watercraft used to transport passengers or freight. This

exemption is not intended to apply to equipment used for the dredging of waterways

or to equipment used in pile driving adjacent to or in waterways.

5.0 District Permit Exemptions

An Authority to Construct or Permit to Operate shall not be required for an emissions unit

covered under District Exempt Source Categories listed in Sections 6.0 or 7.0, unless one

or more of the following is true:

5.1 The source is a NSPS source;

5.2 The source is a HAP source;

5.3 The APCO makes a determination that a permit shall be required because the

source may not operate in compliance with all District rules and regulations; or

5.4 The owner specifically requests a Permit to Operate.

6.0 District Exempt Source Categories

Except as required by Section 5.0, no Authority to Construct or Permit to Operate shall be

required for an emission unit specified below. All other equipment within that source

category shall require an ATC or PTO.

6.1 Combustion and Heat Transfer Systems

6.1.1 Steam generators, steam superheaters, water boilers, water heaters, steam

cleaners, and closed indirect heat transfer systems that have a maximum

input heat rating of 5,000,000 Btu per hour (gross) or less and is equipped

to be fired exclusively with natural gas, liquefied petroleum gas, or any

combination thereof provided the fuel contains no more than five percent by

weight hydrocarbons heavier than butane (as determined by test method

ASTM E-260-73) and no more than 0.75 grains of total sulfur per 100

standard cubic feet of gas (as determined by test method ASTM D-1072-

80).
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6.1.2 Piston type internal combustion engines with a manufacturer's maximum

continuous rating of 50 braking horsepower (bhp) or less.

6.1.3 Gas turbine engines with a maximum heat input rating of 3,000,000 Btu per

hour or less at ISO Standard Day Conditions.

6.1.4 Equipment used exclusively for space heating, other than boilers.

6.1.5 Multiple chambered or equivalent incinerators used to destroy animals from

a wildlife habitat for the sole purpose of disease control, as authorized by a

public official.

6.2 Cooling Towers: Water cooling towers that have a circulation rate of less than

10,000 gallons per minute, and that are not used for cooling of process water, water

from barometric jets, or water from barometric condensers.

6.3 Graphic Arts Equipment: Printing, coating, or laminating facility with a total

graphic arts material usage of

6.3.1 Less than or equal to two gallons per any day or,

6.3.2 If greater than two gallons per day, is less than or equal to 30 gallons per

year.

6.3.3 Graphic arts materials are any ink, coating, adhesive, fountain solution,

thinner, retarder, or cleaning solution.

6.4 Food Processing Equipment

6.4.1 Equipment, excluding charbroilers subject to Rule 4692 and boilers, used in

eating establishments or other retail establishments for the purpose of

preparing food for human consumption.

6.4.2 Mixers and blenders used in bakeries where the products are edible and

intended for human consumption.

6.4.3 Ovens at bakeries provided that the total production from the bakery is less

than 1,000 pounds of product per operating day and the oven is fired solely

on natural gas and the oven has a rating less than 5 MMBtu per hour.

6.4.4 Smokehouses for preparing food in which the maximum horizontal inside

cross-sectional area does not exceed 20 square feet.

6.5 Plastic/Rubber Processing: Emissions units used exclusively for the extruding or

the compression molding of rubber products or plastics, where no plasticizer or

blowing agent is present.
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6.6 Storage Equipment: Containers, reservoirs, or tanks used exclusively for:

6.6.1 The storage or processing of clean produced water as represented in Figure

1 as being below the oil/water line.

6.6.2 The storage of crude oil with 0.8762 specific gravity or higher (30oAPI or

lower) as measured by test method API 2547 or ASTM D-1298-80, and

having a capacity of 100 bbl or less, and is not subject to a VOC control

requirement of Rule 4623.

6.6.3 The storage of crude oil with specific gravity lower than 0.8762 (greater

than 30oAPI) as measured by test method API 2547 or ASTM D-1298-80,

and existing before June 1, 1989, having a capacity of 100 bbl or less, and

is not subject to a VOC control requirement of Rule 4623. This exemption

shall not apply to a new tank installed after June 1, 1989.

6.6.4 The storage of organic material with a capacity of 250 gallons or less

where the actual storage temperature does not exceed 150oF.

6.6.5 The unheated storage of organic material with an initial boiling point of

302oF or greater as measured by test method ASTM D-86. 

6.6.6 The storage of fuel oils or non-air-blown asphalt with 0.9042 specific

gravity or higher (25oAPI or lower) as measured by test method API 2547

or ASTM D-1298-80. 

6.6.7 The storage of petroleum distillates used as motor fuel with 0.8251 specific

gravity of higher (40oAPI or lower) as measured by test method API 2547

or ASTM D-1298-80 and having a capacity of 19,800 gallons (471 bbl) or

less;

6.6.8 The storage of refined lubricating oils.

6.6.9 The storage of liquefied gases in unvented (except for emergency pressure

relief valves) pressure vessels.

6.6.10 The storage of produced fluids in portable tanks, to be used for less than six

months at any one (1) location and is not subject to a VOC control

requirement of Rule 4623.

6.6.11 Mobile transport, delivery, or cargo tanks on vehicles for delivery of

VOCs.

6.7 Transfer Equipment
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6.7.1 Loading Racks (as defined in Rule 1020 (Definitions)) and unloading racks

that are:

6.7.1.1 Used exclusively for the transfer of less than 4,000 gallons per

day of:

6.7.1.1.1 Unheated organic materials with an initial boiling point

of 302oF or greater as measured by test method ASTM

D-86, or

6.7.1.1.2 Fuel oil with 0.8251 specific gravity or higher (40oAPI

or lower) as measured by test method API 2547 or

ASTM D-1298-80.

6.7.1.2 Used exclusively for the transfer of:

6.7.1.2.1 Crude oil, asphalt, or residual oil stored in tanks not

required to be permitted in accordance with this rule; or

6.7.1.2.2 Crude oil with 0.8762 specific gravity or higher

(30oAPI or lower) as measured by test method API

2547 or ASTM D-1298-80.

6.7.1.3 Attached to an organic material delivery vehicle and used

exclusively for the transfer of crude oil, asphalt, or residual oil.

6.7.2 Equipment used exclusively for the transfer of refined lubricating oil.

6.8 Surface Coating Operations

6.8.1 Application equipment for architectural surface coatings used for

commercial or residential applications. Architectural surface coating is

defined as any coating applied to stationary structures and their

appurtenances, to mobile homes, to pavements, or to curbs. This exemption

does not apply to coating application equipment used in the manufacturing

of architectural components and appurtenances that are coated before their

installation as part of a structure.

6.8.2 Surface coating operations, except for powder coating operations, which

use less than one quart of coating per day or less than eight gallons of

coating per year.

6.8.3 Powder coating operations that use less than five pounds of coating material

per day or less than fifty pounds of coating material per year.

6.9 Solvent Cleaning Operations
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Unheated, nonconveyorized cleaning equipment (not including the control

enclosures): 

6.9.1 With an open surface area of 10.0 square feet or less, and internal volume

of 92.5 gallons or less;

6.9.2 Using only organic solvents with an initial boiling point of 248oF or greater

as determined by ASTM 1078-78; and

6.9.3 From which less than 25 gallons of solvent per year are lost to the

atmosphere from all such equipment at the stationary source. Solvent lost

shall not include solvent that is recycled or disposed of properly. Any

person claiming exemption pursuant to this section shall maintain adequate

monthly records to substantiate their exempt status.

6.10 Brazing, soldering, or welding equipment.

6.11 Equipment used exclusively to compress or hold dry natural gas. Any internal

combustion engine or other emissions unit associated with the operation that would

otherwise require a written permit is not exempt.

6.12 Fugitive emissions sources such as valves and flanges associated with an emissions

unit that is exempt from a written permit.

6.13 Unvented (except for emergency pressure relief valves) pressure vessels

associated with an emissions unit that is exempt from a written permit.

6.14 Fugitive emissions sources and pressure vessels that are associated with an

emissions unit for which a written permit is required shall be included as part of

such emissions unit. A separate permit for the fugitive source or pressure vessel is

not required.

6.15 Pits and ponds as defined in Rule 1020 (Definitions).

6.16 Portable Emissions Units: a portable emissions unit for which a written permit is

otherwise required, shall be exempt from the permitting requirements provided that

all of the following conditions are met:

6.16.1 The emissions unit has a valid registration obtained in accordance with the

provisions of Rule 2280 (Portable Equipment Registration), the Statewide

Portable Equipment Registration Program (California Code of Regulation

Title 13, Article 5, Sections 2450-2465), or other equipment registration

program approved by the APCO; and
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6.16.2 The portable emissions unit is not subject to the District's Title V permitting

requirements (Rule 2520).

6.17 Roadmix manufacturing and application operations

6.17.1 Roadmix manufacturing operations, provided that

6.17.1.1 The roadmix is used exclusively on properties owned or

operated by the company which operates the roadmix

manufacturing operation and generated the roadmix feedstock,

excluding aggregates, and

6.17.1.2 The roadmix feedstock does not contain refined hydrocarbons.

6.17.1.3 Notwithstanding the provisions of Section 6.17.1.1, an exempt

roadmix manufacturing operator may donate roadmix material to

non-profit organizations.

6.17.2 Roadmix application operations.

6.18 Laboratory testing equipment and quality control testing equipment used exclusively

for chemical and physical analysis, provided

6.18.1 Emissions from such equipment do not exceed 2.0 pounds per day or 75

pounds per year, and

6.18.2 The equipment is not a HAP source.

6.19 Low Emitting Units, except those which belong to a source category listed in

Sections 6.1 through 6.18, shall not require an Authority to Construct or Permit to

Operate. 

6.19.1 Low Emitting Units, which belong to a source category listed in Sections

6.1 through 6.18, shall require an Authority to Construct or Permit to

Operate unless they are specifically exempted in the applicable source

category section.

6.19.2 Notwithstanding Sections 6.19 and 6.19.1, Low Emitting Units, with

uncontrolled HAP emissions that may cause a significant health risk to the

public, shall require an Authority to Construct or Permit to Operate.

7.0 District Exempt Activities

No Authority to Construct or Permit to Operate shall be required for the following

activities:
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7.1 Routine replacement of a whole or partial emissions unit where the replacement

part is the same as the original emissions unit in all respects except for the serial

number and the action does not create a reconstructed Stationary Source.

7.2 The venting of California Public Utility Commission quality natural gas from

pipelines and compressors for the sole purpose of pipeline and compressor repair

and or maintenance, providing that such emissions consist solely of residual natural

gas that is vented after the equipment is isolated or shut down and that the residual

amounts have been reduced as much as practical prior to venting.

7.3 Repairs or maintenance not involving structural changes to any emissions unit for

which a permit has been granted (Health and Safety Code, Section 42310(f)).

7.4 The detonation of explosives for research and development activity, provided the

quantity of explosives detonated does not exceed 100 pounds per day and 1,000

pounds per year at a single stationary source.

7.5 Pilot tests for soil remediation projects, provided that all of the following

conditions are met.

7.5.1 The sole purpose of the pilot test is to determine the VOC concentration in

the soil in order to design or size the appropriate control equipment for the

soil remediation project;

7.5.2 The pilot test will not last more than five days; and

7.5.3 The effluent gas stream from the pilot test is controlled by either carbon

canisters, a thermal or catalytic incinerator, or an IC engine.

8.0 Administrative Requirements

Recordkeeping shall be required to verify or maintain any exemption for which the

exemption is based on a throughput or emissions limitation. Such records shall be retained

for at least two years and provided to the APCO upon request.

9.0 Compliance Schedule

The owner or operator of an emissions unit that was exempt from written permits at the

time of installation, which becomes subject to the provisions of Rule 2010 (Permits

Required), through loss of exemption, shall submit an application for a Permit to Operate

within six months from the date of adoption of this rule and shall not be subject to Rule

2201 (New and Modified Stationary Source Review Rule), until such time that the

emissions unit is modified.
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Heat Exchanger

Oil

and Water

Steam

To

Sales

Oil and

 Water

Oil

Depurator

Depurator

To Steam

Generation

Equipment

Valve

Reject Oil

and Water

Water

Water

& Hydrocarbons

Water Water

Noncondensible

Gas to

Incinerator

or Vent

To

Injection

Well

Water

Source

Oil

Well

Spent Regeneration Brine

Backwash

Drain

Tank

Settling

Tank

Shipping

Tank

Wash

Tank Desander

Gauge

Tank

Condensate

Tank

Schematic

Production Facilities

for Crude Oil

Water

Oil

Raw Water

Tank

Produced

Water Tank

Filtered

Water Tank Brine Tank

Softeners Filters

Soft Water

Tank

Waste Water

Tank

Figure1 Oil/water line
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