SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

July 23, 1998 XX-XX-08 464-1 

RULE 464 ORGANIC CHEMICAL MANUFACTURING OPERATIONS 

Adopted 7-23-98

(Amended XX-XX-08)

INDEX

100 GENERAL

101 PURPOSE 

102 APPLICABILITY 

103 SEVERABILITY 

110 EXEMPTION, STATIONARY SOURCE WITH ≤ 15 POUNDS/DAY UNCONTROLLED 

VOC EMISSIONS FROM ORGANIC CHEMICAL PLANTS 

111 EXEMPTION, VENT STREAM WITH ≤ 15 POUNDS/DAY UNCONTROLLED VOC 

EMISSIONS 

112 EXEMPTION, NON-PHARMACEUTICAL OR NON-COSMETIC SEPARATION 

OPERATION WITH ≤ 15 POUNDS/DAY UNCONTROLLED VOC EMISSIONS 

113 EXEMPTION, PROCESS TANK WITH ≤ 15 POUNDS/DAY UNCONTROLLED VOC 

EMISSIONS 

114 EXEMPTION, STATIONARY SOURCE WITH ≤ 15 POUNDS/DAY UNCONTROLLED 

VOC EMISSIONS FROM RESEARCH AND DEVELOPMENT OPERATIONS 

115 EXEMPTION, LABORATORY EQUIPMENT SOLVENT CLEANING 

116 EXEMPTION, SOLVENT CLEANING OF OPERATION REGULATED BY FOOD AND 

DRUG ADMINISTRATION WITH ≤ 15 POUNDS/DAY VOC EMISSIONS 

200 DEFINITIONS

201 AIR POLLUTION CONTROL DEVICE 

202 BATCH PROCESS 

203 CLEANUP MATERIAL 

204 CLOSED CONTAINER 

205 CONTAINER 

206 CONTINUOUS PROCESS 

207 COSMETICS MANUFACTURING PLANT 

208 EMISSION PROFILE 

209 EXEMPT COMPOUND 

210 INDIVIDUAL DRAIN SYSTEM 

211 LEAK 

212 MAINTENANCE WASTEWATER 

213 MAXIMUM UNCONTROLLED VOC EMISSIONS 

214 ORGANIC CHEMICAL MANUFACTURING PROCESS UNIT 

215 ORGANIC CHEMICAL PLANT 

216 PHARMACEUTICAL MANUFACTURING PLANT 

217 POINT OF DETERMINATION 

218 POTENTIAL TO EMIT 

219 PROCESS 

220 PROCESS CONDENSER 

221 PROCESS TANK 

222 PROCESS VENT 

223 PROCESS WASTEWATER 

224 PRODUCTION EQUIPMENT EXHAUST SYSTEM 

225 RECOVERY DEVICE 

226 RESEARCH AND DEVELOPMENT OPERATION 

227 STATIONARY SOURCE 

228 STORAGE TANK 

229 SURFACE IMPOUNDMENT 

230 VAPOR-TIGHT 

231 VOLATILE ORGANIC COMPOUND (VOC) 

232 WASTEWATER 
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464-2 July 23, 1998 XX-XX-08

233 WASTEWATER MANAGEMENT UNIT 

234 WATER SEAL 

300 STANDARDS

301 REACTORS, DISTILLATION COLUMNS, CRYSTALLIZERS, EVAPORATORS OR 

CENTRIFUGES 

302 SEPARATION OPERATIONS 

303 DRYERS OR PRODUCTION EQUIPMENT EXHAUST SYSTEMS 

304 PROCESS TANKS 

305 WASTEWATER 

306 LIQUID TRANSFER 

307 STORAGE TANKS 

308 CLEANUP AND STORAGE REQUIREMENTS 

400 ADMINISTRATIVE REQUIREMENTS

401 EFFECTIVE DATES

4021 PETITION FOR EXEMPTION 

4032 AUTHORITY TO CONSTRUCT APPLICATION 

4043 OPERATION AND MAINTENANCE PLAN 

4054 PROCEDURE FOR PROCESSING AN OPERATION AND MAINTENANCE PLAN 

4065 WASTEWATER REPORT 

4076 CALCULATION FOR VOC COMPOSITE PARTIAL VAPOR PRESSURE 

4087 DETERMINATION OF MAXIMUM UNCONTROLLED VOC MASS EMISSION RATE 

4098 DETERMINATION OF VOC MASS EMISSION RATE USING ENGINEERING 

ASSESSMENT 

41009 DETERMINATION OF VOC MASS EMISSION RATE USING EMISSION TESTING 

4110 CALCULATION FOR VOC MASS EMISSION RATE, CONTROL EFFICIENCY, AND 

SYSTEM EFFICIENCY 

4121 PROCEDURES FOR DEMONSTRATING COMPLIANCE 

4132 VIOLATIONS 

500 MONITORING AND RECORDS 

501 RECORDKEEPING 

502 TEST METHODS 
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July 23, 1998 XX-XX-08 464-3 

100 GENERAL

101 PURPOSE: To limit emissions of volatile organic compounds (VOC) from organic 

chemical plants. 

102 APPLICABILITY: The provisions of this rule shall apply to: 

102.1 Equipment located in organic chemical plants which emit VOC, including, but not 

limited to reactors, distillation columns, crystallizers, evaporators, process tanks, 

wastewater tanks, centrifuges, filters, separators and air dryers. 

102.2 The transfer and storage of VOC at organic chemical plants. 

103 SEVERABILITY: If any section, subsection, sentence, clause, phrase, or portion of this 

rule is, for any reason, held invalid, unconstitutional, or unenforceable by any court of 

competent jurisdiction, such portion shall be deemed as a separate, distinct, and 

independent provision, and such holding shall not affect the validity of the remaining 

portions thereof. 

110 EXEMPTION, STATIONARY SOURCE WITH ≤ 15 POUNDS/DAY UNCONTROLLED 

VOC EMISSIONS FROM ORGANIC CHEMICAL PLANTS: The provisions of this rule 

shall not apply to organic chemical plants which, cumulatively at a stationary source, emit 

15 pounds per day or less of maximum uncontrolled VOC emissions, as defined in 

Section 213, from organic chemical plants, provided the petition requirements in Section 

4021 and the reporting and recordkeeping requirements in Sections 501.4 and 501.10 are 

satisfied. For purposes of this exemption, all process emissions, including those from 

equipment cleanup, shall be summed to determine maximum emission rate. 

111 EXEMPTION, VENT STREAM WITH ≤ 15 POUNDS/DAY UNCONTROLLED VOC 

EMISSIONS: Any reactor, distillation column, evaporator, crystallizer or centrifuge with a 

total maximum uncontrolled VOC emissions, as defined in Section 213, of 15 pounds per 

day or less is exempt from Section 301, provided the petition requirements in Section 

4021 and the reporting and recordkeeping requirements in Sections 501.5 and 501.10 are 

satisfied. 

112 EXEMPTION, NON-PHARMACEUTICAL OR NON-COSMETIC SEPARATION 

OPERATION WITH ≤ 15 POUNDS/DAY UNCONTROLLED VOC EMISSIONS: Any 

separation device at any organic chemical plant, except pharmaceutical manufacturing 

plant or cosmetic manufacturing plant, with a total maximum uncontrolled VOC emissions, 

as defined in Section 213, of 15 pounds per day or less is exempt from Section 302.2, 

provided the petition requirements in Section 4021 and the reporting and recordkeeping 

requirements in Sections 501.5 and 501.10 are satisfied. 

113 EXEMPTION, PROCESS TANK WITH ≤ 15 POUNDS/DAY UNCONTROLLED VOC 

EMISSIONS: Any process tank with a total maximum uncontrolled VOC emissions, as 

defined in Section 213, of 15 pounds per day or less is exempt from Section 304.2, 

provided the petition requirements in Section 4021 and the reporting and recordkeeping 

requirements in Sections 501.5 and 501.10 are satisfied. 

114 EXEMPTION, STATIONARY SOURCE WITH ≤ 15 POUNDS/DAY UNCONTROLLED 

VOC EMISSIONS FROM RESEARCH AND DEVELOPMENT OPERATIONS: Except for 

the recordkeeping requirement under Sections 501.6 and 501.10 , the provisions of this 

rule shall not apply to bench scale laboratory and pilot plant operations which, 

cumulatively at a stationary source, emit, at design production rating, 15 pounds per day 

or less of maximum uncontrolled VOC emissions, as defined in Section 213, and whose 

primary purpose is to conduct research and development into new processes and 

products. Bench scale research and development operations which, cumulatively at a 

stationary source, emit greater than 15 pounds per day of maximum uncontrolled VOC 

emissions shall comply with the provisions of this rule. 
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464-4 July 23, 1998 XX-XX-08

115 EXEMPTION, LABORATORY EQUIPMENT SOLVENT CLEANING: The provisions of 

Section 308.4 and 308.5 shall not apply to solvent cleaning of bench scale laboratory 

equipment used exclusively for chemical or physical analyses. 

116 EXEMPTION, SOLVENT CLEANING OF OPERATION REGULATED BY FOOD AND 

DRUG ADMINISTRATION WITH ≤ 15 POUNDS/DAY OF UNCONTROLLED VOC 

EMISSIONS: Except for the record keeping requirements in Sections 501.7 and 501.10, 

the provision of Section 308.3 shall not apply to solvent cleaning of operations, subject to 

Food and Drug Administration (FDA) regulation, 21 CFR Parts 210 and 211, which, 

cumulatively at a stationary source, emit 15 pounds per day or less of maximum 

uncontrolled VOC emissions, provided the source provides documentation to the Air 

Pollution Control Officer that demonstrate that the solvent used is required by FDA for the 

cleanliness requirement of 21 CFR Parts 210 and 211 and that there is no available 

compliant solvent that meets FDA requirements. 

200 DEFINITIONS

201 AIR POLLUTION CONTROL DEVICE: Equipment installed on a process vent, storage 

tank, production equipment exhaust systems, or combination thereof which reduces the 

mass of VOC emitted to the atmosphere. Examples include incinerators, carbon 

adsorption units, condensers, and gas absorbers. Process condensers are not 

considered air pollution control devices. 

202 BATCH PROCESS: Batch process is any noncontinuous operation in which a discrete 

quantity or batch of feed is charged into a unit operation and processed at one time. 

Batch process includes noncontinuous operations in which the equipment is fed 

intermittently or discontinuously. Addition of raw material and withdrawal of product do 

not occur simultaneously in a batch process. After each batch operation, the equipment is 

generally emptied before a fresh batch is started. 

203 CLEANUP MATERIAL: A material (e.g., solvents) that contains VOC as defined in 

Section 231 used to clean parts and equipment used in organic chemicals and 

pharmaceuticals manufacturing operations. 

204 CLOSED CONTAINER: A container which has a cover where the cover meets with the 

main body of the container without any visible gaps between the cover and the main body 

of the container. 

205 CONTAINER: As used in the wastewater provisions, container means any portable waste 

management unit that has a capacity greater than or equal to 0.1 m3

 in which a material is 

stored, transported, treated, or otherwise handled. A container includes but is not limited 

to drums, barrels, tank trucks, barges, dumpsters, tank cars, dump trucks, and ships. 

206 CONTINUOUS PROCESS: Continuous process is characterized by steady-state 

conditions in which reactants are added and products are removed simultaneously. 

207 COSMETICS MANUFACTURING PLANT: Any plant producing or blending chemicals 

for use in cosmetic products and/or manufacturing cosmetic products by chemical 

processes. 

208 EMISSION PROFILE: An emission profile, developed for a vent or a control device, is 

the VOC emission rates (in lb/hr) versus time in a period of time that is sufficient to 

include all emission episodes during a production run. It shall be based on either process 

knowledge, engineering analyses, or test data collected. 

209 EXEMPT COMPOUND: For the purposes of this rule, “exempt compound” has the same 

meaning as in Rule 101-GENERAL PROVISIONS AND DEFINITIONS. 
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July 23, 1998 XX-XX-08 464-5 

210 INDIVIDUAL DRAIN SYSTEM: A stationary system used to convey wastewater to a 

waste management unit. The system includes hard piping, all process drains and junction 

boxes, manholes, sumps, and lift stations, conveying wastewater. A segregated storm 

water sewer system, which is a drain and collection system designed and operated for the 

sole purpose of collecting rainfall-runoff at a facility, and which is segregated from all other 

individual drain systems, is excluded from this definition. 

211 LEAK: A leak is: 

211.1 The dripping of liquid containing VOC in excess of three drops per minute; or 

211.2 A reading as methane on a portable hydrocarbon detection instrument of 500 part 

per million pursuant to Sections 305.5 and 305.6 as applicable or greater above 

background when measured within one centimeter of the source; or 

211.3 The appearance of a visible mist. 

212 MAINTENANCE WASTEWATER: Wastewater generated by the draining of process fluid 

from components in the chemical manufacturing process unit into an individual drain 

system prior to or during maintenance activities. Maintenance wastewater can be 

generated during planned and unplanned shutdowns and during periods not associated 

with a shutdown. Examples of activities that can generate maintenance wastewater 

include descaling of heat exchanger tubing bundles, cleaning of distillation column traps, 

draining of low legs and high point bleeds, draining of pumps into an individual drain 

system, and draining of portions of the chemical manufacturing process unit for repair. 

213 MAXIMUM UNCONTROLLED VOC EMISSIONS: The maximum quantity of VOC 

emissions, based on maximum physical and operational design capacity including 

limitations contained on a Permit to Operate issued pursuant to Rule 201-GENERAL 

PERMIT REQUIREMENTS, which has exited the last recovery device, such as a process 

condenser, but which has not yet been introduced into an air pollution control device to 

reduce the mass of VOC in the stream. 

214 ORGANIC CHEMICAL MANUFACTURING PROCESS UNIT: Equipment, such as 

reactors, product separators, recovery devices, distillation units, receivers, and feed, 

intermediate and product storage vessels, that are assembled and connected by pipes or 

ducts to process raw materials and to manufacture an intended organic chemical product. 

An organic chemical manufacturing process unit includes pumps, compressors, agitators, 

pressure relief devices, sampling connection systems, open-ended valves or lines, valves, 

connectors, instrumentation systems, and control devices or systems. 

215 ORGANIC CHEMICAL PLANT: Any facility or operation that is engaged in producing 

organic chemicals and/or manufacturing products by chemical processes using organic 

chemicals and that has 28 as the first two digits in their Standard Industrial Classification 

Code as determined from the Standard Industrial Classification Manual, 1987 Edition, 

published by the Office of Management and Budget. Organic chemical plants may 

include, but are not limited to the manufacture of: industrial organic chemicals; plastic and 

synthetic resins, synthetic rubber, synthetic and other man made fibers; drugs; soap, 

detergents and cleaning preparations, perfumes, cosmetics and other toilet preparations; 

paints, varnishes, lacquers, enamels and allied products; agricultural chemicals; safflower 

and sunflower oil extracts; re-refining. 

216 PHARMACEUTICAL MANUFACTURING PLANT: Any plant producing or blending 

chemicals for use in pharmaceutical products and/or manufacturing pharmaceutical 

products by chemical processes. 

217 POINT OF DETERMINATION: Used in determining the initial point of evaluation for 

wastewater stream, point of determination is the location where the wastewater exits the 

process or processes, often the last recovery device. The point of determination for 

wastewater from research and development operations shall be the waste management 

unit. 
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464-6 July 23, 1998 XX-XX-08

218 POTENTIAL TO EMIT: The maximum physical and operational design capacity to emit a 

pollutant during each calendar year. Limitations on the physical or operational design 

capacity, including emissions control devices and limitations on hours of operation, may 

be considered only if such limitations are federally enforceable. 

219 PROCESS: A process is a logical grouping of processing equipment which collectively 

functions to produce a product or isolated intermediate. A process may consist of one or 

more unit operations. A process includes all or a combination of reaction, recovery, 

separation, purification, or other activity, operation, manufacture, or treatment which are 

used to produce a product or isolated intermediate. The physical boundaries of a process 

are flexible, providing a process ends with a product or isolated intermediate, or with 

cessation of on-site processing. A nondedicated solvent recovery or nondedicated 

formulation operation which serves more than one process to recover or formulate 

numerous materials and/or products is considered as a single process. 

220 PROCESS CONDENSER: A condenser whose primary purpose is to recover material as 

an integral part of a unit operation. To be considered as an integral part of a unit 

operation, that recovered material must be used in a subsequent operation at the 

stationary source or is a primary product of the operation. The condenser must support a 

vapor-to-liquid phase change for periods of source equipment operation that are above 

the boiling or bubble point of substance(s). Examples of process condensers include 

distillation condensers, reflux condensers, process condensers in line prior to the vacuum 

source, and process condensers used in stripping or flashing operations. 

221 PROCESS TANK: A process tank is a tank, located within the bounds of a process, 

which is used for mixing, separating, blending, heating, treating and/or collecting material 

discharged from a feedstock storage tank or unit operation within the process, and which 

transfers this material to another unit operation within the process or a product storage 

tank. A separating tank is a process tank if it is covered having no exposed liquid surface, 

otherwise, it is a separation operation subject to Section 302. Examples of process tanks, 

include surge control vessels, bottoms receivers, enclosed oil and water separators, or 

enclosed gravity separators. 

222 PROCESS VENT: A vent from a unit operation through which has VOC-containing gas 

stream, or has the potential to be released into the atmosphere. Examples of process 

vents include, but are not limited to, vents on bottom receivers, surge control vessels, 

reactors, filters, centrifuges, wastewater tanks, process tanks and condensers used for 

product recovery. 

223 PROCESS WASTEWATER: Wastewater which, during manufacturing or processing, 

comes into direct contact with or results from the production or use of any raw material, 

intermediate product, finished product, by-product, or waste product. Examples are 

product tank drawdown or feed tank drawdown; water formed during a chemical reaction 

or used as a reactant; water used to wash impurities from organic products or reactants; 

water used to cool or quench organic vapor streams through direct contact; and 

condensed steam from jet ejector systems pulling vacuum on vessels containing organics. 

224 PRODUCTION EQUIPMENT EXHAUST SYSTEM: An arrangement of hood, ductwork 

and/or stack which collects one or more process vents and discharges into the 

atmosphere. For the purposes of Section 303, the emission is the total amount of VOC 

collected and released to the atmosphere. 

225 RECOVERY DEVICE: Recovery device means an individual unit of equipment capable 

of and used for the purpose of recovering chemicals for use, reuse, or sale. Recovery 

devices include, but are not limited to, absorbers, carbon adsorbers, and condensers. 

226 RESEARCH AND DEVELOPMENT OPERATION: An operation whose primary purpose 

is for research and development of new processes and products, that is conducted under 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

July 23, 1998 XX-XX-08 464-7 

the close supervision of technically trained personnel, and that is not involved in the 

manufacture of final or intermediate products for commercial purposes. 

227 STATIONARY SOURCE: Any building, structure, facility, or emissions unit which emits or 

may emit any regulated air pollutant. 

227.1 Building, structure, facility, or emissions unit includes all pollutant emitting 

activities which: 

a. Belong to the same industrial grouping, and 

b. Are located on one property or on two or more contiguous properties, and 

c. Are under the same or common ownership, operation, or control or which 

are owned or operated by entities which are under common control. 

227.2 Pollutant emitting activities shall be considered as part of the same industrial 

grouping if: 

a. They belong to the same two-digit standard industrial classification code, 

or 

b. They are part of a common production process (Common production 

process includes industrial processes, manufacturing processes and any 

connected processes involving a common material). 

227.3 The emissions from loading and unloading of cargo carriers at the stationary 

source shall be considered emissions from the stationary source. 

228 STORAGE TANK: A tank or other vessel that is used to store organic liquids that contain 

one or more VOC. The following are not considered storage tanks for the purposes of this 

rule: 

228.1 Vessels that are: 

a. Attached to motor vehicles such as trucks, railcars, barges, or ships, and 

b. Used for transporting raw materials and products in and out of the plant; 

228.2 Pressure vessels designed to operate in excess of 204.9 kilopascals and have no 

leak; and 

228.3 Process tanks. 

229 SURFACE IMPOUNDMENT: A waste management unit which is a natural topographic 

depression, manmade excavation, or diked area formed primarily of earthen materials 

(although it may be lined with manmade materials), which is designed to hold an 

accumulation of liquid wastes or water containing free liquids. A surface impoundment is 

used for the purpose of treating, storing, or disposing of wastewater or residuals, and 

does not include injection wells. Examples of surface impoundments are equalization, 

settling, and aeration pits, ponds, and lagoons. 

230 VAPOR-TIGHT: The concentration of volatile organic compound (VOC), measured one 

centimeter from the source pursuant to Section 502.5, shall not exceed 500 parts per 

million (expressed as methane) above background. 

231 VOLATILE ORGANIC COMPOUND (VOC): For the purposes of this rule, “volatile 

organic compound” has the same meaning as in Rule 101-GENERAL PROVISIONS AND 

DEFINITIONS. 

232 WASTEWATER: Wastewater is VOC-containing water, raw material, intermediate, 

product, by-product, co-product, or waste material that is discarded from an organic 

chemical manufacturing process unit and either: 
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464-8 July 23, 1998 XX-XX-08

232.1 Contains a total VOC concentration of at least 5 parts per million by weight and 

has a flow rate of 0.02 liter per minute or greater; or 

232.2 Contains a total VOC concentration of at least 10,000 parts per million by weight 

at any flow rate. 

Wastewater includes process wastewater and maintenance wastewater. For the purposes 

of this rule, noncontact cooling water is not considered a wastewater. 

233 WASTE MANAGEMENT UNIT: A piece of equipment, structure, or transport mechanism 

used in handling, storage, treatment, or disposal of waste. Examples of a waste 

management unit include a tank, surface impoundment, container, oil-water separator, 

individual drain system, steam stripping unit, thin-film evaporation unit, waste incinerator, 

and landfill. 

234 WATER SEAL: A seal pot, p-leg trap, or other type of trap filled with water that has a 

design capability to create a water barrier between the sewer and the atmosphere. 

300 STANDARDS

301 REACTORS, DISTILLATION COLUMNS, CRYSTALLIZERS, EVAPORATORS OR 

CENTRIFUGES:

301.1 A person shall not use any reactor, distillation column, crystallizer, evaporator or 

enclosed centrifuge which emits more than 15 pounds per day of maximum 

uncontrolled VOC unless such emission is vented to a VOC capture and control 

system which has a combined system efficiency of at least 85 percent by weight, 

and a control efficiency of at least 90 percent by weight, and is permitted pursuant 

to Rule 201-GENERAL PERMIT REQUIREMENTS and determined by the 

appropriate methods in Section 4121. 

301.2 A VOC capture and control system controlling more than two process vent 

located at a non-pharmaceutical manufacturing plant or a non-cosmetic 

manufacturing plant may be used to meet the control requirement of this Section 

as long as: 

a. It has an overall combined system efficiency of at least 85 percent by 

weight, and an overall control efficiency of at least 90 percent by weight 

across its inlet and outlet as determined by the appropriate methods in 

Section 4121 and is permitted pursuant to Rule 201-GENERAL PERMIT 

REQUIREMENTS, or 

b. or unless the combined VOC emissions from all process vents is reduced 

to below 33 pounds per day, as determined by the appropriate methods 

in Section 4121 and is permitted pursuant to Rule 201-GENERAL 

PERMIT REQUIREMENTS. 

302 SEPARATION OPERATIONS:

302.1 AT PHARMACEUTICAL AND COSMETIC MANUFACTURING PLANTS: A 

person shall not use any centrifuge, rotary vacuum filter, or other device at a 

pharmaceutical manufacturing plant or cosmetic manufacturing plant which has 

an exposed liquid surface where the liquid contains VOC having a VOC 

composite partial vapor pressure, as determined pursuant to Section 4076, of 26 

mm Hg (0.5 psi) or more at 20 oC (68 oF), unless it incorporates a hood or 

enclosure with a delivery system or ductwork to collect VOC emissions, 

exhausting to a carbon adsorber, or equivalent control method approved by the 

Air Pollution Control Officer and the EPA.
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July 23, 1998 XX-XX-08 464-9 

302.2 AT OTHER ORGANIC CHEMICAL PLANTS: A person shall not use any 

centrifuge, rotary vacuum filter, or other device at other organic chemical plant 

which has an exposed liquid surface where the liquid contains VOC having a 

VOC composite partial vapor pressure, as determined pursuant to Section 4076, 

of 26 mm Hg (0.5 psi) or more at 20 oC (68 oF), and which emits more than 15 

pounds per day of maximum uncontrolled VOC, unless such emission is vented 

to a VOC capture and control system which has a combined system efficiency of 

at least 85 percent by weight, and a control efficiency of at least 90 percent by 

weight, as determined by the appropriate method in Section 4121 and is 

permitted pursuant to Rule 201-GENERAL PERMIT REQUIREMENTS. 

303 DRYERS OR PRODUCTION EQUIPMENT EXHAUST SYSTEMS:

303.1 A person shall not use any dryer or other production equipment exhaust system 

which emits 330 pounds per day or more of maximum uncontrolled VOC unless 

such emission is vented to a VOC capture and control system which has a 

combined system efficiency of at least 85 percent by weight, and a control 

efficiency of at least 90 percent by weight, as determined by the appropriate 

methods in Section 4121 and is permitted pursuant to Rule 201-GENERAL 

PERMIT REQUIREMENTS. 

303.2 A person shall not use any dryer or production equipment exhaust system which 

emits less than 330 pounds on any day of maximum uncontrolled VOC unless 

such emissions is reduced to less than 33 pounds per day. 

304 PROCESS TANKS:

304.1 A person shall not use any process tank containing material with a VOC 

composite partial vapor pressure, as determined pursuant to Section 4076, of 

greater than 26 mm Hg at 20 oC (0.5 psi at 68 oF), unless it is a closed container 

as defined in Section 204, which is kept tightly covered at all times except when 

accessing the container. 

304.2 A person shall not use any process tank which contains material with a VOC 

composite partial vapor pressure, as determined pursuant to Section 4076, of 

greater than 26 mm Hg at 20 oC (0.5 psi at 68 oF), and which emits more than 15 

pounds per day of maximum uncontrolled VOC, unless such emission is vented 

to a VOC capture and control system which has a combined system efficiency of 

at least 85 percent by weight, and a control efficiency of at least 90 percent by 

weight, as determined by the appropriate methods in Section 4121 and is 

permitted pursuant to Rule 201-GENERAL PERMIT REQUIREMENTS. 

305 WASTEWATER: A person shall not use any equipment, such as wastewater tank, 

container, surface impoundment, individual drain system, and oil-water separator, that 

receives, manages, or treats wastewater at the point of determination, as defined in 

Section 217, with a VOC concentration of 500 parts per million by weight or higher and a 

flow rate of greater than or equal to one liter per minute, or with a VOC concentration of 

10,000 part per million per weight or higher at any flow rate, unless the equipment meets 

the applicable equipment standard listed below: 

305.1 A person shall install a fixed roof on any wastewater tank that is not used for 

wastewater mixing, heating, or treating with an exothermic reaction. 

305.2 A person shall install one of the following controls on any wastewater tank that is 

used for wastewater mixing, heating, or treating with an exothermic reaction: 

a. A fixed roof and closed-vent system that routes VOC to a control device 

with a control efficiency of at least 90 percent by weight, as determined 

by the appropriate methods in Sections 4121 and is permitted pursuant to 

Rule 201-GENERAL PERMIT REQUIREMENTS; 

b. External floating roof or fixed roof with internal floating roof in compliance 

with standards described in 40 CFR 63.119(b), (c), (d), and 63.120 

305.3 A person shall install a cover and submerged fill pipe on any container with a 

capacity greater than or equal to 112 gallons. 
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464-10 July 23, 1998 XX-XX-08

305.4 A person shall install a cover and closed-vent system that routes VOC to a control 

device with a control efficiency of at least 90 percent by weight, as determined by 

the appropriate methods in Section 4121 and is permitted pursuant to Rule 201-

GENERAL PERMIT REQUIREMENTS, on any surface impoundment. 

305.5 A person shall install a cover and closed-vent system that routes VOC to a control 

device with a control efficiency of at least 90 percent by weight, as determined by 

the appropriate methods in Section 4121 and is permitted pursuant to Rule 201-

GENERAL PERMIT REQUIREMENTS, or a solid, vapor-tight, as defined in 

Section 230, full contact fixed cover which totally encloses the liquid contents on 

any individual drain system. The cover openings shall be closed and sealed, 

except when the opening is being used for inspection, maintenance, or 

wastewater sampling. The concentration of VOC shall be measured using Section 

502.5 at one centimeter from the fixed cover by the effective date in Section 401.3 

and semiannually thereafter to ensure that there are no emission leaks greater 

than 500 parts per million (expressed as methane). Any emission leak greater 

than 500 parts per million must be reported to the Air Pollution Control Officer as 

soon as reasonably possible, but not later than one hour after its detection. If the 

Air Pollution Control Officer can not be contacted, the report shall be made at the 

commencement of the next regular working day. The leak shall be repaired within 

15 calendar days. 

305.6 A person shall install one of the following controls on any oil-water separator: 

a. Fixed roof and closed-vent system that routes VOC to a control device 

with a control efficiency of at least 90 percent by weight, as determined 

by the appropriate methods in Section 4121 and is permitted pursuant to 

Rule 201- GENERAL PERMIT REQUIREMENTS. 

b. External floating roof or fixed roof with internal floating roof in compliance 

with standards described in 40 CFR 63.119(b), (c), (d), and 63.120. 

c. A solid, vapor-tight, as defined in Section 230, full contact fixed cover 

which totally encloses the liquid contents, with all the cover openings 

closed and sealed, except when the opening is being used for inspection, 

maintenance, or wastewater sampling. The concentration of VOC shall 

be measured using Section 502.5 at one centimeter from the fixed cover 

by the effective date in Section 401.3 and semiannually thereafter to 

ensure that there are no emission leaks greater than 500 parts per million 

(expressed as methane). Any emission leak greater than 500 parts per 

million must be reported to the Air Pollution Control Officer as soon as 

reasonably possible, but not later than one hour after its detection. If the 

Air Pollution Control Officer can not be contacted, the report shall be 

made at the commencement of the next regular working day. The 

emission leak shall be repaired within 15 calendar days. 

d. A solid, sealed, gasketed, fixed cover which totally encloses the liquid 

contents, with all the cover openings closed and sealed, except when the 

opening is being used for inspection, maintenance, or wastewater 

sampling. The cover may include a pressure/vacuum valve. The 

concentration of VOC shall be measured using Section 502.5 at one 

centimeter from the roof seals, fixed cover, access doors, 

pressure/vacuum valve, and other openings shall not exceed 500 parts 

per million (expressed as methane) above background. Roof seals, fixed 

cover, access doors, and other openings shall be inspected by the 

effective date in Section 401.3 and semiannually thereafter to ensure that 

there are no emission leaks greater than 500 parts per million. Any 

emission leak greater than 500 parts per million must be reported to the 

Air Pollution Control Officer as soon as reasonably possible, but not later 

than one hour after its detection. If the Air Pollution Control Officer can 

not be contacted, the report shall be made at the commencement of the 

next regular working day. The leak shall be repaired within 15 calendar 

days. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

July 23, 1998 XX-XX-08 464-11 

305.7 A person complying with the notification requirements in Section 305.5 or 

Sections 305.6(c) and (d) shall be exempt from the provisions of Rule 602, 

BREAKDOWN CONDITIONS: EMERGENCY VARIANCE. 

305.8 One or more safety devices which vent directly to the atmosphere may be used 

on the wastewater tank, cover, closed-vent system, or control device provided 

each safety device meets all of the following conditions: 

a. The safety device is not used for planned or routine venting of organic 

vapors from the tank or the closed-vent system connected to a control 

device; and 

b. The safety device remains in a closed, sealed position at all times except 

when an unplanned event requires that the device open for the purpose 

of preventing physical damage or permanent deformation of the tank, 

cover, closed-vent system, or control device in accordance with good 

engineering and safety practices for handling flammable, combustible, 

explosive, or other hazardous materials. An example of an unplanned 

event is a sudden power outage. 

306 LIQUID TRANSFER: A person shall not transfer material with a VOC composite partial 

vapor pressure, determined pursuant to Section 4076, of greater than 26 mm Hg at 20 o

C 

(0.5 psi at 68 oF) into any tank truck, trailer, railroad tank car, or storage tank of 2000 

gallons capacity or greater, unless VOC emissions during transfer are controlled with one 

of the following control system: 

306.1 A vapor balance system with all the following components: 

a. A permanent submerged fill pipe which discharges at not more than six 

inches from the bottom of the tank; and, 

b. A submerged fill pipe which discharges at not more than six inches from 

the bottom of the tanker truck or railcar, and 

c. A vapor return line which transfers at least 90 percent by weight of 

displaced VOC vapor from the stationary storage tank being filled back to 

the mobile or stationary supply tank; and, 

d. A pressure-vacuum relief valve with relief settings of not less than ±0.03 

psig. 

306.2 A VOC capture and control system which has a combined system efficiency of at 

least 85 percent by weight, and a control efficiency of at least 90 percent by 

weight, and is permitted pursuant to Rule 201-GENERAL PERMIT 

REQUIREMENTS and determined by the appropriate methods in Section 4110. 

306.3 An internal or external floating roof which complies with the procedures described 

in 40 CFR 63.119(b), (c), (d), and 63.120. 

307 STORAGE TANKS:

307.1 A person shall install pressure/vacuum valve with a minimum pressure setting of 

0.03 psi and a minimum vacuum setting of 0.03 psi, or equivalent control method 

permitted pursuant to Rule 201 - GENERAL PERMIT REQUIREMENTS, on all 

vents of any storage tank, greater than 55 gallons and less than or equal to 

40,000 gallons, that stores material with a VOC composite partial vapor pressure, 

as determined pursuant to Section 4076, of greater than 78 mm Hg at 20 o

C (1.5 

psi at 68 oF). Storage tanks with capacity greater than 40,000 gallons are subject 

to Rule 446-STORAGE OF PETROLEUM PRODUCTS. 

307.2 A storage tank with a capacity of 55 gallons or less that stores material with a 

VOC composite partial vapor pressure of greater than 78 mm Hg at 20 o

C (1.5 psi 

at 68 o

F) shall be a closed container which is kept tightly covered at all times 

except when accessing the container. 

308 CLEANUP AND STORAGE REQUIREMENTS: A person using cleanup material shall 

conform to all the following requirements: 

308.1 A person shall use closed containers for the storage of disposal of cloth, paper, or 

sponges used for solvent cleanup; and 

308.2 A person shall store fresh or spent cleanup materials in closed containers; and 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

464-12 July 23, 1998 XX-XX-08

308.3 A person shall not use a cleanup material to perform in-line solvent cleaning of 

process units and pipings unless: 

a. The emissions are vented to a VOC capture and control system which 

has a combined system efficiency of at least 85 percent by weight, and a 

control efficiency of at least 90 percent by weight, or 

b. The solvent complies with a VOC content limit of 200 grams per liter and 

a vapor pressure limit of less than 45 mmHg at 68 o

F. 

308.4 Prior to (one year after date of adoption), Eexcept for laboratory equipment 

cleaning exempt pursuant to Section 115, a person shall not use a solvent to 

perform maintenance solvent cleaning including but not limited to mechanical 

parts and work areas unless the solvent complies with a VOC content limit of 50 

grams per liter (0.42 pounds per gallon).

308.5 Effective (one year after date of adoption), except for laboratory equipment 

cleaning exempt pursuant to Section 115, a person shall not use a solvent to 

perform maintenance solvent cleaning including but not limited to mechanical 

parts and work areas unless the solvent complies with a VOC content limit of 25 

grams per liter (0.21 pounds per gallon).

400 ADMINISTRATIVE REQUIREMENTS

401 EFFECTIVE DATES: 

401.1 BY JANUARY 1, 1999:

a. A person seeking an exemption for a process vent shall submit a petition 

for exemption pursuant to Section 402.

b. A person shall submit an Authority to Construct application, pursuant to 

Section 403. 

c. A person shall submit an Operation and Maintenance Plan, pursuant to 

Section 404.

d. A person shall submit wastewater report pursuant to Section 406.

401.2 BY JULY 1, 1999: The owner or operator of any organic chemical plant subject to 

this rule shall comply with Sections 301, 302, 303, 304, 306, 307, and 501.

401.3 BY JANUARY 1, 2000: The owner or operator of any organic chemical plant 

subject to this rule shall comply with Sections 305 and 308.

4021 PETITION FOR EXEMPTION: A person seeking an exemption for an organic chemical 

plant or a process vent , which is exempt pursuant to Sections 110, 111, 112, 113, 114, or 

116 shall submit to the Air Pollution Control Officer a petition for exemption. Such petition 

shall include a process diagram, and maximum uncontrolled VOC mass emission rate 

determined pursuant to Section 4087 and all pertinent information to support a basis for 

granting/denying petition. The Air Pollution Control Officer shall approve the petition 

unless it fails to demonstrate that the emission rate is below the cutoff level specified in 

Sections 110, 111, 112, 113, 114, or 116. The approved petition shall be effective until a 

modification, which results in an application for permit modification pursuant to Rule 201-

GENERAL PERMIT REQUIREMENTS, is made to the plant or process vent. A person 

shall comply with the following petition schedule: 

4021.1 EXISTING PLANT OR PROCESS VENT: The petition for exemption for an 

organic chemical plant or a process vent in existence prior to the adoption of this 

rule must be submitted by January 1, 1999. 

4021.2 NEW OR MODIFIED PLANT OR PROCESS VENT: The petition for exemption 

for a new or modified organic chemical plant or a process vent must be submitted 

30 calendar days before startup. 

4032 AUTHORITY TO CONSTRUCT APPLICATION: Any person installing a new or using an 

existing emission control equipment, as a means of complying with this rule, shall by 

January 1, 1999, submit an Authority to Construct application pursuant to Rule 201-

GENERAL PERMIT REQUIREMENTS to the Air Pollution Control Officer, unless the 

emission control equipment is currently under District permit and the use of the existing 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

July 23, 1998 XX-XX-08 464-13 

emission control equipment, without modification to the system, results in compliance with 

this rule. 

4043 OPERATION AND MAINTENANCE PLAN: Any person using an approved emission 

control device as a means of complying with this rule, shall submit, with the application for 

Authority to Construct, pursuant to Rule 201-GENERAL PERMIT REQUIREMENTS, an 

Operation and Maintenance Plan for the emission control device to the Air Pollution 

Control Officer for approval. Operation and Maintenance Plans for emission control 

devices installed prior to the adoption of this rule, if not previously submitted, must be 

submitted by January 1, 1999, and receive approval of the Air Pollution Control Officer. 

The plan shall specify key system operating parameters, such as temperatures, 

pressures, and/or flow rates, necessary to determine compliance with this rule and 

describe in detail procedures to maintain the approved emission control device and 

maintenance procedures that demonstrate continuous operation and compliance of the 

emissions control equipment during periods of emissions-producing operations. The plan 

shall also specify which records must be kept to document these operations and 

maintenance procedures. These records shall comply with the requirements of Sections 

501.1, 501.2 and 501.10. The plan shall be implemented upon approval by the Air 

Pollution Control Officer. 

4054 PROCEDURE FOR PROCESSING AN OPERATION AND MAINTENANCE PLAN:

4054.1 APPROVAL OF PLAN: The Air Pollution Control Officer shall determine whether 

the Operation and Maintenance Plan meets the requirements of Section 4043 not 

later than 30 days after receipt of the Plan, or within a longer period of time 

agreed upon by the parties. The Air Pollution Control Officer shall approve in 

writing an Operation and Maintenance Plan unless it fails to demonstrate 

continuous operations of the emissions control equipment during periods of 

emissions-producing operations, according to the standard set forth in this rule, 

and/or it fails to specify which daily records, in accordance with the requirements 

of Sections 501.1, 501.2 and 501.10, are to be kept to document the Operation 

and Maintenance procedures set forth in the Plan. 

4054.2 REVISION OF PLAN: If the Air Pollution Control Officer does not approve in 

writing an Operation and Maintenance Plan, the source shall receive written 

notice of the deficiency, and shall have an additional 30 days from the date of the 

notification of the deficiency to correct and resubmit the Operation and 

Maintenance Plan. The decision of the Air Pollution Control Officer regarding the 

resubmitted Operation and Maintenance Plan shall be final. Failure to correct the 

deficiency in an Operation and Maintenance Plan upon resubmittal shall 

constitute a violation of this rule that is subject to the penalties set forth in Health 

and Safety Code section 42400 et seq. 

4065 WASTEWATER REPORT: A person shall submit a wastewater report to the Air Pollution 

Control Officer by January 1, 1999, and annually thereafter by February 1st. The report 

shall identify and quantify each wastewater stream at the point of determination, as 

defined in Section 217, discharged from an organic chemical manufacturing process unit. 

 Information data and supporting test results, records or calculations on location, source of 

wastewater, VOC concentration as determined pursuant to Section 502.3 or using owner 

knowledge of the wastewater, and annual average flow rate shall be submitted for each 

wastewater stream. Examples of information that could constitute knowledge include 

material balances, records of chemical purchases, process stoichiometry, or previous test 

results provided the results are still representative of current operating practices at the 

process unit(s). One of the following methods shall be used to determine flow rate: 

4065.1 Use the maximum annual production capacity of the process unit, knowledge of 

the process, and mass balance information to estimate annual average 

wastewater flow rate. 

4065.2 Select the highest annual average flow rate of wastewater from historical records 

representing the most recent year of operation. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

464-14 July 23, 1998 XX-XX-08

4065.3 Measure the flow rate of the wastewater at the point of determination during 

conditions that are representative of average wastewater generation rates. 

Not withstanding the provisions of this section, the Air Pollution Control Officer may 

require testing pursuant to Section 502.3 to determine the VOC concentration. 

4076 CALCULATION FOR VOC COMPOSITE PARTIAL VAPOR PRESSURE: VOC 

composite partial vapor pressure is the sum of the partial vapor pressures of the 

compounds defined as VOCs, and shall be calculated by the following equation: 

( )( )

∑ ∑

∑

= =

=

+ +

= n

i

n

i i

i

e

e

w

w

n

i

i i i

c

MW

W

MW

W

MW

W

W VP MW

PP

1 1

1

Where: Ppc = VOC composite partial vapor pressure at 20o

C, in mm Hg. 

Wi

 = Weight of the "i"th VOC compound, in grams, as determined by 

ASTM E 260-916 (2006). 

Ww = Weight of water, in grams as determined by ASTM D 3792-8605. 

We = Weight of the “i”th exempt compound, in grams, as determined 

by ASTM E 260-916 (2006). 

Mwi = Molecular weight of the “i”th VOC compound, in grams per gmole, as given in chemical reference literature. 

Mww = Molecular weight of water, 18 grams per g-mole. 

Mwe = Molecular weight of the “i”th exempt compound, in grams per gmole, as given in chemical reference literature. 

Vpi = Vapor pressure of the “i”th VOC compound at 20o

C, in mm Hg, 

as determined by Section 502.4 of this rule. 

An alternate method for calculating the composite vapor pressure or determining the 

variables in the equation above may be allowed if approved in writing by the Air Pollution 

Control Officer and EPA. 

4087 DETERMINATION OF MAXIMUM UNCONTROLLED VOC MASS EMISSION RATE: 

Any person petitioning for an exemption pursuant to Section 4021 shall determine the 

maximum uncontrolled VOC mass emission rate as follows:

4087.21POTENTIAL TO EMIT ≥ 25 TPY: A stationary source with a potential to emit 25 

tons per year or more of VOC from organic chemical plants shall determine the 

maximum uncontrolled VOC emission rate by using emission testing pursuant to 

Section 41009.

4087.2 POTENTIAL TO EMIT <25 TPY: A stationary source with a potential to emit of 

less than 25 tons per year of VOC from organic chemical plants shall determine 

the maximum uncontrolled VOC emissions by using engineering assessment 

pursuant to Section 4098 or emission testing pursuant to Section 41009.

4087.3 OPEN-TYPE PROCESS TANK: A person shall determine the maximum 

uncontrolled VOC emissions by using the most recent version of EPA’s computer 

model, WATER8. The concentration of each individually speciated VOC in the 

process stream with the potential to be emitted into the atmosphere, shall be 

determined by EPA Method 305 of 40 CFR Part 63, Appendix A. 

4087.4 DETERMINATION CRITERIA: The emission testing or engineering assessment 

shall be made using one of the following criteria: 

a. FOR CONTINUOUS PROCESS: The maximum daily uncontrolled VOC 

emissions shall be determined based on District permitted or highest 

process/production rate in any calendar day. 

b. FOR BATCH PROCESS: The maximum daily uncontrolled VOC 

emissions shall be the highest emission rate in any 24 hour period based 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

July 23, 1998 XX-XX-08 464-15 

on District permitted or highest process/production rate. An emission 

profile shall be used to determine highest 24 hour period emission rate 

and shall be submitted along with the exemption petition pursuant to 

Section 4021. 

4098 DETERMINATION OF VOC MASS EMISSION RATE USING ENGINEERING 

ASSESSMENT: A person shall conduct engineering assessment which includes, but is 

not limited to, the following: 

4098.1 Previous test results provided the tests are representative of current operating 

practices at the process unit. 

4098.2 Bench-scale or pilot-scale test data representative of the process under 

representative operating conditions. 

4098.3 Maximum flow rate, VOC emission rate, concentration, or other relevant 

parameter specified or implied within a permit limit applicable to the process vent. 

4098.4 Design analysis based on accepted chemical engineering principles, measurable 

process parameters, or physical or chemical laws or properties. Examples of 

analytical methods include, but are not limited to: 

a. Use of material balances based on process stoichiometry to estimate 

maximum VOC concentrations, 

b. Estimation of maximum flow rate based on physical equipment design 

such as pump or blower capacities, 

c. Estimation of VOC concentrations based on saturation conditions. 

4098.5 All data, assumptions, and procedures used in the engineering assessment shall 

be documented and provided to the District. 

Not withstanding the provisions of this section, the Air Pollution Control Officer may 

require emission testing pursuant to Section 41009 to verify compliance. 

41009 DETERMINATION OF VOC MASS EMISSION RATE USING EMISSION TESTING: 

41009.1A person shall conduct emission testing using test methods in Section 502 and 

the following test durations: 

a. CONTINUOUS PROCESS: The test shall consist of three 1-hour runs. 

b. BATCH PROCESS: The duration shall be the time from the start to the 

completion of a batch cycle unless the test is conducted under worstcase condition described in Section 4121.3 (b) (1) or (2). For batch cycle 

or test period greater than 3 hours, a single test conducted over the 

duration of the batch cycle or test period shall be used for emission 

determination. For batch cycle or test period less than or equal to 3 hour, 

testing shall include three 1-hour runs. 

41009.2A person conducting any emission test for the purpose of the petition for 

exemption pursuant to Section 4021 shall comply with the following source test 

notification and reporting requirements: 

a. At least 30 days prior to the scheduled test date submit the source test 

plan. 

b. At least 7 days prior to the source test date notify Air District staff of the 

exact date and time scheduled for the source test. 

c. The source test observation and evaluation fee as authorized under Rule 

301-PERMIT FEES - STATIONARY SOURCE must be submitted with 

the petition for exemption. 

4110 CALCULATION FOR VOC MASS EMISSION RATE, CONTROL EFFICIENCY, AND 

COMBINED SYSTEM EFFICIENCY

4110.1 VOC MASS EMISSION RATE: VOC mass emission rate shall be calculated 

using the following equation: 

VOC Mass Emission Rate = (Q)(C)(60 min/hr)
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

464-16 July 23, 1998 XX-XX-08

Where: Q = the flow rate, in scfm, as determined by Section 4098 or 

Sections 41009 and 502. 

C = the VOC mass concentration, in lb/scf, as determined by 

Section 4098 or Sections 41009 and 502. 

4110.2 CONTROL EFFICIENCY: Expressed in percent, control efficiency is the ratio of 

the weight of the VOC removed by the control device from the effluent stream 

entering the control device to the weight of VOC in the effluent stream entering 

the control device, both measured simultaneously. Control efficiency shall be 

determined using the following equation: 

( ) %Control Efficiency 0 ×100% − =

i

i

M

M M

Where: Mi = inlet VOC mass emission rate, in lb/hr. 

Mo = outlet VOC mass emission rate, in lb/hr. 

4110.3 COMBINED SYSTEM EFFICIENCY: A capture efficiency of 100% can be 

assumed for any capture system which is piped to the control equipment and has no leak. 

The combined system (capture and control) efficiency is calculated as follows: 

%System Efficieny = %CE× %CLE / 100%

Where: %System Efficiency = %capture and control efficiency. 

%CE = %control efficiency, as determined by 

Section 4110.2. 

%CLE = %capture efficiency, as determined by 

Section 502.2 

4121 PROCEDURES FOR DEMONSTRATING COMPLIANCE: A person shall demonstrate 

compliance with Sections 301, 302, 303, 304, 305 and 306.2 by using the applicable 

procedure listed below, Section 4121.1, or 4121.2, or 4121.3. 

4121.1 A stationary source with a potential to emit of less than 25 tons per year of VOC 

from the organic chemical plants may use the condenser exit gas temperature to 

calculate the removal efficiency of the condenser in demonstrating the required 

emission reduction if the condenser system is equipped with a temperature 

sensor and recorder, such that the condenser exit gas temperature can be 

measured at 15-minute intervals when the condenser is functioning in cooling a 

vent stream. Not withstanding the requirements in this section, the Air Pollution 

Control Officer may require source testing to verify compliance. 

4121.2 A stationary source with a potential to emit of less than 25 tons per year of VOC 

from the organic chemical plants shall determine percent reduction by conducting 

a performance test, using the procedure in Section 4121.3, or a design 

evaluation. The design evaluation shall include documentation demonstrating that 

the control device being used achieves the required reduction during the emission 

episodes in which it is functioning in reducing emissions. This documentation 

shall include a description of the gas stream which enters the control device, flow 

and VOC content, and all pertinent control device operating parameters which 

resulted in the required reduction. The calculation shall be based on engineering 

assessment described in Section 4098. Not withstanding the requirements in 

4121.2, the Air Pollution Control Officer may require source testing to verify 

compliance. 

4121.3 A stationary source with a potential to emit of greater than or equal to 25 tons per 

year of VOC from the organic chemical plants shall demonstrate compliance by 

conducting a performance test based on the following procedure: 

a. Perform test pursuant to Sections 41009 and 502 at the inlets and outlets 

of the capture and control devices and use the equations in Section 4110
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

July 23, 1998 XX-XX-08 464-17 

to determine percent combined system (capture and control) efficiency 

and control efficiency in total VOC.

b. Test capture and control devices over absolute or hypothetical worstcase conditions, or over normal conditions, provided the operation of the 

devices is limited to the conditions that existed during testing by District 

permit. 

1. ABSOLUTE WORST-CASE CONDITION: It is either: 

i. The period in which the inlet to the control device 

contains at least 50 percent of the maximum VOC load 

capable of being vented to the control device over any 8-

hour period, or 

ii. A 1-hour period of time in which the inlet to the control 

device will contain the highest VOC mass loading rate, in 

lbs/hr, capable of being vented to the control device. An 

emission profile as described in Section 208 shall be 

used to determine maximum VOC loading periods. 

2. HYPOTHETICAL WORST-CASE CONDITION: The simulated 

test condition that, at a minimum, contain the highest total 

average hourly VOC load that would be predicted to be vented to 

the control device using the emissions profile described in 

Section 208. The highest total average hourly VOC load is 

determined by first dividing the VOC emissions from each 

episode by the duration of each episode, in hours, and selecting 

the highest hourly block average. 

3. NORMAL CONDITION: Test condition which is based on the 

process/production rate, stream composition, temperature, and 

flow rate limits set in District permit. 

4132 VIOLATION: Any leak originally identified by the Air Pollution Control Officer is a 

violation. 

500 MONITORING AND RECORDS

501 RECORD KEEPING: In addition to any existing permit conditions issued pursuant to 

Rule 201-GENERAL PERMIT REQUIREMENTS, a person subject to this rule shall 

comply with the following requirements: 

501.1 CONTROL EQUIPMENT: A person using an emission control system pursuant 

to Section 300 shall maintain on-site the records required by the Operation and 

Maintenance Plan in Section 4043 on a daily basis. 

501.2 ORGANIC COMPOUND AND WASTEWATER PROCESSING RECORDS: A 

person subject to the capture and/or control requirement of Sections 301, 302, 

303, 304, 305 or 306 shall maintain on-site a current list of organic compounds in 

use including the vapor pressure of each compound at 20o

C. In addition, a 

person shall: 

a. FOR CONTINUOUS PROCESS: Keep daily records on-site of the types 

and amounts of organic compounds used and produced by each organic 

chemical manufacturing process unit. Keep daily records on-site of the 

amount of wastewater received, managed or treated by each wastewater 

process equipment. 

b. FOR BATCH PROCESS: Keep records on-site of each production batch 

step, including starting and completion time and date, and the types and 

amounts of organic compounds used and produced by each organic 

chemical manufacturing process unit. Keep records on-site of each 

treatment batch, including starting and completion time and date, and the 

amount of wastewater received, managed or treated by each wastewater 

process equipment. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

464-18 July 23, 1998 XX-XX-08

501.3 WASTEWATER REPORT: For any equipment that receives, manages or treats 

wastewater, a person shall maintain on-site an annual wastewater report 

prepared pursuant to Section 4065. 

501.4 EXEMPTION, STATIONARY SOURCE WITH ≤ 15 POUNDS/DAY 

UNCONTROLLED VOC EMISSION FROM ORGANIC CHEMICAL PLANTS: A 

person seeking to satisfy the conditions of Section 110 shall: 

a. FOR CONTINUOUS PROCESS: Keep daily records on-site of the types, 

andamounts, and VOC content of organic compounds used and 

produced. 

b. FOR BATCH PROCESS: Keep records on-site of the types, and

amounts, and VOC content of organic compounds used and produced by 

each production batch including starting and completion time and date. 

501.5 EXEMPTION, PROCESS VENT, PROCESS TANK, NON-PHARMACEUTICAL 

NON-COSMETIC WITH ≤ 15 POUNDS/DAY UNCONTROLLED VOC 

EMISSION: A person seeking to satisfy the conditions of Section 111, 112 or 113 

shall: 

a. FOR CONTINUOUS PROCESS: Keep daily records on-site of the types,

andamounts, and VOC content of organic compounds used and 

produced by each organic chemical manufacturing process unit. 

b. FOR BATCH PROCESS: Keep records on-site of each production 

batch, including starting and completion time and date, and types, vapor 

pressure, and amounts, and VOC content of organic compounds used 

and produced by each organic chemical manufacturing process unit. 

501.6 EXEMPTION, RESEARCH AND DEVELOPMENT OPERATIONS: A person 

seeking to satisfy the conditions of Section 114 shall keep the following records 

on-site: 

a. For cleanup materials, monthly records of the types, and amounts, and 

VOC content of cleanup materials used and shall determine the daily 

usage by dividing the monthly usage by the number of operating days 

during the month, and 

b. For all other organic compounds, daily records of type, and amount, and 

VOC content of each organic compound used and produced. When 

requested by the Air Pollution Control Officer, the VOC emissions for the 

specified day shall be calculated and submitted to the Air Pollution 

Control Officer. 

501.7 EXEMPTION, SOLVENT CLEANING OF OPERATION REGULATED BY FDA: 

A person seeking to satisfy the conditions of Section 116 shall keep daily records 

on-site of the types, and amounts, and VOC content of cleaning solvent used. 

501.8 CLEANUP MATERIALS: Monthly records of the total applied volume of materials 

used for cleanup shall be kept on-site. The records shall include the 

name/code/manufacturer and maximum volatile organic compound content of the 

cleanup material, as applied, after any mixing or thinning as recommended by the 

manufacturer. The VOC content shall be displayed as grams of volatile organic 

compound per liter of coating (or pounds of volatile organic compound per gallon), 

including water and exempt compounds. 

501.9 SOURCE TEST REPORT: Each owner or operator of a stationary source shall 

keep on-site copies of all applicable source reports. 

501.10 DURATION OF RECORDS: Such records (electronic files or on paper) shall be 

maintained on-site for a continuous five-year period and made available to the Air 

Pollution Control Officer upon request. 

502 TEST METHODS: The performance tests for demonstrating compliance with the 

requirements of this rule shall be run using the following: 

502.1 VOC MASS EMISSION RATE OR CONTROL EFFICIENCY: VOC mass 

emission rate or control efficiency shall be determined in accordance with EPA 

Method 18, 25 or 25A, EPA Method 1 or 1A, EPA Method 2, 2A, 2B or 2C, EPA 

Method 3 and EPA Method 4 (whichever combination most applicable). 

502.2 DETERMINATION OF CAPTURE COLLECTION EFFICIENCY: 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

July 23, 1998 XX-XX-08 464-19 

Efficiency of the collection system shall be determined in accordance with EPA 

“Guidelines for Determining Capture Efficiency, January 9, 1995". Individual 

collection efficiency test runs subject to the U.S. EPA technical guidelines shall be 

determined by: Collection efficiency shall be determined in accordance with the 

U.S. EPA technical guideline document, “Guidelines for Determining Capture 

Efficiency,” dated January 9, 1995. Individual capture efficiency test runs subject 

to U.S. EPA technical guidelines shall be determined by:

a. Applicable U.S. EPA methods 204, 204A, 204B, 204C, 204E, and/or 

204F; or 

b. The South Coast Air Quality Management District “Protocol for 

Determination of Volatile Organic Compound (VOC) Capture Efficiency”; 

or 

c. Any other method approved in writing by the U.S. EPA, the California Air 

Resources Board, and the Air Pollution Control Officer. 

502.3 VOC CONCENTRATION IN WASTEWATER: The total VOC concentration in 

wastewater shall be determined in accordance with EPA Method 305 or 25D. 

502.4 VAPOR PRESSURE: Vapor pressure of a VOC shall be determined in 

accordance with ASTM Method D2879-8697 (2007), or may be obtained from the 

most current edition of a published source, including, but not limited to: 

a. The Vapor Pressure of Pure Substances, Boublik, Fried, and Hala; 

Elsevier Scientific Publishing Company, New York. 

b. Perry's Chemical Engineer's Handbook, McGraw-Hill Book Company. 

c. CRC Handbook of Chemistry and Physics, Chemical Rubber Publishing 

Company. 

d. Lange's Handbook of Chemistry, John Dean, editor, McGraw-Hill Book 

Company. 

502.5 LEAK DETECTION: Concentration of VOC in leaks shall be measured using a 

portable gas detector as prescribed in U.S. EPA Method 21. 

502.6 MULTIPLE TEST METHODS: When more than one test method or set of test 

methods is specified for any testing, a violation of any requirement of this rule 

established by any one of the specified test methods or set of test methods shall 

constitute a violation of this rule.