SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25, 2008 464-1 

RULE 464 ORGANIC CHEMICAL MANUFACTURING OPERATIONS 

Adopted 7-23-98 

(Amended 9-25-08)

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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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 PETITION FOR EXEMPTION 

402 AUTHORITY TO CONSTRUCT APPLICATION 

403 OPERATION AND MAINTENANCE PLAN 

404 PROCEDURE FOR PROCESSING AN OPERATION AND MAINTENANCE PLAN 

405 WASTEWATER REPORT 

406 CALCULATION FOR VOC COMPOSITE PARTIAL VAPOR PRESSURE 

407 DETERMINATION OF MAXIMUM UNCONTROLLED VOC MASS EMISSION RATE 

408 DETERMINATION OF VOC MASS EMISSION RATE USING ENGINEERING 

ASSESSMENT 

409 DETERMINATION OF VOC MASS EMISSION RATE USING EMISSION TESTING 

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

SYSTEM EFFICIENCY 

411 PROCEDURES FOR DEMONSTRATING COMPLIANCE 

412 VIOLATION 

500 MONITORING AND RECORDS 

501 RECORDKEEPING 

502 TEST METHODS 
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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 401 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 401 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 401 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 401 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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115 EXEMPTION, LABORATORY EQUIPMENT SOLVENT CLEANING: The provisions of 

Sections 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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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 September 25, 2008 

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 the 
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September 25, 2008 464-7 

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: 

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 
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464-8 September 25, 2008 

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 411. 

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 411 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 411 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 406, 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. 

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 406, of 26 mm Hg (0.5 psi) 

or more at 20 o

C (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 411 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 411 and 

is permitted pursuant to Rule 201-GENERAL PERMIT REQUIREMENTS. 
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September 25, 2008 464-9 

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 406, 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 406, of greater 

than 26 mm Hg at 20 o

C (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 411 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 411 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. 

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 411 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 411 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 semiannually 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: 
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464-10 September 25, 2008 

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 411 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 semiannually 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 semiannually 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. 

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 406, of greater than 26 mm Hg at 20 o

C (0.5 

psi at 68 o

F) 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, 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25, 2008 464-11 

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 411. 

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 406, 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 

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

process units and piping 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 September 25, 2009, 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 50 grams per liter (0.42 pounds per 

gallon). 

308.5 Effective September 25, 2009, 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 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 407 and all pertinent information to support a basis for granting/denying 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

464-12 September 25, 2008 

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: 

401.1 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. 

401.2 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. 

402 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 emission control 

equipment, without modification to the system, results in compliance with this rule. 

403 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 emissionsproducing 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. 

404 PROCEDURE FOR PROCESSING AN OPERATION AND MAINTENANCE PLAN:

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

the Operation and Maintenance Plan meets the requirements of Section 403 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. 

404.2 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. 

405 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 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25, 2008 464-13 

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: 

405.1 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. 

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

representing the most recent year of operation. 

405.3 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. 

406 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 260-96 (2006). 

Ww = Weight of water, in grams as determined by ASTM D 3792-05. 

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

ASTM E 260-96 (2006). 

Mwi

 = Molecular weight of the “i”th VOC compound, in grams per g-mole, 

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. 

407 DETERMINATION OF MAXIMUM UNCONTROLLED VOC MASS EMISSION RATE: Any 

person petitioning for an exemption pursuant to Section 401 shall determine the maximum 

uncontrolled VOC mass emission rate as follows:

407.1 POTENTIAL 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 409.

407.2 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 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

464-14 September 25, 2008 

maximum uncontrolled VOC emissions by using engineering assessment pursuant to 

Section 408 or emission testing pursuant to Section 409.

407.3 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. 

407.4 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 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 401. 

408 DETERMINATION OF VOC MASS EMISSION RATE USING ENGINEERING 

ASSESSMENT: A person shall conduct engineering assessment which includes, but is not 

limited to, the following: 

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

practices at the process unit. 

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

representative operating conditions. 

408.3 Maximum flow rate, VOC emission rate, concentration, or other relevant parameter 

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

408.4 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. 

408.5 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 409 to verify compliance. 

409 DETERMINATION OF VOC MASS EMISSION RATE USING EMISSION TESTING: 

409.1 A 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 worst-case 

condition described in Section 411.3 (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. 

409.2 A person conducting any emission test for the purpose of the petition for exemption 

pursuant to Section 401 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. 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25, 2008 464-15 

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. 

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

COMBINED SYSTEM EFFICIENCY

410.1 VOC MASS EMISSION RATE: VOC mass emission rate shall be calculated using 

the following equation: 

VOC Mass Emission Rate = (Q)(C)(60 min/hr)

Where: Q = the flow rate, in scfm, as determined by Section 408 or 

Sections 409 and 502. 

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

Section 408 or Sections 409 and 502. 

410.2 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. 

410.3 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 Efficiency = %CE× %CLE / 100%

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

%CE = %control efficiency, as determined by 

Section 410.2. 

%CLE = %capture efficiency, as determined by 

Section 502.2 

411 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 411.1, or 411.2, or 411.3. 

411.1 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. 

411.2 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 411.3, 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 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

464-16 September 25, 2008 

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 408. Not withstanding the requirements in 411.2, the Air Pollution Control 

Officer may require source testing to verify compliance. 

411.3 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 409 and 502 at the inlets and outlets of 

the capture and control devices and use the equations in Section 410 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 worst-case 

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. 

412 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 403 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 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

September 25, 2008 464-17 

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. 

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 405. 

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, 

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

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

amounts, 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, 

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 onsite: 

a. For cleanup materials, monthly records of the types, 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, 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 onsite of the types, 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 
SACRAMENTO METROPOLITAN AQMD RULES AND REGULATIONS 

464-18 September 25, 2008 

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 COLLECTION EFFICIENCY: 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 D2879-97 (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.