YOLO-SOLANO AIR QUALITY MANAGEMENT DISTRICT

RULE 2.21 - VAPOR CONTROL FOR ORGANIC LIQUID STORAGE AND TRANSFER
(Adopted March 23, 1994)

INDEX

100 GENERAL

101 PURPOSE

102 APPLICABILITY

110 EXEMPTION - SMALL CAPACITY STORAGE TANKS

111 EXEMPTION - SCHEDULED MAINTENANCE

112 EXEMPTION - LOW VOLUME LOADING FACILITIES

113 EXEMPTION - SMALL CAPACITY GASOLINE STORAGE CONTAINERS

114 EXEMPTION - CONTAINERS SERVICED BY EXEMPTED DELIVERY VESSELS

115 EXEMPTION - IMPLEMENTS OF HUSBANDRY

116 EXEMPTION - SUBMERGED FILL PIPE


200 DEFINITIONS

201 BACKGROUND

202 EFFICIENCY

203 GAS TIGHT

204 GASOLINE

205 LEAK FREE

206 LOADING FACILITY

207 MAINTENANCE

208 ORGANIC LIQUID

209 STORAGE CONTAINER

210 SUBMERGED FILL PIPE

211 VAPOR TIGHT

212 VIEWPORT

300 STANDARDS

301 STORAGE OF PETROLEUM PRODUCTS

302 ORGANIC LIQUID LOADING

303 ORGANIC LIQUID TRANSFER TO STATIONARY STORAGE CONTAINERS

304 OPERATING PRACTICES

305 TANK CLEANING REQUIREMENTS

306 OZONE EXCESS DAY PROHIBITION

307 VIEWPORT INSTALLATION


400 ADMINISTRATIVE REQUIREMENTS

401 PRIMARY SEAL INSPECTION

402 SECONDARY SEAL AND FITTING INSPECTION

403 MAINTENANCE PLAN

404 PETITION FOR CONTINUING EXEMPTIONS

405 COMPLIANCE SCHEDULE

500 MONITORING AND RECORDS

501 RECORDS

502 TEST METHODS

503 TANK CLEANING ANNUAL SOURCE TEST REQUIREMENT


100 GENERAL

101 PURPOSE: To limit emissions of volatile organic compounds from the storage and transfer of organic liquids.
102 APPLICABILITY: This Rule applies to all facilities that transfer or store organic liquids having an absolute vapor pressure equal to or greater than 1.5 psia.
110 EXEMPTION - SMALL CAPACITY STORAGE TANKS: The provisions of this Rule doe not apply to stationary storage tanks having a capacity of equal to or less than 250 gallons.
111 EXEMPTION - SCHEDULED MAINTENANCE: The provisions of Section 301.1 shall not apply to tanks involved in periodic scheduled maintenance or replacement operations of primary or secondary seals that cause the emissions of volatile organic compounds. Such periodic scheduled maintenance shall be done in accordance with a plan as defined in Section 403 which has prior written approval of the Air Pollution Control Officer. Scheduled periodic maintenance operations shall not be conducted from May 15 through October 15 of any year.
112 EXEMPTION - LOW VOLUME LOADING FACILITIES: Facilities for dispensing to delivery vessels that do not have more than 4,000 gallons per day throughput are exempt from the requirements of Section 302.2 of this Rule when dispensing to delivery vessels.
113 EXEMPTION - SMALL CAPACITY GASOLINE STORAGE CONTAINERS: Stationary gasoline storage containers installed prior to January 1, 1979 and having a capacity of 2,000 gallons or less are exempt from the requirements of Section 302.2 of this Rule.
114 EXEMPTION - CONTAINERS SERVICED BY EXEMPTED DELIVERY VESSELS: Delivery vessel containers that are in turn are used exclusively to service exempted storage containers are exempt from the requirements of Section 302.2 of this Rule.
115 EXEMPTION - IMPLEMENTS OF HUSBANDRY: Stationary storage containers of less than 550 gallons capacity and used exclusively for the fueling of implements of husbandry are exempt from the requirements of Sections 302 and 303.
116 EXEMPTION - SUBMERGED FILL PIPE: Storage containers having a vapor control system as specified in Sections 301.2 and 301.3 of this Rule are exempted from the requirement for a submerged fill pipe.

200 DEFINITIONS

201 BACKGROUND: That concentration of hydrocarbons (expressed as methane) measured at least 3 meters (10 feet) upwind from the source and not influenced by any specific emission point.
202 EFFICIENCY: A comparison of controlled emissions to those emissions that would occur from a fixed or cone roof tank in the same product service without a vapor loss control system. Baseline emissions shall be calculated using the criteria in American Petroleum Institute Bulletin 2518.
203 GAS TIGHT: A concentration of total organic compounds which does not exceed 10,000 ppm (expressed as methane) above background, as determined by a method specified in Section 502.2 of this Rule.
204 GASOLINE: Any petroleum distillate having a Reid Vapor Pressure of 4 pounds per square inch or greater.
205 LEAK FREE: A liquid leak of less than three drops per minute.
206 LOADING FACILITY: Any stationary source with organic liquid loading equipment.
207 MAINTENANCE: The work of keeping something in proper condition such as performing inspection and repair necessary to preclude breakdown of equipment.
208 ORGANIC LIQUID: Compounds and mixtures of compounds of carbon which have an absolute vapor pressure of 1.5 pounds per square inch, as determined per Section 502.4 of this Rule, under actual storage conditions.
209 STORAGE CONTAINER: Any vessel other than a motor vehicle fuel tank used to hold organic liquids.
210 SUBMERGED FILL PIPE: Any discharge pipe or nozzle which meets either of the following conditions:

210.1 Where the tank is filled from the top, the end of the discharge pipe or nozzle is totally submerged when the liquid level is 6 inches from the bottom of the tank.

210.2 Where the tank is filled from the side, the end of the discharge pipe or nozzle is totally submerged when the liquid level is 18 inches from the bottom of the tank.
211 VAPOR TIGHT: A condition that exists when the concentration of organic compounds does not exceed 10,000 ppm (expressed as methane) above background as determined by methods specified in Section 502.5 of this Rule.
212 VIEWPORT: An accessible opening in the fixed roof of an internal floating roof tank that measures at least 30 inches on each side or at least 30 inches in diameter.
300 STANDARDS

301

STORAGE OF PETROLEUM PRODUCTS:
301.1 Containers Larger Than 40,000 Gallons:
A person shall not store organic liquid in any stationary storage container of more than 40,000 gallons capacity, unless such container is:

  1. A pressure tank maintaining working pressures sufficient at all times to prevent organic vapor or gas loss to the atmosphere; or
  2. Designed and equipped with one of the vapor loss control devices specified in Sections 301.2, 301.3, or 301.4 of this Rule.

301.2 Floating Roof:
The vapor loss control device may be a floating roof equipped with a closure device consisting of a floating pan-type roof or a pontoon-type or double deck cover. All floating roofs must rest on the surface of the liquid contents.

  1. The closure device shall consist of two seals, one above the other; the one below shall be referred to as the primary seal, and the one above shall be referred to as the secondary seal. The closure device shall comply with the requirements specified in Sections 301.5 through 301.8 of this Rule.
  2. A floating roof shall not be used if the organic liquid stored has a true vapor pressure of 11 psia or greater under actual storage conditions as determined by the methods specified in Section 502.3 of this Rule.

301.3 Internal Floating Roof:

The vapor loss control device may be a fixed roof with an internal floating-type cover. A fixed roof container with an internal-floating-type cover shall not be used if the organic liquid stored has a true vapor pressure of 11 psia or greater under actual storage conditions as determined by the methods specified in Section 502.3 of this Rule.

301.4 Vapor Recovery System:

The vapor loss control device may be a vapor recovery system capable of collecting and processing all organic vapors and gases and which meets the following requirements:

  1. The system shall have a recovery efficiency of at least 95% by weight as determined by methods specified in Section 502.1 of this Rule.
  2. Any tank gauging or sampling device on a tank vented to the vapor recovery system shall be equipped with a gas-tight cover which shall be closed at all times, except during gauging or sampling.
  3. All pressure-vacuum valves shall be constructed and maintained in a gas-tight condition when the valve is seated.

301.5 Closure Device Requirements:

The closure device on any floating roof container subject to Section 301.2 of this Rule shall meet the following requirements:

  1. Any secondary seal shall extend from the roof to the tank shell and shall not be attached to the primary seal.
    1. For secondary seals installed after March 23, 1995, no gap between the tank shell and the seal shall exceed:
      1. 0.06 inch.
      2. 0.02 inch for a cumulative length greater than 5% of the circumference of the tank excluding gaps less than 1.79 inches from vertical weld seams.
  2. All openings in the roof, except pressure-vacuum valves, sampling wells, and gauging wells shall meet the following requirements:
    1. The opening shall provide a projection below the liquid surface to prevent belching of liquid and to prevent entrained or formed organic vapor from escaping from the liquid contents of the tanks.
    2. The opening, except for floating roof legs, shall be equipped with a cover, seal or lid, which shall be closed at all times with no measurable gap exceeding 1/8 inch, except when the opening is in use.
  3. Pressure-vacuum valves shall be set to within 10% of the maximum allowable working pressure of the roof.
  4. Solid sampling and gauging wells shall meet the following requirements:
    1. The well shall provide a projection below the liquid surface.
    2. The well shall be equipped with a cover, seal or lid, which shall be closed at all times with no measurable gap exceeding 1/8 inch, except when the well is in use.
  5. Slotted sampling and gauging wells shall meet the following requirements:
    1. The well shall provide a projection below the liquid surface.
    2. The well shall be equipped with one of the following closure devices which shall be in place at all times except when the well is in use:
      1. An internal float designed to minimize the gap between the float and the well, provided that the gap shall in no case exceed 1/2 inch.
      2. A capped internal sleeve designed to minimize the gap between the sleeve and the well, provided that the gap shall in no case exceed 1/2 inch.
      3. An internal sleeve with no visible gaps between the sleeve and the well and a cover, seal or lid on the well with no measurable gaps exceeding 1/8 inch.
  6. Any roof drain shall be provided with a slotted membrane fabric cover, or equivalent, that covers at least nine-tenths of the area of the opening.
  7. The gap between sampling wells, gauging wells, and similar fixed projections through a floating roof, such as anti-rotational pipes, and the roof shall be added to the gaps measured to determine compliance of the secondary seal and in no case shall exceed 1/2 inch.

301.6 Metallic Shoe Seal Requirements:

For any container which uses a metallic shoe seal to comply with Section 301.2, the seal shall meet the following requirements:

  1. There shall be no holes, tears, or openings which allow the emission of organic vapors through the secondary seal. There shall be no holes, tears, or openings in the primary seal envelope surrounding the annular vapor space enclosed by the roof edge, stored liquid surface, shoe, and seal fabric.
  2. Metallic-shoe-type seals installed on or after September 1, 1978, shall be installed so that one end of the shoe extends into the stored liquid and the other end extends a minimum vertical distance of 24 inches above the stored liquid surface.
  3. The geometry of the shoe shall be such that the gap between the shoe and the tank shell shall not exceed twice the seal gap criteria for a vertical length greater than 18 inches.

301.7 Welded Tanks With Metallic Shoe Seals:

For any welded tank shell which uses a metallic shoe seal to comply with Section 301.2 of this Rule, the seal shall meet the following requirements:

  1. No gap between the tank shell and the primary seal shall exceed:
    1. 1-1/2 inch.
    2. 1/2 inch for a cumulative length greater than 10% of the circumference of the tank.
    3. 1/8 inch for a continuous length of more than 10% of the circumference of the tank.
    4. 1/8 inch for a cumulative length greater than 40% of the circumference of the tank.
  2. No gap between the tank shell and the secondary seal shall exceed:
    1. 1/2 inch.
    2. 1/8 inch for a cumulative length greater than 5% of the circumference of the tank.
  3. The secondary seal shall allow easy insertion of probes up to 1-1/2 inch in width in order to measure gaps in the primary seal.

301.8 Resilient Toroid Seal Requirements:

For any container which uses a resilient toroid seal to comply with Section 301.2 of this Rule, the seal shall meet the following requirements:

  1. There shall be no holes, tears, or openings which allow the emission of organic vapors through the secondary seal. There shall be no holes, tears, or openings in the primary seal envelope surrounding the annular vapor space enclosed by the roof edge, seal fabric and primary seal.
  2. For primary seals no gap between the tank shell and the seal shall exceed:
    1. 1/2 inch.
    2. 1/8 inch for a cumulative length greater than 5% of the circumference of the tank.
  3. For secondary seals no gap between the tank shell and the secondary seal shall exceed:
    1. 1/2 inch.
    2. 1/8 inch for a cumulative length greater than 5% of the circumference of the tank.
  4. The secondary seal shall allow easy insertion of probes up to 1/2 inch in width in order to measure gaps in the primary seal.
302

ORGANIC LIQUID LOADING:

302.1 California Air Resources Board Certified System: A person shall not load organic liquids into any tank truck, trailer, or railroad tank car from any loading facility unless the loading facility is equipped with a California Air Resources Board certified vapor collection and disposal system.

302.2 Vapor Recovery Criteria: A person shall not transfer or permit to be transferred organic liquids into any tank truck, trailer, or railroad tank car unless the emissions to the atmosphere do not exceed 0.08 pounds per 1,000 gallons of organic liquids transferred as determined by methods specified in Section 502.6 of this Rule.

302.3 Equipment Maintenance: All equipment associated with organic liquid loading equipment shall be maintained to be leak free, vapor tight,and in good working order.

302.4 Disconnect Criteria: During transfer operations, the allowed drainage during disconnect of delivery vessels shall be no more than ten (10) milliliters liquid, averaged over three disconnects.

302.5 Submerged Fill:

All loading operations shall be accomplished by submerged fill.

302.6 Compliance With Required Vapor Recovery:

Facilities that are exempt from the requirements of Sections 302.1 and 303.1 of this Rule shall not load delivery vessel storage containers that in turn service certified storage containers subject to the requirements of Section 303.1 of this Rule.

302.7 Loading of Exempt Delivery Vessels: No person shall load gasoline into any delivery vessel granted an exemption pursuant to Section 404 of this rule unless such delivery vessel is loaded by submerged filling.

303

ORGANIC LIQUID TRANSFER TO STATIONARY STORAGE CONTAINERS:

303.1 Vapor Recovery Required:

No person shall transfer or permit the transfer of organic liquid into any storage container with a capacity of more than 250 gallons unless such transfer is made employing a vapor control system that prevents the release to the atmosphere of not less than 95 percent by weight of the organic vapors displaced, excluding methane, and unless stationary storage containers are also equipped with a submerged fill pipe.

  1. For gasoline, the vapor control system shall be certified by the California Air Resources Board and maintained and operated as certified.
  2. A storage container meeting the requirements of Sections 301.2 or 301.3 of this Rule is considered to meet the requirements of this Section.

303.2 Delivery Vessel Storage Containers:

Delivery vessel storage containers shall be subject to the following requirements:

  1. The storage container shall be designed and maintained to be vapor tight, as determined by methods specified in Section 502.5 of this Rule, under normal operating conditions.
  2. The vapor-laden delivery vessel shall be refilled only through a vapor control system that ensures that such a system is connected before organic liquid is transferred into the delivery vessel.
  3. Organic liquid loading operations shall not exceed the capacity of the vapor control system as determined by methods specified in Section 502.5.a. of this Rule.
  4. The vapor control system shall be maintained and operated in a manner that prevents gauge pressure in the delivery vessel from exceeding 18 inches water column or 6 inches water vacuum.
  5. Submerged fill is required for all exempt delivery vessels.
  6. All delivery vessels that service both exempt and non-exempt storage containers using the same load from a loading facility, shall first service exempt storage containers prior to servicing non-exempt storage containers.
  7. Organic liquid storage compartments of 1,000 gallons or less in delivery vessel storage containers in use are required shall meet the requirements of Section 303.1 of this Rule for delivery to all storage containers that are not exempt from the requirements of Section 303.1 of this Rule.

303.3 Equipment Maintenance:

All equipment associated with delivery operations shall be maintained to be vapor tight, leak free, and in good working order.

303.4 Switch Loading:

When organic liquids with vapor pressures less than 1.5 pounds per square inch at storage conditions are being transferred or stored such that vapors of organic liquids with vapor pressures of 1.5 pounds per square inch or greater can be emitted or vented to the ambient air, such transfer and storage are subject to the requirements of Sections 302.1 and/or 303.1 of this Rule, as applicable.

304 OPERATING PRACTICES:

Organic liquids subject to this Rule shall not be spilled, discarded to sewers, stored in open containers, or handled in any other manner that would result in evaporation to the atmosphere. Spills and leaks resulting from maintenance or repair operations shall not apply provided proper operating practices are employed to minimize evaporation to the atmosphere.
305 TANK CLEANING REQUIREMENTS:

Effective March 23, 1995, the emissions of organic compounds resulting from degassing a tank subject to the requirements of Section 301.1 of this Rule shall be controlled by one of the following methods:

305.1 Liquid balancing in which the resulting organic liquid has a true vapor pressure less than 0.5 psia.

305.2 A control system which collects and processes all organic vapors and gases and has an abatement efficiency of at least 90% by weight. The system shall be operated until the concentration of organic compounds in the tank is less than 10,000 ppm expressed as methane as determined according to Section 502.2 of this Rule.
306 OZONE EXCESS DAY PROHIBITION:

Except as provided in Section 305 of this Rule, tank degassing shall not commence after the District predicts an excess of the Federal or State Ambient Air Quality Standard for ozone for the following day.
307 VIEWPORT INSTALLATION: Effective March 23, 1995, all internal floating roof tanks subject to the requirements of Sections 301.1, 301.6, 301.7, and 301.8 of this Rule that have been degassed shall be equipped with at least three viewing ports.

400 ADMINISTRATIVE REQUIREMENTS

401

PRIMARY SEAL INSPECTION: For all tanks equipped with primary seals subject to the requirements of Section 301.4 of this Rule, the seal shall be inspected for compliance with Sections 301.6, 301.7, and 301.8 of this Rule by the operator at the following times:

401.1 Once every ten years for tanks subject to the requirements of Section 301.5.a.1 of this Rule.

401.2 After March 23, 1995, once every ten years for tanks with internal floating roofs per Section 301.3 of this Rule that satisfy one of the following conditions:

  1. A liquid mounted primary seal, mounted in full contact with the liquid in the annular space between the tank shell and floating roof; or
  2. A vapor mounted primary and a secondary seal; or
  3. A liquid mounted primary and a secondary seal which satisfies the requirements of Sections 301.6, 301.7, or 301.8 of this Rule.

401.3 Once every five years for all other tanks.

402

SECONDARY SEAL AND FITTING INSPECTION: For all tanks equipped with secondary seals subject to the requirements of Section 301.4 of this Rule, the seal shall be inspected for compliance with Sections 301.5, 301.6 , 301.7, and 301.8 of this Rule by the operator at the following times:

402.1 Once every ten years for tanks subject to the requirements of Section 301.5.a.1 of this Rule.

402.2 After March 23, 1995, once every ten years for tanks with internal floating roofs per Section 301.3 of this Rule that satisfy one of the following conditions:

  1. A liquid mounted primary seal, mounted in full contact with the liquid in the annular space between the tank shell and floating roof; or
  2. A vapor mounted primary and a secondary seal; or
  3. A liquid mounted primary and a secondary seal which satisfies the requirements of Sections 301.6, 301.7, or 301.8 of this Rule.

402.3 Annually for all other tanks.

403 MAINTENANCE PLAN: Maintenance plans shall be submitted to the Air Pollution Control Officer at least thirty days prior to anticipated maintenance. The plan shall state the amount and type of emission anticipated, method of calculating emissions, and the reason that the work is necessary, including the effect of not performing the maintenance.
404 PETITION FOR CONTINUING EXEMPTIONS: The owner or operator of any loading facility not subject to the provisions of Section 302 of this Rule and which was in operation before July 1, 1975, and for which the annual throughput to stationary storage containers that are not exempted by Sections 113 and 115 of this Rule does not exceed 500,000 gallons may petition the Air Pollution Control Officer to have the facilities delivery vessels and other independently owned gasoline delivery vessels which are exclusively serviced at such a facility exempted from the provisions of Sections 303.1 and 303.2.a of this Rule. The owner or operator of such a facility must petition annually to renew such exemptions.
405 COMPLIANCE SCHEDULE: Any person who must install or modify vapor recovery equipment in order to meet the requirements of Section 302.2 of this Rule shall meet the following increments of progress:

405.1 Submit an application for Authority to Construct to the Air Pollution Control Officer by September 23, 1994.

405.2 Be in final compliance with Section 302.2 of this Rule by September 23, 1995.

500 MONITORING AND RECORDS

501

RECORDS:

501.1 All facilities subject to the provisions of this Rule shall keep the following records:

  1. a. Tank Capacity;
  2. b. Stock Identification;
  3. c. True Vapor Pressure;
  4. d. Stock Temperature; and
  5. e. All Inspection Reports.

501.2 The owner of operator of a facility or operation exempted under Sections 110 through 116 and Section 404 of this Rule shall maintain the following records:

  1. a. Name. address, and type of facility;
  2. b. Permit number, if applicable;
  3. c. Monthly and annual throughput; and
  4. d. Size and number of storage containers.

In addition facilities shall submit all necessary documentation needed to verify eligibility for continued exemption status to the Air Pollution Control District on a quarterly basis.

501.3 All records required by this Section shall be made available to the Air Pollution Control Officer upon request and shall be maintained for a period of two years.

501.4 Persons subject to this Rule shall maintain records of the results of any testing performed in accordance with Section 502 of this Rule.

502

TEST METHODS: A result by any of the below listed test methods which shows non-compliance with any provision of this Rule shall constitute a violation of this Rule.

502.1 Control Device: Control efficiency and emission rates of control devices shall be determined by CARB Methods 202 and 203.

502.2 Leak Detection: EPA Reference Method 21.

502.3 Vapor Pressure: Vapor pressure may be obtained from standard reference texts or may be determined by ASTM D-2879-83 for absolute vapor pressure or ASTM D-323-82 for Reid vapor pressure determinations.

502.4 Volatile Organic Compound Leaks: EPA Reference Method 21.

502.5 Gasoline Delivery Tank Vapor Tightness: EPA Reference Method 27.

502.6 Vapor Recovery:

  1. 40 CFR 60.503 and EPA Reference Methods 2A, 2B, 25A, and/or 25B, as applicable; or
  2. CARB Method 202 and 203.
503 TANK CLEANING ANNUAL SOURCE TEST REQUIREMENT: Any person operating an emission control system to comply with the requirements of Section 305.2 of this Rule shall test the system annually per the methods specified in Section 502.1 of this Rule.