PLAAPCD RULE 212 STORAGE OF ORGANIC LIQUIDS               
LAST REVISED 06/08/95


               
               
               RULE 212 STORAGE OF ORGANIC LIQUIDS


                         Adopted 05-24-77
    (Revised 06-19-79, 09-25-90, 10-19-93, 11-03-94, 06-08-95)


                             CONTENTS



100  GENERAL

     101  DESCRIPTION
     102  APPLICABILITY  

200  DEFINITIONS

     201  EFFICIENCY
     202  GAS TIGHT
     203  ORGANIC LIQUID
     204  STORAGE TANK
     205  VAPOR PRESSURE 
     206  VOLATILE ORGANIC COMPOUND (VOC)

300  STANDARDS

     301  STORAGE TANKS STORING ORGANIC LIQUIDS WITH A VAPOR
          PRESSURE GREATER THAN 11 PSIA
     302  EXTERNAL FLOATING ROOF
     303  INTERNAL FLOATING ROOF
     304  VAPOR RECOVERY SYSTEM
     305  METALLIC-SHOE-SEAL CRITERIA
     306  WELDED TANKS WITH METALLIC-SHOE-SEALS
     307  RIVETED TANKS WITH METALLIC-SHOE-SEALS
     308  RESILIENT-TOROID-SEAL CRITERIA
     309  WELDED TANKS WITH ZERO GAP SECONDARY SEALS

400  ADMINISTRATIVE

     401  PRIMARY SEAL INSPECTION
     402  RECORDKEEPING
     403  TEST METHODS

500  MONITORING AND RECORDS

     501  RECORDKEEPING
     502  VAPOR PRESSURE DETERMINATION
     503  VAPOR RECOVERY SYSTEM TESTING
     
100  GENERAL

     101  DESCRIPTION:  The purpose of this Rule is to limit
          emissions from storage tanks for organic liquids.  A
          person shall not place, store, or hold in any
          stationary tank, reservoir, or other container any
          organic liquid, unless such tank, reservoir or other
          container is a pressure tank maintaining working
          pressures sufficient at all times to prevent organic
          vapor or gas loss to the atmosphere, or is designed and
          equipped with one of the vapor loss control devices as
          specified , properly installed, properly maintained and
          in good operating order.

     102  APPLICABILITY:

          102.1     Storage Tanks with a Capacity Greater Than
                    40,000 Gallons:  A person shall not store any
                    organic liquid in any stationary tank,
                    reservoir, or other container of more than
                    40,000 gallons capacity, any organic liquid
                    having a vapor pressure greater than 25.8 mm
                    Hg (0.5 psia), unless such tank, reservoir or
                    other container is a pressure tank maintain-
                    ing working pressures sufficient at all times
                    to prevent organic vapor or gas loss to the
                    atmosphere, or is designed and equipped with
                    one of the vapor loss control devices as
                    specified in Sections 301 through 309 of this
                    Rule.

          102.2     Storage Tanks with a Capacity Less Than
                    40,000 Gallons:  A person shall not store any
                    organic liquid in any stationary tank,
                    reservoir, or other container of less than
                    40,000 gallons capacity, any organic liquid
                    having a vapor pressure greater than 25.8 mm
                    Hg (0.5 psia), unless such tank, reservoir or
                    other container is equipped with the
                    following:

               1.   A submerged fill pipe.

               2.   An apparatus of equal efficiency to a
                    submerged fill pipe which has been approved
                    by the Air Pollution Control Officer.

               3.   A vapor loss control device that complies
                    with the requirements of Section 301 through
                    309 of this Rule.

          102.3     Storage Tanks with a Capacity Greater Than
                    20,000 Gallons and Less Than or Equal To
                    40,000 Gallons:  A person shall not store any
                    organic liquid in any stationary tank,
                    reservoir, or other container of more than
                    20,000 gallons, but less than 40,000 gallons
                    capacity, any organic liquid having a vapor
                    pressure greater than 77.5 mm Hg (1.5 psia),
                    unless such tank, reservoir or other
                    container is a pressure tank maintaining
                    working pressures sufficient at all times to
                    prevent organic vapor or gas loss to the
                    atmosphere, or is designed and equipped with
                    one of the vapor loss control devices as
                    specified in Sections 301 through 309 of this
                    Rule.

          102.4     Above Ground Storage Tanks with a Capacity
                    Greater Than 10,000 Gallons and Less Than or
                    Equal To 20,000 Gallons:  A person shall not
                    store any organic liquid in any stationary
                    tank, reservoir, or other container of more
                    than 10,000 gallons, but less than 20,000
                    gallons capacity, any organic liquid having a
                    vapor pressure greater than 77.5 mm Hg (1.5
                    psia), unless such tank, reservoir or other
                    container is equipped with a pressure-vacuum
                    valve which is set to either a pressure
                    within 10% of the maximum allowable working
                    pressure of the tank or at least 25.8 mm Hg
                    (0.5 psia) or is equipped with a vapor loss
                    control device as specified in Sections 301
                    through 309 of this Rule.
                    
200  DEFINITIONS

     201  EFFICIENCY -  A comparison of controlled emissions to
          those emissions which would occur from a fixed or cone
          roof tank in the same product service without a vapor
          control system.

     202  GAS TIGHT -  The concentration of total hydrocarbons,
          measured 1 cm from any source, not to exceed 10,000 ppm
          (expressed as methane) above background, as determined
          by EPA Reference Method 21. Background shall be defined
          as the ambient concentration of organic compounds
          determined at least three (3) meters upwind of the
          potential source and not influenced by any specific
          emissions source.

     203  ORGANIC LIQUID -  All  volatile organic compounds which
          contain hydrogen and which would exist as liquids at
          actual conditions of use or storage.

     204  STORAGE TANK -  Any stationary container, reservoir, or
          tank used for the storage of organic liquids.

     205  VAPOR PRESSURE - The vapor pressure under actual
          storage conditions as determined by the test methods
          specified in Section 502.

     206  VOLATILE ORGANIC COMPOUND (VOC) - Any compound which
          contains at least one atom of carbon, except:
          206.1          Methane
          206.2          Carbon dioxide
          206.3          Carbon monoxide
          206.4          Carbonic acid
          206.5          Metallic carbides or carbonates
          206.6          Ammonium carbonate
          206.7          1,1,1-trichloroethane
          206.8          Methylene chloride
          206.9          2,2-dichloro-1,1,1-trifluoroethane
                         (HCFC-123)
          206.10    2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124)
          206.11    Trichlorofluoromethane (CFC-11)
          206.12    Dichlorodifluoromethane (CFC-12)
          206.13    1,1,1-trichloro-2,2,2-trifluoroethane (CFC-113)
          206.14    1-chloro-1,1-difluoro-2-chloro-2,2-difluoroethane (CFC-114)
          206.15    Chloropentafluoroethane (CFC-115)
          206.16    Pentafluoroethane (HFC-125)
          206.17    1,1,2,2-tetrafluoroethane (HFC-134)
          206.18    Tetrafluoroethane (HFC-134a)
          206.19    1,1-dichloro-1-fluoroethane (HCFC-141b)
          206.20    1-chloro-1,1-difluoroethane (HCFC-142b)
          206.21    1,1,1-trifluoroethane (HFC-143a)
          206.22    Chlorodifluoromethane (HCFC-22)
          206.23    Trifluoromethane (HFC-23)
          206.24    Difluoroethane (HFC-152a)
          206.25    The following four classes of perfluorocarbon
                    compounds:
                    a.   Cyclic, branched, or linear, completely
                         fluorinated alkanes.
                    b.   Cyclic, branched, or linear, completely
                         fluorinated ethers with no
                         unsaturations.
                    c.   Cyclic, branched, or linear, completely
                         fluorinated tertiary amines with no
                         unsaturations.
                    d.   Sulfur-containing perfluorocarbons with
                         no unsaturations and with sulfur bonds
                         only to carbon and fluorine.
          Perfluorocarbon compounds will be assumed to be absent
          from a product or process unless a manufacturer or
          facility operator identifies the specific individual
          compounds (from the broad classes of perfluorocarbon
          compounds) and the amounts present in the product or
          process and provides a validated test method which can
          be used to quantify the specific compounds.

300  STANDARDS

     301  STORAGE TANKS STORING ORGANIC LIQUIDS WITH A VAPOR
          PRESSURE GREATER THAN 11 PSIA:  A person shall not
          store organic liquid with a vapor pressure greater than
          11 psia  in any tank unless such tank is a pressure
          tank maintaining working pressures sufficient at all
          times to prevent organic vapor or gas loss to the
          atmosphere, or designed and equipped with a vapor loss
          control device which meets the requirements of this
          Rule.  Alternatives to pressurized storage tanks are
          the use of a vapor recovery system, external floating
          roof or internal floating roof vapor loss control
          devices.

     302  EXTERNAL FLOATING ROOF:  The vapor loss control device
          may be a floating roof, consisting of a pontoon-type or
          double-deck-type cover that rests on the surface of the
          liquid contents and is equipped with the closure device
          between the tank shell and roof edge.  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.  Seal designs shall be submitted to the Air
          Pollution Control Officer and shall not be installed or
          used unless they are approved by the Air Pollution
          Control Officer as meeting the criteria set forth
          within this Section or the closure requirements of
          Sections 305 through 309, as applicable.

     303  INTERNAL FLOATING ROOF:

          303.1     The vapor loss control device may be a fixed
                    roof with an internal-floating-type cover,
                    provided the cover prevents the release or
                    emission to the atmosphere of organic vapors
                    or gases at an efficiency equivalent to a
                    floating roof closure device which meets the
                    requirements of Section 305, or meets the
                    applicable closure requirements of Sections
                    305 through 309.  The Air Pollution Control
                    Officer shall determine whether equivalence
                    exists.

          303.2     A fixed roof container with an 
                    internal-floating-type cover shall not be used if the
                    organic liquid stored has a vapor pressure
                    greater than 11 psia.

     304  VAPOR RECOVERY SYSTEM:

          304.1     Any installed vapor recovery system shall be
                    a CARB certified vapor recovery system
                    capable of collecting organic vapors and
                    gases, and include a vapor return or disposal
                    system capable of processing such vapors and
                    gases, so as to prevent their emission to the
                    atmosphere at an efficiency of at least 95
                    percent by weight, determined in accordance
                    with the test methods of Section 503.

          304.2     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.

          304.3     All piping, valves and fittings shall be
                    constructed and maintained in a gas tight
                    condition, such that no organic vapor or gas
                    leaks are detectable.     
                    
305  METALLIC-SHOE-SEAL CRITERIA:

          305.1     Metallic-shoe-type seals 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 61 cm (24
                    inches) above the stored liquid surface.

          305.2     The geometry of the shoe shall be such that
                    the maximum gap between the shoe and the tank
                    shell is no greater than double the gap
                    allowed by the seal gap criteria for a length
                    of at least 46 cm (18 inches) in the vertical
                    plane above the liquid surface.

          305.3     There shall be no holes or tears in, or
                    openings through the secondary seal or in the
                    primary seal envelope surrounding the annular
                    vapor space enclosed by the roof edge, stored
                    liquid surface, shoe, and seal fabric.

          305.4     The secondary seal shall extend from the roof
                    to the tank shell and shall not be attached
                    to the primary seal.

          305.5     Any roof drain which opens directly into the
                    organic liquid content in the tank shall be
                    provided with a slotted membrane fabric
                    cover, or equivalent, that covers at least
                    90% of the area of the opening.

          305.6     All openings in the roof, except pressure-
                    vacuum valves, 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 tank and shall be equipped
                    with a cover, seal or lid. The cover, seal,
                    or lid shall at all times be in a closed
                    position, with no measurable gap exceeding
                    0.32 cm (1/8 in.), except when the device or
                    appurtenance is in use. Pressure-vacuum
                    valves located in the roof shall be set to
                    within ten percent of the maximum allowable
                    working pressure of the roof.

     306  WELDED TANKS WITH METALLIC-SHOE-SEALS - Any welded tank
          shell which uses a metallic-shoe-type seal shall meet
          the following conditions:

          306.1     No gap between the tank shell and the primary
                    seal shall exceed 3.8 cm (1-1/2 inches). The
                    cumulative length of all primary seal gaps
                    exceeding 1.3 cm (1/2 inch) shall be not more
                    than 10% of the circumference; the cumulative
                    length of all primary seal gaps exceeding
                    0.32 cm (1/8 inch) shall not be more than 40
                    percent of the circumference. No continuous
                    gap greater than 0.32 cm (1/8 inch) shall
                    exceed 10% of the circumference of the tank.

          306.2     No gap between the tank shell and the
                    secondary seal shall exceed 1.3 cm (1/2
                    inch). The cumulative length of all secondary
                    seal gaps exceeding 0.32 cm (1/8 inch) shall
                    not exceed 5 percent of the circumference of
                    the tank.

          306.3     The secondary seal shall allow easy insertion
                    of probes up to 3.8 cm (1-1/2 inches) in
                    width in order to measure gaps in the primary
                    seal.

     307  RIVETED TANKS WITH METALLIC-SHOE-SEALS - Any riveted
          tank shell which uses a metallic-shoe-seal shall meet
          the following conditions:

          307.1     No gap between the tank shell and the primary
                    seal shall exceed 6.4 cm (2-1/2 in.). The
                    cumulative length of all primary seal gaps
                    exceeding 3.8 cm (1-1/2 in.) shall not be
                    more than 10% of the circumference.          
          
          307.2     The secondary seal shall consist of at least
                    two sealing surfaces, such that the sealing
                    surfaces prevent the emission of organic
                    compounds around the rivets. Serrated sealing
                    surfaces are allowable if the length of
                    serration does not exceed 15.2 cm (6 in.). No
                    gap between the tank shell and the secondary
                    seal shall exceed 1.3 cm (1/2 in.). The
                    cumulative length of all secondary seal gaps
                    exceeding 0.32 cm (1/8 in.) shall not be more
                    than 5% of the circumference.

          307.3     The secondary seal shall allow easy insertion
                    of probes up to 3.8 cm (1-1/2 inches) in
                    width in order to measure gaps in the primary
                    seal.

     308  RESILIENT-TOROID-SEAL CRITERIA - Any storage tank which
          uses a resilient-toroid-type seal shall meet the
          following conditions:

          308.1     No gap between the tank shell and the primary
                    seal shall exceed 1.3 cm (1/2 inch). The
                    cumulative length of all gaps exceeding 0.32
                    cm (1/8 inch) shall not be more than 5% of
                    the circumference.

          308.2     No gap between the tank shell and the
                    secondary seal shall exceed 1.3 cm (1/2
                    inch). The cumulative length of all gaps
                    exceeding 0.32 cm (1/8 inch) shall not be
                    more than 5% of the circumference.

          308.3     The secondary seal shall allow easy insertion
                    of probes up to 1.3 cm (1/2 inch) in width in
                    order to measure gaps in the primary seal.

          308.4     There shall be no holes or tears in, or
                    openings through the secondary seal or in the
                    primary seal envelope surrounding the annular
                    vapor space enclosed by the roof edge, stored
                    liquid surface, shoe, and seal fabric.

     309  WELDED TANKS WITH ZERO GAP SECONDARY SEALS - Any welded
          tank shell which uses a zero gap secondary seal must
          meet the following conditions:

          309.1     No gap between the tank shell and the primary
                    seal shall exceed 3.8 cm (1-1/2 inches). The
                    cumulative length of all primary seal gaps
                    exceeding 1.3 cm (1/2 inch) shall be not more
                    than 10% of the circumference and the
                    cumulative length of all primary seal gaps
                    exceeding 0.32 cm (1/8 inch) shall not be
                    more than 40% of the circumference. No
                    continuous gap greater than 0.32 cm (1/8
                    inch) shall exceed 10% of the circumference
                    of the tank.

          309.2     No gap between the tank shell and the
                    secondary seal shall exceed 1.5 mm (0.06
                    in.).  The cumulative length of all secondary
                    seal gaps exceeding 0.5 mm (0.02 inch) shall
                    not exceed 5% of the circumference of the
                    tank, excluding gaps less than 5 cm (1.79
                    in.) from vertical weld seams.

          309.3     The secondary seal must exert a positive
                    pressure against the tank shell such that the
                    seal surface in contact with the tank shell
                    does not pull away from the tank shell more
                    than the gaps allowed in Section 309.2.

400  ADMINISTRATIVE

     401  PRIMARY SEAL INSPECTION:

          401.1     The primary seal envelope shall be made
                    available for unobstructed inspection by the
                    Air Pollution Control Officer (APCO) on an
                    annual basis at four locations selected along
                    its circumference at random by the APCO.  If
                    the APCO detects one or more violations as a
                    result of any such inspection, the APCO may
                    require such further unobstructed inspection
                    of the primary seal as may be necessary to
                    determine the seal condition for its entire
                    circumference.  The APCO shall also have the
                    authority to require more inspection
                    locations if the inspector suspects the
                    possibility of a cumulative gap criteria
                    violation.

          401.2     In addition, for tanks with secondary seals
                    the primary seal envelope shall be made
                    available for inspection by the Air Pollution
                    Control Officer prior to the installation of
                    the secondary seal.  For tanks with secondary
                    seals installed before June 19, 1979, the
                    primary seal envelope shall be made available
                    for unobstructed inspection by the Air
                    Pollution Control Officer for its full length
                    every 5 years after June 19, 1979, except
                    that if the secondary seal is voluntarily
                    removed by the owner or operator prior
                    thereto, it shall be made available for such
                    inspection at that time.  The owner or
                    operator shall provide notification to the
                    Air Pollution Control Officer no less than 7
                    working days prior to voluntary removal of
                    the secondary seal.

500  MONITORING AND RECORDS:  

     501  RECORDKEEPING:

          501.1     A person whose tanks are subject to this Rule
                    shall keep an accurate record of liquids
                    stored in such containers and the vapor
                    pressure ranges of such liquids.

          501.2     Accurate records of throughput and stock
                    temperature shall also be maintained.

          501.3     Records shall include the number of organic
                    liquid storage tanks serviced and their
                    respective capacities in gallons.

          501.4     Records shall be retained for a period of at
                    least 2 years, and shall be retained at least
                    five years by sources subject to the
                    requirements of Rule 507, FEDERAL OPERATING
                    PERMIT PROGRAM, and made available to the Air
                    Pollution Control Officer on request.

          501.5     In addition to the recordkeeping requirements
                    specified herein, all provisions of
                    Regulation IV, Rule 410, when applicable,
                    shall be met.

     502  VAPOR PRESSURE DETERMINATION: The vapor pressure under
          actual storage conditions as determined by ASTM D-2879-83 
          or ASTM D-323-82.

     503  VAPOR RECOVERY SYSTEM TESTING:  The determination of
          the overall vapor recovery system efficiency reuired in
          Section 304 shall be made using the following test
          procedures, as applicable:

          503.1     California Air Resources Board Test Method
                    202, Vapor Recovery Systems at Gasoline Bulk
                    Plants.

          503.2     California Air Resources Board Test Method
                    203, Vapor Recovery Systems at Gasoline
                    Terminals.