SDAPCD RULE X-KA STDS.OF PERF.FOR STOR.VESSELS FOR PETROLEUM          
LAST REVISED 03/14/89

          
          SUBPART Ka - Standards of Performance for Storage Vessels for
                       Petroleum Liquids for Which Construction, 
                       Reconstruction, or Modification Commenced After 
                       May 18, 1978 (Delegation Effective 5/24/82
                       Rev. Effective 3/14/89)


               RULE 260.110a. APPLICABILITY AND EXEMPTIONS

               (a)  APPLICABILITY AND DESIGNATION OF AFFECTED FACILITY.
          Except as provided in Section(b) of this rule, the affected
          facility to which this subpart applies is each storage vessel for
          petroleum liquids which has a storage capacity greater than
          151,416 liters (40,000 gallons) and for which construction is
          commenced after May 18, 1978.

               (b)  EXEMPTIONS.   Each petroleum liquid storage vessel with
          a capacity of less than 1,589,873 liters (420,000 gallons) used
          for petroleum or condensate stored, processed, or treated prior
          to custody transfer is not an affected facility and, therefore,
          is exempt from the requirements of this subpart.


               RULE 260.111a. DEFINITIONS  (Rev. Effective 3/14/89)

               In addition to the terms and their definitions listed in the
          Act and Subpart A of this Regulation the following definitions
          apply in this subpart:

               (a)  "Storage Vessel" means each tank, reservoir, or
          container used for the storage of petroleum liquids, but does not
          include:

                    (1)  Pressure vessels which are designed to operate in
               excess of 204.9 kPa (15 psig) without emissions to the
               atmosphere except under emergency conditions.

                    (2)  Subsurface caverns or porous rock reservoirs, or

                    (3)  Underground tank if the total volume of petroleum
               liquids added to and taken from a tank annually does not
               exceed twice the volume of the tank.

               (b)  "Petroleum Liquids" means petroleum, condensate, and
          any finished or intermediate products manufactured in a petroleum
          refinery but does not mean Nos. 2 through 6 fuel oils as
          specified in ASTM-D-396-78, gas turbine fuel oils Nos. 2-GT
          through 4-GT as specified in ASTM-D-2880-78, or diesel fuel  oils
          Nos. 2-D and 4-D as specified in ASTM-D-975-78.

               (c)  "Petroleum Refinery" means each facility engaged in
          producing gasoline, kerosene, distillate fuel oils, residual fuel
          oils, lubricants, or other products through distillation of
          petroleum or through redistillation, cracking, extracting, or
          reforming of unfinished petroleum derivatives.

               (d)  "Petroleum" means the crude oil removed from the earth
          and the oils derived from tar sands, shale, and coal.

               (e)  "Condensate" means hydrocarbon liquid separated from
          natural gas which condenses due to changes in the temperature or
          pressure, or both, and remains liquid at standard conditions.

               (f)  "True Vapor Pressure" means the equilibrium partial
          pressure exerted by a petroleum liquid such as determined in
          accordance with methods described in American Petroleum Institute
          Bulletin 2517, Evaporation Loss from Floating Roof Tanks, 1962.

               (g)  "Reid Vapor Pressure" is the absolute vapor pressure of
          volatile crude oil and volatile non-viscous petroleum liquids,
          except liquified petroleum gases, as determined by ASTM-D-323-82.
          (Rev. Effective 3/14/89)

               (h)  "Liquid-Mounted Seal" means a foam or liquid-filled
          primary seal mounted in contact with the liquid between the tank
          wall and the floating roof continuously around the circumference
          of the tank.

               (i)  "Metallic Shoe Seal" includes but is not limited to a
          metal sheet held vertically against the tank wall by springs or
          weighted levers and is connected by braces to the floating roof.
          A flexible coated fabric (envelope) spans the annular space
          between the metal sheet and the floating roof.

               (j)  "Vapor-Mounted Seal" means a foam-filled primary seal
          mounted continuously around the circumference of the tank so
          there is an annular vapor space underneath the seal.  The annular
          vapor space is bounded by the bottom of the primary seal, the
          tank wall, the liquid surface, and the floating roof.

               (k)  "Custody Transfer" means the transfer of produced
          petroleum and/or condensate, after processing and/or treating in
          the producing operations, from storage tanks or automatic
          transfer facilities to pipelines or any other forms of
          transportation.


               RULE 260.112a. STANDARD FOR VOLATILE ORGANIC COMPOUNDS
                              (VOC)

                         (a)  The owner or operator of each storage vessel to which
          this subpart applies which contains a petroleum liquid which, as
          stored, has a true vapor pressure equal to or greater than 10.3
          kPa (1.5 psia) but not greater than 76.6 kPa (11.1 psia) shall
          equip the storage vessel with one of the following:

                    (1)  An external 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 a
               closure device between the tank wall and the roof edge.
               Except as provided in Subsection (a)(1)(ii)(D) of this rule,
               the closure device is to consist of two seals, one above the
               other.  The lower seal is referred to as the primary seal
               and the upper seal is referred to as the secondary seal.
               The roof is to be floating on the liquid at all times (i.e.,
               off the roof leg supports) except during initial fill and
               when the tank is completely emptied and subsequently
               refilled.  The process of emptying and refilling when the
               roof is resting on the leg supports shall be continuous and
               shall be accomplished as rapidly as possible.

                         (i)  The primary seal is to be either a metallic
                    shoe seal, a liquid-mounted seal, or a vapor-mounted
                    seal.  Each seal is to meet the following requirements:

                              (A)  The accumulated area of gaps between the
                         tank wall and the metallic shoe seal or the
                         liquid-mounted seal shall not exceed 212 cm2 per
                         meter of tank diameter (10.0 in2 per ft. of tank
                         diameter) and the width of any portion of any gap
                         shall not exceed 3.81 cm (1 1/2 in).

                              (B)  The accumulated area of gaps between the
                         tank wall and the vapor mounted seal shall not
                         exceed 21.2 cm2 per meter of tank diameter (1.0
                         in2 per ft. of tank diameter) and the width of any
                         portion of any gap shall not exceed 1.27 cm (1/2
                         in).

                              (C)  One end of the metallic shoe is to
                         extend into the stored liquid and the other end is
                         to extend a minimum vertical distance of 61cm (24
                         in) above the stored liquid surface.

                              (D)  There are to be no holes, tears, or
                         other openings in the shoe, seal fabric, or seal
                         envelope.

                         (ii) The secondary seal is to meet the following
                    requirements:

                              (A)  The secondary seal is to be installed
                         above the primary seal so that it completely
                         covers  the space between the roof edge and the
                         tank wall except as provided in Subsection
                         (a)(1)(ii)(B) of this rule.

                              (B)  The accumulated area of gaps between the
                         tank wall and the secondary seal used in
                         combination with a metallic shoe or liquid-mounted
                         primary seal shall not exceed 21.2 cm2 per meter
                         of tank diameter (1.0 in2 per ft. of tank
                         diameter) and the width of any portion of any gap
                         shall not exceed 1.27 cm (1/2 in).  There shall be
                         no gaps between the tank wall and the secondary
                         seal used in combination with a vapor mounted
                         primary seal (that equal or exceed 1/8 inch).

                              (C)  There are to be no holes, tears or other
                         openings in the seal or seal fabric.

                              (D)  The owner or operator is exempted from
                         the requirements for secondary seals and the
                         secondary seal gap criteria when performing gap
                         measurements or inspections of the primary seal.

                         (iii)Each opening in the roof except for automatic
                    bleeder vents and rim space vents is to provide a
                    projection below the liquid surface.  Each opening in
                    the roof except for automatic bleeder vents, rim space
                    vents and leg sleeves is to be equipped with a cover,
                    seal or lid which is to be maintained in a closed
                    position at all times (i.e., no visible gap) except
                    when the device is in actual use or as described in
                    Subsection (a)(1)(iv) of this rule.  Automatic bleeder
                    vents are to be closed at all times when the roof is
                    floating, except when the roof is being floated off or
                    is being landed on the roof leg supports.  Rim vents
                    are to be set to open when the roof is being floated
                    off the roof legs support or at the manufacturer's
                    recommended setting.

                         (iv) Each emergency roof drain is to be provided
                    with a slotted membrane fabric cover that covers at
                    least 90 percent of the area of the opening.

                    (2)  A fixed roof with an internal floating type cover
               equipped with a continuous closure device between the tank
               wall and the cover edge.  The cover is to be floating at all
               times, (i.e., off the leg supports) except during initial
               fill and when the tank is completely emptied and
               subsequently refilled.  The process of emptying and
               refilling when the cover is resting on the leg supports
               shall be continuous and shall be accomplished as rapidly as
               possible.  Each opening in the cover except for automatic
               bleeder vents and the rim space vents is to provide a
               projection below  the liquid surface.  Each opening in the
               cover except for automatic bleeder vents, rim space vents,
               stub drains and leg sleeves is to be equipped with a cover,
               seal, or lid which is to be maintained in a closed position
               at all times (i.e., no visible gap) except when the device
               is in actual use.  Automatic bleeder vents are to be closed
               at all times when the cover is floating except when the
               cover is being floated off or is being landed on the leg
               supports.  Rim vents are to be set to open only when the
               cover is being floated off the leg supports or at the
               manufacturer's recommended setting.

                    (3)  A vapor recovery system which collects all VOC
               vapors and gases discharged from the storage vessel, and a
               vapor return or disposal system which is designed to process
               such VOC vapors and gases so as to reduce their emission to
               the atmosphere by at least 95 percent by weight.

                    (4)  A system equivalent to those described in
               Subsections (a)(1), (a)(2), or (a)(3) of this rule as
               provided in Rule 260.114a.

               (b)  The owner or operator of each storage vessel to which
          this subpart applies which contains a petroleum liquid which, as
          stored, has a true vapor pressure greater than 76.6 kPa (11.1
          psia), shall equip the storage vessel with a vapor recovery
          system which collects all VOC vapors and gases discharged from
          the storage vessel, and a vapor return or disposal system which
          is designed to process such VOC vapors and gases so as to reduce
          their emission to the atmosphere by at least 95 percent by
          weight.


               RULE 260.113a. TESTING AND PROCEDURES  (Rev. Effect.
          3/14/89)

               (a)  Except as provided in Rule 260.8(b) compliance with the
          standard prescribed in Rule 260.112a shall be determined as
          follows or in accordance with an equivalent procedure as provided
          in Rule 260.114a.

                    (1)  The owner or operator of each storage vessel to
               which this subpart applies which has an external floating
               roof shall meet the following requirements:

                         (i)  Determine the gap areas and maximum gap
                    widths between the primary seal and the tank wall and
                    between the secondary seal and the tank wall according
                    to the following frequency:  (Rev. Effective 3/14/89)

                              (A)  For primary seals, gap measurements
                         shall be performed within 60 days of the initial
                         fill  with petroleum liquid and at least once
                         every five years thereafter.  All primary seal
                         inspections or gap measurements which require the
                         removal or dislodging of the secondary seal shall
                         be accomplished as rapidly as possible and the
                         secondary seal shall be replaced as soon as
                         possible.

                              (B)  For secondary seals, gap measurements
                         shall be preformed within 60 days of the initial
                         fill with petroleum liquid and at least once every
                         year thereafter.

                              (C)  If any storage vessel is out of service
                         for a period of one-year or more, subsequent
                         refilling with petroleum liquid shall be
                         considered initial fill for the purposes of
                         Subsections (a)(1)(i)(A) and (a)(1)(i)(B) of this
                         rule.

                              (D)  Keep records of each gap measurement at
                         the plant for a period of at least 2 years
                         following the date of measurement.  Each record
                         shall identify the vessel on which the measurement
                         was performed and shall contain the date of the
                         seal gap measurement, the raw data obtained in the
                         measurement process required by Subsection
                         (a)(1)(ii) of this rule and the calculation
                         required by Subsection (a)(1)(iii) of this rule.

                              (E)  If either the seal gap calculated in
                         accord with Subsection (a)(1)(iii) of this rule or
                         the measured maximum seal gap exceeds the
                         limitations specified by Rule 260.112a of this
                         subpart, a report shall be furnished to the
                         Control Officer within 60 days of the date of
                         measurements.

                              The report shall identify the vessel and list
                         each reason why the vessel did not meet the
                         specifications of Rule 260.112a.  The report shall
                         also describe the actions necessary to bring the
                         storage vessel into compliance with the
                         specifications of Rule 260.112a.

                         (ii) Determine gap widths in the primary and
                    secondary seals individually by the following
                    procedures:

                              (A)  Measure seal gaps, if any, at one or
                         more floating roof levels when the roof is
                         floating off the roof leg supports.

                              (B)  Measure seal gaps around the entire
                         circumference of the tank in each place where a
                         1/8 in. diameter uniform probe passes freely
                         (without forcing or binding against seal) between
                         the seal and the tank wall and measure the
                         circumferential distance of each such location.

                              (C)  The total surface area of each gap
                         described in Subsection (a)(1) (ii)(B ) of this
                         rule shall be determined by using probes of
                         various widths to accurately measure the actual
                         distance from the tank wall to the seal and mul-
                         tiplying each such width by its respective
                         circumferential distance.

                         (iii)Add the gap surface area of each gap location
                    for the primary seal and the secondary seal
                    individually.  Divide the sum for each seal by the
                    nominal diameter of the tank and compare each ratio to
                    the appropriate ratio in the standard in Rule 260.112a
                    (a)(1)(i) and Rule 260.112a(a)(1)(ii).

                         (iv) Provide the Control Officer 30 days prior
                    notice of the gap measurement to afford the Control
                    Officer the opportunity to have an observer present.

                    (2)  The owner or operator of each storage vessel to
               which this subpart applies which has a vapor recovery and
               return or disposal system shall provide the following
               information to the Control Officer on or before the date on
               which construction of the storage vessel commences:

                         (i)  Emission data, if available, for a similar
                    vapor recovery and return or disposal system used on
                    the same type of storage vessel, which can be used to
                    determine the efficiency of the system.  A complete
                    description of the emission measurement method used
                    must be included.

                         (ii) The manufacturer's design specifications and
                    estimated emission reduction capability of the system.

                         (iii)The operation and maintenance plan for the
                    system.

                         (iv) Any other information which will be useful to
                    the Control Officer in evaluating the effectiveness of
                    the system in reducing VOC emissions.


               RULE 260.114a. ALTERNATIVE MEANS OF EMISSION LIMITATION
                                        (Effective 3/14/89)

               (a)  If, in the Administrator's judgment, an alternative
          means of emission limitation will achieve a reduction in
          emissions at least equivalent to the reduction in emissions
          achieved by any requirements in Rule 260.112a, the Administrator
          will publish in the Federal Register a notice  permitting the use
          of the alternative means for purposes of compliance with that
          requirement.

               (b)  Any notice under Section (a) of this rule will be
          published only after notice and an opportunity for a hearing.

               (c)  Any person seeking permission under this rule shall
          submit to the Administrator a written application including:

                    (1)  An actual emissions test that uses a full-sized or
               scale-model storage vessel that accurately collects and
               measures all VOC emissions from a given control device and
               that accurately simulates wind and accounts for other
               emission variables such as temperature and barometric
               pressure.

                    (2)  An engineering evaluation that the Administrator
               determines is an accurate method of determining equivalence.

               (d)  The Administrator may condition the permission on
          requirements that may be necessary to ensure operation and
          maintenance to achieve the same emissions reduction as specified
          in Rule 260.112a.


               RULE 260.115a. MONITORING OF OPERATIONS

               (a)  Except as provided in Section (d) of this rule, the
          owner or operator subject to this subpart shall maintain a record
          of the petroleum liquid stored, the period of storage, and the
          maximum true vapor pressure of that liquid during the respective
          storage period.

               (b)  Available data on the typical Reid vapor pressure and
          the maximum expected storage temperature of the stored product
          may be used to determine the maximum true vapor pressure from
          monographs contained in API Bulletin 2517, unless the Control
          Officer specifically requests that the liquid be sampled, the
          actual storage temperature determined, and the Reid vapor
          pressure determined from the sample(s).

               (c)  The true vapor pressure of each type of crude oil with
          a Reid vapor pressure less than 13.8 kPa (2.0 psia) or whose
          physical properties preclude determination by the recommended
          method is to be determined from available data and recorded if
          the estimated true vapor pressure is greater than 6.9 kPa (1.0
          psia).

               (d)  The following are exempt from the requirements of this
          section:

                    (1)  Each owner or operator of each storage vessel
               storing a petroleum liquid with a Reid vapor pressure of
               less than 6.9 kPa (1.0 psia) provided the maximum true vapor
               pressure does not exceed 6.9 kPa (1.0 psia).

                    (2)  Each owner or operator of each storage vessel
               equipped with a vapor recovery and return or disposal system
               in accordance with the requirements of Rules 260.112(a)(3)
               and 260.112a(b).