(Adopted August 15, 1977)(Amended June 1, 1984)(Amended December 7,
1990)\
(Amended March 11, 1994)(Amended May 6, 2005)

**RULE 463. ORGANIC LIQUID STORAGE**

\(a\) Applicability

> This rule applies to any above-ground stationary tank with a capacity
> of 75,000 liters (19,815 gallons) or greater used for storage of
> organic liquids, and any above-ground tank with a capacity between 950
> liters (251 gallons) and 75,000 liters (19,815 gallons) used for
> storage of gasoline.

\(b\) Definitions

> For purposes of this rule, the following definitions apply:
>
> \(1\) ACTUAL STORAGE CONDITIONS means the temperature at which a
> product is stored in an above ground stationary tank.
>
> \(2\) Certified person is a person who has successfully completed the
> District tank self-inspection program, and who holds a certificate
> issued by the Executive Officer evidencing that such person is in good
> standing in this program.
>
> \(3\) EXEMPT COMPOUND is as defined in Rule 102.
>
> \(4\) GASOLINE means any petroleum distillate having a Reid vapor
> pressure of 200 mm Hg (3.9 pounds per square inch), or greater.
>
> \(5\) HEAVY CRUDE OIL means a crude oil with American Petroleum
> Institute (API) gravity 20 degrees or less.
>
> \(6\) ORGANIC LIQUID is any liquid containing VOCs.
>
> \(7\) PRESSURE RELIEF VALVE (PRV) is a valve which is automatically
> actuated by upstream static pressure, and used for safety or emergency
> purposes.
>
> \(8\) SEAL is a closure device between the tank wall and the floating
> roof edge that controls emissions of volatile organic compounds.
> Approved floating roof tank seals are categorized as follows:
>
> \(A\) Category \"A\" seals are seals approved by the Executive Officer
> as most effective in the control of volatile organic compounds and are
> deemed Best Available Control Technology (BACT) according to the
> criteria set forth in Attachment A - \"Floating Roof Tank Seal
> Categories.\"
>
> \(B\) Category \"B\" seals are seals approved by the Executive Officer
> that are considered more effective than Category \"C\" seals based on
> the criteria set forth in Attachment A - \"Floating Roof Tank Seal
> Categories.\"
>
> \(C\) Category \"C\" seals are seals approved by the Executive Officer
> which are currently in service but are considered least effective in
> the control of volatile organic compounds.
>
> \(9\) TANK is any stationary above-ground reservoir or any other
> stationary above-ground container used for storage of an organic
> liquid.
>
> \(10\) VAPOR TIGHT is a condition that exists when the reading on a
> portable hydrocarbon meter is less than 1,000 parts per million (ppm),
> expressed as methane, above background.
>
> \(11\) VOLATILE ORGANIC COMPOUND (VOC) is any volatile or gaseous
> chemical compound containing the element carbon, excluding methane,
> carbon monoxide, carbon dioxide, carbonic acid, metallic carbides, or
> carbonates, ammonium carbonate, and exempt compounds other than carbon
> tetrachloride.

\(c\) Tank Roof Requirements

> No person shall place, store or hold in any tank with a capacity of
> 150,000 liters (39,630 gallons) or greater, any organic liquid having
> a true vapor pressure of 25.8 mm Hg (0.5 psi) absolute or greater
> under actual storage conditions, and in any tank of more than 75,000
> liters (19,815 gallons) capacity, any organic liquid having a true
> vapor pressure of 77.5 mm Hg (1.5 psi) absolute or greater under
> actual storage conditions, unless such tank is a pressure tank
> maintaining working pressures sufficient at all times to prevent
> organic vapor loss to the atmosphere, or is designed and equipped with
> one of the following vapor control devices, or other vapor control
> device that has been determined to be equivalent after review by the
> staffs of the District, the Air Resources Board (ARB), and the United
> States Environmental Protection Agency (EPA), and approved in writing
> by the District Executive Officer, ARB, and EPA, which is properly
> installed and continuously maintained in good operating condition:
>
> \(1\) External Floating Roof
>
> An external floating roof shall consist of a pontoon-type or double
> deck-type cover that continuously rests on the surface of the organic
> liquid and is equipped with a closure device between the tank shell
> and roof edge. The closure device shall consist of two seals, with one
> seal placed above the other. The seal below shall be designated as the
> primary seal, and the seal above shall be designated as the secondary
> seal. A seal which is not identified on the current list of seals
> approved by the Executive Officer shall not be installed or used
> unless the Executive Officer determines that such seal meets the
> applicable criteria of subparagraphs (c)(1)(A) through (c)(1)(C).
>
> \(A\) A closure device on a welded or a riveted tank shell which uses
> a metallic shoe-type seal as its primary seal shall comply with the
> following requirements:
>
> \(i\) Gaps between the tank shell and the primary seal shall not
> exceed 1.3 centimeters (1/2 inch) for a cumulative length of 30
> percent of the circumference of the tank, and 0.32 centimeter (1/8
> inch) for 60 percent of the circumference of the tank. No gap between
> the tank shell and the primary seal shall exceed 3.8 centimeters
> (1-1/2 inches). No continuous gap between the tank shell and the
> primary seal greater than 0.32 centimeter (1/8 inch) shall exceed 10
> percent of the circumference of the tank.
>
> \(ii\) Gaps between the tank shell and the secondary seal shall not
> exceed 0.32 centimeter (1/8 inch) for a cumulative length of 95
> percent of the circumference of the tank. No gap between the tank
> shell and the secondary seal shall exceed 1.3 centimeters (1/2 inch).
>
> \(iii\) Metallic shoe-type seals installed on or after August 1, 1977
> shall be installed so that one end of the shoe extends into the stored
> organic liquid and the other end extends a minimum vertical distance
> of 61 centimeters (24 inches) above the stored organic liquid surface.
>
> \(iv\) 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 specified in clause (c)(1)(A)(i) for
> a length of at least 46 centimeters (18 inches) in the vertical plane
> above the liquid surface.
>
> \(B\) A closure device which uses a resilient toroid-type seal as its
> primary seal shall comply with the applicable requirements of
> subparagraph (c)(1)(A).
>
> \(C\) The primary and secondary seals shall comply with the following
> requirements:
>
> \(i\) The primary seal envelope shall be made available for
> unobstructed inspection by the Executive Officer along its
> circumference. In the case of riveted tanks with resilient toroid-type
> seals, at least eight such locations shall be made available; for all
> other types of seals, at least four such locations shall be made
> available. If the Executive Officer deems it necessary, further
> unobstructed inspection of the primary seal may be required to
> determine the seal\'s condition along its entire circumference.
>
> \(ii\) The secondary seal shall be installed in a way that permits the
> Executive Officer to insert probes up to 3.8 centimeters (1-1/2
> inches) in width to measure gaps in the primary seal.
>
> \(iii\) The secondary seal shall extend from the roof to the tank
> shell and shall not be attached to the primary seal.
>
> \(iv\) Notwithstanding the secondary and the primary seal requirements
> of paragraph (c)(1), a secondary or primary seal may be loosened or
> removed for preventive maintenance, inspection or repair for a period
> not exceeding 72 hours with prior notification to the Executive
> Officer .
>
> \(D\) All openings in the roof except pressure-vacuum valves, shall
> provide a projection below the liquid surface to prevent belching,
> escape, or entrainment of organic liquid, 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 visible gaps, except when the device or
> appurtenance is in use. Pressure vacuum valves shall be set to within
> 10 percent of the maximum allowable working pressure of the roof.
>
> \(E\) There shall be no holes, tears or openings in the secondary seal
> or in the primary seal envelope surrounding the annular vapor space
> enclosed by the roof edge, seal fabric, and secondary seal.
>
> \(F\) Any emergency roof drain shall be provided with a slotted
> membrane fabric cover, or equivalent device, that covers at least
> nine-tenths (9/10) of the area of the opening.
>
> \(2\) Internal Floating-Type Cover
>
> A fixed roof tank equipped with an internal floating-type cover shall
> comply with the following requirements:
>
> \(A\) A fixed roof tank with an existing internal floating-type cover
> approved by the Executive Officer on or before June 1, 1984, shall
> comply with the requirements applicable at the time such approval was
> given.
>
> \(B\) A fixed roof tank which has an internal floating-type cover
> installed, modified, or replaced after June 1, 1984, shall have a
> closure device which consists of either a single liquid mounted
> primary seal or a primary and a secondary seal. All openings and
> fittings shall be fully gasketed or controlled in a manner specified
> by the Executive Officer. The closure device shall control vapor loss
> with an effectiveness equivalent to a closure device which meets the
> requirements of subparagraph (c)(1)(A). Seal designs not identified on
> the current list of seals approved by the Executive Officer shall not
> be installed or used unless the Executive Officer has given his prior
> written approval to its installation or use. For purposes of this
> paragraph, modification includes an identical replacement.
>
> \(C\) The concentration of organic vapor in the vapor space above the
> internal floating-type cover shall not exceed 50 percent of its lower
> explosive limit (LEL) for those installed prior to June 1, 1984 and 30
> percent of its LEL for those installed after June 1, 1984. Compliance
> shall be verified by the use of an explosimeter.
>
> \(3\) Vapor Recovery System
>
> A fixed roof tank equipped with a vapor recovery system shall comply
> with the following requirements:
>
> \(A\) Any tank gauging or sampling device on a tank vented to the
> vapor recovery system shall be equipped with a vapor-tight cover which
> shall be closed at all times except during gauging or sampling. The
> roof of such tank shall be properly maintained to be vapor tight with
> no holes, tears or uncovered openings.
>
> \(B\) All piping, valves and fittings shall be constructed and
> maintained in a vapor-tight condition, in accordance with requirements
> of other District rules for such equipment.
>
> \(C\) For purposes of this paragraph, the efficiency of a vapor
> recovery system shall be determined by making a comparison of
> controlled emissions to those emissions which would occur from a fixed
> cone roof tank holding the same organic liquid without a vapor control
> or vapor recovery system. The vapor recovery system shall have an
> efficiency of at least 95 percent by weight.

\(d\) Other Performance Requirements

> \(1\) A person shall not place, store or hold gasoline in any tank,
> with a capacity of between 950 liters (251 gallons) and 75,000 liters
> (19,815 gallons) unless such tank is equipped with a pressure-vacuum
> valve which is set to within 10 percent of the maximum allowable
> working pressure of the container, or is equipped with a vapor loss
> control device which complies with the requirements set forth in
> subdivision (c).
>
> \(2\) The roof of any internal or external floating roof tank shall
> float on the organic liquid at all times (i.e., free of the roof leg
> supports) except when the tank is being completely emptied for
> cleaning, or repair. The process of emptying or refilling, when the
> roof is resting on leg supports, shall be continuous.
>
> \(3\) If a tank has been gas-freed and is to be refilled with
> gasoline, the roof shall be refloated with water or by an equivalent
> procedure approved by the Executive Officer. Paragraphs (d)(2) and
> (d)(3) shall be inapplicable to gasoline storage tanks at bulk
> gasoline distribution terminals which do not have:
>
> \(A\) existing facilities for treatment of waste water used to refloat
> the tank roof; or
>
> \(B\) facilities for equivalent emission control when refloating the
> roof with organic liquid.
>
> \(4\) A fixed roof tank with an internal floating-type cover or a tank
> with an external floating roof cover shall not be used for storing
> organic liquids having a true vapor pressure of 11 psia (569 mm Hg) or
> greater under actual storage conditions.
>
> \(5\) Replacement of a seal on a floating roof tank shall be allowed
> only if the replacement seal is chosen from the current list of seals
> approved by the Executive Officer. Category \"A\" seals shall be
> replaced only by Category \"A\" seals. Category \"B\" seals shall be
> replaced only by Category \"A\" or Category \"B\" seals. Category
> \"C\" seals shall be replaced only by Category \"A\" or Category \"B\"
> seals.
>
> \(6\) Organic liquids listed on the addendum to this rule shall be
> deemed to be in compliance with the appropriate vapor pressure limits
> for the tank in which it is stored provided the actual storage
> temperature does not exceed the corresponding maximum temperature
> listed.

\(e\) Self-Inspection of Floating Roof Tanks

> Any owner or operator of a floating roof tank(s) shall conduct
> self-inspections of its tank(s) according to the following procedures:
>
> \(1\) Inspection and Maintenance Plan
>
> \(A\) On or before September 14, 1994, each owner or operator shall
> submit an Inspection and Maintenance Plan to the Executive Officer for
> his/her approval. After September 14, 1994, each owner or operator
> constructing tank(s) subject to this rule shall submit an Inspection
> and Maintenance Plan, or a revision of its current Inspection and
> Maintenance Plan, to the Executive Officer prior to the completion of
> construction. The Inspection and Maintenance Plan shall include an
> inventory of tanks subject to this rule, the proposed self-inspection
> schedule, the number of certified persons to be dedicated to the
> program, any self-inspection procedures proposed in addition to those
> required by the District, and a copy of the owner or operator\'s
> safety procedures used for floating roof tanks. The tank inventory
> shall include tank identification number, maximum design capacity,
> product, shell type, dimensions, seal type and manufacturer, floating
> roof type, date of construction and location.
>
> \(2\) Identification Requirements
>
> \(A\) All tanks subject to this rule shall be clearly and visibly
> identified by a sign on the outside wall for inventory, inspection and
> recordkeeping purposes.
>
> \(B\) Any change(s) in tank identification shall require prior written
> approval by the Executive Officer.
>
> \(3\) Owner or Operator Inspection Requirements
>
> \(A\) All tanks subject to this rule shall be inspected by a certified
> person twice per year at 4 to 8 months intervals according to the
> procedures and guidelines set forth in Attachment B - \"Inspection
> Procedures and Compliance Report Form.\"
>
> \(B\) The primary and secondary seals shall be inspected by a
> certified person each time a tank is emptied and degassed. Gap
> measurements shall be performed on an external floating roof tank when
> the liquid surface is still but not more than 24 hours after the tank
> roof is refloated.
>
> \(C\) The Executive Officer shall be notified in writing at least 2
> weeks prior to the start of any tank-emptying or roof-refloating
> operation for planned maintenance of a tank.
>
> \(4\) Maintenance Requirements
>
> Any tank which does not comply with any provision of this rule shall
> be brought into compliance within 72 hours of the determination of
> non-compliance.
>
> \(5\) Reporting and Recordkeeping Requirements
>
> \(A\) All inspections shall be recorded on compliance inspection
> report forms approved by the Executive Officer as described in
> Attachment B - \"Inspection Procedures and Compliance Report Form.\"
>
> \(B\) All compliance inspection reports and documents shall be
> submitted to the Executive Officer within 5 working days of completion
> of the self-inspection.
>
> \(C\) If a tank is determined to be in violation of the requirements
> of this rule, a written report shall be submitted to the Executive
> Officer within 120 hours of the determination of non-compliance,
> indicating corrective actions taken to achieve compliance.
>
> \(D\) All records of owner or operator inspection and repair shall be
> maintained at the facility for a period of 3 years and shall be made
> available to the Executive Officer upon request.
>
> \(E\) Emissions Reporting
>
> \(i\) An owner or operator shall provide emissions information, to the
> Executive Officer upon request, based on the parameters listed in
> Attachment C using AQMD's Annual Emissions Reporting Program or U.S.
> EPA's most recent version of TANKS 4.0 Program. The requirement shall
> apply to all organic liquid storage tanks without regard to exemptions
> specified in subdivision (f).
>
> \(ii\) An owner or operator shall provide all upset emissions
> information associated with product change, repair, and turnover or
> any other excess emission incidents.
>
> \(iii\) An owner or operator shall maintain records of emissions data
> for all organic liquid storage tanks for the most recent two (2) year
> period.
>
> \(F\) A person whose tanks are subject to this rule shall keep an
> accurate record of liquids stored in such containers, the vapor
> pressure ranges, the API gravity, the temperature, and the initial
> boiling points referenced.

\(f\) Exemptions

> The provisions of this rule shall not apply to the following tanks,
> provided the person seeking the exemption supplies proof of the
> applicable criteria sufficient to satisfy the Executive Officer:
>
> \(1\) Oil production tanks with a capacity of between 75,000 liters
> (19,815 gallons) and 159,000 liters (42,008 gallons) which have a
> properly maintained vapor-tight roof and are equipped with a
> pressure-vacuum valve which is set within 10 percent of the maximum
> allowable working pressure of the tank, are exempt from the control
> requirements of this rule when:
>
> \(A\) The organic liquid contents fail to comply with subdivision (c)
> only when heated for shipment, and such heating occurs for not more
> than 48 hours and not more than once in any 20-day period; or
>
> \(B\) The tank has a monthly average throughput of not more than 30
> barrels of oil per day and was constructed prior to June 1, 1984.
>
> \(2\) Tanks being brought into compliance within the time period
> specified in paragraph (e)(4).

\(g\) Test Methods

> The following test methods and procedures shall be used to determine
> compliance with this rule. Other test methods determined to be
> equivalent after review by the staffs of the District, the Air
> Resources Board, and the United States Environmental Protection
> Agency, and approved in writing by the District Executive Officer may
> also be used.
>
> \(1\) Efficiency of a vapor recovery system specified in subparagraph
> (c)(3)(C) shall be determined according to SCAQMD Method 501.1 for the
> determination of total organic compound emissions. EPA Reference
> Methods 25 or 25A may be used, as applicable, in place of SCAQMD
> Method 25.1 specified in Method 501.1. An efficiency determined to be
> less than established by this rule through the use of any of the
> above-referenced test methods shall constitute a violation of the
> rule. Baseline emissions shall be calculated by using the criteria
> outlined in American Petroleum Institute Bulletin 2518.
>
> \(2\) Exempt compounds shall be determined according to SCAQMD Method
> 303. For the purpose of testing the efficiency of a vapor recovery
> system, exempt compounds shall be determined according to EPA
> Reference Method 18 or ARB Method 422. Any test method(s) for exempt
> compounds which cannot be identified through these referenced test
> methods shall be specified by the owner or operator seeking an
> exemption and shall be subject to approval in accordance with the
> procedures set forth above in this subdivision.
>
> \(3\) The Reid vapor pressure specified in paragraph (b)(4) and the
> Reid vapor pressure used in determining the true vapor pressure limit
> specified in paragraph (d)(4) shall be determined according to ASTM
> D-323-82 or California Code of Regulations, Title 13, Section 2297.
>
> \(4\) Vapor tight condition specified in subparagraphs (c)(3)(A) and
> (c)(3)(B) shall be determined according to EPA\'s Reference Method 21
> subject to the following limitations:
>
> \(A\) vapor tight condition shall be determined at a distance of 1 cm.
> or less from the source; an
>
> \(B\) the soap bubble test shall not be used in lieu of quantitative
> test methods for vapor tightness determination.
>
> \(5\) True vapor pressure of crude oils and distillates shall be
> determined, at actual storage conditions, by converting Reid Vapor
> Pressure using the appropriate API nomograph found in EPA AP-42 or API
> nomograph found in API Publication 2517, Second Edition, February
> 1980. The true vapor pressure of crude oils with an API gravity of 260
> or less, may be measured using the Lawrence Berkeley National
> Laboratory "Test Method for Vapor Pressure of Reactive Organic
> Compounds in Heavy Crude Oil Using Gas Chromatography".
>
> \(6\) API gravity is determined using the following:
>
> \(A\) ASTM D-1298-99e2 Standard Test Method for Density, Relative
> Density (Specific Gravity), or API Gravity of Crude Petroleum Products
> by Hydrometer Method; or
>
> \(B\) ASTM D-6822-02 Standard Test Method for Density, Relative
> Density, and API Gravity of Crude Petroleum and Liquid Petroleum
> Products by Thermohydrometer Method; or
>
> \(C\) ASTM D-287-92(2000)e1 Standard Test Method for API Gravity of
> Crude Petroleum and Petroleum Products (Hydrometer Method).

SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

**RULE 463 - ADDENDUM**

Storage Temperatures Versus Actual Vapor Pressure

(Gravity/Initial Boiling Points Referenced)

Reference

Property Temperature, oF

A - oAPI Not to Exceed Vapor

B - IBP, oF            Pressure

[                              ]{.underline}

[Organic Liquids]{.underline} [ A ]{.underline} [ B ]{.underline} [0.5
psia]{.underline} [1.5 psia]{.underline}

Crude Oils 12 \-- \-- \--

13 \-- 120 180

14 \-- 85 145

16 \-- 60 107

18 \-- 55 93

20 \-- 52 84

22 \-- 49 77

24 \-- 45 73

26 \-- 42 70

28 \-- 40 67

30 \-- 38 64

Middle Distillates

Kerosene 42.5 350 195 250

Diesel 36.4 372 230 290

Gas Oil 26.2 390 249 310

Stove Oil 23 421 275 340

Jet Fuels

JP-1 43.1 330 165 230

JP-3 54.7 110 \-- 25

JP-4 51.5 150 20 68

JP-5 39.6 355 205 260

JP-7 44-50 360 205 260

Fuel Oil

No. 1 42.5 350 195 250

No. 2 36.4 372 230 290

No. 3 26.2 390 249 310

No. 4 23 421 275 340

No. 5 19.9 560 380 465

No. 6 16.2 625 450 \--

**RULE 463 - ADDENDUM (Cont.)**

Reference

Property Temperature, oF

A - oAPI Not to Exceed Vapor

B - IBP, oF            Pressure

[                              ]{.underline}

[Organic Liquids]{.underline} [ A ]{.underline} [ B ]{.underline} [0.5
psia]{.underline} [1.5 psia]{.underline}

Asphalts

60 - 100 pen. \-- \-- 490 550

120 - 150 pen. \-- \-- 450 500

200 - 300 pen. \-- \-- 360 420

Acetone 47.0 133 \-- 35

Acrylonitrile 41.8 173 30 60

Benzene 27.7 176 35 70

Carbon Disulfide 10.6 116 \-- 10

(lb/gal)

Carbon Tetrachloride 13.4 170 30 60

Chloroform 12.5 142 \-- 40

(lb/gal)

Cylohexane 49.7 177 35 70

1,2 Dichloroethane 10.5 180 35 77

(lb/gal)

Ethyl Acetate 23.6 171 35 70

Ethyl Alcohol 47.0 173 45 83

Isopropyl Alcohol 47.0 181 45 87

Methyl Alcohol 47.0 148 \-- 50

Methylene Chloride 11.1 104 \-- 70

(lb/gal)

Methylethyl Ketone 44.3 175 30 70

1,1,1-Trichloroethane 11.2 165 60 100

(lb/gal)

Trichloroethylene 12.3 188 50 91

(lb/gal)

Toluene 30.0 231 73 115

Vinyl Acetate 19.6 163 \-- 60

**Attachment A**

**[Floating Roof Tank Seal Categories]{.underline}**

**[Primary Seals]{.underline}**

  ----------------------- ----------------------- -----------------------
  [Category               [Category               [Category
  a]{.underline}          B]{.underline}          c]{.underline}

  1\. Liquid mounted      1\. Liquid mounted      1\. Liquid mounted
  multiple wipers with    single wiper with drip  single wiper
  drip curtain and weight curtain and weight      

  2\. Liquid mounted      2\. Liquid mounted      2\. Liquid mounted foam
  mechanical shoe         double foam wipers with log
                          vapor curtain           

                          3\. Vapor mounted       3\. Liquid mounted foam
                          primary wiper           log with vapor curtain

                          4\. Vapor mounted E     4\. Liquid mounted
                          wiper                   resilient toroid type
                                                  liquid filled log

                          5\. Vapor mounted       5\. Vapor mounted foam
                          double wipers           log/bag

                          6\. Vapor mounted       6\. Vapor mounted foam
                          double foam wipers      wiper

                          7\. Vapor mounted       
                          multiple wipers         
  ----------------------- ----------------------- -----------------------

**[Secondary Seals]{.underline}**

  ----------------------- ----------------------- -----------------------
  [Category               [Category               [Category
  A]{.underline}          B]{.underline}          C]{.underline}

  1\. Multiple wipers     1\. Single wiper        1\. Liquid mounted
                                                  wiper

                                                  2\. Foam log/bag

                                                  3\. Maloney
  ----------------------- ----------------------- -----------------------

Criteria used for categorization of floating roof tank seals:

> 1\. Emission control effectiveness design
>
> 2\. Ability to maintain contact with tank wall
>
> 3\. Longevity in service

**ATTACHMENT B**

**INSPECTION PROCEDURES AND COMPLIANCE REPORT FORM**

[Equipment Needed:]{.underline}

> Explosimeter (for internal floating roof tanks), liquid resistant
> measuring tape or device, tank probe (to measure gaps in tank seals -
> 1/8 inch, 1/2 inch, 1-1/2 inch), flashlight.

[Inspection Procedures]{.underline}:

1\. The findings of all tank self-inspections, whether completed or not,
shall be recorded on the Rule 463 Compliance Report form prescribed by
the Executive Officer and submitted to the District\'s Refinery Section
in accordance with the rule\'s requirements. If an inspection is stopped
before completion, indicate the reason for this action in the Comments
section of the compliance report form.

2\. During compliance inspection, the person(s) conducting the
inspection must have a copy of the Permit to Operate or Permit to
Construct pertinent to the tank being inspected. Any discrepancies
between the permit equipment description and the existing tank or the
permit conditions and the actual operating conditions of the tank as
verified during inspection must be recorded in the Comments section of
the compliance report form.

3\. Inspect the ground level periphery of each tank for possible leaks
in the tank shell. Complete the tank information section (D) on the
report.

4\. For external floating roof tanks:

> o From the platform, conduct an overall visual inspection of the roof
> and check for obvious permit or rule violations. Record the
> information as shown under section F of the compliance report form.
>
> o During visual inspection of the roof, check for unsealed roof legs,
> open hatches, open emergency roof drains or vacuum breakers and record
> the findings on the report accordingly. Indicate presence of any tears
> in the fabric of both seals.
>
> o After the visual inspection, conduct an inspection of the entire
> secondary seal using the 1/8\" and 1/2\" probes. Record the gap data
> in section F(4) of the report.
>
> o Conduct an inspection of the entire primary seal using the 1/8\",
> 1/2\", and 1 1/2\" probes. Inspect the primary seal by holding back
> the secondary seal. Record the gap data in section F(5) of the report.
>
> o Record all cumulative gaps between 1/8 inch and 1/2 inch; between
> 1/2 inch and 1-1/2 inch; and in excess of 1-1/2 inches, for both
> primary and secondary seals in section G of the report. Secondary seal
> gaps greater than 1/2 inch should be measured for length and width,
> and recorded in Comments under section (J) of the report.

5\. For internal floating roof tanks:

> o Using an explosimeter, measure the concentration of the vapor space
> above the internal floating roof in terms of lower explosive limit
> (LEL), and record the reading in section (E) of the report.
>
> o Conduct a visual inspection of the roof openings and the secondary
> seal, if applicable, and record findings on the report.

6\. Complete all necessary calculations and record all required data
accordingly on the report.

**SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT**

**RULE 463 COMPLIANCE REPORT**

*\*\*PLEASE COMPLETE FORM LEGIBLY IN BLACK INK\*\**

  ------------- ----------- -------- ----- ------- ------------ --------- ------ ------
  Tank No.                  SCAQMD                 Inspection             Time   
                            Permit                 Date                          
                            No.                                                  

  Is This a                 No       Yes           If yes, Date                  
  Follow-up                                        of Previous                   
  Inspection?                                      Inspection                    
  ------------- ----------- -------- ----- ------- ------------ --------- ------ ------

  -------- ---------------- ------------------------------ ------- -------- ----- -----
  **A.**   **COMPANY                                                              
           INFORMATION:**                                                         

           Company Name                                                           

           Location Address                                City             Zip   

           Mailing Address                                 City             Zip   

           Contact Person                                  Title                  

           Phone                                                                  
  -------- ---------------- ------------------------------ ------- -------- ----- -----

  -------- -------------- ----------------------------- ------- ---------- ----- -------
  **B.**   **INSPECTION                                                          
           CONDUCTED                                                             
           BY:**                                                                 

           Name                                         Title                    

           Company Name                                 Phone                    

           Mailing                                      City               Zip   
           Address                                                               
  -------- -------------- ----------------------------- ------- ---------- ----- -------

  -------- ---------------- -- --------- -- --------- -- -------- -------------- ---------- -------- --------- -------- -- -- ------- ----------------- ---------- ------------ -- -- -- --- -- ------ -------- ------ -- --- ------ --
  **C.**   **TANK                                                                                                                                                                                                                    
           INFORMATION:**                                                                                                                                                                                                            

           Capacity                                      (bbls)   Installation                                                                          Tank                                    (ft)   Tank                   (ft)   
                                                                  Date                                                                                  Diameter                                       Height                        

           Product Type                                                                              Product                                                                                                                         
                                                                                                     RVP                                                                                                                             

           Type of Tank:                    Riveted                                                            Welded         Other                                (describe)                                                        

           Color of Shell                                                                                                             Color of Roof                                                                                  

           Roof Type:          Pontoon                                                      Double                                    Other(describe)                                                                                
                                                                                            Deck                                                                                                                                     

           External                                                              Internal                                                                                                                                            
           floating roof                                                         floating                                                                                                                                            
                                                                                 roof                                                                                                                                                
  -------- ---------------- -- --------- -- --------- -- -------- -------------- ---------- -------- --------- -------- -- -- ------- ----------------- ---------- ------------ -- -- -- --- -- ------ -------- ------ -- --- ------ --

  -------- --------------- --------------- --------- --- ----- ----- ----- --------- --------- ----- --- --------------
  **D.**   **GROUND LEVEL                                                                                
           INSPECTION:**                                                                                 

           1\)             Product                   F         2\)         Product                       (ft)
                           Temperature                                     level                         

           3\)             List type and                                                                 
                           location of                                                                   
                           leaks found in                                                                
                           tank shell.                                                                   

                                                                                                         

           4\)             List any                                                                      
                           discrepancies                                                                 
                           between the                                                                   
                           existing                                                                      
                           equipment and                                                                 
                           the equipment                                                                 
                           description on                                                                
                           the Permit.                                                                   

                                                                                                         

           5\)             Is tank in                    No          Yes             If no,              
                           compliance with                                           explain             
                           Permit                                                                        
                           conditions?                                                                   

                                                                                                         

                                                                                                         
  -------- --------------- --------------- --------- --- ----- ----- ----- --------- --------- ----- --- --------------

  -------- ------------ ---------------- ------ -------- ---------- -------- ---------------
  **E.**   **INTERNAL                                                        
           FLOATING                                                          
           ROOF TANK:**                                                      

           1\)          Check vapor                                          \% LEL
                        space between                                        
                        floating roof                                        
                        and fixed roof                                       
                        with                                                 
                        expiosimeter.                                        

           2\)          Conduct visual                                       
                        inspection of                                        
                        roofs and                                            
                        secondary seals,                                     
                        if applicable.                                       

           3\)          Are all roof     No     Yes      If no,              
                        openings                         explain in          
                        covered?                         Comments            
                                                         section             
                                                         (J) and             
                                                         proceed to          
                                                         part                
                                                         (H)(6).             
  -------- ------------ ---------------- ------ -------- ---------- -------- ---------------

  ---------- ---------------- ---------------- ------ ------- -- ------ ------------ -------- ------- -- ---- -- -------- -------- ------- ----- -- ----------- ------ ------------ ------ ------------------
  **F.**     **EXTERNAL                                                                                                   **Page 2                                                         
             FLOATING ROOF                                                                                                of 4**                                                           
             TANK:**                                                                                                                                                                       

  1\)        On the diagram                                                                                                                                                                
             (below) indicate                                                                                                                                                              
             the location of                                                                                                                                                               
             the ladder, roof                                                                                                                                                              
             drain(s),                                                                                                                                                                     
             anti-rotation                                                                                                                                                                 
             device(s),                                                                                                                                                                    
             platform, gauge                                                                                                                                                               
             well, and vents                                                                                                                                                               
             or other                                                                                                                                                                      
             appurtenances.                                                                                                                                                                
             *Note                                                                                                                                                                         
             information in                                                                                                                                                                
             relation to                                                                                                                                                                   
             North (to the                                                                                                                                                                 
             top of the                                                                                                                                                                    
             worksheet)*.                                                                                                                                                                  

  2\)        Describe any                                                                                                                                                                  
             uncovered                                                                                                                                                                     
             openings found                                                                                                                                                                
             on the roof in                                                                                                                                                                
             the Comments                                                                                                                                                                  
             section (J).                                                                                                                                                                  
             (Refer to Rule                                                                                                                                                                
             463(a)(1)(F)):                                                                                                                                                                

  3\)        Identify any                                                                                                                                                                  
             tears in the                                                                                                                                                                  
             seal fabric.                                                                                                                                                                  
             Describe and                                                                                                                                                                  
             indicate on                                                                                                                                                                   
             diagram (below):                                                                                                                                                              

                                                                                                                                                                                           

                                                                                                                                                                                           

                                                                                                                                                                                           

  4\)        Secondary Seal                                                                                                                                                                
             Inspection                                                                                                                                                                    

             a\)              Type of                                                                                                                                                      
                              Secondary Seal:                                                                                                                                              

             b\)              Does 1/2" probe                    No                                              Yes                                if yes,                                
                              drop past seal?                                                                                                       measure                                
                                                                                                                                                    length(s)                              
                                                                                                                                                    and show on                            
                                                                                                                                                    diagram                                

             c\)              Does 1/8" probe                    No                                              Yes                                if yes,                                
                              drop past seal?                                                                                                       measure                                
                                                                                                                                                    length(s)                              
                                                                                                                                                    and show on                            
                                                                                                                                                    diagram.                               

             d\)              Record                             \>                                              \>1/2"                                                                    
                              dimensions of                      1/8"                                                                                                                      
                              gap for gaps                                                                                                                                                 

             *NOTE: Record                                                                                                                                                                 
             the actual width                                                                                                                                                              
             and cumulative                                                                                                                                                                
             length of gaps                                                                                                                                                                
             in feet and                                                                                                                                                                   
             inches.*                                                                                                                                                                      

                              *(Do not include                                                                                                                                             
                              gaps \> 1/2" in                                                                                                                                              
                              1/8"                                                                                                                                                         
                              measurements)*                                                                                                                                               

  5\)        Primary Seal                                                                                                                                                                  
             Inspection                                                                                                                                                                    

             a\)              Type of Primary         Shoe;                                   Tube;                                Other                                                   
                              Seal:                                                                                                                                                        

             b\)              (shoe seal) does                                                           No                                Yes ;                       if yes,             
                              1-1/2" probe                                                                                                                             measure             
                              drop past seal?                                                                                                                          length(s)           
                                                                                                                                                                       and show on         
                                                                                                                                                                       diagram.            

             c\)              (shoe seal) does                                                           No ;                              Yes ;                       if yes,             
                              1/2" probe drop                                                                                                                          measure             
                              past seal?                                                                                                                               length(s)           
                                                                                                                                                                       and show on         
                                                                                                                                                                       diagram.            

             d\)              (tube seal) does                                                           No                                Yes                         if yes,             
                              1/2" probe drop                                                                                                                          measure             
                              past seal?                                                                                                                               (length(s)          
                                                                                                                                                                       and show on         
                                                                                                                                                                       diagram.            

             e\)              (all seal types)                                                           No                                Yes                         if yes,             
                              does 1/8" probe                                                                                                                          measure             
                              drop past seal?                                                                                                                          (length(s)          
                                                                                                                                                                       and show on         
                                                                                                                                                                       diagram.            

             f\)              Record                                                 \>1/8"                                                                     \>                         
                              dimensions of                                                                                                                     1/2"                       
                              gaps for gaps                                                                                                                                                

                              \>1-1/2"                                  *NOTE:                                                                                                             
                                                                        Record the                                                                                                         
                                                                        actual width                                                                                                       
                                                                        and                                                                                                                
                                                                        cumulative                                                                                                         
                                                                        length of                                                                                                          
                                                                        gaps in feet                                                                                                       
                                                                        and inches.*                                                                                                       

                              *(Do not include                                                                                                                                             
                              gaps \> 1/2" in                                                                                                                                              
                              1/8"                                                                                                                                                         
                              measurements, or                                                                                                                                             
                              gaps \> 1-1/2"                                                                                                                                               
                              in 1/2"                                                                                                                                                      
                              measurements)*                                                                                                                                               

  NOTE: Show                                                                                                                                                                               
  defects                                                                                                                                                                                  
  using                                                                                                                                                                                    
  symbols.                                                                                                                                                                                 
  Show seal                                                                                                                                                                                
  gaps and                                                                                                                                                                                 
  lengths.                                                                                                                                                                                 
  ---------- ---------------- ---------------- ------ ------- -- ------ ------------ -------- ------- -- ---- -- -------- -------- ------- ----- -- ----------- ------ ------------ ------ ------------------

**SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT**

**RULE 463 COMPLIANCE REPORT**

*\*\*PLEASE COMPLETE FORM LEGIBLY IN BLACK INK\*\**

  ------- ---------- ------------ --------- ------------------ -------------
  Tank               SCAQMD                                    Page 3 of 4
  No.                Permit No.                                

  ------- ---------- ------------ --------- ------------------ -------------

  ---------- ------------------ ------------- --------------------- -------- -- --------------- ---------
  **IF                                                                                          
  INTERNAL                                                                                      
  FLOATING                                                                                      
  ROOF TANK,                                                                                    
  PROCEED TO                                                                                    
  PART                                                                                          
  H(6).**                                                                                       

  **G.**     **CALCULATIONS -                                                                   
             complete all                                                                       
             applicable                                                                         
             portions of the                                                                    
             following:**                                                                       

                                Record                                                          
                                dimensions of                                                   
                                indicated                                                       
                                gaps \[from                                                     
                                F(4)(d),                                                        
                                F(5)(b), and                                                    
                                F(5)(f)\].                                                      
                                Record in                                                       
                                feet and                                                        
                                inches.                                                         

                                              Gaps in primary seal                              
                                              between 1/8 and 1/2                               
                                              inch:                                             

                                              Gaps in primary seal                              
                                              between 1/2 and 1-1/2                             
                                              inch:                                             

                                              Gaps in primary seal                              
                                              greater than 1-1/2                                
                                              inches:                                           

                                              Gaps in secondary                                 
                                              seal between 1/8 and                              
                                              1/2 inch:                                         

                                              Gaps in secondary                                 
                                              seal greater than 1/2                             
                                              inch:                                             

                                Multiply                                                        
                                diameter (ft)                                                   
                                of tank to                                                      
                                determine                                                       
                                appropriate                                                     
                                gap limits:                                                     

                                              5% circumference =                60% circ. =     
                                              diameter X 0.157 =                diam. X 1.88 =  

                                              10% circumference =               90% circ. =     
                                              diameter X 0.314 =                diam. X 2.83 =  

                                              30% circumference =               95% circ. =     
                                              diameter X 0.942 =                diam. X 2.98 =  
  ---------- ------------------ ------------- --------------------- -------- -- --------------- ---------

  -------- ------------- ----- ------------- ------------------------------------- ------ ------
  **H.**   **DETERMINE                                                                    
           COMPLIANCE                                                                     
           STATUS OF                                                                      
           TANK:**                                                                        

                         1\)   Were any                                            No     Yes
                               openings                                                   
                               found on the                                               
                               roof?                                                      

                         2\)   Were any                                            No     Yes
                               tears in the                                               
                               seals found:                                               

                         3\)   Is the                                              No     Yes
                               product level                                              
                               lower than                                                 
                               the level at                                               
                               which the                                                  
                               roof would be                                              
                               floating?                                                  

                         4\)   Secondary                                                  
                               Seal:                                                      

                                             Did 1/2" probe drop between shell and No     Yes
                                             seal?                                        

                                             Did cumulative 1/8" - 1/2" gap exceed No     Yes
                                             95% circumference length?                    

                         5\)   Primary Seal                                               

                               Shoe          Did 1-1/2" probe drop between shell   No     Yes
                                             and seal?                                    

                                             Did cumulative 1/2" - 1-1/2" gap             
                                             exceed 30% circumference length, and         

                                             Did cumulative 1/8 - 1/2" gap exceed  No     Yes
                                             60% circumference length?                    

                                             Did any [single                       No     Yes
                                             continuous]{.underline} 1/8" - 1-1/2"        
                                             gap exceed 10% circ. length?                 

                               Tube          Did 1/2" probe drop between shell and No     Yes
                                             seal                                         

                                             Did cumulative 1/8" - 1/2" gap exceed No     Yes
                                             95% circumference length?                    

                         6\)   Internal                                            No     Yes
                               floating roof                                              
                               (installed                                                 
                               before                                                     
                               6/1/84) did                                                
                               LEL exceed                                                 
                               50%                                                        

                                             (installed after 6/1/84) did LEL      No     Yes
                                             exceed 30%?                                  

                         7\)   Does tank                                           No     Yes
                               have permit                                                
                               conditions?                                                

                                             Does tank comply with these           No     Yes
                                             conditions?                                  
  -------- ------------- ----- ------------- ------------------------------------- ------ ------

  -------- -----------------------------------------------------------------
  **I.**   **IF INSPECTION WAS TERMINATED PRIOR TO COMPLETION FOR ANY
           REASON, PLEASE EXPLAIN:**

           

           
  -------- -----------------------------------------------------------------

  -------- ---------------------------------- -------------------------------
  **J.**   **COMMENTS:**                      Page 4 of 4

           Use this section to complete       
           answers to above listed items and  
           to describe repairs made to the    
           tank; include date and time        
           repairs were made.                 

                                              

                                              

                                              

                                              

                                              

                                              

                                              

                                              

                                              

                                              

                                              

                                              

                                              

                                              

                                              
  -------- ---------------------------------- -------------------------------

  -------- -----------------------------------------------------------------
  **K.**   ***I(We) certify the foregoing information to be correct and
           complete to the best of my(our) knowledge.***

  -------- -----------------------------------------------------------------

  ------------------- -------------------------- ---------------- ------- --------
  **Inspection                                                    Date:   
  completed by:**                                                         

                      (signature)                (Certification           
                                                 ID #)                    

  **Compliance status                                             Date:   
  by:**                                                                   

                      (signature)                (Certification           
                                                 ID #)                    

  **Company                                                       Date:   
  Representative:**                                                       

                      (signature)                (Certification           
                                                 ID #)                    
  ------------------- -------------------------- ---------------- ------- --------

SEND COMPLETED REPORT (Both Sheets) TO:

SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

> 21865 Copley Drive

FAX: (909) 396-3341\
Diamond Bar, CA 91765\
Attn: Rule 463 Program Supervisor

The data items shall include, but not be limited to, the following:

  ----------- ------------------------ ----------- ------------------- ----------- ------------------
  **A.**      **External Floating Roof **B.**      **Internal Floating **C.**      **Fixed Roof
              Tank**                               Roof Tank**                     Tank**

                                                                                   

  **1.**      **Tank I.D.**            **1.**      **Tank I.D.**       **1.**      **Tank I.D.**

  **2.**      **Product Code**         **2.**      **Product Code**    **2.**      **Product Code**

  **3.**      **Type of Floating Roof  **3.**      **Type of Floating  **3.**      **Vent Type to
              Seal**                               Roof Seal**                     Vapor Recovery
                                                                                   System**

  **4.**      **Shell Construction**   **4.**      **Shell             **\*4.**    **Average Stock
                                                   Construction**                  Storage
                                                                                   Temperature**

  **5.**      **Reid Vapor Pressure**  **5.**      **Reid Vapor        **5.**      **True Vapor
                                                   Pressure**                      Pressure**

  **\*6.**    **Average Stock Storage  **\*6.**    **Average Stock     **6.**      **Tank Diameter**
              Temperature**                        Storage                         
                                                   Temperature**                   

  **7.**      **True Vapor pressure**  **7.**      **True Vapor        **\*7.**    **Vapor Molecular
                                                   Pressure**                      Weight**

  **8.**      **Tank Diameter**        **8.**      **Tank Diameter**   **8.**      **Average Outage**

  **\*9.**    **Wind Speed Exponent**  **\*9.**    **Wind Speed        **\*9.**    **Average Daily
                                                   Exponent**                      Temperature
                                                                                   Change**

  **\*10.**   **Average Wind           **\*10.**   **Average Wind      **10.**     **Throughput**
              Velocity**                           Velocity**                      

  **\*11.**   **Seal Factor**          **\*11.**   **Seal Factor**     **11.**     **Turnover
                                                                                   Factor**

  **\*12.**   **Product Factor**       **\*12.**   **Product Factor**  **\*12.**   **Turnovers Per
                                                                                   Year**

  **\*13.**   **Vapor Molecular        **\*13.**   **Vapor Molecular   **\*13.**   **Adjustment
              Weight**                             Weight**                        Factor for Small
                                                                                   Tank**

  **\*14.**   **Clingage Factor**      **\*14.**   **Clingage Factor** **\*14.**   **Paint Factor**

  **15.**     **Throughput**           **15.**     **Throughput**      **\*15.**   **Crude-Oil Factor
                                                                                   (Breathing)**

  **\*16.**   **Density of Liquid      **\*16.**   **Density of Liquid **\*16.**   **Crude-Oil Factor
              Stock**                              Stock**                         (Working)**

  **17.**     **Total Number of        **\*17.**   **Number of         **17.**     **Breathing Loss**
              Different Type of                    Columns**                       
              Fitting**                                                            

  **18.**     **Total Roof Fitting     **\*18.**   **Effective Column  **18.**     **Working Loss**
              Loss Factor**                        Diameter**                      

  **19.**     **Vapor Pressure         **19.**     **Total Number of   **19.**     **Total Loss
              Function**                           Different Types of              (Without Vapor
                                                   Fittings**                      Recovery)**

  **20.**     **Roof Fitting Loss**    **\*20.**   **Total Deck        **\*20.**   **Vapor Recovery
                                                   Fitting Loss                    System
                                                   Factor**                        Efficiency**

  **21.**     **Standing Loss**        **21.**     **Vapor Pressure    **21.**     **Total Loss (With
                                                   Function**                      Vapor Recovery)**

  **22.**     **Withdrawal Loss**      **\*22.**   **Deck Seam Length  **22.**     **Number of Excess
                                                   Factor**                        Upset Emissions
                                                                                   Incidents**

  **23.**     **Total Loss**           **\*23.**   **Deck Seam Loss    **23.**     **Total Excess
                                                   per Unit**                      Upset Emissions**

  **24**      **Number of Excess Upset **24.**     **Deck Seam Loss**              
              Emissions Incidents**                                                

  **25.**     **Total excess Upset     **25.**     **Deck Fitting                  
              Emissions**                          Loss**                          

                                       **26.**     **Standing Loss**               

                                       **27.**     **Withdrawal Loss**             

                                       **28.**     **Total Loss**                  

                                       **29.**     **Number of Excess              
                                                   Upset Emissions                 
                                                   Incidents**                     

                                       **30.**     **Total Excess                  
                                                   Upset Emissions**               
  ----------- ------------------------ ----------- ------------------- ----------- ------------------

**\* Default values are available from the District**

**The Data format and order shall be specified and approved by the
Executive Officer.**