### SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

463 - 1 (Adopted August 15, 1977)(Amended June 1, 1984)(Ame nded December 7, 1990) (Amended March 11, 1994)(Amended May 6, 2005)

(Amended November 4, 2011)

RULE 463. ORGANIC LIQUID STORAGE

(a) Purpose and Applicability The purpose of this rule is to reduce emissions of volatile organic compounds (VOC) from the storage of organic liquids in statio nary above-ground tanks. This rule applies to any above-ground stationary tank wi th a capacity of 75,000 liters (19,815 gallons) or greater used for storage of org anic liquids, and any aboveground 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 definition s apply: (1) ACTUAL STORAGE CONDITIONS means the temperature at which a product is stored in an above ground stationary tan k. (2) AMBIENT TEMPERATURE is the temperature of an or ganic liquid within a storage tank that has been influenced by a tmospheric conditions only and is not elevated by a non-atmospheric means of heating at the tank which includes but is not limited to steam, hot wat er, heaters, heat exchangers, tank insulation, or tank jacketing. (3) CERTIFIED PERSON is an individual who has succe ssfully completed the District tank self-inspection program, and who holds a certificate issued by the Executive Officer evidencing that suc h individual is in good standing in this program. (4) DRAIN-DRY BREAKOUT TANK is an above-ground stor age tank designed such that the floating roof rests on suppo rt legs no higher than one foot along the tank shell with a bottom sloped to a sump or sumps such that no product or sludge remains on the tank bottom and walls after emptying except clingage and is primarily used to r eceive product from pipelines and to distribute product back into pipel ines. (5) EXEMPT COMPOUND is as defined in Rule 102. (6) GASOLINE means any petroleum distillate having a Reid vapor pressure of 200 mm Hg (3.9 pounds per square inch), or great er. (7) HEAVY CRUDE OIL means a crude oil with American Petroleum Institute (API) gravity 20 degrees or less.Rule 463 (Cont.) (Amended November 4, 2011)

463 - 2 (8) ORGANIC LIQUID is any liquid containing VOC. (9) PRESSURE RELIEF VALVE (PRV) is a valve which is automatically actuated by upstream static pressure, and used for safety or emergency

purposes. (10) SEAL is a closure device between the tank wall and the floating roof edge that controls emissions of VOCs. Approved floating roof tank seals are categorized as follows: (A) Category "A" seals are seals approved by the Ex ecutive Officer as
most effective in the control of VOCs and are deeme d Best Available Control Technology (BACT) according to th e criteria set forth in Attachment A - "Floating Roof Tank Seal Ca tegories." (B) Category "B" seals are seals approved by the E xecutive Officer that are considered more effective than Category "C " seals based
on the criteria set forth in Attachment A - "Floati ng Roof Tank Seal Categories." (C) Category "C" seals are seals approved by the Ex ecutive Officer which are currently in service but are considered l east effective in
the control of VOCs. (11) TANK is any stationary above-ground reservoir or any other stationary above-ground container used for storage of an organ ic liquid. (12) VAPOR TIGHT is a condition that exists when th e reading on a portable hydrocarbon meter is less than 500 parts per millio n (ppm), expressed as methane, above background. (13) VOLATILE ORGANIC COMPOUND (VOC) is as defined in Rule 102. (14) WORKING DAY is Monday through Friday and inclu des holidays that fall on any of the days Monday through Friday.

(c) Tank Roof Requirements No person shall place, store or hold in any tank wi th a capacity of 150,000 liters (39,630 gallons) or greater, any organic liquid hav ing a true vapor pressure of 25.8 mm Hg (0.5 psi) absolute or greater under actual st orage conditions, and in any tank of more than 75,000 liters (19,815 gallons) ca pacity, 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 pr essure tank maintaining working pressures sufficient at all times to prevent organi c vapor loss to the atmosphere, or is designed and equipped with one of the following vapor control devices, or otherRule 463 (Cont.) (Amended November 4, 2011)

463 - 3 vapor control device that has been determined to be equivalent after review by the staffs of the District, the Air Resources Board (AR B), and the United States Environmental Protection Agency (U.S. EPA), and app roved in writing by the District Executive Officer, ARB, and U.S. EPA, whic h is properly installed and continuously maintained in good operating condition : (1) External Floating Roof An external floating roof shall consist of a pontoo n-type or double decktype cover that continuously rests on the surface o f 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 t he primary seal, and the seal above shall be designated as the secondary sea l. 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 subparag raphs (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 c omply with the following requirements: (i) Gaps between the tank shell and the primary sea l 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 circumf erence of the tank. No gap between the tank shell and the pr imary seal shall exceed 3.8 centimeters (1-1/2 inches). No continuous gap between the tank shell and the prima ry seal greater than 0.32 centimeter (1/8 inch) shall excee d 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 cumulat ive length of 95 percent of the circumference of the ta nk. No gap between the tank shell and the secondary seal s hall exceed 1.3 centimeters (1/2 inch). (iii) Metallic shoe-type seals installed on or afte r August 1,
1977 shall be installed so that one end of the shoe extends into the stored organic liquid and the other end ex tends aRule 463 (Cont.) (Amended November 4, 2011)

463 - 4 minimum vertical distance of 61 centimeters (24 inc hes) above the stored organic liquid surface. (iv) The geometry of the shoe shall be such that th e maximum gap between the shoe and the tank shell is no great er than double the gap allowed by the seal gap criteria spe cified in clause (c)(1)(A)(i) for a length of at least 46 cen timeters (18 inches) in the vertical plane above the liquid surf ace. (B) A closure device which uses a resilient toroid- type seal as its primary seal shall comply with the applicable requi rements of subparagraph (c)(1)(A). (C) The primary and secondary seals shall comply wi th the following requirements: (i) The primary seal envelope shall be made availab le for unobstructed inspection by the Executive Officer al ong its
circumference. In the case of riveted tanks with r esilient toroid-type seals, at least eight such locations sh all be made available; for all other types of seals, at least f our such
locations shall be made available. If the Executiv e 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 ce ntimeters (1-1/2 inches) in width to measure gaps in the prim ary 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 pr imary seal may be loosened or removed for preventive maintenance, inspection or repair for a period not exceeding 72 hours with prior notification to the E xecutive
Officer. (D) All openings in the roof except pressure-vacuum valves, shall provide a projection below the liquid surface to pr event 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 beRule 463 (Cont.) (Amended November 4, 2011)

463 - 5 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 t he secondary seal or in the primary seal envelope surrounding the annula r vapor space enclosed by the roof edge, seal fabric, and seconda ry seal. (F) Any emergency roof drain shall be provided with a slotted membrane fabric cover, or equivalent device, that c overs 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 floatin g-type cover shall comply with the following requirements: (A) A fixed roof tank with an existing internal flo ating-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 floatin g-type cover installed, modified, or replaced after June 1, 1984 , shall have a closure device which consists of either a single li quid mounted primary seal or a primary and a secondary seal. Al l 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 approve d by the Executive
Officer shall not be installed or used unless the E xecutive Officer has given his prior written approval to its install ation or use. For purposes of this paragraph, modification includes a n identical replacement. (C) The concentration of organic vapor in the vapor space above the internal floating-type cover shall not exceed 50 pe rcent of its lower explosive limit (LEL) for those installed prior to June 1, 1984 and 30 percent of its LEL for those installed after Jun e 1, 1984. Compliance shall be verified by the use of an explo simeter.Rule 463 (Cont.) (Amended November 4, 2011)

463 - 6 (3) Vapor Recovery System A fixed roof tank equipped with a vapor recovery sy stem shall comply with the following requirements: (A) Any tank gauging or sampling device on a tank v ented to the vapor recovery system shall be equipped with a vapor-tigh t cover which shall be closed at all times except during gauging or sampling. The roof of such tank shall be properly maintained in a vapor tight condition with no holes, tears or uncovered opening s. (B) All piping, valves and fittings shall be constr ucted and maintained in a vapor-tight condition, in accordance with requ irements 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 o f 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 syste m shall have an efficiency of at least 95 percent by weight, or vent tank emissions to a fuel gas system.

(d) Other Performance Requirements (1) A person shall not place, store or hold gasolin e in any tank, with a capacity of between 950 liters (251 gallons) and 75,000 lite rs (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 r oof 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 refil led with gasoline, the roof shall be refloated with water or by an equivalent p rocedure approved by the Executive Officer. Paragraphs (d)(2) and (d)(3 ) shall be inapplicable to gasoline storage tanks at bulk gasoline distribu tion terminals which do
not have:Rule 463 (Cont.) (Amended November 4, 2011)

463 - 7 (A) existing facilities for treatment of waste wate r 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-typ e 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 s hall 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 rep laced only by Category "A" seals. Category "B" seals shall be replaced on ly by Category "A" or Category "B" seals. Category "C" seals shall be re placed 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 l imits for the tank in which it is stored provided the actual storage temp erature 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) sh all conduct self-inspections of its tank(s) according to the following procedures: (1) Inspection and Maintenance Plan (A) Each owner or operator shall maintain a current or revised Inspection and Maintenance Plan approved by the Exe cutive Officer. Each owner or operator constructing float ing roof tank(s) subject to this rule shall submit an Inspection and Maintenance Plan, or a revision of its current Inspection and M aintenance Plan, to the Executive Officer prior to the completion of construction. The Inspection and Maintenance Plan shall include a n inventory of floating roof tanks subject to this rule, the propo sed self-inspection schedule, the number of certified persons to be ded icated to the program, any self-inspection procedures proposed in addition to those required by the District, and a copy of the o wner or operator's safety procedures used for floating roof tanks. Th e tank inventory shall include tank identification number, maximum d esignRule 463 (Cont.) (Amended November 4, 2011)

463 - 8 capacity, product, shell type, dimensions, seal typ e and manufacturer, floating roof type, date of construct ion and location. (2) Identification Requirements (A) All floating roof tanks subject to this rule sh all be clearly and visibly identified by a sign on the outside wall fo r inventory, inspection and recordkeeping purposes. (B) Any change(s) in floating roof tank identificat ion shall require prior written approval by the Executive Officer. (3) Owner or Operator Inspection Requirements (A) All floating roof tanks subject to this rule sh all be inspected by a certified person twice per year at 4 to 8 months in tervals according to the procedures and guidelines set forth in Attac hment B - "Inspection Procedures and Compliance Report Form." (B) The primary and secondary seals shall be inspec ted by a certified person each time a floating roof tank is emptied an d 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 writ ing at least 2 weeks prior to the start of any tank-emptying or roof-ref loating operation for planned maintenance of a tank. (4) Maintenance Requirements Any floating roof tank which does not comply with a ny provision of this rule shall be brought into compliance within 72 hou rs of the determination of non-compliance.

(f) Reporting and Recordkeeping Requirements (1) The following shall apply to activities subject to the provisions of subdivision (e): (A) All inspections shall be recorded on compliance inspection report forms approved by the Executive Officer as describe d in Attachment B - "Inspection Procedures and Complianc e Report
Form." (B) All compliance inspection reports and documents shall be
submitted to the Executive Officer either electroni cally or by hard copy within 5 working days of completion of the sel f-inspection.Rule 463 (Cont.) (Amended November 4, 2011)

463 - 9 (C) If a tank is determined to be in violation of t he requirements of this rule, a written report shall be submitted to the Ex ecutive Officer within 120 hours of the determination of non-compli ance, indicating corrective actions taken to achieve comp liance. (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. (2) Emissions Reporting (A) An owner or operator shall provide emissions in formation, to the Executive Officer upon request, based on the parame ters listed in Attachment C using AQMD’s Annual Emissions Reportin g Program or U.S. EPA’s most recent version of TANKS 4.0 Program. The requirement shall apply to all organi c liquid storage tanks without regard to exemptions specified in sub division (g). (B) An owner or operator shall provide all upset em issions information associated with product change, repair, and turnove r or any other
excess emission incidents. (C) An owner or operator shall maintain records of emissions data for all organic liquid storage tanks for the most recen t two (2) year period. (3) A person whose tanks are subject to this rule s hall keep an accurate record of liquids stored in such containers, the vapor pre ssure ranges, the API gravity, the temperature, and the initial boiling p oints referenced.

(g) Exemptions (1) 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: (A) 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 equipp ed with a pressure-vacuum valve which is set within 10 percen t of the maximum allowable working pressure of the tank, are exempt from the control requirements of this rule when: (i) The organic liquid contents fail to comply with subdivision (c) only when heated for shipment, and such heating occursRule 463 (Cont.) (Amended November 4, 2011)

463 - 10 for not more than 48 hours and not more than once i n any 20-day period; or (ii) The tank has a monthly average throughput of n ot more than 30 barrels of oil per day and was constructed prior to June 1, 1984. (B) Tanks being brought into compliance within the time period specified in paragraph (e)(4). (2) The provisions of (d)(2) shall not apply to dra in-dry breakout tanks that are subject to the provisions of Rule 1149 - Storage Ta nk And Pipeline Cleaning And Degassing.

(h) Test Methods The following test methods and procedures shall be used to determine compliance
with this rule. Other test methods determined to b e equivalent after review by the staffs of the District, the Air Resources Board, an d the U.S. EPA, 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 pl ace of SCAQMD Method 25.1 specified in Method 501.1. An efficien cy determined to be less than established by this rule through the use of any of the abovereferenced test methods shall constitute a violatio n 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 E PA Reference Method 18 or ARB Method 422. Any test method(s) fo r 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)(6) and the Reid vapor pressure used in determining the true vapor pressur e limit specified in paragraph (d)(4) shall be determined according to A STM D-323-82Rule 463 (Cont.) (Amended November 4, 2011)

463 - 11 Vapor Pressure of Petroleum Products (Reid Method) or California Code of Regulations, Title 13, Section 2297, and convert ed to true vapor pressure using applicable nomographs in U.S. EPA AP -42, Fifth Edition, Volume 1, Chapter 7, or nomographs approved by the Executive Officer
and U.S. EPA. (4) Notwithstanding the provisions of paragraph (h) (3), if a permit condition or District rule requires a demonstration of true v apor pressure of less than 5 mm Hg (0.1 psi) absolute, either of the following test methods may be
used: (A) Organic liquids that are stored at ambient temp eratures with a true vapor pressure of greater than 5 mm Hg (0.1 psi) ab solute under actual storage conditions shall be determined as th ose with a flash point of less than 100 °F as determined by ASTM Met hod D-93 – 10a - Flash Point by Pensky-Martens Closed Cup Test er. (B) Organic liquids that are stored at above ambien t temperatures with a true vapor pressure greater than 5 mm Hg (0.1 psi ) absolute under actual storage conditions shall be determined as th ose whose volume percent evaporated is greater than ten perce nt at an adjusted temperature T Adj as determined by ASTM Method D-86 – 11a - Distillation of Petroleum Products at Atmosph eric Pressure
of:

T Adj = 300 °F + T 1 - T a

Where:
T 1 = Liquid Storage Temperature (°F)
T a = Ambient Temperature (°F) = 70 °F

(5) Notwithstanding the provisions of paragraph (h) (3), the true vapor pressure of crude oils and distillates shall be det ermined, at actual storage conditions, by converting Reid vapor pressure using the appropriate API nomograph found in U.S. EPA AP-42, Fifth Edition, V olume 1, Chapter 7, or API nomograph found in API Publication 2517, Sec ond Edition, February 1980. The true vapor pressure of crude oi ls with an API gravity of 26.0 or less, may be measured using the Lawrence Berkeley National Laboratory “Test Method for Vapor Pressure of React ive OrganicRule 463 (Cont.) (Amended November 4, 2011)

463 - 12 Compounds in Heavy Crude Oil Using Gas Chromatograp hy.”, May 28,
2002. (6) Vapor tight condition specified in subparagraph s (c)(3)(A) and (c)(3)(B) shall be determined according to U.S. EPA's Referen ce Method 21 using an appropriate analyzer calibrated with methane. (7) API gravity is determined using the following: (A) ASTM D-1298-99e2 Standard Test Method for Densi ty, 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 Liq uid 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 (Hydromet er Method).Rule 463 (Cont.) (Amended November 4, 2011)

463 - 13 SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

RULE 463 - ADDENDUM

Storage Temperatures Versus Actual Vapor Pressure (Gravity/Initial Boiling Points Referenced)

Reference Property Temperature, o F A - o API Not to Exceed Vapor B - IBP, o F Pressure
Organic Liquids A B 0.5 psia 1.5 psia

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 (Cont.) (Amended November 4, 2011)

463 - 14 RULE 463 - ADDENDUM (Cont.)

Reference Property Temperature, o F A - o API Not to Exceed Vapor B - IBP, o F Pressure
Organic Liquids A B 0.5 psia 1.5 psia

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 -- 60Rule 463 (Cont.) (Amended November 4, 2011)

463 - 15 

### ATTACHMENT A

FLOATING ROOF TANK SEAL CATEGORIES

PRIMARY SEALS

Category A Category B Category C

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

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

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

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

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

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

7. Vapor mounted multiple wipers

SECONDARY SEALS
Category A Category B Category C

1. Multiple wipers 1. Single wiper 1. Liquid mounted wiper 2. Foam log/bag 3. Maloney

Criteria used for categorization of floating roof t ank seals: 1. Emission control effectiveness design 2. Ability to maintain contact with tank wall 3. Longevity in serviceRule 463 (Cont.) (Amended November 4, 2011)

463 - 16 

### ATTACHMENT B

INSPECTION PROCEDURES AND COMPLIANCE REPORT FORM
Equipment Needed:
Explosimeter (for internal floating roof tanks), li quid 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:
1. The findings of all tank self-inspections, wheth er completed or not, shall be recorded on the Rule 463 Compliance Report form prescribed b y the Executive Officer and submitted to the District's Refinery Section in acc ordance with the rule's requirements. If an inspection is stopped before c ompletion, indicate the reason for this action in the Comments section of the complian ce report form.
2. During compliance inspection, the person(s) cond ucting the inspection must have a copy of the Permit to Operate or Permit to Construc t pertinent to the tank being inspected. Any discrepancies between the permit eq uipment description and the existing tank or the permit conditions and the actu al operating conditions of the tank as verified during inspection must be recorded in t he 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 re port.
4. For floating roof tanks containing organic liqui d not subject to the provisions of subdivision (c) of Rule 463, conduct only steps 1 t hrough 3 of this attachment. For all other floating roof tanks, conduct steps 5 through 7 as applicable.
5. For external floating roof tanks:
o From the platform, conduct an overall visual insp ection 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 u nsealed roof legs, open hatches, open emergency roof drains or vacuum break ers and record the findings on the report accordingly. Indicate prese nce of any tears in the fabric of both seals. o After the visual inspection, conduct an inspectio n of the entire secondary seal using the 1/8" and 1/2" probes. Record the gap dat a 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 b ack the secondary seal. Record the gap data in section F(5) of the report.Rule 463 (Cont.) (Amended November 4, 2011)

463 - 17 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 g aps greater than 1/2 inch should be measured for length and width, and record ed in Comments under section (J) of the report.
6. 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 explos ive 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.
7. Complete all necessary calculations and record a ll required data accordingly on the report.Rule 463 (Cont.) ATTACHMENT B (Cont.) (Amended November 4, 2011)

463-18 SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

RULE 463 COMPLIANCE REPORT

**PLEASE COMPLETE FORM LEGIBLY IN BLACK INK**

Tank No. SCAQMD Permit No. Inspection Date Time
Is This a Follow-up Inspection? No  Yes  If yes, Date of Previous 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 A ddress City Zip

C. TANK INFORMATION:
Capacity (bbls) Installation Date Tank Diameter (ft) Tank Height (ft)

Product Type Product RVP
Type of Tank: Riveted  Welded  Other  (describe)

Color of Shell Color of Roof
Roof Type: Pontoon  Double Deck  Other(describe)
External floating roof  Internal floating roof 

D. GROUND LEVEL INSPECTION:
1) Product Temperature ° F 2) Product level (ft)
3) List type and location of leaks found in tank s hell.

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

5) Is tank in compliance with Permit conditions? N o  Yes  If no, explain

E. INTERNAL FLOATING ROOF TANK:

1) Check vapo r space between floating roof and fixed roof with e xpiosimeter. % LEL
2) Conduct visual inspection of roofs and secondar y seals, if applicable.

3) Are all roof openings covered? No  Yes  If no, explain in Comments section (J) and proceed to part (H)(6).Rule 463 (Cont.) ATTACHMENT B (Cont.) (Amended November 4, 2011)

463-19 F. EXTERNAL FLOATING ROOF TANK: Page 2 of 4

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 Nort h (to the top of the worksheet)

. 2) Describe any uncovered openings found on the roo f in the Comments section (J).
3) Identify any tears in the seal fabric. Describe an d indicate on diagram (below):

4) Secondary Seal Inspection
a) Type of Secondary Seal:
b) Does 1/2” probe drop past seal? No  Yes  if yes, measure length(s) and show on diagram
c) Does 1/8” probe drop past seal? No  Yes  if yes, measure length(s) and show on diagram.

d) Record dimensions of gap for gaps > 1/8” > 1/2”
NOTE: Record the actual width and cumulative lengt h of gaps in feet and inches.
(Do not include gaps > 1/2” in 1/8” measurements)
5) Primary Seal Inspection

a) Type of Primary Seal:  Shoe;  Tube;  Other
b) (shoe seal) does 1-1/2” probe drop past seal? N o  Yes  ; if yes, measure length(s) and show on diagram.

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

e) (all seal types) does 1/8” probe drop past seal? No  Yes  if yes, measure (length(s) and show on diagram.
f) Record dimensions of gaps for gaps >1/8” > 1/2 ”

>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, o r gaps > 1-1/2” in 1/2” measurements)
NOTE: Show defects using symbols. Show seal gaps and lengths.

LEGEND: Equipment:  Antirotational device O Gauge well

┬ Leg stand ⊗ Roof drain * Emergency roof drain

∞ Vacuum breaker ▲ Vent Platform & ladder

Defects: Ө Leg top ╫ Leg pin ơ Open hatch \/\ Torn seal |-P-| Primary seal gap |-S-| Secondary seal gap NRule 463 (Cont.) ATTACHMENT B (Cont.) (Amended November 4, 2011)

463-20 SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

RULE 463 COMPLIANCE REPORT

**PLEASE COMPLETE FORM LEGIBLY IN BLACK INK**

Tank No. SCAQMD Permit No. Page 3 of 4

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 approp riate gap limits:

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

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

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

H. DETERMINE COMPLIANCE STATUS OF TANK:
1) Were any openings found on the roof? No  Yes 

2) Were any tears in the seals found: No  Yes 
3) Is the product level lower than the level at wh ich the roof would be floating? No  Yes 
4) Secondary Seal:
Did 1/2” probe drop between shell and seal? No  Yes 
Did cumulative 1/8” - 1/2” gap exceed 95% circum ference length? No  Yes 

5) Primary Seal
Shoe Did 1-1/2” probe drop between shell and seal ? No  Yes 

Did cumul ative 1/2”

- 1

- 1/2” gap exceed 30% circumference length, and
Did cumulative 1/8 - 1/2” gap exceed 60% circumf erence length? No  Yes 
Did any single continuous 1/8”

- 1

- 1/2” gap exceed 10% circ. length? No  Yes 
Tube Did 1/2” probe drop between shell and seal N o  Yes 
Did cumulative 1/8” - 1/2” gap exceed 95% circum ference length? No  Yes 

6) Internal floating roof (installed before 6/1/84) di d LEL exceed 50% No  Yes 
(installed after 6/1/84) did LEL exceed 30%? No  Yes 

7) Does tank have permit conditions? No  Yes 
Does tank comply with these conditions? No  Yes 

I. IF INSPECTION WAS TERMINATED PRIOR TO COMPLETION FOR ANY REASON, PLEASE EXPLAIN:Rule 463 (Cont.) ATTACHMENT B (Cont.) (Amended November 4, 2011)

463-21 J. COMMENTS: Page 4 of 4

Use this secti on to complete answers to above listed items and to describe repairs made to the tank; include date an d time repairs were mad e.

K. I(We) certify the foregoing information to be corr ect and complete to the best of my(our) knowledge.

Inspection completed by: Date: (signature) (Certification ID #)

Compliance status by: Date: (signature) (Certification ID #)

Company Representative: Date: (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

FOR SCAQMD USE ONLY: Date received

Reviewed by: Date reviewed (signature) (Certification ID #)

Tank Status: [ ] in compliance [ ] in violation, Rule(s)
Comments :Rule 463ATTACHMENT C (Amended November 4, 2011)DATA REPORTING REQUIREMENT FOR ROOF TANKS463-22The data items shall include, but not be limited to, the following:A. External Floating Roof TankB. Internal Floating Roof Tank C. Fixed Roof Tank1. Tank I.D.1. Tank I.D.1. Tank I.D.2. Product Code2. Product Code2. Product Code3. Type of Floating Roof Seal3. Type of Floating Roof Seal 3. Vent Type to VaporRecovery System4. Shell Construction4. Shell Construction *4. Average Stock Storage Temperature5. Reid Vapor Pressure5. Reid Vapor Pressure 5. True Vapor Pressure*6. Average Stock Storage Temperature *6. Average Stock Storage Temperature 6. Tank Diameter7. True Vapor pressure7. True Vapor Pressure *7. Vapor Molecular Weight8. Tank Diameter8. Tank Diameter8. Average Outage*9. Wind Speed Exponent*9. Wind Speed Exponent *9. Average Daily Temperature Change*10. Average Wind Velocity*10. Average Wind Velocity 10. Throughput*11. Seal Factor*11. Seal Factor11. Turnover Factor*12. Product Factor*12. Product Factor*12. Turnovers Per Year*13. Vapor Molecular Weight*13. Vapor Molecular Weight *13. Adjustment Factorfor Small Tank*14. Clingage Factor*14. Clingage Factor*14. Paint Factor15. Throughput15. Throughput*15. Crude-Oil Factor (Breathing)*16. Density of Liquid Stock*16. Density of Liquid Stock *16. Crude-Oil Factor(Working)17. Total Number of Different Type of Fitting *17.Number of Columns 17. Breathing Loss18. Total Roof Fitting Loss Factor*18. Effective Column Diameter 18. Working Loss19. Vapor Pressure Function19. Total Number of Different Types of Fittings 19.Total Loss (Without Vapor Recovery)20. Roof Fitting Loss*20. Total Deck Fitting Loss Factor *20. Vapor Recovery System Efficiency21. Standing Loss21. Vapor Pressure Function 21. Total Loss (With Vapor Recovery)22. Withdrawal Loss*22. Deck Seam Length Factor 22. Number of Excess Upset Emissions Incidents23. Total Loss*23. Deck Seam Loss per Unit 23. Total Excess UpsetEmissions24 Number of Excess Upset Emissions Incidents 24. Deck Seam Loss25. Total excess Upset Emissions25. Deck Fitting Loss26. Standing Loss27. Withdrawal Loss28. Total Loss29. Number of Excess Upset Emissions Incidents30. Total Excess Upset Emissions* Default values are available from the DistrictThe Data format and order shall be specified and approved by the Executive Officer.