Bay Area Air Quality Management District November 27, 2002

8-5-1

BAY AREA AIR QUALITY MANAGEMENT DISTRICT

REGULATION 8, RULE 5 - STORAGE OF ORGANIC LIQUIDS

(SECTIONS AMENDED OR DELETED 11/27/02)

INDEX

8-5-100 GENERAL

8-5-101 Description

8-5-110 Exemptions

8-5-111 Limited Exemption, Tank Removal From and Return to Service

8-5-112 Limited Exemption, Tanks in Operation

8-5-113 Deleted May 4, 1988

8-5-114 Deleted May 4, 1988

8-5-115 Deleted May 4, 1988

8-5-116 Exemption, Gasoline Storage Tanks at Gasoline Dispensing Facilities

8-5-117 Exemption, Low Vapor Pressure

8-5-200 DEFINITIONS

8-5-201 Abatement Efficiency

8-5-202 Storage Tank

8-5-203 Deleted November 27, 2002

8-5-204 Organic Liquid

8-5-205 Gasoline

8-5-206 Gas Tight

8-5-207 Approved Emission Control System

8-5-208 Degassing

8-5-209 External Floating Roof Tank

8-5-210 Internal Floating Roof Tank

8-5-211 True Vapor Pressure

8-5-212 Organic Compound

8-5-213 Viewport

8-5-214 Gauge Float

8-5-215 Guidepole

8-5-216 Zero Gap Pole Wiper Seal

8-5-217 Decommissioning

8-5-218 Stock Change

8-5-219 Tank Cleaning

8-5-220 Temporary Removal From Service

8-5-221 Liquid Balancing

8-5-300 STANDARDS

8-5-301 Storage Tank Control Requirements

8-5-302 Requirements for Submerged Fill Pipes

8-5-303 Requirements for Pressure Vacuum Valves

8-5-304 Requirements for External Floating Roofs

8-5-305 Requirements for Internal Floating Roofs

8-5-306 Requirements for Approved Emission Control Systems

8-5-307 Requirements for Pressure Tanks and Blanketed Tanks

8-5-310 Deleted May 4, 1988

8-5-311 Deleted November 27, 2002
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8-5-312 Deleted January 20, 1993

8-5-313 Deleted January 20, 1993

8-5-314 Deleted January 20, 1993

8-5-320 Tank Fitting Requirements

8-5-321 Primary Seal Requirements

8-5-322 Secondary Seal Requirements

8-5-323 Deleted January 20, 1993

8-5-324 Deleted January 20, 1993

8-5-325 Deleted January 20, 1993

8-5-326 Deleted May 4, 1988

8-5-327 Deleted May 4, 1988

8-5-328 Tank Degassing Requirements

8-5-329 Deleted November 27, 2002

8-5-330 Deleted November 27, 2002

8-5-400 ADMINISTRATIVE REQUIREMENTS

8-5-401 Inspection Requirements for External Floating Roof Tanks

8-5-402 Inspection Requirements for Internal Floating Roof Tanks

8-5-403 Inspection Requirements for Pressure Vacuum Valves

8-5-404 Certification

8-5-405 Information Required

8-5-410 Deleted May 4, 1988

8-5-500 MONITORING AND RECORDS

8-5-501 Records

8-5-502 Tank Degassing Annual Source Test Requirement

8-5-503 Portable Hydrocarbon Detector

8-5-600 MANUAL OF PROCEDURES

8-5-601 Analysis of Samples, Reid Vapor Pressure

8-5-602 Analysis of Samples, True Vapor Pressure

8-5-603 Determination of Emissions

8-5-604 Determination of Applicability

8-5-605 Pressure-Vacuum Valve Gas Tight Determination
Bay Area Air Quality Management District November 27, 2002

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REGULATION 8

ORGANIC COMPOUNDS

RULE 5

STORAGE OF ORGANIC LIQUIDS

(Adopted January 1, 1978)

8-5-100 GENERAL

8-5-101 Description: The purpose of this Rule is to limit emissions of organic compounds

from storage tanks.

Note: New storage tanks may also be subject to Regulation 10 and storage tanks

located at bulk plants may also be subject to the requirements of Regulation 8, Rule

6 or Rule 33.

(Amended 9/4/85; 5/4/88; 1/20/93)

8-5-110 Exemptions: This Rule does not apply to emissions from the following sources:

110.1 Storage tanks having a capacity of less than 1.0 m3 (264 gal).

110.2 Any storage tank installed prior to January 4, 1967, which is not used for

storage of gasoline to be dispensed to internal combustion engine fuel tanks,

and is either of a capacity of less than 7.6 m3 (2,008 gal), or an underground

tank with an offset fill line.

110.3 Any above ground gasoline tank of 7.6 m3 (2,008 gal) or less capacity

installed and in service prior to January 9, 1976, and equipped with a

submerged fill pipe.

(Amended 5/4/88; 1/20/93; 11/27/02)

8-5-111 Limited Exemption, Tank Removal From and Return to Service: The

requirements of Sections 8-5-304, 305, 306, 307 and 320 shall not apply to storage

tanks during or after tank decommissioning, and shall not apply during temporary

removal from service provided that the following is accomplished:

111.1 The operator provides notice to the APCO. This notification shall identify the

specific requirement for which an exemption is necessary and explain how

the planned or performed activities necessarily prevent compliance with

those requirements. The notification requirement may be satisfied in any

one of the following ways:

1.1 Three days prior to such work being done, written notice is received by

the APCO;

1.2 Telephone notification is made to the APCO prior to such work being

done, and written notice is received by the APCO within three days

after such work has been done.

111.2 The tank is in compliance prior to notification. The written notice shall

contain a statement that, to the best knowledge of the person providing

notification, the tank is in compliance, and the basis for that knowledge.

111.3 When the floating roof is resting on the leg supports, the process of filling,

emptying, and refilling shall be continuous and shall be accomplished as

rapidly as possible.

111.4 Vapor recovery shall be used on tanks so equipped during filling and

emptying procedures.

111.5 Emissions shall be minimized during the period of exemption. As much

product as possible shall be drained before any hatches are opened, and

tank degassing equipment and an associated approved emission control

system shall be connected and operating as soon as possible.

111.6 Written notice is not required when returning a tank to service after the above

listed work has been completed.

111.7 The requirements of Section 8-5-328 are satisfied.

(Amended 1/20/93; 12/15/99; 11/27/02)

8-5-112 Limited Exemption, Tanks in Operation: The requirements of Sections 8-5-304,

305, 306, 307 and 8-5-320 shall not apply to storage tanks during preventative

maintenance of a vapor control device, tank roof, roof fitting or tank seal; during

primary seal inspection; or during removal and installation of a secondary seal if the

following is accomplished:
Bay Area Air Quality Management District November 27, 2002

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112.1 The operator shall provide notification to the APCO. This notification shall

identify the affected tank and the specific requirement for which an

exemption is necessary, shall explain how the planned or performed

activities necessarily prevent compliance with those requirements, and shall

describe the measures to be taken to minimize emissions. For secondary

seal installations, the type of installed seal shall be specified. The

notification requirement may be satisfied as follows:

1.1 Three days prior to such work being done, written notice is received by

the APCO; or

1.2 Except for secondary seal replacements, which are subject to

subsection 8-5-112.1.1, telephone notification is made to the APCO

prior to such work being done, and written notice is received by the

APCO within three days after such work has been done.

112.2 The tank is in compliance with all District Regulations prior to the

commencement of the work and is certified in accordance with Section 8-5-

404.

112.3 Product shall be moved neither in nor out of the storage tank and emissions

shall be minimized.

112.4 The time of exemption allowed under this Section does not exceed 7 days.

(Adopted 9/4/85; Amended 5/4/88; 1/20/93; 12/15/99; 11/27/02)

8-5-113 Deleted May 4, 1988

8-5-114 Deleted May 4, 1988

8-5-115 Deleted May 4, 1988

8-5-116 Exemption, Gasoline Storage Tanks at Gasoline Dispensing Facilities: The

provisions of this Rule shall not apply to any underground gasoline storage tank

located at a gasoline dispensing facility subject to the requirements of Regulation 8,

Rule 7.

(Adopted January 20, 1993)

8-5-117 Exemption, Low Vapor Pressure: The provisions of this Rule, except for Section

8-5-307, shall not apply to tanks storing organic liquids with a true vapor pressure of

less than or equal to 25.8 mm Hg (0.5 psia) as determined by Sections 8-5-602 or

604.

(Adopted 1/20/93; Amended 11/27/02)

8-5-200 DEFINITIONS

8-5-201 Abatement Efficiency: A comparison of controlled emissions to those emissions

which would occur from a fixed or cone roof tank in the same product service without

an approved emission control system, expressed as a percentage. Baseline

emissions shall be calculated using the criteria in API Bulletin 2518.

(Amended 1/20/93; 11/27/02)

8-5-202 Storage Tank: Any container, reservoir, or tank used for the storage of organic

liquids, excluding tanks which are permanently affixed to mobile vehicles such as

railroad tank cars, tanker trucks or ocean vessels.

(Adopted 9/4/85; Amended 11/27/02)

8-5-203 Deleted November 27, 2002

8-5-204 Organic Liquid: Any organic compound that exists as a liquid at actual conditions of

use or storage.

(Adopted 9/4/85; Amended 1/20/93)

8-5-205 Gasoline: Petroleum distillates used as motor fuel with a Reid vapor pressure

greater than 4.0 psia.

(Adopted 9/4/85; Amended 5/4/88)

8-5-206 Gas Tight: A concentration of organic compounds, measured 1 cm or less from any

source, of less than 100 ppm (expressed as methane) above background, for any

point or item, except for pressure vacuum valves and atmospheric pressure relief

devices; and less than 500 ppm (expressed as methane) above background, for

pressure vacuum valves and atmospheric pressure relief devices only.

(Adopted 5/4/88; Amended 1/20/93; 11/27/02)

8-5-207 Approved Emission Control System: A system for reducing emissions to the

atmosphere that consists of a collection system and an abatement device, which is
Bay Area Air Quality Management District November 27, 2002

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approved in writing by the APCO and achieves the overall abatement efficiency

specified in the applicable standards section.

(Adopted 1/20/93; Amended 11/27/02)

8-5-208 Degassing: The process of removing organic gases from a tank.

(Adopted January 20, 1993)

8-5-209 External Floating Roof Tank: An open top tank with a storage vessel cover

consisting of a double deck or pontoon single deck which rests upon and is

supported by the liquid being contained.

(Adopted January 20, 1993)

8-5-210 Internal Floating Roof Tank: A tank with a floating cover or roof which rests upon

or is floated upon the liquid being contained, and which also has a fixed roof on top

of the tank shell to shield the floating roof from wind, rain and other elements. An

external floating roof tank which is retrofitted with a geodesic dome or other fixed roof

shall be considered to be an internal floating roof tank for the purposes of this rule.

(Adopted 1/20/93; Amended 11/27/02)

8-5-211 True Vapor Pressure: The vapor pressure of a liquid at storage temperature.

(Adopted 1/20/93; Amended 11/27/02)

8-5-212 Organic Compound: Any compound of carbon, excluding methane, carbon

monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates and

ammonium carbonate.

(Adopted January 20, 1993)

8-5-213 Viewport: An accessible opening in the fixed roof of an internal floating roof tank

that measures at least 0.75 meters (30 inches) on each side or at least 0.75 meters

(30 inches) in diameter.

(Adopted January 20, 1993)

8-5-214 Gauge Float: A device to indicate the level of liquid within a tank. The float rests on

the liquid surface inside a well in the tank.

(Adopted December 15, 1999)

8-5-215 Guidepole: An anti-rotation device that is fixed to the top and bottom of a tank,

passing through a well in a floating roof. Guidepoles may be solid or be equipped

with slots or holes for gauging purposes.

(Adopted December 15, 1999)

8-5-216 Zero Gap Pole Wiper Seal: A seal with no gap exceeding 0.06 inches between the

guidepole or gauge well and pole wiper seal.

(Adopted December 15, 1999)

8-5-217 Decommissioning: The removal of all organic liquid and gases from a storage tank

with the intent of no longer using the tank for storage of organic liquids or gases.

(Adopted November 27, 2002)

8-5-218 Stock Change: The removal of organic liquids from a tank prior to refilling the tank

with a different organic liquid.

(Adopted November 27, 2002)

8-5-219 Tank Cleaning: The process of washing or rinsing the interior of a storage tank, or

removing sludge, or rinsing liquid from a storage tank.

(Adopted November 27, 2002)

8-5-220 Temporary Removal From Service: The removal of organic liquid from a storage

tank for tank cleaning, stock change, tank repair, roof repair, or removal of

contaminated stock, followed by return to service.

(Adopted November 27, 2002)

8-5-221 Liquid Balancing: The process of reducing the vapor pressure of the contents of a

tank by adding lower-vapor pressure liquid without breaking tank vacuum, and, for

floating roof tanks, without landing the floating roof on its supports.

(Adopted November 27, 2002)

8-5-300 STANDARDS

8-5-301 Storage Tanks Control Requirements: A person shall not store organic liquid in

any storage tank unless such tank is equipped with a vapor loss control device that is

specified by the table below for the tank capacity, or for a higher capacity, and for the

true vapor pressure of the tank organic liquid contents, or for a higher true vapor

pressure.
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Tank Capacity True Vapor Pressure of Tank Organic Contents

>0.5 to ≤1.5 psia >1.5 to <11 psia ≥ 11 psia

≥1.0 m3 to ≤37.5 m3

(≥264 gallons to

≤9,906 gallons),

aboveground only

Submerged fill pipe,

internal floating

roof, external

floating roof, or

approved emission

control system

Pressure vacuum

valve, internal

floating roof,

external floating

roof, or approved

emission control

system

Pressure tank or

approved emission

control system

>37.5 m3 to <75 m3

(>9,906 gallons to

<19,803 gallons),

aboveground only

Submerged fill pipe,

internal floating

roof, external

floating roof, or

approved emission

control system

Pressure vacuum

valve, internal

floating roof,

external floating

roof, or approved

emission control

system

Pressure tank or

approved emission

control system

≥75 m3 to <150 m3

(≥19,803 gallons to

<39,626 gallons)

Submerged fill pipe,

internal floating

roof, external

floating roof, or

approved emission

control system

Internal floating

roof, external

floating roof, or

approved emission

control system

Pressure tank or

approved emission

control system

≥150 m3

(≥39,626 gallons)

Internal floating

roof, external

floating roof, or

approved emission

control system

Internal floating

roof, external

floating roof, or

approved emission

control system

Pressure tank or

approved emission

control system

(Amended, Renumbered 9/4/85; Amended 5/4/88; 1/20/93; 12/15/99; Amended, Renumbered 11/27/02)

8-5-302 Requirements for Submerged Fill Pipes: A submerged fill pipe must meet either

of the following requirements:

302.1 Where the tank is filled from the top, the end of the discharge pipe or nozzle

must be totally submerged when the liquid level is 15 cm (6 in.) from the

bottom of the tank.

302.2 Where the tank is filled from the side, the discharge pipe or nozzle must be

totally submerged when the liquid level is 46 cm (18 in.) from the bottom of

the tank.

(Adopted 9/4/85; Amended, Renumbered 11/27/02)

8-5-303 Requirements for Pressure Vacuum Valves: A pressure vacuum valve must meet

the following requirements:

303.1 The pressure vacuum valve must be set to either a pressure within 10% of

the maximum allowable working pressure of the tank, or at least 25.8 mm Hg

(0.5 psig) pressure.

303.2 The pressure vacuum valve must be properly installed, properly maintained,

and in good operating order, and must remain in a gas tight condition except

when operating pressure exceeds the valve set pressure.

(Amended 9/4/85; 5/4/88; 1/20/93; Amended, Renumbered, 11/27/02)

8-5-304 Requirements for External Floating Roofs: An external floating roof must meet

the following requirements:

304.1 The floating roof fittings must meet the requirements of Section 8-5-320.

304.2 The floating roof must be equipped with a primary seal that meets the

requirements of Section 8-5-321.

304.3 The floating roof must be equipped with a secondary seal that meets the

requirements of Section 8-5-322.

304.4 The floating roof must rest on the surface of the liquid tank contents, must be

properly installed and maintained, and must be in good operating condition.

There shall be no liquid tank contents on top of either the primary or

secondary seal, or on top of the floating roof (this requirement does not apply

to liquid which clings to the inside tank walls as the tank is drained, or to

liquid which drips from the tank walls onto the seals).

(Amended, Renumbered 9/4/85; Amended 5/4/88; 1/20/93; Amended, Renumbered 11/27/02)
Bay Area Air Quality Management District November 27, 2002

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8-5-305 Requirements for Internal Floating Roofs: An internal floating roof must meet the

following requirements:

305.1 For a tank with seals installed on or before February 1, 1993, the tank must

be equipped with one of the following:

1.1 A liquid mounted primary seal, mounted in full contact with the liquid in

the annular space between the tank shell and floating roof,

1.2 A metallic shoe primary seal, or

1.3 A vapor mounted primary and a secondary seal

If sections of seal with a total length equal to or greater than the diameter of

the tank are replaced at one time, or if sections of seal with a total cumulative

length equal to or greater than 50% of the total seal circumference are

replaced over time, then the seal shall be considered to be newly installed

and subject to subsection 8-5-305.2.

305.2 For a tank with seals installed after February 1, 1993, the tank must be

equipped with a liquid mounted or metallic shoe primary seal that meets the

requirements of Section 8-5-321 and a secondary seal that meets the

requirements of Section 8-5-322.

305.3 Internal floating roof tanks which are placed into service or de-gassed after

February 1, 1993 shall be equipped with at least 3 viewing ports in the fixed

roof of the tank. This requirement shall not apply to external floating roof

tanks retrofitted with domes or other fixed roofs after February 1, 1993, as

long as the dome consists of translucent panels through which sufficient light

passes to allow inspection of the floating roof seal.

305.4 The floating roof fittings must meet the requirements of Section 8-5-320.

305.5 The floating roof must rest on the surface of the liquid tank contents, must be

properly installed and maintained, and must be in good operating condition.

There shall be no liquid tank contents on top of either the primary or

secondary seal, or on top of the floating roof (this requirement does not apply

to liquid which clings to the inside tank walls as the tank is drained, or to

liquid which drips from the tank walls onto the seals).

(Amended, Renumbered 9/4/85; Amended 5/4/88; 1/20/93; Amended, Renumbered 11/27/02)

8-5-306 Requirements for Approved Emission Control Systems: An Approved Emission

Control System must be gas tight. It must also provide an abatement efficiency of at

least 95% by weight, except as allowed by subsection 8-5-328.1.2.

(Amended 1/20/93; Amended, Renumbered 11/27/02)

8-5-307 Requirements for Pressure Tanks and Blanketed Tanks: A pressure tank must

be maintained in a gas tight condition and must maintain working pressures sufficient

at all times to prevent organic vapor or gas loss to the atmosphere. Effective July 1,

2003, tanks blanketed with organic gases other than natural gas shall be maintained

in a gas tight condition.

(Adopted 9/4/85; Amended 5/4/88; 1/20/93; Amended, Renumbered 11/27/02)

8-5-310 Deleted May 4, 1988

8-5-311 Deleted November 27, 2002

8-5-312 Deleted January 20, 1993

8-5-313 Deleted January 20, 1993

8-5-314 Deleted January 20, 1993

8-5-320 Tank Fitting Requirements: The fittings on any floating roof storage tank subject to

Section 8-5-304 or 305 shall meet the following conditions:

320.1 Deleted November 27, 2002.

320.2 All openings through the floating roof, except pressure-vacuum valves and

vacuum breaker vents, shall provide a projection below the liquid surface to

prevent belching of liquid and reduce escaping organic vapors.

320.3 All openings through the floating roof, except floating roof legs, shall be

equipped with a gasketed cover, seal or lid, which shall at all times be in a

closed position and shall meet either of the following requirements, as

applicable, except as provided in subsections 8-5-320.4, 320.5 or 320.6.

3.1 The gasketed cover, seal or lid shall have no measurable gap

exceeding 0.32 cm (1/8 in.), except when the opening is in use.
Bay Area Air Quality Management District November 27, 2002

8-5-8

3.2 For inaccessible openings on internal floating roof tanks, there shall be

no visible gaps as viewed from the fixed roof manway or viewports,

except when the opening is in use.

320.4 Solid sampling or gauging wells, and similar fixed projections through a

floating roof such as an anti-rotational pipe, shall meet the following

conditions:

4.1 The well shall provide a projection below the liquid surface.

4.2 The well shall be equipped with a cover, seal or lid, which shall at all

times be in a closed position with no gap exceeding 0.32 cm (1/8 in.),

except when the well is in use.

4.3 The gap between the well and the roof shall be added to the gaps

measured to determine compliance of the secondary seal and in no

case shall exceed 1.3 cm (1/2 in.).

320.5 Slotted sampling or gauging wells, and similar fixed projections through a

floating roof such as an anti-rotational pipe, shall meet the following

conditions:

5.1 The well shall provide a projection below the liquid surface.

5.2 The well shall be equipped with the following: a sliding cover, a cover

gasket, a pole sleeve, pole wiper and an internal float and float wiper

designed to minimize the gap between the float and the well, provided

that the gap shall in no case exceed 1/2 in., or shall be equipped with a

well gasket, a zero gap pole wiper seal and a pole sleeve that projects

below the liquid surface.

5.3 The gap between the well and the roof shall be added to the gaps

measured to determine compliance of the secondary seal and in no

case shall exceed 1.3 cm (1/2 in.).

320.6 Any emergency roof drain shall be provided with a slotted membrane fabric

cover, or equivalent, that covers at least 90% of the area of the opening.

(Amended 9/4/85; 5/4/88; 1/20/93; 12/15/99; 11/27/02)

8-5-321 Primary Seal Requirements: A person shall not operate a storage tank equipped

with a primary seal subject to the requirements of Section 8-5-304 or 305 unless

such tank meets the following conditions:

321.1 There shall be no holes, tears, or other openings in the primary seal fabric

which allow the emission of organic vapors.

321.2 The seal shall be either a metallic shoe or a liquid mounted type, except as

provided in subsection 8-5-305.1.3.

321.3 Metallic-shoe-type seals shall be installed so that one end of the shoe

extends into the stored liquid and the other end extends a minimum vertical

distance of 61 cm (24 in.) for external floating roofs and 18 inches for internal

floating roofs above the stored liquid surface.

3.1 The geometry of the shoe shall be such that the maximum gap

between the shoe and the tank shell is no greater than double the gap

allowed by the seal gap criteria for a length of at least 46 cm (18 in.) in

the vertical plane above the liquid surface.

3.2 For welded tanks, no gap between the tank shell and the primary seal

shall exceed 3.8 cm (1-1/2 in.). No continuous gap greater than 0.32

cm (1/8 in.) shall exceed 10% of the circumference of the tank. The

cumulative length of all primary seal gaps exceeding 1.3 cm (1/2 in.)

shall be not more than 10% of the circumference, and the cumulative

length of all primary seal gaps exceeding 0.32 cm (1/8 in.) shall be not

more than 40% of the circumference.

3.3 For riveted tanks, no gap between the tank shell and the primary seal

shall exceed 6.4 cm (2-1/2 in.). The cumulative length of all primary

seal gaps exceeding 3.8 cm (1-1/2 in.) shall be not more than 10% of

the circumference.

321.4 For resilient-toroid-seal equipped tanks, no gap between the tank shell and

the primary seal shall exceed 1.3 cm (1/2 in.). The cumulative length of all

gaps exceeding 0.32 cm (1/8 in.) shall be not more than 5% of the

circumference.

(Amended 1/20/93; 12/15/99; 11/27/02)
Bay Area Air Quality Management District November 27, 2002

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8-5-322 Secondary Seal Requirements: A person shall not operate a storage tank

equipped with a secondary seal subject to the requirements of Sections 8-5-304 or

305, unless such tank meets the following conditions:

322.1 There shall be no holes, tears, or other openings in the secondary seal fabric

which allow the emission of organic vapors.

322.2 The secondary seal shall allow easy insertion of probes up to 3.8 cm (1-1/2

in.) in width in order to measure gaps in the primary seal.

322.3 No gap between the tank shell and the secondary seal shall exceed 1.3 cm

(1/2 in.). The cumulative length of all secondary seal gaps exceeding 0.32

cm (1/8 in.) shall be not more than 5% of the circumference of the tank.

322.4 For riveted tanks, the secondary seal shall consist of at least two sealing

surfaces, such that the sealing surfaces prevent the emission of organic

compounds around the rivets. Serrated sealing surfaces are allowable if the

length of serration does not exceed 15.2 cm (6 in.).

322.5 For welded external floating roof tanks with seals installed after September 4,

1985 or welded internal floating roof tanks with seals installed after February

1, 1993, no gap between the tank shell and the secondary seal shall exceed

1.5 mm (0.06 in.). The cumulative length of all secondary seal gaps

exceeding 0.5 mm (0.02 in.) shall be not more than 5% of the circumference

of the tank excluding gaps less than 5 cm (1.79 in.) from vertical weld seams.

If sections of seal with a total length equal to or greater than the diameter of

the tank are replaced at one time, or if sections of seal with a total cumulative

length equal to or greater than 50% of the total seal circumference are

replaced over time, then the seal shall be considered to be newly installed for

the purpose of this section.

322.6 The secondary seal shall extend from the roof to the tank shell and shall not

be attached to the primary seal.

(Amended 1/20/93; 11/27/02)

8-5-323 Deleted January 20, 1993

8-5-324 Deleted January 20, 1993

8-5-325 Deleted January 20, 1993

8-5-326 Deleted May 4, 1988

8-5-327 Deleted May 4, 1988

8-5-328 Tank Degassing Requirements:

328.1 For tanks larger than 75 m3

, the emissions of organic compounds resulting

from degassing shall be controlled by one of the following methods:

1.1 Liquid Balancing in which the resulting organic liquid has a true vapor

pressure less than 0.5 psia, or

1.2 An Approved Emission Control System which collects and processes

all organic vapors and gases and has an abatement efficiency of at

least 90% by weight. The system shall be operated until the

concentration of organic compounds in the tank is less than 10,000

ppm expressed as methane.

328.2 For all tanks subject to this rule, tank degassing shall not commence after

the District predicts an excess of the Federal or State Ambient Air Quality

Standard for ozone for the following day, unless emissions resulting from

degassing are controlled by one of the methods in subsection 8-5-328.1.1 or

328.1.2.

(Adopted 1/20/93; Amended 11/27/02)

8-5-329 Deleted November 27, 2002

8-5-330 Deleted November 27, 2002

8-5-400 ADMINISTRATIVE REQUIREMENTS

8-5-401 Inspection Requirements for External Floating Roof Tanks: Tanks subject to the

requirements of Section 8-5-304 shall be inspected by the operator as follows:

401.1 The entire circumference of each primary and secondary seal shall be

inspected for compliance with the requirements of Sections 8-5-321 and 8-5-

322 twice per calendar year at 4 to 8 month intervals. If a new primary or

secondary seal is installed, or if a primary or secondary seal is repaired, both
Bay Area Air Quality Management District November 27, 2002

8-5-10

seals shall be inspected at the time of the seal installation or repair. Flexible

wiper seals shall be inspected when the outer edge of the seal is curved

upward.

401.2 Tank fittings shall be inspected for compliance with the requirements of

Section 8-5-320 twice per calendar year at 4 to 8 month intervals.

(Amended 1/20/93; Amended, Renumbered 11/27/02)

8-5-402 Inspection Requirements for Internal Floating Roof Tanks: Tanks subject to the

requirements of Section 8-5-305 shall be inspected by the operator as follows:

402.1 The entire circumference of each primary and secondary seal shall be

inspected for compliance with the requirements of Sections 8-5-321 and 8-5-

322. The time between inspections shall not exceed 10 years. If a new

primary or secondary seal is installed, or if a primary or secondary seal is

repaired, both seals shall be inspected at the time of the seal installation or

repair. Flexible wiper seals shall be inspected when the outer edge of the

seal is curved upward.

402.2 The entire circumference of the outermost seal (secondary seal where so

equipped, or primary seal where no secondary seal is required) shall be

visually inspected for compliance with the requirements of subsections 8-5-

305.1, 8-5-305.2, 8-5-305.3, 8-5-321.1 and 8-5-322.1 twice per calendar

year at 4 to 8 month intervals. Flexible wiper seals shall be inspected when

the outer edge of the seal is curved upward.

402.3 Tank fittings shall be inspected for compliance with the requirements of

Section 8-5-320 twice per calendar year at 4 to 8 month intervals. Standards

involving gap measurements shall be checked whenever the tank roof is

accessible, but need not be checked more frequently than twice per calendar

year.

(Amended 1/20/93; Amended, Renumbered 11/27/02)

8-5-403 Inspection Requirements for Pressure Vacuum Valves: Tanks subject to the

requirements of Section 8-5-303 shall be inspected for compliance with the

requirements of Section 8-5-303 twice per calendar year at 4 to 8 month intervals.

(Adopted November 27, 2002)

8-5-404 Certification: Within 60 days of any inspection or source test required in Section 8-

5-401, 402, 403 or 502, a report shall be submitted which certifies compliance with

each individual requirement of these Sections.

(Amended, Renumbered 9/4/85; Amended 5/4/88; 1/20/93; 11/27/02)

8-5-405 Information Required: All reports relating to seal condition and gap measurements

shall include the following information:

405.1 Date of inspection.

405.2 Actual gap measurements between the tank shell and seals, both the

primary seal and the secondary seal, shall be measured around the full

circumference of the tank.

405.3 Data, supported by calculations, showing whether or not the requirements of

Sections 8-5-320, 321 and 322 are being met.

(Amended, Renumbered 9/4/85; Amended 5/4/88; 1/20/93)

8-5-410 Deleted May 4, 1988

8-5-500 MONITORING AND RECORDS

8-5-501 Records:

501.1 A person whose tanks are subject to this rule shall keep an accurate record

of the type and amount of liquids stored, type of blanket gases used, and the

true vapor pressure ranges of such liquids and gases. Effective January 1,

2003, these records shall be kept for at least 24 months.

501.2 For internal and external floating roof tanks, a person who replaces all or part

of a primary or secondary seal shall keep an accurate record of the length of

seal replaced and the date(s) on which replacement occurred. Effective

January 1, 2003, these records shall be kept for at least 10 years.

(Amended 1/20/93; 11/27/02)

8-5-502 Tank Degassing Annual Source Test Requirement: Any person operating an

Approved Emission Control System to comply with the requirements of subsection 8-

5-328.1.2 shall test the system as prescribed in subsection 8-5-603.2.
Bay Area Air Quality Management District November 27, 2002

8-5-11

(Adopted 1/20/93; Amended 11/27/02)

8-5-503 Portable Hydrocarbon Detector: Any instrument used for the measurement of

organic compounds as specified by Sections 8-5-303.2, 306 and 307 shall be a

combustible gas indicator that meets the specifications and performance criteria of

and has been calibrated in accordance with EPA Reference Method 21 (40 CFR 60,

Appendix A).

(Adopted 1/20/93; Amended 11/27/02)

8-5-600 MANUAL OF PROCEDURES

8-5-601 Analysis of Samples, Reid Vapor Pressure: Samples of organic compounds as

specified in this Rule shall be analyzed for Reid Vapor Pressure as prescribed in the

Manual of Procedures, Volume III, Lab Method 13.

(Amended 9/4/85; 5/4/88)

8-5-602 Analysis of Samples, True Vapor Pressure: Samples of organic compounds not

listed in Table I shall be analyzed for true Vapor Pressure at the tank storage

temperature as prescribed in the Manual of Procedures, Volume III, Lab Method 28.

(Adopted 9/4/85; Amended 5/4/88)

8-5-603 Determination of Emissions: Emissions of organic compounds shall be

determined as follows:

603.1 Emissions of organic compounds as specified in Section 8-5-306 shall be

measured as prescribed in the Manual of Procedures, Volume IV, ST-4.

603.2 Emissions of organic compounds as specified in subsection 8-5-328.1.2 shall

be measured as prescribed in the Manual of Procedures, Volume IV, ST-7.

(Renumbered 9/4/85; Amended 1/20/93; 11/27/02)

8-5-604 Determination of Applicability: Table I shall be used to determine if a storage tank

is subject to the requirements of this rule. For organic compounds not listed in

Table I, refer to Sections 8-5-601 or 602.

(Adopted 9/4/85; Amended 5/4/88; 1/20/93)

8-5-605 Pressure-Vacuum Valve Gas Tight Determination: Determination of organic

compound leak concentrations as specified by Sections 8-5-303.2, 306 and 307 shall

be conducted by EPA Reference Method 21 (40 CFR 60, Appendix A).

(Adopted 1/20/93; Amended 11/27/02)
Bay Area Air Quality Management District November 27, 2002

8-5-12

TABLE I

STORAGE TEMPERATURE VERSUS TRUE VAPOR PRESSURE (TVP)

Max. Temp. 0

F Not to

Exceed

Density

(lb/gal)

Reference

Gravity API IBP o

F

0.5 Psia

TVP

1.5 Psia

TVP

Crude Oils:* - - - -

San Joaquin Valley - - 390 249 -

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 -

Asphalts:

60-100 pen. - - - 490 550

120-150 pen. - - - 450 500

200-300 pen. - - - 360 420

Organic Compounds:

Acetone 6.6 47 133 - 35

Acrylonitrile 6.8 41.8 173 30 62

Benzene 7.4 27.7 176 34 70

Carbon Disulfide 10.6 22.1 116 - 10

Carbon Tetrachloride 13.4 - 170 20 63

Chloroform 12.5 - 142 - 40

Cyclohexane 6.5 49.7 177 30 65

1,2 Dichloroethane 10.5 - 180 35 75

Ethyl Acetate 7.5 23.6 171 38 70

Ethyl Alcohol 6.6 47.0 173 55 85

Isopropyl Alcohol 6.6 47.0 181 62 95

Methyl Alcohol 6.6 47.0 148 30 62

Methyl Ethyl Ketone 6.7 44.3 175 30 70

Toluene 7.3 30 231 75 120

Vinylacetate 7.8 19.6 163 30 65

* True vapor pressure for crude oils should be determined from the specific crude slate.