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 Tan ks 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 Approv ed 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, 2002Bay Area Air Quality Management District November 27, 2002 8-5-2 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 DeterminationBay Area Air Quality Management District November 27, 2002 8-5-3 

### 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 em issions from the following sources: 110.1 Storage tanks having a c apacity of less than 1.0 m 3 (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 m 3 (2,008 gal), or an underground tank with an offset fill line. 110.3 Any above ground gasoline tank of 7.6 m 3 (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 ex emption is necessary and explain how the planned or performed activities necessarily prevent compliance with those requirements. The notificati on requirement may be satisfied in any one of the following ways: 1.1 Three days prior to such work bei ng 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 bes t knowledge of the person providing notification, the tank is in compli ance, 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 asso ciated approved emission control system shall be connected and operating as soon as possible. 111.6 Written notice is not required when retu rning a tank to service after the above listed work has been completed. 111.7 The requirements of Sect ion 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, tankroof, 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 8-5-4 112.1 The operator shall provide notification to the APCO. This notification shall identify the affected tank and the s pecific requirement for which an exemption is necessary, shall ex plain how the planned or performed activities necessarily prevent compli ance with those requirements, and shall describe the measures to be taken to minimize emissions. For secondary seal installations, the type of insta lled seal shall be specified. The notification requirement may be satisfied as follows: 1.1 Three days prior to such work bei ng done, written notice is received by the APCO; or 1.2 Except for secondary seal repl acements, which are subject to subsection 8-5-112.1.1, telephone not ification 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 a ll District Regulations prior to the commencement of the work and is certif ied 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 s ubject 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 or ganic 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, ex pressed 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 permanentlyaffixed 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 vac uum valves and atmospheric pressure relief devices; and less than 500 ppm (expressed as methane) above background, for pressure vacuum valves and atmos pheric 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 collecti on system and an abatement device, which isBay Area Air Quality Management District November 27, 2002 8-5-5 approved in writing by the APCO and achi eves 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 r oof 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 fi xed 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 t ank 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 rinsi ng 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, st ock 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 landi ng 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.Bay Area Air Quality Management District November 27, 2002 8-5-6 Tank Capacity True Vapor Pressure of Tank Organic Contents

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

≥ 1.0 m 3 to ≤ 37.5 m 3 ( ≥ 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 m 3 to <75 m 3 (>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 m 3 to <150 m 3 ( ≥ 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 m 3 ( ≥ 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 t op, 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 si de, 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 meetthe 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 surf ace of the liquid tankcontents, must be properly installed and maintained, and must be in good operating condition. There shall be no liquid tank content s on top of either the primary or secondary seal, or on top of the floati ng roof (this requirement does not apply to liquid which clings to the inside tankwalls 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 8-5-7 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 se ctions 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 sha ll be considered to be newly installed and subject to subsection 8-5-305.2. 305.2 For a tank with seals installed a fter 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 ar e 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 translu cent panels through which sufficient light passes to allow inspection of the floating roof seal. 305.4 The floating roof fittings must meetthe requirements of Section 8-5-320. 305.5 The floating roof must rest on the surf ace of the liquid tankcontents, must be properly installed and maintained, and must be in good operating condition. There shall be no liquid tank content s on top of either the primary or secondary seal, or on top of the floati ng roof (this requirement does not apply to liquid which clings to the inside tankwalls 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 mustalso 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 ot her 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-rotati onal 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-rotati onal 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 pr ovided with a slotted membrane fabric cover, or equivalent, that covers atleast 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 r equirements of Section 8-5-304 or 305 unless such tank meets the following conditions: 321.1 There shall be no holes, tears, or ot her 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 in stalled 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 sha ll be such that the maximum gap between the shoe and the tank she ll 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 t he 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 t he 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 t anks, 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 8-5-9 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 ot her 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 m easure gaps in the primary seal. 322.3 No gap between the tank shell and t he 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 tan ks with seals installed after September 4, 1985 or welded internal floating roof tan ks 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 se ctions 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 t he 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 m 3 , the emissions of organic compounds resulting from degassing shall be controlled by one of the following methods: 1.1 Liquid Balancing in which the re sulting organic liquid has a true vapor pressure less than 0.5 psia, or 1.2 An Approved Emission Control Sy stem 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 ex cess 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 r equirements 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 pr imary or secondary seal is repaired, bothBay Area Air Quality Management District November 27, 2002 8-5-10 seals shall be inspected at the time of t he seal installation or repair. Flexible wiper seals shall be inspected when t he 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 r equirements 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 atthe 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 out ermost seal (secondary seal where so equipped, or primary seal where no se condary 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. Flex ible 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 c hecked whenever the tank roof is accessible, but need not be checked mo re 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 ca lendar 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 s ubmitted 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 t he 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, show ing 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 complywith 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 Se ctions 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 s pecified 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 spec ified 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 specifi ed 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 shoul d be determined from the specific crude slate.