Outdated Standard Exemptions 73-80, April 25, 1986

Exemptions

Clicking on a highlighted number below links you to the standard exemption.

73. Any portable rock crusher with a production rate of 200 ton/hr or less that operates according to the following conditions:

(a) Operating schedule of the plant does not exceed 1600 hours per year.
(b) All in-plant haul roads and stockpiles are sprinkled with water and/or chemicals as necessary to achieve maximum control of dust emissions.
(c) Water sprays are located at all belt transfer points, shaker screens and inlet and outlet of all crushers and used as necessary to achieve maximum control of dust emissions.
(d) The plant is located at least 1/2 mile from any recreational area or residence or other structure not occupied or used solely by the owner of the facility or the owner of the property upon which the facility is located.
(e) The plant is located at least 1000 feet from any state or federal highway not currently under maintenance or construction.
(f) Before construction of the facility begins, written site approval is received from the Executive Director of the Texas Air Control Board and the facility shall be registered with the appropriate Regional Office using Form PI-7 including current Table 17.

74. Any grain handling, storage and drying facility which satisfies the following conditions:

(a) The total storage capacity of the new and any existing facility or facilities does not exceed 1,500,000 bushels.
(b) The facility is located at least 1/2 mile from any recreational area or residence or other structure not occupied or used solely by the owner of the facility or the owner of the property upon which the facility is located.
(c) Before construction of the facility begins, written site approval is received from the Executive Director of the Texas Air Control Board and the facility shall be registered with appropriate Regional Office using Form PI-7.

The installation of additional grain storage capacity which satisfies the following conditions:

(a) There is no increase in hourly grain handling capacity.
(b) Existing grain receiving and loadout facilities are utilized.
(c) Grain is conveyed by closed conveying systems with no air suction pulled on any conveying unit.
(d) Written site approval is received from the Executive Director before construction begins for facilities utilizing existing grain receiving facilities when new gravity or auger loadout systems are installed.

75. Surface coating facilities in which no metal spraying or metalizing is done and the emission of volatile organic paint solvents is less than 6.0 pounds per hour (lb/hr) and 500 pounds per week, if the following conditions are satisfied:

(a) The following conditions apply to indoor or confined area facilities:

(1) If the facility is a spraying operation, all spraying is conducted in a spray booth or work area in which the emissions of particulate matter are controlled by either a water wash system or a dry filter system. For either system, the particulate removal efficiency shall be not less than 90%; and:

(A) The average volumetric flow of ventilating air through the spray booth shall be at least 100 cubic feet per minute (ft/min) per square foot of booth cross-section, with a minimum face velocity at the opening of 50 ft/min, and

(B) The face velocity at the filter media shall not exceed 250 ft/min or that specified by the filter media manufacturer.

(b) The following conditions apply to outdoor or nonconfined area facilities:

2. All coating materials used shall be a resin pigment combination dissolved in a high solvent-power solvent (lacquer) where drying occurs by evaporation of the solvent and deposition of the resin and pigment, and
4. No outdoor spraying is done if the wind speed exceeds 13 miles per hour, and
6. No spraying is conducted less than 20 feet from the property line and 100 feet from the nearest residence.

76. Any new or modified pilot plant provided that the following conditions are satisfied:

(a) The facility does not emit any chemical having a health threshold limit value of less than 1 ppm_v as specified by OSHA or ACGIH. This exemption does not apply to pilot plants using chemicals for which an OSHA or ACGIH threshold limit does not exist.
(b) The facility emits less than one (1) pound per hour of any air contaminant.
(c) The plant is located at least 1/4 mile form any recreational area or residence or other structure not occupied or used solely by the owner of the facility or the owner of the property upon which the facility is located.
(d) The facility is constructed and operated only for the purpose of:

2. Testing the manufacturing or marketing potential of a proposed product, or
4. Defining the design of a larger plant, or
6. Studying the behavior of an existing plant through modeling in the pilot plant.

77. Any wet sand and gravel production facility that obtains its material from subterranean and subaqueous beds where the deposits of sand and gravel are consolidated granular materials resulting from natural disintegration of rock and stone and whose production rate is 500 tons/hr or less. All permanent in-plant roads shall be paved and cleaned as necessary or watered as necessary to achieve maximum control of dust emissions.

78. Hydrochloric acid storage tanks used exclusively for the storage of hydrochloric acid with an acid strength of 38% by weight or less. If an acid more concentrated than 20% by weight is stored, the tank vent must be controlled to reduce emissions by at least 99%.

79. Iron sponge gas treating units processing streams containing less than sixty pounds per hour of hydrogen sulfide provided that the following conditions are satisfied:

(a) The plant is located at least 1/4 mile from any recreational area or residence or other structure not occupied or used solely by the owner of the facility or the owner of the property upon which the facility is located.
(b) During replacement of the iron oxide impregnated chips, the unit is (a) isolated from the main system and the pressure is reduced to 0.5 psig or less through a gas fired flare, or (b) sulfur compound emissions to the atmosphere do not exceed one ton per year replacement.
(c) The spent iron oxide chips being replaced are properly handled to avoid spontaneous ignition and avoid an odor nuisance.

80. Any smokeless gas flare provided that the following conditions are satisfied:

(a) The flare burns a combustible mixture of gases containing only carbon, hydrogen, nitrogen, oxygen, sulfur, chlorine or compounds derived from these elements. When the gas stream to be burned has a net or lower heating value of more than 200 Btu per cubic foot (Btu/ft³), prior to the addition of air, it may be considered combustible.
(b) The flare is equipped with a flare tip designed to provide good mixing with air, flame stability and a tip velocity less than 60 feet per second (fps) for gases having a lower heating value less than 1,000 Btu/ft³ or a tip velocity less than 400 fps for gases having a lower heating value greater than 1,000 Btu/ft³.
(c) The flare is equipped with a continuously burning pilot system or other automatic ignition system that assures gas ignition and provides immediate notification of appropriate personnel when the ignition system ceases to function. A flare burning only natural gas containing less than 24 parts per million by volume of sulfur compounds is exempted from the notification requirement, but not the automatic ignition requirement.
(d) For flares burning gases containing sulfur, chlorine or compounds containing either element, the flare shall (a) be located at least 1/4 mile from any recreational area or residence or other structure not occupied or used solely by the owner of the flare or the owner of the property upon which the flare is located and (b) be registered with the appropriate Regional Office using Form PI-7 prior to construction of a new flare or prior to the use of an existing flare for the new service.
(e) For flares emitting sulfur dioxide or hydrogen chloride, the heat release of the flare shall be greater than or equal to the following values:

For HCL Q = 2.73 x 10⁵ x HCl

For SO₂ Q = 0.53 x 10⁵ x SO₂

Where Q = heat release, BTU/hr, based on lower heating value
HCl = HCl emission rate, pounds per hour (lb/hr)
SO₂ = SO₂ emission rate, lb/hr

(f) Under no circumstances shall liquids be burned in the flare.

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