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8 <br /> 350 square feet (33 m2) using Class I or Class 11 liquids. <br /> 105.6.19 Fruit and Crop Ripening (Optional Permit) <br /> An operational permit is required to operate a fruit- or crop-ripening facilfty or <br /> conduct a fruit-ripening process using ethylene gas. <br /> 105.6.20 Fumigation and Insecticidal Fogging (Mandatory Permit) <br /> An operational permit is required to operate a business of fumigation or insecticidal <br /> fogging, and to maintain a room, vault or chamber in which a toxic or <br /> flammable fumigant is used. <br /> 105.6.21 Hazardous Materials (Optional Permit) <br /> An operational permit is required to store, transport on site, dispense, use or <br /> handle hazardous materials in excess of the amounts listed in Table 105.6.21. <br /> TABLE 105.6.21 PERMIT AMOUNTS FOR HAZARDOUS MATERIALS <br /> TYPE OF MATERIAL AMOUNT <br /> Combustible liquids See Section 105.6.17 <br /> Corrosive materials <br /> Gases See Section 105.6.9 <br /> Liquids 55 gallons <br /> Solids 1000 pounds <br /> Explosive materials See Section 105.6.15 <br /> Flammable materials <br /> Gases See Section 105.6.9 <br /> Liquids See Section 105.6.17 <br /> Solids 100 pounds <br /> Highly t� materials <br /> Gases See Section 105.6.9 <br /> Liquids Any Amount <br /> Solids Any Amount <br /> Oxidizing materials <br /> Gases See Section 105.6.9 <br /> Liquids <br /> Class 4 Any Amount <br /> Class 3 1 gallons <br />