875—140.4 (89B) Significant amounts.
	 140.4(1) Definition. A “significant amount” means the amount of a hazardous chemical(s) meeting any of the following criteria:
	  a.   	 Any amount of a hazardous chemical which is classified as follows:
	 (1) 	 A U.S. Department of Transportation Class A or Division 1.1 or 1.2 explosive;
	 (2) 	 A U.S. Department of Transportation Class B or Division 1.3 explosive;
	 (3) 	 A U.S. Department of Transportation Class A poison, a Division 2.3 poison gas or a Division 6.1 package group I inhalation hazard poison;
	 (4) 	 Reserved;
	 (5) 	 A U.S. Department of Transportation flammable solid or Division 4.3 material with a “dangerous when wet” warning;
	 (6) 	 A U.S. Department of Transportation yellow III label radioactive material;
	 (7) 	 An NFPA 704-1980 health rating of greater than or equal to 3;
	 (8) 	 An NFPA 704-1980 flammability rating of 4; or
	 (9) 	 An NFPA 704-1980 reactivity rating of 4.
	  b.   	 The aggregate amount of hazardous chemicals stored, placed, or used at the building, structure, or location is greater than or equal to 25 gallons of liquid or 250 pounds of nonliquid where the numerical rating of the hazardous chemical based on the NFPA 704-1980 system meeting any of the following criteria:
	 (1) 	 Health rating of greater than or equal to 2;
	 (2) 	 Flammability rating greater than or equal to 3; or
	 (3) 	 Reactivity rating of greater than or equal to 2.
If the hazardous chemical in both a liquid and nonliquid state, the aggregate amount measurement shall be made considering the combined poundage.
	 140.4(2) The requirements of this rule shall be superseded by other state or federal laws where those regulations are more restrictive.