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Attachment 1 Exhibit B <br /> 20.24.270 CFC Section 5704.2.7.5.8 amended—Overfill Prevention Exception. <br /> Section 5704.2.7.5.8, Overfill Prevention Exception, is amended to read: <br /> Exception: Outside aboveground tanks with a capacity of 100 gallons(378 L)or less. <br /> 20.27.280 CFC Chapter 60 Title amended—Highly Toxic and Toxic Materials. <br /> CFC Chapter 60 title is amended to read: <br /> CHAPTER 60 <br /> HIGHLY TOXIC AND TOXIC MATERIALS AND MODERATELY TOXIC GASES <br /> INCLUDING THOSE USED AS REFRIGERANTS <br /> 20.24.290 CFC Section 6004.1 amended—General. <br /> Section 6004.1 is hereby amended and Table 6004.1 is added to read as follows: <br /> 6004.1 General.Materials that are stored and used as a gas whether or not the material meets the <br /> definition of a compressed gas, and that meet the definition of a highly toxic,toxic or moderately toxic <br /> gas shall comply with Section 6004. <br /> Performance based design alternatives may be used for refrigeration systems. <br /> Moderately toxic gases with an LCso less than or equal to 3,000 parts per million shall comply with the <br /> requirements for toxic gases in Sections 6004.2.2.1 through 6004.2.2.10.4. <br /> Moderately toxic gases with an LCso more than 3000 parts per million but not greater than 5000 parts per <br /> million and exceeding the maximum threshold quantity, as determined by Section 6004.1.6, shall comply <br /> with the requirements for toxic gases in Sections 6004.2.2.1 through 6004.2.2.7. <br /> The minimum threshold quantity for highly toxic,toxic and moderately toxic gases,vapors and mists for <br /> indoor and exterior storage and use are set forth in Table 6004.1. <br /> Table 6004.1 <br /> Minimum Threshold Quantities for Highly Toxic,Toxic and Moderately Toxic Gases <br /> Highly Toxic 0 cubic feet <br /> Toxic 10 cubic feet <br /> Moderately Toxic 20 cubic feet <br /> 20.24.300 CFC Section 6004.1.2 amended—Gas Cabinets. <br /> Section 6004.1 is hereby amended as follows: <br /> 6004.1.2 Gas cabinets.Gas cabinets containing highly toxic,toxic or moderately toxic gases shall <br /> comply with Section 5003.8.6 and the following requirements: <br /> [balance to remain the same] <br /> 20.24.310 CFC Section 6004.1.3 amended—Exhausted Enclosures. <br /> Section 6004.1.3 is hereby amended as follows: <br /> Page 29 of 60 <br />