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Ordinance No. 2197 Exhibit B Page 21 CHAPTER 60 HIGHLY TOXIC AND TOXIC MATERIALS AND MODERATELY TOXIC GASES INCLUDING THOSE USED AS REFRIGERANTS 20.24.290 CFC Section 6004.1 amended — General. Section 6004.1 is hereby amended, and Table 6004.1 is added to read as follows: 6004.1 General. Materials that are stored and used as a gas whether or not the material meets the definition of a compressed gas, and that meet the definition of a highly toxic, toxic or moderately toxic gas shall comply with Section 6004. Performance based design alternatives may be used for refrigeration systems. Moderately toxic gases with an LC50 less than or equal to 3,000 parts per million shall comply with the requirements for toxic gases in Sections 6004.2.2.1 through 6004.2.2.10.4. Moderately toxic gases with an LC50 more than 3000 parts per million but not greater than 5000 parts per million and exceeding the maximum threshold quantity, as determined by Section 6004.1.6, shall comply with the requirements for toxic gases in Sections 6004.2.2.1 through 6004.2.2.7. The minimum threshold quantity for highly toxic, toxic and moderately toxic gases, vapors and mists for indoor and exterior storage and use are set forth in Table 6004.1. Table 6004.1 Minimum Threshold Quantities for Highly Toxic, Toxic and Moderately Toxic Gases Highly Toxic 0 cubic feet Toxic 10 cubic feet Moderately Toxic 20 cubic feet 20.24.300 CFC Section 6004.1.2 amended — Gas Cabinets. Section 6004.1 is hereby amended as follows: 6004.1.2 Gas cabinets. Gas cabinets containing highly toxic, toxic or moderately toxic gases shall comply with Section 5003.8.6 and the following requirements: [balance to remain the same] 20.24.310 CFC Section 6004.1.3 amended — Exhausted Enclosures. Section 6004.1.3 is hereby amended as follows: 6004.1.2 Exhausted enclosures. Exhausted enclosures containing highly toxic, toxic or moderately toxic gases shall comply with Section 5003.8.5 and the following requirements: [balance to remain the same] 20.24.320 CFC Sections 6004.1.4 added —Automatic shut-off valve. Section 6004.1.4 is added to read: 6004.1.4 Automatic shut-off valve. An automatic shut-off valve, which is of a fail-safe to close design, shall be provided to shut off the supply of highly toxic gases as close as possible to the supply container for any of the following: 1. Activation of a manual fire alarm system. 2. Activation of the gas detection system.