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Maximum Threshold Quantity (Max TQ) is the maximum quantity of a moderately toxic <br />or toxic gas, which may be stored in a single vessel before a more stringent category of <br />regulation is applied. The following equation shall be used to calculate the Max TQ: <br />Max TQ (pounds) = LC50 (ppm) x 2 Ib. <br />Gas Mixtures, the LC50 value for a gas mixture containing toxic, highly toxic or <br />moderately toxic components shall be calculated using the formula in Appendix E, <br />Section 103.1.3.1 <br />Amend Sec. 3704 to read: <br />Section 3704 Highly Toxic, Toxic and Moderately Toxic Gases Including Those Used As <br />Refrigerants. <br />Add Sec. 3704.1.4 to read: <br />3704.1.4 Automatic Shut-Off Valve. An automatic shut-off valve, which is of a fail-safe <br />to close design, shall be provided to shut off the supply of highly toxic gases for any of <br />the following: <br />1. Activation of a manual fire alarm system. <br />2. Activation of the gas detection system. <br />3. Failure of emergency power. <br />4. Failure of primary containment. <br />5. Seismic activity. <br />6. Failure of required ventilation. <br />7. Manual activation at an approved remote location. <br />Add Sec. 3704.1.5 to read: <br />3704.1.5 Emergency Control Station. Signals from emergency equipment used for <br />highly toxic gases shall be transmitted to an emergency control station or other <br />approved monitoring station, which is continually staffed by trained personnel. <br />Add Sec. 3704.1.6 to read: <br />3704.1.6 Maximum Threshold Quantity. Toxic gases stored or used in quantities <br />exceeding the maximum threshold quantity in a single vessel per control area or <br />outdoor control area shall comply with the additional requirements for highly toxic gases <br />of Section 3704 of this code. <br />Moderately toxic gases stored or used in quantities exceeding the maximum threshold <br />quantity. in a single vessel per control area or outdoor control area shall comply with the <br />additional requirements for toxic gases of Section 3704 of this code <br />Add Section 3704.1.7 to read: <br />3704.1.7 Reduced Flow Valve. All containers of materials other than lecture bottles <br />containing Highly Toxic material and having a vapor pressure exceeding 29 psia shall <br />be equipped with a reduced flow valve when available. If a reduced flow valve is not <br />97 <br />