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20.24.240 <br />[ii] When portable tanks or cylinders are <br />equipped with approved reduced flow <br />valves, the worst case release will be deter- <br />mined by the maximum achievable flow <br />from the valve as determined by the valve <br />manufacturer or the gas supplier. Reduced <br />flow and excess flow valves shall be per- <br />manently marked to indicate the maximum <br />design flow rate. Such markings shall indi- <br />cate the flow rate for air under standard <br />conditions. <br />(f) Exterior Storage. <br />(1) General. Persons responsible for a <br />facility where there is exterior storage of <br />any regulated material shall comply with <br />the provisions of this subsection and of the <br />Uniform Building Code as adopted and <br />amended by the Pleasanton Municipal <br />Code. <br />(2) Distance Limitation to Exposures. Exte- <br />rior storage of regulated materials shall not <br />be within 75 feet of a building, structure, <br />property line, street, alley, public way or <br />exit to a public way unless the storage is <br />shielded by a structure which has a mini- <br />mum fire resistive rating of two hours and <br />which interrupts the line of sight between <br />the storage and the exposure. The shielding <br />structure shall be at least five feet from any <br />exposure. The shielding structure shall have <br />not more than two sides which shall be at <br />approximately 90-degree directions. <br />(3) Openings in Buildings Subject to Expo- <br />sure. When an exterior storage area is <br />located within 75 feet of a building, open- <br />ings into the building other than piping <br />shall not be above the height of the top of <br />the shielding structure referred to in sub- <br />section (f)(2) of this section or within 50 <br />feet horizontally from the storage area, <br />whether or not protected by a shielding <br />structure. <br />(4) Air Intakes. No exterior storage area for <br />regulated materials shall be within 75 feet <br />of any air intake. <br />(5) Canopies. Portable tanks and cylinders <br />stored outside of building shall be stored <br />under a canopy constructed of non-combus- <br />tible materials. Such exterior storage shall <br />not be considered indoor storage. An auto- <br />matic fire-sprinkler system, or alternative <br />systems as determined by the Fire Chief for <br />materials incompatible with water, shall be <br />provided for canopies installed for the <br />storage of regulated materials. <br />(6) Stationazy Tank Controls. Controls on <br />stationazy tanks shall be in accordance with <br />the following: <br />[i] Pressure-relief devices shall be vented <br />to a treatment system designed in accor- <br />dance with the provisions of subsection <br />(e)(3) of this section. <br />[ii] Where .filling shall be provided with a <br />means of local exhaust. Such exhaust shall <br />be designed to capture fumes and vapors. <br />The exhaust shall be directed to a treatment <br />system designed in accordance with the <br />provisions of subsection (e)(3) of this sub- <br />section. <br />[iii] Stationary tanks shall be provided with <br />a means of excess flow control on all tank <br />inlet or outlet connections. Inlet connec- <br />tions that are designed to preclude back <br />flow and pressure-relief devices aze exempt <br />from this requirement. <br />(7) Gas Cabinets for Leaking Cylinders. <br />[i] At least one gas cabinet or exhausted <br />enclosure shall be provided for the han- <br />dling of leaking cylinders. The cabinet or <br />enclosure shall be within or adjacent to the <br />exterior storage area and connected to a <br />treatment system as specified in subsection <br />(e)(3) of this section. <br />(Pleasanton April 2003) '710_(2 <br />