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floor consists of 2 X 4 slats, and the mechanical ventilation exhausts through this <br />floor to the exterior loading dock. As at Echo Hollow, this ventilation must be <br />switched on. This shed also has no chlorine detection system, treatment system, or <br />sprinklers. <br />POOLS -- UFC RECOMMENDATIONS <br />It may be prudent to consider less hazardous chlorine delivery systems, such as the <br />use of solid or liquid chlorine rather than gaseous chlorine. Assuming continued use <br />of chlorine gas, the number of chlorine cylinders in storage should be kept to a <br />minimum. Article 80 requires cylinders of toxic gas to be stored either in separate <br />gas storage rooms, in exhausted enclosures, or in gas cabinets. Exhausted enclosures <br />or gas cabinets must: <br />1. Be operated at negative pressure compared to the surrounding area; <br />2. Permit quick access to internal equipment controls; <br />3. Be internally sprinllered; <br />4. Have constantly operating mechanical ventilation that is connected to an exhaust <br />system; and <br />5. Have self - closing doors (gas cabinets only). <br />A single gas cabinet should contain no more than three 150 -1b. cylinders. (The UFC <br />does not specify such limits for exhausted enclosures.) Even with storage in gas <br />cabinets or exhausted enclosures, an external leak could develop, such as in chlorine <br />conveyance piping or chlorination equipment; therefore, the chlorine distribution <br />system should be designed so that a leak outside of a gas cabinet will cause flow to <br />stop immediately from a point within the cabinet or enclosure. <br />All chlorine storage rooms should be outfitted with a continuous gas - detection <br />system designed to detect a chlorine concentration of 1 ppm. Readings at or above <br />this limit should initiate a local alarm and signal someone on a 24 -hr. basis. The <br />alarm should be both audible and visual, designed to warn people in the immediate <br />vicinity of each storage room. (These detectors could be shut off temporarily while <br />chlorine cylinders are changed.) <br />Exhaust from chlorine storage areas should be ducted to a treatment system that <br />can handle the accidental release of gas, either by dilution, absorption, containment, <br />or some other process. The system should be designed to handle the release of an <br />entire 150 -1b chlorine cylinder over a 5- minute period, and to prevent any emission <br />of chlorine to the atmosphere at a concentration above 15 ppm. Exhaust, detection, <br />and treatment systems also require connection to a source of emergency power, <br />MEMO -- CITY FACILITIES <br />p. 4 <br />