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12. OxvQen De6cient Atmosahere <br />a. An atmosphere containing less than 19.5 percent oxygen. <br />13. Oxyg,,en Enriched Atmosphere <br />a. An atmosphere containing more than 23.5 percent oxygen. <br />14. Retrieval Line <br />a. A line or rope secured at one end to the worker by a full body harness and <br />with its other end secured to either a lifting device or to an anchor point <br />located outside the entry portal. <br />II. Reason for Entering Permit Required Confined Space. <br />A Maintenance and Repair <br />B. Inspection <br />C. Sampling <br />D. Investigation <br />E. Other project related to proper operation of treatment plants and/or collection system <br />F. Emergency Rescue <br />III. Permit Required Confined Svace Program <br />A Where required, the ZT]Iufihall prepare a pernut(s) in a standardized format (or <br />preprinted), through which the V]]agtdentifies all parameters which must be evaluated <br />and all conditions that must be met to ensure safe entry. <br />B. Persons who intend to authorize entry into a pernut space shall include the following <br />information in the checklist portion of a permit: <br />1. The Hazards of the permit space, including: <br />a. Chemical Hazards (hazardous atmosphece) <br />1) Flammable liquid - flash point below 100 degrees F. (Example: gasoline) <br />2) Combustible liquid - flash point at or above 100 degrees F. (Example: <br />kerosene) <br />3) Oxygen enriched over 23.5% <br />9.