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' for, at a minimum, oxygen content, flammability, and <br /> toxic contaminants . <br /> ' Mechanical ventilation, as appropriate, will be <br /> provided. <br /> ' The "Inspections and Tests for Entry Into Confined <br /> Spaces" form must be completed and posted prior to <br /> entering the space. <br /> ' Supplied air respirators shall be required for <br /> confined space entry if preentry atmospheric testing <br /> indicates contaminant concentrations greater than two <br /> ' times the TLV. <br /> • Entry shall be made while wearing a lifeline and <br /> ' harness that is manned by a standby person. <br /> SANITATION <br /> Potable Water <br /> ' An adequate supply of potable water shall be provided <br /> at the work site. <br /> • Portable containers used to dispense drinking water <br /> shall be capable of being tightly closed, and equipped <br /> with a tap. Water shall not be dipped from the <br /> container. <br /> • Containers used to distribute drinking water shall be <br /> ' clearly marked and not used for any other purpose. <br /> • Single service cups (to be used but once) will be <br /> supplied; both a sanitary container for the unused <br /> ' cups and a receptacle for disposing of the used cups <br /> shall be provided. <br /> Nonpotable Water <br /> • Outlets for nonpotable water shall be identified to <br /> clearly indicate that the water is unsafe and is not <br /> to be used for drinking, washing, or cooking purposes . <br /> • There shall be no cross connection (open or potential) <br /> between potable and nonpotable water systems . <br /> Nonpotable and potable water outlets shall be <br /> physically separated so as to minimize confusion and <br /> possible cross contamination. <br /> A-28 <br /> MA:ENG:9262-APPA/091291 <br />