| http://www.w3.org/ns/prov#value | - Confined or enclosed spaces include, but are not limited to, storage tanks, process vessels, bins, boilers, ventilation or exhaust ducts, sewers, underground utility vaults, tunnels, pipelines and open top spaces more than 4 feet deep, such as pits, tubs, vaults, and vessels. [1926.21(b)(6)( i ) and ( ii )]
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