The approach in the Confined Spaces Rule sharply contrasts with more stringent, recently promulgatedOSHA standards, such as those for confined spaces in shipyard employment [29 CFR 1915, Subpart B],which limit work activities that can be conducted in atmospheres that exceed 10 percent of the LEL. Theshipyard standard requires that confined spaces containing a flammable concentration of 10 percent of the LEL or higher be labeled as ―Not Safe for Workers‖ [29 CFR 1915.12(b)(2)]. In the discussion related tothe final rule for confined spaces in shipyard employment, OSHA argued that adopting 10 percent of theLEL limit for safe occupancy was more appropriate than other proposed levels: ―The Agency believesthat a compartment in which any portion is above 10% of the LEL is unsafe‖ [59 FR 37816-37863].