This rule revises OSHA''s Safety Standards for Lift Slab Construction Operations. This rulemaking updates specific requirements for lift-slab construction operations that were incorporated by reference in the existing ANSI standard (A10.9-1970), and adds new requirements to provide additional protection for workers engaged in lift-slab construction operations. This revision eliminates ambiguities caused by incorporating the ANSI standard by reference and strengthens the lift-slab requirements by eliminating weaknesses or gaps in coverage that existed through the reference to the outdated ANSI standard. Effective Date: 12/17/90. CONTACT: James Foster (202)523-8151.