The work included construction of a steel-framed platform with a metal bar grating walking surface to an existing mechanical unit in Hanger 131; construction of a steel ladder for access to an existing steel framed platform in Hanger 250; & demolition of an existing wood-framed elevated platform & replacement with a new steel-framed elevated platform, consisting of structural steel beam & tube columns, new steel-framed stairs and landing, and new concrete foundations in OU-1.