Forklifts will be operated only on finished ground (i.e., concrete, asphalt, macadam or similar finishing material), with adequate skid resistant properties, with the following exceptions:
a. if the manufacturer’s specification for the equipment provides for operation on unfinished ground; or
b. if there is a unique need to operate the equipment on unfinished ground and a written risk assessment had been completed in writing and signed by the site manager.