Released back to work with a ""sitting only"" restriction. Tem 8F. Pit excavator drove fuel truck to machine in pit bottom & park the truck. Exited to chock the rear wheels. EE's right foot slipped on an ice puddle EE caught EE's full weight on EE's left foot. EE experienced pain in EE's ankle. RMH/Sentara Corp health determined EE's injury to be Achilles Tendon Entesopathy.