The Buffalo County SHeriff's Department says a Rochester man was injured when the sand truck he was driving overturned Thursday just before noon.
                    
Authorities said Randy Ziemann was westbound on county trunk 'P' in the Town of Buffalo when he lost control on a curve and the semi rolled over trapping him inside.  He was extricated by the Fountain City Fire Department and airlifted to a hospital by the Medlink helicopter with non life-threatening injuries.
               
They said speed was a factor in the crash.