EE informed MGT of back pain on 2/12/2013. EE had been running a skidsteer loader/water truck-did not see physician until 2/15/2013, an MRI was scheduled for diagnosis. 2/21/2013 Phys.diag. was a bulging/ruptured disk in lower back-placed on light/sedentary duty. Item being treated as work related unless/until directed otherwise by phys.