Employee was hauling mud on Volvo truck when he went across ruts in road and jerked the cab of the truck hurting his lower back. Employee didn't tell foreman until next day 7/29/11 and did not go to ER until 7/30/11 and is not going to his regular doctor until 8/1/11, he then came back to work on 8/3/11 and left early to go back to the ER with back pain.