EE was washing down some material when a rock, approximately 12"" x 8"", slid into the EE's left foot. At the time, the EE said it was fine. On 9/14/2011, the EE complained of pain in his foot, he went to the doctor and the doctor said he had a bruise. The doctor told him to prop his foot up occasionally while at work, restricting his duty, thereby making the incident reportable.