On 8/17 EE fell to ground while boarding truck. Slight pain in back, dr gave him dose of pain med, released to work. On 8/28 he told his supervisor he'd hit pothole previous day, aggravating back. Went to dr, given full release. Worked reg. schedule till 9/11, called off w/back pain. On 9/12 notified supervisor dr had taken him of work for 30 days.