Abstract: On December 11, 2010 in Riverdale, CA, Employee #1, a driller's assistant, was injured when his shirt became entangled in water well drilling rig's pump drive shaft. This caused him to be thrown against the truck. During the Division of Occupational Safety and Health (DOSH) investigation, Employee #1 alleged that he received a report that the water pump gland packing was leaking. Employee #1 allegedly used an open end wrench to tighten the packing. Employee #1 asserted he was wearing thermal underwear under a short sleeved T-shirt. Employee #1 allegedly reached toward the packing, and his right bicep contacted the pump's rotating drive shaft. Employee #1's shirt became entangled in the shaft. The employer had a well devised safety program, including a policy to shut down the rig when any adjustments, maintenance or repairs were required. Employee #1's eighth rib on the left side of his rib cage was fractured, and Employee #1 suffered pulmonary contusion and abrasions on his upper torso. Employee #1 was hospitalized for less than 24 hours, and his injuries were not considered serious or life threatening. On December 13, 2010, the Big River Drilling's insurance agent notified DOSH of the injury. The DOSH drilling rig inspection raised questions as to why Employee #1 came into contact with the rotating shaft, since the gland packing adjusting nuts were easily accessible. The drive shaft was accessible with some difficulty. Employee #1's injury would require climbing on to the pump and working over the top, rather than standing on the ground. Employee#1's employer received consideration for penalty and classification for violation of requirements related to the employer's Injury and Illness Prevention Program, lack of body protection and guarding of moving parts of machinery/equipment.