Abstract: At approximately 6:30 a.m. on September 25, 2009, an employee was found in the women's. He had been cleaning the floor edges and base boards of the bathroom with a gasoline-powered John Deere pressure washer, Model Number. 020382, which contained water. The pressure washer was still running when the employee was found. It was discovered that the employee was exposed to carbon monoxide during a 37-minute exposure at a mean level calculated carbon monoxide to be 1928.6 parts per million The calculated eight-hour Time Weighted Average for carbon monoxide was 148.7 ppm which was 2.97 times the OSHA Permissible Exposure Level of 50 ppm CO.