James J. Bell, of Glenshaw, Pa., admitted to conspiring with others to alter wastewater samples from the uniform company´s laundry. The samples either were tampered with to yield false results or taken from sampling locations not authorized by the company’s wastewater discharge permit.

The laundry monthly discharges about 1 million gallons of wastewater, which contains benzene, toluene and oil. Bell faces a maximum sentence of five years in prison and a fine of $250,000.