Concerned about the dangers of fire he cautioned his workers regarding the danger of fire to: "take care that no Fires be made by the Carpenters and others attached to them to Bend their planks but at such places as may be deemed to be most proper for that careful purpose, and he is charged to see them all extinguished by Sunset." Fox even went as far as to urge his employees to remember and care for their environment and to avoid throwing debris in the Potomac and Anacostia Rivers. He urged his men: "When working afloat he is not on any authority whatever to throw over board into the River any Stage Plank & Spalls, or other useful materials, neither is he to throw any rotten stuff that will sink to the injury of the river."