Rescue crews recovered the man's body Tuesday afternoon.
Forsyth County Fire Capt. Jason Shivers said the 20-year-old man was buried under dirt in the trench on Trammel Road near Buford Highway.
Shivers said rescuers were called to the scene around 2:40 p.m. They cleared his head and shoulders, but just before 4 p.m. discovered that he did not survive.