The Dubois library has an upper mechanical room and a basement mechanical room. The architectural plans show the floor elevation of the upper mechanical room to be 518' - 7 ½". The basement room has a floor elevation of 213' - 0 ½" . (elevations above sea level in feet and inches). 1. For a pump in the basement which must deliver water to a bucket on the floor of the upper mechanical room, what is the minimum pressure in psig you will see at the pump discharge.