Job Description:

• 1) Operates drilling unit, mounted on truck or crawler track, to drill holes for concrete pier and footing foundations: Raises and lowers boom to specified angle for drilling.

• 2) Swings boom, controls hoist drums, raises and lowers drill, hoists drill bit, bell reamer, casing, and reinforcement steel into position, and controls rotary table that drives drill into earth.

• 3) Observes drill stem during drilling operation and increases or decreases brake pressure on drill stem hoist drum to prevent swaying motion.

• 4) Raises drill stem and swings boom to discharge dirt from drill bit or bell reamer.

• 5) Observes type of earth formation penetrated to determine need for lowering casing into hole to seal off water and prevent cave-in of soft formations.