Job Description:

• 1) Operates portable rotary drilling rig to drill shallow boreholes to obtain samples of earth formations, for placement of explosives in seismic prospecting, or for other tests to discover petroleum: Positions truck-mounted derrick at drilling area specified on field map.

• 2) Starts rig and moves throttles and clutches to raise and lower drilling pipes.

• 3) Counts sections of drill rod to determine depth of borehole.

• 4) Selects coring bit and barrel.

• 5) Withdraws core barrel from hole and extracts core from barrel.

• 6) Records depths at which samples were taken.

• 7) Repairs equipment, using handtools.