This 1A21 checklist supports safe, consistent borehole geophysical survey work. It guides teams through site safety preparation, signage, PPE, spill response, and equipment readiness. It covers borehole collar inspection and dummy runs, depth counter alignment and zeroing, and winch setup, securing, and shielding. Probe procedures include station timing, knots and safety lines, thread and ring checks, taping connections, lubrication, and sky visibility. End-of-day actions and dummy probe steps help verify equipment condition and capture records.
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