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Clayton ENVIRONMENTAL CONSULTANTS • When making repairs or adjustments to a drill rig or to lubricate fittings, shut down the drill rig. Take precautions to prevent accidental starting of an engine during maintenance by removing or tagging the ignition key. • Always block the wheels or lower the leveling jacks or both and set hand brakes before working under a drill rig. • All nonessential personnel not directly involved in the drilling operation shall stand in the support zone. • All drill crew members must wear hard hat, safety glasses, steel toe boots, long pants, short-sleeved shirts, and hand protective gloves. • Make sure all gear boxes are in neutral, all hoist levers are disengaged, all hydraulic levers are in the correct nonactuating positions and the cathead rope is not on the cathead before starting a drill rig engine. • Do not drive the drill rig from hole to hole with the mast (derrick) in the raised position. • Before raising the mast(derrick) look up to check for overhead obstructions. • Before the mast (derrick) of a drill rig is raised and drilling is commenced, the drill rig must first leveled and stabilized with leveling jacks and/or solid cribbings. Lower the mast (derrick) only when the leveling jacks are down and do not raise the leveling jack pads until the mast (derrick) is lowered completely. • Loose tools and similar items should not be left on the derrick platform or on structural members of the derrick. 9.0 FLAMMABILITY AND COMBUSTIBILITY HAZARD Flammable or combustible vapors are likely to be present in the work area. The concentration of vapors in excavations, or work areas may reach the flammable (explosive) range. Precautions must be taken to: (1) eliminate all potential sources of ignition from the area (for example, smoking materials, nonexplosion-proof electrical, and internal combustion equipment) and (2) prevent the accumulation of vapors at ground level. Fire extinguisher (2A:10B:C) will be located on heavy equipment and in chemical use and storage areas. An explosion hazard shall be assumed to exist where chemical concentrations in air exceed their respective lower explosive limits (LEL). All open flame and spark- producing equipment within the vapor hazard area will be shut down. The SSO will use the GasTech Hydrocarbon Surveyoil or an equivalent model to measure concentration of combustible gas or vapor in air simultaneously with measurement of oxygen and detection of oxygen deficiency. An alarm will sound and all work must stop if the meters read any of the following: (1) 10% LEL, (2) 200 ppm, (3) 19.5% oxygen level (falling), or (4) 25% oxygen level (rising). 7 ENG147 2-%HSP