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Mud Rotary Drilling Field Standard Operating Procedure SWE-FSOP-304;Revision 0 Ahtna Southwest Environmental Operations • As per the site health and safety plan, appropriate barriers and markers should be in place before drilling. • Plastic sheeting (e.g., VisqueenT"^) may be required beneath the rig. • Appropriate cuttings and other IDW containment should be set onsite before drilling. 4.2.2 Discussion of Site Conditions Before drilling operations begin, the following must be completed: • The FTL or Field Geologist should assess the drilling site with the driller. This assessment should identify potential hazards and determine how drilling operations may impact the environment. • Potential hazards should be evaluated and corrected,or the borehole location changed or shifted. • The FTL or PL should inform the driller of the appropriate equipment (e.g., cookie-cutter, etc.)to penetrate the surface cover (e.g., asphalt, concrete, cement, etc.). • If a shallow subsurface hazard (i.e., unidentifiable utility or trapped vapors) may exist, the driller should be informed of the potential hazard before breaking ground. Drilling should then commence slowly to allow continuous visual inspection and monitoring, if necessary, stop for probing. 4.2.3 Mobilization Once the site is prepared, the rig is mobilized and located over the borehole. • The drill rig is mobilized to the site and located over the borehole. • The drill rig is leveled with a set of hydraulic pads attached to the front and rear of the drill rig. • The driller should always raise the mast slowly and carefully to prevent tipping or to damage the rig and avoid obstructions or hazards. • As per the site health and safety plan, appropriate barriers and markers should be placed before drilling. 4.3 Drilling Procedures Hand auger, shovel, or air knife the borehole location to the maximum expected depth of any utilities (commonly S feet or greater) before drilling. The driller should be informed of any known shallow subsurface hazards (unidentifiable utility, trapped vapors, etc.). Drilling the surface hole should commence slowly to allow continuous visual inspection and, if necessary, any interruptions for probing until the anticipated maximum depth of any suspected obstructions is exceeded. Before beginning drilling, the drilling fluid or mud should be "made up" in the mud pits. The drilling mud properties (as specified in the project work plans) should then be verified to the satisfaction of the Field Geologist before allowing drilling to proceed.These observations should also be documented by the site Field Geologist on the Field Activity Daily Log. 4.3.1 Borehole Drilling During drilling operations, and as the borehole is advanced, the Field Geologist will generally: • Observe and monitor rig operations • Conduct health and safety monitoring and sampling, as applicable, and supervise health and safety compliance Page 8 of 11