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Mud Rotary Drilling Field Standard Operating Procedure SWE-FSOP-304;Revision 0 Ahtna Southwest Environmental Operations • Establishing clear communication signals with the drilling crew is mandatory since verbal signals may not be heard during the drilling process. The entire crew should be made aware to inform the Field Geologist of any unforeseen hazard—or when anyone is approaching the exclusion zone. 4.1.3 Site Conditions, Drilling Logistics, and Equipment Prepare the site per the project work plans. Before mobilizing, determine the logistics of drilling, logging, sampling, cuttings/fluid containment, and well construction. Before mobilization, the FTL or the Field Geologist should assess the drilling site with the driller. This assessment should identify potential hazards(i.e.,slip/trip/fall,overhead power lines)and determine how drilling operations may impact the environment (i.e., dust, debris, noise). As per the project work plans, potential hazards should be evaluated and corrected, or the borehole location changed or shifted. • Drill site space requirements commonly include an area for the rig and swing-out clearance for the cyclone, access for a pipe truck, and forklift carrying the pipe or debris bins. • Appropriate cuttings and other investigation-derived waste (IDW) containment should be set onsite before drilling. • The FTL orthe Field Geologist should inform the driller of the appropriate equipment(e.g.,cookie- cutter, etc.)to penetrate the surface cover(e.g., asphalt, concrete, cement, etc.). • The lubricating compound used on drill pipe and drive casing threads must be approved in advance and must not contain any incompatible compounds with project objectives, laboratory analyses, or water quality guidelines. 4.1.4 Rig Decontamination and Preparation • All drilling and sampling equipment should be decontaminated before drilling. • The drilling equipment shall be inspected for proper maintenance and appropriate decontamination before each time the rig is mobilized to a site. • All clutches, brakes, and drive heads should be properly working. • All cables and hydraulic hoses should be in good condition. • Any observed leakage of fluids from the rig should be immediately repaired and the rig decontaminated again before it is allowed to mobilize. 4.1.5 Calibration Before mobilization, calibrate safety sampling and monitoring equipment per the project work plans. 4.1.6 Personal Protective Equipment (PPE) Don the appropriate PPE specified in the project work plans and APP. 4.2 Mobilization and Setup The standard procedure for mud rotary drilling is described below.Conduct drilling following this SOP and the project work plans. 4.2.1 Site Preparation Prepare the site per the project work plans. Before mobilizing, determine the logistics of drilling, logging, sampling, cuttings/fluid containment, and well construction. Page 7 of 11