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Sonic Drilling Field Standard Operating Procedure SWE-FSOP-302;Revision 0 Ahtna Southwest Environmental Operations • Review available forms and diagrams that document the selected location of the drilling location relative to underground/overhead utility lines, surface structures, or buried objects. • Copies of the site clearance documents should be kept onsite. 4.1.2 Health and Safety • Hold Tailgate Safety Meetings in the manner and frequency stated in the health and safety plan. • All personnel at the site should have appropriate training and qualifications as per the health and safety plan. • All personnel within the exclusion zone should pay close attention to rig operations during drilling. The rotating or swinging drilling components can snag or catch loose clothing or strike personnel and cause severe injury or death. • Hearing protection is especially critical when sonic drilling, as the rig can generate high- frequency noise and considerable noise when drilling through gravel and cobbles. • 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 driller of any unforeseen hazard—or when anyone is approaching the exclusion zone. 4.1.3 Site Conditions and Drilling Logistics Prepare the site per the project work plans. Before mobilizing, determine the logistics of drilling, logging, sampling, cuttings/fluid containment, and well construction.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 clearances, access for a pipe truck, and forklift carrying pipe or debris bins. • The FTL or the 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.). • Lubricating compounds used on drill pipe and drive casing threads must be approved in advance and must not contain compounds incompatible with project objectives, laboratory analyses, or water quality guidelines. • Drive casings of various lengths should be provided by the subcontractor to facilitate emplacement of the sand pack, bentonite seal, and grout during well construction. One 3-foot, two 5-foot, and two 10-foot lengths and enough standard-length drive casing joints are recommended. • A hydraulic casing extractor must be used to remove the drive casing from the borehole. Do not extract the casing by "hammering up" with the casing hammer. The hydraulic casing extractor should have sufficient pulling capacity and clamping mechanisms to extract the casing safely and smoothly with the appropriate lifting force. 4.1.4 Rig Decontamination and Preparation • All drilling and sampling equipment should be decontaminated before drilling Page 7 of 11