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Sonic Drilling Field Standard Operating Procedure <br /> SWE-FSOP-302;Revision 0 Ahtna Southwest Environmental Operations <br /> • The drilling equipment shall be inspected for proper maintenance and appropriate <br /> decontamination before each time the rig is mobilized to a site <br /> • All clutches, brakes, and drive heads should be properly working <br /> • All cables and hydraulic hoses should be in good condition <br /> • Any observed leakage of fluids from the rig should be immediately repaired and <br /> decontaminated again before it is allowed to mobilize <br /> 4.1.5 Calibration <br /> Before mobilization, calibrate the safety-related sampling and monitoring equipment. <br /> 4.1.6 Personal Protective Equipment (PPE) <br /> Don the appropriate PPE as specified in the project work plans and APP. <br /> 4.2 Mobilization and Setup <br /> The standard procedure for sonic drilling is described below and the project work plans may include <br /> additional specifications. <br /> 4.2.1 Site Preparation <br /> The logistics of drilling, logging, sampling, cuttings/fluid containment, and well construction should be <br /> determined before mobilizing.The site should be prepared as per the project work plans. <br /> • As per the site health and safety plan, appropriate barriers and markers should be in place before <br /> drilling <br /> • Plastic sheeting (e.g., Visqueen'') may be required beneath the rig <br /> • Appropriate cuttings and other IDW containment should be set onsite before the commencement <br /> of drilling <br /> • If drilling is conducted in the saturated zone, provisions should be made to ensure adequate <br /> containment of formation water produced during drilling operations <br /> 4.2.2 Discussion of Site Conditions <br /> Before drilling operations begin, the following must be completed: <br /> • The FTL or Field Geologist should assess the drilling site with the driller.This assessment should <br /> identify potential hazards and determine how drilling operations may impact the environment. <br /> • As per the project work plans, potential hazards should be evaluated and corrected, or the <br /> borehole location changed or shifted. <br /> • If a shallow subsurface hazard (i.e., unidentifiable utility or trapped vapors) may exist,the driller <br /> should be informed of the potential hazard before breaking ground. Drilling should then <br /> commence slowly to allow continuous visual inspection and monitoring and, if necessary,stop for <br /> probing. <br /> Page 8 of 11 <br />