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Groundwater Well Installation Standard Operating Procedure SWE-FSOP-601;Revision 1 Ahtna Southwest Environmental Operations 4.1.4 Rig Decontamination and Preparation • All drilling and sampling equipment should be decontaminated before drilling per SWE-FSOP- 801. "Equipment Decontamination" • 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 decontaminated again before it is allowed to mobilize 4.1.5 Calibrations Before mobilization, calibrate the safety-related sampling and monitoring equipment. 4.1.6 Personal Protective Equipment (PPE) Provide workers with the appropriate PPE as specified by the project work plans. 4.2 Mobilization and Set-Up The standard procedure for installing groundwater wells is described below, and the project work plans may include additional specifications. 4.2.1 Site Preparation The logistics of drilling, cuttings/fluid containment, and well construction should be determined before mobilizing.The site should be prepared as per the project work plans. • As per the site health and safety plan, appropriate barriers and markers should be in place before drilling • Plastic sheeting (e.g.,VisqueenTM) may be required beneath the rig • Appropriate cuttings and other IDW containment should be set onsite before the commencement of drilling • If drilling is conducted in the saturated zone, provisions should be made to ensure adequate containment of formation water produced during drilling operations • Clear the work site of all brush and minor obstructions and then mobilize the rig to the monitoring well location 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. • As per the project work plans, potential hazards should be evaluated and corrected, or the borehole location changed or shifted. • 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 and, if necessary, stop for probing. Page 9 of 16