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Mud Rotary Drilling Field Standard Operating Procedure SWE-FSOP-304;Revision 0 Ahtna Southwest Environmental Operations • Prepare a lithologic log from cuttings, core, or soil samples • Document drilling progress and other appropriate observations • Supervise the collection and preparation of any soil, soil vapor, or groundwater samples • For specific soil and groundwater sampling procedures, refer to the project-specific work plans and appropriate FSOP. 4.3.2 Ongoing Monitoring The field geologist should observe and frequently communicate with the driller regarding drilling conditions as drilling progresses.This includes relative penetration rates(indicative of fast or slow drilling), chattering or bucking of the rig, lost circulation zones, hard or sticky drilling, drilling refusal, etc. • The Field Geologist oversees or conducts appropriate health and safety sampling and monitoring. • The conditions described above, including the relative drilling rate, should be recorded on the boring log. • The Field Geologist should know the total depth of the borehole during drilling. • Drilling should not be allowed to progress faster than the Field Geologist can adequately observe conditions, compile boring logs, and supervise safety and sampling activities. • The Field Geologist should also observe the rig operations, including the make-up and tightening of connections and any observed leaks. • During drilling,track and note changes in the drilling process(e.g.,sounds,rotation speed,sudden drops, etc.) that may indicate changes in lithology, material density, etc., and collect representative soil samples as required by the project work plans. • Any observed problems that include significant downtime and their causes are recorded in the FLB/notepad or field form. • Cuttings and fluids containment during drilling should be observed and supervised by the rig geologist/engineer, as per specifications in the project work plans. If any potentially unsafe conditions are evident during the above drilling observations,the Field Geologist (or any onsite person) may suspend drilling operations and take appropriate actions per the health and safety plan. In the event suspension of drilling activities occur: • The FTL and Safety Representative must be informed of the situation. • Appropriate actions must be implemented before drilling may be continued. • The problem, suspension, and actions taken are entered on the FLB/notepad or field form. 4.3.3 Boring Log The Field Geologist compiles a boring log during drilling, preferably from recovered, undisturbed soil samples. Use field form SWE-FFRM-400. Logs should only be compiled from cuttings if there is no other option. Soil classification descriptions included in the boring log show follow procedures in the soil classification FSOP in Section 2.0. Subsurface soil samples may be collected with a split spoon sampler, Shelby tube, wireline sampler, or other compatible devices during drilling.This usually requires tripping out(removing)the inner rotary drill Page 9 of 11