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SOP-006 Standard Operating Procedure Mud Rotary Drilling Page 3 of 5 REVISION NO. 0 March 2020 Sharpe Army Depot indicated by fast or slow drilling), rotation speeds, chattering and bucking of the rig, lost returns, lost circulation zones, hard or sticky drilling, drilling refusal, etc. These conditions, including penetration rates, should be recorded on the boring log. Drilling should not be allowed to progress faster than the site geologist/engineer can adequately observe conditions, compile cuttings logs, and supervise safety and sampling activities. The site geologist/engineer should also observe the make-up and tightening of connections as additional pipe joints are added to the drill string. Any observed problems and causes, including significant downtime, should be recorded. Cutting and fluid containment during drilling should be observed and supervised by the site geologist/engineer as per specifications in the project work plans. The mud circulation system should be inspected periodically for leaks. The site geologist/engineer will continue to oversee or conduct appropriate health and safety sampling and monitoring during drilling. If any potentially unsafe conditions are evident from drilling observations or health and safety monitoring, the site geologist/engineer may suspend drilling operations at any time and take appropriate actions as per the health and safety plan. In the event of a suspension of drilling activities: • Project Task Leader must be informed of the situation • Appropriate corrective action must be implemented before drilling may continue • The observed problem, suspension, and corrective action must be entered on the field daily log During drilling, the site geologist/engineer will compile a boring log. The boring log may include, as applicable: • The borehole location • The name of the drilling company and drilling team • The dates and times of drilling events including when drilling began, the total depth and when it was reached, intermediate milestones (additional casing, geophysical logs, etc.) and any changes in equipment (bits, drill pipe, tools, etc.) • Weight, viscosity, yield point, and additives • Relative drilling rate and presence of drill chatter. These parameters may confirm lithologic boundaries • Lithologic data from cuttings, core or soil samples including depths, frequency, and quality • Intermediate sampling points for core or soil samples • Premature total depth due to refusal and the cause of refusal • Any other observed drilling conditions The site geologist/engineer will also enter pertinent drilling information on the field daily log (SOP-002). This includes but is not limited to the following: • The dates and times of drilling events including when drilling began, the total depth and when it was reached, intermediate milestones (i.e., additional casing, geophysical logs, etc.) and any changes in equipment (i.e., bits, drill pipe, tools, etc.) • The dates, times and causes of any significant downtime