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A=COM • Before raising the mast(derrick), all rig personnel (with the exception of the operator)and visitors should be cleared from the areas immediately to the rear and the sides of the mast.All rig personnel and visitors should be informed that the mast is being raised prior to raising it. • Before the mast(derrick)of a drill rig is raised and drilling is commenced,the drill rig shall be first levelled and stabilized with levelling jacks and/or solid cribbing. o The drill rig shall be releveled if it settles after initial set up. o Lower the mast(derrick)only when the levelling jacks are down, and do not raise the levelling jack pads until the mast(derrick)is lowered completely. • After the rig has been positioned to begin drilling, all brakes and/or locks shall be set before drilling begins. • The operator of a rig shall only operate a drill rig from the position of the controls. The rig shall not be in operation if the operator of the rig leaves the area of the controls. • Throwing or dropping tools shall not be permitted.All tools shall be carefully passed by hand between personnel or a hoist line should be used. • If it is necessary to operate the rig within an enclosed area, make certain that exhaust fumes are conducted out of the area. o Exhaust fumes can be toxic and some cannot be detected by smell. o Air monitoring and, as necessary, noise monitoring shall be conducted. • Clean mud and grease from boots before mounting a rig platform and use hand holds and railings. Watch for slippery ground when dismounting from the platform. • During freezing weather, do not touch any metal parts of the rig with exposed flesh. Freezing of moist skin to metal can occur almost instantaneously. • All unattended bore holes shall be adequately covered or otherwise protected to prevent rig personnel, site visitors, or animals from stepping or falling into the hole.All open bore holes shall be covered, protected, or backfilled adequately and according to Federal/State/ Provincial/Territorial or local regulations on completion of the drilling project. • When using a ladder on a rig,face the ladder and grasp either the side rails or the rungs with both hands while ascending and descending.Always use adequate fall protection and a full body harness when climbing above 6 feet(1.8 meters)of the ground. Do not attempt to use one or both hands to carry a tool while on a ladder. Use a hoist line and a tool"bucket'or a safety hook to raise or lower hand tools. 4.12 Drilling Fluid 4.12.1 Ensure drilling fluid is appropriate to the soil type and conditions to be encountered to enable smooth drilling. 4.12.2 Drilling fluid used in the boring process shall be contained at the entry and, as applicable, exit locations until recycled or removed from the site. 4.12.3 Confirm drilling fluid does not enter roadways, streams, municipal storm or sanitary sewer lines, and/or any other drainage system or body of water. 4.12.4 Monitor drilling equipment and fluid equipment for any leakage or spills. Confirm appropriate containment is in place and adequate spill response supplies are available. 4.12.5 It is important to monitor fluid flow and pressure gauges when drilling with any tooling, but it is essential when drilling with a mud motor(pump placed in the drill string to provide additional power to the bit while drilling). 4.13 Unanticipated Concrete/Debris or Void 4.13.1 The presence of subsurface installations and utilities requires special care when obstructions/ refusal and voids are encountered and when unexpected absence of soil recovery occurs during Drilling,Boring,&Direct Push Probing(S3AM-321-PR1) Revision 2 July 31,2019 PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. Page 7 of 12