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A=COM 4.16.2 Rod box changes present severe crushing hazards. Operators shall ensure all crew members are clear of the machine and hoisting equipment while they are changing rod boxes. 4.17 Rotary, Sonic and Core Drilling 4.17.1 In addition to the health and safety procedures identified above,the following general health and safety procedures should be followed when supervising borings with rotary, sonic and core drilling: • Drill rods should not be braked during lowering into the hole with drill rod chuck jaws. Drill rods should not be held or lowered into the hole with pipe wrenches. • If a string of drill rods are accidentally or inadvertently released into the hole, do not attempt to grab the falling rods with your hands or a wrench. • When drill rods are hoisted from the hole,they should be cleaned for safe handling with a rubber or other suitable rod wiper. Do not use hands to clean drilling fluids from drill rods. • When drill rods are rotating, stay clear of the rotating components of the drill rig. Never reach behind or around a rotating drill rod for any reason. • Use a long-handled shovel to move cuttings away from the top of the borehole. Never use hands or feet to move cuttings away from the borehole. • If work shall progress over a portable drilling fluid (mud)pit, do not attempt to stand on narrow sides or cross members.The mud pit should be equipped with rough-surfaced,fitted cover panels of adequate strength to hold drill rig personnel. • Keep away from area where drill rods are being moved or raised to the rig. Do not stand in the area where a drill rod will fall or slide if it should be dropped. • Loud noises may occur during drilling. Hearing protection shall be worn. 4.18 Direct-push 4.18.1 The following general health and safety procedures should be followed when supervising drilling borings with direct-push drilling: • Loud noise may occur during direct-push drilling. Appropriate hearing protection shall be worn. • When drill rods are hoisted from the hole,they should be cleaned for safe handling with a suitable rod wiper. Do not use hands to clean drilling fluids from drill rods. • If work shall progress over a portable drilling fluid (mud)pit, do not attempt to stand on narrow sides or cross members.The mud pit should be equipped with rough-surfaced,fitted cover panels of adequate strength to hold drill rig personnel. • Drill rods should not be lifted and leaned unsecured against the mast. Either provide some method of securing the upper ends of the drill rod sections for safe vertical storage or lay the rods down. 4.19 Horizontal Directional Drilling 4.19.1 During surface to surface operations a 16.4' (5 meters)safe zone shall be established and identified at both the entry and exit locations; no personnel are permitted to be within this zone unless the drill is locked out and the operator is out of the seat. 4.19.2 Machine shall be locked out before entering an excavation, changing tools, adding or removing drill stem or doing any other work on tools or the drill stem at the exit end of the bore. 4.19.3 A tracking head shall be installed on the drill stem: 4.19.4 Assemble drill head using components appropriate to the soil conditions to be encountered (e.g. nozzle, bit, beacon housing, etc.). 4.19.5 Ensure all personnel are clear of the bore entry point(outside of identified work zone). 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 9 of 12