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A=COM 4.19.6 At all times two way communication will be maintained at entrance and exit points using two way radios or equally effective communication means. If at any time communication is lost, all work will be stopped until communication is re-established 4.19.7 Locate drill head with tracking device at least every half-length of pipe.Adjust direction as necessary to follow the intended bore path. 4.19.8 Any drilling fluid returning to the surface shall be cleaned up promptly. 4.19.9 Drill pipe should exit the bore at an angle of 5 to 10'from the ground surface. 4.19.10 Turn off fluid flow as soon as drill head emerges. 4.19.11 Lockout machine and remove drill head using appropriate breakout tools. 4.19.12 Select and attach a reamer that allows the return of drilling fluids and cuttings,to reduce frictional pullback forces, and to allow for bend radius of the pipe. Reamer shall be: • The smaller of 1.5 times the outside diameter(O.D.)or 12 inches(300mm) larger than the diameter of the product pipe. • A diameter less than 1.5 times the diameter of the product may be necessary in collapsing soil formations. • Reamed diameter may need to be increased by up to 25% if substantial swelling of the soil is expected to occur. 4.19.13 All personnel shall clear the trench or the designated surface zone(16.4 feet[5 meters])once the reamer is attached. Operator shall only reverse lockout and commence pullback when communication is received from personnel on exit hole side and operator has confirmed the message. 4.19.14 Personnel on exit hole side shall ensure reamer is pulled the entire way back to the exit hole. • If rotation is started when drill rod and reamer are away from the exit hole, very fast sideways movement of the rod and reamer can occur. • Larger reamers and longer lengths of exposed drill rod increase the speed and distance of this movement. 4.19.15 If working with trailing drill stem, swivels shall be verified as lubricated and rotating freely by hand prior to use: • A freely moving swivel prevents trailing drill stem or product from rotating/whipping. • If the swivel does not move freely by hand it shall be removed from service and repaired or replaced. • Only use swivels with limited articulation to prevent whipping or cranking action between the reamer and trailing drill pipe or product. 4.19.16 It is important to clean and lubricate the tool and drill stem joint threads before each use. 4.19.17 Any individual drill pipes that are bent or damaged shall be immediately taken out of service. 4.19.18 Occasionally change the order of the lead drill pipe(i.e. move the lead pipe to the end of the stem, or other pipe rotation procedures)to extend drill stem life. 4.19.19 Operator should avoid stalling the pipe rotation to avoid stress damage from shock loading. 4.20 Drilling at Potential MEC/LIXO Sites 4.20.1 If the project site is suspected of containing munitions and explosives of concern (MEC)or unexploded ordnance(UXO),the LIXO team will conduct a reconnaissance and MEC/UXO avoidance to provide clear access routes to each site before drilling crews enter the area. The following procedures will be implemented: 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 10 of 12