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4 . IF WORKING ON TOP OF A TANK(S) IN AN UNPROTECTED HOLE WITH MORE THAN FOUR FEET OF DEPTH ON BOTH SIDES OF THE WORKER, ( INSERTING DRY ICE, ATTACHING/DETACHING SHACKLES , RINSING TANKS, ETC. ) WORKERS MUST BE HARNESSED TO A TEATHER LINE OR A STABLE OBJECT OVER THE HOLE . 5 . TEATHER LINES MUST BE NO SMALLER THAN 5/8" ROPE (NYLON) WITH A MINIMUM TENSILE STRENGTH OF 5400 LBS, INCLUDING ALL HARDWARE. THE TEATHER ROPE MUST BE ATTACHED ON EACH END TO A STATIONERY OBJECT, SUCH AS A BUILDING OR VEHICLE. IF NOT FEASIBLE, USE 2 " GALVANIZED PIPE AND BURY AT LEAST 2 FEET IN DEPTH ON EACH SIDE OF THE EXCAVATION. THEN ATTACH A CHAIN FROM THE POSTS TO A STABLE OBJECT. USE A COME-ALONG TO PULL TAUT. 6 . AN ANSI APPROVED BODY HARNESS SHALL BE CLASPED TO A LANYARD AND THEN TO THE OVERHEAD TEATHER LINE . HARNESSES SHALL NOT BE REMOVED OR DISCONNECTED WHILE INSIDE THE EXCAVATION. NO MORE THAN 2 WORKERS CAN FASTEN TO A TEATHER LINE AT ANY GIVEN TIME. 7 . IF MORE PRACTICAL, THE HARNESS/LANYARD COMBINATION MAY BE CONNECTED TO A NYLON LINE AND RUN THROUGH AN EQUIPMENT BOOM STRETCHED OVERHEAD AND MANEUVERED TO KEEP THE LINE VERTICAL. ANOTHER WORKER AT LEAST 150% HEAVIER SHALL HOLD THE LINE FROM OUTSIDE THE HOLE . THE ROPE SHALL BE HALF WRAPPED AROUND THE WAIST ALLOWING FOR PROPER ROPE TENSION AND THE END FASTENED TO A STATIONERY OBJECT. 8. JUMPING TO AND FROM TANKS IS NOT PERMITTED. WALKING PLANKS SHALL BE SET FROM EACH TANK TOP TO THE NEXT AND ONE FROM THE BANK TO THE CLOSEST TANK. EACH PLANK SHALL ALTERNATE FROM ONE END OF THE TANKS TO THE OTHER. THEY SHALL BE AT LEAST 2" THICK AND CUT TO SIZE AS TO ACCOMMODATE 8"-12" PAST THE POINT OF CONTACT ON BOTH ENDS. THEY SHALL HAVE A PROTECTIVE LAYER OF RUBBER OR EQUIVALENT TO PREVENT SLIPPING AND DAMAGE TO THE TANK SURFACE. 9 . IT IS MORE DESIRABLE TO ELIMINATE PUTTING WORKERS ON A TANK. THEREFORE, OPEN-END LIFTING HOOKS OR "S" HOOKS SHALL BE LSED FOR LIFTING TANKS WHENEVER POSSIBLE . ROPE GUIDES CAN BE TIED TO THE HOOKS TO BE PULLED OUT OR GUIDED IN FROM OUTSIDE THE TANK HOLE. IF HOOKS HAVE SAFETY LATCHES, PROD OPEN WITH AN EXTENSION POLE FROM OUTSIDE THE EXCAVATION. 10 . A LEVEL CAN BE ATTACHED TO AN EXTENSION POLE AND LOWERED TO THE TANK TOP FROM THE OUTSIDE BANK.