EE KNELT DOWN TO PLACE A WEDGE IN A GAP BETWEEN THE BOTTOM OF A 3C CAN & FLOOR.(A CAN IS A ROOF SUPPORT DEVICE THAT IS USED TO SUPPORT TAILGATE ENTRY, MEASURES 8' HIGH X 36"" WIDE & IS FILLED W ITH ASH OR OTHER MATERIAL AND SEALED ON ENDS). UPON INSPECTION TO LEVEL CAN EE COULD SEE A LUMP OF COAL UNDERNEATH. EE SWEPT HAND UNDER CAN & FELT A SCRATCH & HAD A LACERATION REQUIRING STITC