5/12 EE HELPED SHOVEL MAT'L DUE TO CRUSHER CONVEYOR JAM. FROM 8AM TO 11:20AM & FROM 4:30PM TO 5:20PM 5/13 EE RAN WATER WAGON FOR APPROX 2 HRS. STATED THAT HE FELT IT JOLT HIM. 5/14 EE AWOKE WITH TINGLING/NUMBNESS IN HIS ARM & HAND. DIAGNOSED AS DEGENERATIVE BULGING DISCS AGGRAVATED BY SHOVELING & OPERATION WATER WAGON