EMPLOYEE FILLED WATER TRK AT SHALE PIT WATER SPOUT, HE THEN PROCEEDED NORTH AROUND WEST DRAINAGE POND. TRUCK THEN HIT THE BEAM AND WENT OVER THE EDGE INTO WATER. EMPLOYEE BROKE WIDOW AND EXITE D TRUCK. HE THEN WAS TAKEN TO HOSPITAL, WAS X-RAYED AND STITCHES PUT IN ARM.