EMPLOYEE SUFFERED A LACERATION TO THE TOP OF HIS HEAD. HE WAS OPERATING A PAYLOADER TO MOVE MUD OUT OF 5D TANK. PAYLOADER BOUNCED AND KNOCKED HIS HARDHAT OFF & BOUNCED AGAIN, CAUSING HIM TO STRIKE THE TOP OF HIS HEAD ON THE HEADACHE BAR. HE WAS TAKEN TO MEDICAL CENTER BY AMBULANCE, WHERE THEY CLOSED THE CUT WITH STAPLES.