EE FELL FACE FIRST WHEN HE SLIPPED/TRIPPED DOWN A BANK TO A WATER VALVE. EE WAS OBSERVING THE LOADING OF THE WATER WHEN HE NOTICED THE 3"" WATER HOSE CONNECTOR WAS COMING LOOSE FROM THE STAND PIPE ON THE WATER TRUCK. HE HURRIED DOWN A BANK TO SHUT OFF THE VALVE WHEN HE SLIPPED & FELL ONTO THE GROUND. HE SUSTAINED A CONCUSSION/LACERATION TO THE FOREHEAD, NECK SPRAIN, RESTRICTED DUTY.