DURING HEAVY RAIN, EE WAS ADJUSTING TRACKING ON L201 ELEVATOR. BECAUSE OF A CEMENT PILE ON ONE SIDE, EE TRIED TO REMOVE A GUARD FROM THE OPPOSITE SIDE. BECAUSE OF THE SLIPPERY CONDITIONS AND HAVING TO REACH OUT TOO FAR, EE SLIPPED AND LANDED ON HIS BACK. WENT TO DOCTOR ON 9/2/05. REQUIRES 6 FOLLOW UP VISITS.