EE WAS WALKING FROM FILTER ROOM PAST BATH ROOM TOWARD FRONT SERVICE DOOR BY PRESSURE WASHER, NEAR BATHROOM AND TRIPPED OVER PORTABLE STAIRS NEAR HOSE PRESS MACHINE. NOW IS EXPERIENCING SORE LO WER BACK AND RIGHT SIDE, MAY HAVE CRACKED A RIB. 2/14/00 UPDATE - SAW DR AND ALL IS O'KAY PER EE AND DR. NO CRACKED RIBS.