THE SITE CONSISTS OF A RAILROAD YARD WHICH CONTAINS THE UNLINED IMPOUNDMENT AREA. THE SLUDGE IN THE IMPOUNDMENT AREA IS BELIEVED TO HAVE COME FROM AN OIL/WATER SEPARATOR WHICH NO LONGER EXISTS. AN INSPECTION, CONDUCTED ON 5/20/93, REVEALED THAT THE SLUDGE CONTAINED HIGH LEVELS OF LEAD AND LOW PH. THIS COMBI- NATION MAY POSE A HAZARD FROM DIRECT CONTACT EXPOSURE. POTENTIAL DIRECT EXPOSURE TO TOXIC MATERIALS EXISTS BECAUSE OF UNRESTRICED ACCESS TO THE AREA. THE POPULATON WITHIN A 4 MILE RADIUS IS 89,900.