THIS ORDER DIRECTS ATLANTIC RICHFIELD TO PERFORM REMEDIAL ACTION FOR SMELTER HILL FACILITIES AREA REMEDIAL DESIGN UNIT. HUMANS AND WILDLIFE ARE AT RISK FROM EXPOSURE TO THE HAZARDOUS SUBSTANCES IN THE CONTAMINATED SOILS AT THIS SITE. THE ACTUAL OR THREATENED RELEASE OF ONE OR MORE HAZARDOUS SUBSTANCES FROM THE FACILITIES MAY PRESENT AN IMMINENT AND SUBSTANTIAL ENDANGERMENT TO THE PUBLIC HEALTH OR WELFARE OR THE ENVIRONMENT.