THE JACOBS SMELTER SITE INCLUDES SEVERAL FORMER SMELTER SITES IN AN AROUND THE TOWN OF STOCKTON. THIS ORDER ADDRESSES ONLY THE PORTION OF THAT SITE, ON THE WESTERN EDGE OF THE TOWN OF STOCKTON WHICH IS OWNED BY UNION PACIFIC RAILROAD. BETWEEN THE RAILROAD TRACKS AND THE SMELTER SITE ARE SETTLING PONDS WHERE ARSENIC AND LEAD WERE DEPOSITED BY FLOWING WATER. CONTAMINANTS WERE ALSO DEPOSITED ALONG THE RAILROAD TRACKS. THE REMOVAL ACTIONS REQUIRED BY THIS ORDER ARE NECESSARY TO PROTECT THE PUBLIC HEALTH, WELFARE, AND THE ENVIRONMENT.