THIS IS A RESPONSE ACTION AGAINST THE RESPONDENT UNDER SECTION 106(A) OF CERCLA, ORDER THE RESPONDENT TO CONDUCT A REMOVAL ACTION IN THE COMMUNITY OF WALKERVILLE, MT. EPA HAS DETERMINED THAT THERE MAY BE AN IMMINENT AND SUB- STANTIAL ENDANGERMENT TO THE PUBLIC HEALTH OR WELFARE OR THE ENVIRONMENT BECAUSE AN ACTUAL OR THREATENED RELEASE OF HAZARDOUS SUBSTANCES FROM THE MINE AND MILL WASTE PILES AND CONTAMINATED SOILS IN WALKERVILLE, MT.