UNILATERAL ADMINISTRATIVE ORDER ISSUED TO ATLANTIC RICHFIELD TO DIRECT THEM TO IMPLEMENT THE ACTION MEMO AND OTHER ACTIVITIES RELATING TO ARSENIC CONTAMINATION NEAR DEER LODGE, MONTANA. EPA DETERMINED THAT A TIME CRITICAL REMOVAL ACTION WAS NECESARY FOR THE SITE AND ISSUED THE ACTION MEMO ON 10/26/98. ATTEMPTS AT IMPLEMENTING THE ACTION MEMO LAST FALL, PRIOR TO THE ONSET OF WINTER WEATHER, WERE UNSUCCESSFUL, BUT THE ACTION REMAINS A TIME CRITICAL REMOVAL AND IMMEDIATE IMPLEMENTATION THIS FIELD SEASON IS NECESSARY.