Ark. Code Ann. § 8-7-223

No hazardous waste landfill disposal facility off the site of generation shall be located within one-half (½) mile of any occupied dwelling unless the applicant shall affirmatively demonstrate and the Division of Environmental Quality shall specifically find that, because of the nature and amounts of the materials to be placed in such hazardous waste landfill disposal facility, a lesser distance will provide adequate margins of safety even under abnormal operating conditions.