Armtec (26H-RN1) Reynolds Metals Company / Koppers / Waste Management / Great Lakes Chemical / Pine Bluff Arsenal (1H-RN2) Reynolds Metals Company / Lockheed Martin / Reynolds Metals Company / Storage (Only) Clean Harbors El Dorado LLC / Arkansas Lion Oil Company / Rocketdyne (8H-RN1) Clean Harbors El Dorado LLC / Ash Grove Cement Company (21H-RN1) Weyerhaeuser Company / Arkansas Ash Grove Cement Company / Ash Grove Cement Company / Other Treatment 1 Clean Harbors El Dorado LLC / Arsenal (1H-RN2) Clean Harbors El Dorado LLC / Sentinel Industries (12H-RN1) Reynolds Metals Company / Clean Harbors El Dorado LLC / Cement Kiln 1 Ash Grove Cement Company / /