Just prior to the 8 o'clock hours, Sussex EOC alerted Milton (85), Georgetown (77), Indian River (80), Lewes (82), Mid Sussex (91), and County Medics for a structure fire at the Allen Harim processing plant, on Harbeson Rd. 85-8 with Asst. Chief Millman (85-18) and 82-8 with Asst. Chief Stephens (82-16) responded immediately, and arrived within three minutes to find a two story industrial processing facility with nothing showing on sides "A" and "D". Chief Millman established the command and Chief Stephens was assigned interior operations. Chief Stephens entered the structure and found a smoke condition in the cold storage room. Engine 77-4 arrived first and were placed on the "D" side at their own hydrant with the fire department connection, and advised to stretch an handline into the "D" side and contact 82-16. 85-4 and Ladder 85 arrived, their crews were sent to the roof to check the parapet and outside wall on the "A" side. Tower 77 arrived and was positioned on the "A" side and assisted with roof operations. Ambulance 85, 82, and 91, along with medics established a rehab area in the parking lot. The remaining crews staged in the manpower area and assigned as needed. Crews found a fire in the alpha side wall, just under the roof line and extinguished same. Crews remained on scene for just under an hour completing overhaul and packing up. The State Fire Marshalls Office is investigating. Units responding 85-8, 85-4, Ladder 85, 85-2, Tanker 85, Rescue 85, A-85, 77-4, Tower 77, Tanker 77, 82-8, 82-2, 82-3, Tanker 82, E-82, 80-3, Tanker 80, C-91, Medic 106, Fire Police