A delivery driver from another company delivered a tanker load of hot oil emulsion for asphalt to the facility. The driver arrived onsite and hooked up a hose up from the tanker to the facility's pump. The pump feeds the emulsion to a storage tank. The driver opened the valve on the tanker and turned on the pump. The driver did not open the valve leading to the storage tank. The pump started making loud noises. The driver closed valve from the tanker. A Midland Asphalt Materials, Inc. site employee came out of an office to hit the emergency stop switch for the pump. At that time, the hose ruptured, spraying the two employees with the hot oil emulsion material. The temperature of the hot oil emulsion material is approximately 320 degrees Fahrenheit. The Midland Asphalt Materials, Inc. employee sustained second degree burns to the face and hand.