At 1832hrs (6:23pm) Dorchester Central Dispatched Haz-Mat 1-1 to assist Station 6 (Hurlock) with A reported (Large) fuel spill. Units arrived on location to find a single vehicle MVC with fuel leaking from A refrigeration unit trailer tank. Command was established and crews cleaned up & contained approximately 40 gallons of diesel fuel from the tank and road surface with the situation under control command was terminated and all units were placed in service without incident.