At approxiamately 1700 hours on June 9, 1999 Caroline County E-911 was called for a propane leak in a commercial structure. Engine Companies 1, 2, & 4 were dispatched with Rescue Station 1. E-10 was first on scene with a relief valve blowing behind the China Inn Restaurant. E-10, T-12, E-21, E-40 and SQ-1 were on the scene. Four inch was laid for a protable monitor to be placed on the tank and the tank was shut off. Command marked the incident under control and released E-21 and E-40 and held all others for an undetermined amount of time for mop up.