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On 7/14/05, OSC Wagner was contacted by Capt. Alan Brooke, Richmond's Hazardous Materials Coordinator. Capt. Brooke inquired about alternatives for extended air monitoring for ammonia. OSC offered EPA assistance, which was accepted.
OSC contacted START telephonically and requested them to respond to be on Site 7/15/05 @ 0900 hours.
OSC Wagner arrived on Site at 0700 hours and met with representatives from the Richmond Fire Department, including representatives from the Fire Marshall's Office. The goal of the response was to make the buidling safe so that the Fire Marshall could perform an investigation of the cause of the fire.
Two major operations needed to be performed on the building before it could be rendered safe: 1) Removal of ammonia from the pressurized tank and the refrigeration lines; 2) A partial dismantling of the second floor of the building to allow the fire investigators safe access for an investigation.
On 7/14/05, the owners' insurance company contacted LaRoche, now Airgas, a well-known ammonia distributor. LaRoche arrived on scene with a tanker truck for offloading on 7/15/05. Prior to the LaRoche representative entering the building, the Haz-Mat team members performed a Level B entry to determine the current ammonia concentrations. Ammonia was detected at approximately 70 ppm, but the Haz-Mat team identified a window on the eastern side of the building, which could be used to gain access to the tank for offloading. The LaRoche representative was able to hook into the system and begin offloading. However, because of the reduced pressure in the system, the liquid/gas phases quickly came to an equilibrium. Firefighters used water to cool the exterior ammonia tanker to try to drive some of the vapors in the tank into liquid form.
At approximately 1500 hours on 7/14/05, the system had reached an equilibrium whereby the vacuum on the tank had reached the maximum pressure of the tanker. The representative from LaRoche recommended mobilizing another tanker from LaRoche containing water to help "drive" more of the ammonia into the liquid phase of the tank. During these offloading operations, START remained on standby for air monitoring and to respond to any reports of ammonia odors in the neighborhood. Fortunately, there were no releases.
Once the building was safe for the LaRoche representatie to enter, he was able to determine that the cause of the leak was damaged packing around the valve. However, other valves on the system were not opened and the LaRoche representative noted complications in the system. Once the system was brought under a vacuum, the release stopped.
The second tanker truck arrived on scene at approximately 1800 hours. Operations were suspended for the night at approximately 2000 hours. Police remained on scene to protect the scene as the fire had not yet been investigated.
Because the fire officials deemed the tank safe, the OSC demobilized START on 7/14/05.
OSC Wagner returned to scene on 7/15/05 to oversee the remaining operations. The facility is located within 50 feet of a local farmer's market, which receives hundreds of customers on Saturday mornings. At approximately 0915, LaRoche was able to confirm only vapor remaining. The next step was to cut the vapor lines to the portion of the building which required dismantlement.
Richmond Fire Department Rescue and Haz-Mat Units, along with assistance from the LaRoche representative, made an assessment of the area. The lines were elevated above the second floor; therefore, operations needed to be carried out from a ladder truck.
At approximately 1530 hours, the lines were successfully cut and the ammonia retrieval operation were completed.
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