I'm Looking for opinions out there on a fire sprinkler hazard classification per NFPA 13 2002 edition chapter 5. Given a CFC 2007 regulated repair garage S-1 occupancy that is required to be protected with fire sprinkler system. Now the operation is capable of servicing 9 motor vehicles, no hot welding, but tune up, tires, and lube/oil changes performed. My question has to do with evaluating the correct hazard classification for water supply to the fire sprinkler system One of the operations in the pit 1000 square foot area is approx 1000 gallon tank of class III combustible liquid, connected to two hose station dispensing units above floor in a repair area. The system is pressurized at 300 psi. Based on this combustible liquid and pressurized amount, would it be appropriate to classify the area protection as extra hazard group 1 instead of ordinary group 2? The annex of 13 does have as examples for ord 2 listed repair garages, but eh1 has combustible hydraulic (under pressure) fluid use areas. I also read some information in the applicable 13 handbook advising the EH1 areas would be areas with systems utilizing combustible liquids under pressure. As an AHJ, we want to ensure reasonable protection design, and I understand that the generic mention of repair garage does not mean every repair garage is immediately a ordinary group 2 design, but all combustible content, quantity, specific operations, must be evaluated to provide the correct amount of water minimum to control a fire involving the hazard. Any opinions or advise out there please reply!