Byalpha india Although in Dutch
this should give you an idea of the number of fire vehicles available at Schiphol's three Fire Stations.
Unfortunately only 32 of the 120 firemen (info from that site) would have been on duty at any one time. I imagine most of them attended as rescue workers. After working in what was described by a survivor as a blood bath would you expect them to just pick up what they had been doing at the moment of the crash?