It is fairly rare to get a call, what happens is an incident occurs, say a truck rollover, the Fire service rings the pollution hotline, then they ring the on call incident response person, they can be any where in the state, they asses if we need to go out, if they are nearby they will go if required, if they are not close they call the regional on call person for the area. But if you actually get a call you usually do need to rush off ASAP