Rationale:

Helicopters can fly there and there has got to be some place very close by to land. Bring in gas fired pumps and the fuel/lubricants to maintain them. This type of pumping is a bugger, because the slightest loss of prime can cause problems. However, once prime is established, those little suckers are like the energizer bunny!

The math on it is easily figurable-out-able by the fire service. Give 'em a calculator and three minutes--although tise situation may require ten minutes.