6. The lessee is required to employ and keep available always at his own expense one/two licensed driver(s) and three boatmen for each marboat, plying with an engine by day, and at least four boatmen for each marboat without engine, if plied and two boatmen for a single boat plying by day/day and night. He shall immediately discharge any driver or boatman whose conduct or ability may not be considered as satisfactory by the Executive Engineer
6.