Delhi Transport Minister Gopal Rai has sought a report from the DTC over the issue.
An official of DTC said that employees from Sukhdev Vihar depot and Tekhand Depot were found indulging in misconduct during a surprise check by the Managing Director of DTC in south Region.
The official said that DTC drivers Rambir Singh, Harkesh, Suresh Kumar and a conductor Indarjeet Singh were allegedly wasting time during duty hours and had parked their buses unscheduled at ESI Hospital near Tekhand Depot.
DTC also issued shaw-cause notice to four contractual staff, all from Tekhand Depot, for removal from the service and termination of their contract, officials added.
"Managing Director has given a clear cut massage to all employees that any such misconduct will not be tolerated, Minhas said.
