Unsafe Practice  Same Tremie Pipe was used without taking corrective action (refer to NCR 13 dated 26 Dec 2018).  Furthermore, Tremie Pipe was not cleaned from inside after concrete casting of secant piles at TWS no A3-29. Concrete was stuck inside the tremie pipe. Such unsafe practice may lead to serious  incident such as rupture of tremie pipe.
Hazard category: Use of tools and equipment