Vice Chairman Santosh Yadav suspended junior engineer S K Sinha and ordered for adverse entry in the records of Assistant Engineer Arvind Chaudhry in the case.
A warning letter has been issued to Executive Engineer S S Shukla.
Yadav has also ordered to cover all open pits near roadsides and public places.
Meanwhile, the deceased, whose body was recovered from the pit on May 6, has been identified as Anil Kumar Tayal.