Section 152(b) in The Building And Other Construction Workers '(Regulation Of Employment And Conditions Of Service) Central Rules, 1998
(b)the responsible person referred to in rule 121 conducts necessary test before the commencement of a tunnelling work for the day and at suitable intervals as fixed by the Director General to ensure that the permissible limits of exposure are not exceeded and a record of such test is maintained and is made available for inspection to the Inspector having jurisdiction, on demand.
