(9)The officer-in-charge shall suitably arrange for the posting of the sentry at the gate during day and night and no sentry shall ordinarily be kept on duty at the gate for more than four hours at a time and not more than twice during a period of twenty-four hours. The officer-in-charge shall ensure that as far as possible, the sentry on duty, during the normal hour of ingress of the employees and workers is not posted during the normal hour of their exit.
