The Board, in its discretion, may, upon application
by a significant industrial user and a showing of hardship, allow
a significant industrial user to dispense with manhole and associated
facilities, provided that the Board assures that such relaxation of
this requirement will not lead to a violation of the terms or policies
of this Part 4 and provided, further, that the significant industrial
user maintains alternate facilities sufficient to monitor the nature
and quantity of its discharge into the POTW and to allow for sampling
of such discharge, such alternate facilities to be acceptable to the
Board.