The Board, in its discretion, may, upon application
by a significant industrial user and a showing of hardship, allow
the sampling manhole and associated facilities to be constructed off
the significant industrial user's premises in a public street or sidewalk
area, provided that such facilities will be located so as not to obstruct
the landscaping, parking or driving of vehicles, flow of pedestrian
traffic or in any other way interfere with or detract from the local
environment or neighborhood character.