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.