Well, I would just ask the Fire Marshall how close a potential fire hazard can be to a driver being loaded into a buggy and/or a driver inside a buggy and define a buggy prep area as 'someplace a driver is being loaded into a buggy and/or someplace a driver is inside a buggy'.
I assume the Fire Marshall, after weighing all of the potential, uh, potential fire hazards (and considering his own personal and professional liability in the event of a driver burning to death), will say something like 'half a mile, but perhaps farther, depending on how much of a threat I perceive it to be'.
Because, honestly, I cannot imagine a scenario where the Fire Marshall will be overruled if he thinks there is a fire hazard. 'But Bob, we all decided (yourself included!) to define 'near' as XXX feet, and that barrel of solvent is XXX+1 feet away!' is not going to keep the Fire Marshall from shutting down Sweepstakes if he thinks there is a fire hazard.