I can't comment on the electrical safety aspect, except to say that poorly executed electrical work and liquid fuels make very poor bedfellows. I'll leave the electrical critique to the experts. However;
1. Alcohol at 30% water content is flammable and 300 gallons, heck - that poses a real fire risk. The amounts of vapor lost in the filling process may be drawn off effectively by the extraction system, but in a worst case fire scenario could actually make the situation worse. Do they mix dry alcohol and water in the facility, or buy in the 70% proof?
Alcohol fires are really scary- the flames are nigh on invisible.
2. If the alcohol is methanol, [ which is probable, unless you are in a moonshine factory! ], it poses severe health risks, as it's very poisonous, including the fumes.
If it's ethanol, you can get inebriated on the vapors, but that's not what you want when you need your wits about you at work.
Alan
