I am installing a new service for an outdoor bulk diesel fuel storage plant. It will be used for distributing fuel by the companies truck only (No customer access). I am looking for the distance that the service will need to be placed away from the tank and equipment so that it can be unclassified. I was thinking that it was somewhere around 30-35' but what I am reading in the code book (Art. 515), is telling me 15'. Is this correct?