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NFPA 820 - Delineation Between Classified and Unclassified

Question asked by gavin.don on May 8, 2018

I have a two story WWTP where the wet well is located at the lower level, and directly above is a chemical storage area.  The chemical storage area requires and emergency shower, which requires a floor drain.  The floor drain is currently designed to penetrate the floor and is trapped, the pipe then runs horizontally and discharges into the wet well.  The trap has an automatic trap primer and there are no other openings in the floor to the wet well.  Does the drain trap allow the chemical storage area to be unclassified or is it considered "part of the wet well"?