Pool backwash to sewer

Hi, Guys
I have an issue that i have never ran into before, as so the 2 local inspectors.

I have a customer with a hotel. The hotel has a under ground pool that the, pool back wash goes up to the 1st floor building drain tied in directly.

So how to separate this by means of an "air-gap".

My only thought is to size an ejector pump, holding tank, trap vent, vent through roof, run pump drain to building sewer. The inspector agrees that this would work. But its crazy $$...just for a pool backwash.

Is there anything else to do? Thought of an rpz, but thoughts are the pressure from the backwashing would screw it up.

Oh, and there isn't any place to put a dry well or exterior tank.

Thank you
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