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Phil many (not specific like Joe's Marina which will tell you nothing) marina's like Bill mentioned shy away from you scraping and sanding off old paint. Many if not all paints are poisonous and therefore yes the EPA has rules as applied to automotive paint shops.

A lot of marine yards also shy away from allowing this type work because the $100 grand plus yacht owners complain about the dust (colored) deposits they might get on their precious yachts requiring extra time to clean these good paying yacht customers. It is not just the lead based paints that pollute.

My last big paint job I wanted to do in a yard I couldn't due to some of the above reasons and the yard din't like the idea of residues being washed into the ground.
I ended up renting a empty building with concrete floor where I could clean and dispose of it properly. More expense but bottom line a lot less expensive than having a professional do it and the results were amazing (see pictures)

This picture is after compounding and waxing https://photos.app.goo.gl/btKlgnQU1uX...U1uXIFmop2 and as you can see un-acceptable.

After sanding the gelcoat https://photos.app.goo.gl/q1X878XTkBd...TkBdjwfiH2

All done https://photos.app.goo.gl/fNJlZhMernJ...ernJeoRM83

https://photos.app.goo.gl/J6x9dty1TUJ...1TUJZKCdC2

now of course a 32' boat like this is not done in a weekend after several prime coats, 3 top coats, barrier and anti fouling on the bottom, and all teak wood on deck took 8 weekends.

A professional job would have been $15K to $25K needless to say I did it for 1/10 of that with the same result including the transport.
https://photos.app.goo.gl/w5mGPCYW4sh...W4shmtZVn1