Like, "vibration test"????

But if its a tight fit I find light gauge steel plate epoxied to the underside is even more effective.Also if there is a 'sinkerator' attached to the sink the vibration could be an issue so the extra support is a wise move.good luck

I plan on replacing with tile.I have tried a 5 inch scraper with a 4 foot handle, then I tried the same scraper and a 3 lb sledge, then I tried a hand held vibrating scraper you buy at Harbor Freight. 

It vibrates back and forth and you push it.

This is one of those tools that I have found more uses for once I had it .Multipurpose tool - this looks like a angle grinder but the head takes various attachments that vibrate.

Could be enough vibration to affect foundation or structure, especially if in the middle of the block where the bus speed will be higher.

Usually copper or pex is run with the joints being visible, and pipe doesn't just start leaking too often where there is not a joint unless if something has been moving it causing wear / vibration  or something else that would damage the pipe behind the wall or below the floor over time.In any case, you will likely need to do some drywall repair to make things look new and perfect again which will make your tenant happy.  

Structure-borne (vibration through the building materials)You can absorb the airborne waves with proper material selection.

Basically the clause reads as follows:1.DISTURBANCE, SMOKING, NOISE, ILLEGAL USE: Neither the LESSEE nor his family, friends, relatives, invitees, visitors, agents or servants shall make, permit or suffer any disturbing noises or vibrations by means of a human voice, radio, phonograph, stereo, television, piano or other musical instrument or other device or form of technology of any description within the building or Premises, nor commit or permit any nuisance to exist thereon, nor cause damage to the building or Premises, nor create or permit any substantial interference with the rights, comfort, safety or enjoyment of the LESSOR or other occupants of the same or any other apartment in the building, nor make any use whatsoever thereof than as and for a private residence.

Excessive noise can violate a tenants right to enjoyment here is the new York lawExcessive noise and vibrations violate a New York State law known as the “warranty of habitability.”