Back Bay ground needs a site-specific reading
The state environmental assessment for the Chelsea-Ducktown bulkhead project maps its soils as Psammaquents, frequently flooded, with coarse to gravelly sand above a mucky peat layer. That description applies to the project corridor, not every Atlantic City property. We wouldn't use it to label your foundation unstable.
Instead, it gives us a reason to review the actual wall and supporting conditions carefully if movement is visible. Your inspection should distinguish a damp surface from a displaced wall. Where the evidence calls for an engineer's assessment, a waterproofing coating is not a substitute.