I presume you mean 'sea level' not 'see level' in which case it would not be a CTA as these start at a defined lower limit amsl to a defined upper limit; it's CTRs which start at the surface. For any CTR or CTA they would normally be at least Class D airspace so you would need permission to enter however if they were Class E you only need permission if you are IFR.
Can you post the ref of the NOTAM so we can all see what you mean?