3000 ft. Minimum Altitude Restriction

The 3000 indicates an Altitude restriction placed at the beginning of the 279 Procedure track and the ending of the 099 track.

This simple means that before we approach this point, we must be within the Altitude restriction given.
 

Possible Altitude Restrictions:

ALTITUDE
5500 2300
mandatory altitude minimum altitude
4800 2200
maximum altitude recommended altitude