How is MEF calculated for Canadian VNC?
According to Aeronautical Information Circular 26/11 VFR Navigation Charts—Clarification of the Maximum Elevation Figure the 


  The MEF is calculated by taking the higher value of:
  
  
  the top elevation of the highest obstacle plus the vertical accuracy (variable) of the terrain
  source data; or
  the elevation of the highest terrain plus 328 feet plus vertical accuracy of the terrain source
  data.
  


So the 2700' could come from 2290' plus 328' rounded up to next hundred feet.