AutoCAD Civil 3D

[#1]

cogo points would be the spot heights from the survey that you are looking at (probably)

Where did you get the contours from?

[#2]

the contours and the spots were broken out of a survey file.

[#3]

Just an FYI, in the Civil 3D world when we say a surface was built from survey, many of us take that to mean the survey module was used to create the components of the surface. It is not the same as using points, breaklines and contours from a CAD file to build a surface. So in future posts it would help to make that distinction as the solutions to a problem depends on what method was used.