When converting Civil 3D data back to a previous version using LandXML it is important to use the correct version of LandXML. This table will help you choose the correct output format.
A quick presentation of transferring points and a surface model from Carlson Survey to Civil 3D using LandXML.
Note: In the last part of the video the presenter edits an existing surface style making it look harder that it actually is. A style to display contours is already defined in Civil 3D’s drawing template you simply change the style from a drop-down list in the surface properties instead of digging into the guts of an existing style to change settings.