Create a surface from point file

[Anonymous]

1. How can I create a DTM in Civil 3D by just using a point file in the mesh?
2. I have a situation where is a retaining wall and on both sides I have to simulate and calculate few volumes for storage of waste material.
Is it a way of using the pond option to do this? (since there are two sets of contours but not closed)
I would like to use the grading object and to interactively move up/down the footprint to update the contours on both sides and to extract the volumes of fill.
Any suggestions?

Really appreciate your help.

Florin Balcu
Perth, Wetsern Australia