Making horizontal slices of the model?

Is there a way to find surface areas of fill at specific elevations using the 3d model? For instance, we are designing a service road that will have 15-25 foot of fill and we need to use a chemical compound to make the compaction quicker. They are going to lay down a one foot lift of dirt, then spray on the chemical. We need to give them the areas of all those 1 foot lifts. I was curious if geopak lets you take horizontal slices or something similar. Any help on this would be great!

Thanks in advance!

Brent Mould

CDM Smith