Trimble Business Center

Hello,

Not sure if I'm doing something wrong.

I have a project with over excavation of subsoil. I have three surfaces. Original ground, SLR Baseline (bottom of excavation per contract), and Completed Subsoil Excavation (actual completed excavation).

The original grade is the highest elevation.

The SLR Baseline is lower than the original elevation.

The completed subsoil excavation is the lowest elevation.

When I run a surface-to-surface earthwork report I get the following results:

OG to Baseline cut 5826.50 cubic yards.

OG to Completed cut 6818.0 cubic yards.

Difference between the above reports is an additional 991.5 cubic yards of cut material. 

Baseline to Completed cut 1463.2 cubic yards.

Shouldn't the OG to Completed calculate to the amount cut from the OG to Baseline plus the amount from the Baseline to Completed?

I've uploaded a screen shot of the surfaces from the surface slicer and the three reports.