Jean, you don't need the Subgrade surface. You need to display the Design surface created by the Roadway Designer and display that on the cross sections in addition to the Components. Then the EAVs will give you the correct earthwork between the existing and design surfaces and account for the Components at the same time. When you run the EAVs just toggle on the Create Report option and you'll find that there are reports that will give you the dirt quantities as well as reports that will give you the Component Quantities if you need or want them.
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