The issue here is that the exterior boundary is made from the corridor from the surface and 2 corridors are not combined to create one exterior boundary. So you can create both corridors in a single surface but the question is: how to get a suitable exterior boundary to remove all triangles between the 2 corridors ? create a shape (MicroStation), import it in the surface as exterior OR create 1 surface per corridor with exterior (S1 and S2) + your single surface (FINAL) without the exterior Then copy the exterior only from the S1 and S2 to FINAL with "Append" if feature allready exists Then you have to do some manual edit (I advise Feature>Edit points) to delete one side of the exterior to get a clean boundary with no overlap
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