AutoCAD Civil 3D :: Grading Against A Retaining Wall

Sep 8, 2012

I have a platform at level 13.275m and nearby there is a retaining wall at aprox. level 4.0m. 

For the wall i've made a surface using feature lines from EG till level 15.0m and then pasted into the EG surface to create the 'barrier' for the slope. But when i do the grading with the fill slope projection to surface, when it reaches the retaining wall section, the contour lines go crazy and if i do a quick profile, the fill slope line (obvious) is iregular, rather than a straight down line (2:1)  going from level 13.275m till it hits the EG.

I've attached a picture to show the problem better.

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