Modeling for curbed median nose

I am trying to model a curbed median nose like the following picture. 

So far I was able to use linear template to get the curb lines in for the median. 

But for the middle sod part, I tried to use corridor clipping reference to clip out the middle pavement and apply a terrain and surface template in the middle, but it doesn't work out at all. 

Anyone knows of a simple way to help with this problem?

Thanks. 

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