Wetland Buffer using Parcels

We know when creating wetland buffers it is not as simple as offsetting a closed polyline, it requires allot of manipulation to do it correctly, until know. 

First of all create a Parcel of the Wetland area, making sure your parcel style is a filled hatch, like ansi31.  Then to create the buffer, start the offset command and select the Parcel Hatch - whala.  A perfect buffer area.  I don't why it works but I'm not complaining for once about Civil 3d.