It has become more and more common to capture information with state plan coordinates. Unfortunatley data still is required with assumed coordintates. Client demands and request provide reality capture firms delivering data state planes and assumed coordinates. AutoCAD Civil 3D will deliver both if styles and settings are set up properly. I have provided an image below and images to compare your existing workflow and data with ADSK Solutions Solu-arounds.
info@ADSKsolutions.com to understand Stae plan and assumed coordinates.