In addition to providing the civil/site design for the Old Steam Generator Storage Facility (OSGSF), Wiley|Wilson provided on-site field engineering support during the construction of the OSGSF and through the actual steam generator plant outage. This field engineering support covered a wide variety of tasks including supervision of the overall construction of the OSGSF, assistance in solving rigging and structural support challenges, and 3D CAD modeling to identify interferences that might occur during movement of the old and new steam generators during the outage.