IEC provided engineering and drafting support to prepare Drawing Change Only (DCO) packages to support the update of the Upper American River Project – Process and Instrumentation drawings (P&ID). SMUD had eight (8) hydroelectric powerhouses with associated P&ID drawings that were in need of updates to collect field revisions over the life (40+ years) of the plants. The District had been using AutoCAD and Raster Design to make CAD vector drawing changes to the original scanned, hand drawn design drawings. IEC reviewed each drawing to understand the process intent and to identify missing information. Our engineers walked down each system at each assigned powerhouse and made notations on the drawing to reflect the as-built condition and then incorporated the as-built information on the drawings provided by SMUD.