If you need a list/excel file of all ACI colors with RGB equivalents check out this blog:
http://civil3daid.blogspot.com/
I created this list because I found other lists online to be inaccurate. I use it in WaterCAD V8 for AutoCAD where ACI colors are not available when doing WaterCAD coloring of pipes, junctions, etc. If you have certain colors on a ctb file that you need in WaterCAD, just use the RGB equivalent and you should be golden. These RGB equivalents should work for any background color in ACAD except white. I find a white background in ACAD to be annoying anyway, but if there is enough demand for this I would create another list for the white background. I hope you find this list useful.