Thanks so much gfunkdave, Finite Elephant and donnde ... the idea of the 2 maps was especially helpful!

The existing runway lines up with Beeline Dr. and the new one looks to line up with Wilson Court on the west side of O'Hare, so that puts 10C/28C a quarter mile south of 10L/28R.

The final runway definitely crosses Irving Park, and lines up with a Midway Court (south of Irving Park), which is a half mile south of Wilson Court (10C/28C location), so it looks like it will be .75 miles south of existing 10L/28R.

Thanks so very much for everyone's help ... have a great night. ecowrites