Sorry for the short notice, but the section of the main building that the Yankee Air Museum wants to save (about 175,000 square feet from the big doors back into the plant) will be open for a public tour at 3:00 PM today, Eastern time according to the Ann Arbor news. You have to call the air museum to be registered (so you can get on the grounds) but there is supposed to be no charge for the tour. Please Yahoo or Google WILLOW RUN DEMOLITION to find the link to the article and the phone number.
I've looked over the chart as an overlay to the plant layout when Kaiser-Frazer built cars and airplanes there. It appears to show no pattern which may confirm what I heard that the ground settled in various places under the concrete pad that was the "floor" of the building. If my info is correct, the pad will have to remain and be maintained, lest the toxic stuff get exposed. The Ann Arbor News article shows a recent chart; there are at least 11 areas considered to have toxic ground under the pad.