Two preferable locations exist, a southern one would put it out from Chicago's "south side", an area where low-quality residences are the typical. Because of the expressed concern about the lake view being ruined, this might be the better option. However, the airport would be nearly seven miles out into the lake, and while pictures that can be found on this site of Kansai show the mainland clearly despite it being three miles out, at twice that distance and then some the mainland will be visible from the airport, but from the shore it would appear very small. At lake level general city air pollution would prevent it from being visible at all except on clear days. We would also request that Helmut Jahn be the project's main architect. His use of glass would give the airport an intensely reflective nature, and the terminal building would be put on the city side. We would request that the terminal facing the city be designed essentially as a mostly smooth, glass structure, reflecting the lake, so whatever the case the airport would have a 'sparkly' nature to it with the greyer, brown runways in the background beyond sight. And lastly, the concerns of condominium owners must be taken in relation to those of farm owners near Peotone. I think an airport visible only by those who own northshore residences that are actually ON the shore and are a bit above it, meaning fifth-and-up story residences, would upset far less people than a massive inland project requiring the government to buy out a huge area of land.
As far as sinking is concerned, the lake bottom is made of a softer material than that which Kansai is on, but it is more stable. There are no Earthquakes and there is little geomorphing that takes place of any kind. The idea proposed for this project would be to drive skyscraper-like piles into the lake bottom farther down than those at Kansai, and once the sedimentary layers are secured with one form of concrete or another a thick steel framework, not unlike those used for the construction of off-shore oil wells, would be used to secure the bottom most layers of soil. The sight selected would be on as flat as level an area. In the elevation map shown of the lake's bottom in my previous post, you will notice an area East of the word "Chicago" and then somewhat North, where the fourth contour line dips South creating a large 'inlet' in that layer. This is our first proposed construction sight, because we would be building in a surrounded 'bay' where the lake-bottom rises around an enclosed area. That way the diagonal slopes of the sides of the island onto the surrounding natural lakebed would provide additional support. Because a concern with Kansai was in fact Earthquakes, very large rocks were used near the upper layers, which allows water and upper thinner soils to sift through. In Chicago that would not be nearly as much of a problem, so the entire mass of the island could be constructed in a far more solid and uniform fashion.
Runways would be at a due NW-SE angle (we are currently considering three parallel runways of 14,000, 11,000, and 8,000 ft. lengths). This would be so that flight paths into the airport would be neither over Chicago or north-shore suburbs or the Gary area.
No reasonable estimate of cost is yet available.
The mean depth of the lake at the proposed location is about 75 feet. The south-side location (which would require a ten-mile bridge though being only six miles from shore) has a mean depth of about 60 feet.