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A two-phased approach to the alternative expansion <strong>of</strong> O’Hare<br />

facilities was used <strong>in</strong> this analysis. The first approach is labeled<br />

the unconstra<strong>in</strong>ed alternative and the second the constra<strong>in</strong>ed<br />

alternative. The unconstra<strong>in</strong>ed alternatives are based on the<br />

premise that O’Hare could be developed to vary<strong>in</strong>g degrees<br />

through the expansion <strong>of</strong> airside and landside activities to meet the<br />

future demand levels. In the constra<strong>in</strong>ed alternatives, the<br />

development <strong>of</strong> O’Hare was limited to a level that balanced with<br />

the operation <strong>of</strong> the exist<strong>in</strong>g physical airfield and Air Traffic<br />

Control requirements.<br />

The unconstra<strong>in</strong>ed alternatives refer to methods available to<br />

accommodate large growths <strong>in</strong> activity which would require the<br />

construction <strong>of</strong> new runways at O’Hare.<br />

The constra<strong>in</strong>ed alternatives refer to an activity growth rate<br />

capable <strong>of</strong> be<strong>in</strong>g accommodated on the exist<strong>in</strong>g runway layout at<br />

O’Hare. 16<br />

A constra<strong>in</strong>ed demand scenario <strong>for</strong> O’Hare was selected. The<br />

selection <strong>of</strong> the constra<strong>in</strong>ed scenario was based on the undesirable<br />

environmental effects <strong>of</strong> expand<strong>in</strong>g O’Hare to meet the<br />

unconstra<strong>in</strong>ed aircraft demands.<br />

It was shown that beyond 1990 additional runway facilities would<br />

be required.<br />

As a result, a policy decision was made by the City <strong>of</strong> Chicago to<br />

limit the growth <strong>of</strong> future aviation activity at O’Hare to that<br />

which could be accommodated by the exist<strong>in</strong>g runway facilities.<br />

A complementary role was selected <strong>for</strong> Midway to accommodate<br />

as much <strong>of</strong> the unsatisfied O’Hare demand as possible with<strong>in</strong> the<br />

exist<strong>in</strong>g airfield limitations. 17<br />

E. What Does The 1975-1995 Master Plan/O’Hare Development Program (ODP-I)<br />

Evidence Demonstrate About The Current Controversy<br />

1. A Master Plan was used by Chicago to conduct what purported to be a public<br />

plann<strong>in</strong>g discussion as to what airport facilities would be needed <strong>in</strong> the Chicago<br />

area to meet the long term aviation needs <strong>of</strong> the region.<br />

2. The master plann<strong>in</strong>g period was twenty years.<br />

3. The master plann<strong>in</strong>g process has, at its core, the development <strong>of</strong> a long term<br />

demand <strong>for</strong>ecast <strong>for</strong> passenger growth and aircraft operations growth over the<br />

plann<strong>in</strong>g period.<br />

4. The demand <strong>for</strong>ecast <strong>for</strong> growth <strong>in</strong> passengers and aircraft operations is compared<br />

to a capacity assessment <strong>of</strong> the exist<strong>in</strong>g airport facilities.<br />

16 Exhibit C 7 (emphasis added). Volume XVI <strong>of</strong> the 1975-1995 Master Plan, Draft Environmental Assessment<br />

Master Plan Development [1984-1985] Page II.3-1.<br />

17 Exhibit C 7 (emphasis added). Volume XVI <strong>of</strong> the 1975-1995 Master Plan, Draft Environmental Assessment<br />

Master Plan Development [1984-1985] p. II.3-2.<br />

6

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