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ALTERNATIVE A <br />Figure 4-3 illustrates Alternative A. As shown, a single 3300 <br />feet paved runway would be developed on virtually the same <br />alignment as existing Runway 16-34. The runway would be shifted <br />approximately 170 feet north of the existing threshold and <br />terminate approximately 300 feet south of the County State Aid <br />Highway (CSAH) 116 right-of-way. <br />In order to achieve necessary approach clearances (23 feet over <br />the railroad and 15 feet over CSAH 116), the proposed runway <br />ends would have to be raised significantly. The southerly end <br />of the runway would require approximately 15 feet of fill while <br />the northern end would require approximately eight feet of fill. <br />The disadvantages of this concept are that the runway is <br />severely restricted, the additional costs of fill, and the <br />resulting undesirable runway profile constructed on a manmade <br />"ridge". <br />Alternative B <br />Figure 4-4 illustrates Alternative B. This concept also <br />provides a single 3300 feet paved runway oriented in a 16-34 <br />direction. The proposed runway is shifted approximately 550 <br />feet to the north of the existing threshold and rotated one <br />degree. The rotation eliminates a restaurant from the south <br />clear zone and also eliminates two residential parcels east of <br />Limonite Street from the north clear zone. <br />The northward shift of the runway, however, does necessitate the <br />relocation of CSAH 116 and impacts up to seven additional <br />residences to the north. The relocation of CSAH 116 as proposed <br />would intersect County Road 56 at 149th Avenue Northwest. The <br />westward extension of CSAH 116 would then follow along the <br />originally planned alignment approximately one quarter mile <br />north of the currently planned alignment. Excavation quantities <br />could be fairly well balanced since soils are predominantly sand <br />and sandy gravel. <br />Approach clearances over the railroad to the south and relocated <br />CSAH 116 to the north meet or exceed Federal Aviation Regulations <br />Part 77 criteria. <br />Alternative C <br />The development concept for Alternative C (Figure 4-5) was based <br />on ultimately mitigating the impacts to residential development <br />north of the airport, avoiding relocation of CSAH 116 while <br />providing adequate approach clearances, and providing greater <br />wind coverage. <br />4-4 <br />