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<br />within the RPZ. It is preferred that the <br />airport own the property through fee <br />simple acquisition, however, avigational <br />easements (providing control of <br />designated airspace within the RPZ) <br />can be pursued if fee simple purchase is <br />not possible. It should be noted, <br />however, avigation easements can often <br />cost as much as 80 percent of the land <br />value and may not fully prohibit <br />incompatible land uses from the RPZ. <br />Also, the area encompassed by the RPZ <br />envelopes the required RSA, OFA, and <br />areas needed for installation of <br />approach lighting systems, all of which <br />would be required to be located on <br />property owned in fee simple. <br /> <br />The RPZ for Runway 12 is for lower <br />than three quarters of a mile visibility <br />because of the existing ILS approach. <br />This RPZ has an inner width (also <br />known as the primary surface) of 1,000 <br />feet, outer length of 1,750 feet, and an <br />overall length of 2,500 feet. No other <br />runway is currently served by an <br />instrument approach, thus current <br />runway protection zones are for visual <br />conditions. <br /> <br />Future planning will include additional <br />instrument approaches. The primary <br />runway should provide at least one <br />approach with lower than three <br />quarters of a mile visibility, while the <br />opposite end should consider at least <br />one mile visibility. The crosswind <br />runway(s) should be planned for GPS <br />approaches providing not lower than <br />one mile visibility. <br /> <br />It is important to note that for any <br />approach providing lower than one mile <br />visibility the RPZ's inner width increase <br />from 500 feet to 1,000 feet. Federal Air <br />Regulation (F.A.R.) Part 77 establishes <br /> <br />the height and hazard criteria for <br />facility development both on and off <br />airport. F.A.R. Part 77 has established <br />a primary surface which is equal to the <br />inner width of the RPZ. The primary <br />surface is an area which can have no <br />facility development unless the facility <br />is fixed by navigational function (eg. <br />lighting, ILS antenna, signage, etc). <br />F.A.R. Part 77 further requires that <br />obstacles be placed to the side of the <br />primary surface at a seven-foot lateral <br />to one-foot horizontal increasing slope. <br />For example, a ten foot obstacle would <br />need to be at least 570 feet to the side of <br />runway centerline (500 feet for the <br />primary surface, then out 70 feet for the <br />seven to one slope). This slope is called <br />the transitional surface and is what is <br />used to define the building restriction <br />line (BRL). <br /> <br />Typically, airports such as San Marcos <br />Municipal Airport set the building <br />restriction line at 35 feet. Thus, <br />planning for the primary runway should <br />consider that the BRL would be 745 feet <br />to either side of runway centerline. For <br />the crosswind runway(s), the BRL <br />should be planned at 495 feet to the side <br />of centerline for a visual or not lower <br />than one mile visibility approach. <br /> <br />TAXIWAYS <br /> <br />The taxiway system at San Marcos <br />Municipal Airport is adequate to meet <br />current operational needs. As aviation <br />demand increases and a need to develop <br />aviation facilities is realized, additional <br />taxiways will be needed to enhance <br />operational efficiencies. Details of <br />specific taxiway improvements will be <br />discussed with each alternative. <br /> <br />4-9 <br />