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<br />The city has another option to fully <br />regulate land uses (with regard to <br />airport compatibility) for specific areas <br />near the airport without the need for <br />full purpose annexation if the city <br />population reaches or exceeds 45,000. <br />Currently, the city's population falls <br />short of this threshold. The city could <br />either wait until population growth <br />reaches the threshold or act through full <br />purpose annexation to envelop areas <br />which will bring the population to the <br />threshold. If near term planning is <br />needed, annexation would likely be <br />required which could be costly in terms <br />of new services to be provided. <br /> <br />A final option is to allow the areas <br />around the airport to remain <br />unincorporated. It is unlikely that <br />county land would be developed for <br />significant residential areas due to the <br />lack of services available from the <br />county. The city could attempt to work <br />with the surrounding jurisdictions to <br />ensure that airport compatibility <br />planning is considered. This method <br />leaves the city with the least amount of <br />control, but would not prohibit any <br />future moves towards one of the <br />aforementioned options available. It <br />will be incumbent upon the city to <br />proceed with a measure which meets <br />the goals of both the citizens of San <br />Marcos and the aviation community. <br /> <br />AIRPORT DEVELOPMENT <br />ALTERNATIVES <br /> <br />The remainder of this chapter will <br />detail airport development alternatives. <br />Most planning efforts segregate airfield <br />and landside elements within the <br />alternative analysis. For this plan, <br />however, it is necessary to first identify <br /> <br />4-15 <br /> <br />airfield configuration options available <br />and then select an airfield configuration <br />before a detailed landside concept can <br />be developed. The goal of this analysis <br />is to present alternative airfield <br />scenarios and landside development <br />areas which would correspond with the <br />specified airfield configuration. <br />Detailed landside facility development, <br />such as hangar areas, will be presented <br />in the next chapter once an airfield <br />orientation is selected. Each <br />alternative, however, will depict a <br />potential ATCT and ARFF site. <br /> <br />AIRPORT ALTERNATIVE 1 <br /> <br />The first alternative considers <br />maintaining Runway 12-30 as the <br />primary runway in the future. To serve <br />in this role, extension potentials were <br />examined. As previously mentioned, <br />planning should consider providing <br />7,000 feet operational length on the <br />prImary runway. <br /> <br />As depicted on Exhibit 4B, Runway 12- <br />30 is currently limited from providing <br />7,000 feet given existing airport <br />boundaries. Exhibit 4B depicts <br />Runway 12-30 at 6,400 feet, providing <br />full RSA and OFA within airport <br />property. State Highway 21 to the <br />northwest and Reedville to the <br />southeast pose extension constraints to <br />Runway 12-30. This extension <br />alternative would require, at a <br />mInImum the acquisition of <br />approximately 14 acres of avigation <br />easements in Reedville for the RPZ. <br /> <br />The city may choose to extend Runway <br />12-30 to 7,000 feet, however, this would <br />significantly increase development <br />costs. Either State Highway 21 would <br />