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AIRPORT MASTER PLAN <br />-III category <br />during the forecast period, the width of the runways primarily used by C-III aircraft <br />would need to be expanded to 150 feet. Since the runways were all previously 150 <br />feet wide, there are no known factors that would limit the ability to expand the <br />runways back to 150 feet in width. <br />Runway Safety Area <br />The Runway Safety Area (RSA) is a two-dimensional area surrounding a runway that <br />is centered along the runway centerline and extends beyond the edges of the <br />useable runway pavement. provided to reduce the risk of damage to <br />airplanes in the event of an undershoot, overshoot, or excursion from the runway <br />pavement. RSAs must be free of objects, except those required for air navigation, <br />and be graded to transverse and longitudinal standards to prevent water <br />accumulation. Objects located in the RSA that are over 3 inches above grade must <br />be constructed, to the extent practical, on frangible mounted structures with the <br />frangible point no higher than 3 inches above grade. Under dry conditions, the RSA <br />must support Aircraft Rescue and Fire Fighting (ARFF) equipment (if applicable), <br />snow removal equipment, and the occasional passage of aircraft without causing <br />damage to the aircraft. <br />. Based on <br />RDC B-II design standards, the RSAs for Runways 8/26 and 17/35 should extend <br />beyond the end of the runway for 300 feet and be 150 feet wide (75 feet each side <br />of the runway centerline) with a grade not steeper than 3%. These standards are <br />met on both runways. Runway 13/31 has a C-II RDC. Consequently, the required <br />RSA for Runway 13/31 is 1,000 feet beyond the runway ends and 500 feet wide (250 <br />feet on each side of the runway centerline) with a grade not steeper than 3%. These <br />standards are met on Runway 13/31. <br />Since the Forecast Chapter identified that the San Marcos Regional Airport is <br />expected to move to the C-III RDC during the 20-year planning horizon, <br />improvements to the RSAs of one or more of the runways may be required. <br />Currently, the RSA dimensional standards for a runway with a C-III RDC are identical <br />to the standards for a Runway with a C-II RDC. Consequently, if Runway 13/31 is <br />moved from a C-II RDC to a C-III RDC, no improvements to the existing RSA for the <br />runway would be necessary. However, the RSA dimensional standards for a runway <br />with a B-II RDC (e.g. Runway 17/35 and Runway 8/26) are significantly smaller than a <br />Facility Requirements Chapter Page 15 of 70 <br />October 2020 <br /> <br />