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AIRPORT MASTER PLAN <br />CRJ 200 LRand whether the mid-size to large corporate aircraft using the airport <br />begin flying longer stage lengths. If these operations come to fruition, increases in <br />runway length will likely be necessary. <br />Runway Length Analysis Conclusions <br />Based on the results of this runway length analysis, a runway extension should be <br />planned for to ensure that property and airspace are protected for a future runway <br />extension. The primary runway that should be protected for this purpose is Runway <br />17/35 due to its wind coverage. As a result, it is recommended that the alternatives <br />process evaluate the feasibility of extending Runway 17/35 to 7,000 ft. <br />FAA AC 150/5320-6E, Airport Pavement Design and Evaluation, provides guidance on <br />the structural design of airport pavements. The FAA requires the use of the <br />pavement design program, FAARFIELD, to determine the pavement section that will <br />support the various aircraft gear loadings the pavement is expected to support. The <br />design is based on a 20-year pavement life cycle. To establish the required <br />pavement section, FAARFIELD analyzes the damage to the pavement done by each <br />aircraft and determines the final pavement thickness/structure based on the total <br />cumulative damage of all aircraft. <br />The runway pavement strength for each of the runways at the San Marcos Regional <br />Airportis shown in Table 4-6, Existing Runway Weight Bearing Capacity. <br />TABLE 4-6 <br />EXISTING RUNWAY WEIGHT BEARING CAPACITY <br />SAN MARCOS REGIONAL AIRPORT <br />Weight Bearing Capacity (pounds)Runway 8/26Runway 13/31Runway 17/35 <br /> Single Wheel Gear (SWG)38,50023,00028,000 <br /> Double Wheel Gear (DWG)56,500-43,500 <br /> Dual Tandem Wheel (DTW)106,000-- <br /> <br />Source: Pavement strength numbers shown above are from a memo from Fugro USA Land, Inc. to KSA <br />Engineers, Inc. dated February 7, 2019 discussing the structural capacity of the runways. Furgo USA Land, <br />Inc. performed a pavement structural capacity evaluation for the airport in 2015. The pavement strength <br />figures shown in the report differ from the figures currently shown in the current FAA Form 5010 and on <br />the previous Airport Layout Plan. <br />Facility Requirements Chapter Page 9of 70 <br />October 2020 <br /> <br />