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AIRPORT MASTER PLAN
<br />TABLE 4-21
<br />APRON SPACE REQUIREMENTS
<br />SAN MARCOS REGIONAL AIRPORT
<br />Surplus/
<br />Peak Estimated Weighted Total Deficiency
<br />Month Percentage Average Estimated Long-Apron Based on
<br />Average OPS on Aircraft Parking Aircraft Term Tie-Area Current Current
<br />Day Apron at Parking Apron Circulation Down Required Apron Apron Size
<br />2222
<br />Year (PMAD) Same Time Area (ft) Required Factor Aircraft (ft) Area (ft) (ft)
<br />2018 237 50.00% 6,805 806,393 483,836 82,500 1,372,728 2,498,300 1,125,572
<br />PAL 1 216 50.00% 6,805 734,940 440,964 83,600 1,259,504 2,498,300 1,238,796
<br />PAL 2 258 50.00% 7,012 904,548 542,729 87,500 1,534,777 2,498,300 963,523
<br />PAL 3 296 50.00% 7,220 1,068,560 641,136 93,400 1,803,096 2,498,300 695,204
<br />PAL 4 333 50.00% 7,480 1,245,420 747,252 98,500 2,091,172 2,498,300 407,128
<br />PAL 5 368 50.00% 7,635 1,404,840 842,904 104,200 2,351,944 2,498,300 146,356
<br />Source:Garver, 2019
<br />Note:An assumption was made that no more than 50% of the total number of estimated itinerant operations during
<br />the PMAD would be on the ramp at the same time. The estimated parking apron required was calculated by multiplying
<br />the PMAD by the forecasted percentage of itinerant operations, then multiplying that result by the estimated
<br />percentage of itinerant operations on the apron at the same time, and then multiplying that result by the weighted
<br />average aircraft parking area. A factor of .6 was added to the apron space calculation to account for general aircraft
<br />circulation and movement.
<br />These calculations show that the existing apron space will be sufficient for the
<br />duration of the planning period. Since pavement condition is a significant concern
<br />regarding the ramp, the alternatives analysis will identify portions of the main ramp
<br />that could potentially be temporarily closed in an effort to reduce the amount of
<br />pavement that has to be maintained.
<br />Apron Lighting
<br />Based on feedback from airport stakeholders, the main ramp area is too dark at
<br />night. Additional lighting will be a consideration in the alternatives analysis process.
<br />Light pollution from the Gary Job Corps facility contributes to this issue.
<br />Fuel storage requirements are based on the forecast of annual operations, aircraft
<br />utilization, average fuel consumption rates, and the forecast mix of GA aircraft
<br />anticipated at the San Marcos Regional Airport. On average, the typical single-
<br />engine airplane consumes 12.0 gallons of fuel per hour and flies approximately 100
<br />nautical miles (1.0 to 1.5 hours) per flight. Turbine aircraft generally will fly greater
<br />Facility Requirements Chapter Page 66 of 70
<br />October 2020
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