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IML <br />Apron 1 <br />Apron 1 is an open tie -down parking apron composed of an asphalt surface. The <br />apron contains 24 tie -downs. <br />Prior to being an apron, Runway 9/27's alignment traversed the apron, but at an <br />angle. The runway was removed sometime before 1978 and it is unclear if any of the <br />runway's foundation was used for the apron. <br />The apron was seal coated in 2008 with a thermoplastic coal -tar sealer (then-EB35), <br />which was known as "Grip -Flex". The grip -flex surface is still in place and the <br />aggregate within the seal coat is still providing a friction surface. However, the <br />pavement has significant block cracking that is reflected through the grip -flex. The <br />apron has locations of depressions that are holding water (birdbaths) that is likely <br />accelerating the cracking of the surface as the water penetrates the cracks and <br />weakens the underlying pavement support. <br />The large amount of cracking on the apron prevented the individual crack counting <br />and instead was sampled. A 50-foot square sample box was determined along the <br />centerline of the apron and was used to represent the average condition of the entire <br />apron. Within this sample box, 205 feet of block cracking was counted. Extrapolating <br />this rate to the entire apron, results in 9,200 feet of block cracking on the apron. <br />Apron 2 <br />Similarly, Apron 2 is <br />also an open tie -down <br />parking apron that is <br />flanked on the west <br />side by the pipeline <br />corridor, with three <br />connectors crossing <br />the corridor to Apron 3. <br />The apron has 34 tie - <br />downs. <br />The apron is an asphalt <br />pavement surface that <br />also was seal coated in <br />2008 with grip -flex. The <br />surfacing is also still in FIGURE 5 - APRON 2 BLOCK CRACKING <br />place and, like apron 1, <br />the pavement has significant block cracking that is reflected through the grip -flex. <br />The apron has locations of birdbaths and some areas of grass vegetation growing in <br />the cracks. <br />Like Apron 1, the large amount of cracking on the apron prevented the individual <br />crack counting and instead was sampled. Again a 50-foot square sample box was <br />determined within the apron that was representative of the average condition of the <br />Page 113 <br />