Darci, I think we need to draft something to send out to our tenants and users regarding completion of this first phase (FWD and RDD) of pavement testing and alerting them to the next step, which is boring holes to take core samples. We need to write up something to incorporate the following points: * $1,137,000 (FY09) grant from FAA / TX-DOT Aviation for design and engineering work to rehabilitate Runway 15/33 * Town of Addison / Airport share of project cost is 5% ($68,500) * Improvements will include (if needed) runway base course repairs; a full-length asphalt overlay; drainage and grading improvements in the lateral runway safety areas (RSAs); remove VASI on Runway 15 and replace with PAPI; install PAPI on Runway 33; upgrade runway edge lighting to High-Intensity Runway Edge Lights (HIRLs); install additional runway holding position signs; upgrade runway lighting circuits with new cables, conduits, and regulators. * Survey work covering 250 feet on either side of the runway centerline and 200 feet beyond each runway end has been ongoing for the past 4 weeks; the survey work is using a laser scanner, which allows surveying of the runway and taxiways without the need to get on the pavement … this means we do not have to close the runway to do the surveying. * Overnight closures from Tuesday 9/8 through Friday 9/11 were needed to perform evaluations of pavement load-bearing capacity and identify weak spots in the runway. * Two methods of non-destructive pavement strength evaluation were used: traditional Falling Weight Deflectometer (FWD) measurements were performed by Fugro, and a new technology called Rolling Dynamic Deflectometer (RDD) was employed by a team from the University of Texas. The FWD measurements are taken at discrete points every 100 feet on the runway, while the RDD takes continuous measurements as it travels down the runway at a speed of about 1 mph. Thus, RDD provides much higher-resolution data than FWD and has the potential to replace FWD in much the same way that laser scanning survey techniques are replacing more traditional (including GPS / backpack) survey methods. The RDD technology is very new, and Addison is the first major runway rehabilitation project where it has been used. The use of both techniques has been facilitated by TX-DOT Aviation and will provide more quality assurance for our runway project. * The next step in this process (after the FWD and RDD data have been analyzed) will be to drill some holes in the runway to get core samples of the pavement in selected locations. We anticipate boring 8-10 holes probably 16-20 inches deep. This work will again require some overnight runway closures, beginning the night of Monday 9/28. We expect to require two or possibly three nights to complete this work. Operations Manager Joe McAnally will be contacting our FBOs and cargo operators to coordinate closure times. As always, we appreciate your patience with these closures and will continue to work with our tenants and users to minimize the disruption to your operations. If we can get this out within the next couple of days, that would be good. And just FYI, Boo Nam (in case you were wondering from Frank McIllwain’s e-mail, below) is the name of the guy from UT who was running the RDD data collection. I don’t think we need to mention that to our tenants, though. Thanks, Joel _____ From: Mcanally, Joe Sent: Monday, September 14, 2009 9:49 AM To: Jenkinson, Joel; Foster, David; ncline@addisontx.gov Subject: FW: RDD testing complete Joe McAnally Operations Manager Addison Airport (972) 392-4861 _____ From: McIllwain, Frank O. [mailto:FOMcIllwain@GarverUSA.com] Sent: Monday, September 14, 2009 9:48 AM To: Mcanally, Joe Subject: RDD testing complete Joe: I talked to Boo Nam - he said they finished testing on Friday night. Frank McIllwain, PE Senior Project Manager Transportation Team Leader Office: 972-377-7480 Ext: 222 Mobile: 214-250-3967 E-mail: FOMcIllwain@GarverUSA.com