Mr. Brewer, I am the Town Engineer for the Town of Addison, which owns Addison Airport here in the North Texas area. I am writing because a developer on the airport has requested to use a detention system that we have not previously approved, but I understand has been installed in your airport. The product is a corrugated metal pipe product produced by Contech. The engineer for the project was Fay Spofford and Thorndike out of Bedford, NH. Prior to permitting the installation of this product in Addison Airport, I wanted to confirm that it was used successfully on another airport under pavement. Can you confirm that this product was successfully installed in Manchester Airport under pavement, that it is functioning properly, and any other thoughts you may have about the product? Your assistance is greatly appreciated. Thanks, Clay Barnett, P.E. Town Engineer Town of Addison 16801 Westgrove Drive Addison, TX 75001-2818 Office: (972) 450-2857