Bill, I spoke with the officials at Manchester Airport. They are going to send the specifics on the material used for their drainage project. However, they did state that the product was not used under pavement so it does not appear that this installation mirrors that of the detention area at Million Air. Is there an installation in which the product was used under paving? Thanks, Clay Barnett, P.E. Town Engineer Town of Addison 16801 Westgrove Drive Addison, TX 75001-2818 Office: (972) 450-2857 From: LeggettInc@aol.com [mailto:LeggettInc@aol.com] Sent: Thursday, August 11, 2011 2:50 PM To: Clay Barnett Subject: Fwd: FW: Million Air - Addison, Contech CMP Underground Detention Submittal Good afternoon Clay. Here is the information you requested confirming the viabality of Contech Underground Detintion systems on airports in the United States.This example is on the Manchester Airport - Manchester, New Hampshire. It was installed in the fall of 2007. PLease let me know if you need anything more to approve use of this system on the Milllionair project. Thanks for your help. BILL LEGGETT WILLIAM LEGGETT ASSOCIATES 4600 Claire Chennault Suite 103 Addison, Texas 75001 Office 972 931 3010 Fax 972 931 3017 leggettinc@aol.com William.Leggett@sbcglobal.net