FYI Corey Van Trease Principal Van Trease Development, Inc. 611 S. Main Street, Suite 400 Grapevine, TX 76051 Office (866) 304-7676 Fax (866) 304-7878 ________________________________ From: John Johnston Date: Tue, 27 Apr 2010 13:36:36 -0700 (PDT) To: Dan Claassen Cc: Jim Albertson; Subject: Subgrade Preparation Dan - Attached is a letter about subgrade preparation. I trust this approach will be acceptable to the City and to the FAA. We feel comfortable with it. Thanks, John John W. Johnston, P.E. Henley-Johnston & Associates, Inc. 235 Morgan Avenue Dallas, Texas 75203-1025 Texas Firm Registration No. F-1238 Phone: 214-941-3808 Fax: 214-943-7645 e-mail: jwjohnston-hja@sbcglobal.net