Nancy / Clay, Per Frank’s inquiry, do you have any soil borings or geotech reports for the shaded areas in the attached graphics? Except for the north RSA, I think the only borings we have are through pavements, but I will take a look. As I mentioned to Frank, we hit a lot of rock when the AWOS was installed; I think it’s definitely a concern. Regards, Joel Joel Jenkinson Director, Addison Airport main: (972) 392-4850 fax: (972) 788-9334 ________________________________ From: McIllwain, Frank O. [mailto:FOMcIllwain@GarverUSA.com] Sent: Monday, July 19, 2010 3:26 PM To: Jenkinson, Joel Cc: McAnally, Mitchell, R; Bible, Colin M.; Harry Lorton Subject: ADS Grading and Drainage - Past Soil Borings Joel: As we refine our RSA grading and drainage design, especially on the west side, I am becoming concerned that ditch excavation may encounter rock. Without soil borings, we can’t estimate the rock excavation. Do you have old geotechnical reports and/or soil boring logs for the areas shown on the attached exhibit? Frank McIllwain, PE Senior Project Manager Aviation Team Leader Office: 972-377-7480 Ext: 222 Mobile: 214-250-3967 E-mail: FOMcIllwain@GarverUSA.com