SET Announcements

Ref: CK-08-0000-PO-L-0063 July 21, 2008 Subject Signing the Supplementary Agreement Attention President The Stock Exchange of Thailand Reference is made to the fact that CH. Karnchang Public Company Limited has signed for the Supplementary Agreement with Airports of Thailand Public Company Limited as to perform the works for the Supplementary Agreement No. 1 to the Construction of Ground Improvement for the 1st Midfield Satellite Aprons and 3rd Runway for the Second Bangkok International Airport Project (Suvarnabhumi Airport). As such agreement is a normal business in conformity with the ordinary business conditions whereby the Company had ever entered into an agreement with the other companies as its details are the followings: Signing Date July 16, 2008 All cost of agreement Baht 272,421,396.- (VAT excluded) (Two Hundred Seventy Two Million Four Hundred Twenty One Thousand Three Hundred Ninety Six Baht only) For your information accordingly. Sincerely yours, =Signature= (Dr. Anukool Tuntimas) Executive Vice President Human Resource and General Administration