Sign contract of Drainage System for Suvarnabhumi Airport

ST. 010/2006/0021 March 20th, 2006 Subject: Contract Signing of the Construction of Drainage System for Suvarnabhumi Airport Area Phase 3, Samutprakarn province Project Attention: The President The Stock Exchange of Thailand Sino-Thai Engineering & Construction Public Company Limited is pleased to inform the SET that on March 20th, 2006, the company, by the name of S.L. Joint Venture has signed new contract, which has details as follow: Project name : The Construction of Drainage System for Suvarnabhumi Airport Area Phase 3, Samutprakarn province, Project Project owner : Royal Irrigation Department Contract value: THB 2,870,275,000 (Incl. VAT) Scope of work: Drainage canal with 1.82 Km. length, pump station, elevated flume and associated buildings. Construction period : 780 days % of Shareholding for STEC : Sino-Thai Engineering & Construction Plc. has 70% stake in the Joint Venture. Scope of work for STEC : Sino-Thai Engineering & Construction has work from the joint venture for the amount of 2,841,572,250 Baht (Incl.VAT) It is therefore informed for your acknowledgement and dissemination to the public and other investors. Yours sincerely Mr. Woraphant Chontong SEVP. Financial and Administration Division