Contract Signing of the Construction of Highway No.7

ST. 010/2006/0041 May 30th, 2006 Subject: Contract Signing of the Construction of Highway No.7 (Suvarnabhumi Airport - Chonburi) (Phase 5) Project Attention: The President The Stock Exchange of Thailand Sino-Thai Engineering & Construction Public Company Limited is pleased to inform the SET that the company has signed new contract which has details as follow: Project name : Highway No.7 (Suvarnabhumi Airport - Chonburi) (Phase 5) Project (Contract No.Sor.Tor.2/41/2549 dated on 29th May 2006) Project owner : Department of Highways Contract value: THB 566,543,600 (Include VAT) Scope of work: the construction of highway from Km.65-502 to Km.78-525 including the intersection of highway no.7 (former 36) Km.0-300 to Km.2-010, and electrical installation approximately 14.733 kilometers long. Construction period : 600 days (the project is scheduled to commence after the signing date.) 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