Contract Signing of the Improvement and Expansion Rungsit

ST. 010/2005/0073 August 22nd, 2005 Subject: Contract Signing of the Construction of the Improvement and Expansion Rungsit Waterworks (Nong-Sua-Lumsai) Tanyaburi district,Pratumtanee 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 18th August 2005, the Company signed contract of the Construction of the Improvement and Expansion Rungsit Waterworks (Nong-Sua - Lumsai) Tanyaburi district, Pratumtanee Province Project. The owner of the project is Provincial Waterworks Authority. The Company's scope of work includes pump house, sedimentation tank, storage tower, piping installation, automatic control system and related work. The construction period is 640 days. The value of the project is 480,000,000 Baht (Include VAT.). It is therefore informed for your acknowledgement and dissemination to the public and other investors. Yours sincerely Mr. Vallop Rungkijvorasathien President