company determines the provision for the said loss on impairment of the investment. For your kind acknowledgement. Yours Faithfully, HYDROTEK PUBLIC COMPANY LIMITED Mr. Sarun Yanasopananan Chief Executive

securities business receivable of Baht 10.06 million. Please kindly be informed accordingly. Yours sincerely, (Mr. Chaipatr Srivisarvacha) Chief Executive Officer

. Please be informed accordingly. Sincerely yours, Miss Pimkarn Leungsuwan Chief Financial Officer

group 733.46 678.37 Water management business group (only amount recognize in year 2018) 137.49 67.53 Total 870.95 745.90 Yours Truly, WIIK & HOEGLUND PUBLIC CO., LTD. Mr. Wiboon Sangwithayanon Chief

informed accordingly. Sincerely yours, (Mrs. Klinsukhon Luephongphaichit) Chief Financial Officer

agreements of Baht -0.3 million Please be informed accordingly. Sincerely yours, (Ms. Huai Hui, Lee) Chief Operating Officer

accordingly Yours sincerely, (Mr. Chalerm Harnphanich M.D.,Ph.D.) Chief Executive Officer

Chief Executive Officer

) Mr.Pairoj Wattanavarodom Position Director 5) Mr. Somchai warunpantulak Position Director 4. Appointing Mr. Pongsak Sawatyanon to be the Deputy Chief Executive Officer Effective Date on June 14,2018 Please be

under the Rule for Acquisition and Disposition of Assets of Listed Companies. Yours sincerely, -signed- (Mr. Chaiwat Kovavisarach) President and Chief Executive Officer Investor Relations Division Tel. 0