Proposal for New Executive Board Member ARCADIS.

ARNHEM, The Netherlands -- ARCADIS (NASDAQ: ARCAF, EURONEXT: ARCAD), an international consulting and engineering company, announced today that the Supervisory Board proposes to the Annual General Meeting of Shareholders, to be held on May 17, 2006, to appoint Ben van der Klift (46) as member of the Executive Board of ARCADIS NV. Within the Board, Mr. Van der Klift will fulfill the role of Chief Financial Officer. After his appointment and that of Friedrich Schneider who has also, as previously announced, been proposed for appointment, the Executive Board will consist of the following four members: Harrie L.J. Noy, CEO; C. Michiel Jaski; Friedrich Schneider; Ben A. van der Klift, CFO.

Mr. Van der Klift has worked for ARCADIS since 2004, and became Financial Director in January 2005. Mr. Van der Klift is a Dutch national. Before coming to ARCADIS he was Director of Finance for PRC BV, a company that has been part of ARCADIS since 2003. Mr. Van der Klift has a broad education in civil infrastructure, a degree in Social Geography, a Master of Business Administration degree, and education for corporate controllers at Vrije Universiteit Amsterdam. He began his career at De Rotterdamsche Droogdok Maatschappij in Rotterdam as head of its Economic Department. After that, he worked for DHV as controller for several operating companies. From 1997 to 2004 he was Financial Director for PRC.

Given his long-term and strong background in financial management and experience in ARCADIS' field of activities, and because of his performance as Financial Director of ARCADIS NV in the past period, the Supervisory Board of ARCADIS is of the opinion that Mr Van der Klift's profile fits for this position and that he will deliver the desired contribution as Chief Financial Officer within the Executive Board.

ARCADIS is an international company providing consultancy, engineering and management services in infrastructure, environment and facilities, to enhance mobility, sustainability and quality of life. ARCADIS develops, designs, implements, maintains and operates projects for companies and governments. With more than 10,000 employees and over EUR 1 billion in gross revenue, the company has an extensive international network that is supported by strong local market positions.

Except for historical information contained herein, the statements in this release are forward-looking statements that are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements involve known and unknown risks and uncertainties that may cause the company's actual results in future periods to differ materially from forecasted results. Those risks include, among others, risks associated with possible changes in environmental legislation and risks with regard to the Company's ability to acquire and execute projects. These are other risks are described in ARCADIS' filings with the Securities and Exchange Commission over the last 12 months, copies of which will be available from the SEC or may be obtained upon request from the Company.