ARCADIS Scientists Co-Edit the Third Edition of The Water Encyclopedia.

DENVER -- ARCADIS (NASDAQ: ARCAF) (EURONEXT: ARCAD), the international consulting and engineering company, announced that two of its scientists co-edited the third edition of "The Water Encyclopedia: Hydrologic Data and Internet Resources." The first edition of the book was published in 1970. For more than 35 years ARCADIS has been an integral part of keeping hydrologic data accurate and up-to-date.

Whether you are looking for a specific piece of information or exploring many topics, this edition is a portal to quality facts and data sets. Retaining the elements that made the previous editions bestsellers, the third edition elucidates the many changes within the environmental industry and in water-related issues during the last decade. Prepared by scientists and engineers, the book has been significantly expanded beyond the scope of the second edition.

The book addresses the accessibility, usability, content, quality and general characteristics of data sets on the Internet. The new edition contains more than 1,100 tables and 500 figures providing data related to weather, surface water, ground water, water use, water quality, waste water, pollution and water resource management. New features of the third edition include a chapter discussing metadata and the role of the Internet in accessing data sets as well as appropriate hyperlinks throughout the text.

ARCADIS is an international company providing consulting, 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 11,000 employees and over $1.5 billion in gross revenue, the company has an extensive international network that is supported by strong local market positions. Please visit our website at www.arcadis-us.com.

ARCADIS Co-editors:

Pedro Fierro, Jr. - associate vice president; Pedro Fierro at 813-903-3122 or [e-mail]

Pedro Fierro, Jr., hydrogeologist, is involved with a wide variety of environmental assessments and remediation programs. He has been responsible for the direction of several hundred sites addressing environmental issues. Fierro has addressed various audiences on topics ranging from sampling methodologies, regulatory compliance, site assessment techniques, liability management, and remediation technologies. He received his bachelor's degree in geology from the University of Rochester, Rochester, NY, and his master's degree from the University of Kentucky in Geology with an emphasis on groundwater studies. He currently holds geological professional licenses/registrations in Florida, Georgia, Alabama, Kentucky, Tennessee, and Pennsylvania. He is a Certified Ground Water Professional and a Certified Professional Geologist. He was a contributing author to In Situ Treatment Technology.

Evan K. Nyer - senior vice president; Evan Nyer at 813-903-3122 or [e-mail]

Evan Nyer has been active in the development of new treatment technologies for more than 25 years. He has been responsible for the strategies, technical design and installation of more than 400 groundwater and soil remediation systems at contaminated sites throughout the United States. Mr. Nyer also lectures, provides expert testimony and serves as the public spokesperson for one technically complicated site.

Nyer received his graduate degree in environmental engineering from Purdue University and has authored five books: Practical Techniques for Groundwater and Soil Remediation, published by Lewis Publishers, Inc.; Groundwater Treatment Technology, first and second edition, published by Van Nostrand Reinhold; Groundwater and Soil Remediation, and In Situ Treatment Technology (now in its second edition) published by CRC Press; and co-author of Bioremediation, published American Academy of Environmental Engineers. Nyer is a regular contributor to Groundwater Monitoring and Remediation having had his own column "Treatment Technology" in the periodical for the past 20 years.