Denver, Colo  – Dec. 6, 2006 – ARCADIS (NASDAQ: ARCAF, EURONEXT: ARCAD) is proud to announce that Evan Nyer will deliver a commemorative address today, "20 Years of Writing Treatment Technology," at the National Ground Water Association (NGWA) Ground Water Expo in Las Vegas, Nevada.

Nyer, senior vice president with ARCADIS, an international environmental engineering and consultancy firm, is responsible for maintaining and expanding technical expertise in geology, hydrogeology, engineering, fate and transport, and remediation technologies. Having strategized and designed over 400 groundwater and soil remediation projects throughout the United States, authored five books, lectured, and provided expert testimony, Nyer is considered an expert in his field. 

For the past 20 years, Nyer's column, Treatment Technology, has appeared in Groundwater Monitoring and Remediation magazine, currently in its 26th year of publication. Known for his light and amusing writing style, Nyer's ability to transform technical material into easy reading has contributed to the popularity of his column and the establishment of the magazine as "a standard in the remediation community," wrote Thad Plumley, NGWA Director of Publications, in the Spring 2006 issue. "[Evan] has covered topics as they were emerging … and provided keen insight on numerous subjects that affect the ground water profession." To read Nyer's articles, visit Ground Water On-Line at www.ngwa.org.

The NGWA (formerly National Water Well Association), a non-profit organization founded in 1948, is dedicated to advancing the expertise of all ground water professionals and furthering ground water awareness and protection through education and outreach. Current membership exceeds 14,000. This year's NGWA Expo, Dec. 5-8 in Las Vegas, offers panel discussions, workshops, hands-on training and an exhibit hall showcasing the newest products and technologies in the ground water industry.

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 $1 billion in gross revenue, the company has an extensive international network that is supported by strong local market positions.