METAIRIE, La. – January 4, 2007 – Bioengineering Group and ARCADIS (NASDAQ: ARCAF) announced today that their team has been awarded an Indefinite Delivery Indefinite Quantity (IDIQ) contract to provide general design support services, multidisciplinary consultancy services and construction management services, primarily within the limits of the New Orleans District, by the New Orleans District of the U.S. Army Corps of Engineers (Corps). The team of Bioengineering Group and ARCADIS has joined with HNTB, Tetra Tech and C.H. Fenstermaker & Associates and will utilize support from Dutch WL Delft Hydraulics and Alkyon for specialized hydraulic expertise.
 
The contract includes a base period of one year and four option periods of one year each, with a maximum contract value of $150 million. The contract is the first one awarded related to forward-looking design services for post-Katrina solutions for hurricane protection in the Gulf Coast. Bioengineering Group and ARCADIS formed the team on the basis of their strong collaborative relationship, which is formalized through a Mentor-Protégé agreement approved by the U.S. Small Business Administration.

Steve Blake, CEO for ARCADIS' U.S. operations, stated, "I want to extend our commitment to the Corps and the people of Louisiana to provide dedicated professional flood protection expertise. We are looking forward to partnering with the Corps, Bioengineering Group and our talented teaming partners to provide these technical services. I am very pleased that we were selected for this noteworthy contract."

"We are pleased to have been selected for this landmark project," said Wendi Goldsmith, President of Bioengineering Group, Inc. "We have broad familiarity with the Gulf coast land, water, and people. We are committed to joining ARCADIS in providing state-of-the-art sustainable design, engineering and construction management services for this project."

Joe McGonagle, CEO of HNTB Federal Services Corp., a subsidiary of HNTB that serves federal-sector clients, said, "HNTB is proud to be a part of this world-class team to help restore this great American city. HNTB will dedicate its more than 50 yeas of experience in Louisiana and enormous national and technical expertise to help make this project a success."

Dan Batrack, Tetra Tech's CEO stated, "Our scientists and engineers have solved complex coastal protection and restoration problems nationwide and will bring these unique skills and experiences to Louisiana. We look forward to collaborating with the New Orleans District and our team members.
 
Services under this contract will be provided to the Hurricane Protection Office and the Protection Restoration Office of the New Orleans District. Anticipated project work will require a broad range of professional skills including overall program and construction management and include the evaluation, design and construction management of levees and floodwalls; special closure structures for protection of the communities adjacent to the Inner Harbor Navigation Canal; major pumping facilities; and planning studies for improved levels of flood protection for New Orleans and southern Louisiana. In addition to offering centrally controlled procedures and quality assurance systems, ARCADIS will share knowledge beyond national borders, saving costs and enhancing local expertise and flexibility and utilize standardized project monitoring tools displayed as a 'Project Control Panel' to enable the transparent monitoring of pre-determined measurable project objectives.
 
About the firms: 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 12,000 employees and $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.

The Bioengineering Group, Inc., (Salem, Massachusetts) an 8(a) woman-owned small business, provides a full range of consulting services related to integrating ecology, earth science, engineering, and landscape architecture. Its services include coastal protection, including wetland engineering; river management and flood control, including storm water management; and sustainable design, including green building technology. Please visit the website at www.bioengineering.com.

HNTB is an international infrastructure firm that offers comprehensive design, engineering and planning project and program management, construction management and architectural services to federal, state and local public and private clients. Nearly 3,000 professionals in more than 60 offices nationwide provide diverse services, including civil engineering, transportation engineering, security planning and military facility design on a national and international basis. For more information about HNTB Corporation, visit www.hntb.com.

Tetra Tech is a leading provider of consulting, engineering and technical services. With approximately 7,500 associates located in the United States and internationally, the Company supports commercial and government clients in the areas of resource management and infrastructure. Tetra Tech's services include research and development, applied science and technology, engineering design, program management, construction management, and operations and maintenance. Please visit www.tetratech.com.
C.H. Fenstermaker & Associates is a multidisciplinary consulting firm founded in 1950. The company's expertise includes engineering, surveying & mapping, and environmental consulting. Fenstermaker's offices are located in Lafayette, New Orleans, Baton Rouge, and Shreveport, Louisiana and Houston, Texas. www.fenstermaker.com.

For more information, contact:
Charles Leichner of ARCADIS U.S. at 602.438.0883 or cleichner@arcadis-us.com;
Wendi Goldsmith of Bioengineering at 978.740.0096 ext. 507 or wgoldsmith@bioengineering.com.
Barbara Pruitt of HNTB at 816.527.2347 or bpruitt@hntb.com
Mike Bieber of Tetra Tech at 626.351.4664 or mike.bieber@tetratech.com

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.