ARNHEM, The Netherlands, July 6 /PRNewswire/ --     ARCADIS (EURONEXT: ARCAD), the international consulting and engineering
company, today announced that it has acquired 100% of the shares of privately
held RTKL Associates Inc, one of the world's leading design and planning
firms, headquartered in Baltimore, Maryland, United States. With about 1050
professionals, RTKL provides architectural design, master planning and
specialized engineering services from 6 offices across the United States
(Baltimore, Washington, Chicago, Dallas, Los Angeles and Miami) and from
offices in London, Madrid, Shanghai and Tokyo. The company had 2006 gross
revenues of US$195 million and net revenues of US$142 million. Normalized
operating margins fit within ARCADIS' target for the facility segment. The
transaction is expected to be immediately accretive to earnings per share.
Further financial details were not disclosed.

Established in 1946, RTKL has experienced strong growth in the last five
years, expanding the practice into new geographies and business lines,
including technology-focused services. The company ranks among the top ten
architectural design and planning firms in the world and has a well
diversified international portfolio of award-winning work across the
commercial, health, workplace and civic markets in some 50 countries. The
company has been involved in many high profile projects including LA Live
surrounding the Staples Center in Los Angeles, the Baltimore Waterfront
Redevelopment and the Shanghai Science and Technology Museum in China. RTKL's
master planning services provide an early entry into major urban development
programs. The specialty services include design and engineering for
high-security buildings and for public and private healthcare facilities as
well as structural, mechanical and electrical engineering.

ARCADIS CEO Harrie Noy said: "The merger with RTKL is a milestone for
ARCADIS, as it adds high quality design and master planning services that
provide distinguishing value to clients. This allows us to build a leadership
position in the facility segment and to participate more in large private and
public sector property investments across the world. Together we offer a full
range of services: planning, design, program and cost management, property
consulting and specialized engineering, separately or as an integrated
package assuming overall responsibility for projects. Our strong positions in
the infrastructure and environment sectors provide additional strength to an
integrated offering, with the capability to deliver globally. Finally, RTKL's
world class brand, based on consistent quality and high profile projects,
will substantially enhance ARCADIS reputation and visibility. We are proud
that RTKL has joined ARCADIS."

"This relationship fulfills a number of our key strategic goals," said
David C. Hudson AIA, RTKL President and CEO. "It not only expands our
presence in critical geographies, allowing us to attract world-class clients
and world-class talent, but it gives us the resources to define the next
generation of the global architecture and design practice."

Paul Jacob AIA, RTKL Chairman added: "As large-scale development becomes
more complex and more reliant on multi-disciplinary and sustainable
approaches, this partnership merges our expertise in the built environment
with ARCADIS' expertise in front-end environmental services, infrastructure
and program management. Our clients seek comprehensive, holistic solutions
that demand vision, talent and the latest technology. Now, as part of the
ARCADIS network, we offer one of the deepest pools of professional services
in the world."

About ARCADIS:

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 11,000 employees and over EUR1.2 billion in gross
revenue, the company has an extensive international network that is supported
by strong local market positions. More information can be found at
www.arcadis-global.com

About RTKL:

RTKL is a worldwide architecture, engineering, planning and creative 
services organization. Founded in 1946, the firm specializes in providing its 
services  across the full development cycle to create places of distinction. 
With projects around the globe, RTKL is an idea-driven firm providing 
innovative customized business solutions and seamless delivery to clients in 
commercial, cultural, and governmental realms. More information can be found 
at www.rtkl.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, the risk that our delisting from NASDAQ and subsequent deregistration
with the SEC will not become effective as currently anticipated, risks
associated with possible changes in environmental legislation and risks with
regard to the Company's ability to acquire and execute projects. These and
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.

A conference call for financial analysts will be held on Monday, July 9
at 15:00 hours Central European Time. This call will be webcast live and is
accessible to the public via the investor section of the ARCADIS website:
www.arcadis-global.com.

PRN NLD