Arcadis NV — Environmental & Social Information 2010

Oct 21, 2010

ARCADIS NV Nieuwe Stationsstraat 10 P.O. Box 33 6800 LE Arnhem The Netherlands Tel +31 26 3778 292 Fax +31 26 4438 381 www.arcadis.com

Press Release

ARCADIS' STAFF ASSISTS WITH REBUILDING IN HAITI

October 21, 2010 – ARCADIS (EURONEXT: ARCAD), the international design, consulting, engineering and management services company, announced today that it will send a group of experts to Haiti to support UN-HABITAT, the United Nations Human Settlements Programme, in the reconstruction effort following the January 2010 earthquake.

A sanitation expert has already arrived in Port-au-Prince in late September to participate in an international sanitation mission. This trip follows ARCADIS' five-person reconnaissance mission earlier in the month, which included urban planners, architects and experts in potable water along with representatives from UN-HABITAT. A third mission with ARCADIS experts in flood protection management and civil engineering is planned for November. In addition, an architect/urban planner will be stationed in Haiti to support the local UN-HABITAT team.

These missions are part of the ARCADIS Shelter program, a partnership program with UN-HABITAT, aimed at improving the quality of life in rapidly developing cities around the world. Through Shelter, ARCADIS commits its staff members and expertise to supporting UN-HABITAT initiatives, including establishing a program for sustainably rebuilding cities in Haiti.

"We're proud to have the opportunity to collaborate with UN-HABITAT. Our skill sets match with the needs of UN-HABITAT in Haiti, allowing us to provide the type of expertise to support the reconstruction effort," said Harrie Noy, Chief Executive Officer of ARCADIS.

About Shelter

UN-HABITAT, the United Nations Programme for Human Settlements, and ARCADIS, have launched a partnership aimed at a common goal: to improve the quality of life in rapidly growing cities around the world. Under this partnership program, ARCADIS commits its employees, expertise and skills to help bring the UN-HABITAT agenda forward. The program is supported by the Lovinklaan Foundation which is a major shareholder in ARCADIS with particular interest in supporting the development of ARCADIS employees."

Shelter—the basic protection against the elements or just a safe place—is something we all need to survive. But, in many parts of the world, a growing number of people are not able to fullfill this essential human need. That's why we have given our initiative the name 'Shelter', creating a platform to make our partnership visible and tangible.

Get in touch with Shelter, the partnership of ARCADIS with UN-HABITAT via:

www.twitter.com/arcadisshelter

http://www.arcadis.com/Shelter.aspx

For more information and high resolution photographs please contact: ARCADIS NV: Mark Zellenrath, mobile +31650736265; e-mail: mark.zellenrath@arcadis.com

About ARCADIS:

ARCADIS is an international company providing consultancy, design, engineering and management services in infrastructure, water, environment and buildings. We enhance mobility, sustainability and quality of life by creating balance in the built and natural environment. ARCADIS develops, designs, implements, maintains and operates projects for companies and governments. With 15,000 employees and EUR 1.8 billion in revenues, the company has an extensive international network supported by strong local market positions. ARCADIS supports UN-HABITAT with knowledge and expertise to improve the quality of life in rapidly growing cities around the world. www.arcadis.com

About UN-Habitat:

UN-Habitat is the lead UN agency for housing and urban development. Its mandate is to promote public policy and public and private investment to make our cities and towns socially more inclusive, economically dynamic and environmentally sound. It is headquartered in Nairobi Kenya and has 400 core staff and up to 2,000 project staff at any given time. Visit us at: www.unhabitat.org