Exhibit 10a


 


INFORMATION ON
MEMBERS OF THE SUPERVISORY BOARD, EXECUTIVE BOARD, STAFF DIRECTORS, AND OTHER
MEMBERS OF THE SENIOR MANAGEMENT COMMITTEE


 


SUPERVISORY  BOARD


 


Professor Luck M. van Leeuwen Ph.D. (1933),
Chairman


Audit Committee, Selection and
Remunera-tion Committee, Integrity Committee


Dutch nationality


Term 1991-2004


Current position: Professor at
University of Brabant


Previous positions:


Chairman Executive Board
Assurantieconcern Stad Rotterdam anno 1720 (1979-1994)


Member Netherlands Senate (1987-1999)


Non-executive board functions:


• Berenschot Holding N.V.


• Betonson Beheer N.V.


• International Advisory Board Fortis


• Colonnade N.V.


• Van Nieuwpoort Beheer N.V.


• Advisory Board Instituut voor Bedrijfskundigen (IBO)


• Arenthals Grant Thornton, Accountants and tax advisors


• Foundation Economic Cooperation Netherlands and
Emerging Countries (SENO)


• Foundation Administration Office Shares Royal Volker
Wessels Stevin N.V.


 


Carlos Espinosa de Los Monteros (1944)


Selection and Remuneration
Committee


Spanish nationality


Term 1998-2006


Current position: Chairman and
CEO Mercedes Benz España S.A. and DaimlerChrysler España Holding


Previous positions:


Chairman IBERIA Airlines
(1983-1985)


Non-executive board functions:


• Acciona S.A.


• Inditex S.A. (Zara)


• Gonzalez Byass S.A.


 


André A. van der
Louw (1933)


Integrity Committee


Dutch nationality


Term 1986-2004


Previous positions:


Chairman Dutch National
Broad-casting Corporation


Member Dutch Parliament
(1970-1971) and (1982-1983)


Minister of Culture, Recreation
and Social Work (1981-1982)


Mayor City of Rotterdam
(1974-1981)


Non-executive board functions:


• Stadion Feijenoord


 


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Jan Peelen M.Sc. (1940)


Selection and Remuneration
Committee


Dutch nationality


Term 2000-2004


Previous positions:


Member Executive Committee
Unilever


Several management positions
within Unilever or subsidiary companies thereof


Non-executive board functions:


• Albron BV


• Friesland Coberco Dairy Foods


• Buhrmann NV


• VVAA Group BV


• Wageningen University and Research Centre


• National Regie-Orgaan Genomics


 


Ross A. Webber Ph.D. (1934)


Audit Committee


U.S. nationality


Term 1993-2006


Current position: Emeritus
Professor Wharton School of University of Pennsylvania.


Previous positions:


Vice President University of
Pennsylvania (1981-1986)


Chairman Management Department
Wharton School (1991-1995)


Non-executive Board functions:


• American Water Works Co., Inc.


• New Jersey-American Water Company


 


Rijnhard W.F. van Tets (1947)


Audit Committee


Dutch nationality


Term 2002-2006


Current position: Advisor to
the Executive Board of ABN AMRO Bank (2002)


Previous positions:


Banque Europeenne de Credit
(Brussels) and Societe Generale (Paris) (1973-1975)


Sogon Swiss and First Boston
Corporation (New York: 1975-1983)


Member of the Executive Board
of ABN AMRO Bank (1988-2002)


Non-executive Board functions:


• International Securities Market Association (Chairman)


• Foundation Holland Casino


• Reliant Energy Europe B.V.


• Wegener N.V. (Chairman)


• Foundation Company Pensionfund Building Industry
(Chairman)


• Foundation Verenigd Bezit


• Foundation Kasteel de Haar


 


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EXECUTIVE BOARD


 


Harrie L.J. Noy M.Eng. (1951), Chairman


Dutch nationality


Current position: Chairman
Executive Board since 2000


Previous positions:


Worked for ARCADIS in various
(management) positions throughout his career, most recently as Member Executive
Board


Non-executive board functions:


• Civieltechnisch Centrum Uitvoering Research en Regelgeving
(CUR)


• Foundation Habiforum


• Executive Board VNO-NCW


• Advisory Board Euronext


• Dutch-German Chamber of Commerce


 


Steven B. Blake M.Sc.Hydrology (1956)


U.S. nationality


Current position: Member
Executive Board since 1999


Previous positions:


Before joining ARCADIS, held
positions at Spill & Tank Management and Engineering Enterprises


Non-executive board functions:


• Construction Industry Roundtable


• U.S. National Water Well Association


• Federal Relations Committee – CIRT


 


C. Michiel Jaski M.Sc.Hydrology (1959)


Dutch nationality


Current position: Member
Executive Board since 2000


Previous positions:


Before joining ARCADIS, held
positions at Shell and Philips


 


Jan Zijlstra M.Eng. (1946)


Dutch nationality


Current position: Member
Executive Board since 1999


Previous positions:


Worked for ARCADIS in various
(management) positions throughout his career, most recently as managing
director ARCADIS Bouw/Infra


Non-executive board functions:


• ONRI – Organization for Consulting and Engineering
Firms


• Foundation Toekomstbeeld der Techniek


• Foundation P3&BI


• Railforum


• Foundation KNHM


 


STAFF DIRECTORS


 


Hans van Dord
M.Eng. (1944)


Dutch nationality


Director Corporate Development
since 2000


 


Henk W.M.W. ten Cate RA (1953)


Dutch nationality


Corporate Director Finance
since 2001


 


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Wim G.M. Rupert
M.Sc. (1945)


Dutch nationality


Director Human Resources since
1994


 


Craig E. Eisen
M.Sc. (1951)


U.S. nationality


Director Mergers and
Acquisitions since 2002


 


MEMBERS OF THE SENIOR MANAGEMENT COMMITTEE


 


Joe A. Hastey (1948)


U.S. nationality


CEO ARCADIS G&M 1999


 


Yann Leblais
M.Eng. (1952)


French nationality


CEO ARCADIS FCI 2000


 


Erhard Robold Dipl.-Ing. (1956)


German nationality


CEO ARCADIS Deutschland 1998


 


Antonio Rocha (1941)


Brazilian nationality


CEO ARCADIS Logos 1999


 


Rein J. Sirre
M.Sc. (1942)


Dutch nationality


Managing Director ARCADIS
Nederland 2000


 


Kees T.
Slingerland M.Sc. (1960)


Dutch nationality


Managing Director ARCADIS
Nederland 2000


 


Ludo Smans (1947)


Belgian nationality


Managing Director ARCADIS
Belgium 1995


 


Luis Valenzuela M.Sc. (1943)


Chilean nationality


CEO ARCADIS Geotecnica 1989


 


Luis Villarroya M.Sc. (1953)


Spanish nationality


CEO Grupo EP 1999


 


Simon P. Warmerdam M.Sc. (1950)


Dutch nationality


Managing Director ARCADIS
Euroconsult 2000


 


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