Geotechnical Engineering and Environmental Engineering
Carlos P. Da Silva, P.Eng.
e-mail: carlosd@patersongroup.ca

Materials Testing, Hydrogeology and Geological Engineering
Stephen J. Walker, P.Eng.
e-mail: swalker@patersongroup.ca

Building Science
Steven Laviolette, P.Eng.
e-mail: slaviolette@patersongroup.ca

Large Wastewater System Design
Andrew J. Tovell, P.Eng.
e-mail: atovell@patersongroup.ca

Wastewater and Water Treatment
Albert Van Schie, C.E.T.
e-mail: avanschie@patersongroup.ca

Head Office and Laboratory

28 Concourse Gate - Unit 1
Ottawa (Nepean), Ontario
Canada K2E 7T7

Tel: (613) 226-7381
Fax: (613) 226-6344

Northern Office and Laboratory

63 Gibson Street
North Bay, Ontario
Canada P1B 8Z4

Tel: (705) 472-5331
Fax: (705) 472-2334