Tetra Tech, Inc. (TTEK) has secured an extended One Acquisition Solution for Integrated Services (OASIS+) contract for broad service areas from the Government Services Administration (GSA). Financial terms of the deal were kept under wraps.Per the five-year, multiple-award Indefinite Delivery Indefinite Quantity contract, TTEK has been chosen for various technical service areas to support federal agencies. These include management, research, engineering, environmental, facilities, intelligence and logistics ...