On May 30, 1997, Tetra Tech EM Inc. (Tetra Tech) received Work Assignment No. R09107 from the U.S. Environmental Protection Agency (EPA) Region 9, under Contract No. 68-W-02-021, Resource Conservation and Recovery Act Enforcement, Permitting, and Assistance, Zone III. Tetra Tech was tasked to perform an independent evaluation of the process used to assess the radiological status of Buildings T-012, T-023, T-028, T-029, and T-363 at the Boeing-Rocketdyne (Rocketdyne) Santa Susana Field Laboratory in Santa Susana, California.
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