Tetra Tech Sciences practices in the areas of biostatistics, ecological risk assessment, epidemiology, reproductive and endocrine health and toxicology. The company s projects in biostatistics include analysis of animal toxicology data using the latest statistical methods and software, regression and epidemiologic studies. Its professionals have expertise in environmental, civil, and chemical engineering, geology, chemistry industrial hygiene, and biostatistics and develop and implement plans for site investigations. Tetra Tech Sciences has also performed a variety of toxicological and chemistry assessments for the United States Food and Drug Administration, including food safety.