Tetra Tech, Inc. (NASDAQ: TTEK), a leading provider of high-end consulting and engineering services in water, environment, and sustainable infrastructure, announced today that the City of Los Angeles Harbor Department has selected the company for a three-year master services agreement to provide environmental engineering and technical services for the Port of Los Angeles (POLA). POLA is the nation's busiest seaport in the western Hemisphere and is undertaking a multi-year, $2.6 billion infrastructure investment program.