PASADENA, Calif.--(BUSINESS WIRE)--Tetra Tech, Inc. (NASDAQ: TTEK) today announced the planned dates for its third quarter 2015 results and conference call. On Wednesday, July 29, 2015, after market close, Tetra Tech intends to announce its third quarter 2015 results. On Thursday, July 30, 2015, at 8:00 a.m. Pacific Time, Tetra Tech plans to host a conference call to further present and discuss the Company’s financial results and forward outlook. Investors and other interested parties can acces