PASADENA, Calif.--(BUSINESS WIRE)--Tetra Tech, Inc. (NASDAQ: TTEK) today announced the planned dates for its second quarter 2015 results and conference call. On Wednesday, April 29, 2015, after market close, Tetra Tech intends to announce its second quarter 2015 results. On Thursday, April 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 a


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