 PASADENA, Calif.--BUSINESS WIRE--Tetra Tech, Inc. NASDAQ: TTEK, a leading provider of high-end consulting and engineering services, announced today the planned dates for its second quarter 2021 results and conference call. On Wednesday, April 28, 2021, after market close, Tetra Tech intends to announce its second quarter 2021 results. On Thursday, April 29, 2021, at 8:00 a.m. Pacific Time, Tetra Tech plans to host a conference call to present and discuss the Companys financial results and 