X0306 4 2012-11-16 0000831641 TETRA TECH INC TTEK 0001277150 BURDICK STEVEN M 3475 EAST FOOTHILL BOULEVARD PASADENA, CA 91107 0 1 0 0 EXECUTIVE VICE PRESIDENT COMON STOCK 2012-11-16 4 A 0 220 0 A 19582 D COMMON STOCK 2012-11-16 4 A 0 6400 0 A 25982 D COMMON STOCK 2012-11-16 4 F 0 613 24.26 D 25369 D COMMON STOCK 2012-11-16 4 F 0 485 24.26 D 24884 D COMMON STOCK 2012-11-16 4 F 0 404 24.26 D 24480 D EMPLOYEE STOCK OPTION (RIGHT TO BUY) 24.26 2012-11-16 4 A 0 16000 0 A 2013-11-16 2020-11-16 COMMON STOCK 16000 152250 D RESTRICTED STOCK UNITS 0 2012-11-16 4 A 0 3200 0 A 2013-11-13 2016-11-13 COMMON STOCK 3200 155450 D In accordance with the Executive Compensation Policy, 120% of the installment vested on November 16, 2012 and 220 additional shares were issued to the reporting person. On November 16, 2012, 1,667 shares of restricted stock granted in November 2011 vested. Of the 1,667 vested shares, 613 shares were withheld to pay the related tax liability. On November 16, 2012, 1,100 shares of restricted stock granted in November 2010 vested. Of the 1,100 vested shares, 485 shares were withheld to pay the related tax liability. On November 16, 2012, 1,100 shares of restricted stock granted in November 2009 vested. Of the 1,100 vested shares, 404 shares were withheld to pay the related tax liability. The option becomes exercisable as to 25% of the shares on each anniversary of the grant date. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. The restricted stock units vest in four equal annual installments beginning November 16, 2013. JANIS SALIN for STEVEN M. BURDICK 2012-11-17