<SEC-DOCUMENT>0000831641-21-000160-index.html : 20211209 <SEC-HEADER>0000831641-21-000160.hdr.sgml : 20211209 <ACCEPTANCE-DATETIME>20211209183925 ACCESSION NUMBER: 0000831641-21-000160 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20211207 FILED AS OF DATE: 20211209 DATE AS OF CHANGE: 20211209 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Volpi Kirsten M CENTRAL INDEX KEY: 0001582882 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 000-19655 FILM NUMBER: 211483172 MAIL ADDRESS: STREET 1: 3475 EAST FOOTHILL BOULEVARD CITY: PASADENA STATE: CA ZIP: 91107 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: TETRA TECH INC CENTRAL INDEX KEY: 0000831641 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-ENGINEERING SERVICES [8711] IRS NUMBER: 954148514 STATE OF INCORPORATION: DE FISCAL YEAR END: 1003 BUSINESS ADDRESS: STREET 1: 3475 EAST FOOTHILL BOULEVARD CITY: PASADENA STATE: CA ZIP: 91107 BUSINESS PHONE: 6263514664 MAIL ADDRESS: STREET 1: 3475 EAST FOOTHILL BOULEVARD CITY: PASADENA STATE: CA ZIP: 91107 </SEC-HEADER> <DOCUMENT> <TYPE>4 <SEQUENCE>1 <FILENAME>wf-form4_163909315533150.xml <DESCRIPTION>FORM 4 <TEXT> Document 1 - file: wf-form4_163909315533150.html
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