| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541330Engineering Services | B510SPECIAL STUDIES/ANALYSIS- ENVIRONMENTAL ASSESSMENTS | Jul 15, 2002 | Jul 15, 2002 | Aug 15, 2002 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541330Engineering Services | B510SPECIAL STUDIES/ANALYSIS- ENVIRONMENTAL ASSESSMENTS | Jul 15, 2002 | Jul 15, 2002 | Aug 15, 2002 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541330Engineering Services | D302 | Feb 15, 2002 | Feb 15, 2002 | Aug 15, 2002 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541330Engineering Services | D302 | Aug 15, 2001 | Aug 15, 2001 | Aug 15, 2002 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541330Engineering Services | D302 | Apr 15, 2001 | Apr 15, 2001 | Aug 15, 2002 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541330Engineering Services | AH94 | Mar 15, 2001 | Mar 15, 2001 | Aug 15, 2001 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541330Engineering Services | AH94 | Feb 15, 2001 | Feb 15, 2001 | Aug 15, 2001 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541330Engineering Services | D302 | Jul 15, 2000 | Jul 15, 2000 | Aug 15, 2001 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | D302 | Mar 15, 2000 | Mar 15, 2000 | Aug 15, 2000 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | D302 | Feb 15, 2000 | Feb 15, 2000 | Aug 15, 2000 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | D302 | Feb 15, 2000 | Feb 15, 2000 | Aug 15, 2000 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | D302 | Oct 15, 1999 | Oct 15, 1999 | Aug 15, 2000 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | D302 | Oct 15, 1999 | Oct 15, 1999 | Aug 15, 2000 |
| | — | TETRA TECH INC. | $0 | DEPT OF THE ARMY | — | — | — | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Jun 4, 1998 | Jun 4, 1998 | — |
| | — | TETRA TECH INC. | $0 | DEPT OF THE ARMY | — | — | — | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Jan 26, 1998 | Jan 26, 1998 | — |
| | — | TETRA TECH INC. | $0 | DEPT OF THE ARMY | — | — | — | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Nov 5, 1997 | Nov 5, 1997 | — |
| | — | TETRA TECH INC. | $0 | DEPT OF THE ARMY | — | — | — | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Nov 5, 1997 | Nov 5, 1997 | — |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541330Engineering Services | D302 | Aug 15, 1997 | Aug 15, 1997 | Aug 15, 2002 |
| | — | TETRA TECH INC. | $0 | DEPT OF THE ARMY | — | — | — | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Jul 22, 1997 | Jul 22, 1997 | — |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | R529 | May 15, 1997 | May 15, 1997 | Sep 15, 1998 |
| | — | TETRA TECH INC. | $0 | DEPT OF THE ARMY | — | — | — | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | May 15, 1997 | May 15, 1997 | — |
| | — | TETRA TECH INC. | $0 | DEPT OF THE ARMY | — | — | — | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | May 14, 1997 | May 14, 1997 | — |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | 541611Administrative Management and General Management Consulting Services | AH31NATURAL RESOURCES AND ENVIRONMENT R&D SERVICES; RECREATIONAL RESOURCES; BASIC RESEARCH | Apr 15, 1997 | Apr 15, 1997 | Mar 15, 2000 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | R529 | Mar 15, 1997 | Mar 15, 1997 | Sep 15, 1998 |
| | — | TETRA TECH INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | R529 | Feb 15, 1997 | Feb 15, 1997 | Sep 15, 1997 |