| | — | WESTAT, INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | May 15, 1999 | May 15, 1999 | Jun 15, 2002 |
| | — | WESTAT, INC. | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | May 15, 1999 | May 15, 1999 | Jun 15, 2002 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Mar 15, 1999 | Mar 15, 1999 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Feb 15, 1999 | Feb 15, 1999 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Feb 15, 1999 | Feb 15, 1999 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Jan 15, 1999 | Jan 15, 1999 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Jan 15, 1999 | Jan 15, 1999 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Jan 15, 1999 | Jan 15, 1999 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Dec 15, 1998 | Dec 15, 1998 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Sep 15, 1998 | Sep 15, 1998 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Sep 15, 1998 | Sep 15, 1998 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Aug 15, 1998 | Aug 15, 1998 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Aug 15, 1998 | Aug 15, 1998 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Jul 15, 1998 | Jul 15, 1998 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Jul 15, 1998 | Jul 15, 1998 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Jun 15, 1998 | Jun 15, 1998 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | May 15, 1998 | May 15, 1998 | Sep 15, 1999 |
| | — | ABT GLOBAL LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Feb 15, 1998 | Feb 15, 1998 | Sep 15, 1999 |
| | — | Abt Global LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Mar 15, 1997 | Mar 15, 1997 | Sep 15, 1999 |
| | — | Abt Global LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Sep 15, 1996 | Sep 15, 1996 | Sep 15, 1999 |
| | — | Abt Global LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Aug 15, 1996 | Aug 15, 1996 | Sep 15, 1999 |
| | — | Abt Global LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Aug 15, 1996 | Aug 15, 1996 | Sep 15, 1999 |
| | — | Abt Global LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Jul 15, 1996 | Jul 15, 1996 | Sep 15, 1999 |
| | — | Abt Global LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Jul 15, 1996 | Jul 15, 1996 | Sep 15, 1999 |
| | — | Abt Global LLC | $0 | ENVIRONMENTAL PROTECTION AGENCY | — | — | — | AH90 | Jul 15, 1996 | Jul 15, 1996 | Sep 15, 1999 |