| Modification # | Description | Disclosure # | Award Date | Start Date | End Date | Department | Amount | 
|---|---|---|---|---|---|---|---|
| 
 
	
		266351
	
	
 
			 | PROFESSIONAL TASK ORDER SERVICES: GROUP B) AIRPORT ENGINEERING (NON-FEDERAL) | 10/11/2012 | 10/03/2012 | 10/02/2017 | CHICAGO DEPARTMENT OF AVIATION | DUR | |
| PROFESSIONAL TASK ORDER SERVICES: GROUP B) AIRPORT ENGINEERING (NON-FEDERAL) | 08/04/2017 | 10/03/2012 | 05/02/2019 | CHICAGO DEPARTMENT OF AVIATION | DUR | ||
| 
 
	
		266355
	
	
 
			 | PROFESSIONAL TASK ORDER SERVICES: GROUP B) AIRPORT ENGINEERING (NON-FEDERAL) | 05/01/2019 | 10/03/2012 | 05/31/2019 | CHICAGO DEPARTMENT OF AVIATION | DUR | |
| PROFESSIONAL TASK ORDER SERVICES: GROUP B) AIRPORT ENGINEERING (NON-FEDERAL) | 07/25/2019 | 10/03/2012 | 12/31/2021 | CHICAGO DEPARTMENT OF AVIATION | DUR | ||
| PROFESSIONAL TASK ORDER SERVICES: GROUP B) AIRPORT ENGINEERING (NON-FEDERAL) | 08/06/2021 | 10/03/2012 | 12/31/2023 | CHICAGO DEPARTMENT OF AVIATION | DUR |