Dept. of Trans.       PROGRESS   Serial No.  Contract No.                               
                                          08-171-13-10  08-334844                       
                PROGRESS PAYMENT VOUCHER  %complete:   %time:                           
Location:                                  92%          91%                             
08-RIV-215-R37.7/43.9                    Federal Project:                               
08-RIV-91-20.3/21.6                                     ACNH-215-1(219)                 
08-RIV-60-11.5/13.7                             I-215-1(219)                            
                             ACNH-X065(80)                                              
Progress payment No. 72            Payment period ending: 06-12-08                      
WASHINGTON GROUP INTERNATIONAL                                                          
INC OBAYASHI CORPORATION A                                                              
JOINT VENTURE                                                                           
P O BOX 600                                                                             
HIGHLAND CA 92346                                                                       
Escrow No.  02171                                                                       
                                    Total Estimate   This Estimate                      
1. Contract Itms Without Mobil.     164,442,615.22    3,045,011.77                      
2.a. Extra Work                      23,381,076.41      310,507.12                      
  b. Adjustment Comp.                41,576,222.47      -19,106.37                      
3. Materials on Hand                    166,102.44      -54,673.09                      
4. Earned Subject to Retention      229,566,016.54    3,281,739.43                      
5. Mobilization                      18,343,064.95            0.00                      
6. Total Work Completed  247,742,979.05                                                 
7. Deductions                          -349,149.69            0.00                      
8. a.Contract Retentions            -11,478,300.83     -164,086.97                      
   b. Unsatisfactory Prog.                                                              
   c. Reduction after 95% Comp.                                                         
9. Total pay to Contractor          236,081,630.97    3,117,652.46                      
10. Reduction Amt to Escrow                                                             
11. Payment to Escrow     9,942,760.00                                                  
12. Net Pymt. this Estimate                           3,117,652.46