Dept. of Trans.       SUPPLEMENTAL   Serial No.  Contract No.                           
                                          08-101-10-43  08-334844                       
                PROGRESS PAYMENT VOUCHER  %complete:   %time:                           
Location:                                  91%          86%                             
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. 67            Payment period ending: 03-20-08                      
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.     156,371,731.75      386,944.25                      
2.a. Extra Work                      21,364,671.25      685,422.38                      
  b. Adjustment Comp.                39,123,304.81      -13,290.40                      
3. Materials on Hand                    395,094.36            0.00                      
4. Earned Subject to Retention      217,254,802.17    1,059,076.23                      
5. Mobilization                      18,343,064.95            0.00                      
6. Total Work Completed  235,202,772.76                                                 
7. Deductions                          -364,149.69            0.00                      
8. a.Contract Retentions            -10,862,740.11      -52,953.81                      
   b. Unsatisfactory Prog.                                                              
   c. Reduction after 95% Comp.                                                         
9. Total pay to Contractor          224,370,977.32    1,006,122.42                      
10. Reduction Amt to Escrow                                                             
11. Payment to Escrow     9,942,760.00                                                  
12. Net Pymt. this Estimate                           1,006,122.42