Dept. of Trans.             PROGRESS              Serial No.    Contract No.
                                                  23-234-12-42  07-318204
                    PROGRESS PAYMENT VOUCHER      %complete:    %time:
                                                    84%           77%

Location:                                         Federal Project:
07-VEN-1-4.0/4.2                                  NONE

Progress payment No. 023                     Payment period ending: 08-20-23
FLATIRON-DRILL TECH A JOINT
VENTURE
12121 SCRIPPS SUMMIT DRIVE #4
SAN DIEGO CA 92131

Escrow No. 00000
                                           Total Estimate      This Estimate
 1. Contract Itms Without Mobil.            33,296,418.47       1,833,212.74
 2. a. Extra Work                            4,520,978.64          29,647.53
    b. Adustment Comp.                         272,658.58               0.00
 3. Materials on Hand                          384,478.67        -248,101.15
 4. Earned Subject to Retention             38,474,534.36       1,614,759.12
 5. Mobilization                             4,208,000.00               0.00
 6. Total Work Completed     42,298,055.69
 7. Deductions
 8. a. Contract Retentions
    b. Unsatisfactory Retentions
    c. Reduction after 95% Comp.
 9. Total pay to Contractor                 42,682,534.36       1,614,759.12
10. Reduction Amt to Escrow
11. Payment to Escrow                 0.00
12. Net Pymt. this Estimate                                     1,614,759.12