Landfill Gas Migration Control

1. Landfill Gas Migration Control A Design-Build Success Story Dick Sprague HDR, Inc.

2. Purpose & Background • Design-Build Project Delivery • Emerging delivery system in public sector • Single source of responsibility • Faster, less contentious delivery • Not necessarily cheaper • Landfill • Historic landfill cell began in early 1950s • New, lined landfill cell began in late 1990s • Landfill gas migration discovered in 2001

3. Landfill Site

4. Landfill Gas Migration • Anaerobic decomposition • Predominantly methane and carbon dioxide • March 2001 monitoring • High concentrations of Lfg at property boundary • >1,000 feet beyond property boundary • May 2001 • Issued engineering RFP • Informed state agency & neighbors

5. Extent of Contamination

7. Design-Build Project • Too little time for traditional design-bid-build • 2-part contract • Several form contracts • AGC, AIA, EJCDC • DBIA is fairest to all parties • 2-Part form contract includes: • Terms & Conditions • Scope • Price & Schedule

8. Design-Build Project (cont.) • Part I - Concept Design & Proposal • 30% Design • Proposal for Part II • Firm, fixed price based on bids • Drilling subcontractor • Equipment supplier • Balance of construction contractor • Documents Belong to Owner • Negotiate with Part I contractor • Bid the work • Cancel the project

9. Design-Build Project (cont.) • Part II • Final Design • Construction, Start-up & Warantee • Firm schedule based on WES commitments • Contract (part II) signed on September 27 • Completion planned for December 14 • “Best Value” Selection

10. Design-Build Project (cont.)

11. Design-Build Project (cont.) • Performance • Drilling subcontractor failed to perform • Primarily his lower tier subs • Third lower tier sub required to complete project • Flare station operational December 14, accepted December 18 • 60 percent of wells operational on December 18; met commitment to state agency • Final completion January 18

12. Design-Build Project (cont.)

13. Design-Build Project (cont.)

14. Design-Build Project (cont.)

15. Design-Build Project (cont.)

16. Design-Build Project (cont.)

17. Design-Build Project (cont.) Lump Sum Price Change Orders Net Price

18. $929,367 ($ 25,129) _________ $904,238 Design-Build Project (cont.) Lump Sum Price Change Orders Net Price

19. Questions?

20. Design-Build Project (cont.)