1. Steps to a SuccessfulUnderground ProjectNavigating the Pitfalls by Understandingand Managing RisksMarch 6, 2012Chris Norquist, P.E.Burns & McDonnell

2. Agenda Overview Planning Throughout Project Life Cycle Project Siting Routing Design Procurement Construction Conclusions 3. Overview 4. Overview A lot of negative stigmas associated withunderground transmission: Cost Performance issues in past Fear of the unknown It is critical that a successful underground project: Identify instead of ignore potential risks Proactively manage them throughout the process 5. Project Siting 6. Project Siting The two-faced nature of undergroundtransmission: Go Underground!!! 7. Project Siting The two-faced nature of undergroundtransmission: But I dont want to pay for it! And not in front of my house! 8. Project Siting No Magic Bullet Ways to Make It As Palatable As Possible Do Your Homework Know your audience Anticipate the issues Early and Concise Communication Beat the misinformation to the punch Meet with stakeholders Public Involvement 9. UndergroundRouting 10. Project Routing Primary Objectives: First chance to Identify, Review, and Minimize Risks. Which route provides the best chance for success Potential Pitfalls: Physical Constraints Socio-economic Issues Permitting 11. Underground Routing Steps to Successful Routing: Investigate and Identify all Routing Constraints Investigate and Identify all Routing Opportunities Establish Routing Criteria and Priorities Quantify Routing Options Based on Criteria andPriority Weighting Select Primary and Alternative Routes 12. UndergroundDesign 13. Underground Design Primary Design Objectives: Detailed investigation of unknowns identified inrouting stage Provide clear and complete construction packagesbased on results of investigations 14. Underground Design Field Investigations: Subsurface Utility Engineering (SUE) Geotechnical Investigation Trenchless Crossing Design/Feasibility Phase 1/Phase 2 Environmental Reviews 15. Underground Design Subsurface Utility Engineering (SUE) Critical in urban areas to minimize surprises duringconstruction FHWA SUE Quality Level Designations: Quality Level D Utility Record Research Quality Level C Surveying Visible Utility Features 16. Underground Design Subsurface Utility Engineering (cont.) Quality Level B Locating Subsurface Utilities utilizing geophysical methods For example, electromagnetic induction or ground penetrating radar Quality Level A Potholing with vacuum excavation or other Physically identifying the depth, type, size, condition, material offacility 17. Underground Design Geotechnical Engineering Thermal Resistivity Testing Major impact to cable design Cant pinpoint with traditional geotechnical data Qualifications of geotechnical testing firm IEEE 442 Guide for Soil Thermal Resistivity Measurements Rock Probing Important to identify early to avoid costly change orders and schedule delays for getting necessary equipment on site. Other 18. Underground Design Trenchless Crossings Select Proper Drilling Technology: Horizontal Directional Drill (HDD) Jack & Bore Microtunneling 19. Underground Design Trenchless Crossings Site Review Soil Conducive? Adequate Real Estate for Required Set Back and Equipment? Identify Permitting/Environmental Issues Contingency Plan if Construction Issues Arise 20. Underground Design Environmental Reviews Phase 1 Historical review of known contamination in area Phase 2 Field testing to verify presence and level of contamination Develop Soils Management Plan Prepare for expected and unexpected disposal Identify removal procedures and disposal sites 21. Procurement 22. Procurement Civil Material Specifications Qualified Suppliers Understand sensitivities of high voltage system For example: Mix designs for concrete or thermal backfill Thermal tests up front, no air entrainment Precast vendors Understand the amount of tension required for pulling eyes Grounding provisions Knockouts for conduits w/o rebar loops 23. Procurement Electrical Material Specifications Qualified Suppliers Warranties Duration 5 years? Contracting to avoid finger pointing Support During Supply/Construction/Warranty Local Representatives? Mobilize quickly if issues arise. Factory QA/QC Program Accessories Qualified with cable system 24. Construction 25. Construction SequencingStep A. Splice Vault Installation Step D. Cable Pulling* Step C. Construction RestorationConstruction Period (months) A BCD EConstruction Start start Step B. Duct Bank InstallationStep E. Cable Splicing* 26. Construction Civil Qualified Contractor Understands specification requirements Manage! Up front unit rates, as possible, for unknowns Increased Depth Rock Dewatering Contaminated Soils 27. Construction Civil Testing Manage QC Program Material Testing Conduit Installation/Jointing Duct Cleaning & Proofing 28. Construction Electrical Qualified Contractor Workmanship in accessory installation is paramount Testing & Commissioning Jacket Integrity Test (JIT): 10-kV DC applied to cable sheath for 60 seconds. AC HiPot Test: 24 hours at system voltage 1 hour at 1.3 to 1.7 times Uo 29. Conclusions 30. Conclusions How to successfully navigate the unknowns: Develop Plan Early Project Execution Plan Identify Risks & Unknowns Early Routing Field Investigations Contracting Manage throughout