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  1. Questar’s Gas Storage Facilities in the West Brent Kitchen Supervisor, Pipeline Marketing

  2. Questar Pipeline Storage Facilities Peaking Storage (3) Salt Cavern Storage (Proposed) WYOMING Kanda Hub Proposed Clay Basin UTAH COLORADO

  3. Name Clay Basin Leroy Coalville Chalk Creek Type Depleted Gas Aquifer Aquifer Aquifer Formation Dakota Thaynes Longwall Kelvin Horsepower 32,500 3830 1600 550 Max. W/D 765MMCF 75MMCFD 65MMCFD 35MMCFD Working 51.25BCF .836BCF .692BCF .256BCF Cushion 66.21BCF 5.62BCF 2.13BCF 1.27BCF Total 117.5BCF 6.41BCF 2.74BCF 1.18BCF Pressure 2600 psig 1540psig 1144psig 1125psig Present Storage Facilities

  4. Clay Basin Storage Facility

  5. WYOMING Rock Springs 50 Miles COLORADO Salt Lake City 140 Miles UTAH Clay Basin is connected to both Questar and Northwest Pipeline.

  6. Clay Basin Storage Facilities • Five 2,600 HP reciprocating compressors • Three 6,500 HP turbine compressors • One Park and Loan compressor • 89,000 feet of 6 and 10-inch field lines • 29 field dehydration units • 44 injection and withdrawal wells

  7. The Clay Basin Field is a anticlinal dome about four miles long and two miles wide that underlies some 4,680 acres. Clay Basin’s Geology

  8. Present Customer Mix

  9. Present Customer Mix

  10. Clay Basin Storage

  11. Clay Basin January Averages

  12. Clay Basin Service Opportunities • Firm Storage Service • Capacity Release • Interruptible Storage Service • Release of Injection/Withdrawal rights • In-place Transfers • Park and Loan (PAL1)

  13. Questar Hub Services • Questar offers two types of Park and Loan service levels, PAL1 and PAL2. • Service Priority; FSS, PAL1, ISS, PAL2. • Questar’s Representative for PAL services is Marty Anderson 801 324-2017

  14. Questar’s Future Storage Projects • Questar Pipeline is currently exploring two storage projects to meet the needs of its customers • Southwest Wyoming Salt Cavern project near Evanston, Wyoming (salt cavern) • Kanda Hub Storage Project near Rock Springs, Wyoming (depleted gas field)

  15. Questar Project Status • Work is continuing on both storage projects, however the primary focus is on the depleted gas storage project with the potential to tie to multiple large diameter pipelines • Assuming that gas prices decline and stabilize in the near future, an open season is anticipated in 2004 for the Kanda Hub Project

  16. Why Salt? • Caverns can be emptied and refilled quickly • High injection and withdrawal rates make them well-suited to meet peaking requirements multiple times during the same demand period • Salt is an excellent sealant • Impervious to natural gas and seals itself (“creep”) • The salt is strategically located

  17. Project History • Drilled and analyzed core hole test well in Pruess Formation • 3,000 ft deep, 2,000 ft thick • Conducted initial project feasibility studies • Consultant: Sofregaz US Inc. • Acquired necessary leases and rights • Leases for caverns and disposal wells • Options for water rights from City of Evanston

  18. Project Feasibility • Salt • Water • Brine disposal • Location • Proposed initial pipelines ties are Kern River and Questar Pipeline • As market demand requires we will tie to the other major pipelines in the area

  19. Capacity and Deliverability • Potential for five caverns • Sequential cavern development • Storage capacity of 2.5 Bcf working gas and 1.1 Bcf cushion gas per cavern • Deliverability of 250 MMcf/day per cavern • Injection of 125 MMcf/day per cavern

  20. Current Status • Disposal test well to Nugget Formation • Core and log Twin Creek and Nugget Formations • Open-hole injectivity test of Nugget • Disposal options: Reinjection, settling ponds and/or combination of these • Engineering design • Preliminary cavern design and brine disposal • Pipeline routes and operating facilities (Questar)

  21. Rock Springs Storage Project • Preliminary engineering underway to determine project capacity, cost and timing • Projected size ranging from 15 Bcf to 20 Bcf working gas • Anticipated interconnects with Questar Pipeline, Overthrust, CIG, WIC and Overland Trail • Projected in service 2007 - 08

  22. Summary • Questar Pipeline is focused on providing transportation and storage service that will improve market access for Rocky Mountain gas supply. Implementing solutions to meet customer needs continues to be our goal in a challenging environment. We look forward to working with our energy partners to find those solutions.