2026 ANNUAL CLAY BASIN WITHDRAWAL TEST UPDATE

MountainWest Pipeline (MWP) has revised the scheduled dates for the annual Clay Basin Withdrawal test to gas days March 30- April 8, 2026. Listed below is the schedule for this year’s test (All references are for gas days):

March 5: MWP will issue Operational Flow Orders to all FSS customers indicating their required withdrawal volumes.

March 27 through March 29: Field limited to physical withdrawal only. No injection nominations will be accepted.

March 30: The reservoir will be conditioned at a constant withdrawal rate of 325,000 Mcf (341,250 Dth) for 24 hours.

March 31: Reservoir test at a constant withdrawal rate of 350,000 Mcf (367,500 Dth) for 24 hours.

April 1 through April 7: Field shut-in. Only in-place transfer nominations will be processed.

April 8: Field returns to normal at 8:00 AM.

If you have any questions, please contact your MWP Marketing or Contract Services Representative or Scheduling on the Customer Service Hotline at 801-584-6034.