2025 ANNUAL CLAY BASIN WITHDRAWAL TEST

MountainWest Pipeline (MWP) has scheduled the annual Clay Basin Withdrawal test for gas days April 1- April 10, 2025. Listed below is the schedule for this year’s test (All references are to gas days):

March 13: MWP will issue Operational Flow Orders to all FSS customers indicating their required withdrawal volumes.

March 29 through March 31: Field limited to physical withdrawal only. No injection nominations will be accepted.

April 1: The reservoir will be conditioned at a constant withdrawal rate of 250 MMcf (258 Mdth) for 24 hours.

April 2: Reservoir test at a constant withdrawal rate of 275 MMcf (284 Mdth) for 24 hours.

April 3 through April 9: Field shut-in. Only in-place transfer nominations will be processed.

April 10: Field returns to normal at 8:00 AM.

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