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Maintenance Construction Schedule - MountainWest Pipeline

2026 Schedule

Period	Category	Preliminary Dates	Duration	Location	Project	Possible Customer Impact	Current Capacity (Dth/d)	Restricted Capacity (Dth/d)	Anticipated Firm Cut Quantity	Anticipated Total Nomination Cut %
August	Anomaly Digs	Aug 17 - 30	15 Days	ML 1, ML13, and ML15 from Nightingale to Eakin	Anomaly Digs	Taps switching lines. No impacts anticipated. No flow reduction or pressure restrictions.	N/A	N/A	0 Dth/d	0%
August	Pig	August 4 & 6	2 Days	ML 1 Nightingale to Eakin	Smart Tool	The Nightingale ML22 Segment capacity will be reduced from 206,650 Dth/d to 55,000 Dth/d.	The Nightingale ML22 Segment capacity is 206,650 Dth/d	The Nightingale ML22 Segment capacity will be reduced from 206,650 Dth/d to 55,000 Dth/d.	54 %	65,000 Dth/d
August	System Integrity	August 18-19	2 Days	Skull Creek Dew Point Plant MS	Meter Replacement	Shut-in	MAP 967: 48,850 Dth/d MAP 167: 44,000 Dth/d	0 flow for MAPS 967 & 167	ALL	100%
August	Anomaly Digs	August 31-Sept 8	9 Days	ML 1 Eakin to Coleville	Anomaly Digs	None	N/A	N/A	0 Dth/d	0%
August	Compressor Maintenance	August 25-28	4 Days	Blind Canyon Compressor Station	Station ESD Testing	All Compression Offline	Varies, See latest EBB	TBD	TBD	TBD
September	Anomaly Digs	Sept 8-18	11 Days	ML22 and ML23 Skull Creek Compressor	Anomaly Digs	Capacity reduction on ML22 Nightengale segment, reduced pressures.	Varies, See latest EBB	TBD	TBD	TBD
October	Reservoir Testing	October 4 - 17	13 Days	Clay Basin	Annual Injection Test	No physical withdraw allowed starting GD Oct 4 through GD Oct 6. GD Oct 6, constant 250 MMcf/day INJ rate. GD oct 7, constant 275 MMcf/day INJ rate. GD October 8 through GD October 15, reservoir shut-in Resume normal operations GD October 16.	Varies, See latest EBB	TBD	ALL	100%

Note: This schedule is subject to change. It is recommended the Shippers monitor MountainWest Pipeline's critical notices about schedule revisions.