Questar Southern Trails Pipeline Company

Original Volume No. 1

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Effective Date: 01/23/2006, Docket: RP06-154-000, Status: Effective

Second Revised Sheet No. 21 Second Revised Sheet No. 21 : Effective

Superseding: First Revised Sheet No. 21

RATE SCHEDULE IT

INTERRUPTIBLE TRANSPORTATION SERVICE

in the negotiated rate provision of this rate schedule in § 3.4, shall be as

set forth in the currently effective Statement of Rates, as adjusted from time

to time. The charges shall include the following:

(a) Usage Charge. Shipper shall pay the appropriate usage

charge for all gas delivered by Southern Trails for transportation. The usage

charge shall be set forth in the transportation service agreement or any

amendment, and shall be no more than the maximum nor less than the minimum

rate specified in the Statement of Rates.

(b) Unauthorized Overrun Charge. Shipper shall pay the

unauthorized overrun charge set forth on Southern Trails' Statement of Rates

for all unauthorized quantities of gas transported by Southern Trails.

(c) Additional Facility Charge. Any charge for additional

facilities shall be paid by Shipper according to § 24 of the General Terms and

Conditions.

(d) Cashout. Shipper will be subject to the balancing and

cashout provisions according to § 15 of the General Terms and Conditions.

(e) Fuel Reimbursement. A fuel reimbursement charge will be

assessed according to § 30 of the General Terms and Conditions.

(f) Annual Charge Adjustment. The Annual Charge Adjustment

listed on the Statement of Rates shall apply to all quantities of gas

transported for Shipper under this rate schedule.

(g) Other Charges. Southern Trails shall charge Shipper for

any other FERC-approved charges that may apply to service under this rate

schedule.