Questar Southern Trails Pipeline Company

Original Volume No. 1

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Effective Date: 02/28/2010, Docket: RP10-332-000, Status: Effective

Twelfth Revised Sheet No. 4 Twelfth Revised Sheet No. 4

Superseding: Eleventh Revised Sheet No. 4

STATEMENT OF RATES

Rate Schedule/ Currently

Type of Charge Base Tariff Rate ACA Surcharge 2/ Effective Rates

$/Dth $/Dth $/Dth

Rate Schedule FT

Reservation Charge

Maximum 3/ 11.22231 - 11.22231

Minimum 0.00000 - 0.00000

Credit 4/ 2.28875 - 2.28875

Usage Charge

Maximum 0.01041 0.00190 0.01231

Minimum 0.01041 0.00190 0.01231

Authorized Overrun Charge

Maximum 0.37937 0.00190 0.38127

Minimum 0.01041 0.00190 0.01231

Unauthorized Overrun Charge 10.00000 - 10.00000

Rate Schedule IT

Usage Charge

Maximum 0.37937 0.00190 0.38127

Minimum 0.01041 0.00190 0.01231

Unauthorized Overrun Charge 10.0000 - 10.00000

Fuel Reimbursement: Pursuant to § 30 of the General Terms and Conditions of this tariff.

Optional Volumetric Releases 1/

Firm transportation - FT

Maximum 3/ 0.36895 - 0.36895

Minimum 0.00000 - 0.00000

Pipeline Usage Charges Applicable to Volumetric Releases

Maximum 0.01041 0.00190 0.01231

Minimum 0.01041 0.00190 0.01231

Other Charges

Marketing Fee: As negotiated between Southern Trails and Shipper when Southern Trails actively

markets Shipper's released capacity.

[NOTE: Footnotes are on Sheet No. 5]