Questar Southern Trails Pipeline Company

Original Volume No. 1

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Effective Date: 10/14/2008, Docket: CP99-163-004, Status: Effective

Second Revised Sheet No. 10 Second Revised Sheet No. 10

Superseding: First Revised Sheet No. 10

RATE SCHEDULE FT

FIRM TRANSPORTATION SERVICE

1. AVAILABILITY

This rate schedule is available for firm transportation service

according to 18 C.F.R. Part 284, Subparts B and G provided on behalf of any

Shipper for service from any receipt point to any delivery point.

(a) Southern Trails has available pipeline system capacity to provide

the firm service requested; and

(b) Shipper and Southern Trails have executed a transportation service

agreement for service under this rate schedule.

2. APPLICABILITY AND CHARACTER OF SERVICE

2.1 The transportation service provided under this rate schedule

shall:

(a) Be firm service performed pursuant to 18 C.F.R. Part 284,

Subparts B & G;

(b) Apply to all gas transported by Southern Trails for Shipper

under this rate schedule up to the reserved daily capacity (RDC) as defined in

§ 1.38 of the General Terms and Conditions and specified in the transportation

service agreement;

(c) Be subject to curtailment as provided in § 10 of the General

Terms and Conditions; and

(d) Be provided according to the availability determined by § 10

of the General Terms and Conditions.

2.2 Authorized Overrun Service. Upon request of Shipper, and if

capacity is available, Southern Trails will transport and deliver volumes of

gas in excess of Shipper's RDC. The service (i) shall be available only to

the extent it does not impair Southern Trails' ability to provide service

under