Questar Overthrust Pipeline Company

Second Revised Volume No. 1-A

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Effective Date: 04/25/2007, Docket: RP07-360-000, Status: Effective

Original Sheet No. 20 Original Sheet No. 20 : Effective

RATE SCHEDULE IT

INTERRUPTIBLE TRANSPORTATION SERVICE

1. AVAILABILITY

This rate schedule is available for interruptible transportation service

on behalf of any Shipper for service from any receipt point to any delivery

point on the system according to 18 C.F.R. Part 284, Subparts B & G provided:

(a) Overthrust is able to provide such service consistent with

its other obligations under Volume No. 1-A of its FERC Gas Tariff; and

(b) Shipper and Overthrust have executed a transportation

service agreement for service under this rate schedule.

2. APPLICABILITY AND CHARACTER OF SERVICE

The transportation service provided under this rate schedule:

(a) Shall be interruptible service performed pursuant to 18

C.F.R. Part 284, Subparts B and G;

(b) Shall apply to all gas transported by Overthrust for Shipper

under this rate schedule up to the daily quantity (DQ) as defined in § 1.10

of the General Terms and Conditions and specified in the transportation

service agreement;

(c) Shall be subject to interruption as provided in § 11 of the

General Terms and Conditions; and

(d) Shall be provided according to the availability determined

by § 11 of the General Terms and Conditions.

3. RATE PROVISIONS

3.1 Specified Charges. All charges for transportation service under

this rate schedule, except as provided for in § 3.4 (Negotiated Rates) of

this rate schedule, shall be as set forth in the currently effective

Statement of Rates, as adjusted from time to time. The charges shall include

the following: