Questar Pipeline Company

First Revised Volume No. 1

Effective Date: 03/23/2001, Docket: RP01-233-000, Status: Effective

Second Revised Sheet No. 161 Second Revised Sheet No. 161 : Effective

Superseding: First Revised Sheet No. 161

PART 3

GENERAL TERMS AND CONDITIONS

(Continued)

1. DEFINITIONS

In addition to those definitions listed below that

specifically relate to Clay Basin storage service provided

under Rate Schedules FSS and ISS, other definitions that may

apply to this service are stated in Part 1 of this tariff.

1.1 Annual working gas means the volume and

associated thermal quantity of natural gas, determined by a

Btu conversion factor of 1.065, stated in shipper's storage

service agreement that Questar is obligated to store for

shipper.

1.2 Average monthly working gas balance means the sum

of shipper's daily quantities of working gas held in storage

by Questar divided by the number of days in that particular

month.

1.3 Clay Basin delivery point means the interconnect

of any transmission facility and Questar's Clay Basin

facilities where shipper's gas is available for withdrawal

from storage.

1.4 Clay Basin receipt point means the interconnect of

any transmission facility and Questar's Clay Basin

facilities where shipper's gas is available for injection

into storage.

1.5 Cushion gas means the volume of gas required for

inventory in the Dakota formation to maintain a reservoir

pressure adequate to ensure delivery from the storage

reservoir of all firm shippers' minimum required

deliverabilities during a given withdrawal season.

1.6 Dakota formation means that certain geological

formation in the Clay Basin Storage field, Daggett County,

Utah, encountered at a depth of approximately 5,622 feet

below the surface and continuing to a depth of approximately

5,812 feet below the surface in the Clay Basin Unit No. 2

Well, located in Section 21, Township 3 North, Range 24

East, S.L.B. & M., Daggett County, Utah, which unit

agreement and participating area (revised) were approved by

the Acting Secretary of the Interior on December 27, 1939,

and designated I Sec. No. 323.

1.7 Injection capacity means the capability of

Questar's facilities in the Clay Basin Storage field to