Questar Pipeline Company

First Revised Volume No. 1

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

Second Revised Sheet No. 111 Second Revised Sheet No. 111 : Effective

Superseding: First Revised Sheet No. 111

PART 2

GENERAL TERMS AND CONDITIONS

(Continued)

1. DEFINITIONS

In addition to those definitions listed below that

specifically relate to peaking storage service provided

under Rate Schedule PKS, 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 stated in shipper's peaking

storage service agreement that Questar is obligated to store

for shipper.

1.2 Aquifer storage reservoir means Questar's peaking

storage reservoirs at Leroy, Wyoming and Coalville and Chalk

Creek, Utah.

1.3 Cushion gas means the volume of recoverable and

non-recoverable gas provided by Questar in the storage

formation of each peaking storage reservoir to maintain a

reservoir pressure adequate to ensure that shipper's

recoverable working gas can be withdrawn from the reservoir

during each annual storage cycle.

1.4 Gross working gas means the total amount of

working gas injected into an aquifer storage reservoir over

the course of an annual storage cycle.

1.5 Injection period means (i) for Leroy and

Coalville, a period of time beginning on or about September

1 of each calendar year and ending December 15 of that same

year, (ii) for Chalk Creek, a period of time beginning

November 1 of each calendar year and ending December 15 of

that same year.

1.6 Maximum daily withdrawal quantity means the

maximum daily quantity of gas that Questar is obligated to

withdraw from an aquifer storage reservoir for shipper as

stated in shipper's peaking storage service agreement.

1.7 Non-recoverable working gas means that volume of

working gas that cannot be withdrawn from an aquifer storage

reservoir using Questar's existing facilities and following

Questar's standard operating procedures.