Questar Pipeline Company

First Revised Volume No. 1

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

Fourth Revised Sheet No. 150 Fourth Revised Sheet No. 150 : Effective

Superseding: Third Revised Sheet No. 150

RATE SCHEDULE ISS

INTERRUPTIBLE STORAGE SERVICE

CLAY BASIN

1. AVAILABILITY

Service under this rate schedule is available on a

nondiscriminatory basis to any shipper for the purchase of

interruptible storage service from Questar when:

(a) Questar has determined that it has sufficient

available storage capacity to perform service requested by

shipper;

(b) Shipper and Questar have executed an

interruptible storage service agreement; and

(c) Shipper has arranged separately for any

transportation service required for utilization of the

storage service provided under this rate schedule.

2. APPLICABILITY AND CHARACTER OF SERVICE

This rate schedule shall apply to all interruptible

storage service rendered by Questar to shipper pursuant to

an executed interruptible storage service agreement.

The storage service rendered by Questar under this rate

schedule shall be interruptible as provided in 9 and 21

of the General Terms and Conditions of this part and shall

consist of:

(a) The injection of shipper's working gas as

provided in 10 of the General Terms and Conditions of this

part.

(b) The storage of shipper's working gas in amounts

up to shipper's annual working gas specified in the storage

service agreement.

(c) The withdrawal of shipper's working gas as

provided in 10 of the General Terms and Conditions of this

part.

3. RATES AND CHARGES

The rates and charges paid by shipper for interruptible

storage service under this rate schedule, except as provided

in 3(f) (Negotiated Rates) of this rate schedule, shall

include the applicable storage rate components set out on

the Statement of Rates as described below: