U S G Pipeline Company

ORIGINAL VOLUME NO. 1

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Effective Date: 04/01/2000, Docket: CP99-211-001, Status: Effective

Original Sheet No. 11 Original Sheet No. 11 : Effective

IT RATE SCHEDULE

INTERRUPTIBLE TRANSPORTATION SERVICE

1. AVAILABILITY

This Rate Schedule is available for the transportation of natural gas on an

interruptible basis by USG Pipeline Company (hereinafter called Transporter) to

any Shipper:

(a) that makes a valid request for interruptible service and executes an

Interruptible Transportation Agreement ("IT Agreement"); and

(b) to the extent that interruptible capacity is available on

Transporter's system from time to time for the receipt of gas by

Transporter and the redelivery by Transporter for the account of

Shipper.

2. APPLICABILITY AND CHARACTER OF SERVICE

2.1 The service rendered shall be the transportation of natural gas up to

the Maximum Interruptible Quantity ("MIQ") set out in the IT

Agreement performed under Sub-parts B and G of Part 284 of the

Commissions Regulations subject to the availability of capacity

sufficient to provide the service without detriment or disadvantage

to Transporter's firm transportation customers.

2.2 Service shall be on an interruptible basis. Interruption of service

includes decreasing, suspending, or discontinuing either the receipt

or delivery of gas. Interruption and availability of interruptible

capacity shall be in accord with Section 9 of the General Terms and

Conditions.

2.3 Transporter shall not be required to install, operate or maintain any

additional facilities in order to provide transportation service

under this Rate Schedule.