Mississippi River Transmission Corp.

Original Volume No. 1-A

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Effective Date: 02/01/1990, Docket: GT90- 12-000, Status: Effective

First Revised Sheet No. 20 First Revised Sheet No. 20 : Effective

Superseding: Original Sheet No. 20

RATE SCHEDULE ITS

INTERRUPTIBLE TRANSPORTATION SERVICE

1. AVAILABILITY

1.1 This rate schedule is available for transportation of

natural gas on an interruptible basis by Mississippi River Transmission

Corporation (hereinafter referred to as Transporter) for any party as

described below (hereinafter referred to as Shipper) under the

following conditions:

(a) Shipper makes a valid request as defined in Section 12

of the Transportation General Terms and Conditions and enters into

a contract with Transporter for transportation service under this

rate schedule in the form of the service agreement (Transportation

Service Agreement) contained in this Volume No. 1-A Tariff; and

(b) Transporter determines that sufficient capacity exists

on its system or parts thereof (including receipt and delivery

points) from time to time to perform the interruptible

transportation service requested.

1.2 Service under this rate schedule shall be made available on

a first-come, first-served basis to any party willing and able to pay

the maximum rates hereunder in accordance with the Transportation

General Terms and Conditions of this Volume No. 1-A Tariff.

1.3 For the purpose of determining the availability of service

in processing requests received in accordance with Section 12 of the

Transportation General Terms and Conditions, Transporter shall not be

required to grant any such request for transportation under the

following conditions:

(a) If, in Transporter's judgment, such transportation on

an interruptible basis could interfere with the integrity of the

system or with service to firm sales or firm transportation

customers;