Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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Effective Date: 04/19/2005, Docket: RP00-107-007, Status: Effective

Forty-Second Revised Sheet No. 21 Forty-Second Revised Sheet No. 21 : Effective

Superseding: 2nd Sub Forty-First Revised Sheet No. 21

NOTICE OF CURRENTLY EFFECTIVE RATES

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(ALL RATES ARE STATED IN CENTS PER DEKATHERM OR MCF AS INDICATED)

TOP GAS SUPPLY BASE TARIFF

BASE TARIFF ACA THROUGHPUT REALIGNMENT RATE PLUS

RATE SCHEDULE UNIT RATE SURCHARGE SURCHARGE SURCHARGE SURCHARGES

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RATE SCHEDULE PAL-1

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COMMODITY CHARGE

MAXIMUM RATE PER DKT 30.884 N.A. N.A. N.A. 30.884

MINIMUM RATE PER DKT 3.120 N.A. N.A. N.A. 3.120