Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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Effective Date: 05/21/2010, Docket: RP10-621-000, Status: Effective

Eleventh Revised Sheet No. 17 Eleventh Revised Sheet No. 17

Superseding: Tenth Revised Sheet No. 17

NOTICE OF CURRENTLY EFFECTIVE RATES

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(ALL RATES ARE STATED IN CENTS PER DEKATHERM OR EQUIVALENT DEKATHERM 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 FTN-1

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RESERVATION CHARGE

MAXIMUM DAILY DELIVERY QUANTITY (MDDQ)

MAXIMUM RATE PER EQV. DKT PER MO. 47.491 N.A. N.A. N.A. 47.491

MINIMUM RATE PER EQV. DKT PER MO. 1.589 N.A. N.A. N.A. 1.589

VOLUMETRIC CAPACITY RELEASE CHARGE

MAXIMUM RATE PER DKT 1.561 N.A. N.A. N.A. 1.561

MINIMUM RATE PER DKT 0.052 N.A. N.A. N.A. 0.052