Williston Basin Interstate Pipeline Co.

Original Volume No. 1-B (Transportation)

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Effective Date: 10/01/1993, Docket: RP92-236-018, Status: Effective

4th Sub Fortieth Revised Sheet No. 10 Williston Basin Interstate Pipeline Co.: Original Volume No. 1-B (Transportation)

4th Sub Fortieth Revised Sheet No. 10 : Effective

Superseding: 5th Sub 38th Revised Sheet No. 10

NOTICE OF CURRENTLY EFFECTIVE RATES

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

GAS COST ADJUSTMENT CURRENT RATE AFTER RATE AFTER

RATE SCHEDULE FT-1 BASE TARIFF ---------------------- SURCHARGE CUMULATIVE CURRENT GRI ACA THROUGHPUT CURRENT ADJ.

RESERVATION CHARGE UNIT RATE CURRENT CUMULATIVE ADJUSTMENT ADJUSTMENT ADJUSTMENT SURCHARGE A/SURCHARGE SURCHARGE D/PLUS SURCHARGES

------------------ ------------------- --------- ---------- ---------- ---------- --------- ------------ ----------- ----------- --------- --------------

MAXIMUM DAILY DELIVERY QUANTITY (MDDQ)

MAXIMUM RATE PER MCF PER MO. 276.495 N.A. N.A. N.A. N.A. 276.495 8.218 N.A. N.A. 284.713

MINIMUM RATE PER MCF PER MO. 0.000 N.A. N.A. N.A. N.A. 0.000 0.000 N.A. N.A. 0.000

ANNUAL DELIVERY QUANTITY (ADQ)

MAXIMUM RATE PER MCF PER MO. 1.445 N.A. N.A. N.A. N.A. 1.445 N.A. N.A. N.A. 1.445

MINIMUM RATE PER MCF PER MO. 0.000 N.A. N.A. N.A. N.A. 0.000 N.A. N.A. N.A. 0.000

COMMODITY CHARGE

----------------

MAXIMUM RATE PER DKT 11.200 N.A. N.A. N.A. N.A. 11.200 1.470 0.247 16.977 29.894

MINIMUM RATE PER DKT 2.191 N.A. N.A. N.A. N.A. 2.191 0.000 0.247 0.000 2.438

FUEL CHG. REIMBURSE. B/ RATE PER DKT 7.092 N.A. N.A. N.A. N.A. 7.092 N.A. N.A. N.A. 7.092

GATHERING CHARGE

----------------

MAXIMUM RATE PER DKT 26.641 N.A. N.A. N.A. N.A. 26.641 N.A. N.A. N.A. 26.641

MINIMUM RATE PER DKT 0.773 N.A. N.A. N.A. N.A. 0.773 N.A. N.A. N.A. 0.773

FUEL CHG. REIMBURSE. C/ RATE PER DKT 0.254 N.A. N.A. N.A. N.A. 0.254 N.A. N.A. N.A. 0.254

SCHEDULED OVERRUN CHARGE

------------------------

MAXIMUM RATE PER DKT 36.197 N.A. N.A. N.A. N.A. 36.197 1.470 0.247 16.977 54.891

MINIMUM RATE PER DKT 2.191 N.A. N.A. N.A. N.A. 2.191 0.000 0.247 0.000 2.438

FUEL CHG. REIMBURSE. B/ RATE PER DKT 7.092 N.A. N.A. N.A. N.A. 7.092 N.A. N.A. N.A. 7.092

BALANCING CHARGE RATE PER DKT 16.303 N.A. N.A. N.A. N.A. 16.303 N.A. N.A. N.A. 16.303

------------------------

A/ GRI SURCHARGE IS APPLICABLE TO TRANSPORTATION TO DISTRIBUTOR CUSTOMERS AND DELIVERIES TO NON-MEMBER PIPELINES. IF A TRANSPORTATION TRANSACTION IS

DISCOUNTED, THE GRI SURCHARGE(S) WILL BE DEEMED TO BE THE FIRST COMPONENT OF THE TOTAL RATE TO BE DISCOUNTED.

B/ APPLICABLE TO BOTH MAXIMUM AND MINIMUM RATES. THE APPLICABLE FUEL CHARGE REIMBURSEMENT RATE IS 7.092 CENTS, CONSISTING OF 7.350 CENTS FOR THE CURRENT

CHARGE AND (.258) CENTS FOR THE SURCHARGE ADJUSTMENT. THESE CHARGES ARE MULTIPLIED BY THE APPLICABLE QUANTITIES OF TRANSPORTATION GAS DELIVERED BY TRANSPORTER.

C/ APPLICABLE TO BOTH MAXIMUM AND MINIMUM RATES. THE APPLICABLE FUEL CHARGE REIMBURSEMENT RATE IS .254 CENTS, CONSISTING OF .348 CENTS FOR THE CURRENT

CHARGE AND (.094) CENTS FOR THE SURCHARGE ADJUSTMENT. THESE CHARGES ARE MULTIPLIED BY THE APPLICABLE QUANTITIES OF GAS GATHERED BY TRANSPORTER.

D/ THE THROUGHPUT SURCHARGE CONSISTS OF 8.043 CENTS PER DKT FOR COSTS BEING RECOVERED PURSUANT TO DOCKET NO. RP90-137-000, PLUS .073 CENTS PER DKT FOR COSTS

BEING RECOVERED PURSUANT TO DOCKET NO. RP91-56-000, PLUS 8.861 CENTS PER DKT FOR COSTS BEING RECOVERED PURSUANT TO DOCKET NO. RP93-___-000, FILED

AUGUST 26, 1993.