Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

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Effective Date: 04/15/2010, Docket: RP10-606-000, Status: Effective

Tenth Revised Sheet No. 27 Tenth Revised Sheet No. 27

Superseding: Ninth Revised Sheet No. 27

STATEMENT OF EFFECTIVE RATES AND CHARGES

FOR TRANSPORTATION OF NATURAL GAS

(Continued)

NEGOTIATED RATE AGREEMENTS UNDER RATE SCHEDULE ITS-1, PS-1, AND AIS-1

Explanatory Footnotes for Negotiated Rates under Rate Schedule ITS-1, PS-1,

and AIS-1

5/ This agreement is for service under GTN's Rate Schedule PS-1. The fee

charged for this service under this agreement shall be determined as follows:

Maximum Allowable Total Quantity to be Parked: 250,000 Dth

Maximum Allowable Daily Quantity to be Parked: 20,000 Dth per day (or as

otherwise agreed upon by GTN

and Sempra)

Allowable Period to Park Quantities: April 15 - April 30, 2010

Allowable Period to Withdraw Parked Quantities: January 1 - January 31, 2011

Total Charge US$ (assessed May 2010): US$302,500.00

Sempra Energy Trading Corp. ("Sempra") shall use good faith efforts to park

gas on a ratable basis, up to the Maximum Allowable Daily Quantity to be

Parked, or as otherwise mutually agreed and further subject to GTN's ability

to park such quantities at the receipt point(s) specified in Sempra's Parking

Service Agreement. In addition, Sempra shall use good faith efforts to

withdraw all gas parked on a ratable basis, plus or minus 20%, or as otherwise

mutually agreed between GTN and Sempra, and further subject to GTN's ability

to redeliver such quantities at the same point(s) the gas was parked.

Any quantities Sempra parks on GTN's system in excess of the contracted

quantity between April 15, 2010, through April 30, 2010 (the "Parking

Period"), and any quantities parked in periods other than the Parking Period,

shall be subject to GTN's maximum tariff rate or other such generally

available system-wide discounted rate under Rate Schedule PS-1.

GTN shall reimburse Sempra $0.20/Dth, up to the contracted quantity for any

difference between the actual parked quantity during the Parking Period, and

the contracted quantity, applicable to any nominated and otherwise confirmable

quantities GTN was unable to park on its system during the Parking Period,

which may be occasioned by restricted capacity, adverse inventory positions or

GTN scheduling errors. Sempra is obligated to make nominations on all

available nomination cycles during the day to be eligible for reimbursement.

Sempra shall have the right to request on subsequent days the makeup of

quantities GTN was unable to park.

GTN shall reimburse Sempra $0.20/Dth, up to the quantity actually parked, for

any quantities not withdrawn from GTN's system between January 1, 2011 and

January 31, 2011 (the "Withdrawal Period") due to GTN's inability to

accommodate a nominated and otherwise confirmable withdrawal for that

quantity during the Withdrawal Period, which may be occasioned by restricted

capacity, adverse inventory positions, or GTN scheduling errors. Sempra is

obligated to make nominations on all available nomination cycles during the

day to be eligible for reimbursement. Sempra shall have the right to request

on subsequent days the makeup of quantities GTN was unable to withdraw.

6/ Reserved