Transcontinental Gas Pipe Line Company, LLC

Fourth Revised Volume No. 1

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Effective Date: 04/01/2010, Docket: RP10-379-000, Status: Effective

Third Revised Sheet No. 88 Third Revised Sheet No. 88

Superseding: Second Revised Sheet No. 88

TRADING FEES AND TRADING FUEL RETENTION PERCENTAGES

PURSUANT TO SECTION 25.4 AND 25.7 OF THE

GENERAL TERMS AND CONDITIONS

OIA 2 Firm Trading Fee ($ per dt)

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Positive

Imbalance Negative Imbalance

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Zone 4 Zone 5 Zone 6

Zone 4 - 0.01506 0.02634

Zone 5 - - 0.01128

Zone 6 - - -

OIA 2 Interruptible Trading Fee ($ per dt)

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Positive

Imbalance Negative Imbalance

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

Zone 4 Zone 5 Zone 6

Zone 4 - 0.17364 0.29780

Zone 5 - - 0.12416

Zone 6 - - -

OIA 2 Trading Fuel Retention Percentages

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Positive

Imbalance Negative Imbalance

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

Zone 4 Zone 5 Zone 6

Zone 4 - 1.61% 2.50%

Zone 5 - - 0.89%

Zone 6 - - -