Transcontinental Gas Pipe Line Company, LLC

Fourth Revised Volume No. 1

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Effective Date: 04/01/2010, Docket: RP10-395-000, Status: Effective

Third Revised Sheet No. 52 Third Revised Sheet No. 52

Superseding: Second Revised Sheet No. 52

FIRM TRANSPORTATION SERVICE RATES

UNDER RATE SCHEDULE FT APPLICABLE TO

MOMENTUM EXPANSION PROJECT

FIRM TRANSPORTATION SERVICE

Incremental Momentum Annual Firm Transportation

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

Maximum Minimum

Daily Daily

Rate Rate

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

($) ($)

Capacity rights commencing at Station 65:

Reservation Rate per dt - Zone 3-4:

Base Rate 0.26759 0.00000 1/

Electric Power Unit Rate 0.00136 0.00136

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Total Reservation Rate 0.26895 0.00136

Reservation Rate per dt - Zone 3-5:

Base Rate 0.39465 0.00000 1/

Electric Power Unit Rate 0.00213 0.00213

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Total Reservation Rate 0.39678 0.00213

Capacity rights commencing at Destin:

Reservation Rate per dt - Zone 4-4:

Base Rate 0.21485 0.00000 1/

Electric Power Unit Rate 0.00105 0.00105

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Total Reservation Rate 0.21590 0.00105

Reservation Rate per dt - Zone 4-5:

Base Rate 0.34191 0.00000 1/

Electric Power Unit Rate 0.00182 0.00182

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Total Reservation Rate 0.34373 0.00182

Notes:

1/ The minimum reservation rate applicable to capacity release transactions that are not

permanent releases shall not be less than zero.