Transcontinental Gas Pipe Line Company, LLC

Fourth Revised Volume No. 1

Effective Date: 05/01/2010, Docket: RP10-554-000, Status: Effective

Fifth Revised Sheet No. 81 Fifth Revised Sheet No. 81

Superseding: Fourth Revised Sheet No. 81

FIRM AND INTERRUPTIBLE TRANSPORTATION FUEL REQUIREMENTS

Fuel Retention Percentages (for Receipts other than Zone 4A or Zone 4B)

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Receipt Delivery

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Zone 4A & 4B

Zone 1 Zone 2 Zone 3 Zone 4 1/ Zone 5 Zone 6

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

Zone 1 0.30% 0.72% 1.17% 3.15% 3.69% 4.76% 5.65%

Zone 2 0.42% 0.87% 2.85% 3.39% 4.46% 5.35%

Zone 3 0.45% 2.43% 2.97% 4.04% 4.93%

Zone 4 1.98% 2.52% 3.59% 4.48%

Zone 5 1.61% 2.50%

Zone 6 0.89%

Fuel Retention Percentages (for Receipts in Zone 4A or Zone 4B)

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

Receipt Delivery

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Forward Backhaul

Zone 1 Zone 2 Zone 3 Haul In Haul In

2/ 2/ 2/ Zone 4 Zone 4 Zone 4A Zone 4B Zone 5 Zone 6

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

Zone 4A 0.54% 0.54% 0.54% 2.52% 0.54% 0.54% 0.54% 4.13% 5.02%

Zone 4B 0.88% 0.88% 0.88% 2.86% 0.88% 0.88% 0.34% 4.47% 5.36%

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The above fuel retention percentages apply only to the forward-haul portion, if any, of a

transportation. For transactions in which the receipt zone is downstream of the delivery zone,

the within zone fuel retention percentage(s) will apply for each zone(s) in which there is a

forward haul movement of gas. No fuel will be retained on transportation which does not include a

forward-haul movement of gas.

Notes:

1/ Transportation deliveries to Zone 4B do not entail the forward-haul movement of gas in

Zone 4B.

2/ The stated fuel retention percentages for deliveries to Zones 1, 2 or 3 assume no

forward-haul movement of gas in Zones 1, 2 or 3.