Discovery Gas Transmission LLC

Original Volume No. 1

Effective Date: 01/01/2008, Docket: RP08- 70-001, Status: Effective

Second Revised Sheet No. 143 Second Revised Sheet No. 143 : Effective

Superseding: Second Sub First Revised Sheet No. 143

If deliveries for a Shipper's account exceed receipts for

Shipper's account under a Service Agreement, the Underage Index

will apply. If receipts for a Shipper's account exceed deliveries

for a Shipper's account under a Service Agreement, the Overage

Index will apply. Cashouts will occur at the Delivery Points on a

Shipper Agreement.

b. The monthly imbalance under each Service Agreement will be the

difference between total receipts, minus reductions for Fuel, Lost

and Unaccounted for Gas, and total deliveries. The imbalance

level will be determined by dividing the imbalance quantity by the

total quantity of Gas received for Shipper's account during the

relevant Month under each Service Agreement. Transporter shall

cash out Shipper's entire Overage or Underage imbalance quantity

at a price equal to the product of the index percentage

corresponding to the Overage or Underage Imbalance Level, as

appropriate, and the imbalance quantity. For purposes of

calculating imbalances and determining the imbalance level,

imbalances will be aggregated for a Shipper (and its affiliates)

which has (have) multiple Service Agreements and the Overage or

Underage Imbalance Level for such Shipper(s) will be the

aggregated imbalance quantity divided by the total quantity of gas

received for Shipper(s)'s account(s) during the relevant month

under all of the Service Agreements of the Shipper (and its

affiliates).

c. The Overage Index Price is the arithmetic average of the lowest

price posted in the table "Natural Gas Weekly Spot Prices"

published by Energy Intelligence Natural Gas Week for sales during

the Month the imbalance occurred, under the column "$/MMBtu" for

(i) "Gulf Coast", "Col. Gulf - Erath"; (ii) "Gulf Coast", "Tenn

500 So La Z1"; and (iii) "Gulf Coast", "Tetco ELA".

d. The Underage Index Price is the arithmetic average of the highest

price posted in the table "Natural Gas Weekly Spot Prices"

published by Energy Intelligence Natural Gas Week for sales during

the Month the imbalance occurred, under the column "$/MMBtu" for

(i) "Gulf Coast", "Col. Gulf - Erath"; (ii) "Gulf Coast", "Tenn

500 So La Z1"; and (iii) "Gulf Coast", "Tetco ELA".