Transwestern Pipeline Company, LLC

Third Revised Volume No. 1

Effective Date: 07/18/2010, Docket: RP10-853-000, Status: Effective

Third Revised Sheet No. 226 Third Revised Sheet No. 226

Superseding: Second Revised Sheet No. 226

DEFAULT

OPERATOR BALANCING AGREEMENT

FORM OF AGREEMENT

(continued)

1. Prior to the effective date of Shipper nominations at each Interconnect Point, the Parties shall

reconcile and confirm nominations received by each Party from Shippers for whom the Parties will be

delivering or receiving gas at that point. Such reconciliation and confirmation between the Parties

shall be made verbally with subsequent confirmation in writing, unless otherwise mutually agreed to by

the Parties. Except as provided in Section 3 below, any changes to such Scheduled Quantities during

the month shall be effective only if requested by Shipper or Company and agreed to in writing by both

Parties. Such written communication provided by the Parties regarding changes shall be in a form

mutually agreeable to the Parties. All nominations and confirmations must be made in accordance with

the requirements of Section 22 of the General Terms and Conditions of Transporter's Tariff. Provided

further, the terms and provisions of this OBA shall be subject to Sections 1 - Definitions; 2 -

Quality; 4 - Measurement; and 5 - Measurement Stations, of the General Terms and Conditions of

Transporter's FERC Gas Tariff, as may be revised from time to time.

2. The Parties intend that the volume of gas actually delivered and received each day at each Interconnect

Point will equal the Scheduled Quantities (including Transport Fuel) for that point. Each Party will

allocate volumes which are to be delivered and received at an Interconnect Point among the Shipper

Agreements on its system pursuant to the Scheduled Quantities received for that point. Any Operational

Imbalance created, when the actual physical flow is different than the Scheduled Quantities (on a

monthly basis), will be the "Operational Imbalance," which will be the responsibility of the Parties to

eliminate pursuant to this Agreement.

3. Estimated operating quantities flowing at each Interconnect Point shall be used on a daily basis during

any current month to determine the estimated Operational Imbalance at such Interconnect Point, with

physical flow adjustments to be made during that current month as mutually agreed to by both Parties to

attempt to maintain or achieve an Operational Imbalance of zero at such point; provided, however,

nothing herein shall affect Transporter's right to unilaterally re-schedule quantities upon 2-hour

notice by Transporter to the Shipper (except in the case of operational distress) under Section 22.3 of

the General Terms and Conditions of its FERC Gas Tariff, as may be revised from time to time.