Midwestern Gas Transmission Company

Third Revised Volume No. 1

Effective Date: 12/16/2004, Docket: RP05- 72-000, Status: Effective

Third Revised Sheet No. 233 Third Revised Sheet No. 233 : Effective

Superseding: Second Revised Sheet No. 233

GENERAL TERMS AND CONDITIONS

4. MEASURING EQUIPMENT (Continued)

4.6 Correction of Metering Errors (Continued)

4.6.2 Measurement Data Correction

Company shall estimate missing or late measurement data and treat

actual as a prior period adjustment (PPA), with the measuring party to

provide the estimate. [2.3.13/v1.0]

For treatment of measurement prior period adjustments, Company shall

treat the adjustment by taking it back to the Production Month. A

meter adjustment becomes a prior period adjustment after the fifth

Business Day following the business month. [2.3.11/v1.0]

Measurement prior period adjustments shall be reported with the

restated line item with new total quantity for the day and the month.

[2.3.12/v1.0]

Measurement data corrections should be processed within 6 months of the

Production Month with a 3-month rebuttal period. This standard shall

not apply in the case of deliberate omission or misrepresentation or

mutual mistake of fact. Parties' other statutory or contractual rights

shall not otherwise be diminished by this standard. [2.3.14/v1.3]

4.7 Preservation of Metering Records

Company, Shipper, and Balancing Party shall each preserve for a period of at

least one year, all test data, charts, and other similar metering records.

5. INVOICING

5.1 General

Compensability of particular products or services shall be determined by

Company and its trading partners and/or by the FERC as applicable, but not by

NAESB WGQ. [1.1.6/v1.0]

5.2 Monthly Invoicing Date

On or before the 9th Business Day of the month after the end of the Production

Month, Company shall render to Customer, an invoice for such Production Month.

The imbalance statement should also be rendered prior to or with the invoice.

Rendered is defined as postmarked, time-stamped, and delivered to the

designated site. [3.3.14/v1.0]