MarkWest Pioneer, L.L.C.

Original Volume No. 1

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Effective Date: 04/01/2009, Docket: RP09-321-000, Status: Effective

Original Sheet No. 46 Original Sheet No. 46





3.8. Prior Period Adjustments


Pursuant to NAESB Standards 2.3.7, 2.3.11, 2.3.12, 2.3.13, 2.3.14: The

cutoff for the closing of measurement is 5 business days after the business

month. For treatment of measurement prior period adjustments, 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. For reporting measurement prior period adjustments, report

it with the restated line item with new total quantity for the day and the

month. Estimate missing or late measurement data and treat actual as a

prior period adjustment, with the measuring party to provide the estimate.

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.




4.1. With respect to Gas received and delivered under a FT or IT Agreement,

unless otherwise mutually agreed upon, all measuring facilities shall be

installed, if necessary, owned, maintained and operated by Transporter or

Transporter’s designee near the Receipt Point and Delivery Point.


4.2. All meters and measuring equipment for the determination of volume, Gross

Heating Value and relative density shall be approved pursuant to, and

installed and maintained in accordance with, the currently published

standards of the American Gas Association, or as mutually agreed upon.

Notwithstanding the foregoing, all installation of equipment applying to or

affecting deliveries of Gas shall be made in such manner as to permit an

accurate determination of the quantity and Gross Heating Value of Gas

delivered and ready verification of the accuracy of measurement. Care shall

be exercised by all parties in the installation, maintenance and operation

of pressure regulating equipment so as to prevent any inaccuracy in the

determination of the energy of Gas delivered under the FT or IT Agreement.