National Fuel Gas Supply Corporation

Fourth Revised Volume No. 1

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Effective Date: 04/21/2010, Docket: RP10-504-000, Status: Effective

First Revised Sheet No. 442 First Revised Sheet No. 442

Superseding: Original Sheet No. 442

GENERAL TERMS AND CONDITIONS

25. PROVISIONS APPLICABLE ONLY TO RATE SCHEDULES SS-1 AND SS-2 (Cont'd.)

25.2 Quality (Cont'd)

with the standards set forth in this section, and such

offering party in such instance shall reimburse such receiving

party for any reasonable expense incurred in effecting such

changes.

(c) Commingling. It is recognized that gas received by

Transporter from or for the account of Buyer will be

commingled with Transporter's gas or gas of other customers of

Transporter. Accordingly, gas shall be subject to changes in

total heating value as may result from such commingling and

Transporter shall, notwithstanding any other provision hereof,

be under no obligation to deliver to Buyer Volumes of Gas

equivalent to those received by Transporter from Buyer.

25.3 Measurement

(a) Measurement Units. The measurement unit of the gas delivered

by Transporter to Buyer and by Buyer to Transporter shall be

(a) an Mcf for purposes of determining Volume of Gas and (b) a

Dth for purposes of determining Quantity of Gas. Mcf

delivered shall be determined in accordance with Boyle's law

for the measurement of gas with deviations therefrom as

provided in subsection 3.6 on the measurement basis

hereinafter specified. Dth delivered shall be determined by

multiplying Mcf delivered by a fraction the numerator of which

is the Btu per cubic foot (dry) and the denominator of which

is the number 1,000.

(b) Total Heating Value. The total heating value per cubic foot

of gas shall be determined by either (1) the use of a suitably

located and acceptable make calorimeter, or (2) calculation

from fractional analysis, or (3) methods outlined in Report

No. 5 of the Gas Measurement Committee of the American Gas

Association, latest edition, or (4) other methods mutually

acceptable. Determination of total heating value per cubic

foot shall be made daily. Readings recorded during each day

shall be averaged, the average thus obtained shall be the

total heating value per cubic foot delivered during the

corresponding day.