Western Gas Interstate Company

Fourth Revised Volume No. 1

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Effective Date: 06/01/1997, Docket: RP97-160-001, Status: Effective

Original Sheet No. 208A Original Sheet No. 208A : Effective

GENERAL TERMS AND CONDITIONS

(continued)

6.2 Failure of Meters - In the event a meter is out of

service or registering inaccurately, the volume of

gas delivered shall be determined:

(a) By using the registration of any check meter

or meters, if installed and accurately

registering; or, in the absence of (a)

(b) By correcting the error if the percentage of

error is ascertainable by calibration, tests,

or mathematical calculations; or in the

absence of both (a) and (b), then

(c) By estimating the quantity of delivery during

a period under similar conditions when the

meter was registering accurately.

6.3 Measurement Prior Period Adjustments - (a) For

treatment of measurement prior period adjustments, the

adjustment will be treated 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. Measurement prior period

adjustments will be reported with the restated line item

with the new total quantity for the day and the month.

(b) Missing or late measurement data will be

estimated and actual measurement data will be

treated as a prior period adjustment, with the

measuring party to provide the estimate.