Energy West Development, Inc.

Original Volume No. 1

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Effective Date: 06/11/2010, Docket: RP10-732-000, Status: Effective

First Revised Sheet No. 27A First Revised Sheet No. 27A

Superseding: Original Sheet No. 27A

(a) The L & U Percentage shall be based on the previous calendar year. Revisions to the

L & U Percentage shall be filed by no later than 30 days prior to the effective date

of the revised L & U Percentage and shall become effective on April 1 of each Year.

(b) The total actual monthly L & U quantities experienced over the previous calendar year

(“Actual L & U”) shall be divided by the total system throughput for the previous

calendar year (as adjusted for any known and measurable changes for the 12-Month

period beginning on the effective date of the filing). The resulting percentage

shall be rounded to the nearest 0.1% (“Actual L & U Percentage”).

(c) The total L & U quantities received from Shippers pursuant to the L & U Percentage

charged during the previous calendar year shall be subtracted from the Actual L & U

to determine the L & U True-Up Volume. The L & U True-Up Volume shall be divided by

the total system throughput for the previous calendar year (as adjusted for any known

and measurable changes for the 12-Month period beginning on the effective date of the

filing). The resulting percentage shall be rounded to the nearest 0.1% (“L & U True-Up

Adjustment”).

(d) The L & U True-Up Adjustment shall be added to the Actual L & U Percentage to determine

the L & U Percentage.