El Paso Natural Gas Company

Second Revised Volume No. 1A

Effective Date: 04/01/2010, Docket: RP10-454-001, Status: Effective

Seventh Revised Sheet No. 314 Seventh Revised Sheet No. 314

Superseding: Sixth Revised Sheet No. 314

TRANSPORTATION GENERAL TERMS AND CONDITIONS

(Continued)

12. BILLING AND PAYMENT (Continued)

12.7 Adjustment of Overcharge and Undercharge. If it shall be found that

at any time or times, within the time limits of Section 12.8 of the

GT&C, Shipper has been overcharged or undercharged in any form

whatsoever under the provisions hereof as a result of an error in

billing for which Transporter is solely responsible and Shipper

shall have actually paid the bill containing such overcharge or

undercharge, then, unless mutually agreed otherwise, within thirty

(30) Days after the final determination thereof, and except where

otherwise required by statute, rule, regulation or order,

Transporter shall refund the amount of any such overcharge, with

interest thereon at the then effective rate computed in the same

manner as set forth in Section 12.4 of the GT&C, and Shipper shall

pay the amount of any such undercharge, with interest thereon at

the then effective rate computed in the same manner as set forth in

Section 12.4 of the GT&C.

12.8 Adjustment of Errors. In the event an error is discovered in any

invoice that Transporter renders, such error shall be adjusted

within thirty (30) Days of the determination thereof provided that

any claim for prior period adjustment must be made within six

Months from the date of the initial transportation invoice with a

three Month rebuttal period, except in the case of deliberate

omission or misrepresentation or mutual mistake of fact.