Questar Overthrust Pipeline Company

Second Revised Volume No. 1-A

Effective Date: 01/01/2008, Docket: RP07-169-004, Status: Effective

First Revised Sheet No. 84 First Revised Sheet No. 84 : Effective

Superseding: Original Sheet No. 84

(b) Overthrust will provide as much notice as reasonably

practical of any revisions to its CHDP zones. However, in no event will the

notice be less that 30 days.

shall post on its internet web site the prior gas day average and maximum

calculated CHDP at each receipt point. For receipt points without online

chromatographs, once per month Overthrust shall post on its internet web site

the average and maximum calculated CHDP at each receipt point for the prior

month period. Compliance with CHDP limits will be determined based on

calculated current flowing CHDP temperatures.

(d) CHDP Calculation. Overthrust shall perform the CHDP

calculations using an industry recognized equation of state and natural gas

chromatograph compositional analysis through C9. In the event of a dispute

over calculated CHDP temperature at a given receipt point, Overthrust's

calculated value shall control unless the disputing party can clearly

identify the cause of the error.

14.11 Shipper's Failure to Meet Specifications. Should any gas tendered

for receipt by Overthrust fail at any time to conform to any of the

specifications of this tariff, Overthrust shall have the right, upon

notification to Shipper, to refuse to accept all or any portion of such non-

conforming gas until such time as Shipper demonstrates to Overthrust's

satisfaction that the gas meets Overthrust's quality specifications. Such

refusal by Overthrust to receive non-conforming gas shall not relieve Shipper

of any of its obligations under this tariff. Overthrust may, on a

nondiscriminatory basis, elect to receive non-conforming gas in such

quantities and for such time periods as Overthrust determines will not

jeopardize its ability to meet its obligations to its customers or endanger

the safe operation of its transportation system.

14.12 Quality of Overthrust's Deliveries. Overthrust shall not be

required to process, treat or otherwise condition Shippers' gas to meet the

quality specifications of downstream pipelines or end users, including

Shipper. Overthrust shall deliver to Shipper gas which meets the quality

specifications set forth in §§ 14.1 through 14.10.

14.13 Commingling. Gas received from Shipper will be commingled with

the gas of other Shippers in the system. Accordingly, the gas of Shipper

shall be subject to such changes in gross heating value per cubic foot and

other specifications as may result from such commingling.