Questar Southern Trails Pipeline Company

Original Volume No. 1

Effective Date: 06/01/2002, Docket: RP02-318-000, Status: Effective

Original Sheet No. 79 Original Sheet No. 79 : Effective

GENERAL TERMS AND CONDITIONS

13.5 Total Sulfur. The gas shall not contain more than

five grains of total sulfur per Mcf, of which not more than

two grains shall be mercaptan sulfur.

13.6 Oxygen. The gas shall not at any time have an

oxygen content in excess of ten parts per million by volume,

and the parties shall make every reasonable effort to keep the

gas free of oxygen.

13.7 Temperature. The gas shall be delivered at a

temperature not in excess of 120o Fahrenheit or less than 35o

Fahrenheit.

13.8 Inert Substances. The gas shall not contain inert

substances of more than three percent by volume, of which CO2

may not exceed two percent by volume.

13.9 Water Vapor. The gas shall not contain water vapor

in excess of seven pounds per million cubic feet.

13.10 Shipper's Failure to Meet Specifications. If

any gas tendered for receipt by Southern Trails fails at any

time to conform to any of the specifications of this tariff,

Southern Trails 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

Southern Trails' satisfaction that the gas meets Southern

Trails' quality specifications. Such refusal by Southern

Trails to receive non-conforming gas shall not relieve Shipper

of any of its obligations under this tariff. Southern Trails

may, on a nondiscriminatory basis elect to receive non-

conforming gas in such quantities and for such time periods as

Southern Trails determines will not jeopardize its ability to

meet its obligations to its customers or endanger the safe

operation of its transportation system.

13.11 Quality of Southern Trails' Deliveries. Southern

Trails shall deliver to Shipper or for Shipper's account gas

that is of merchantable quality.

13.12 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.