Questar Southern Trails Pipeline Company

Original Volume No. 1

Effective Date: 08/01/2009, Docket: RP09-780-000, Status: Effective

First Revised Sheet No. 33 First Revised Sheet No. 33

Superseding: Original Sheet No. 33

GENERAL TERMS AND CONDITIONS

necessary for safe operation by the testing party); inability of either party

to obtain necessary materials, supplies, permits, or labor to perform or

comply with any obligation or condition of this tariff; inability to obtain

rights of way; and any other causes, whether of the kind herein recited or

not, which are not reasonably in the control of the party claiming suspension.

1.18 Gas means combustible hydrocarbon gas.

1.19 Gross heating value means the number of British thermal units

produced by the combustion at a constant pressure, of the amount of gas that

would occupy a volume of one cubic foot at a temperature of 60 degrees

Fahrenheit on a water-free basis and under a pressure equivalent to that of

30.0 inches of mercury at 32 degrees Fahrenheit and under standard

gravitational force (acceleration of 980.665 cm/sec2) with air of the same

temperature and pressure as the gas, when the products of combustion are

cooled to the initial temperature of gas and air and when the water vapor

formed by combustion is condensed to the liquid state.

1.20 Imbalance means the difference between Shipper's scheduled

delivery and the quantity of gas received by Southern Trails from the Shipper

during the applicable nomination period adjusted for fuel use and lost and

unaccounted-for gas.

1.21 Inert substances means non-combustible substances contained in the

gas, including but not limited to helium, carbon dioxide and nitrogen.

1.22 Interruptible capacity means the sum of unsold and unnominated

firm capacity at a receipt or delivery point.

1.23 Interruption means reducing, suspending or discontinuing either

the receipt or delivery of gas.

1.24 Intra-day nomination is a nomination submitted after the

nomination deadline whose effective time is no earlier than the beginning of

the gas day and extends through the end of that gas day.

1.25 Mcf means l,000 cubic feet of gas. MMcf means 1,000,000 cubic

feet of gas.