Rockies Express Pipeline LLC (Entrega)

Second Revised Volume No. 1

Effective Date: 09/01/2007, Docket: CP06-354-002, Status: Effective

Original Sheet No. 229 Original Sheet No. 229 : Effective

GENERAL TERMS AND CONDITIONS

18. MEASUREMENT (Contd.)

18.5 DETERMINATION OF GAS COMPOSITION, TOTAL HEATING VALUE AND SPECIFIC

GRAVITY (Contd.)

B. The Gas Composition, Total Heating Value and specific

gravity of the Gas may be determined by spot samples,

continuous samples, or a recording chromatograph. In the

event a continuous Gas sampling device is used, intervals

mutually agreed upon should not be less than once every

Month. For conventional chart measurement, the arithmetical

average of the Gas composition, hourly heating value and

specific gravity recorded during periods of flow each Day by

a recording chromatograph, if installed, shall be considered

as the Total Heating Value and specific gravity of the Gas

delivered during each Day. In the event electronic computer

measurement is used, the determination of Total Heating

Value and specific gravity from a chromatograph shall input

continuously into the computer for volume calculations. In

the event a continuous or spot Gas sampler is installed,

then the Total Heating Value and specific gravity shall be

determined in the laboratory by chromatograph and/or running

a portion of test sample through a calorimeter and

gravitometer. Such determinations shall be considered as

the Total Heating Value and specific gravity of all Gas

delivered. All Total Heating Value and specific gravity

determinations made with a chromatograph shall use physical

Gas constants for Gas compounds as outlined in GPA Std.

2145-00, Rev 1 Table of Physical Constants of Paraffin

Hydrocarbons and Other Components of Natural Gas, with any

subsequent amendments or revisions which Transporter may

adopt in exercise of its reasonable judgment. The

calculations (for Btu) shall be based on dry Gas if the Gas

at the measurement Points contains less than six (6) pounds

of water per MMcf. If the Gas at the measurement Points

contains more than six (6) pounds of water per MMcf, the Btu

value shall be corrected for the actual water vapor of the

flowing Gas based upon actual flowing conditions.

18.6 SUPERCOMPRESSIBILITY

The measurement hereunder shall be corrected for deviation from

Boyle's Law at the pressures and temperatures under which Gas is

measured hereunder by the use of the applicable meter standards

set forth in Section 18.1 of these General Terms and Conditions.