Dominion South Pipeline Co., LP

Original Volume No. 1

Effective Date: 12/16/2005, Docket: CP05- 77-001, Status: Effective

Original Sheet No. 1009 Original Sheet No. 1009 : Effective

GENERAL TERMS AND CONDITIONS

MEASUREMENT AND MEASUREMENT EQUIPMENT

3. MEASUREMENT AND MEASUREMENT EQUIPMENT

3.1 Measurement Unit. The unit of measure for all Gas Deliverable hereunder shall be one Dt,

measured as provided in this Section 3.

3.2 Quantity and Heating Value Determination. The quantity and heating value of Gas Received or

Delivered by Pipeline shall be determined as follows:

A. The unit of volume for the purpose of measurement shall be one cubic foot of Gas at 60

degrees Fahrenheit and dry and an absolute pressure of 14.73 pounds per square inch.

B. The average absolute atmospheric pressure shall be assumed to be fourteen and seven-

tenths pounds to the square inch (14.7 psi), irrespective of actual elevation or

location of the Point of Delivery above sea level or variations in such atmospheric

pressure from time to time.

C. The temperature of the Gas flowing through meters, when necessary for computing Gas

quantities, shall be determined for any Gas Day by the use of instantaneous temperature

measurements applied to measuring equipment, by the use of a properly installed

continuous recorder, or by assuming 60 degrees Fahrenheit for low volume meters. When

continuous recorders are used, the arithmetic average of the temperature recorded each

Gas Day shall be used to compute Gas quantities.

D. The specific gravity of the Gas shall be determined for any one Gas Day by the use of

instantaneous specific gravity measurements applied to metering instruments, by the use

of Gas Chromatography, or by approved methods with such reasonable frequency as is

found expedient in practice. The method of test used to determine specific gravity, in

the absence of continuous recording or instantaneous devices, shall be by the use of an

approved gravity instrument or fractional analysis.

E. The deviation of Gas from Ideal Gas Laws shall be calculated according to the

recommendations of the American Gas Association (AGA) Transmission Measurement

Committee Report No. 8 "Compressibility Factor of Natural Gas and Related Hydrocarbon

Gases," (1994) as may be amended or modified from time to time, or by other mutually

agreed upon methods.

1. Orifice meters shall be calculated according to AGA Report No. 3 Part 1 (1990),

Part 2 (2000), Part 3 (1992), and Part 4 (1992) as may be amended or modified from

time to time, or by other mutually agreed upon methods.

2. Turbine and displacement meters shall be calculated according to AGA Report No. 7

(1996) as may be amended or modified from time to time, or by other mutually agreed

upon methods.

3. Ultrasonic meters shall be calculated according to AGA Report No. 9, 1998, as may

be amended or modified from time to time, or by other mutually agreed upon methods.