Great Lakes Gas Transmission Limited Partner

Second Revised Volume No. 1

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Effective Date: / / , Docket: RP97- 55-001, Status: Effective

Pro Forma Sheet No. 20 Pro Forma Sheet No. 20 : Superseded

GENERAL TERMS AND CONDITIONS

____________________________

(continued)

during preceding periods under similar conditions when the meter was registering

accurately.

The correction period shall not exceed one (1) Year.

7.6 If at any time during the term of service a new method or technique is developed with respect

to gas measurement or the determination of the factors used in gas measurement, the new method

or technique may be substituted upon mutual agreement by both parties.

7.7 The parties agree to preserve for a period of at least three (3) Years or such longer period

as may be required by public authority, all test data, charts and other similar records.

8. QUALITY

8.1 Heat Content

Heat content shall mean the gross heating value per cubic foot of gas delivered at each point

of receipt and point of delivery. Gas delivered by Shipper to Transporter at each point of

receipt shall have a heat content not greater than 1069 Btu's per cubic foot nor less than 967

Btu's per cubic foot when determined on a pressure base of 14.73 psia and dry.

Transporter shall have the right to waive such Btu content limits if, in Transporter's sole

opinion, Transporter is able to accept gas with a Btu content outside such limits without

affecting Transporter's operations. The total heating value per cubic foot of gas shall be

determined at intervals of not more than thirty (30) Days by means of an instrument(s) of

standard manufacture accepted in the industry for this purpose or using a sample of gas

representative of the gas stream that is being delivered to Transporter or received from

Transporter at the point(s) of receipt or delivery.

In the event, however, that the heat content of Gas received by Transporter at any point

drops below the Btu level at which the MDQs of Transportation Service Agreements for

that receipt point are currently based and Transporter is unable to Transport Shipper's

Scheduled Daily Delivery from that receipt point due to the drop in the Btu level,

Transporter shall utilize the Curtailment provision of Section 11.4 of the General

Terms and Conditions.

For the purpose of calculating receipts and deliveries, the heat content of the gas so

determined at each such point shall be deemed to remain constant at such point until the next

determination. The unit of quantity for the purpose of determining total heating value shall

be one (1) cubic foot of gas on a dry basis at a temperature of sixty degrees (60ø) Fahrenheit

and an absolute pressure of 14.73 psia.

8.2 Freedom from Objectionable Odor and Matter

The gas received and delivered hereunder:

(a) shall be commercially free (at prevailing pressure and temperature) from objectionable

odors, dust, or other solid or liquid matter that might interfere with its

merchantability or cause injury to or interference with proper operation of the lines,

regulators, meters and other equipment of Transporter;

(b) shall not contain more than one quarter (1/4) grain of hydrogen sulfide per one

hundred (100) cubic feet of gas;

in any hydrogen sulfide and mercaptans) per one hundred (100) cubic feet of gas;

(d) shall not at any time have an oxygen content in excess of one percent (1%) by volume

and the parties shall make every reasonable effort to keep the gas free of oxygen;