Midwest Gas Storage, Inc.

First Revised Volume No. 1

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Effective Date: 05/15/1994, Docket: CP90-454-004, Status: Effective

Original Sheet No. 520 Original Sheet No. 520 : Effective

preceding test, the previous recordings of such equipment

shall be corrected to zero error for any period which is

known definitely or agreed upon, such correction shall be

for a period extending over one-half of the time elapsed

since the date of the last test.

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. The Gas at each Point of

Receipt shall have a heat content not greater than 1200

BTUs per cubic foot nor less than 950 BTUs per cubic foot

when determined on a dry basis. Midwest shall have the

right to waive such BTU content limits if, in Midwest's

sole opinion, Midwest is able to accept Gas with a BTU

content outside such limits without affecting Midwest's

operations. The total heating value per cubic foot of Gas

shall be determined at each Point of Receipt and each Point

of Delivery by one of the following methods:

(a) by means of an instrument of standard manufacture

installed to measure the heating value of the Gas

being delivered at the Point of Receipt or the Point

of Delivery.

(b) at intervals of not more than six (6) Months by means

of an instrument of standard manufacture and a sample

of Gas from the Gas stream from which Gas is being

delivered at the Point of Receipt or the Point of

Delivery.

(c) other method mutually agreed upon by both parties.

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 at a temperature of sixty degrees (60ø)

Fahrenheit and an absolute pressure of 14.73 psia.

8.2 Freedom from Objectionable Matter. The Gas received and

delivered hereunder shall be merchantable Natural Gas and: