Midwest Gas Storage, Inc.

First Revised Volume No. 1

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

Original Sheet No. 522 Original Sheet No. 522 : Effective

(g) shall be delivered at a temperature not in excess of

one hundred twenty degrees (120ø) Fahrenheit or less

than forty degrees (40ø) Fahrenheit;

(h) shall not contain more than three percent (3%) by

volume of nitrogen;

(i) shall not contain any active bacteria or bacterial

agent, including, but not limited to, sulphate

reducing bacteria and acid producing bacteria;

(j) shall not contain any polychlorinated biphenyls; and

(k) shall not contain any hazardous or toxic substances.

8.3 Failure to Meet Specifications. Should any Gas tendered

for delivery hereunder fail at any time to conform to any

of the specifications of this Article, the affected Party

shall notify the other party of any such failure and the

affected party may at its option suspend all or a portion

of the receipt of any such Gas, and shall be relieved of

obligations hereunder for the duration of such time as the

Gas does not meet such specifications.

8.4 Commingling. It is recognized that Gas delivered by

Shipper will be commingled with other Gas stored hereunder

by Midwest. Accordingly, the Gas of Shipper shall be

subject to such changes in heat content as may result from

such commingling and Midwest shall, notwithstanding any

other provision herein, be under no obligation to redeliver

for Shipper's account, Gas of a heat content identical to

that caused to be delivered by Shipper to Midwest.

9. BILLING AND PAYMENT

9.1 Billing. On or before the tenth (10th) Day of each Month,

Midwest shall render to Shipper a statement of the amount

due for the preceding Month under the applicable Rate

Schedule(s). In computing the amounts due, Midwest may

utilize estimates of the quantity of Gas received from or

delivered to Shipper during a Month, in place of actual

quantities when actual quantities are not reasonably

available; provided that adjustments shall be made in later