Southwest Gas Storage Company

Original Volume No. 1

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Effective Date: 04/01/1999, Docket: CP97-237-001, Status: Effective

First Revised Sheet No. 97 First Revised Sheet No. 97 : Superseded

Superseding: Original Sheet No. 97

RATE SCHEDULE ISS (Continued)

INTERRUPTIBLE STORAGE SERVICE

(b) East Area Storage Facilities

(i)1/180th of the MAQ until seventy-five

percent (75%) of the MAQ has been

injected;

(ii)Thereafter sixty percent (60%) of the

volume specified in 6.3(a)(1)(b)(i) above

until ninety percent (90%) of the MAQ has

been injected;

(iii)Thereafter forty percent (40%) of the

volume specified in 6.3(a)(1)(b)(i) above.

(2) Authorized Injection Overrun Quantities

Upon request of Buyer, Seller may, but is not

obligated to, inject on any day quantities in

excess of Buyer s MIQ when, in Seller s sole

judgment, the capacity of its system will permit

such injection without impairing the ability of

Seller to meet its other obligations.

(3) Injection During the Withdrawal Season

Upon request of Buyer, Seller may, but is not

obligated to, inject on any day during the

Withdrawal Season quantities up to Buyer's MIQ and

any authorized Injection Overrun Quantities when,

in Seller s sole judgment, the capacity of its

system will permit such injection without impairing

the ability of Seller to meet its other

obligations.