Southwest Gas Storage Company

First Revised Volume No. 1

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Effective Date: 12/15/1999, Docket: RP00- 58-000, Status: Effective

Original Sheet No. 28 Original Sheet No. 28 : Effective

RATE SCHEDULE ISS (Continued)

INTERRUPTIBLE STORAGE SERVICE

(2) East Area Storage Facilities

(a) 1/67th of the MAQ until sixty percent (60%) of the

MAQ has been withdrawn;

(b) Thereafter fifty percent (50%) of the volume

specified in 2.3(A)(2)(a) above until eighty-five

percent (85%) of the MAQ has been withdrawn;

(c) Thereafter twenty-five percent (25%) of the volume

specified in 2.3(A)(2)(a) above.

(B) Authorized Withdrawal Overrun Quantities

Upon request of Shipper, Southwest may, but is not obligated

to, withdraw on any Day Quantities in excess of Shipper's MWQ

when, in Southwest's sole judgment, the capacity of its

system will permit such withdrawal without impairing the

ability of Southwest to meet its other obligations. Shipper

shall pay Southwest the applicable Authorized Overrun Charge

for such Quantities as set forth on Sheet No. 5.

(C) Withdrawal During Injection Season

Upon request of Shipper, Southwest may, but is not obligated

to withdraw on any Day during the Injection Season Quantities

of Gas up to Shipper's MWQ and any Authorized Withdrawal

Overrun Quantities when, in Southwest's sole judgment, the

capacity of its system will permit such withdrawal without

impairing the ability of Southwest to meet its other

obligations.