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. 21 Original Sheet No. 21 : Effective

RATE SCHEDULE FSS (Continued)

FIRM STORAGE SERVICE

(2) East Area Storage Facilities

(a) 1/180th of the MAQ until seventy-five percent (75%)

of the MAQ has been injected;

(b) Thereafter sixty percent (60%) of the volume

specified in 2.2(A)(2)(a) above until ninety

percent (90%) of the MAQ has been injected;

(c) Thereafter forty percent (40%) of the volume

specified in 2.2(A)(2)(a) above.

(B) Authorized Injection Overrun Quantities

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

to, inject on any Day Quantities in excess of Shipper's MIQ

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

system will permit such injection without impairing the

ability of Southwest to meet its other obligations.

(C) Injection During the Withdrawal Season

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

to, inject on any Day during the Withdrawal Season Quantities

up to Shipper's MIQ and any Authorized Injection Overrun

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

of its system will permit such injection without impairing

the ability of Southwest to meet its other obligations.

2.3 Withdrawals from Storage

(A) Shipper's MWQ shall be:

(1) West Area Storage Facilities

(a) 1/100th of the MAQ until fifty percent (50%) of the

MAQ has been withdrawn;

(b) Thereafter sixty percent (60%) of the volume

specified in 2.3(A)(1)(a) above until seventy-five

percent (75%) of the MAQ has been withdrawn;

(c) Thereafter thirty-three percent (33%) of the volume

specified in 2.3(A)(1)(a) above.