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First Revised Sheet No. 98 First Revised Sheet No. 98 : Superseded

Superseding: Original Sheet No. 98

RATE SCHEDULE ISS (Continued)

INTERRUPTIBLE STORAGE SERVICE

(b)Withdrawals From Storage

(1) Buyer's MWQ shall be:

(a) West Area Storage Facilities

(i)1/100th of the MAQ until fifty percent

(50%) of the MAQ has been withdrawn;

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

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

until seventy-five percent (75%) of the

MAQ has been withdrawn;

(iii)Thereafter thirty-three percent (33%) of

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

above.

(b) East Area Storage Facilities

(i)1/67th of the MAQ until sixty percent

(60%) of the MAQ has been withdrawn;

(ii)Thereafter fifty percent (50%) of the

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

until eighty-five percent (85%) of the MAQ

has been withdrawn;

(iii)Thereafter twenty-five percent (25%) of

the volume specified in 6.3(b)(1)(b)(i)

above.

(2) Authorized Withdrawal Overrun Quantities

Upon request of Buyer, Seller may, but is not

obligated to, withdraw on any day quantities in

excess of Buyer s MWQ when, in Seller's sole

judgment, the capacity of its system will permit

such withdrawal without impairing the ability of

Seller to meet its other obligations. Buyer shall