Southwest Gas Storage Company

Original Volume No. 1

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Effective Date: 01/20/1991, Docket: CP90-1014-002, Status: Effective

Original Sheet No. 93 Original Sheet No. 93 : Superseded

RATE SCHEDULE ISS (Continued)

INTERRUPTIBLE STORAGE SERVICE

(c) Commission or FERC shall mean the Federal Energy

Regulatory Commission or any successor regulatory

agency.

(d) Injection Season shall mean the months of April,

May, June, July, August, September, and October.

(e) Withdrawal Season shall mean the months of

November, December, January, February, and March.

(f) Storage Gas Balance shall mean the quantity of gas,

expressed in dekatherms, held by Seller in storage

for Buyer's account at any point in time.

(g) Average Storage Gas Balance shall mean the sum

of the daily Storage Gas Balance divided by

the number of days in a particular month.

(h) Maximum Annual Quantity (MAQ) shall mean the

maximum volume which Seller is obligated, on an

interruptible basis, to hold for the account of

Buyer.

(i) Maximum Daily Injection Quantity (MIQ) shall

mean the maximum quantity which Seller will

inject on an interruptible basis for Buyer on

any day during the Injection Season, as

described in Section 6.3(a) hereof.

(j) Maximum Daily Withdrawal Quantity (MWQ) shall

mean the maximum quantity which Seller will

withdraw on an interruptible basis for Buyer

on any day during the Withdrawal Season, as

described in Section 6.3(b) hereof.