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Original Sheet No. 53 Original Sheet No. 53 : Superseded

RATE SCHEDULE FSS (Continued)

FIRM STORAGE SERVICE

6.1 Definitions

(a) Day shall mean a period of twenty-four (24)

consecutive hours beginning and ending at 8:00 A.M.

Central Time. The reference date for any day shall

be the date of the beginning of such day. ("Month"

and "years" shall also commence at 8:00 A.M.).

(b) Business Day shall mean from 8:00 A.M. to 5:00

P.M., Central Time on any day except Saturday,

Sunday, and holidays observed by Seller.

(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 to hold

for the account of Buyer.

(i) Maximum Daily Injection Quantity (MIQ) shall mean

the maximum quantity which Seller is obligated to

inject 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 is obligated to

withdraw for Buyer on any day during the Withdrawal

Season as described in Section 6.3(b) hereof.