Washington Natural Gas Company

First Revised Volume No. 1

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Effective Date: 12/15/1995, Docket: CP95-300-001, Status: Effective

First Revised Sheet No. 21 First Revised Sheet No. 21 : Effective

Superseding: Original Sheet No. 21

FIRST REVISED APPENDIX A

TO

GAS STORAGE PROJECT AGREEMENT

A. Characteristics and Capabilities of the Jackson Prairie Storage Project for the 1995/1996 Storage Cycle

and

thereafter:

Cushion Gas:

Zone 2 Not less than 17.2 Bcf

Zone 9 Not less than 2.0 Bcf

Working Gas

Capacity Not more than 15.1 Bcf

Zone 2 Storage Gas Not more than

34.4 Bcf Deliverability:

Firm Not more than 550,000

Mcf Daily Best Efforts Up to

71,800 Mcf daily

B. Unless the Management Committee approves an alternate method, the Seasonal Working Gas Quantity available for withdrawal during any

Storage Cycle is determined by the lesser

of:

(1) The quantity of Working Gas in storage at the beginning of the Storage Cycle; or

(2) The least quantity of Working Gas in storage at any time between August 31st and September 30th of the preceding Storage Cycle divided by

0.80; or

(3) The least quantity of Working Gas in storage at any time between June 30th and September 30th of the precedent Storage Cycle divided by

0.35.

The maximum amount of Seasonal Working Gas Quantity is equivalent to the Working Gas Capacity and shall not exceed 15.1 Bcf, as stated above in

Section A.

C. During any Storage

Cycle, the Project Operator shall be

required to withdraw from the Storage

Project, upon demand by Northwest

Pipeline Corporation pursuant to

Section 6.3 of ARTICLE VI of the Gas

Storage Project Agreement, a daily

quantity of natural gas determined as

follows: