Western Gas Interstate Company

Fourth Revised Volume No. 1

Effective Date: 11/01/2003, Docket: RP00-461-002, Status: Effective

Second Revised Sheet No. 242 Second Revised Sheet No. 242 : Effective

Superseding: First Revised Sheet No. 242

GENERAL TERMS AND CONDITIONS

(continued)

To access this information, potential shippers should contact:

Transportation and Exchange Services

Western Gas Interstate Company

211 North Colorado

Midland, TX 79701-4696

21.4 Western shall implement the following procedures to minimize

any advantages to its marketing affiliate:

(a) Western shall contemporaneously post on its Internet

Web site all capacity and transportation related

information that it provides to its marketing affiliate.

(b) Western shall identify all transportation agreements

with its marketing affiliate on its Internet Web site.

If Western offers a transportation discount in a

transaction in which an affiliated marketer is involved,

it will offer comparable discounts contemporaneously to

all similarly situated non-affiliated shippers. Western

will post notice of any such transaction involving an

affiliated marketer on its Internet Web site within 24

hours of the time at which gas first flows.

22. DULY CONSTITUTED AUTHORITIES:

These General Terms and Conditions, the rate schedules to which

they apply, and any executed Service Agreement for service hereunder

are subject to valid laws, orders, rules and regulations of duly

constituted authorities having jurisdiction.

23. SERVICE AGREEMENT:

23.1 Form of Agreement - Buyer or Shipper shall enter into a contract

with Western for service in the form contained in this tariff.

23.2 Term of Agreement - The period of time to be covered by the

executed Service Agreement shall be determined by agreement between

the parties but shall not be longer than twenty years; provided,

however, that where the Service Agreement supersedes or cancels

an existing contract, the