Western Gas Interstate Company

Fourth Revised Volume No. 1

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Effective Date: 11/01/2003, Docket: RP00-461-004, Status: Effective

Substitute First Revised Sheet No. 224 Substitute First Revised Sheet No. 224 : Effective

Superseding: First Revised Sheet No. 224

GENERAL TERMS AND CONDITIONS

(continued)

the production and gathering line capacity available

for such firm services shall be prorated among firm

Buyers and Shippers such that the quantity available

to be scheduled for a given Buyer or Shipper is the

lesser of (i) that Buyer's or Shipper's confirmed

nomination and (ii) the operational production and

gathering line capacity multiplied by the quotient

of that Buyer's or Shipper's MDTQ or MDCQ, as the

case may be, and the sum of the MDTQs and MDCQs of

each Buyer and Shipper who nominated affected firm

service.

(b) Interruptible Capacity - Interruptible transportation shall

be offered on the basis of price. When capacity available

to be scheduled for use by interruptible shippers is less

than the quantity nominated and confirmed, capacity available

for such interruptible transportation shall be scheduled

first for the Shipper paying the highest rate. Capacity will

be prorated among interruptible Shippers that are paying

equal rates based on quantities nominated at the affected

Receipt Point(s) and Delivery Point(s), or mainline segment,

or production and gathering line, as the case may be.

(c) Discounted Capacity - Western reserves the right, on five

days notice, to interrupt service to an interruptible Shipper

paying less than the maximum rate Western is entitled to

charge for such service in order to enable Western to provide

service to another Shipper if such service would result in a

higher unit rate, excluding Retention Quantities, to Western.

The Shipper so affected may avoid such interruption by

immediately agreeing to pay such higher rate.

A shipper paying a discounted rate at a point may request

Western to retain the discount at secondary points if it

releases its capacity, or uses its flexible receipt and

delivery point rights to move gas to another point at which

Western is offering discounts for firm or interruptible

transportation service. Any such request received by Western

before 4:00 pm on any Business Day shall be granted unless

Western notifies the shipper within two hours of its receipt

of the request that the secondary point transaction is not

similarly situated to the transactions receiving the discount.

Requests received after 4:00 pm on any Business Day will be

acted on by 8:30 am Central Clock Time on the next Business

Day. Western shall bear the burden of justifying the denial

of the discount.