Western Gas Interstate Company

Fourth Revised Volume No. 1

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

First Revised Sheet No. 223 First Revised Sheet No. 223 : Effective

Superseding: Original Sheet No. 223

GENERAL TERMS AND CONDITIONS

(continued)

(ii) after commencement of a month, based upon flowing

gas quantities at the affected Receipt

Point(s) and Delivery Point(s) scheduled for

firm service over the previous Day and nominated

for the ensuing Day(s).

(2) Alternate Receipt and Delivery Point Capacity -

When capacity available to be scheduled for use among

firm Shippers is less than the quantity nominated and

confirmed at an Alternate Receipt Point or Delivery

Point, the capacity available for such firm service

at each affected Point shall be made available first

to firm Shippers whose Primary Receipt or Delivery

Point is within the same transportation path as the

Alternate Point, and shall then be prorated among

other firm Shippers based upon quantities nominated

for firm service at the affected Receipt Point(s)

and Delivery Point(s) for that Day.

(3) Mainline Capacity - When mainline capacity

available to be scheduled for use among firm

Shippers is less than the quantity nominated and

confirmed, the mainline capacity available for

such firm service shall be prorated among firm

Shippers such that the quantity available to be

scheduled for a given Shipper is the lesser of

(i) that Shipper's confirmed nomination and (ii)

the operational mainline capacity multiplied by

the quotient of that Shipper's MDTQ, and the sum

of the MDTQs of each Shipper who nominated affected

firm service. Western agrees to offer to enter

into contracts to provide firm service on a

first-come, first-served basis but only up to the

prudent operating limits of its system.

(4) Production and Gathering Capacity - When production

and gathering line capacity available to be

scheduled for use among firm Buyers and Shippers

is less than the quantity nominated and confirmed,