Western Gas Interstate Company

Fourth Revised Volume No. 1

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Effective Date: 07/01/2003, Docket: RP03-525-000, Status: Effective

Third Revised Sheet No. 137 Third Revised Sheet No. 137 : Effective

Superseding: Second Revised Sheet No. 137

RATE SCHEDULE RCS

FIRM TRANSPORTATION SERVICE - RELEASED CAPACITY

(continued)

6. POSTING OF RELEASED CAPACITY:

Any complete Capacity Release Notice and bids for released capacity

received by Western pursuant to Sections 4 or 5 of this Rate Schedule

shall be posted by Western on its Internet Web site upon receipt, in

accordance with the following timeline. The Releasing Shipper may

request that its Capacity Release Notice be posted at a time other

than upon Western's receipt thereof; however, such requested posting

time must comport with the standard timeline set forth below. All time

deadlines set forth in this Section 6 shall mean Central Clock Time.

(a) A prearranged release at Western's maximum tariff rates

applicable to the Transportation Rate Schedule FT-N under which

the capacity is being released shall not be posted for bidding;

however, it shall be posted for information purposes.

(b) For non-biddable releases, the following timeline shall apply:

(i) Timely Cycle - posting of prearranged deals not subject to bid

are due by 10:30 a.m.; (ii) Evening Cycle - posting of prearranged

deals not subject to bid are due by 5:00 p.m.; (iii) Intraday 1

Cycle - posting of prearranged deals not subject to bid are due by

9:00 a.m.; (iv) Intraday 2 Cycle - posting of prearranged deals not

subject to bid are due by 4:00 p.m. Contracts shall be issued

within one hour of posting (with a new contract number, when

applicable). Nomination will be possible at the next available

nomination cycle for the effective date of the contract.

(c) For biddable releases of less than one (1) year: (i) offers should

be tendered by 12:00 p.m. on a Business Day; (ii) open season ends

no later than 1:00 p.m. on a Busines Day (evaluation period begins

at 1:00 p.m. during which contingency is eliminated, determination

of best bid is made, and ties are broken) (iii) evaluation period

ends and award posting if no match is required at 2:00 p.m.; (iv)

match or award is communicated by 2:00 p.m.; (v) match response by

2:30 p.m.; (vi) where match is required, award posting by 3:00 p.m.;

(vii) contract issued within one hour of award posting (with a new

contract number, when applicable). Nomination is possible beginning

at the next available nomination cycle for the effective date of the

contract.