Markwest New Mexico, L. L. C.

Second Revised Volume No. 1

Effective Date: 03/01/2009, Docket: RP09-242-000, Status: Effective

First Revised Sheet No. 145 First Revised Sheet No. 145

Superseding: Original Sheet No. 145

20.8 Term

(a) Any release under this Section 20 shall be for a minimum

term of at least one Gas Day.

(b) Any release under this Section 20 shall be for a maximum

term expiring on the earlier of:

(1) The last date this Tariff provision shall be

effective;

(2) The expiration date of Releasing Shipper's

Transportation Agreement when the release is for the

full term of such agreement; or

(3) The expiration date specified by the Releasing Shipper

in the Shipper Notice.

20.9 Billing Adjustments to Releasing Shipper

(a) Unless otherwise agreed upon by the Releasing Shipper,

Transporter shall credit Releasing Shipper's monthly bill to

reflect the Reservation Charge (including surcharges, if

any) invoiced to Replacement Shipper, provided however, that

Transporter and Releasing Shipper may, in connection with a

Negotiated Rate based on a rate design other than straight

fixed variable, agree upon a payment obligation and

crediting mechanism that varies from or is in addition to

the provisions of this Section 20.9 in order to establish

the basis of accounting for revenues from a Replacement

Shipper as a means of preserving the economic bases of the

Negotiated Rate. In the event of a release for a term of

more than one year with a volumetric rate, the volumetric

rate shall be no greater than the 100% load factor

equivalent of the maximum rate