Markwest New Mexico, L. L. C.

Second Revised Volume No. 1

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Effective Date: 08/01/2008, Docket: RP08-409-000, Status: Effective

Original Sheet No. 1 Original Sheet No. 1

FERC GAS TARIFF

SECOND REVISED VOLUME NO. 1

OF

MARKWEST NEW MEXICO, L.L.C.

FILED WITH THE

FEDERAL ENERGY REGULATORY COMMISSION

Communications Concerning This Tariff

Should Be Addressed To:

John C. Mollenkopf

Senior Vice President, Southwest Business Unit

MarkWest Energy Partners, L.P.

Telephone: (303) 925-9246

Facsimile: (303) 290-8769

MARKWEST NEW MEXICO, L.L.C.

1515 Arapahoe Street

Tower 2, Suite 700

Denver, CO 80202-2126

TABLE OF CONTENTS

Second Revised Volume No. 1

Description Sheet No.

PRELIMINARY STATEMENT 4

SYSTEM MAP 5

STATEMENT OF RATES AND CHARGES 6

RATE SCHEDULE FT FIRM TRANSPORTATION SERVICE 10

1. AVAILABILITY 10

2. APPLICABILITY AND CHARACTER OF SERVICE 10

3. RATES AND CHARGES 11

4. DELIVERY POINTS 12

5. NOMINATIONS AND SCHEDULING OF RECEIPTS AND

DELIVERIES 12

6. OVERRUN QUANTITIES AND IMBALANCES 12

7. RESERVATIONS 12

8. GOVERNMENTAL AUTHORIZATIONS 12

9. GENERAL TERMS AND CONDITIONS 13

RATE SCHEDULE IT INTERRUPTIBLE TRANSPORTATION

SERVICE 14

1. AVAILABILITY 14

2. APPLICABILITY AND CHARACTER OF SERVICE 14

3. RATES AND CHARGES 15

4. DELIVERY POINTS 15