MarkWest Pioneer, L.L.C.

Original Volume No. 1

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Effective Date: 12/31/9999, Docket: RP09-367-000, Status: Accepted

Substitute Original Sheet No. 1 Substitute Original Sheet No. 1

Superseding: Original Sheet No. 1

ORIGINAL VOLUME NO. 1

TABLE OF CONTENTS

SECTION SHEET NO.

PRELIMINARY STATEMENT 3

SYSTEM MAP 4

STATEMENT OF RATES AND CHARGES 5

STATEMENT OF NEGOTIATED RATES 6

LIST OF NON-CONFORMING SERVICE AGREEMENTS 7

RATE SCHEDULE FT-1 10

RATE SCHEDULE FT-2 15

RATE SCHEDULE IT 21

GENERAL TERMS AND CONDITIONS 34

1. DEFINITIONS 34

2. GAS QUALITY 39

3. MEASUREMENT 43

4. MEASURING EQUIPMENT 46

5. PRESSURES AT RECEIPT AND DELIVERY POINTS 48

6. PROCEDURES FOR REQUESTING SERVICE 48

7. CREDITWORTHINESS 52

8. NOMINATIONS 57

9. SCHEDULING PRIORITY 63

10. CURTAILMENT PRIORITY 65

11. OPERATIONAL FLOW ORDERS 66

12. UNIFORM QUANTITIES 68

13. IMBALANCES AND OVERRUNS 69

14. CREDITING OF PENALTY REVENUES 72

15. NEGOTIATED RATES 72

16. DISCOUNTED RATES 74

17. ANNUAL CHARGE ADJUSTMENT 74

18. FUEL AND GAS LOSS RETENTION PERCENTAGES 76

19. BILLING AND PAYMENT 77

20. NEW FACILITIES POLICY 79

21. WARRANTY TO TITLE 80

22. CAPACITY RELEASE 81

23. RIGHT OF FIRST REFUSAL 93

24. SECONDARY POINT RIGHTS 95

25. COMMUNICATION REGARDING SERVICES 95

26. NORTH AMERICAN ENERGY STANDARDS BOARD (“NAESB”) STANDARD 98

27. IMPAIRMENT OF DELIVERIES/FORCE MAJEURE 100

28. LIABILITY 103

29. DEFAULTS AND REMEDIES 104

30. STANDARDS OF CONDUCT 105

31. OPERATIONAL PURCHASES AND SALES 106

32. MAXIMUM DAILY QUANTITY ADJUSTMENT 106

33. REGULATORY AUTHORITY 106