MarkWest Pioneer, L.L.C.

Original Volume No. 1

Effective Date: 04/01/2009, Docket: RP09-321-000, Status: Effective

Original Sheet No. 58 Original Sheet No. 58

GENERAL TERMS AND CONDITIONS

(Continued)

8.2. If an upstream or downstream party requires additional information, if the

volumes transported are subject to a discounted rate, of if additional

information is otherwise required by Transporter, then, upon notification by

Transporter, Shipper must include in each nomination such additional

information as is specified by Transporter. Nominations must be submitted

to Transporter through Transporter’s Website, or such other means as are

mutually agreed upon by Transporter and Shipper. The sending party should

adhere to nomination, confirmation and scheduling deadlines. The receiving

party may waive any submittal deadline in this section.

8.3. The standard quantity for nominations, confirmation and scheduling is

MMBtu’s per day in the United States, gigajoules per day in Canada and

gigacalories per day in Mexico. (For reference, 1 dekatherm = 1,000,000

Btus; 1 gigajoule – 1,000,000,000 joules; and 1 gigacalorie = 1,000,000,000

calories.) For commercial purposes, the standard conversion factor between

MMBtu’s and gigajoules is 1.055056 gigajoules per MMBtu and between MMBtu’s

and gigacalories is 0.251996 gigacalories per MMBtu. The standard Btu is

the International Btu; the Standard joule is the joule specified in the SI

system of units. The International Btu is specified for use in the Gas

measurement standards of the American Gas Association, the American

Petroleum Institute, the Gas Processors Association and the American Society

for Testing Materials. For non-commercial purposes, these associations note

that the exact conversion factor is 1.05505585262 gigajoules per MMBtu.