MarkWest Pioneer, L.L.C.

Original Volume No. 1

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

Original Sheet No. 40 Original Sheet No. 40

GENERAL TERMS AND CONDITIONS

(Continued)

h) Shall have a Btu content no less than 980 Btu/cf and no

greater than 1100 Btu/cf.

i) Shall have a combined composition of not more than 1.5 mole

percentage of butane plus, including isobutene, normal butane and

all heavier hydrocarbons (C4+);

j) Shall contain not more than 3 percent by volume of nitrogen;

k) Shall not contain carbon monoxide, halogens or unsaturated

hydrocarbons and no more than 400 parts per million by volume of

hydrogen;

l) Shall have a combined composition of total inert gases

(principally nitrogen and carbon dioxide) of not more than 4 mole

percent; and

m) Shall have a Wobbe Index of not greater than 1,400

calculated using Higher Heating Value (“HHV”), dry, based on the

following mathematical definition:

HHV / (Sqrt (SGgas))

Where:HHV = Higher Heating Value (Btu/scf)

SGgas = Specific Gravity

Sqrt = Square Root of

2.1.2. Transporter may, from time to time, based on operational

circumstances establish and post on the Informational Postings

portion of its Website an upper limit on the dew point for receipts

on specified segments or other specified locations on its system to

prevent hydrocarbon fallout, to assure that Gas will be accepted for

delivery into downstream entities, or to otherwise manage the

operation of its System. Transporter will include in such posting

the anticipated duration of the limitation. Transporter will

provide as much prior notice as reasonably practicable and will

attempt to provide in the posting at least ten (10) Business Days

prior notice before the limitation becomes effective. If such prior