a. NGL-to-crude oil ratio at 50% for 2013.b. NGL-to-crude oil ratio at 40% for 2013.c. NGL-to-crude oil ratio at 30% for 2013.

The analysis further assumes derivative instruments outstanding as of August 7, 2013, and production volumes estimated through December 31, 2013. The range of stated hypothetical changes in commodity prices considers current and historic market performance.

Estimated Range of 2013 DCF
                         
        Natural Gas Price (Henry Hub)

Crude Oil Price (WTI)
 

NGL-to-Crude Oil ratio (1)
  $3.00   $3.50   $4.00   $4.50   $5.00

 
50% of WTI   $ 548   $ 546   $ 543   $ 541   $ 539

$120
40% of WTI   $ 518   $ 516   $ 514   $ 512   $ 509
    30% of WTI   $ 490   $ 488   $ 486   $ 483   $ 481

 
50% of WTI   $ 540   $ 538   $ 535   $ 533   $ 531

$110
40% of WTI   $ 513   $ 511   $ 508   $ 506   $ 504
    30% of WTI   $ 486   $ 484   $ 482   $ 479   $ 477

 
50% of WTI   $ 530   $ 528   $ 526   $ 524   $ 521

$100
40% of WTI   $ 506   $ 504   $ 502   $ 499   $ 497
    30% of WTI   $ 481   $ 478   $ 476   $ 474   $ 472

 
50% of WTI   $ 519   $ 517   $ 515   $ 512   $ 510

$90
40% of WTI   $ 497   $ 495   $ 493   $ 491   $ 488
    30% of WTI   $ 474   $ 472   $ 470   $ 468   $ 465

 
50% of WTI   $ 509   $ 507   $ 505   $ 503   $ 500

$80
40% of WTI   $ 489   $ 486   $ 484   $ 482   $ 480
    30% of WTI   $ 470   $ 467   $ 465   $ 462   $ 459
(1)   The composition is based on MarkWest’s average projected barrel of approximately: Ethane: 35%, Propane: 35%, Iso-Butane: 6%, Normal Butane: 12%, Natural Gasoline: 12%.
 

The table is based on current information, expectations, and beliefs concerning future developments and their potential effects, and does not consider actions MarkWest management may take to mitigate exposure to changes. Nor does the table consider the effects that such hypothetical adverse changes may have on overall economic activity. Historical prices and ratios of NGL-to-crude oil do not guarantee future results.

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