UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

NOTICE OF EFFECTIVENESS

Effective Date: December 21, 2015
Accession Number: 0001104659-15-083621
Submission Type: POS AM
CIK: 0001166036
Company Name: MARKWEST ENERGY PARTNERS L P
File Number: 333-184605
CIK: 0001643186
Company Name: MarkWest Energy West Texas Gas Company, L.L.C.
File Number: 333-184605-33
CIK: 0001625169
Company Name: MarkWest Buffalo Creek Gas Company, L.L.C.
File Number: 333-184605-32
CIK: 0001625171
Company Name: MarkWest Energy South Texas Gas Company, L.L.C.
File Number: 333-184605-31
CIK: 0001565135
Company Name: MarkWest Texas LPG Pipeline, L.L.C.
File Number: 333-184605-29
CIK: 0001315263
Company Name: MarkWest Energy Finance CORP
File Number: 333-184605-28
CIK: 0001292406
Company Name: MarkWest Energy Operating CO LLC
File Number: 333-184605-27
CIK: 0001292408
Company Name: West Shore Processing CO LLC
File Number: 333-184605-26
CIK: 0001292409
Company Name: MarkWest Energy Appalachia LLC
File Number: 333-184605-25
CIK: 0001435921
Company Name: Mason Pipeline LTD Liability CO
File Number: 333-184605-24
CIK: 0001292411
Company Name: MarkWest Michigan Pipeline CO LLC
File Number: 333-184605-23
CIK: 0001292413
Company Name: MarkWest Oklahoma Gas CO LLC
File Number: 333-184605-22
CIK: 0001292419
Company Name: MarkWest New Mexico LLC
File Number: 333-184605-21
CIK: 0001292415
Company Name: MarkWest Pinnacle LLC
File Number: 333-184605-20
CIK: 0001292416
Company Name: MarkWest PNG Utility LLC
File Number: 333-184605-19
CIK: 0001292417
Company Name: MarkWest Texas PNG Utility LLC
File Number: 333-184605-18
CIK: 0001292418
Company Name: MarkWest Blackhawk LLC
File Number: 333-184605-17
CIK: 0001292414
Company Name: MarkWest Power Tex LLC
File Number: 333-184605-16
CIK: 0001315242
Company Name: MarkWest Pipeline CO LLC
File Number: 333-184605-15
CIK: 0001555528
Company Name: MarkWest Utica Operating Company, L.L.C.
File Number: 333-184605-14
CIK: 0001315262
Company Name: MarkWest Energy East Texas Gas CO LLC
File Number: 333-184605-13
CIK: 0001349175
Company Name: MarkWest Javelina CO LLC
File Number: 333-184605-12
CIK: 0001349174
Company Name: Markwest Javelina Pipeline CO LLC
File Number: 333-184605-11
CIK: 0001435926
Company Name: Matrex, L.L.C.
File Number: 333-184605-10
CIK: 0001435924
Company Name: MarkWest Liberty Gas Gathering, L.L.C.
File Number: 333-184605-09
CIK: 0001435923
Company Name: MarkWest Gas Services, L.L.C.
File Number: 333-184605-08
CIK: 0001412304
Company Name: MarkWest Energy GP, L.L.C.
File Number: 333-184605-07
CIK: 0001019756
Company Name: MARKWEST HYDROCARBON INC
File Number: 333-184605-06
CIK: 0001435922
Company Name: MarkWest Marketing, L.L.C.
File Number: 333-184605-05
CIK: 0001457473
Company Name: MarkWest Gas Marketing, L.L.C.
File Number: 333-184605-04
CIK: 0001457474
Company Name: MarkWest McAlester, L.L.C.
File Number: 333-184605-03
CIK: 0001512400
Company Name: MarkWest Ranger Pipeline Company, L.L.C.
File Number: 333-184605-02
CIK: 0001533090
Company Name: MarkWest Mountaineer Pipeline Company, L.L.C.
File Number: 333-184605-01
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