Document:

Exhibit
4.01

October 20, 2006

 

REGISTRATION RIGHTS
AGREEMENT

This REGISTRATION
RIGHTS AGREEMENT dated October 20, 2006 (this ”Agreement”) is
entered into by and among MarkWest Energy Partners L.P., a limited partnership
organized under the laws of the State of Delaware (the “Partnership”),
MarkWest Energy Finance Corporation, a corporation organized under the laws of
the State of Delaware (“Finance Corp” and, together with the
Partnership, the “Issuers”), the guarantors listed
in Schedule 1 hereto (the “Guarantors”), and RBC Capital Markets
Corporation (the “Initial Purchaser”).

The Issuers, the
Guarantors and the Initial Purchaser are parties to that certain Purchase
Agreement dated as of October 16, 2006 (the “Purchase Agreement”), which
provides for the sale by the Issuers to the Initial Purchaser of $75,000,000
aggregate principal amount of the Issuers’ 8.500% Senior Notes due 2016 (the “Securities,”
which for purposes of clarity do not include the Issuers’ 8.500% Senior Notes
due 2016 issued under the Indenture in a private placement on July 6, 2006, the
“Prior Securities”) which will be guaranteed on an unsecured senior
basis by each of the Guarantors.  As an
inducement to the Initial Purchaser to enter into the Purchase Agreement, the
Issuers and the Guarantors have agreed to provide to the Initial Purchaser and its
direct and indirect transferees the registration rights set forth in this
Agreement.  The execution and delivery of
this Agreement is a condition to the closing under the Purchase Agreement.

In consideration
of the foregoing, the parties hereto agree as follows:

1.             Definitions.  As used in this Agreement, the following
terms shall have the following meanings:

“Business Day” shall have the meaning ascribed thereto in the
Indenture.

“DTC” shall
mean the Depository Trust Company.

“Exchange Act”
shall mean the Securities Exchange Act of 1934, as amended from time to time.

“Exchange Dates”
shall have the meaning set forth in Section 2(a)(ii) hereof.

“Exchange Offer”
shall mean the exchange offer by the Issuers and the Guarantors of Exchange
Securities for Registrable Securities pursuant to Section 2(a) hereof.

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“Exchange Offer
Registration” shall mean a registration under the Securities Act effected
pursuant to Section 2(a) hereof.

“Exchange Offer
Registration Statement” shall mean an exchange offer registration statement
on Form S-4 (or, if applicable, on another appropriate form), including the
registration statement on Form S-4 (File No. 333-136733) previously filed with
the SEC, and all amendments and supplements to such registration statement, in
each case including the Prospectus contained therein, all exhibits thereto and
any document incorporated by reference therein.

“Exchange
Securities” shall mean senior notes issued by the Issuers and guaranteed by
the Guarantors under the Indenture containing terms identical to the Securities
(except that the Exchange Securities will not be subject to restrictions on
transfer or to any increase in annual interest rate for failure to comply with
this Agreement) and to be offered to Holders of Securities in exchange for
Securities pursuant to the Exchange Offer.

“Finance Corp”
shall have the meaning set forth in the preamble and shall also include Finance
Corp’s successors.

“Guarantors”
shall have the meaning set forth in the preamble and shall also include any
Guarantor’s successors.

“Holders” shall
mean the Initial Purchaser, for so long as it owns any Registrable Securities,
and each of its successors, assigns and direct and indirect transferees who
become owners of Registrable Securities under the Indenture; provided that for
purposes of Sections 4 and 5 of this Agreement, the term “Holders” shall
include Participating Broker-Dealers.

“Indemnified
Person” shall have the meaning set forth in Section 5(c) hereof.

“Indemnifying
Person” shall have the meaning set forth in Section 5(c) hereof..

“Indenture”
shall mean the Indenture relating to the Securities dated as of July 6, 2006
among the Issuers, the Guarantors and Wells Fargo Bank, National Association,
as trustee, and as the same may be amended from time to time in accordance with
the terms thereof.

“Initial
Purchaser” shall have the meaning set forth in the preamble.

“Inspector”
shall have the meaning set forth in Section 3(a)(xiii) hereof.

“Issuer FWP”
shall have the meaning set forth in Section 5(a) hereof.

“Issuers”
shall have the meaning set forth in the preamble.

“Majority
Holders” shall mean the Holders of a majority of the aggregate principal
amount of the outstanding Registrable Securities; provided that whenever the 

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consent or approval of
Holders of a specified percentage of Registrable Securities is required
hereunder, any Registrable Securities owned directly or indirectly by the
Issuers or any of their affiliates shall not be counted in determining whether
such consent or approval was given by the Holders of such required percentage
or amount; and provided, further, that if the Issuers shall issue any
additional Securities under the Indenture prior to consummation of the Exchange
Offer or, if applicable, the effectiveness of any Shelf Registration Statement,
such additional Securities and the Registrable Securities to which this
Agreement relates shall be treated together as one class for purposes of
determining whether the consent or approval of Holders of a specified
percentage of Registrable Securities has been obtained.

“Participating
Broker-Dealers” shall have the meaning set forth in Section 4(a) hereof.

“Partnership”
shall have the meaning set forth in the preamble and shall also include the Partnership’s
successors.

“Person”
shall mean an individual, partnership, limited liability company, corporation,
trust or unincorporated organization, or a government or agency or political
subdivision thereof.

“Prior
Securities” shall have the meaning set forth in the preamble.

“Prospectus”
shall mean the prospectus included in a Registration Statement, including any
preliminary prospectus, and any such prospectus as amended or supplemented by
any prospectus supplement, including a prospectus supplement with respect to
the terms of the offering of any portion of the Registrable Securities covered
by a Shelf Registration Statement, and by all other amendments and supplements
to such prospectus, and in each case including any document incorporated by
reference therein.

“Purchase
Agreement” shall have the meaning set forth in the preamble.

“Registrable
Securities” shall mean the Securities; provided that the Securities shall
cease to be Registrable Securities (i) when a Registration Statement with
respect to such Securities has been declared effective under the Securities Act
and such Securities have been exchanged or disposed of pursuant to such
Registration Statement, (ii) when such Securities are eligible to be sold
pursuant to Rule 144(k) (or any similar provision then in force, but not Rule
144A) under the Securities Act or (iii) when such Securities cease to be
outstanding.

“Registration
Expenses” shall mean any and all expenses incident to performance of or
compliance by the Issuers and the Guarantors with this Agreement, including
without limitation: (i) all SEC, stock exchange or National Association of
Securities Dealers, Inc. registration and filing fees, (ii) all fees and
expenses incurred in connection with compliance with state securities or blue sky
laws (including reasonable fees and disbursements of counsel for any
Underwriters or Holders in connection with blue sky 

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qualification of any
Exchange Securities or Registrable Securities), (iii) all expenses of any
Persons in preparing or assisting in preparing, word processing, printing and
distributing any Registration Statement, any Prospectus and any amendments or
supplements thereto, any underwriting agreements, securities sales agreements
or other similar agreements and any other documents relating to the performance
of and compliance with this Agreement, (iv) all rating agency fees, (v) all
fees and disbursements relating to the qualification of the Indenture under
applicable securities laws, including without limitation the Trust Indenture
Act, (vi) the fees and disbursements of the Trustee and its counsel, (vii) the
fees and disbursements of counsel for the Issuers and the Guarantors and, in
the case of a Shelf Registration Statement, the fees and disbursements of one
counsel for the Holders (which counsel shall be selected by the Majority
Holders and which counsel may also be counsel for the Initial Purchaser) and
(viii) the fees and disbursements of the independent public accountants of the
Issuers and the Guarantors, including the expenses of any special audits or “comfort”
letters required by or incident to the performance of and compliance with this
Agreement, but excluding fees and expenses of counsel to the Underwriters
(other than fees and expenses set forth in clause (ii) above) or the Holders
and underwriting discounts and commissions, brokerage commissions and transfer
taxes, if any, relating to the sale or disposition of Registrable Securities by
a Holder.

“Registration
Statement” shall mean any registration statement of the Issuers and the
Guarantors that covers any of the Exchange Securities or Registrable Securities
pursuant to the provisions of this Agreement and all amendments and supplements
to any such registration statement, including post-effective amendments, in
each case including the Prospectus contained therein, all exhibits thereto and
any document incorporated by reference therein.

“SEC” shall
mean the United States Securities and Exchange Commission.

“Securities”
shall have the meaning set forth in the preamble.

“Securities Act”
shall mean the Securities Act of 1933, as amended from time to time.

“Shelf
Effectiveness Period” shall have the meaning set forth in Section 2(b)
hereof.

“Shelf
Registration” shall mean a registration effected pursuant to Section 2(b)
hereof.

“Shelf
Registration Statement” shall mean a “shelf” registration statement of the
Issuers and the Guarantors that covers all or a portion of the Registrable
Securities (but no other securities unless approved by the Holders of a
majority of the Registrable Securities to be covered by such Shelf Registration
Statement) on an appropriate form under Rule 415 under the Securities Act, or
any similar rule that may be adopted by the SEC, and all amendments and
supplements to such registration statement, including 

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post-effective
amendments, in each case including the Prospectus contained therein, all
exhibits thereto and any document incorporated by reference therein.

“Staff”
shall mean the staff of the SEC.

“Target
Registration Date” shall have the meaning set for in Section 2(d) hereof.

“Trust
Indenture Act” shall mean the Trust Indenture Act of 1939, as amended from
time to time.

“Trustee”
shall mean the trustee with respect to the Securities under the Indenture.

“Underwriter”
shall have the meaning set forth in Section 3(f) hereof.

“Underwritten
Offering” shall mean an offering in which Registrable Securities are sold
to an Underwriter for reoffering to the public.

2.             Registration Under the
Securities Act.  (a)  To the extent not prohibited by any
applicable law or applicable interpretations of the Staff, the Issuers and the
Guarantors shall use their reasonable best efforts to cause to be filed an
Exchange Offer Registration Statement covering an offer to the Holders to
exchange all the Registrable Securities for Exchange Securities.  The Issuers and the Guarantors shall commence
the Exchange Offer promptly after the Exchange Offer Registration Statement is
declared effective by the SEC and use their reasonable best efforts to complete
the Exchange Offer not later than 60 days after such effective date.

The Issuers and
the Guarantors shall commence the Exchange Offer by mailing the related
Prospectus, appropriate letters of transmittal and other accompanying documents
to each Holder stating, in addition to such other disclosures as are required
by applicable law, substantially the following:

(i)                                     that
the Exchange Offer is being made pursuant to this Agreement and that all
Registrable Securities validly tendered and not properly withdrawn will be
accepted for exchange;

(ii)                                  the
dates of acceptance for exchange (which shall be a period of at least 20
Business Days from the date such notice is mailed) (the “Exchange Dates”);

(iii)                               that
any Registrable Security not tendered will remain outstanding and continue to
accrue interest but will not retain any rights under this Agreement;

(iv)                              that
any Holder electing to have a Registrable Security exchanged pursuant to the
Exchange Offer will be required, (x) in the case a Holder electing to exchange
a Registrable Security in global form, to comply with the applicable procedures
of DTC for book-entry tenders, and, (y) in the case of a Holder electing to
exchange a Registrable Security in certificated form, to surrender such
Registrable Security, 

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together with the appropriate letters of transmittal,
to the institution and at the address (located in the Borough of Manhattan, The
City of New York) and in the manner specified in the notice, prior to the close
of business on the last Exchange Date; and

(v)                                 that
any Holder will be entitled to withdraw its election, not later than the close
of business on the last Exchange Date, by, (x) in the case of a Holder
withdrawing its election to exchange a Registrable Security in global form,
complying with the applicable procedures of DTC for withdrawal of tenders, and,
(y) in the case of a Holder withdrawing its election to exchange a Registrable
Security in certificated form, sending to the institution and at the address
(located in the Borough of Manhattan, The City of New York) specified in the
notice, a telegram, facsimile transmission or letter setting forth the name of
such Holder, the principal amount of Registrable Securities delivered for
exchange and a statement that such Holder is withdrawing its election to have
such Securities exchanged.

As
a condition to participating in the Exchange Offer, a Holder will be required
to represent to the Issuers and the Guarantors that (i) any Exchange Securities
to be received by it will be acquired in the ordinary course of its business,
(ii) at the time of the commencement of the Exchange Offer it has no
arrangement or understanding with any Person to participate in the distribution
(within the meaning of the Securities Act) of the Exchange Securities in
violation of the provisions of the Securities Act, (iii) it is not an “affiliate”
(within the meaning of Rule 405 under the Securities Act) of either of the
Issuers or any Guarantor and (iv) if such Holder is a broker-dealer that will
receive Exchange Securities for its own account in exchange for Registrable
Securities that were acquired as a result of market-making or other trading
activities, then such Holder will deliver a Prospectus in connection with any
resale of such Exchange Securities.

As soon as
practicable after the last Exchange Date, the Issuers and the Guarantors shall:

(i)                                     accept
for exchange Registrable Securities or portions thereof validly tendered and
not properly withdrawn pursuant to the Exchange Offer; and

(ii)                                  deliver,
or cause to be delivered, to the Trustee for cancellation all Registrable
Securities or portions thereof so accepted for exchange by the Issuers and
issue, and cause the Trustee to promptly authenticate and deliver to each
Holder, Exchange Securities equal in principal amount to the principal amount
of the Registrable Securities surrendered by such Holder.

The Issuers and
the Guarantors shall use their reasonable best efforts to complete the Exchange
Offer as provided above and shall comply with the applicable requirements of
the Securities Act, the Exchange Act and other applicable laws and regulations
in connection with the Exchange Offer. 
The Exchange Offer shall not be subject to any conditions, other than
that the Exchange Offer does not violate any applicable law or applicable
interpretations of the Staff.

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(b)           In the event that (i) the Issuers and
the Guarantors determine that the Exchange Offer Registration provided for in
Section 2(a) above is not available or may not be completed as soon as
practicable after the last Exchange Date because it would violate any
applicable law or applicable interpretations of the Staff, (ii) the Exchange
Offer is not for any other reason completed by April 20, 2007 or (iii) the Initial Purchaser shall so request in
connection with any offer or sale of Registrable Securities that are not
eligible to be exchanged for Exchange Securities, the Issuers and the
Guarantors shall use their reasonable best efforts to cause to be filed as soon
as practicable after such determination, date or request, as the case may be, a
Shelf Registration Statement providing for the sale of all the Registrable
Securities by the Holders thereof and to have such Shelf Registration Statement
declared effective by the SEC.

In the event that
the Issuers and the Guarantors are required to file a Shelf Registration
Statement pursuant to clause (iii) of the preceding sentence, the Issuers and
the Guarantors shall use their reasonable best efforts to file and have
declared effective by the SEC both an Exchange Offer Registration Statement
pursuant to Section 2(a) with respect to all Registrable Securities and a Shelf
Registration Statement (which may be a combined Registration Statement with the
Exchange Offer Registration Statement) with respect to offers and sales of
Registrable Securities held by the Initial Purchaser after completion of the
Exchange Offer.

The Issuers and
the Guarantors agree to use their reasonable best efforts to keep the Shelf
Registration Statement continuously effective until the expiration of the
period referred to in Rule 144(k) (or any similar rule then in force, but not
Rule 144A) under the Securities Act with respect to the Registrable Securities
or such shorter period that will terminate when all the Registrable Securities
covered by the Shelf Registration Statement have been sold pursuant to the
Shelf Registration Statement (the “Shelf Effectiveness Period”).  The Issuers and the Guarantors further agree
to supplement or amend the Shelf Registration Statement and the related
Prospectus if required by the rules, regulations or instructions applicable to
the registration form used by the Issuers for such Shelf Registration Statement
or by the Securities Act or by any other rules and regulations thereunder for
shelf registration or if reasonably requested by a Holder of Registrable
Securities with respect to information relating to such Holder, and to use
their reasonable best efforts to cause any such amendment to become effective
and such Shelf Registration Statement and Prospectus to become usable as soon
as thereafter practicable.  The Issuers
and the Guarantors agree to furnish to the Holders of Registrable Securities
copies of any such supplement or amendment promptly after its being used or
filed with the SEC.

(c)           The Issuers and the Guarantors shall
pay all Registration Expenses in connection with any registration pursuant to
Section 2(a) or Section 2(b) hereof. 
Each Holder shall pay all underwriting discounts and commissions,
brokerage commissions and transfer taxes, if any, relating to the sale or
disposition of such Holder’s Registrable Securities pursuant to the Shelf
Registration Statement.

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(d)           An Exchange Offer Registration
Statement pursuant to Section 2(a) hereof or a Shelf Registration Statement
pursuant to Section 2(b) hereof will not be deemed to have become effective
unless it has been declared effective by the SEC.

In the event that
either the Exchange Offer is not completed or the Shelf Registration Statement,
if required hereby, is not declared effective on or prior to April 20, 2007 (the
“Target Registration Date”), the interest rate on the Registrable
Securities will be increased by (i) 0.50% per annum for the first 90-day period
immediately following the Target Registration Date and (ii) an additional 0.25%
per annum with respect to each subsequent 90-day period, in each case until the
Exchange Offer is completed or the Shelf Registration Statement, if required
hereby, is declared effective by the SEC or the Securities become freely
tradable under the Securities Act, up to a maximum of 1.00% per annum of
additional interest; provided that if an obligation to file a Shelf
Registration Statement arises pursuant to Section 2(b)(iii) and the Initial
Purchaser does not make the request to file a Shelf Registration Statement by February
20, 2007 then the Target Registration Date shall be extended by the number of
days from and including February 20, 2007 to and
including the date on which such request is made.

If the Shelf
Registration Statement, if required hereby, has been declared effective and
thereafter either ceases to be effective or the Prospectus contained therein
ceases to be usable at any time during the Shelf Effectiveness Period, and such
failure to remain effective or usable exists for more than 60 days (whether or
not consecutive) in any 12-month period, then the interest rate on the
Registrable Securities will be increased by (i) 0.50% per annum commencing on
the 61st day in such 12-month period and (ii) an additional 0.25% per annum
with respect to each subsequent 90-day period (whether or not consecutive) and
ending on such date that the Shelf Registration Statement has again been
declared effective or the Prospectus again becomes usable, up to a maximum of
1.00% per annum of additional interest.

(e)           Without limiting the remedies
available to the Initial Purchaser and the Holders, the Issuers and the
Guarantors acknowledge that any failure by the Issuers or the Guarantors to
comply with their obligations under Section 2(a) and Section 2(b) hereof may
result in material irreparable injury to the Initial Purchaser or the Holders
for which there is no adequate remedy at law, that it will not be possible to
measure damages for such injuries precisely and that, in the event of any such
failure, the Initial Purchaser or any Holder may obtain such relief as may be
required to specifically enforce the Issuers’ and the Guarantors’ obligations
under Section 2(a) and Section 2(b) hereof.

(f)            The parties understand and agree
that any Registration Statement filed in connection with the Issuers’ and the
Guarantors’ obligations pursuant to Section 2(a) and 2(b) hereof may also be
used in connection with the Issuers’ and the Guarantors’ obligations arising
under that certain Registration Rights Agreement, dated July 6, 2006, among the
Issuers, the Guarantors and the initial purchasers named therein relating to
the Prior Securities, but that fact shall not relieve the Issuers or the
Guarantors of any obligation arising hereunder.

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3.             Registration Procedures.  (a) In connection with their obligations
pursuant to Section 2(a) and Section 2(b) hereof, the Issuers and the
Guarantors shall as expeditiously as possible:

(i)            prepare and file with the SEC a
Registration Statement on the appropriate form under the Securities Act, which
form (x) shall be selected by the Issuers and the Guarantors, (y) shall, in the
case of a Shelf Registration, be available for the sale of the Registrable
Securities by the Holders thereof and (z) shall comply as to form in all
material respects with the requirements of the applicable form and include all
financial statements required by the SEC to be filed therewith; and use their
reasonable best efforts to cause such Registration Statement to become
effective and remain effective for the applicable period in accordance with
Section 2 hereof;

(ii)           prepare and file with the SEC such
amendments and post-effective amendments to each Registration Statement as may
be necessary to keep such Registration Statement effective for the applicable
period in accordance with Section 2 hereof and cause each Prospectus to be supplemented
by any required prospectus supplement and, as so supplemented, to be filed
pursuant to Rule 424 under the Securities Act; and keep each Prospectus current
during the period described in Section 4(3) of and Rule 174 under the
Securities Act that is applicable to transactions by brokers or dealers with
respect to the Registrable Securities or Exchange Securities;

(iii)          in the case of a Shelf Registration,
furnish to each Holder of Registrable Securities, to counsel for the Initial Purchaser,
to counsel for such Holders and to each Underwriter of an Underwritten Offering
of Registrable Securities, if any, without charge, as many copies of each
Prospectus, including each preliminary Prospectus, and any amendment or
supplement thereto, in order to facilitate the sale or other disposition of the
Registrable Securities thereunder; and the Issuers and the Guarantors consent
to the use of such Prospectus and any amendment or supplement thereto in
accordance with applicable law by each of the Holders of Registrable Securities
and any such Underwriters in connection with the offering and sale of the
Registrable Securities covered by and in the manner described in such
Prospectus or any amendment or supplement thereto in accordance with applicable
law;

(iv)          use their reasonable best efforts to
register or qualify the Registrable Securities under all applicable state
securities or blue sky laws of such jurisdictions in the United States as any
Holder of Registrable Securities covered by a Registration Statement shall
reasonably request in writing by the time the applicable Registration Statement
is declared effective by the SEC; cooperate with such Holders in connection
with any filings required to be made with the National Association of
Securities Dealers, Inc.; and do any and all other acts and things that may be
reasonably necessary or advisable to enable each Holder to complete the
disposition in each such jurisdiction of the Registrable Securities owned by
such Holder; provided that none of the Issuers or the Guarantors shall
be required to (1) qualify as a foreign corporation or other entity or as a
dealer in securities in any such jurisdiction where it would not otherwise be
required to so 

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qualify, (2) file any
general consent to service of process in any such jurisdiction or (3) subject
itself to taxation in any such jurisdiction if it is not so subject;

(v)           in the case of a Shelf Registration,
notify each Holder of Registrable Securities, counsel for such Holders and
counsel for the Initial Purchaser promptly and, if requested by any such Holder
or counsel, confirm such advice in writing (1) when a Registration Statement
has become effective and when any post-effective amendment thereto has been
filed and becomes effective, (2) of any request by the SEC or any state
securities authority for amendments and supplements to a Registration Statement
and Prospectus or for additional information after the Registration Statement
has become effective, (3) of the issuance by the SEC or any state securities
authority of any stop order suspending the effectiveness of a Registration
Statement or the initiation of any proceedings for that purpose, (4) if,
between the effective date of a Registration Statement and the closing of any
sale of Registrable Securities covered thereby, the representations and
warranties of either of the Issuers or any Guarantor contained in any
underwriting agreement, securities sales agreement or other similar agreement,
if any, relating to an offering of such Registrable Securities cease to be true
and correct in all material respects or if either of the Issuers or any
Guarantor receives any notification with respect to the suspension of the
qualification of the Registrable Securities for sale in any jurisdiction or the
initiation of any proceeding for such purpose, (5) of the happening of any
event during the period a Shelf Registration Statement is effective that makes
any statement made in such Registration Statement or the related Prospectus
untrue in any material respect or that requires the making of any changes in
such Registration Statement or Prospectus in order to make the statements
therein not misleading and (6) of any determination by either of the Issuers or
any Guarantor that a post-effective amendment to a Registration Statement would
be appropriate;

(vi)          use their reasonable best efforts to
obtain the withdrawal of any order suspending the effectiveness of a
Registration Statement at the earliest possible moment and provide immediate
notice to each Holder of the withdrawal of any such order;

(vii)         in the case of a Shelf Registration,
furnish to each Holder of Registrable Securities, without charge, at least one
conformed copy of each Registration Statement and any post-effective amendment
thereto (without any documents incorporated therein by reference or exhibits
thereto, unless requested);

(viii)        in the case of a Shelf Registration,
cooperate with the Holders of any Registrable Securities in certificated form
to facilitate the timely preparation and delivery of certificates representing
Registrable Securities to be sold and not bearing any restrictive legends and
enable such Registrable Securities to be issued in such denominations and
registered in such names (consistent with the provisions of the Indenture) as
such Holders may reasonably request at least one Business Day prior to the
closing of any sale of Registrable Securities in certificated form;

(ix)           in the case of a Shelf Registration,
upon the occurrence of any event contemplated by Section 3(a)(v)(5) hereof, use
their reasonable best efforts to prepare 

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and file with the SEC a
supplement or post-effective amendment to such Shelf Registration Statement or
the related Prospectus or any document incorporated therein by reference or
file any other required document so that, as thereafter delivered to purchasers
of the Registrable Securities, such Prospectus will not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements therein, in the light of the circumstances under which they were
made, not misleading; and the Issuers and the Guarantors shall notify the
Holders of Registrable Securities to suspend use of the Prospectus as promptly
as practicable after the occurrence of such an event, and such Holders hereby
agree to suspend use of the Prospectus until the Issuers and the Guarantors
have amended or supplemented the Prospectus to correct such misstatement or
omission;

(x)            a reasonable time prior to the
filing of any Registration Statement, any Prospectus, any amendment to a Registration
Statement or amendment or supplement to a Prospectus or of any document that is
to be incorporated by reference into a Registration Statement or a Prospectus
after initial filing of a Registration Statement, provide copies of such document
to the Initial Purchaser and its counsel (and, in the case of a Shelf
Registration Statement, to the Holders of Registrable Securities and their
counsel) and make such of the representatives of the Issuers and the Guarantors
as shall be reasonably requested by the Initial Purchaser or its counsel (and,
in the case of a Shelf Registration Statement, the Holders of Registrable
Securities or their counsel) available for discussion of such document; and the
Issuers and the Guarantors shall not, at any time after initial filing of a
Registration Statement, file any Prospectus, any amendment of or supplement to
a Registration Statement or a Prospectus, or any document that is to be
incorporated by reference into a Registration Statement or a Prospectus, of
which the Initial Purchaser and its counsel (and, in the case of a Shelf
Registration Statement, the Holders of Registrable Securities and their
counsel) shall not have previously been advised and furnished a copy or to
which the Initial Purchaser or its counsel (and, in the case of a Shelf
Registration Statement, the Holders of Registrable Securities or their counsel)
shall object; provided, that this clause shall not apply to any filing
by the Partnership of any Annual Report on Form 10-K, Quarterly Report on Form
10-Q or Current Report on Form 8-K with respect to matters unrelated to the
Securities and the offering or exchange therefor;

(xi)           obtain a CUSIP number for all
Exchange Securities or Registrable Securities, as the case may be, not later
than the effective date of a Registration Statement;

(xii)          cause the Indenture to be qualified
under the Trust Indenture Act in connection with the registration of the
Exchange Securities or Registrable Securities, as the case may be; cooperate
with the Trustee and the Holders to effect such changes to the Indenture as may
be required for the Indenture to be so qualified in accordance with the terms
of the Trust Indenture Act; and execute, and use their reasonable best efforts
to cause the Trustee to execute, all documents as may be required to effect
such changes and all other forms and documents required to be filed with the
SEC to enable the Indenture to be so qualified in a timely manner;

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(xiii)         in the case of a Shelf Registration,
make available for inspection by a representative of the Holders of the
Registrable Securities (an “Inspector”), any Underwriter participating
in any disposition pursuant to such Shelf Registration Statement, any attorneys
and accountants designated by the Holders of Registrable Securities and any
attorneys and accountants designated by such Underwriter, at reasonable times
and in a reasonable manner, all pertinent financial and other records,
documents and properties of the Issuers and the Guarantors, and cause the
respective officers, directors and employees of the Issuers and the Guarantors
to supply all information reasonably requested by any such Inspector,
Underwriter, attorney or accountant in connection with a Shelf Registration
Statement; provided that if any such information is identified by
either of the Issuers or any Guarantor as being confidential or proprietary,
each Person receiving such information shall take such actions as are
reasonably necessary to protect the confidentiality of such information to the
extent such action is otherwise not inconsistent with, an impairment of or in
derogation of the rights and interests of any Inspector, Holder or
Underwriter);

(xiv)        in the case of a Shelf Registration, use
their reasonable best efforts to cause all Registrable Securities to be listed
on any securities exchange or any automated quotation system on which similar
securities issued or guaranteed by either of the Issuers or any Guarantor are
then listed if requested by the Majority Holders, to the extent such
Registrable Securities satisfy applicable listing requirements;

(xv)         if reasonably requested by any Holder
of Registrable Securities covered by a Shelf Registration Statement, promptly
include in a Prospectus supplement or post-effective amendment such information
with respect to such Holder as such Holder reasonably requests to be included
therein and make all required filings of such Prospectus supplement or such
post-effective amendment as soon as the Issuers have received notification of
the matters to be so included in such filing; and

(xvi)        in the case of a Shelf Registration,
enter into such customary agreements and take all such other actions in
connection therewith (including those requested by the Holders of a majority in
principal amount of the Registrable Securities being sold) in order to expedite
or facilitate the disposition of such Registrable Securities including, but not
limited to, an Underwritten Offering and in such connection, (1) to the extent
possible, make such representations and warranties to the Holders and any
Underwriters of such Registrable Securities with respect to the business of the
Issuers and their subsidiaries and the Registration Statement, Prospectus and
documents incorporated by reference or deemed incorporated by reference, if
any, in each case, in form, substance and scope as are customarily made by
issuers to underwriters in underwritten offerings and confirm the same if and
when requested, (2) obtain opinions of counsel to the Issuers and the
Guarantors (which counsel and opinions, in form, scope and substance, shall be
reasonably satisfactory to the Holders and such Underwriters and their
respective counsel) addressed to each selling Holder and Underwriter of
Registrable Securities, covering the matters customarily covered in opinions
requested in underwritten offerings, (3) obtain “comfort” letters from the
independent certified public accountants of the Issuers and the Guarantors
(and, if necessary, any other certified public accountant of any 

 12
 

subsidiary of either of
the Issuers or any Guarantor, or of any business acquired by either of the
Issuers or any Guarantor for which financial statements and financial data are
or are required to be included in the Registration Statement) addressed to each
selling Holder and Underwriter of Registrable Securities, such letters to be in
customary form and covering matters of the type customarily covered in “comfort”
letters in connection with underwritten offerings and (4) deliver such
documents and certificates as may be reasonably requested by the Holders of a
majority in principal amount of the Registrable Securities being sold or the
Underwriters, and which are customarily delivered in underwritten offerings, to
evidence the continued validity of the representations and warranties of the
Issuers and the Guarantors made pursuant to clause (1) above and to evidence
compliance with any customary conditions contained in an underwriting
agreement.

(b)           The Issuers shall not, without the
prior consent of the Initial Purchaser (such consent not to be unreasonably
withheld), make any offer relating to the Securities that would reasonably be
expected to constitute a “free writing prospectus,” as defined in Rule 405
under the Securities Act.

(c)           In the case of a Shelf Registration
Statement, the Issuers may require each Holder of Registrable Securities to
furnish to the Issuers such information regarding such Holder and the proposed
disposition by such Holder of such Registrable Securities as the Issuers and
the Guarantors may from time to time reasonably request in writing.

(d)           In the case of a Shelf Registration
Statement, each Holder of Registrable Securities agrees that, upon receipt of
any notice from the Issuers and the Guarantors of the happening of any event of
the kind described in Section 3(a)(v)(3) or 3(a)(v)(5) hereof, such Holder will
forthwith discontinue disposition of Registrable Securities pursuant to the
Shelf Registration Statement until such Holder’s receipt of the copies of the
supplemented or amended Prospectus contemplated by Section 3(a)(ix) hereof and,
if so directed by the Issuers and the Guarantors, such Holder will deliver to
the Issuers and the Guarantors all copies in its possession, other than
permanent file copies then in such Holder’s possession, of the Prospectus
covering such Registrable Securities that is current at the time of receipt of
such notice.

(e)           If the Issuers and the Guarantors
shall give any notice pursuant to Section 3(d) hereof to suspend the
disposition of Registrable Securities pursuant to a Shelf Registration Statement,
the Issuers and the Guarantors shall extend the period during which such Shelf
Registration Statement shall be maintained effective pursuant to this Agreement
by the number of days during the period from and including the date of the
giving of such notice to and including the date when the Holders of such
Registrable Securities shall have received copies of the supplemented or
amended Prospectus necessary to resume such dispositions.  Any such suspensions shall not, in the
aggregate, exceed 90 days during any 365-day period.

(f)            The Holders of Registrable
Securities covered by a Shelf Registration Statement who desire to do so may
sell such Registrable Securities in an Underwritten 

 13
 

Offering.  In any such Underwritten Offering, the
investment bank or investment banks and manager or managers (each an “Underwriter”)
that will administer the offering will be selected by the Holders of a majority
in principal amount of the Registrable Securities included in such offering.

4.             Participation of Broker-Dealers
in Exchange Offer.  (a)  The Staff has taken the position that any
broker-dealer that receives Exchange Securities for its own account in the
Exchange Offer in exchange for Securities that were acquired by such
broker-dealer as a result of market-making or other trading activities (a “Participating
Broker-Dealer”) may be deemed to be an “underwriter” within the meaning of
the Securities Act and must deliver a prospectus meeting the requirements of
the Securities Act in connection with any resale of such Exchange Securities.

The Issuers and
the Guarantors understand that it is the Staff’s position that if the
Prospectus contained in the Exchange Offer Registration Statement includes a
plan of distribution containing a statement to the above effect and the means
by which Participating Broker-Dealers may resell the Exchange Securities,
without naming the Participating Broker-Dealers or specifying the amount of
Exchange Securities owned by them, such Prospectus may be delivered by
Participating Broker-Dealers to satisfy their prospectus delivery obligation
under the Securities Act in connection with resales of Exchange Securities for
their own accounts, so long as the Prospectus otherwise meets the requirements
of the Securities Act.

(b)           In light of the above, and notwithstanding
the other provisions of this Agreement, the Issuers and the Guarantors agree to
amend or supplement the Prospectus contained in the Exchange Offer Registration
Statement for a period of up to 180 days after the last Exchange Date (as such
period may be extended pursuant to Section 3(e) of this Agreement), if requested
by the Initial Purchaser or by one or more Participating Broker-Dealers, in
order to expedite or facilitate the disposition of any Exchange Securities by
Participating Broker-Dealers consistent with the positions of the Staff recited
in Section 4(a) above.  The Issuers and
the Guarantors further agree that Participating Broker-Dealers shall be
authorized to deliver such Prospectus during such period in connection with the
resales contemplated by this Section 4.

(c)           The Initial Purchaser shall have no
liability to either of the Issuers, any Guarantor or any Holder with respect to
any request that they may make pursuant to Section 4(b) above.

5.             Indemnification and Contribution.  (a) 
Each Issuer and each Guarantor, jointly and severally, agree to
indemnify and hold harmless the Initial Purchaser and each Holder, their
respective affiliates, directors and officers and each Person, if any, who
controls the Initial Purchaser or any Holder within the meaning of Section 15
of the Securities Act or Section 20 of the Exchange Act, from and against any
and all losses, claims, damages and liabilities (including, without limitation,
legal fees and other expenses incurred in connection with any suit, action or
proceeding or any claim asserted, as such fees and expenses are incurred), that
arise out of, or are based upon, any untrue statement or alleged untrue
statement of a material fact contained in any Registration 

 14
 

Statement, any Prospectus
or any “issuer free writing prospectus,” as defined in Rule 433 under the
Securities Act (“Issuer FWP”), or any omission or alleged omission to
state therein a material fact required to be stated therein or necessary in
order to make the statements therein, in the light of the circumstances under
which they were made, not misleading, except insofar as such losses, claims,
damages or liabilities arise out of, or are based upon, any untrue statement or
omission or alleged untrue statement or omission made in reliance upon and in
conformity with any information relating to the Initial Purchaser or
information relating to any Holder furnished to the Issuers in writing by or on
behalf of the Initial Purchaser or selling Holder expressly for use
therein.  In connection with any
Underwritten Offering permitted by Section 3, the Issuers and the Guarantors,
jointly and severally, will also indemnify the Underwriters, if any, selling
brokers, dealers and similar securities industry professionals participating in
the distribution, their respective affiliates and each Person who controls such
Persons (within the meaning of the Securities Act and the Exchange Act) to the
same extent as provided above with respect to the indemnification of the
Holders, if requested in connection with any Registration Statement.

(b)           Each Holder agrees, severally and not
jointly, to indemnify and hold harmless the Issuers, the Guarantors, the
Initial Purchaser and the other selling Holders, the directors of the Issuers
and the Guarantors, each officer of the Issuers and the Guarantors who signed
the Registration Statement and each Person, if any, who controls the Issuers,
the Guarantors, the Initial Purchaser and any other selling Holder within the
meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act
to the same extent as the indemnity set forth in paragraph (a) above, but only
with respect to any losses, claims, damages or liabilities that arise out of,
or are based upon, any untrue statement or omission or alleged untrue statement
or omission made in reliance upon and in conformity with any information
relating to such Holder furnished to the Issuers in writing by such Holder
expressly for use in any Registration Statement, any Prospectus and any Issuer
FWP.

(c)           If any suit, action, proceeding
(including any governmental or regulatory investigation), claim or demand shall
be brought or asserted against any Person in respect of which indemnification
may be sought pursuant to either paragraph (a) or (b) above, such Person (the “Indemnified
Person”) shall promptly notify the Person against whom such indemnification
may be sought (the “Indemnifying Person”) in writing; provided that the failure to notify the Indemnifying Person shall not relieve
it from any liability that it may have under this Section 5 except to the
extent that it has been materially prejudiced (through the forfeiture of
substantive rights or defenses) by such failure; and provided, further,
that the failure to notify the Indemnifying Person shall not relieve it from
any liability that it may have to an Indemnified Person otherwise than under
this Section 5.  If any such proceeding
shall be brought or asserted against an Indemnified Person and it shall have
notified the Indemnifying Person thereof, the Indemnifying Person shall
retain counsel reasonably satisfactory to the Indemnified Person to represent
the Indemnified Person and any others entitled to indemnification pursuant to
this Section 5 that the Indemnifying Person may designate in such proceeding and
shall pay the fees and expenses of such counsel related to such proceeding, as
incurred.  In any such 

 15
 

proceeding, any
Indemnified Person shall have the right to retain its own counsel, but the fees
and expenses of such counsel shall be at the expense of such Indemnified Person
unless (i) the Indemnifying Person and the Indemnified Person shall have
mutually agreed to the contrary; (ii) the Indemnifying Person has failed within
a reasonable time to retain counsel reasonably satisfactory to the Indemnified
Person; (iii) the Indemnified Person shall have reasonably concluded that there
may be legal defenses available to it that are different from or in addition to
those available to the Indemnifying Person; or (iv) the named parties in any
such proceeding (including any impleaded parties) include both the Indemnifying
Person and the Indemnified Person and representation of both parties by the
same counsel would be inappropriate due to actual or potential differing
interests between them.  It is understood
and agreed that the Indemnifying Person shall not, in connection with any
proceeding or related proceeding in the same jurisdiction, be liable for the
fees and expenses of more than one separate firm (in addition to any local
counsel) for all Indemnified Persons, and that all such fees and expenses shall
be reimbursed as they are incurred.  Any
such separate firm (x) for the Initial Purchaser, its affiliates, directors and
officers and any control Persons of the Initial Purchaser shall be designated
in writing by RBC Capital Markets Corporation, (y) for any Holder, its
directors and officers and any control Persons of such Holder shall be
designated in writing by the Majority Holders and (z) in all other cases shall
be designated in writing by the Issuers. 
The Indemnifying Person shall not be liable for any settlement of any
proceeding effected without its written consent, but if settled with such
consent or if there be a final judgment for the plaintiff, the Indemnifying
Person agrees to indemnify each Indemnified Person from and against any loss or
liability by reason of such settlement or judgment.  Notwithstanding the foregoing sentence, if at
any time an Indemnified Person shall have requested that an Indemnifying Person
reimburse the Indemnified Person for fees and expenses of counsel as
contemplated by this paragraph, the Indemnifying Person shall be liable for any
settlement of any proceeding effected without its written consent if (i) such
settlement is entered into more than 30 days after receipt by the Indemnifying
Person of such request and (ii) the Indemnifying Person shall not have
reimbursed the Indemnified Person in accordance with such request prior to the
date of such settlement.  No Indemnifying
Person shall, without the written consent of the Indemnified Person, effect any
settlement of any pending or threatened proceeding in respect of which any
Indemnified Person is or could have been a party and indemnification could have
been sought hereunder by such Indemnified Person, unless such settlement (A)
includes an unconditional release of such Indemnified Person, in form and
substance reasonably satisfactory to such Indemnified Person, from all
liability on claims that are the subject matter of such proceeding and (B) does
not include any statement as to or any admission of fault, culpability or a
failure to act by or on behalf of any Indemnified Person.

(d)           If the indemnification provided for
in paragraphs (a) and (b) above is unavailable to an Indemnified Person or
insufficient in respect of any losses, claims, damages or liabilities referred
to therein, then each Indemnifying Person under such paragraph, in lieu of
indemnifying such Indemnified Person thereunder, shall contribute to the amount
paid or payable by such Indemnified Person as a result of such losses, claims,
damages or liabilities (i) in such proportion as is appropriate to reflect the
relative benefits received by the Issuers and the Guarantors from the offering
of the Securities and 

 16
 

the Exchange Securities,
on the one hand, and by the Holders from receiving Securities or Exchange
Securities registered under the Securities Act, on the other hand, or (ii) if
the allocation provided by clause (i) is not permitted by applicable law, in
such proportion as is appropriate to reflect not only the relative benefits
referred to in clause (i) but also the relative fault of the Issuers and the
Guarantors on the one hand and the Holders on the other in connection with the
statements or omissions that resulted in such losses, claims, damages or liabilities,
as well as any other relevant equitable considerations.  The relative fault of the Issuers and the
Guarantors on the one hand and the Holders on the other shall be determined by
reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission or alleged omission to state a
material fact relates to information supplied by the Issuers and the Guarantors
or by the Holders, and the parties’ relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.

(e)           The Issuers, the Guarantors and the
Holders agree that it would not be just and equitable if contribution pursuant
to this Section 5 were determined by pro  rata allocation (even if
the Holders were treated as one entity for such purpose) or by any other method
of allocation that does not take account of the equitable considerations
referred to in paragraph (d) above.  The
amount paid or payable by an Indemnified Person as a result of the losses, claims,
damages and liabilities referred to in paragraph (d) above shall be deemed to
include, subject to the limitations set forth above, any legal or other
expenses incurred by such Indemnified Person in connection with any such action
or claim.  Notwithstanding the provisions
of this Section 5, in no event shall a Holder be required to contribute any
amount in excess of the amount by which the
total price at which the Securities or Exchange Securities sold by such Holder exceeds
the amount of any damages that such Holder has otherwise been required to pay
by reason of such untrue or alleged untrue statement or omission or alleged
omission.  No Person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
shall be entitled to contribution from any Person who was not guilty of such
fraudulent misrepresentation.

(f)            The remedies provided for in this
Section 5 are not exclusive and shall not limit any rights or remedies that may
otherwise be available to any Indemnified Person at law or in equity.

(g)           The indemnity and contribution
provisions contained in this Section 5 shall remain operative and in full force
and effect regardless of (i) any termination of this Agreement, (ii) any
investigation made by or on behalf of the Initial Purchaser or any Holder or
any Person controlling the Initial Purchaser or any Holder, or by or on behalf
of the Issuers or the Guarantors or the officers or directors of or any Person
controlling the Issuers or the Guarantors, (iii) acceptance of any of the
Exchange Securities and (iv) any sale of Registrable Securities pursuant to a
Shelf Registration Statement.

 17
 

6.             General.

(a)           No Inconsistent
Agreements.   The Issuers and the Guarantors represent,
warrant and agree that (i) the rights granted to the Holders hereunder do not
in any way conflict with and are not inconsistent with the rights granted to
the holders of any other outstanding securities issued or guaranteed by either
of the Issuers or any Guarantor under any other agreement and (ii) neither the
Issuers nor any Guarantor has entered into, or on or after the date of this
Agreement will enter into, any agreement that is inconsistent with the rights
granted to the Holders of Registrable Securities in this Agreement or otherwise
conflicts with the provisions hereof.

(b)           Amendments and
Waivers.   The provisions of this Agreement, including
the provisions of this sentence, may not be amended, modified or supplemented,
and waivers or consents to departures from the provisions hereof may not be
given unless the Issuers and the Guarantors have obtained the written consent
of Holders of at least a majority in aggregate principal amount of the
outstanding Registrable Securities affected by such amendment, modification,
supplement, waiver or consent; provided that no amendment, modification,
supplement, waiver or consent to any departure from the provisions of Section 5
hereof shall be effective as against any Holder of Registrable Securities
unless consented to in writing by such Holder. 
Any amendments, modifications, supplements, waivers or consents pursuant
to this Section 6(b) shall be by a writing executed by each of the parties
hereto.

(c)           Notices.  All notices and other communications provided
for or permitted hereunder shall be made in writing by hand-delivery,
registered first-class mail, telecopier, or any courier guaranteeing overnight
delivery (i) if to a Holder, at the most current address given by such Holder
to the Issuers by means of a notice given in accordance with the provisions of
this Section 6(c), which address initially is, with respect to the Initial
Purchaser, the address set forth in the Purchase Agreement; (ii) if to the
Issuers and the Guarantors, initially at the Issuers’ address set forth in the
Purchase Agreement and thereafter at such other address, notice of which is
given in accordance with the provisions of this Section 6(c); and (iii) to such
other persons at their respective addresses as provided in the Purchase
Agreement and thereafter at such other address, notice of which is given in
accordance with the provisions of this Section 6(c).  All such notices and communications shall be
deemed to have been duly given: at the time delivered by hand, if personally
delivered; five Business Days after being deposited in the mail, postage
prepaid, if mailed; when receipt is acknowledged, if telecopied; and on the
next Business Day if timely delivered to an air courier guaranteeing overnight
delivery.  Copies of all such notices,
demands or other communications shall be concurrently delivered by the Person
giving the same to the Trustee, at the address specified in the Indenture.

(d)           Successors and Assigns. This
Agreement shall inure to the benefit of and be binding upon the successors,
assigns and transferees of each of the parties, including, without limitation
and without the need for an express assignment, subsequent Holders; provided
that nothing herein shall be deemed to permit any assignment, transfer or other
disposition of Registrable Securities in violation of the terms of the Purchase
Agreement or the Indenture.  If any
transferee of any Holder shall acquire Registrable Securities in 

 18
 

any manner, whether by
operation of law or otherwise, such Registrable Securities shall be held
subject to all the terms of this Agreement, and by taking and holding such
Registrable Securities such Person shall be conclusively deemed to have agreed
to be bound by and to perform all of the terms and provisions of this Agreement
and such Person shall be entitled to receive the benefits hereof.  The Initial Purchaser (in its capacity as
Initial Purchaser) shall have no liability or obligation to the Issuers or the
Guarantors with respect to any failure by a Holder to comply with, or any
breach by any Holder of, any of the obligations of such Holder under this
Agreement.

(e)           Third Party Beneficiaries.  Each Holder shall be a third party
beneficiary to the agreements made between the Issuers and the Guarantors, on
the one hand, and the Initial Purchaser, on the other hand, and shall have the
right to enforce such agreements directly to the extent it deems such
enforcement necessary or advisable to protect its rights or the rights of other
Holders hereunder.

(f)            Counterparts.
This Agreement may be executed in any number of counterparts and by the parties
hereto in separate counterparts, each of which when so executed shall be deemed
to be an original and all of which taken together shall constitute one and the
same agreement.

(g)           Headings.  The headings in this Agreement are
for convenience of reference only, are not a part of this Agreement and shall
not limit or otherwise affect the meaning hereof.

(h)           Governing Law.  This Agreement shall be governed
by and construed in accordance with the laws of the State of New York.

(j)            Miscellaneous.  This Agreement
contains the entire agreement between the parties relating to the subject
matter hereof and supersedes all oral statements and prior writings with
respect thereto.  If any term, provision,
covenant or restriction contained in this Agreement is held by a court of
competent jurisdiction to be invalid, void or unenforceable or against public
policy, the remainder of the terms, provisions, covenants and restrictions
contained herein shall remain in full force and effect and shall in no way be
affected, impaired or invalidated.  The
Issuers, the Guarantors and the Initial Purchaser shall endeavor in good faith
negotiations to replace the invalid, void or unenforceable provisions with
valid provisions the economic effect of which comes as close as possible
to that of the invalid, void or unenforceable provisions.

 19
 

IN WITNESS
WHEREOF, the parties have executed this Agreement as of the date first written
above.

	
  Issuers:

  	
   

  
	
   

  	
   

  
	
  MARKWEST ENERGY
  PARTNERS, L.P.

  	
   

  
	
   

  	
   

  
	
  By:

  	
  MARKWEST ENERGY GP, L.L.C., its general partner

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
     /s/
  ANDREW L. SCHROEDER

  	
   

  
	
   

  	
  Name:

  	
  Andrew L.
  Schroeder

  	
   

  
	
   

  	
  Title:

  	
  Vice President
  and Treasurer

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  MARKWEST ENERGY
  FINANCE CORPORATION

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
     /s/
  ANDREW L. SCHROEDER

  	
   

  
	
   

  	
  Name:

  	
  Andrew L.
  Schroeder

  	
   

  
	
   

  	
  Title:

  	
  Vice President
  and Treasurer

  	
   

  
								

 

 20
 

 

	
  

  	
  Guarantors:

  
	
   

  	
   

  
	
   

  	
  MARKWEST ENERGY OPERATING
  COMPANY,

  L.L.C.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS,

  
	
   

  	
   

  	
   

  	
  L.P., its  Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C., its 

  
	
   

  	
   

  	
   

  	
  General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  BASIN PIPELINE L.L.C.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating Company, 

  
	
   

  	
   

  	
   

  	
  L.L.C., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C., its 

  
	
   

  	
   

  	
   

  	
  General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 21
 

 

	
  

  	
  WEST SHORE PROCESSING COMPANY, L.L.C.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating Company,

  
	
   

  	
   

  	
   

  	
  L.L.C., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS,

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  MARKWEST ENERGY APPALACHIA, L.L.C.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating Company,

  
	
   

  	
   

  	
   

  	
  L.L.C., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS,

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 22
 

 

	
  

  	
  MARKWEST TEXAS GP, L.L.C.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating Company, 

  
	
   

  	
   

  	
   

  	
  L.L.C., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  MW TEXAS LIMITED, L.L.C.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing

  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L.
  SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 23
 

 

	
  

  	
  MARKWEST MICHIGAN PIPELINE COMPANY,

  L.L.C.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  MARKWEST WESTERN OKLAHOMA
  GAS

  COMPANY, L.L.C.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing

  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L.
  SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 24
 

 

	
  

  	
  MARKWEST NEW MEXICO, L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS,

  
	
   

  	
   

  	
   

  	
   L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  MARKWEST PINNACLE L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L.
  SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 25
 

 

	
  

  	
  MARKWEST PNG UTILITY, L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  MARKWEST TEXAS PNG
  UTILITY, L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating 

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L.
  SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 26
 

 

	
  

  	
  MARKWEST BLACKHAWK, L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  MARKWEST POWER TEX L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L.
  SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 27
 

 

	
  

  	
  MARKWEST ENERGY EAST TEXAS GAS 

  COMPANY, L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  MARKWEST PIPELINE COMPANY,
  L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating  

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L.
  SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 28
 

 

	
  

  	
  MARKWEST JAVELINA HOLDING COMPANY, L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  MARKWEST JAVELINA PIPELINE
  HOLDING, L.P.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating 

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  
	
   

  	
   

  	
   

  	
  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C., 

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L.
  SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 29
 

 

	
  

  	
  MARKWEST JAVELINA COMPANY

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST JAVELINA HOLDING 

  
	
   

  	
   

  	
   

  	
  COMPANY, L.P. and MARKWEST 

  JAVELINA PIPELINE COMPANY, 

  its owners

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  their general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating 

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing

  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 30
 

 

	
  

  	
  MARKWEST JAVELINA PIPELINE COMPANY

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST JAVELINA HOLDING 

  
	
   

  	
   

  	
   

  	
  COMPANY, L.P. and MARKWEST 

  JAVELINA PIPELINE COMPANY, 

  its owners

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST TEXAS GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  their general partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MarkWest Energy Operating 

  
	
   

  	
   

  	
   

  	
  Company, L.L.C., its Managing 

  Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY PARTNERS, 

  
	
   

  	
   

  	
   

  	
  L.P., its Managing Member

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  MARKWEST ENERGY GP, L.L.C.,

  
	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/  ANDREW L. SCHROEDER

  
	
   

  	
  Name:

  	
  Andrew L. Schroeder

  
	
   

  	
  Title:

  	
  Vice President and Treasurer

  

 

 31
 

Confirmed and accepted as
of the date first above written:

	
  RBC CAPITAL MARKETS
  CORPORATION

  	
   

  
	
   

  	
   

  
	
   

  	
   

  
	
  By

  	
  /s/ STEVE BENFIELD

  	
   

  	
   

  
	
   

  	
  Name:

  	
  Steve Benfield

  	
   

  
	
   

  	
  Title:

  	
  Managing Director

  	
   

  
					

 

 32
 

Schedule 1

Guarantors

MarkWest
Energy Operating Company, L.L.C.

Basin
Pipeline L.L.C.

West
Shore Processing Company, L.L.C.

MarkWest
Energy Appalachia, L.L.C.

MarkWest
Texas GP, L.L.C.

MW
Texas Limited, L.L.C.

MarkWest
Michigan Pipeline Company, L.L.C.

MarkWest
Western Oklahoma Gas Company, L.L.C.

MarkWest
Power Tex L.P.

MarkWest
Pinnacle L.P.

MarkWest
PNG Utility, L.P.

MarkWest
Texas PNG Utility, L.P.

MarkWest
Blackhawk, L.P.

MarkWest
New Mexico, L.P.

MarkWest
Energy East Texas Gas Company, L.P.

MarkWest
Pipeline Company, L.P.

MarkWest
Javelina Company

MarkWest
Javelina Holding Company, L.P.

MarkWest
Javelina Pipeline Company

MarkWest
Javelina Pipeline Holding, L.P.

 33Exhibit 10.1

[Execution Copy]

SEPARATION AGREEMENT AND GENERAL RELEASE

David S. Johnson (“Johnson”)
has been employed by Kraft Foods Global, Inc. (“Kraft”) as President, North
America Commercial in Northfield, Illinois. Johnson’s employment relationship
with Kraft has ended and Kraft has offered Johnson benefits as set forth in
this Agreement, certain of which benefits are greater than what Johnson is
entitled to receive, and Johnson has decided to accept Kraft’s offer. Therefore,
Johnson and Kraft both agree and promise as follows:

1.             Johnson’s last day of active work
at Kraft was September 12, 2006; however, Johnson will be paid his regular
salary by Kraft through October 31, 2006 (“Termination Date”). Johnson will
thereafter not receive any further salary payments from Kraft until May 1,
2007. After that date Johnson will be paid the following Separation Payments by
Kraft: (a) by May 10, 2007 a lump sum payment, less applicable withholding,
equal to six (6) months of Johnson’s base salary in effect on the Termination
Date; and (b) twelve (12) months of his salary to be paid on a salary
continuation basis, at his bi-weekly base salary in effect on the Termination
Date, from May 1, 2007 through April 30, 2008 (the “Salary Continuation Period”).
Johnson will be eligible to receive Kraft medical, dental, life, long-term
disability and personal accident insurance coverage pursuant to the terms of
these Kraft benefit plans as if he were an employee until April 30, 2008. While
he is on Salary Continuation Johnson’s cost for medical and dental insurance
coverage will be deducted from his Salary Continuation payments; and, for the
period from November 1, 2006 through April 30, 2007, Johnson will pay Kraft the
applicable cost in a single lump sum within thirty (30) days after receipt of
an invoice from Kraft. Johnson will be credited with pension service under
Kraft’s Retirement Plan (both qualified and non-qualified) from November 1,
2006 through April 30, 2008. Johnson will not be eligible to receive Kraft
short-term disability insurance coverage or business travel accident coverage,
or be eligible to make 401(k) Plan contributions or receive Kraft’s matching
contribution under the 401(k) Plan after the Termination Date.

2.             Provided that Johnson complies with
Sections 7, 10, 11 and 12 of this Agreement, Johnson will receive a payment in
respect of his 2006 annual incentive award under the Kraft Management Incentive
Plan (“MIP”) to be pro-rated for the period from January 1, 2006 through the
Termination Date and paid on the basis of Johnson’s individual target
percentage and the actual business unit rating for Kraft for full fiscal 2006,
as determined by the Compensation Committee of Kraft’s Board of Directors (the “Committee”).
This payment, less required deductions, will be made at such time as MIP
payments for the 2006 performance period are made to Kraft’s senior executives.
In addition, Johnson will, provided that he complies with Sections 7, 10, 11
and 12 of this Agreement, receive a payment of his 2004-2006 Long-Term
Incentive Plan (“LTIP”) award to be pro-rated from January 1, 2004 through the
Termination Date and paid on the basis of Johnson’s individual target
percentage and the actual Kraft LTIP rating, as determined by the Committee. This
payment, less required deductions, will be made at

 

such time as LTIP payments for the 2004-2006
performance period are made to Kraft’s senior executives.

3.             Johnson will be eligible for
continued financial counseling in accordance with current practice through the
end of the Salary Continuation Period. 
In addition, Johnson will be eligible to continue participating in the
Kraft executive car policy through the Salary Continuation Period.  Following the Salary Continuation Period,
Johnson will have the choice of purchasing the car based on 100% of the
wholesale value plus all applicable taxes, license fees and any administrative
fees charged by the leasing company, or returning the car to Kraft’s Northfield
location or another mutually agreed upon location.  During the Salary Continuation Period, Kraft
will continue to be responsible for paying all normal repair, and normal
maintenance.

4.             Johnson will be entitled to
exercise any vested stock options that he holds in Altria Group, Inc. (formerly
Philip Morris Companies Inc.) and Kraft Foods Inc. stock pursuant to the terms
of the applicable option grant.  His
separation from employment will be treated for stock option exercise purposes
as an involuntary termination without cause and he will have 12 months from his
Termination Date to exercise any unexercised options.  Johnson will forfeit any right, title and
interest to his unvested 2004, 2005 and 2006 Kraft restricted stock awards.

5.             Kraft
will pay Johnson, in a single lump sum less required deductions,
$1,877,000.  This payment will be made to
Johnson by October 31, 2006.

6.             If Johnson were to die prior to his
receipt of the payments due him pursuant to Sections 1, 2 and 5 above, Kraft
agrees to pay Johnson’s surviving spouse (or estate if no surviving spouse) any
Salary Continuation payments not yet received under paragraph 1, the payments
provided for in Section 2, and the lump sum payment provided for in Section 5, provided
that if the amount of the payments described in Section 2 have not yet been
determined at the time of Johnson’s death, such payments will be made at such
time as their amount has been determined.

7.             As consideration for Kraft’s
payment to Johnson of the monies provided for in Sections 1, 2 and 5, Johnson
agrees that he will not engage in Prohibited Conduct from the date of this
Agreement through October 31, 2007. 
Prohibited Conduct will be: (1) working for, or providing services,
directly or indirectly (whether as an employee, consultant, officer, director,
partner, joint venturer, manager, member, principal, agent, or independent
contractor, individually, in concert with others, or in any other manner), to
any of the companies listed below, or of an entity that has a controlling
equity interest or management control of any such company, without the written consent
of Kraft’s Executive Vice President Global Human Resources, or designee, such
consent to be provided by Kraft in its sole and absolute discretion; or (2)
soliciting, directly or indirectly, any employee of Kraft to leave Kraft and to
work for any other entity, whether as an employee, independent contractor or in
any other capacity.

 2
 

 

 

The companies are:  Cadbury Schweppes plc, Campbell Soup Company,
The Coca-Cola Company, ConAgra Foods, Inc., General Mills, Inc., Groupe Danone,
H.J. Heinz Company, Hershey Foods Corporation, Kellogg Company, Nestlé S.A.,
PepsiCo, Inc., The Procter & Gamble Company, Sara Lee Corporation, and
Unilever N.V., or any subsidiaries, affiliates or subsequent parent or merger
partner if any of these companies are acquired or merge.  For purposes of this Agreement, “affiliate”
of a specified person or entity means a person or entity that directly or
indirectly controls, is controlled by, or is under common control with, the
person or entity specified.

Should Johnson engage in
Prohibited Conduct at any time prior to October 31, 2007 he will be obligated
to pay back to Kraft all
payments received pursuant to this Agreement and Kraft will have no obligation
to pay Johnson any payments that may be remaining due under this Agreement. This
will be in addition to any other remedy that Kraft may have in respect of such
Prohibited Conduct.  Kraft and Johnson
acknowledge and agree that Kraft will or would suffer irreparable injury in the
event of a breach or violation or threatened breach or violation of the
provisions set forth in Sections 5, 8, 9 and 10 and agree that in the event of
an actual or threatened breach or violation of such provisions Kraft will be
awarded injunctive relief in the federal or state courts located in Illinois to
prohibit any such violation or breach or threatened violation or breach,
without necessity of posting any bond or security, and that such right to
injunctive relief will be in addition to any other rights available under this
Agreement.

8.             Kraft will provide executive outplacement services to
Johnson, upon his request and will reimburse Johnson for his reasonable
professional fees incurred by him in connection with the negotiation and
preparation of this Agreement, provided, however, that Kraft’s obligation to pay
for outplacement services and professional fees, combined, will not exceed a
maximum of $50,000.

9.             Johnson
agrees to return all company property in his possession, including documents,
manuals, handbooks, notes, keys and any other articles he has used in the
course of his employment, no later than his Termination Date.

10.           Johnson
acknowledges that during the course of his employment with Kraft, he was
entrusted with certain marketing, financial, product, manufacturing, technical
and other proprietary information and material which are the property of
Kraft.  Johnson agrees that, from the
date of this Agreement and following his Termination Date, he will not
communicate or disclose to any third party, or use for his own account, without
the written consent of Kraft, any of the aforementioned information or
material, except as required by legal process or unless and until such
information or material becomes generally available to the public through no
fault of Johnson.  Nothing herein shall
preclude Johnson from using his general knowledge and expertise to fulfill job
responsibilities with a new employer. 
Nothing in this Section 10 will prevent Johnson from making any
disclosure required by law or as a result of a court, arbitration,
administrative or similar proceeding (provided Johnson will request
confidential treatment of any such information and provide Kraft with
reasonable prior notice of the disclosure.)

 3
 

 

 

11.           Johnson
agrees to keep the terms and substance of this Agreement confidential, and that
he will not disclose the terms of this Agreement or matters out of which it
arises to anyone, except his immediate family, his financial advisors, his
attorneys, or as may be required by law; provided, however, that Johnson may
disclose the terms of the non-compete/non-solicitation provisions of Section 6
and the confidentiality provisions of Section 8 to any prospective employer.

12.           Johnson
agrees that, in discussing his relationship with Kraft and its affiliated and
parent companies and their business and affairs, he will not disparage,
discredit or otherwise treat in a detrimental manner Kraft, its affiliated and
parent companies or their officers, directors and employees.  Kraft agrees that, in discussing its relationship
with Johnson, it will not disparage or discredit him or otherwise treat him in
a detrimental way.  Nothing in this
Section 12 will prevent any person from making truthful statements to the
extent necessary with respect to any proceeding relating to this Agreement or
as required by law or as a result of a court, arbitration, administrative or
legislative proceeding, provided each party will provide reasonable notice to
the other of any statement required by law or any such proceeding.

13.           Johnson
agrees to fully cooperate with Kraft and its affiliated and parent companies in
the defense of any matter in which he was involved during his employment and to
make himself reasonably available as required by Kraft or its affiliated and
parent companies or their counsel, subject to Johnson’s other commitments.  In the event such a matter arises, Kraft or
its affiliated or parent companies will be solely responsible for all costs and
fees which may be incurred and will continue to indemnify Johnson to the fullest
extent permitted by law for all actions taken by him as an employee and/or
officer of Kraft.  If time incurred by
Johnson on Kraft’s behalf becomes substantial, Kraft shall pay Johnson a fee
for his time and effort, such fee to be mutually determined by Kraft and
Johnson.

14.           In
the event either Johnson or Kraft contests the interpretation or application of
any of the terms of this Agreement, the complaining party shall notify the
other in writing of the provision that is being contested.  If the parties cannot satisfactorily resolve
the dispute within thirty (30) days, the matter will be submitted to
arbitration.  An arbitrator will be
chosen pursuant to the American Arbitration Association’s (“AAA”) National
Rules for the Resolution of Employment Disputes from a panel submitted by the
AAA Chicago, IL office and the hearing shall be held at a mutually agreeable
location in the Chicago metropolitan area. 
The arbitrator’s fees and expenses and filing fees shall be borne
equally by Johnson and Kraft.  The
arbitrator shall issue a written award which shall be final and binding upon
the parties.

15.           Johnson
is aware of his legal rights concerning his employment with Kraft.  In consideration for the benefits being
provided to Johnson hereunder, Johnson (for himself, his heirs, legal
representatives and assigns) hereby waives, and generally releases Kraft, its
affiliated companies and their officers, directors, agents, and employees from,
and agrees not to sue them for any claims or causes of action existing on the
date of this Agreement arising out of his employment relationship with Kraft or
the separation from that employment. 
This includes, but is not limited to, all claims under Title VII of

 4
 

 

 

the Civil Rights Act of 1964, the Age Discrimination
in Employment Act, the Older Workers Benefit Protection Act, the Employee
Retirement Income Security Act, or any other federal, state or local law
dealing with employment discrimination, and claims for breach of contract and
wrongful discharge; provided, however, that this release shall not waive any
rights or claims that arise after the date of this Agreement or that Johnson
may have to benefits under this Agreement, under any applicable Kraft employee
benefit plan, program or arrangement, or with respect to indemnification and/or
insurance protection for all actions taken by Johnson while an employee,
officer and/or director of Kraft or its affiliates or related enterprises.  In consideration for the above release,
Kraft, on behalf of itself and its affiliated companies, and their officers,
directors, agents and employees, hereby waives, and generally releases Johnson
from, and agrees not to sue him for any claims or causes of action existing on
the date of this Agreement arising out of his employment relationship with
Kraft or the separation from employment.

16.           Johnson
is a participant in various plans operated by Kraft that may or do provide
non-qualified deferred compensation.  If
any compensation or benefits provided for by this Agreement or such plans may
result in the application of Section 409A of the Code, Kraft will, in agreement
with Johnson modify the Agreement or such plans in the least restrictive manner
necessary in order, where applicable, (i) to exclude such compensation from the
definition of “deferred compensation” within the meaning of said Section 409A,
or (ii) to comply with the provisions of said Section 409A, other applicable
provisions of the Code and/or any rules, regulations or other regulatory
guidance issued under such statutory provisions and to make such modification,
in each case, without any diminution in the value of the payments to be paid or
provided to Johnson pursuant to Sections 1, 2, 3, 4, 5 and 8 of this Agreement
or such plans. To the extent required in order to comply with Section 409A of
the Code, amounts or benefits to be paid or provided to Johnson pursuant to
this Agreement will be delayed to the first business day on which such amounts
and benefits may be paid to Johnson in compliance with said Section 409A.

17.           Johnson
will continue to be entitled to indemnification in accordance with applicable
laws, the governing corporate documents of Kraft or its affiliates, or
applicable insurance policies, and will continue to be covered by directors’
and officers’ insurance maintained by Kraft or its affiliates, with respect to
any liability Johnson incurs or incurred as a result of his having served as an
employee, officer and/or director of Kraft or its affiliates or any related
enterprises.

18.           Johnson
is not obligated to seek other employment or to take any action to mitigate any
amounts payable under this Agreement, which amounts will not be subject to
offset.  This Agreement will be binding
upon and inure to the benefit of the parties and their respective successors
and Kraft shall require any successor to assume and agree to perform this
Agreement.  This Agreement may not be
amended except by written agreement of Johnson and Kraft.  This Agreement may be executed in
counterparts, each of which will be deemed original but all of which one and
same Agreement.  Signatures may be
delivered by facsimile or in pdf format.

 5
 

 

 

19.           By
signing below Johnson acknowledges that he has thoroughly read this
Agreement.  He also acknowledges that he
has been advised to consult an attorney prior to executing this Agreement and
that he has 21 days to review this Agreement before signing it, and an
additional 7 days after signing it to revoke it.  In addition, Johnson agrees that he has full
understanding and knowledge of the terms and conditions of this Agreement, and
that he understands that these terms will be final and binding upon Johnson and
upon Kraft 7 days from the execution of this Agreement.

 

	
  /s/ DAVID S. JOHNSON

  	
   

  	
  Date:

  	
  10/18/06

  	
   

  
	
  DAVID S. JOHNSON

  	
   

  	
   

  	
   

  	
   

  

 

The
undersigned hereby certifies that David S. Johnson appeared before me and
signed this document and verified that he signed this Agreement voluntarily.

 

	
  /s/ CATHERINE MILLER

  	
   

  	
  Date:

  	
  10/18/06

  	
   

  
	
  Notary Public

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
  Official Seal

  Catherine Miller

  Notary Public State of Illinois

  My Commission Expires 11/18/07

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
  My Commission
  Expires:

  	
   

  	
   

  	
   

  	
   

  
	
  11/18/07

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
  ACCEPTED FOR KRAFT FOODS GLOBAL, INC.

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
  By:

  	
  /s/ KAREN J. MAY

  	
   

  	
   

  	
   

  	
   

  
	
  Title:

  	
  EVP Global Human
  Resources

  	
   

  	
   

  	
   

  	
   

  
	
  Date:

  	
  10/19/06

  	
   

  	
   

  	
   

  	
   

  	
   

  
							

 

 6

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