Document:

Exhibit
10.1

	
              

  	
  RED ROBIN INTERNATIONAL, INC.

  
	
   

  	
  6312 Fiddler’s Green Circle

  
	
   

  	
  Suite 200 North

  
	
   

  	
  Greenwood Village, CO 80111

  
	
   

  	
  303-846-6000

  

 

February 19, 2008

 

Michael E. Woods

6440 East Berry Avenue

Englewood, CO 80111

 

Re:          Employment
and Consulting Agreement

 

Dear Mike:

 

                Red
Robin International, Inc. (“Red Robin” or “the Company” or “we” or “us”)
wants to engage you under the terms set forth herein, as a consultant.

 

                You
will continue in your role of Senior Vice President and Chief Knowledge Officer
through April 2, 2008.  Commencing April 3,
2008, through October 3, 2009 (the “Consulting Period”), you will be
engaged to consult with Red Robin on an as needed basis, subject to either
party’s right to cancel the consulting agreement at any time by written notice
to the other. You agree that during the Consulting Period you will be
reasonably available to provide consulting services to the Company, and will
notify the Company in advance of any extended absences or periods when you will
be unavailable.  You also agree that the
Company may terminate this agreement for cause, if, in the Company’s exercise
of its reasonable discretion, your unavailability has reasonably interfered
with the Company’s ability to request and utilize services from you.

 

                For
your services as an employee in 2008, Red Robin will continue to pay you
monthly in arrears at your current 2007 base salary rate of $300,000 through April 2,
2008. You will not earn nor be eligible for any awards or grants under any of
the Company’s bonus, equity or other award plans for services rendered in 2008.
We will continue to provide you with continuation of current health and welfare
benefits generally available to employees until April 2, 2008.

 

                For
your services as a consultant from April 3, 2008 to October 3, 2009,
Red Robin will pay you a consulting fee of $300.00 per hour for the hours
worked for us with no minimum monthly amount. You will need to submit an
invoice showing the hours you work for us each month. We will reimburse you for
reasonable travel expenses and similar out of pocket expenses that you incur in
performing your consulting services. When you are providing consulting services
to the Company, we will provide you with an office and standard office
equipment at no charge to you.

 

                As additional
consideration for your consulting services, the Compensation Committee of the
Board, acting as the Stock Plan Administrator for all of Red Robin’s stock
option plans, will take such actions as may be appropriate to cause the stock
options that the Company has awarded to you as an employee of the Company to
continue to vest at the rate and on the terms stated in the applicable stock
option agreement, so long as you continue providing services to the Company
under the terms of the consulting agreement and allow you to exercise all
options that have vested  

 

 

during the term of your employment or that vest during
the term of the consulting arrangement, in accordance with the options’ terms.

 

                To
the extent that the Company reasonably believes or has been advised that paying
you the consulting fees or allowing your stock options to continue to vest or
allowing you to exercise your stock options after the termination of your
employment will, or would likely, result in adverse tax consequences to you or
to the Company or both, provided both parties mutually agree, the Company may
restructure this agreement, including the Company’s obligation to pay you the
consulting fees or the vesting of your stock options or conditions upon which
you may exercise said stock options (as to form and/or timing, but not as to
amount) in a manner designed to eliminate or, if not practical, mitigate such
adverse tax consequences.

 

                If
in the course of your services as a consultant hereunder you have access to any
confidential or proprietary information of the Company, then you must treat
that information as confidential in the same manner as you would be obligated
to do now under our Code of Ethics with respect to the provisions of the Code
of Ethics under the headings Confidentiality
and Red Robin’s Books, Records and Other Property,
which shall continue to apply to you during the term hereof.  During the continuation of your term as an
employee, you shall remain subject to all employee policies.

 

                Any
writings, reports, plans, recipes, procedures, manuals, or other written works,
and any drawings, sketches, pictures, or diagrams you prepare in performing
your work for us will be deemed “Works Made
for Hire,” and we will own the copyright and all other rights to the
Work Made for Hire provided that Works Made for Hire will not include
materials that are a derivative work of a previously completed work in which
Woods holds the copyright or a license to use the materials.

 

                It
is understood your last day as an employee will be April 2, 2008 and that,
per the Employment Agreement dated January 7, 1997 between Red Robin
International, Inc. and Mike Woods beginning April 3, 2008, RRI will
pay your current salary of $300,000 monthly in accordance with the terms
thereof. With the exception of such terms this Agreement constitutes
the entire agreement between or among us and supersedes any prior
understandings, agreements or representations by or among us, written or oral,
which may have related in any way to the subject matter of the Agreement.

 

                Mike,
if this is acceptable on the terms stated, please sign this letter in the space
provided below.

 

***

 

(Remainder of Page deliberately
left blank)

 

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Very truly yours,

 

	
  /s/ Katherine L. Scherping

  
	
  Katherine L. Scherping

  
	
  Vice President

  

 

ACCEPTANCE

 

                I
agree to the employment and consulting terms and conditions stated above.

 

	
  /s/ Michael E. Woods

  
	
  Michael E. Woods

  
	
  February 19, 2008

  

 

3Exhibit 10.1

 

REGISTRATION
RIGHTS AGREEMENT

 

THIS REGISTRATION RIGHTS AGREEMENT (the “Agreement”)
is entered into as of the 21st day of February, 2008, by and among MARKWEST ENERGY PARTNERS, L.P., a Delaware limited
partnership (the “Partnership”), and each of JOHN M. FOX (“Fox”)  and MWHC
HOLDING, INC., a Colorado corporation (each, a “Holder”
and collectively, the “Holders”).

 

RECITALS

 

WHEREAS, MarkWest Hydrocarbon, Inc. (“Hydrocarbon”),
the Partnership and WMEP, L.L.C. (“Merger Sub”)  are parties to an Agreement and
Plan of Redemption and Merger, dated as of September 5, 2007 (the “Merger Agreement”), pursuant to
which, (i) Hydrocarbon will redeem a portion of its outstanding shares of
common stock, par value $0.01 per share, of Hydrocarbon (the “Common Stock”) and then (ii) Merger
Sub will merge (the “Merger”)
with and into Hydrocarbon, with Hydrocarbon surviving, such that following the
Redemption and Merger, Hydrocarbon will be a direct, wholly owned subsidiary of
Energy Partners;

 

WHEREAS, the Partnership has conditioned its execution of the
Merger Agreement upon the execution and delivery by the Holders of that certain
Voting Agreement by and among the Partnership and the Holders dated as of  September 5, 2007 (the “Voting Agreement”);

 

WHEREAS, in connection with the Merger, it is anticipated that
the Holders will receive Common Units;

 

WHEREAS, Fox is also a “Holder” under a Class B
Membership Interest Contribution Agreement, dated September 5, 2007 by and
among the Partnership and those parties designated as “Holders” therein (the “Class B Agreement”), pursuant
to which, among other things, the Partnership will acquire (the “Class B Acquisition”) the Class B
membership interests in MarkWest Energy GP, L.L.C., a Delaware limited
liability company (the “General Partner”),
of Fox for a combination of cash and Common Units; and

 

WHEREAS, the transferability of the Common Units received in
connection with the Merger may be limited by the provisions of Rule 145(c) under
the Securities Act (as defined below) and if the Holders are affiliates of the
Partnership and the transferability of the Common Units received in the Class B
Acquisition may be limited by the provisions of Rule 144 under the
Securities Act, and the Partnership, in consideration of the execution and
delivery by the Holders of the Voting Agreement and the Class B Agreement,
has agreed to provide the Holders with the registration rights set forth
herein.

 

NOW, THEREFORE, in consideration of these premises and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

 

 

SECTION 1.                            DEFINITIONS.

 

1.1          Definitions.  As used in this Agreement the following
terms shall have the following respective meanings:

 

(a)           “Amended and Restated
Partnership Agreement” means the Third Amended and Restated Partnership
Agreement of the Partnership.

 

(b)           “Business Day” means any day which is not a Saturday,
Sunday or other day on which banks are authorized or required to be closed in
the City of New York.

 

(c)           “Common Units”
means the common units representing limited partner interests of the
Partnership having the rights and obligations specified with respect to Common
Units in the Amended and Restated Partnership Agreement.

 

(d)           “Exchange Act”  means the Securities Exchange Act of
1934, as amended.

 

(e)           “Managing Underwriter” means, with respect to
any Underwritten Offering, the book-running lead manager of such Underwritten
Offering.

 

(f)            “Prior Holders” means Tortoise MWEP, L.P., a
Kansas limited partnership, each investor party listed on Schedule A to the
Registration Rights Agreement dated June 13, 2003, by and among
Partnership and such investor parties, each investor party listed on
Schedule A to the Registration Rights Agreement dated July 30, 2004,
by and among Partnership and such investor parties, each investor party listed
on Schedule A to the Registration Rights Agreement dated November 9, 2005,
by and among Partnership and such investor parties and each investor party
listed on Schedule A to the Registration Rights Agreement dated December 23,
2005, by and among Partnership and such investor parties, in each case, solely
to the extent that such parties continue to have rights to a Piggyback
Registration (as defined in Section 2.4) pursuant to such agreements.

 

(g)           “Prospectus” means the prospectus included in the
Registration Statement, including all documents incorporated by reference
therein, and each prospectus supplement relating to the offering and sale of
any of the Registrable Securities.

 

(h)           “Register,” “registered,” and “registration”  refer
to a registration effected by preparing and filing a registration statement in
compliance with the Securities Act, and the declaration or ordering of
effectiveness of such registration statement or document.

 

(i)            “Registrable
Securities”  means
Common Units acquired by the Holders in the Merger or pursuant to the Class B
Acquisition and any other equity interests of the Partnership issued in respect
of such Common Units as a result of splits, dividends, reclassification,
recapitalizations, mergers, consolidations or similar events.  Any Registrable Securities will cease to be
Registrable Securities when (i) such Registrable Securities have been
disposed of pursuant to the Registration Statement or Rule 144 (or any
similar provision then in force under the Securities Act), (ii) such
Registrable Securities are eligible for resale pursuant to Rule 144(k) (or
any similar provision then in force under the Securities Act)) or (iii) such 

 

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Registrable Securities
are no longer held by the Holder or its transferees or assignees permitted
under Section 2.6.

 

(j)            “Registration
Expenses”  means
all expenses incurred by the Partnership in complying with Sections 2.1
and 2.4 hereof, including, without limitation, all registration and filing
fees, printing expenses, fees and disbursements of counsel for the Partnership,
blue sky fees and expenses and the expense of any special audits incident to or
required by any such registration (but excluding the compensation of regular
employees of the Partnership which shall be paid in any event by the
Partnership).

 

(k)           “SEC” or “Commission”  means
the Securities and Exchange Commission.

 

(l)            “Securities
Act”  means
the Securities Act of 1933, as amended.

 

(m)          “Selling Expenses” means all fees and disbursements of
counsel to the Holders and all underwriting discounts, selling commissions and
brokerage fees applicable to the sale of Registrable Securities.

 

(n)           “Underwritten Offering”
means an offering in which Common Units are sold to an underwriter on a firm
commitment basis for reoffering to the public or an offering that is a “bought
deal” with one or more investment banks or any similar offering.

 

SECTION 2.                            REGISTRATION; RESTRICTIONS ON
TRANSFER.

 

2.1          Registration Rights.

 

(a)           As soon as practicable after the Closing (as defined
in the Merger Agreement), and in any event within forty-five (45) days after
the Closing (or such earlier date as any other registration statement covering
the resale of Common Units issued pursuant to the Class B Agreement is
filed), the Partnership shall prepare and file with the Commission a
Registration Statement (the “Registration Statement”)
which would permit the secondary resale thereunder of the Registrable
Securities, subject to the terms and conditions of this Agreement.  The Partnership shall use its commercially
reasonable efforts to cause the Registration Statement to become effective no
later than one-hundred fifty (150) days after the date of the Closing; provided, if the Commission notifies the Partnership that it
will not review the Registration Statement and that the Partnership may request
the acceleration of the effectiveness of the Registration Statement, the
Partnership shall request that the staff of the Commission declare the
Registration Statement effective within four (4) Business Days after
receiving such notice of no review from the Commission.  The term “Registration Statement” shall also
include all exhibits and financial statements and schedules and documents
incorporated by reference in such Registration Statement.

 

(b)           The Registration Statement shall cover the resale of
all the Registrable Securities for offering and sale on a delayed or continuous
basis pursuant to Rule 415 under the Securities Act.  The section of the Registration Statement
entitled “Plan of Distribution” shall be prepared in accordance with the
requirements of Item 508 of Regulation S-K promulgated by the Commission under
the Securities Act (“Regulation S-K”)
and shall be in such form as the 

 

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Partnership and the
Holders may reasonably agree.  The
section of the Registration Statement entitled “Plan of Distribution” shall
also state (i) that the Holders may from time to time make sales of
Registrable Securities pursuant to and in accordance with Rule 145(d) and/or
Rule 144 under the Securities Act and (ii) that the Holders may from
time to time make a private sale of Registrable Securities directly to the
purchasers thereof in a transaction that does not involve any public offer or
sale of Registrable Securities; provided that
in the case of such private sale, the securities so sold shall not thereafter
be subject to resale pursuant to the Registration Statement.

 

2.2          Expenses of Registration.  Except as specifically provided herein, all
Registration Expenses incurred in connection with any registration,
qualification or compliance pursuant to Sections 2.1 and 2.4 herein shall
be borne by the Partnership.  Each Holder
shall pay all Selling Expenses incurred in connection with any registration,
sale or disposition of its Registrable Securities hereunder.

 

2.3          Obligations with Respect to
Registration.

 

(a)           In connection with the Partnership’s obligations under
Section 2.1 hereof to effect the registration of the Registrable
Securities under the Securities Act, the Partnership shall:

 

(i)            subject to Section 2.3(b), use its commercially
reasonable efforts to cause the Registration Statement to remain effective, and
prepare and file with the Commission any amendments and supplements to the
Registration Statement and to the Prospectus used in connection therewith as
may be necessary to keep the Prospectus current and in compliance in all
material respects with the provisions of the Securities Act, until the earlier
to occur of (A) the later of (i) the expiration of a two-year period
following the date of this Agreement, or (ii) such time as no Holder is an
affiliate of the Partnership within the meaning of Rule 405 of the rules and
regulations of the Securities Act, (B) the sale of all of the Registrable
Securities covered by the Registration Statement, or (C) the tenth (10th)
anniversary of the closing of the Merger;

 

(ii)           notify each Holder, (A) when the filing of a
post-effective amendment to the Registration Statement or supplement to the
Prospectus is required, when the same is filed, and in the case of a
post-effective amendment, when the same becomes effective, (B) of any
request by the Commission for any amendment of or supplement to the
Registration Statement or any Prospectus relating thereto and (C) of the
entry of any stop order suspending the effectiveness of such Registration
Statement or of the initiation of any proceedings for that purpose;

 

(iii)         furnish to each Holder a conformed copy of the
Registration Statement as declared effective by the Commission and of each
post-effective amendment thereto, and such number of copies of the final
Prospectus and of each supplement thereto as may reasonably be required to
facilitate the distribution of the Registrable Securities included in such
Registration Statement;

 

(iv)          register or qualify the Registrable Securities covered
by the Registration Statement under such other securities or Blue Sky laws of
such jurisdictions as shall be reasonably requested by the Holders; provided that the Partnership shall not be required in 

 

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connection therewith or
as a condition thereto to qualify to do business or to file a general consent
to service of process in any such states or jurisdictions.

 

(b)           Notwithstanding anything to the contrary contained
herein, if at any time after the filing of the Registration Statement, the
Partnership determines, in its reasonable business judgment, that such
registration and offering could interfere with or otherwise adversely affect
any financing, acquisition, corporate reorganization, or other material
transaction or development involving the Partnership or any of its affiliates
or require the Partnership to disclose matters that otherwise would not be
required to be disclosed at such time, then the Partnership may suspend the
Holders’ use of any Prospectus which is a part of the Registration Statement
(in which event the Holders shall discontinue sales of Registrable Securities
pursuant to the Registration Statement) by giving notice to the Holders.  Any such notice need not specify the reasons
for such suspension if the Partnership determines, in its reasonable business
judgment, that doing so would interfere with or adversely affect such
transaction or development or would result in the disclosure of material
non-public information.  In the event
that such notice is given, then until the Partnership has determined, in its
reasonable business judgment, that such registration and offering would no
longer interfere with the matters described in the preceding sentence and has
given notice thereof to the Holders, the Partnership’s obligations under Section 2.3(a)(i) will
be suspended.  In the event of a
suspension pursuant to this Section 2.3(b), then upon notice from the
Partnership that such suspension is no longer in effect, the Holders may
recommence distribution of Registrable Securities.  Notwithstanding anything to the contrary contained
herein, in no event shall any suspension under this Section 2.3(b) exceed
sixty (60) days in any one hundred eighty (180)-day period or ninety (90) days
in any 365 day period.

 

(c)           The Partnership’s obligations under this Agreement
shall be conditioned upon the Holders’ compliance with the following:

 

(i)            each Holder shall cooperate with the Partnership in
connection with the preparation of the Registration Statement, and for so long
as the Partnership is obligated to keep the Registration Statement effective,
such Holder will provide to the Partnership, in writing, for use in the
Registration Statement, all information regarding such Holder and such other
information as may be necessary to enable the Partnership to prepare the
Registration Statement and Prospectus covering the Registrable Securities and
to maintain the currency and effectiveness thereof;

 

(ii)           each Holder shall permit the Partnership,
underwriters, agents or broker-dealers of the offering or other distribution
and their respective representatives and agents to examine such documents and
records and shall supply any information as they may reasonably request in
connection with the offering or other distribution in which such Holder
proposes to participate;

 

(iii)         each Holder shall enter into such agreements with the
Partnership and any underwriter, broker-dealer or similar securities industry
professional containing representations, warranties, indemnities and agreements
as are in each case customarily entered into and made by selling
securityholders; and

 

5

 

(iv)          on notice from the Partnership of the happening of any
of the events specified in clauses (A), (B) or (C) of Section 2.3(a)(ii),
or that, as set forth in Section 2.3(b), it requires the suspension by the
Holders of the distribution of any of the Registrable Securities, then the
Holders shall cease offering or distributing the Registrable Securities until
such time as the Partnership notifies the Holders that offering and distribution
of the Registrable Securities may recommence; provided,
however, nothing contained herein shall
in any way limit the ability of the Holders to sell Registrable Securities in a
private offering in which such Registrable Securities may be sold in compliance
with the Securities Act without registration.

 

(d)           Notwithstanding any other provision of this Agreement,
no Holder shall be entitled to “demand” rights or similar rights that would
require the Partnership to effect an Underwritten Offering of Registrable
Securities on such Holder’s behalf.

 

2.4          Piggyback Registration.

 

(a)           If the Partnership or any subsidiary of the
Partnership at any time proposes to (i) file a prospectus supplement to an
effective shelf registration statement with respect to an Underwritten Offering
of Common Units for its own account or (ii) register any Common Units for
its own account for sale to the public in an Underwritten Offering other than,
in the case of clause (ii), (A) a registration relating solely to
employee benefit plans, (B) a registration relating solely to a Rule 145
transaction, or (C) a registration on any registration form which does not
permit secondary sales, then, as soon as practicable following the engagement
of counsel by Partnership to prepare the documents to be used in connection
with an Underwritten Offering, Partnership shall give written notice of such
proposed Underwritten Offering to the Holders and such notice shall offer the
Holders the opportunity to include in such Underwritten Offering such number of
Registrable Securities as each such Holder may request in writing (a “Piggyback Registration”); provided, however, that
Partnership shall not be required to offer such opportunity to Holders to the
extent Partnership has been advised by the Managing Underwriter of such
Underwritten Offering that the inclusion of Registrable Securities for sale for
the benefit of the Holders will have a materially adverse effect on the price,
timing or distribution of the Common Units.  The notice required to be
provided in this Section 2.4(a) to Holders shall be provided on a
Business Day pursuant to Section 3.1 hereof and receipt of such notice
shall be confirmed by the Holder. 
Subject to Section 2.4(b), Partnership shall include in such
Underwritten Offering all such Registrable Securities (“Included
Registrable Securities”) with respect to which Partnership has
received requests from Holders (each, a “Participating Holder”
and collectively, the “Participating Holders”)  within  three (3) Business Days after Partnership’s
notice has been delivered in accordance with Section 3.1, except that
Holders shall have one (1) Business Day after receipt of such notice to
request inclusion in the case of a “bought deal” or “overnight” offering. 
If no request for inclusion from a Holder is received within the specified
time, such Holder shall have no further right to participate in such Piggyback
Registration.  If, at any time after
giving written notice of its intention to undertake an Underwritten Offering
and prior to the closing of such Underwritten Offering, Partnership shall
determine for any reason not to undertake or to delay such Underwritten
Offering, Partnership may, at its election, give written notice of such
determination to the Participating Holders and, (i) in the case of a
determination not to undertake such Underwritten Offering, shall be relieved of
its obligation to sell any Included Registrable Securities in connection with
such terminated Underwritten 

 

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Offering, and (ii) in
the case of a determination to delay such Underwritten Offering, shall be
permitted to delay offering any Included Registrable Securities for the same
period as the delay in the Underwritten Offering.  Any Participating Holder shall have the right
to withdraw such Participating Holder’s request for inclusion of such
Participating Holder’s Registrable Securities in such Underwritten Offering by
giving written notice to Partnership of such withdrawal up to and including the
time of pricing of such Underwritten Offering.

 

(b)           If the Managing Underwriter or Underwriters of any
proposed Underwritten Offering of Common Units included in a Piggyback
Registration advises Partnership that the total amount of Common Units which
the Participating Holders and any other persons intend to include in such
Underwritten Offering exceeds the number which can be sold in such offering
without having an adverse effect on the price, timing or distribution of the
Common Units offered or the market for the Common Units, then the Common Units
to be included in such Underwritten Offering shall include the number of
Registrable Securities that such Managing Underwriter or Underwriters advises
Partnership can be sold without having such materially adverse effect, with such
number to be allocated (i) first to the Partnership and, (ii) second,
pro rata among the Participating Holders
and Prior Holders who have requested participation in the Piggyback
Registration (based, for each such Participating Holder or Prior Holder, as applicable,
on the percentage derived by dividing (A) the number of Registrable
Securities proposed to be sold by such Participating Holder or Prior Holder in
such offering by (B) the aggregate number of Common Units proposed to be
sold by the Participating Holders and Prior Holders participating in the
Piggyback Registration to be included in such offering).

 

(c)           The Piggyback
Registration rights granted pursuant to this Section 2.4 shall terminate
on the third anniversary of the closing of the Merger.

 

(d)           In connection with any Underwritten
Offering contemplated under this Agreement, the Partnership shall be entitled
to select the Managing Underwriter or Underwriters.  In connection
with an Underwritten Offering under this Section 2.4, each Participating  Holder and the Partnership shall be obligated
to enter into an underwriting agreement which contains such representations,
covenants, indemnities and other rights and obligations as are customary in
underwriting agreements for firm commitment offerings of securities.  No
Participating Holder may participate in such Underwritten Offering unless such
Participating Holder agrees to sell its Registrable Securities on the basis
provided in such underwriting agreement and completes and executes all questionnaires,
powers of attorney, indemnities and other documents reasonably required under
the terms of such underwriting agreement.  Each Participating Holder may,
at its option, require that any or all of the representations and warranties
by, and the other agreements on the part of, the Partnership to and for the
benefit of such underwriters also be made to and for such Participating Holder’s
benefit and that any or all of the conditions precedent to the obligations of
such underwriters under such underwriting agreement also be conditions
precedent to its obligations.  No
Participating Holder shall be required to make any representations, warranties
or agreements with the Partnership or the underwriters other than representations,
warranties or agreements regarding such Participating Holder and its ownership
of the securities being registered on its behalf and its intended method of
distribution and any other representation required by law.  If any Participating Holder disapproves of
the terms of an underwriting, such Participating Holder may elect to withdraw
therefrom by notice to the Partnership and the Managing Underwriter; 

 

7

 

provided, however, that such withdrawal must be made prior to the time
in the last sentence of Section 2.4(a) to be effective.

 

(e)           Each
Participating Holder in any Underwritten Offering shall agree in writing not to
effect any public sale or distribution of Registrable Securities included in
the Registration Statement during such period as may be requested by the
Managing Underwriter of such Underwritten Offering; provided, that the duration
of the foregoing restriction shall be no longer than the duration of the
shortest restriction generally imposed by the Managing Underwriter or Underwriters
on the officers and directors of the Partnership’s general partner.

 

2.5          Indemnification.

 

(a)           To the extent permitted by law, the Partnership will
indemnify and hold harmless each Holder, the partners, members, officers and
directors of each Holder, any underwriter (as defined in the Securities Act)
for such Holder and each person, if any, who controls such Holder or
underwriter within the meaning of the Securities Act or the Exchange Act,
against any losses, claims, damages, or liabilities (joint or several) to which
they may become subject under the Securities Act, the Exchange Act or other
federal or state law, insofar as such losses, claims, damages or liabilities
(or actions in respect thereof) arise out of or are based upon any of the
following statements, omissions or violations (collectively a “Violation”) by the Partnership: (i) any
untrue statement or alleged untrue statement of a material fact contained in
such Registration Statement or incorporated reference therein, including any
Prospectus contained therein or any amendments or supplements thereto or (ii) the
omission or alleged omission to state therein a material fact required to be
stated therein, or necessary to make the statements therein not misleading; and
the Partnership will reimburse each such Holder, partner, member, officer,
director, underwriter or controlling person for any legal or other expenses
reasonably incurred by them in connection with investigating or defending any
such loss, claim, damage, liability or action; provided however,
that the indemnity agreement contained in this Section 2.5(a) shall
not apply to amounts paid in settlement of any such loss, claim, damage,
liability or action if such settlement is effected without the consent of the
Partnership, which consent shall not be unreasonably withheld, nor shall the
Partnership be liable in any such case for any such loss, claim, damage,
liability or action to the extent that it arises out of or is based upon a
Violation which occurs in reliance upon and in conformity with written
information furnished specifically for use in connection with such registration
by or on behalf of such Holder, partner, member, officer, director, underwriter
or controlling person of such Holder.

 

(b)           To the extent permitted by law, each Holder will, if
Registrable Securities held by such Holder are included in the securities as to
which such registration qualifications or compliance is being effected,
indemnify and hold harmless the Partnership, each of its directors, its
officers and each person, if any, who controls the Partnership within the
meaning of the Securities Act, any underwriter and any other Holder selling
securities under such registration statement or any of such other Holder’s
partners, directors or officers or any person who controls such Holder, against
any losses, claims, damages or liabilities (joint or several) to which the
Partnership or any such director, officer, controlling person, underwriter or
other such Holder, or partner, director, officer or controlling person of such
other Holder may become subject under the Securities Act, the Exchange Act or
other federal or state law, insofar as such losses, claims, damages or
liabilities (or actions in respect thereto) arise out of or are based upon any
of the 

 

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following statements: (i) any
untrue statement or alleged untrue statement of a material fact contained in
such Registration Statement or incorporated reference therein, including any
Prospectus contained therein or any amendments or supplements thereto or (ii) the
omission or alleged omission to state therein a material fact required to be
stated therein, or necessary to make the statements therein not misleading
(collectively, a “Holder Violation”), in each
case to the extent (and only to the extent) that such Holder Violation occurs
in reliance upon and in conformity with written information furnished by or on
behalf of such Holder, in such Holder’s individual capacity as a holder of
Common Units, specifically for use in connection with such registration; and
each such Holder will reimburse any legal or other expenses reasonably incurred
by the Partnership or any such director, officer, controlling person,
underwriter or other Holder, or partner, officer, director or controlling
person of such other Holder in connection with investigating or defending any
such loss, claim, damage, liability or action if it is judicially determined
that there was such a Holder Violation; provided, however,
that the indemnity agreement contained in this Section 2.5(b) shall
not apply to amounts paid in settlement of any such loss, claim, damage,
liability or action if such settlement is effected without the consent of the
Holder, which consent shall not be unreasonably withheld; provided further,
that in no event shall any indemnity under this Section 2.5 exceed the net proceeds from the offering
received by such Holder.

 

(c)           Promptly after receipt by an indemnified party under
this Section 2.5 of notice of the commencement of any action (including
any governmental action), such indemnified party will, if a claim in respect
thereof is to be made against any indemnifying party under this Section 2.5,
deliver to the indemnifying party a written notice of the commencement thereof
and the indemnifying party shall have the right to participate in, and, to the
extent the indemnifying party so desires, jointly with any other indemnifying
party similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties; provided, however,
that an indemnified party shall have the right to retain its own counsel, with
the fees and expenses thereof to be paid by the indemnifying party, if
representation of such indemnified party by the counsel retained by the
indemnifying party would be inappropriate due to actual or potential differing
interests between such indemnified party and any other party represented by
such counsel in such proceeding.   The
failure to deliver written notice to the indemnifying party within a reasonable
time of the commencement of any such action shall relieve such indemnifying
party of any liability to the indemnified party under this Section 2.5 to
the extent, and only to the extent, prejudicial to its ability to defend such
action, but the omission so to deliver written notice to the indemnifying party
will not relieve it of any liability that it may have to any indemnified party
otherwise than under this Section 2.5.

 

(d)           If the indemnification provided for in this Section 2.5
is held by a court of competent jurisdiction to be unavailable to an
indemnified party with respect to any losses, claims, damages or liabilities
referred to herein, the indemnifying party, in lieu of indemnifying such
indemnified party thereunder, shall to the extent permitted by applicable law
contribute to the amount paid or payable by such indemnified party as a result
of such loss, claim, damage or liability in such proportion as is appropriate
to reflect the relative fault of the indemnifying party on the one hand and of
the indemnified party on the other in connection with the Violation(s) or
Holder Violation(s) that resulted in such loss, claim, damage or
liability, as well as any other relevant equitable considerations.  The relative fault of the indemnifying party
and of the indemnified party shall be determined by a court of law by reference
to, among other things, 

 

9

 

whether the untrue or
alleged untrue statement of a material fact or the omission to state a material
fact relates to information supplied by the indemnifying party or by the
indemnified party and the parties’ relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission; provided, that
in no event shall any contribution by a Holder hereunder exceed the net
proceeds from the offering received by such Holder.

 

(e)           The obligations of the Partnership and Holders under
this Section 2.5 shall survive completion of any offering of Registrable
Securities in a registration statement and, with respect to liability arising
from an offering to which this Section 2.5 would apply that is covered by
a registration filed before termination of this Agreement, such
termination.  No indemnifying party, in
the defense of any such claim or litigation, shall, except with the consent of
each indemnified party, consent to entry of any judgment or enter into any
settlement which does not include as an unconditional term thereof the giving
by the claimant or plaintiff to such Indemnified Party of a release from all
liability in respect to such claim or litigation.

 

2.6          Assignment of Registration
Rights.  The rights to cause the Partnership to register and
maintain the registration of Registrable Securities pursuant to this Section 2
may be assigned by a Holder to a transferee or assignee of Registrable
Securities (for so long as such shares remain Registrable Securities) that (a) is
a subsidiary, parent, general partner, limited partner, retired partner, member
or retired member, or stockholder of a Holder that is a corporation,
partnership or limited liability company, (b) is a Holder’s family member
or trust for the benefit of an individual Holder, or (c) is an entity
affiliated by common control (or other related entity) with such Holder; provided, however, (i) the
transferor shall, within ten (10) days after such transfer, furnish to the
Partnership written notice of the name and address of such transferee or
assignee and the securities with respect to which such registration rights are
being assigned and (ii) such transferee shall agree in writing to be
subject to all of the obligations and restrictions of the Holders set forth in
this Agreement.

 

SECTION 3.                            MISCELLANEOUS.

 

3.1          Notices. 
All notices and other communications hereunder shall be in writing and
shall be deemed given when delivered personally or by telecopy (upon telephonic
confirmation of receipt) or on the first Business Day following the date of
dispatch if delivered by a recognized next day courier service.  All notices hereunder shall be delivered as
set forth below or pursuant to such other instructions as may be designated in
writing by the party to receive such notice:

 

If to the Partnership,
to:

 

MarkWest Energy
GP, L.L.C.

Attn:  General Counsel

1515 Arapahoe
Street

Tower 2, Suite 700

Denver,
Colorado  80202

Fax:  (303) 290-8769

 

10

 

With copies to:

 

Vinson & Elkins L.L.P.

Attn:  Michael J. Swidler

666 Fifth Avenue,
26th Floor

New York, NY  10103

Fax:  (212) 237-0100

 

Andrews Kurth LLP

Attn:  Bill Cooper

1350 I Street,
N.W., Suite 1100

Washington,
D.C.  20005

Fax:  (202) 662-2739

 

If to a Holder, to:

 

MWHC Holding, Inc.

Attn:  John Fox

155 Inverness
Drive West, #330

Englewood, Colorado  80112

Fax:  (303) 649-2138

 

With copies to:

 

Cooley Godward
Kronish LLP

Attn:  Francis R. Wheeler, Esq.

380 Interlocken
Crescent, Suite 900

Broomfield,
Colorado  80021

Fax:  (720) 566-4099

 

3.2          Interpretation. 
The words “hereof,” “herein” and “hereunder” and words of similar import
when used in this Agreement shall refer to this Agreement as a whole and not to
any particular provision of this Agreement, and Section references are to
this Agreement unless otherwise specified. 
Whenever the words “include,” “includes” or “including” are used in this
Agreement, they shall be deemed to be followed by the words “without
limitation.”  The meanings given to terms
defined herein shall be equally applicable to both the singular and plural
forms of such terms.  The table of
contents and headings contained in this Agreement are for reference purposes
only and shall not affect in any way the meaning or interpretation of this
Agreement. This Agreement is the product of negotiation by the parties having
the assistance of counsel and other advisers. 
It is the intention of the parties that this Agreement not be construed
more strictly with regard to one party than with regard to the others.

 

3.3          Counterparts. 
This Agreement may be executed by facsimile and in counterparts, all of
which shall be considered one and the same agreement and shall become effective
when counterparts have been signed by each of the parties and delivered to the
other parties, it being understood that all parties need not sign the same
counterpart.

 

11

 

3.4          Entire Agreement. 
This Agreement together with the exhibit hereto, embody the complete
agreement and understanding among the parties hereto with respect to the
subject matter hereof and supersede and preempt any prior understandings,
agreements or representations by or among the parties, written and oral, that
may have related to the subject matter hereof in any way.

 

3.5          Governing Law; Consent to
Jurisdiction; Waiver of Jury Trial.

 

(a)           This Agreement shall be governed by and construed in accordance
with the laws of the State of Delaware, regardless of the laws that might
otherwise govern under applicable principles of conflicts of laws thereof.  In addition, each of the parties hereto (i) consents
to submit itself to the personal jurisdiction of the Court of Chancery of the
State of Delaware (and any appellate court of the State of Delaware) and the
Federal courts of the United States of America located in the State of Delaware
in the event any dispute arises out of this Agreement or the transactions
contemplated by this Agreement, (ii) agrees that it will not attempt to
deny or defeat such personal jurisdiction by motion or other request for leave
from any such court and (iii) agrees that it will not bring any action
relating to this Agreement or the transactions contemplated by this Agreement
in any court other than the Court of Chancery of the State of Delaware or a
Federal court of the United States of America located in the State of Delaware.

 

(b)           EACH PARTY HERETO HEREBY WAIVES, TO THE FULLEST EXTENT
PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN
RESPECT OF ANY SUIT, ACTION OR OTHER PROCEEDING ARISING OUT OF THIS AGREEMENT
OR THE TRANSACTIONS CONTEMPLATED HEREBY. EACH PARTY HERETO (A) CERTIFIES
THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED,
EXPRESSLY OR OTHERWISE, THAT SUCH PARTY WOULD NOT, IN THE EVENT OF ANY ACTION,
SUIT OR PROCEEDING, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES
THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS
AGREEMENT, BY, AMONG OTHER THINGS, THE MUTUAL WAIVER AND CERTIFICATIONS IN THIS
SECTION 3.5.

 

3.6          Amendment; Waiver. 
This Agreement may not be amended except by an instrument in writing
signed by the Partnership and each Holder. 
Each party may waive any right of such party hereunder by an instrument
in writing signed by such party and delivered to the Partnership and the
Holders.

 

3.7          Remedies.  All rights, powers and remedies provided under this
Agreement or otherwise available in respect hereof at law or in equity shall be
cumulative and not alternative, and the exercise or beginning of the exercise
of any thereof by any party shall not preclude the simultaneous or later
exercise of any other such right, power or remedy by such party.

 

3.8          Severability. 
Any term or provision of this Agreement which is determined by a court
of competent jurisdiction to be invalid or unenforceable in any jurisdiction
shall, as to that jurisdiction, be ineffective to the extent of such invalidity
or unenforceability without rendering invalid or unenforceable the remaining
terms and provisions of this Agreement or affecting the 

 

12

 

validity or
enforceability of any of the terms or provisions of this Agreement in any other
jurisdiction, and if any provision of this Agreement is determined to be so
broad as to be unenforceable, the provision shall be interpreted to be only so
broad as is enforceable, in all cases so long as neither the economic nor legal
substance of the transactions contemplated hereby is affected in any manner
adverse to any party or its equityholders. 
Upon any such determination, the parties shall negotiate in good faith
in an effort to agree upon a suitable and equitable substitute provision to
effect the original intent of the parties as closely as possible and to the end
that the transactions contemplated hereby shall be fulfilled to the maximum
extent possible.

 

3.9          Successors and Assigns; Third Party
Beneficiaries.  Except to the extent provided in Section 2.6,
neither this Agreement nor any of the rights or obligations of any party under
this Agreement shall be assigned, in whole or in part (by operation of law or
otherwise), by any party without the prior written consent of the other parties
hereto.  Subject to the foregoing, this
Agreement shall bind and inure to the benefit of and be enforceable by the
parties hereto and their respective successors and permitted assigns.  Nothing in this Agreement, express or
implied, is intended to confer on any person other than (a) the parties
hereto or (b) the parties respective successors and permitted assigns any
rights, remedies, obligations or liabilities under or by reason of this
Agreement.

 

3.10        Holder Capacity.  Each Holder has entered into this Agreement solely in
such Holder’s capacity as the beneficial owner of Registrable Securities,
including Section 2.5 hereof; provided nothing herein shall in any way
limit or restrict any Holder from taking any action in his capacity as a
director or officer of the General Partner or the Partnership or otherwise
fulfilling his fiduciary obligations as a director or officer of the General
Partner or the Partnership.

 

[Remainder of this page intentionally
left blank]

 

13

 

IN WITNESS WHEREOF, the parties hereto have executed this REGISTRATION RIGHTS AGREEMENT as of the date set forth in
the first paragraph hereof.

 

	
  MARKWEST ENERGY PARTNERS, L.P.

  
	
   

  	
   

  
	
  By:

  	
  MarkWest Energy GP, L.L.C., its general partner

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  By: 

  	
  /S/ NANCY K. BUESE

  
	
   

  	
   

  	
  Nancy
  K. Buese

  
	
   

  	
   

  	
  Chief
  Financial Officer

  
	
   

  	
   

  	
   

  
	
  STOCKHOLDERS:

  
	
   

  
	
  /S/ JOHN M. FOX

  
	
  John M. Fox

  
	
   

  
	
  MWHC HOLDING, INC.

  
	
   

  
	
  By: 

  	
  /S/ JOHN M. FOX

  
	
   

  	
  Name: 

  	
  John M. Fox

  
	
   

  	
  Title:

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