THIS SENIOR INDENTURE dated as of , is among MARKWEST ENERGY PARTNERS, L.P., a Delaware limited partnership (the "Partnership") and WELLS FARGO BANK, a national banking association (the "Trustee").

WHEREAS, MarkWest Energy GP, L.L.C., a Delaware limited liability company (the "General Partner"), as general partner of the Partnership has duly authorized the execution and delivery of the Indenture to provide for the issuance from time to time of its debentures, notes, bonds or other evidences of indebtedness to be issued in one or more series in an unlimited aggregate principal amount (herein called the "Debt Securities"), as in the Indenture provided.

WHEREAS, all things necessary to make the Indenture a valid agreement of the Issuer, in accordance with its terms, have been done.

NOW, THEREFORE, in consideration of the agreements and obligations set forth herein and for good and valuable consideration, the sufficiency of which is hereby acknowledged, the Issuer and the Trustee hereby agree with each other, for the equal and proportionate benefit of the respective Holders from time to time of the Debt Securities or any series thereof, as follows:

SECTION 1.01. Certain Terms Defined. The terms defined in this Section 1.01 (except as herein otherwise expressly provided or unless the context otherwise requires) for all purposes of the Indenture and of any Indenture supplemental hereto shall have the respective meanings specified in this Section 1.01. All other terms used in the Indenture which are defined in the Trust Indenture Act or which are by reference therein defined in the Securities Act (except as herein otherwise expressly provided or unless the context otherwise requires), shall have the meanings assigned to such terms in the Trust Indenture Act and in the Securities Act as in force as of the date of original execution of the Indenture.

"Bankruptcy Law" means Title 11, U.S. Code or any similar federal or state law for the relief of debtors.

"Board of Directors" means the board of directors of the General Partner or, with respect to any determination or resolution required or permitted to be made hereunder, any duly authorized committee or subcommittee of such board.

"Board Resolution" means a copy of a resolution certified by the appropriate person to have been duly adopted by the Board of Directors and to be in full force and effect on the date of such certification.

"Business Day" means each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which banking institutions in Englewood, Colorado, the Borough of Manhattan, the City of New York, New York, or the city in which the Corporate Trust Office of the Trustee is located, are authorized or obligated by law or executive order to close.

"Code" means the Internal Revenue Code of 1986, as amended from time to time and any successor statute.

"Commission" means the Securities and Exchange Commission, as from time to time constituted, created under the Exchange Act, or, if at any time after the execution of the Indenture such Commission is not existing and performing the duties now assigned to it under the Trust Indenture Act, then the body performing such duties at such time.

"Corporate Trust Office of the Trustee" means the principal corporate trust office of the Trustee, at which at any particular time its corporate trust business shall be administered, which office at the date of execution of the Indenture is located at 505 Main Street, Suite 301, Fort Worth, Texas 76102, Attention: Corporate Trust Administration.

"Debt Security" or "Debt Securities" has the meaning stated in the first recital of the Indenture and more particularly means any debt security or debt securities, as the case may be, of any series authenticated and delivered under the Indenture.

"Default" means any event that is, or with the passage of time or the giving of notice or both would be, an Event of Default.

"Depositary" means, unless otherwise specified by the Issuer pursuant to either Section 2.03 or 2.15, with respect to registered Debt Securities of any series issuable or issued in whole or in part in the form of one or more Global Securities, The Depository Trust Company, New York, New York, or any successor thereto registered as a clearing agency under the Exchange Act or other applicable statute or regulations.

"Dollar" or "$" means such currency of the United States as at the time of payment is legal tender for the payment of public and private debts.

"Dollar Equivalent" means, with respect to any monetary amount in a Foreign Currency, at any time for the determination thereof, the amount of Dollars obtained by converting such Foreign Currency involved in such computation into Dollars at the spot rate for the purchase of Dollars with the applicable Foreign Currency as quoted by Citibank, N.A. (unless another comparable financial institution is designated by the Issuer) in New York, New York at approximately 11:00 a.m. (New York time) on the date two business days prior to such determination.

"Exchange Act" means the Securities Exchange Act of 1934, as amended, or any successor statute.

"Floating Rate Security" means a Debt Security that provides for the payment of interest at a variable rate determined periodically by reference to an interest rate index specified pursuant to Section 2.03.

"Foreign Currency" means a currency issued or adopted by the government of any country other than the United States or a composite currency the value of which is determined by reference to the values of the currencies of any group of countries.

"GAAP" means United States generally accepted accounting principles set forth in the opinions and pronouncements of the Accounting Principles Board of the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting Standards Board or in such other statements by such other entity as have been approved by a significant segment of the accounting profession, which are in effect from time to time.

"General Partner" means MarkWest Energy GP, L.L.C., a Delaware limited liability company, and its successors and permitted assigns as general partner of the Partnership.

"Global Security" means with respect to any series of Debt Securities issued hereunder, a Debt Security that is executed by the Issuer and authenticated and delivered by the Trustee to the Depositary or pursuant to the Depositary's instruction, all in accordance with the Indenture, or the applicable Board Resolution and set forth in an Officers' Certificate, which shall be registered in the name of the Depositary or its nominee and which shall represent, and shall be denominated in an amount equal to the aggregate principal amount of, all the Outstanding Debt Securities of such series or any portion thereof, in either case having the same terms, including, without limitation, the same original issue date, date or dates on which principal is due and interest rate or method of determining interest.

"Holder," "Holder of Debt Securities" or other similar terms mean, with respect to a Registered Security, the Registered Holder.

"Indenture" means this instrument as originally executed, or, if amended or supplemented as herein provided, as so amended or supplemented, and shall include the form and terms of particular series of Debt Securities as contemplated hereunder, whether or not a supplemental Indenture is entered into with respect thereto.

"Issuer Order" means a written order of the Issuer signed by the Chairman of the Board, President or any Vice President of each of the General Partner and by the Treasurer, Secretary, any Assistant Treasurer or any Assistant Secretary of the General Partner.

"Issuer" means the Partnership and, subject to the provisions of Article X, shall also include its successors and permitted assigns.

"Lien" means, with respect to any asset, any mortgage, lien (statutory or otherwise), pledge, charge, security interest, hypothecation, assignment for security, claim, preference, priority or encumbrance of any kind in respect of such asset, whether or not filed, recorded or otherwise perfected under applicable law, including any conditional sale or other title retention agreement or any lease in the nature thereof, any option or other agreement to grant a security interest in and any filing of or agreement to give any financing statement under the Uniform Commercial Code (or equivalent statute) of any jurisdiction, other than a precautionary financing statement respecting a lease not intended as a security agreement.

"Officers' Certificate" means a certificate signed by the Chairman of the Board of Directors, President or any Vice President of the General Partner and by the Treasurer, Secretary, any Assistant Treasurer or any Assistant Secretary of the General Partner. Each such certificate shall include the statements provided for in Section 12.05, if applicable.

"Opinion of Counsel" means an opinion in writing signed by legal counsel for the Issuer (which counsel may be an employee of the Issuer or outside counsel for the Issuer). Each such opinion shall include the statements provided for in Section 12.05, if applicable.

"Original Issue Discount Debt Security" means any Debt Security which provides for an amount less than the principal amount thereof to be due and payable upon a declaration or acceleration of the maturity thereof pursuant to Section 6.01.

"Outstanding" when used with respect to any series of Debt Securities, means, as of the date of determination, all Debt Securities of that series theretofore authenticated and delivered under the Indenture, except:

provided, however, that in determining whether the Holders of the requisite principal amount of the Outstanding Debt Securities of any series have given any request, demand, authorization, direction, notice, consent or waiver hereunder, Debt Securities owned by the Issuer or any other obligor upon the Debt Securities or any Subsidiary of the Issuer or of such other obligor shall be disregarded and deemed not to be Outstanding, except that, in determining whether the Trustee shall be protected in relying upon any such request, demand, authorization, direction, notice, consent or waiver, only Debt Securities which a Responsible Officer of the Trustee actually knows to be so owned shall be so disregarded. Debt Securities so owned which have been pledged in good faith may be regarded as Outstanding if the pledgee establishes to the satisfaction of the Trustee the pledgee's right so to act with respect to such Debt Securities and that the pledgee is not one of the Issuer or any other obligor upon the Debt Securities or a Subsidiary of the Issuer or of such other obligor. In determining whether the Holders of the requisite principal amount of outstanding Debt Securities have given any request, demand, authorization, direction, notice, consent or waiver hereunder, the principal amount of an Original Issue Discount Debt Security that shall be deemed to be Outstanding for such purposes shall be the amount of the principal thereof that would be due and payable as of the date of such determination upon a declaration of acceleration of the maturity thereof pursuant to Section 6.01. In determining whether the Holders of the requisite principal amount of the Outstanding Debt Securities of any series have given any request, demand, authorization, direction, notice, consent or waiver hereunder, the principal amount of a Debt Security denominated in one or more Foreign Currencies or currency units that shall be deemed to be Outstanding for such purposes shall be the Dollar Equivalent, determined in the manner provided as contemplated by Section 2.03 on the date of original issuance of such Debt Security, of the principal amount (or, in the case of any Original Issue Discount Security, the Dollar Equivalent on the date of original issuance of such Security of the amount determined as provided in the preceding sentence above) of such Debt Security.

"Partnership" means MarkWest Energy Partners, L.P., a Delaware limited partnership, and, subject to the provisions of Article X, shall also include its successors and assigns.

"Person" means any individual, corporation, partnership, joint venture, association, limited liability company, joint stock company, trust, unincorporated organization, government or any agency or political subdivision thereof or any other entity.

"Place of Payment" means, when used with respect to the Debt Securities of any series, the place or places where the principal of, and premium, if any, and interest on, the Debt Securities of that series are payable as specified pursuant to Section 2.03.

"Registered Holder" means the Person in whose name a Registered Security is registered in the Debt Security Register (as defined in Section 2.07(a)).

"Registered Security" means any Debt Security registered as to principal and interest in the Debt Security Register (as defined in Section 2.07(a)).

"Responsible Officer" when used with respect to the Trustee, means any officer within the Corporate Trust Office of the Trustee or any other officer of the Trustee performing functions similar to those performed by the persons who at the time shall be such officers, and any other officer of the Trustee to whom corporate trust matters are referred because of his knowledge of and familiarity with the particular subject.

"Securities Act" means the Securities Act of 1933, as amended, or any successor statute.

"Stated Maturity" means, at any time, with respect to any installment of interest or principal on any series of Debt Securities, the date on which such payment of interest or principal was scheduled to be paid in the original documentation governing such indebtedness or such later date as such documentation shall provide at that time, and shall not include any contingent obligations to repay, redeem or repurchase any such interest or principal prior to the date originally scheduled for the payment thereof.

"Trust Indenture Act" (except as herein otherwise expressly provided) means the Trust Indenture Act of 1939 as in force at the date of the Indenture as originally executed and, to the extent required by law, as amended, or any successor statute.

"Trustee" initially means Wells Fargo Bank, N.A. and any other Person or Persons appointed as such from time to time pursuant to Section 7.08, and, subject to the provisions of Article VII, includes its or their successors and assigns. If at any time there is more than one such Person, "Trustee" as used with respect to the Debt Securities of any series shall mean the Trustee with respect to the Debt Securities of that series.

"United States" means the United States of America (including the States and the District of Columbia), its territories, its possessions and other areas subject to its jurisdiction.

"U.S. Government Obligations" means securities that are (i) direct obligations of the United States for the payment of which its full faith and credit is pledged; (ii) obligations of a Person controlled or supervised by and acting as an agency or instrumentality of the United States, the payment of which is unconditionally guaranteed as a full faith and credit obligation by the United States, which, in either case, under clause (i) or (ii) above, are not callable or redeemable at the option of the issuers thereof; or (iii) depository receipts issued by a bank or trust company as custodian with respect to any such U.S. Government Obligations or a specific payment of interest on or principal of any such U.S. Government Obligation held by such custodian for the account of the holder of a depository receipt, provided that (except as required by law) such custodian is not authorized to make any deduction from the amount payable to the holder of such depository receipt from any amount received by the custodian in respect of the U.S. Government Obligation evidenced by such depository receipt.

"Voting Stock" of any Person as of any date means the Equity Interests of such Person pursuant to which the holders thereof have the general voting power under ordinary circumstances to elect at least a majority of the board of directors, managers, general partners or trustees of any Person (regardless of whether, at the time, Equity Interests of any other class or classes shall have, or might have, voting power by reason of the occurrence of any contingency) or, with respect to a partnership (whether general or limited), any general partner interest in such partnership.

"Yield to Maturity" means the yield to maturity calculated at the time of issuance of a series of Debt Securities, or, if applicable, at the most recent redetermination of interest on such series and calculated in accordance with accepted financial practice.

Term		Section in which Defined
"Debt Security Register		2.07
"Defaulted Interest"		2.17
"Designated Currency"		2.18
"mandatory sinking fund payment"		3.04
"optional sinking fund payment"		3.04
"Successor Company"		10.01

SECTION 1.03. Incorporation by Reference of Trust Indenture Act. The Indenture is subject to the mandatory provisions of the Trust Indenture Act which are incorporated by reference in and made a part of the Indenture. The following Trust Indenture Act terms have the following meanings:

"obligor" on the indenture securities means the Issuer and any other obligor on the Debt Securities.

All other Trust Indenture Act terms used in the Indenture that are defined by the Trust Indenture Act, reference to another statute or defined by rules of the Commission have the meanings assigned to them by such definitions.

SECTION 2.01. Forms Generally. The Debt Securities of each series shall be in substantially the form established without the approval of any Holder by or pursuant to a Board Resolution of the Issuer or in one or more Indentures supplemental hereto, in each case with such appropriate insertions, omissions, substitutions and other variations as are required or permitted by the Indenture, and may have such letters, numbers or other marks of identification and such legends or endorsements placed thereon as the Issuer may deem appropriate (and, if not contained in a supplemental Indenture entered into in accordance with Article IX, as are not prohibited by the provisions of the Indenture) or as may be required or appropriate to comply with any law or with any rules made pursuant thereto or with any rules of any securities exchange on which such series of Debt Securities may be listed, or to conform to general usage, or as may, consistently herewith, be determined by the officers executing such Debt Securities as evidenced by their execution of the Debt Securities.

The definitive Debt Securities of each series shall be printed, lithographed or engraved on steel engraved borders or may be produced in any other manner, all as determined by the officers executing such Debt Securities, as evidenced by their execution of such Debt Securities.

SECTION 2.02. Form of Trustee's Certificate of Authentication. The Trustee's Certificate of Authentication on all Debt Securities authenticated by the Trustee shall be in substantially the following form:

This is one of the Debt Securities of the series designated therein referred to in the within-mentioned Indenture.

SECTION 2.03. Principal Amount; Issuable in Series. The aggregate principal amount of Debt Securities which may be issued, executed, authenticated, delivered and outstanding under the Indenture is unlimited.

The Debt Securities may be issued in one or more series. There shall be established, without the approval of any Holders, in or pursuant to a Board Resolution of the Issuer and set forth in an Officers' Certificate of the Issuer, or established in one or more Indentures supplemental hereto, prior to the issuance of Debt Securities of any series any or all of the following:

All Debt Securities of any one series appertaining thereto shall be substantially identical except as to denomination and except as may otherwise be provided in or pursuant to such Board Resolutions and as set forth in such Officers' Certificates or in any such Indenture supplemental hereto.

SECTION 2.04. Execution of Debt Securities. The Debt Securities shall be signed on behalf of the Partnership by the Chairman of the Board, the President or a Vice President of the General Partner. Such signature upon the Debt Securities may be the manual or facsimile signatures of the

present or any future such authorized officers and may be imprinted or otherwise reproduced on the Debt Securities. The seals of the Issuer, if any, may be in the form of a facsimile thereof and may be impressed, affixed, imprinted or otherwise reproduced on the Debt Securities.

Only such Debt Securities as shall bear thereon a certificate of authentication substantially in the form hereinbefore recited, signed manually by the Trustee, shall be entitled to the benefits of the Indenture or be valid or obligatory for any purpose. Such certificate by the Trustee upon any Debt Security executed by the Issuer shall be conclusive evidence that the Debt Security so authenticated has been duly authenticated and delivered hereunder.

In case any officer of either of the General Partner who shall have signed any of the Debt Securities shall cease to be such officer before the Debt Securities so signed shall have been authenticated and delivered by the Trustee, or disposed of by the Issuer, such Debt Securities nevertheless may be authenticated and delivered or disposed of as though the Person who signed such Debt Securities had not ceased to be such officer of the General Partner; and any Debt Security may be signed on behalf of the Issuer by such Persons as, at the actual date of the execution of such Debt Security, shall be the proper officers of the General Partner, although at the date of such Debt Security or of the execution of the Indenture any such Person was not such officer.

SECTION 2.05. Authentication and Delivery of Debt Securities. At any time and from time to time after the execution and delivery of the Indenture, the Issuer may deliver Debt Securities of any series executed by the Issuer to the Trustee for authentication, and the Trustee shall thereupon authenticate and deliver said Debt Securities to or upon an Issuer Order. The Debt Securities shall be dated the date of their authentication. In authenticating such Debt Securities and accepting the additional responsibilities under the Indenture in relation to such Debt Securities, the Trustee shall be entitled to receive, and (subject to Section 7.01) shall be fully protected in relying upon:

Such Opinion of Counsel need express no opinion as to whether a court in the United States would render a money judgment in a Currency other than Dollars.

The Trustee shall have the right to decline to authenticate and deliver any Debt Securities under this Section 2.05 if the Trustee, being advised by counsel, determines that such action may not lawfully be taken or if the Trustee in good faith by its board of directors or trustees, executive committee or a trust committee of directors, trustees or vice presidents shall determine that such action would expose the Trustee to personal liability to existing Holders.

The Trustee may appoint an authenticating agent reasonably acceptable to the Issuer to authenticate Debt Securities of any series. Unless limited by the terms of such appointment, an authenticating agent may authenticate Debt Securities whenever the Trustee may do so. Each reference in the Indenture to authentication by the Trustee includes authentication by such agent. An authenticating agent has the same rights as any Registrar, paying agent or agent for service of notices and demands.

SECTION 2.06. Denomination of Debt Securities. Unless otherwise provided in the form of Debt Security for any series, the Debt Securities of each series shall be issuable only as Registered Securities in such denominations as shall be specified or contemplated by Section 2.03. In the absence of any such specification with respect to the Debt Securities of any series, the Debt Securities of such series shall be issuable in denominations of $1,000 and any integral multiple thereof.

SECTION 2.07. General Provisions for Registration of Transfer and Exchange. (a) The Issuer shall keep or cause to be kept a register for each series of Registered Securities issued hereunder (hereinafter collectively referred to as the "Debt Security Register"), in which, subject to such reasonable regulations as they may prescribe, the Issuer shall provide for the registration of Registered Securities and the transfer of Registered Securities as in this Article II provided. At all reasonable times the Debt Security Register shall be open for inspection by the Trustee. Subject to Section 2.15, upon due presentment for registration of transfer of any Registered Security at any office or agency to be maintained by the Issuer in accordance with the provisions of Section 4.02, the Issuer shall execute and the Trustee shall authenticate and deliver in the name of the transferee or transferees a new Registered Security or Registered Securities of authorized denominations for a like aggregate principal amount.

Unless and until otherwise determined by a Board Resolution of the Issuer, the register of the Issuer for the purpose of registration, exchange or registration of transfer of the Registered Securities shall be kept at the Corporate Trust Office of the Trustee and, for this purpose, the Trustee shall be designated "Registrar". No prior notice to the Holders of Debt Securities is required to effect the designation of a substitute Registrar by the Issuer.

Registered Securities of any series (other than a Global Security) may be exchanged for a like aggregate principal amount of Registered Securities of the same series of other authorized denominations. Subject to Section 2.15, Registered Securities to be exchanged shall be surrendered at the office or agency to be maintained by the Issuer as provided in Section 4.02, and the Issuer shall execute and the Trustee shall authenticate and deliver in exchange therefor the Registered Security or Registered Securities that the Holder making the exchange shall be entitled to receive.

(b) All Registered Securities presented or surrendered for registration of transfer, exchange or payment shall (if so required by the Issuer, the Trustee or the Registrar) be duly endorsed or be accompanied by a written instrument or instruments of transfer, in form satisfactory to the Issuer, the Trustee and the Registrar, duly executed by the Registered Holder or his attorney duly authorized in writing.

All Debt Securities issued in exchange for or upon transfer of Debt Securities shall be the legal, valid and binding obligations of the Issuer, evidencing the same debt, and entitled to the same benefits under the Indenture as the Debt Securities surrendered for such exchange or transfer.

No service charge shall be made for any exchange or registration of transfer of Debt Securities (except as provided by Section 2.09), but the Issuer may require payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto, other than those expressly provided in the Indenture to be made at the Issuer's own expense or without expense or without charge to the Holders.

The Issuer shall not be required (a) to issue, register the transfer of or exchange any Debt Securities of a series either (i) during a period beginning 15 Business Days next preceding any selection for redemption or repurchase of Debt Securities of such series and ending on the close of business on the day of giving the relevant notice of redemption or repurchase or (ii) between a record date and the next succeeding interest payment date, or (b) to register the transfer of or exchange any Debt Security called for redemption or repurchase (except, in the case of Debt Securities to be redeemed or repurchased in part, the portion not to be redeemed or repurchased).

Specific procedures for registration of transfer and exchange of any series of Debt Securities may be set forth in the applicable supplemental Indenture for such Debt Securities.

SECTION 2.08. Temporary Debt Securities. Pending the preparation of definitive Debt Securities of any series, the Issuer may execute and the Trustee shall authenticate and deliver temporary Debt Securities (printed, lithographed, photocopied, typewritten or otherwise produced) of any authorized denomination, and substantially in the form of the definitive Debt Securities in lieu of which they are issued, and with such omissions, insertions and variations as may be appropriate for temporary Debt Securities, all as may be determined by the Issuer with the concurrence of the Trustee. Temporary Debt Securities may contain such reference to any provisions of the Indenture as may be appropriate. Every temporary Debt Security shall be executed by the Issuer and be authenticated by the Trustee upon the same conditions and in substantially the same manner, and with like effect, as the definitive Debt Securities.

If temporary Debt Securities of any series are issued, the Issuer will cause definitive Debt Securities of such series to be prepared without unreasonable delay. After the preparation of definitive Debt Securities of such series, the temporary Debt Securities of such series shall be exchangeable for definitive Debt Securities of such series upon surrender of the temporary Debt Securities of such series at the office or agency of the Issuer at a Place of Payment for such series, without charge to the Holder thereof, except as provided in Section 2.07 in connection with a transfer, and upon surrender for cancellation of any one or more temporary Debt Securities of any series, the Issuer shall execute and the Trustee shall authenticate and deliver in exchange therefor a like principal amount of definitive Debt Securities of the same series of authorized denominations and of like tenor. Until so exchanged, temporary Debt Securities of any series shall in all respects be entitled to the same benefits under the Indenture as definitive Debt Securities of such series, except as otherwise specified as contemplated by Section 2.03(17) with respect to the payment of interest on Global Securities in temporary form.

Upon any exchange of a portion of a temporary Global Security for a definitive Global Security or for the individual Debt Securities represented thereby pursuant to Section 2.07 or this Section 2.08, the temporary Global Security shall be endorsed by the Trustee to reflect the reduction of the principal amount evidenced thereby, whereupon the principal amount of such temporary Global Security shall be reduced for all purposes by the amount so exchanged and endorsed.

SECTION 2.09. Mutilated, Destroyed, Lost or Stolen Debt Securities. If (i) any mutilated Debt Security is surrendered to the Trustee at the Corporate Trust Office of the Trustee (in the case of Registered Securities) or (ii) the Issuer and the Trustee receive evidence to their satisfaction of the destruction, loss or theft of any Debt Security, and there is delivered to the Issuer and the Trustee such security or indemnity as may be required by them to save each of them and any paying agent harmless, and neither the Issuer nor the Trustee receives written notice that such Debt Security has been acquired by a bona fide purchaser, then the Issuer shall execute and, upon an Issuer Order, the Trustee

shall authenticate and deliver, in exchange for or in lieu of any such mutilated, destroyed, lost or stolen Debt Security, a new Debt Security of the same series of like tenor, form, terms and principal amount, bearing a number not contemporaneously Outstanding. Upon the issuance of any substituted Debt Security, the Issuer may require the payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto and any other expenses connected therewith. In case any Debt Security which has matured or is about to mature or which has been called for redemption shall become mutilated or be destroyed, lost or stolen, the Issuer may, instead of issuing a substituted Debt Security, pay or authorize the payment of the same (without surrender thereof except in the case of a mutilated Debt Security) if the applicant for such payment shall furnish the Issuer and the Trustee with such security or indemnity as either may require to save it harmless from all risk, however remote, and, in case of destruction, loss or theft, evidence to the satisfaction of the Issuer and the Trustee of the destruction, loss or theft of such Debt Security and of the ownership thereof.

Every substituted Debt Security of any series issued pursuant to the provisions of this Section 2.09 by virtue of the fact that any Debt Security is destroyed, lost or stolen shall constitute an original additional contractual obligation of the Issuer, whether or not the destroyed, lost or stolen Debt Security shall be found at any time, and shall be entitled to all the benefits of the Indenture equally and proportionately with any and all other Debt Securities of that series duly issued hereunder. All Debt Securities shall be held and owned upon the express condition that the foregoing provisions are exclusive with respect to the replacement or payment of mutilated, destroyed, lost or stolen Debt Securities, and shall preclude any and all other rights or remedies, notwithstanding any law or statute existing or hereafter enacted to the contrary with respect to the replacement or payment of negotiable instruments or other securities without their surrender, in each case to the fullest extent permitted by law.

SECTION 2.10. Cancellation of Surrendered Debt Securities. All Debt Securities surrendered for payment, redemption, registration of transfer or exchange shall, if surrendered to the Issuer or any paying agent or a Registrar, be delivered to the Trustee for cancellation by it, or if surrendered to the Trustee, shall be canceled by it, and no Debt Securities shall be issued in lieu thereof except as expressly permitted by any of the provisions of the Indenture. All canceled Debt Securities held by the Trustee shall be disposed of by the Trustee in its customary manner. On request of the Issuer, the Trustee shall deliver to the Issuer canceled Debt Securities held by the Trustee. If the Issuer shall acquire any of the Debt Securities, however, such acquisition shall not operate as a redemption or satisfaction of the indebtedness represented thereby unless and until the same are delivered or surrendered to the Trustee for cancellation. The Issuer may not issue new Debt Securities to replace Debt Securities it has redeemed, paid or delivered to the Trustee for cancellation.

SECTION 2.11. Provisions of the Indenture and Debt Securities for the Sole Benefit of the Parties and the Holders. Nothing in the Indenture or in the Debt Securities, expressed or implied, shall give or be construed to give to any Person, other than the parties hereto, the Holders or any Registrar or paying agent, any legal or equitable right, remedy or claim under or in respect of the Indenture, or under any covenant, condition or provision herein contained, all its covenants, conditions and provisions being for the sole benefit of the parties hereto, the Holders and any Registrar and paying agents.

SECTION 2.12. Payment of Interest; Rights Preserved. (a) Interest on any Registered Security that is payable and is punctually paid or duly provided for on any interest payment date shall be paid to the Person in whose name such Registered Security is registered at the close of business on the regular record date for such interest notwithstanding the cancellation of such Registered Security upon any transfer or exchange subsequent to the regular record date. Payment of interest on Registered Securities shall be made at the Corporate Trust Office of the Trustee (except as otherwise specified pursuant to Section 2.03), or at the option of the Issuer, by check mailed to the address of the Person entitled thereto as such address shall appear in the Debt Security Register or, if provided pursuant to

Section 2.03 and in accordance with arrangements satisfactory to the Trustee, at the option of the Registered Holder by wire transfer to an account designated by the Registered Holder.

(b) Subject to the foregoing provisions of this Section 2.12 and Section 2.17, each Debt Security of a particular series delivered under the Indenture upon registration of transfer of or in exchange for or in lieu of any other Debt Security of the same series shall carry the rights to interest accrued and unpaid, and to accrue, which were carried by such other Debt Security.

SECTION 2.13. Securities Denominated in Foreign Currencies. (a) Except as otherwise specified pursuant to Section 2.03 for Registered Securities of any series, payment of the principal of, and premium, if any, and interest on, Registered Securities of such series will be made in Dollars.

(b) For the purposes of calculating the principal amount of Debt Securities of any series denominated in a Foreign Currency or in units of two or more Foreign Currencies for any purpose under the Indenture, the principal amount of such Debt Securities at any time Outstanding shall be deemed to be the Dollar Equivalent of such principal amount as of the date of any such calculation.

In the event any Foreign Currency or currencies or units of two or more Currencies in which any payment with respect to any series of Debt Securities may be made ceases to be a freely convertible Currency on United States Currency markets, for any date thereafter on which payment of principal of, or premium, if any, or interest on, the Debt Securities of a series is due, the Issuer shall select the Currency of payment for use on such date, all as provided in the Debt Securities of such series. In such event, the Issuer shall, as provided in the Debt Securities of such series, notify the Trustee of the Currency which they have selected to constitute the funds necessary to meet the Issuer's obligations or such payment date and of the amount of such Currency to be paid. Such amount shall be determined as provided in the Debt Securities of such series. The payment to the Trustee with respect to such payment date shall be made by the Issuer solely in the Currency so selected.

SECTION 2.14. Wire Transfers. Notwithstanding any other provision to the contrary in the Indenture, the Issuer may make any payment of monies required to be deposited with the Trustee on account of principal of, or premium, if any, or interest on, the Debt Securities (whether pursuant to optional or mandatory redemption payments, interest payments or otherwise) by wire transfer of immediately available funds to an account designated by the Trustee by 11:00 a.m. New York City time on or before the date such moneys are to be paid to the Holders of the Debt Securities in accordance with the terms hereof.

SECTION 2.15. Securities Issuable in the Form of a Global Security. (a) If the Issuer shall establish pursuant to Sections 2.01 and 2.03 that the Debt Securities of a particular series are to be issued in whole or in part in the form of one or more Global Securities, then the Issuer shall execute and the Trustee or its agent shall, in accordance with Section 2.05, authenticate and deliver, such Global Security or Securities, which (i) shall represent, and shall be denominated in an amount equal to the aggregate principal amount of, the Outstanding Debt Securities of such series to be represented by such Global Security or Securities, or such portion thereof as the Issuer shall specify in an Officers' Certificate, (ii) shall be registered in the name of the Depositary for such Global Security or securities or its nominee, (iii) shall be delivered by the Trustee or its agent to the Depositary or pursuant to the Depositary's instruction and (iv) shall bear a legend substantially to the following effect: "Unless and until it is exchanged in whole or in part for the individual Debt Securities represented hereby, this Global Security may not be transferred except as a whole by the Depositary to a nominee of the Depositary or by a nominee of the Depositary to the Depositary or another nominee of the Depositary or by the Depositary or any such nominee to a successor Depositary or a nominee of such successor Depositary", or such other legend as may then be required by the Depositary for such Global Security or Securities.

(b) Notwithstanding any other provision of this Section 2.15 or of Section 2.07 to the contrary, and subject to the provisions of paragraph (c) below, unless the terms of a Global Security expressly

permit such Global Security to be exchanged in whole or in part for definitive Debt Securities in registered form, a Global Security may be transferred, in whole but not in part and in the manner provided in Section 2.07, only by the Depositary to a nominee of the Depositary for such Global Security, or by a nominee of the Depositary to the Depositary or another nominee of the Depositary, or by the Depositary or a nominee of the Depositary to a successor Depositary for such Global Security selected or approved by the Issuer, or to a nominee of such successor Depositary.

(c) (i) If at any time the Depositary for a Global Security or Securities notifies the Issuer that it is unwilling or unable to continue as Depositary for such Global Security or Securities or if at any time the Depositary for the Debt Securities for such series shall no longer be eligible or in good standing under the Exchange Act or other applicable statute, rule or regulation, the Issuer shall appoint a successor Depositary with respect to such Global Security or Securities. If a successor Depositary for such Global Security or Securities is not appointed by the Issuer within 90 days after the Issuer receive such notice or become aware of such ineligibility, the Issuer shall execute, and the Trustee or its agent, upon receipt of an Issuer Order for the authentication and delivery of such individual Debt Securities of such series in exchange for such Global Security, will authenticate and deliver, individual Debt Securities of such series of like tenor and terms in definitive form in an aggregate principal amount equal to the principal amount of the Global Security in exchange for such Global Security or Securities.

(ii) The Issuer may at any time and in its sole discretion determine that the Debt Securities of any series or portion thereof issued or issuable in the form of one or more Global Securities shall no longer be represented by such Global Security or Securities. In such event the Issuer will execute, and the Trustee, upon receipt of an Issuer Order for the authentication and delivery of individual Debt Securities of such series in exchange in whole or in part for such Global Security, will authenticate and deliver individual Debt Securities of such series of like tenor and terms in definitive form in an aggregate principal amount equal to the principal amount of such series or portion thereof in exchange for such Global Security or Securities.

(iii) If specified by the Issuer pursuant to Sections 2.01 and 2.03 with respect to Debt Securities issued or issuable in the form of a Global Security, the Depositary for such Global Security may surrender such Global Security in exchange in whole or in part for individual Debt Securities of such series of like tenor and terms in definitive form on such terms as are acceptable to the Issuer, the Trustee and such Depositary. Thereupon the Issuer shall execute, and the Trustee or its agent upon receipt of an Issuer Order for the authentication and delivery of definitive Debt Securities of such series shall authenticate and deliver, without service charge, (1) to each Person specified by such Depositary a new Debt Security or Securities of the same series of like tenor and terms and of any authorized denomination as requested by such Person in aggregate principal amount equal to and in exchange for such Person's beneficial interest in the Global Security, and (2) to such Depositary a new Global Security of like tenor and terms and in an authorized denomination equal to the difference, if any, between the principal amount of the surrendered Global Security and the aggregate principal amount of Debt Securities delivered to Holders thereof, unless such Global Security is endorsed by the Trustee or other custodian to reflect a reduction of such aggregate principal amount, in which case no new Global Security need be authenticated and delivered.

(iv) In any exchange provided for in any of the preceding three paragraphs, the Issuer will execute and the Trustee or its agent will authenticate and deliver individual Debt Securities. Upon the exchange of the entire principal amount of a Global Security for individual Debt Securities, such Global Security shall be canceled by the Trustee or its agent. Except as provided in the preceding paragraph, Registered Securities issued in exchange for a Global Security pursuant to this Section 2.15 shall be registered in such names and in such authorized denominations as the Depositary for such Global Security, pursuant to instructions from its direct or indirect participants or otherwise, shall instruct the Trustee or the Registrar. The Trustee or the Registrar shall deliver such Registered Securities to the Persons in whose names such Registered Securities are so registered.

(v) Payments in respect of the principal of and interest on any Debt Securities registered in the name of the Depositary or its nominee will be payable to the Depositary or such nominee in its capacity as the registered owner of such Global Security. The Issuer and the Trustee may treat the Person in whose name the Debt Securities, including the Global Security, are registered as the owner thereof for the purpose of receiving such payments and for any and all other purposes whatsoever. None of the Issuer, the Trustee, any Registrar, the paying agent or any agent of the Issuer or the Trustee will have any responsibility or liability for (a) any aspect of the records relating to or payments made on account of the beneficial ownership interests of the Global Security by the Depositary or its nominee or any of the Depositary's direct or indirect participants, or for maintaining, supervising or reviewing any records of the Depositary, its nominee or any of the Depositary's direct or indirect participants relating to the beneficial ownership interests of the Global Security, (b) the payments to the beneficial owners of the Global Security of amounts paid to the Depositary or its nominee, or (c) any other matter relating to the actions and practices of the Depositary, its nominee or any of the Depositary's direct or indirect participants. None of the Issuer, the Trustee or any such agent will be liable for any delay by the Depositary, its nominee, or any of the Depositary's direct or indirect participants in identifying the beneficial owners of the Debt Securities, and the Issuer and the Trustee may conclusively rely on, and will be protected in relying on, instructions from the Depositary or its nominee for all purposes (including with respect to the registration and delivery, and the respective principal amounts, of the Debt Securities to be issued).

SECTION 2.16. Medium Term Securities. Notwithstanding any contrary provision herein, if all Debt Securities of a series are not to be originally issued at one time, it shall not be necessary for the Issuer to deliver to the Trustee an Officers' Certificate, a Board Resolution, a supplemental Indenture, an Opinion of Counsel or a written order or any other document otherwise required pursuant to Section 2.01, 2.03, 2.05 or 12.05 at or prior to the time of authentication of each Debt Security of such series if such documents are delivered to the Trustee or its agent at or prior to the authentication upon original issuance of the first such Debt Security of such series to be issued; provided, that any subsequent request by the Issuer to the Trustee to authenticate Debt Securities of such series upon original issuance shall constitute a representation and warranty by the Issuer that, as of the date of such request, the statements made in the Officers' Certificate delivered pursuant to Section 2.05 or 12.05 shall be true and correct as if made on such date and that the Opinion of Counsel delivered at or prior to such time of authentication of an original issuance of Debt Securities shall specifically state that it shall relate to all subsequent issuances of Debt Securities of such series that are identical to the Debt Securities issued in the first issuance of Debt Securities of such series.

An Issuer Order delivered by the Issuer to the Trustee in the circumstances set forth in the preceding paragraph may provide that Debt Securities which are the subject thereof will be authenticated and delivered by the Trustee or its agent on original issue from time to time upon the written order of Persons designated in such written order and that such Persons are authorized to determine, consistent with the Officers' Certificates, supplemental Indenture or the applicable Board Resolutions relating to such written order, such terms and conditions of such Debt Securities as are specified in such Officers' Certificates, supplemental Indenture or such Board Resolutions.

SECTION 2.17. Defaulted Interest. Any interest on any Debt Security of a particular series which is payable, but is not punctually paid or duly provided for, on the dates and in the manner provided in the Debt Securities of such series and in the Indenture (herein called "Defaulted Interest") shall forthwith cease to be payable to the Registered Holder thereof on the relevant record date by virtue of having been such Registered Holder, and such Defaulted Interest may be paid by the Issuer, at its election in each case, as provided in clause (i) or (ii) below:

SECTION 2.18. Judgments. The Issuer may provide pursuant to Section 2.03 for Debt Securities of any series that (a) the obligation, if any, of the Issuer to pay the principal of, and premium, if any, and interest on, the Debt Securities of any series in a Foreign Currency or Dollars (the "Designated Currency") as may be specified pursuant to Section 2.03 is of the essence and agrees that, to the fullest extent possible under applicable law, judgments in respect of Debt Securities of such series shall be given in the Designated Currency; (b) the obligation of the Issuer to make payments in the Designated Currency of the principal of, and premium, if any, and interest on, such Debt Securities shall, notwithstanding any payment in any other Currency (whether pursuant to a judgment or otherwise), be discharged only to the extent of the amount in the Designated Currency that the Holder receiving such payment may, in accordance with normal banking procedures, purchase with the sum paid in such other Currency (after any premium and cost exchange) on the business day in the country of issue of the Designated Currency or in the international banking community (in the case of a composite currency) immediately following the day on which such Holder receives such payment; (c) if the amount in the Designated Currency that may be so purchased for any reason falls short of the amount originally due, the Issuer shall pay such additional amounts as may be necessary to compensate for such shortfall; and (d) any obligation of the Issuer not discharged by such payment shall be due as a separate and independent obligation and, until discharged as provided herein, shall continue in full force and effect.

SECTION 2.19. CUSIP Numbers. The Issuer in issuing the Debt Securities may use "CUSIP" numbers (if then generally in use), and, if so, the Trustee shall use "CUSIP" numbers in notices of redemption as a convenience to Holders; provided that any such notice may state that no representation is made as to the correctness of such numbers either as printed on the Debt Securities or as contained in any notice of a redemption and that reliance may be placed only on the other identification numbers printed on the Debt Securities, and any such redemption shall not be affected by any defect in or omission of such numbers. The Issuer will promptly notify the Trustee of any change in the "CUSIP" numbers.

SECTION 3.01. Applicability of Article. The provisions of this Article shall be applicable to the Debt Securities of any series which are redeemable before their Stated Maturity except as otherwise specified as contemplated by Section 2.03 for Debt Securities of such series.

SECTION 3.02. Notice of Redemption; Selection of Debt Securities. In case the Issuer shall desire to exercise the right to redeem all or, as the case may be, any part of the Debt Securities of any series in accordance with their terms, a Board Resolution of each Issuer or a supplemental Indenture, the Issuer shall fix a date for redemption and shall give notice of such redemption at least 30 and not more than 60 days prior to the date fixed for redemption to the Holders of Debt Securities of such series so to be redeemed as a whole or in part, in the manner provided in Section 12.03. The notice may not be conditional. The notice if given in the manner herein provided shall be conclusively presumed to have been duly given, whether or not the Holder receives such notice. In any case, failure to give such notice or any defect in the notice to the Holder of any Debt Security of a series designated for redemption as a whole or in part shall not affect the validity of the proceedings for the redemption of any other Debt Security of such series.

Each such notice of redemption shall specify the amount of Debt Securities of any series to be redeemed, the date fixed for redemption, the calculation of the redemption price at which Debt Securities of such series are to be redeemed (but not the redemption price itself if it is not then determinable), the Place or Places of Payment that payment will be made upon presentation and surrender of such Debt Securities, that any interest accrued to the date fixed for redemption will be paid as specified in said notice, that the redemption is for a sinking fund payment (if applicable), that on and after said date any interest thereon or on the portions thereof to be redeemed will cease to accrue, that in the case of Original Issue Discount Securities original issue discount accrued after the date fixed for redemption will cease to accrue, the terms of the Debt Securities of that series pursuant to which the Debt Securities of that series are being redeemed and that no representation is made as to the correctness or accuracy of the CUSIP number, if any, listed in such notice or printed on the Debt Securities of that series. If less than all the Debt Securities of a series are to be redeemed the notice of redemption shall specify the CUSIP numbers of the Debt Securities of that series to be redeemed. In case any Debt Security of a series is to be redeemed in part only, the notice of redemption shall state the portion of the principal amount thereof to be redeemed and shall state that on and after the date fixed for redemption, upon surrender of such Debt Security, a new Debt Security or Debt Securities of that series will be issued in principal amount equal to the unredeemed portion thereof.

At least 60 days before the redemption date, unless the Trustee consents to a shorter period, the Issuer shall give written notice to the Trustee of the redemption date, the principal amount of Debt Securities to be redeemed and the series and terms of the Debt Securities pursuant to which such redemption will occur. Such notice shall be accompanied by an Officers' Certificate and an Opinion of Counsel to the effect that such redemption will comply with the conditions herein. If fewer than all the Debt Securities of a series are to be redeemed, the record date relating to such redemption shall be selected by the Issuer and given to the Trustee, which record date shall be not less than 15 days after the date of notice to the Trustee.

No later than 11:00 A.M., New York City time, on the redemption date for any Debt Securities, the Issuer shall deposit with the Trustee or with a paying agent (or, if the Partnership is acting as its own paying agent, segregate and hold in trust) an amount of money in the Currency in which such Debt Securities are denominated (except as provided pursuant to Section 2.03) sufficient to pay the redemption price of such Debt Securities or any portions thereof that are to be redeemed on that date.

If less than all the Debt Securities of like tenor and terms of a series are to be redeemed (other than pursuant to mandatory sinking fund redemptions), the Trustee shall select the Debt Securities of that series or portions thereof (in multiples of $1,000) to be redeemed (i) if such Debt Securities are listed on an exchange, in compliance with the requirements of the principal national securities exchange on which such Debt Securities are listed, or (ii) if such Debt Securities are not listed on an exchange or such exchange has no selection requirements, on a pro rata basis, by lot or by such other method as in its sole discretion the Trustee shall deem appropriate and fair. In any case where more than one Debt Security of such series is registered in the same name, the Trustee in its discretion may treat the aggregate principal amount so registered as if it were represented by one Debt Security of such series. The Trustee shall promptly notify the Issuer in writing of the Debt Securities selected for redemption and, in the case of any Debt Securities selected for partial redemption, the principal amount thereof to be redeemed. If any Debt Security called for redemption shall not be so paid upon surrender thereof on such redemption date, the principal, premium, if any, and interest shall bear interest until paid from the redemption date at the rate borne by the Debt Securities of that series. If less than all the Debt Securities of unlike tenor and terms of a series are to be redeemed, the particular Debt Securities to be redeemed shall be selected by the Issuer. Provisions of the Indenture that apply to Debt Securities called for redemption also apply to portions of Debt Securities called for redemption.

SECTION 3.03. Payment of Debt Securities Called for Redemption. If notice of redemption has been given as provided in Section 3.02, the Debt Securities or portions of Debt Securities of the series with respect to which such notice has been given shall become due and payable on the date and at the Place or Places of Payment stated in such notice at the applicable redemption price, together with any interest accrued to the date fixed for redemption, and on and after said date (unless the Issuer shall default in the payment of such Debt Securities at the applicable redemption price, together with any interest accrued to said date) any interest on the Debt Securities or portions of Debt Securities of any series so called for redemption shall cease to accrue and any original issue discount in the case of Original Issue Discount Securities shall cease to accrue. On presentation and surrender of such Debt Securities at the Place or Places of Payment in said notice specified, the said Debt Securities or the specified portions thereof shall be paid and redeemed by the Issuer at the applicable redemption price, together with any interest accrued thereon to the date fixed for redemption.

Any Debt Security that is to be redeemed only in part shall be surrendered at the Corporate Trust Office of the Trustee or such other office or agency of the Issuer as is specified pursuant to Section 2.03, if the Issuer, the Registrar or the Trustee so requires, due endorsement by, or a written instrument of transfer in form satisfactory to the Issuer, the Registrar and the Trustee duly executed by, the Holder thereof or his attorney duly authorized in writing, and the Issuer shall execute, and the Trustee shall authenticate and deliver to the Holder of such Debt Security without service charge, a new Debt Security or Debt Securities of the same series, of like tenor and form, of any authorized denomination as requested by such Holder in aggregate principal amount equal to and in exchange for the unredeemed portion of the principal of the Debt Security so surrendered; except that if a Global Security is so surrendered, the Issuer shall execute, and the Trustee shall authenticate and deliver to the Depositary for such Global Security, without service charge, a new Global Security in a denomination equal to and in exchange for the unredeemed portion of the principal of the Global Security so surrendered. In the case of a Debt Security providing appropriate space for such notation, at the option of the Holder thereof, the Trustee, in lieu of delivering a new Debt Security or Debt Securities as aforesaid, may make a notation on such Debt Security of the payment of the redeemed portion thereof.

SECTION 3.04. Mandatory and Optional Sinking Funds. The minimum amount of any sinking fund payment provided for by the terms of Debt Securities of any series, a Board Resolution or a supplemental Indenture is herein referred to as a "mandatory sinking fund payment", and any payment

in excess of such minimum amount provided for by the terms of Debt Securities of any series, a Board Resolution or a supplemental Indenture is herein referred to as an "optional sinking fund payment."

In lieu of making all or any part of any mandatory sinking fund payment with respect to any Debt Securities of a series in cash, the Issuer may at its option (a) deliver to the Trustee Debt Securities of that series theretofore purchased or otherwise acquired by the Issuer or (b) receive credit for the principal amount of Debt Securities of that series which have been redeemed either at the election of the Issuer pursuant to the terms of such Debt Securities or through the application of permitted optional sinking fund payments pursuant to the terms of such Debt Securities, resolution or supplemental Indenture; provided, that such Debt Securities have not been previously so credited. Such Debt Securities shall be received and credited for such purpose by the Trustee at the redemption price specified in such Debt Securities, the applicable Board Resolution or supplemental Indenture for redemption through operation of the sinking fund and the amount of such mandatory sinking fund payment shall be reduced accordingly.

SECTION 3.05. Redemption of Debt Securities for Sinking Fund. Not less than 60 days prior to each sinking fund payment date for any series of Debt Securities, the Issuer will deliver to the Trustee an Officers' Certificate specifying the amount of the next ensuing sinking fund payment for that series pursuant to the terms of that series, any Board Resolution or supplemental Indenture, the portion thereof, if any, which is to be satisfied by payment of cash in the Currency in which the Debt Securities of such series are denominated (except as provided pursuant to Section 2.03) and the portion thereof, if any, which is to be satisfied by delivering and crediting Debt Securities of that series pursuant to this Section 3.05 (which Debt Securities, if not previously redeemed, will accompany such certificate) and whether the Issuer intends to exercise its right to make any permitted optional sinking fund payment with respect to such series. Such certificate shall also state that no Event of Default has occurred and is continuing with respect to such series. Such certificate shall be irrevocable and upon its delivery the Issuer shall be obligated to make the cash payment or payments therein referred to, if any, on or before the next succeeding sinking fund payment date. Failure of the Issuer to deliver such certificate (or to deliver the Debt Securities specified in this paragraph) shall not constitute a Default, but such failure shall require that the sinking fund payment due on the next succeeding sinking fund payment date for that series shall be paid entirely in cash and shall be sufficient to redeem the principal amount of such Debt Securities subject to a mandatory sinking fund payment without the option to deliver or credit Debt Securities as provided in this Section 3.05 and without the right to make any optional sinking fund payment, if any, with respect to such series.

Any sinking fund payment or payments (mandatory or optional) made in cash plus any unused balance of any preceding sinking fund payments made in cash which shall equal or exceed $100,000 (or a lesser sum if the Issuer shall so request) with respect to the Debt Securities of any particular series shall be applied by the Trustee on the sinking fund payment date on which such payment is made (or, if such payment is made before a sinking fund payment date, on the sinking fund payment date following the date of such payment) to the redemption of such Debt Securities at the redemption price specified in such Debt Securities, the applicable Board Resolution or supplemental Indenture for operation of the sinking fund together with any accrued interest to the date fixed for redemption. Any sinking fund moneys not so applied or allocated by the Trustee to the redemption of Debt Securities shall be added to the next cash sinking fund payment received by the Trustee for such series and, together with such payment, shall be applied in accordance with the provisions of this Section 3.05. Any and all sinking fund moneys with respect to the Debt Securities of any particular series held by the Trustee on the last sinking fund payment date with respect to Debt Securities of such series and not held for the payment or redemption of particular Debt Securities shall be applied by the Trustee, together with other moneys, if necessary, to be deposited sufficient for the purpose, to the payment of the principal of the Debt Securities of that series at its Stated Maturity.

The Trustee shall select the Debt Securities to be redeemed upon such sinking fund payment date in the manner specified in the last paragraph of Section 3.02 and the Issuer shall cause notice of the redemption thereof to be given in the manner provided in Section 3.02 except that the notice of redemption shall also state that the Debt Securities are being redeemed by operation of the sinking fund. Such notice having been duly given, the redemption of such Debt Securities shall be made upon the terms and in the manner stated in Section 3.03.

At least one business day before each sinking fund payment date, the Issuer shall pay to the Trustee (or, if the Partnership is acting as its own paying agent, the Partnership shall segregate and hold in trust) in cash a sum in the Currency in which the Debt Securities of such series are denominated (except as provided pursuant to Section 2.03) equal to any interest accrued to the date fixed for redemption of Debt Securities or portions thereof to be redeemed on such sinking fund payment date pursuant to this Section 3.05.

The Trustee shall not redeem any Debt Securities of a series with sinking fund moneys or mail any notice of redemption of such Debt Securities by operation of the sinking fund for such series during the continuance of a Default in payment of interest on such Debt Securities or of any Event of Default (other than an Event of Default occurring as a consequence of this paragraph) with respect to such Debt Securities, except that if the notice of redemption of any such Debt Securities shall theretofore have been mailed in accordance with the provisions hereof, the Trustee shall redeem such Debt Securities if cash sufficient for that purpose shall be deposited with the Trustee for that purpose in accordance with the terms of this Article III. Except as aforesaid, any moneys in the sinking fund for such series at the time when any such Default or Event of Default shall occur and any moneys thereafter paid into such sinking fund shall, during the continuance of such Default or Event of Default, be held as security for the payment of such Debt Securities; provided, however, that in case such Default or Event of Default shall have been cured or waived as provided herein, such moneys shall thereafter be applied on the next sinking fund payment date for such Debt Securities on which such moneys may be applied pursuant to the provisions of this Section 3.05.

SECTION 4.01. Payment of Principal of, and Premium, If Any, and Interest on, Debt Securities. The Issuer, for the benefit of each series of Debt Securities, will duly and punctually pay or cause to be paid the principal of, and premium, if any, and interest on, each of the Debt Securities at the place, at the respective times and in the manner provided herein and in the Debt Securities. Each installment of interest on the Debt Securities may at the Issuer's option be paid by mailing checks for such interest payable to the Person entitled thereto to the address of such Person as it appears on the Debt Security Register maintained pursuant to Section 2.07(a).

Principal, premium and interest in respect of Debt Securities of any series shall be considered paid on the date due if no later than 11:00 A.M., New York City time, on such date the Trustee or any paying agent holds in accordance with the Indenture money sufficient to pay in the Currency in which the Debt Securities of such series are denominated (except as provided pursuant to Section 2.03) all principal, premium and interest then due.

The Issuer shall pay interest on overdue principal at the rate specified therefor in the Debt Securities and they shall pay interest on overdue installments of interest at the same rate to the extent lawful.

SECTION 4.02. Maintenance of Offices or Agencies for Registration of Transfer, Exchange and Payment of Debt Securities. The Issuer will maintain in each Place of Payment for any series of Debt Securities, an office or agency where Debt Securities of such series may be presented or surrendered

for payment, where Debt Securities of such series may be surrendered for transfer or exchange and where notices and demands to or upon the Issuer in respect of the Debt Securities of such series and the Indenture may be served. The Issuer will give prompt written notice to the Trustee of the location, and any change in the location, of such office or agency. If at any time the Issuer shall fail to maintain any such required office or agency or shall fail to furnish the Trustee with the address thereof, such presentations, surrenders, notices and demands may be made or served at the Corporate Trust Office of the Trustee, and the Issuer hereby appoints the Trustee as its agent to receive all presentations, surrenders, notices and demands.

The Issuer may also from time to time designate different or additional offices or agencies to be maintained for such purposes (in or outside of such Place of Payment), and may from time to time rescind any such designation; provided, however, that no such designation or rescission shall in any manner relieve the Issuer of its obligations described in the preceding paragraph. The Issuer will give prompt written notice to the Trustee of any such additional designation or rescission of designation and any change in the location of any such different or additional office or agency.

SECTION 4.03. Appointment to Fill a Vacancy in the Office of Trustee. The Issuer, whenever necessary to avoid or fill a vacancy in the office of Trustee, will appoint, in the manner provided in Section 7.08, a Trustee, so that there shall at all times be a Trustee hereunder with respect to each series of Debt Securities.

SECTION 4.04. Duties of Paying Agents, etc. (a) The Issuer shall cause each paying agent, if any, other than the Trustee, to execute and deliver to the Trustee an instrument in which such agent shall agree with the Trustee, subject to the provisions of this Section 4.04,

(b) If the Issuer or any of its Subsidiaries shall act as its own paying agent, it will, on or before 11:00 A.M., New York City time, on each due date of the principal of, and premium, if any, or interest on, the Debt Securities if any, of any series, set aside, segregate and hold in trust for the benefit of the Holders of the Debt Securities of such series a sum sufficient to pay such principal, premium, if any, or interest so becoming due. The Issuer will promptly notify the Trustee of any failure by the Issuer or its Subsidiaries to take such action or the failure by any other obligor on such Debt Securities to make any payment of the principal of, and premium, if any, or interest on, such Debt Securities when the same shall be due and payable.

(c) Anything in this Section 4.04 to the contrary notwithstanding, the Issuer may, at any time, for the purpose of obtaining a satisfaction and discharge of the Indenture, or for any other reason, pay or cause to be paid to the Trustee all sums held in trust by it or any paying agent, as required by this Section 4.04, such sums to be held by the Trustee upon the same terms as those upon which such sums were held by the Issuer or such paying agent.

(d) Whenever the Issuer shall have one or more paying agents with respect to any series of Debt Securities, they will, prior to 11:00 A.M., New York City time, on each due date of the principal of, and premium, if any, or interest on, any Debt Securities of such series, deposit with any such paying agent a sum sufficient to pay the principal, premium or interest so becoming due, such sum to be held in trust for the benefit of the Persons entitled thereto, and (unless any such paying agent is the Trustee) the Issuer will promptly notify the Trustee of its action or failure so to act.

(e) Anything in this Section 4.04 to the contrary notwithstanding, the agreement to hold sums in trust as provided in this Section 4.04 is subject to the provisions of Section 11.02.

(f) Unless and until otherwise determined by the Issuer in Board Resolutions or pursuant to a supplemental Indenture, the Trustee will act as paying agent under the Indenture. The Issuer may designate a substitute paying agent without prior notice to the Holders of Debt Securities.

SECTION 4.05. Statement by Officers as to Default. The Issuer will deliver to the Trustee, on or before a date not more than four months after the end of each fiscal year of the Issuer (currently ending on December 31 of each year) ending after the date hereof, an Officers' Certificate stating, as to each officer signing such certificate, one of whom shall be the principal executive, financial or accounting officer of the Issuer, that (i) in the course of his performance of his duties as an officer of the General Partner he would normally have knowledge of any Default, (ii) whether or not to the best of his knowledge any Default occurred during such year and (iii) if to the best of his knowledge the Partnership is in Default, specifying all such Defaults and what action the Partnership is taking or proposes to take with respect thereto.

SECTION 4.06. Further Instruments and Acts. The Issuer will, upon request of the Trustee, execute and deliver such further instruments and do such further acts as may reasonably be necessary or proper to carry out more effectually the purposes of the Indenture.

SECTION 4.07. Corporate, Partnership or Limited Liability Company Existence. Subject to Article X, the Issuer shall do or cause to be done all things necessary to preserve and keep in full force and effect the corporate, partnership or limited liability company existence and related rights and franchises (charges and statutory) of the Partnership and each of its Subsidiaries; provided, however, that the Partnership shall not be required to preserve any such right or franchise for the corporate, partnership or limited liability company existence of any such Subsidiary if the management of the General Partner shall determine that the preservation thereof is no longer desirable in the conduct of the business of the Partnership and its Subsidiaries as a whole and that the loss thereof would not reasonably be expected to have a material adverse effect on the ability of the Issuer or any obligor on the Debt Securities of any series to perform their obligations hereunder; and provided, further, however, that the foregoing shall not prohibit a sale, transfer or conveyance of a Subsidiary of the Partnership or any of its assets in compliance with the terms of the Indenture.

SECTION 4.08. Maintenance of Properties. The Partnership shall cause all material properties owned by the Partnership or any of its Subsidiaries or used or held for use in the conduct of its business or the business of any of its Subsidiaries to be maintained and kept in good condition, repair and working order (ordinary wear and tear excepted) and supplied with all necessary equipment and will cause to be made all necessary repairs, renewals, replacements, betterments and improvements thereof, all as in the reasonable judgment of the Partnership may be consistent with sound business practice and necessary so that the business carried on in connection therewith may be properly conducted at all times; provided, however, that nothing in this Section shall prevent the Partnership from discontinuing the maintenance of any of such properties if such discontinuance is, in the reasonable judgment of the management of the General Partner, desirable in the conduct of its business or the business of any of its Subsidiaries and not reasonably expected to have a material adverse effect on the ability of the Issuer or any obligor on the Debt Securities of any series to perform their obligations hereunder.

SECTION 4.09. Payment of Taxes and Other Claims. The Partnership shall pay or discharge or cause to be paid or discharged, on or before the date the same shall become due and payable, (a) all taxes, assessments and governmental charges levied or imposed upon the Partnership or any of its Subsidiaries or otherwise assessed or upon the income, profits or property of the Partnership or any of its Subsidiaries if failure to pay or discharge the same could reasonably be expected to have a material adverse effect on the ability of the Issuer or any obligor on the Debt Securities of any series to perform their obligations hereunder and (b) all lawful claims for labor, materials and supplies, which, if unpaid, would by law become a Lien upon the property of the Partnership or any of its Subsidiaries, except for any Lien permitted to be incurred under the terms of the Indenture, if failure to pay or discharge the same could reasonably be expected to have a material adverse effect on the ability of the Issuer or any obligor on the Debt Securities of any series to perform their obligations hereunder; provided, however, that the Partnership shall not be required to pay or discharge or cause to be paid or discharged any such tax, assessment, charge or claim whose amount, applicability or validity is being contested in good faith by appropriate proceedings properly instituted and diligently conducted and in respect of which appropriate reserves (in the good faith judgment of management of the General Partner) are being maintained in accordance with GAAP.

SECTION 4.10. Calculation of Original Issue Discount. The Issuer shall file with the Trustee promptly at the end of each calendar year (i) a written notice specifying the amount of original issue discount (including daily rates and accrual periods) accrued on Outstanding Original Issue Discount Debt Securities as of the end of such year and (ii) such other specific information relating to such original issue discount as may then be relevant under the Code.

SECTION 4.11. Stay, Extension and Usury Laws. The Issuer covenants (to the extent that it may lawfully do so) that it shall not at any time insist upon, plead or in any manner whatsoever claim or take the benefit or advantage of, any stay, extension or usury law wherever enacted, now or at any time hereafter in force, that may affect the covenants or the performance of the Indenture; and the Issuer hereby expressly waives all benefit or advantage of any such law, and covenants that it shall not, by resort to any such law, hinder, delay or impede the execution of any power herein granted to the Trustee, but shall suffer and permit the execution of every such power as though no such law has been enacted.

SECTION 5.01. Issuer to Furnish Trustee Information as to Names and Addresses of Holders; Preservation of Information. The Issuer covenants and agrees that it will furnish or cause to be furnished to the Trustee with respect to the Registered Securities of each series:

provided, however, that so long as the Trustee shall be the Registrar, such lists shall not be required to be furnished.

The Trustee shall preserve, in as current a form as is reasonably practicable, all information as to the names and addresses of the Holders (1) contained in the most recent list furnished to it as

provided in this Section 5.01 or (2) received by it in the capacity of paying agent or Registrar (if so acting) hereunder.

The Trustee may destroy any list furnished to it as provided in this Section 5.01 upon receipt of a new list so furnished.

SECTION 5.02. Communications to Holders; Meetings of Holders. (a) Holders may communicate pursuant to Section 312(b) of the Trust Indenture Act with other Holders with respect to their rights under the Indenture or the Debt Securities. The Issuer, the Trustee, the Registrar and anyone else shall have the protection of Section 312(c) of the Trust Indenture Act.

(b) A meeting of the Holders of Debt Securities of any or all series may be called at any time and from time to time pursuant to this Section 5.02 to make, give or take any request, demand, authorization, direction, notice, consent, waiver or other action provided herein to be made, given or taken by Holders of Debt Securities of such series.

(c) The Trustee may at any time call a meeting of Holders of Debt Securities of any series for any purpose specified herein to be held at such time and at such place in Englewood, Colorado, in The Borough of Manhattan, The City of New York or in any other location, as the Trustee shall determine. Notice of every meeting of Holders of any series, setting forth the time and the place of such meeting and in general terms the action proposed to be taken at such meeting, shall be given not less than 20 nor more than 180 days prior to the date fixed for the meeting.

(d) In case at any time the Issuer, pursuant to Board Resolutions, or the Holders of at least 10% in aggregate principal amount of the outstanding Debt Securities of any series, shall have requested the Trustee for any such series to call a meeting of the Holders of Debt Securities of such series for any purpose specified herein, by written request setting forth in reasonable detail the action proposed to be taken at the meeting, and the Trustee shall not have made the first publication of the notice of such meeting within 30 days after receipt of such request or shall not thereafter proceed to cause the meeting to be held as provided herein, then the Issuer or the Holders of such series in the amount specified above, as the case may be, may determine the time and the place in Englewood, Colorado, in The Borough of Manhattan, The City of New York, or in any other location, for such meeting and may call such meeting for such purposes by giving notice thereof as provided in paragraph (c) of this Section 5.02.

SECTION 5.03. Reports by Issuer. (a) Notwithstanding that the Partnership may not be required to remain subject to the reporting requirements of Section 13 or 15(d) of the Exchange Act, the Partnership shall file with the Commission and provide to the Trustee and the Holders of Debt Securities the annual reports and the information, documents and other reports that are specified in Sections 13 and 15(d) of the Exchange Act, and, with respect to the annual consolidated financial statements only, a report thereon by the Issuer's independent auditors; provided, however, that the Partnership shall not be so obligated to file such information, documents and reports with the Commission if the Commission does not permit such filings. The Issuer shall comply with the other provisions of Section 314(a) of the Trust Indenture Act.

(b) The Issuer covenants and agrees, and any obligor hereunder shall covenant and agree, to file with the Trustee and the Commission, in accordance with the rules and regulations prescribed from time to time by said Commission, such additional information, documents, and reports with respect to compliance by the Issuer or such obligor, as the case may be, with the conditions and covenants provided for in the Indenture as may be required from time to time by such rules and regulations.

(c) Delivery of such reports, information and documents to the Trustee is for informational purposes only and the Trustee's receipt of such shall not constitute notice of any information contained therein or determinable from information contained therein, including the Issuer's compliance with any

of its covenants hereunder (as to which the Trustee is entitled to rely exclusively on Officers' Certificates).

SECTION 5.04. Reports by Trustee. The Trustee shall transmit to Holders such reports concerning the Trustee and its actions under the Indenture as may be required pursuant to the Trust Indenture Act at the time and in the manner provided pursuant thereto.

A copy of each report at the time of its mailing to Holders shall be filed with the Commission and each stock exchange (if any) on which the Debt Securities of any series are listed. The Issuer agrees to notify promptly the Trustee whenever the Debt Securities of any series become listed on any stock exchange and of any delisting thereof.

SECTION 5.05. Record Dates for Action by Holders. If the Issuer shall solicit from the Holders of Debt Securities of any series any action (including the making of any demand or request, the giving of any direction, notice, consent or waiver or the taking of any other action), the Issuer may, at its option, by Board Resolutions, fix in advance a record date for the determination of Holders of Debt Securities entitled to take such action, but the Issuer shall have no obligation to do so. Any such record date shall be fixed at the Issuer's discretion. If such a record date is fixed, such action may be sought or given before or after the record date, but only the Holders of Debt Securities of record at the close of business on such record date shall be deemed to be Holders of Debt Securities for the purpose of determining whether Holders of the requisite proportion of Debt Securities of such series Outstanding have authorized or agreed or consented to such action, and for that purpose the Debt Securities of such series Outstanding shall be computed as of such record date.

SECTION 6.01. Events of Default. If any one or more of the following shall have occurred and be continuing with respect to Debt Securities of any series (each of the following, an "Event of Default"):

then and in each and every case that an Event of Default with respect to Debt Securities of that series at the time outstanding occurs and is continuing, either the Trustee or the Holders of at least 25% in aggregate principal amount of the Debt Securities of that series, may declare the principal of (or, if the Debt Securities of that series are Original Issue Discount Debt Securities, such portion of the principal amount as may be specified in the terms of that series) and interest on all the Debt Securities of that series to be due and payable immediately.

The Holders of a majority in principal amount of the Debt Securities of a particular series by notice to the Trustee may rescind an acceleration and its consequences if the rescission would not conflict with any judgment or decree already rendered and if all existing Events of Default have been cured or waived except nonpayment of principal or interest that has become due solely because of acceleration. Upon any such rescission, the parties hereto shall be restored respectively to their several positions and rights hereunder, and all rights, remedies and powers of the parties hereto shall continue as though no proceeding had been taken.

In case the Trustee or any Holder shall have proceeded to enforce any right under the Indenture and such proceedings shall have been discontinued or abandoned because of such rescission or annulment or for any other reason or shall have been determined adversely to the Trustee or such Holder, then and in every such case the parties hereto shall be restored respectively to their several positions and rights hereunder, and all rights, remedies and powers of the parties hereto shall continue as though no such proceeding had been taken.

The foregoing Events of Default shall constitute Events of Default whatever the reason for any such Event of Default and whether it is voluntary or involuntary or is effected by operation of law or pursuant to any judgment, decree or order of any court or any order, rule or regulation of any administrative or governmental body.

The Issuer shall deliver to the Trustee, within 30 days after the occurrence thereof, written notice in the form of an Officers' Certificate of any event which with the giving of notice and the lapse of time would become an Event of Default under clause (c), (d), (e), (f), (g) or (h), its status and what action the Issuer is taking or proposes to take with respect thereto.

SECTION 6.02. Collection of Indebtedness by Trustee, etc. If an Event of Default occurs and is continuing, the Trustee, in its own name and as trustee of an express trust, shall be entitled and empowered to institute any action or proceedings at law or in equity for the collection of the sums so due and unpaid or enforce the performance of any provision of the Debt Securities of the affected series or the Indenture, and may prosecute any such action or proceedings to judgment or final decree, and may enforce any such judgment or final decree against the Issuer or any other obligor upon the Debt Securities of such series (and collect in the manner provided by law out of the property of the

Issuer or any other obligor upon the Debt Securities of such series wherever situated the moneys adjudged or decreed to be payable).

In case there shall be pending proceedings for the bankruptcy or for the reorganization the Issuer or any other obligor upon the Debt Securities of any series under Title 11 of the United States Code or any other Federal or State bankruptcy, insolvency or similar law, or in case a receiver, trustee or other similar official shall have been appointed for its property, or in case of any other similar judicial proceedings relative to the Issuer or any other obligor upon the Debt Securities of any series, its creditors or its property, the Trustee, irrespective of whether the principal of Debt Securities of any series shall then be due and payable as therein expressed or by declaration or otherwise and irrespective of whether the Trustee shall have made any demand pursuant to the provisions of this Section 6.02, shall be entitled and empowered, by intervention in such proceedings or otherwise, to file and prove a claim or claims for the whole amount of principal, premium, if any, and interest (or, if the Debt Securities of such series are Original Issue Discount Debt Securities, such portion of the principal amount as may be specified in the terms of such series) owing and unpaid in respect of the Debt Securities of such series, and to file such other papers or documents as may be necessary or advisable in order to have the claims of the Trustee (including any claim for reasonable compensation to the Trustee, its agents, attorneys and counsel, and for reimbursement of all expenses and liabilities incurred, and all advances made, by the Trustee except as a result of its negligence or bad faith) and of the Holders thereof allowed in any such judicial proceedings relative to the Issuer, or any other obligor upon the Debt Securities of such series, its creditors or its property, and to collect and receive any moneys or other property payable or deliverable on any such claims, and to distribute all amounts received with respect to the claims of such Holders and of the Trustee on their behalf, and any receiver, assignee or trustee in bankruptcy or reorganization is hereby authorized by each of such Holders to make payments to the Trustee, and, in the event that the Trustee shall consent to the making of payments directly to such Holders, to pay to the Trustee such amount as shall be sufficient to cover reasonable compensation to the Trustee, its agents, attorneys and counsel, and all other reasonable expenses and liabilities incurred, and all advances made, by the Trustee except as a result of its negligence or bad faith.

All rights of action and of asserting claims under the Indenture, or under any of the Debt Securities, of any series, may be enforced by the Trustee without the possession of any such Debt Securities or the production thereof in any trial or other proceedings relative thereto, and any such action or proceedings instituted by the Trustee shall be brought in its own name as trustee of an express trust, and any recovery of judgment (except for any amounts payable to the Trustee pursuant to Section 7.06) shall be for the ratable benefit of the Holders of all the Debt Securities in respect of which such action was taken.

In case of an Event of Default hereunder the Trustee may in its discretion proceed to protect and enforce the rights vested in it by the Indenture by such appropriate judicial proceedings as the Trustee shall deem necessary to protect and enforce any of such rights, either at law or in equity or in bankruptcy or otherwise, whether for the specific enforcement of any covenant or agreement contained in the Indenture or in aid of the exercise of any power granted in the Indenture, or to enforce any other legal or equitable right vested in the Trustee by the Indenture or by law.

SECTION 6.03. Application of Moneys Collected by Trustee. Any moneys or other property collected by the Trustee pursuant to Section 6.02 with respect to Debt Securities of any series shall be applied, in the order following, at the date or dates fixed by the Trustee for the distribution of such moneys or other property, upon presentation of the several Debt Securities of such series in respect of

which moneys or other property have been collected, and the notation thereon of the payment, if only partially paid, and upon surrender thereof if fully paid:

The Trustee may fix a record date and payment date for any payment to Holders pursuant to this Section 6.03. At least 15 days before such record date, the Issuer shall mail to each Holder and the Trustee a notice that states the record date, the payment date and amount to be paid.

SECTION 6.04. Limitation on Suits by Holders. No Holder of any Debt Security of any series shall have any right by virtue or by availing of any provision of the Indenture to institute any action or proceeding at law or in equity or in bankruptcy or otherwise, upon or under or with respect to the Indenture, or for the appointment of a receiver or trustee, or for any other remedy hereunder, unless such Holder previously shall have given to the Trustee written notice of an Event of Default with respect to Debt Securities of that same series and of the continuance thereof and unless the Holders of not less than 25% in aggregate principal amount of the Outstanding Debt Securities of that series shall have made written request upon the Trustee to institute such action or proceedings in respect of such Event of Default in its own name as Trustee hereunder and shall have offered to the Trustee such reasonable indemnity as it may require against the costs, expenses and liabilities to be incurred therein or thereby, and the Trustee, for 60 days after its receipt of such notice, request and offer of indemnity shall have failed to institute any such action or proceedings and no direction inconsistent with such written request shall have been given to the Trustee pursuant to Section 6.06; it being understood and intended, and being expressly covenanted by the Holder of every Debt Security with every other Holder and the Trustee, that no one or more Holders shall have any right in any manner whatever by virtue or by availing of any provision of the Indenture to affect, disturb or prejudice the rights of any Holders, or

to obtain or seek to obtain priority over or preference to any other such Holder, or to enforce any right under the Indenture, except in the manner herein provided and for the equal, ratable and common benefit of all such Holders. For the protection and enforcement of the provisions of this Section 6.04, each and every Holder and the Trustee shall be entitled to such relief as can be given either at law or in equity.

Notwithstanding any other provision in the Indenture, however, the right of any Holder of any Debt Security to receive payment of the principal of, and premium, if any, and (subject to Section 2.12) interest on, such Debt Security on or after the respective due dates expressed in such Debt Security, and to institute suit for the enforcement of any such payment on or after such respective dates, shall not be impaired or effected without the consent of such Holder.

SECTION 6.05. Remedies Cumulative; Delay or Omission in Exercise of Rights Not a Waiver of Default. All powers and remedies given by this Article VI to the Trustee or to the Holders shall, to the extent permitted by law, be deemed cumulative and not exclusive of any thereof or of any other powers and remedies available to the Trustee or the Holders, by judicial proceedings or otherwise, to enforce the performance or observance of the covenants and agreements contained in the Indenture, and no delay or omission of the Trustee or of any Holder to exercise any right or power accruing upon any Default occurring and continuing as aforesaid, shall impair any such right or power, or shall be construed to be a waiver of any such Default or an acquiescence therein; and, subject to the provisions of Section 6.04, every power and remedy given by this Article VI or by law to the Trustee or to the Holders may be exercised from time to time, and as often as shall be deemed expedient, by the Trustee or by the Holders.

SECTION 6.06. Rights of Holders of Majority in Principal Amount of Debt Securities to Direct Trustee and to Waive Default. The Holders of a majority in aggregate principal amount of the Debt Securities of any series at the time Outstanding shall have the right to direct the time, method, and place of conducting any proceeding for any remedy available to the Trustee, or exercising any trust or power conferred on the Trustee, with respect to the Debt Securities of such series; provided, however, that such direction shall not be otherwise than in accordance with law and the provisions of the Indenture, and that subject to the provisions of Section 7.01, the Trustee shall have the right to decline to follow any such direction if the Trustee being advised by counsel shall determine that the action so directed may not lawfully be taken, or if the Trustee shall by a Responsible Officer or officers determine that the action so directed would involve it in personal liability or would be prejudicial to Holders of Debt Securities of such series not taking part in such direction; and provided further, however, that nothing in the Indenture contained shall impair the right of the Trustee to take any action deemed proper by the Trustee and which is not inconsistent with such direction by such Holders. Prior to the acceleration of the maturity of the Debt Securities of any series, as provided in Section 6.01, the Holders of a majority in aggregate principal amount of the Debt Securities of that series at the time Outstanding by notice to the Trustee may on behalf of the Holders of all the Debt Securities of that series waive any past Default or Event of Default and its consequences for that series specified in the terms thereof as contemplated by Section 2.03, except (i) a Default in the payment of the principal of, and premium, if any, or interest on, any of the Debt Securities and (ii) a Default in respect of a provision that under Section 9.02 cannot be amended, supplemented or waived without the consent of each Holder affected thereby. In case of any such waiver, such Default shall cease to exist, any Event of Default arising therefrom shall be deemed to have been cured for every purpose of the Indenture, and the Issuer, the Trustee and the Holders of the Debt Securities of that series shall be restored to their former positions and rights hereunder, respectively; but no such waiver shall extend to any subsequent or other Default or impair any right consequent thereon.

SECTION 6.07. Trustee to Give Notice of Defaults Known to It, but May Withhold Such Notice in Certain Circumstances. The Trustee shall, within 90 days after the occurrence of a Default known to it with respect to a series of Debt Securities give to the Holders thereof, in the manner provided in

Section 12.03, notice of all Defaults with respect to such series known to the Trustee, unless such Defaults shall have been cured or waived before the giving of such notice; provided that, except in the case of Default in the payment of the principal of, or premium, if any, or interest on, any of the Debt Securities of such series or in the making of any sinking fund payment with respect to the Debt Securities of such series, the Trustee shall be protected in withholding such notice if and so long as the committee of Responsible Officers of the Trustee in good faith determine that the withholding of such notice is in the interests of the Holders thereof.

SECTION 6.08. Requirement of an Undertaking To Pay Costs in Certain Suits under the Indenture or Against the Trustee. All parties to the Indenture agree, and each Holder of any Debt Security by his acceptance thereof shall be deemed to have agreed, that any court may in its discretion require, in any suit for the enforcement of any right or remedy under the Indenture, or in any suit against the Trustee for any action taken or omitted by it as Trustee, the filing by any party litigant in such suit of an undertaking to pay the costs of such suit in the manner and to the extent provided in the Trust Indenture Act, and that such court may in its discretion assess reasonable costs, including reasonable attorneys' fees and expenses, against any party litigant in such suit, having due regard to the merits and good faith of the claims or defenses made by such party litigant; but the provisions of this Section 6.08 shall not apply to any suit instituted by the Trustee, to any suit instituted by any Holder, or group of Holders, holding in the aggregate more than ten percent in principal amount of the Outstanding Debt Securities of that series or to any suit instituted by any Holder for the enforcement of the payment of the principal of, or premium, if any, or interest on, any Debt Security on or after the due date for such payment expressed in such Debt Security.

SECTION 7.01. Certain Duties and Responsibilities. The Trustee, prior to the occurrence of an Event of Default and after the curing or waiving of all Events of Default which may have occurred, undertakes to perform such duties and only such duties as are specifically set forth in the Indenture. In case an Event of Default has occurred (which has not been cured or waived), the Trustee shall exercise such of the rights and powers vested in it by the Indenture, and use the same degree of care and skill in their exercise, as a prudent person would exercise or use under the circumstances in the conduct of his own affairs.

No provision of the Indenture shall be construed to relieve the Trustee from liability for its own negligent action, its own negligent failure to act, or its own willful misconduct, except that:

None of the provisions of the Indenture shall require the Trustee to expend or risk its own funds or otherwise incur any personal financial liability in the performance of any of its duties hereunder, or in the exercise of any of its rights or powers, if there shall be reasonable grounds for believing that repayment of such funds or adequate indemnity against such risk or liability is not reasonably assured to it.

Whether or not therein expressly so provided, every provision of the Indenture relating to the conduct or affecting the liability of or affording protection to the Trustee shall be subject to the provisions of this Section.

SECTION 7.02. Certain Rights of Trustee. Except as otherwise provided in Section 7.01:

SECTION 7.03. Trustee Not Liable for Recitals in Indenture or in Debt Securities. The recitals contained herein and in the Debt Securities (except the Trustee's certificate of authentication) shall be taken as the statements of the Issuer, and the Trustee assumes no responsibility for the correctness of the same. The Trustee makes no representations as to the validity or sufficiency of the Indenture or of the Debt Securities of any series, except that the Trustee represents that it is duly authorized to execute and deliver the Indenture, authenticate the Debt Securities and perform its obligations hereunder, and that the statements made by it or to be made by it in a Statement of Eligibility and Qualification on Form T-1 supplied to the Issuer are true and accurate. The Trustee shall not be accountable for the use or application by the Issuer of any of the Debt Securities or of the proceeds thereof.

SECTION 7.04. Trustee, Paying Agent or Registrar May Own Debt Securities. The Trustee or any paying agent or Registrar, in its individual or any other capacity, may become the owner or pledgee of Debt Securities and subject to the provisions of the Trust Indenture Act relating to conflicts of interest and preferential claims may otherwise deal with the Issuer with the same rights it would have if it were not Trustee, paying agent or Registrar; provided, however, that if the Trustee acquires any such

conflicting interest and an Event of Default or Default has occurred and is continuing, the Trustee must eliminate such conflict within 90 days, apply to the Commission for permission to continue as trustee or resign.

SECTION 7.05. Moneys Received by Trustee to Be Held in Trust. Subject to the provisions of Section 11.02, all moneys received by the Trustee shall, until used or applied as herein provided, be held in trust for the purposes for which they were received, but need not be segregated from other funds except to the extent required by law. The Trustee shall be under no liability for interest on any moneys received by it hereunder. So long as no Event of Default shall have occurred and be continuing, all interest allowed on any such moneys shall be paid from time to time to the Issuer upon an Issuer Order.

SECTION 7.06. Compensation and Reimbursement. The Issuer covenants and agrees to pay in Dollars to the Trustee from time to time, and the Trustee shall be entitled to, reasonable compensation for all services rendered by it hereunder (which shall not be limited by any provision of law in regard to the compensation of a trustee of an express trust), and, except as otherwise expressly provided herein, the Issuer will pay or reimburse in Dollars the Trustee upon its request for all expenses, disbursements and advances incurred or made by the Trustee in accordance with any of the provisions of the Indenture (including the reasonable compensation and the expenses and disbursements of its agents, attorneys and counsel and of all Persons not regularly in its employ) except any such expense, disbursement or advances as may arise from its negligence or bad faith. The Issuer also covenants to fully indemnify in Dollars the Trustee and any predecessor Trustee for, and to hold it harmless against, any and all loss, liability, claim, damage or expense incurred without negligence or willful misconduct on the part of the Trustee, arising out of or in connection with the acceptance or administration of this trust or trusts hereunder, including the costs and expenses of defending itself against any claim of liability in connection with the exercise or performance of any of its powers or duties hereunder. The obligations of the Issuer under this Section 7.06 to compensate and indemnify the Trustee and to pay or reimburse the Trustee for expenses, disbursements and advances shall constitute additional indebtedness hereunder and shall survive the satisfaction and discharge of the Indenture. The Issuer and the Holders agree that such additional indebtedness shall be secured by a Lien prior to that of the Debt Securities upon all property and funds held or collected by the Trustee, as such, except funds held in trust for the payment of principal of, and premium, if any, or interest on, particular Debt Securities.

When the Trustee incurs expenses or renders services after an Event of Default specified in Section 6.01(g) or (h) occurs, the expenses and the compensation for the services are intended to constitute expenses of administration under any bankruptcy, insolvency, reorganization or other similar law.

SECTION 7.07. Right of Trustee to Rely on an Officers' Certificate Where No Other Evidence Specifically Prescribed. Except as otherwise provided in Section 7.01, whenever in the administration of the provisions of the Indenture the Trustee shall deem it necessary or desirable that a matter be proved or established prior to taking or suffering or omitting any action hereunder, such matter (unless other evidence in respect thereof be herein specifically prescribed) may, in the absence of negligence or bad faith on the part of the Trustee, be deemed to be conclusively proved and established by an Officers' Certificate delivered to the Trustee and such certificate, in the absence of negligence or bad faith on the part of the Trustee, shall be full warrant to the Trustee for any action taken, suffered or omitted by it under the provisions of the Indenture upon the faith thereof.

SECTION 7.08. Separate Trustee; Replacement of Trustee. The Issuer may, but need not, appoint a separate Trustee for any one or more series of Debt Securities. The Trustee may resign with respect to one or more or all series of Debt Securities at any time by giving notice to the Issuer. The Holders of a majority in principal amount of the Debt Securities of a particular series may remove the Trustee

for such series and only such series by so notifying the Trustee and may appoint a successor Trustee. The Issuer shall remove the Trustee if:

If the Trustee resigns, is removed by the Issuer or by the Holders of a majority in principal amount of the Debt Securities of a particular series and such Holders do not reasonably promptly appoint a successor Trustee, or if a vacancy exists in the office of Trustee for any reason (the Trustee in such event being referred to herein as the retiring Trustee), the Issuer shall promptly appoint a successor Trustee. No resignation or removal of the Trustee and no appointment of a successor Trustee shall become effective until the acceptance of appointment by the successor Trustee in accordance with the applicable requirements of this Section 7.08.

A successor Trustee shall deliver a written acceptance of its appointment to the retiring Trustee and to the Issuer. Thereupon the resignation or removal of the retiring Trustee shall become effective, and the successor Trustee shall have all the rights, powers and duties of the Trustee under the Indenture. The successor Trustee shall mail a notice of its succession to Holders of Debt Securities of each applicable series. The retiring Trustee shall promptly transfer all property held by it as Trustee to the successor Trustee, subject to the Lien provided for in Section 7.06.

If a successor Trustee does not take office within 60 days after the retiring Trustee gives notice of resignation or is removed, the retiring Trustee or the Holders of 25% in principal amount of the Debt Securities of any applicable series may petition any court of competent jurisdiction for the appointment of a successor Trustee for the Debt Securities of such series.

If the Trustee fails to comply with Section 7.10, any Holder of Debt Securities of any applicable series may petition at the expense of the Issuer any court of competent jurisdiction for the removal of the Trustee and the appointment of a successor Trustee for the Debt Securities of such series.

Notwithstanding the replacement of the Trustee pursuant to this Section 7.08, the Issuer's obligations under Section 7.06 shall continue for the benefit of the retiring Trustee.

In the case of the appointment hereunder of a separate or successor Trustee with respect to the Debt Securities of one or more series, the Issuer, any retiring Trustee and each successor or separate Trustee with respect to the Debt Securities of any applicable series shall execute and deliver an Indenture supplemental hereto (1) which shall contain such provisions as shall be deemed necessary or desirable to confirm that all the rights, powers, trusts and duties of any retiring Trustee with respect to the Debt Securities of any series as to which any such retiring Trustee is not retiring shall continue to be vested in such retiring Trustee and (2) that shall add to or change any of the provisions of the Indenture as shall be necessary to provide for or facilitate the administration of the trusts hereunder by more than one trustee, it being understood that nothing herein or in such supplemental Indenture shall constitute such Trustees co-trustees of the same trust and that each such separate, retiring or successor Trustee shall be Trustee of a trust or trusts hereunder separate and apart from any trust or trusts hereunder administered by any other such Trustee.

SECTION 7.09. Successor Trustee by Merger. If the Trustee consolidates with, merges or converts into, or transfers all or substantially all of its corporate trust business or assets to, another corporation or banking association, the resulting, surviving or transferee corporation or banking association without any further act shall be the successor Trustee, provided such Person shall be otherwise qualified and eligible under this Article VII, without the execution or filing of any paper or any further act on the

part of any of the parties hereto. As soon as practicable, the successor Trustee shall mail a notice of its succession to the Issuer and the Holders of the Debt Securities then Outstanding.

In case at the time such successor or successors by merger, conversion or consolidation to the Trustee shall succeed to the trusts created by the Indenture any of the Debt Securities shall have been authenticated but not delivered, any such successor to the Trustee may adopt the certificate of authentication of any predecessor trustee, and deliver such Debt Securities so authenticated; and in case at that time any of the Debt Securities shall not have been authenticated, any successor to the Trustee may authenticate such Debt Securities either in the name of any predecessor hereunder or in the name of the successor to the Trustee; and in all such cases such certificates shall have the full force which it is anywhere in the Debt Securities or in the Indenture provided that the certificate of the Trustee shall have.

SECTION 7.10. Eligibility; Disqualification. The Trustee shall at all times satisfy the requirements of Section 310(a) of the Trust Indenture Act. The Trustee shall have a combined capital and surplus of at least $50,000,000, as set forth in its most recently published annual report of condition. No obligor upon the Debt Securities of a particular series or Person directly or indirectly controlling, controlled by or under common control with such obligor shall serve as Trustee upon the Debt Securities of such series. The Trustee shall comply with Section 310(b) of the Trust Indenture Act; provided, however, that there shall be excluded from the operation of Section 310(b)(1) of the Trust Indenture Act the Indenture or any indenture or indentures under which other securities or certificates of interest or participation in other securities of the Issuer are outstanding if the requirements for such exclusion set forth in Section 310(b)(1) of the Trust Indenture Act are met.

SECTION 7.11. Preferential Collection of Claims Against Issuer. The Trustee shall comply with Section 311(a) of the Trust Indenture Act, excluding any creditor relationship listed in Section 311(b) of the Trust Indenture Act. A Trustee who had resigned or been removed shall be subject to Section 311(a) of the Trust Indenture Act to the extent indicated therein.

SECTION 7.12. Compliance with Tax Laws. The Trustee hereby agrees to comply with all U.S. Federal income tax information reporting and withholding requirements applicable to it with respect to payments of principal, premium (if any) and interest on the Debt Securities, whether acting as Trustee, Security Registrar, paying agent or otherwise with respect to the Debt Securities.

SECTION 8.01. Evidence of Action by Holders. Whenever in the Indenture it is provided that the Holders of a specified percentage in aggregate principal amount of the Debt Securities of any or all series may take action (including the making of any demand or request, the giving of any direction, notice, consent or waiver or the taking of any other action) the fact that at the time of taking any such action the Holders of such specified percentage have joined therein may be evidenced (a) by any instrument or any number of instruments of similar tenor executed by Holders in person or by agent or proxy appointed in writing, (b) by the record of the Holders voting in favor thereof at any meeting of Holders duly called and held in accordance with the provisions of Section 5.02 or (c) by a combination of such instrument or instruments and any such record of such a meeting of Holders.

SECTION 8.02. Proof of Execution of Instruments and of Holding of Debt Securities. Subject to the provisions of Sections 7.01, 7.02 and 12.09, proof of the execution of any instrument by a Holder or his agent or proxy shall be sufficient if made in accordance with such reasonable rules and regulations as may be prescribed by the Trustee or in such manner as shall be satisfactory to the Trustee.

The ownership of Registered Securities of any series shall be proved by the Debt Security Register or by a certificate of the Registrar for such series.

The Trustee may require such additional proof of any matter referred to in this Section 8.02 as it shall deem necessary.

SECTION 8.03. Who May Be Deemed Owner of Debt Securities. Prior to due presentment for registration of transfer of any Registered Security, the Issuer, the Trustee, any paying agent and any Registrar may deem and treat the Person in whose name any Registered Security shall be registered upon the books of the Issuer as the absolute owner of such Registered Security (whether or not such Registered Security shall be overdue and notwithstanding any notation of ownership or other writing thereon) for the purpose of receiving payment of or on account of the principal of and premium, if any, and (subject to Section 2.12) interest on such Registered Security and for all other purposes, and neither the Issuer nor the Trustee nor any paying agent nor any Registrar shall be affected by any notice to the contrary; and all such payments so made to any such Holder for the time being, or upon his order, shall be valid and, to the extent of the sum or sums so paid, effectual to satisfy and discharge the liability for moneys payable upon any such Registered Security.

SECTION 8.04. Instruments Executed by Holders Bind Future Holders. At any time prior to (but not after) the evidencing to the Trustee, as provided in Section 8.01, of the taking of any action by the Holders of the percentage in aggregate principal amount of the Debt Securities of any series specified in the Indenture in connection with such action and subject to the following paragraph, any Holder of a Debt Security which is shown by the evidence to be included in the Debt Securities the Holders of which have consented to such action may, by filing written notice with the Trustee at its Corporate Trust Office of the Trustee and upon proof of holding as provided in Section 8.02, revoke such action so far as concerns such Debt Security. Except as aforesaid any such action taken by the Holder of any Debt Security shall be conclusive and binding upon such Holder and upon all future Holders and owners of such Debt Security and of any Debt Security issued upon transfer thereof or in exchange or substitution therefor, irrespective of whether or not any notation in regard thereto is made upon such Debt Security or such other Debt Securities. Any action taken by the Holders of the percentage in aggregate principal amount of the Debt Securities of any series specified in the Indenture in connection with such action shall be conclusively binding upon the Issuer, the Trustee and the Holders of all the Debt Securities of such series.

The Issuer may, but shall not be obligated to, fix a record date for the purpose of determining the Holders of Registered Securities entitled to give their consent or take any other action required or permitted to be taken pursuant to the Indenture. If a record date is fixed, then notwithstanding the immediately preceding paragraph, those Persons who were Holders of Registered Securities at such record date (or their duly designated proxies), and only those Persons, shall be entitled to give such consent or to revoke any consent previously given or to take any such action, whether or not such Persons continue to be Holders of Registered Securities after such record date. No such consent shall be valid or effective for more than 120 days after such record date unless the written consent of the Holders of the percentage in aggregate principal amount of the Debt Securities of such series specified in the Indenture shall have been received within such 120-day period.

SECTION 9.01. Without Consent of Holders of Debt Securities. The Issuer and the Trustee may from time to time and at any time, without the consent of Holders, enter into an Indenture or Indentures supplemental hereto (which shall conform to the provisions of the Trust Indenture Act as in force at the date of the execution thereof) for one or more of the following purposes:

The Trustee is hereby authorized to join with the Issuer and guarantors with respect to any Debt Securities in the execution of any such supplemental Indenture, to make any further appropriate agreements and stipulations which may be therein contained and to accept the conveyance, transfer, assignment, mortgage or pledge of any property thereunder, but the Trustee shall not be obligated to enter into any such supplemental Indenture which affects the Trustee's own rights, duties or immunities under the Indenture or otherwise.

Any supplemental Indenture authorized by the provisions of this Section 9.01 may be executed by the Issuer, any guarantors with respect to any Debt Securities and the Trustee without the consent of the Holders of any of the Debt Securities at the time outstanding, notwithstanding any of the provisions of Section 9.02.

After an amendment under this Section 9.01 becomes effective, the Issuer shall mail to Holders of Debt Securities of each series affected thereby a notice briefly describing such amendment. The failure to give such notice to all such Holders, or any defect therein, shall not impair or affect the validity of an amendment under this Section 9.01.

SECTION 9.02. With Consent of Holders of Debt Securities. Without notice to any Holder but with the consent (evidenced as provided in Section 8.01) of the Holders of a majority in aggregate principal amount of the outstanding Debt Securities of each series affected by such supplemental Indenture, (a) the Issuer, when authorized by Board Resolutions, and the Trustee may from time to time and at any time enter into an Indenture or Indentures supplemental hereto (which shall conform to the provisions of the Trust Indenture Act as in force at the date of execution thereof) for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of the Indenture or of any supplemental Indenture or of modifying in any manner the rights of the Holders of the Debt Securities of such series, and (b) subject to the Sections 6.04 and 6.08, any existing

Default or Events of Default or compliance with any provision of the Indenture or the Debt Securities of such series may be waived; provided, that no such supplemental Indenture or waiver, without the consent of the Holders of each Debt Security so affected, shall (i) reduce the percentage in principal amount of Debt Securities of any series whose Holders must consent to an amendment, supplement or waiver; (ii) reduce the principal of or change the Stated Maturity of any Debt Security; (iii) reduce or waive the premium payable upon the redemption of any Debt Security or alter or waive any provisions by which any Debt Security may or shall be redeemed in accordance with Article III (other than provisions requiring the repurchase of the Debt Securities of such series if so permitted by the Board Resolutions or supplemental Indenture establishing the terms of such series); (iv) reduce the rate of or change the time for payment of interest on any Debt Security; (v) waive a Default or an Event of Default in the payment of principal of, or premium, if any, or interest on a Debt Security except for a rescission of an acceleration of such Debt Securities by the Holders of at least a majority in aggregate principal amount of such Debt Securities and a waiver of the payment default that resulted from such acceleration; (vi) except as otherwise permitted under the Indenture, release any security that may have been granted in respect of the Debt Securities; (vii) make any Debt Security payable in Currency other than that stated in the Debt Security; (viii) make any change in the provisions of the Indenture relating to waivers of past Defaults or the rights of Holders to receive payments of principal of or premium, if any, or interest on the Debt Securities; (ix) waive a redemption payment with respect to any Debt Security (other than a payment required by a covenant requiring the repurchase of the Debt Securities of such series if so permitted by the Board Resolutions or supplemental Indenture establishing the terms of such series); (x) except as otherwise permitted under the Indenture with respect to Debt Securities that are guaranteed, release any guarantor from its obligations under the Indenture or under its guarantee or change any guarantee in any manner that would adversely affect the rights of Holders of such Debt Securities; or (xi) make any change in Section 6.06 or this Section 9.02.

A supplemental Indenture which changes or eliminates any covenant or other provision of the Indenture which has been expressly included solely for the benefit of one or more particular series of Debt Securities or which modifies the rights of the Holders of Debt Securities of such series with respect to such covenant or other provision, shall be deemed not to affect the rights under the Indenture of the Holders of Debt Securities of any other series.

Upon the request of the Issuer, accompanied by copies of Board Resolutions authorizing the execution of any such supplemental Indenture, and upon the filing with the Trustee of evidence of the consent of Holders as aforesaid, the Trustee shall join with the Issuer and any guarantors with respect to any Debt Securities in the execution of such supplemental Indenture unless such supplemental Indenture affects the Trustee's own rights, duties or immunities under the Indenture or otherwise, in which case the Trustee may in its discretion but shall not be obligated to enter into such supplemental Indenture.

It shall not be necessary for the consent of the Holders under this Section 9.02 to approve the particular form of any proposed supplemental Indenture, but it shall be sufficient if such consent shall approve the substance thereof.

After an amendment or waiver under this Section 9.02 becomes effective, the Issuer shall mail to Holders of Debt Securities of each series affected thereby a notice briefly describing such amendment or waiver. The failure to give such notice to all such Holders, or any defect therein, shall not impair or affect the validity of an amendment or waiver under this Section 9.02.

SECTION 9.03. Effect of Supplemental Indentures. Upon the execution of any supplemental Indenture pursuant to the provisions of this Article IX, the Indenture shall be and be deemed to be modified and amended in accordance therewith and the respective rights, limitations of rights, obligations, duties and immunities under the Indenture of the Trustee, the Issuer and the Holders shall thereafter be determined, exercised and enforced hereunder subject in all respects to such

modifications and amendments, and all the terms and conditions of any such supplemental Indenture shall be and be deemed to be part of the terms and conditions of the Indenture for any and all purposes.

The Trustee, subject to the provisions of Sections 7.01 and 7.02, may receive an Officers' Certificate and an Opinion of Counsel as conclusive evidence that any such supplemental Indenture complies with the provisions of this Article IX.

SECTION 9.04. Debt Securities May Bear Notation of Changes by Supplemental Indentures. Debt Securities of any series authenticated and delivered after the execution of any supplemental Indenture pursuant to the provisions of this Article IX may, and shall if required by the Trustee, bear a notation in form approved by the Trustee as to any matter provided for in such supplemental Indenture. New Debt Securities of any series so modified as to conform, in the opinion of the Trustee and the Board of Directors, to any modification of the Indenture contained in any such supplemental Indenture may be prepared and executed by the Issuer, authenticated by the Trustee and delivered in exchange for the Debt Securities of such series then outstanding. Failure to make the appropriate notation or to issue a new Debt Security of such series shall not affect the validity of such amendment.

SECTION 10.01. Consolidations and Mergers of the Issuer. The Issuer may not, directly or indirectly: (1) consolidate or merge with or into another Person (whether or not the Issuer is the survivor); or (2) sell, assign, transfer, lease, convey or otherwise dispose of all or substantially all of its properties or assets, in one or more related transactions, to another Person; unless:

SECTION 10.02. Rights and Duties of Successor Company. In case of any consolidation, merger or disposition respecting the Issuer in accordance with Section 10.01, the Successor Company shall succeed to and be substituted for the Issuer, with the same effect as if it had been named herein as the party of the first part, and the Issuer shall be relieved of any further obligation under the Indenture and the Debt Securities. The Successor Company thereupon may cause to be signed, and may issue either in its own name or in the name of the Issuer, any or all the Debt Securities issuable hereunder which theretofore shall not have been signed by the Issuer and delivered to the Trustee; and, upon the order of the Successor Company, instead of the Issuer, and subject to all the terms, conditions and limitations in the Indenture prescribed, the Trustee shall authenticate and shall deliver any Debt Securities which previously shall have been signed and delivered by the officers of the Issuer or its General Partner, as the case may be, to the Trustee for authentication, and any Debt Securities which the Successor Company thereafter shall cause to be signed and delivered to the Trustee for that

purpose. All the Debt Securities so issued shall in all respects have the same legal rank and benefit under the Indenture as the Debt Securities theretofore or thereafter issued in accordance with the terms of the Indenture as though all such Debt Securities had been issued at the date of the execution hereof.

In case of any such consolidation, merger or disposition such changes in phraseology and form (but not in substance) may be made in the Debt Securities appertaining thereto thereafter to be issued as may be appropriate.

SECTION 11.01. Satisfaction and Discharge; Application of Trust Money. The Indenture shall upon the request of the Issuer cease to be of further effect with respect to all Outstanding Debt Securities of any series (except as to surviving rights of registration of transfer or exchange of Debt Securities of such series herein expressly provided for, the Issuer's obligations under Section 7.06, and the Trustee's and each paying agent's obligations under the last paragraph of this Section 11.01 and Section 11.02) and the Trustee, on demand and at the expense of the Issuer, shall execute proper instruments acknowledging satisfaction and discharge of the Indenture with respect to such series, when:

In order to have money available on a payment date to pay principal (and premium, if any, on) and interest on the Notes, the U.S. Government Obligations shall be payable as to principal (and premium, if any) or interest at least one Business Day before such payment date in such amounts as shall provide the necessary money.

The Trustee shall hold in trust money or U.S. Government Obligations deposited with it pursuant to this Article XI. It shall apply the deposited money and the money from U.S. Government Obligations through any paying agent and in accordance with the Indenture to the payment of principal of, and premium, if any, and interest on, the Debt Securities of the defeased series. Prior to the maturity of such series, the Trustee may, at the written direction of the Issuer, invest such money in U.S. Government Obligations.

SECTION 11.02. Repayment to Issuer. The Trustee and any paying agent shall promptly turn over to the Issuer upon request any excess money or securities held by them at any time.

Subject to any applicable abandoned property law, the Trustee and any paying agent shall pay to the Issuer upon request any money held by them for the payment of principal, premium or interest that remains unclaimed for two years, and, thereafter, Holders entitled to such money must look to the Issuer for payment as general creditors.

SECTION 11.03. Indemnity for U.S. Government Obligations. The Issuer shall pay and shall indemnify the Trustee and the Holders against any tax, fee or other charge imposed on or assessed against deposited U.S. Government Obligations or the principal and interest received on such U.S. Government Obligations.

SECTION 11.04. Reinstatement. If the Trustee or any paying agent is unable to apply any money or U.S. Government Obligations in accordance with this Article XI by reason of any legal proceeding or by reason of any order or judgment of any court or government authority enjoining, restraining or otherwise prohibiting such application, the Issuer's obligations under the Indenture and the Debt Securities of the defeased series shall be revived and reinstated as though no deposit had occurred pursuant to this Article XI until such time as the Trustee or any paying agent is permitted to apply all such money or U.S. Government Obligations in accordance with this Article XI.

SECTION 12.01. Successors and Assigns of Issuer Bound by Indenture. All the covenants, stipulations, promises and agreements in the Indenture contained by or in behalf of the Issuer or the Trustee shall bind their respective successors and assigns, whether so expressed or not.

SECTION 12.02. Acts of Board, Committee or Officer of Successor Company Valid. Any act or proceeding by any provision of the Indenture authorized or required to be done or performed by any Board of Directors, committee thereof or officer of the General Partner, as applicable, shall and may be done and performed with like force and effect by the like Board of Directors, committee thereof or officer of any Successor Company.

SECTION 12.03. Required Notices or Demands. Except as otherwise expressly provided in the Indenture, any notice or demand which by any provision of the Indenture is required or permitted to be given or served by the Trustee or by the Holders to or on the Issuer shall be in writing in the English language and may be given or served by being deposited postage prepaid in a post office letter box in the United States addressed (until another address is filed by the Issuer with the Trustee) as

follows: MarkWest Energy Partners, L.P., 155 Inverness Drive West, Suite 200, Englewood, Colorado 80112, Attention: Andrew L. Schroeder. Except as otherwise expressly provided in the Indenture, any notice, direction, request or demand by the Issuer or by any Holder to or upon the Trustee shall be in writing in the English language and may be given or made, for all purposes, by being deposited, postage prepaid, in a post office letter box in the United States addressed to the Corporate Office of the Trustee initially at Wells Fargo Bank, N.A., 505 Main Street, Suite 301, Fort Worth, Texas 76102. The Issuer or the Trustee by notice to the other may designate additional or different addresses for subsequent notices or communications.

Any notice required or permitted to a Registered Holder by the Issuer or the Trustee pursuant to the provisions of the Indenture shall be in writing in the English language and shall be deemed to be properly mailed by being deposited postage prepaid in a post office letter box in the United States addressed to such Holder at the address of such Holder as shown on the Debt Security Register. Any report pursuant to Section 313 of the Trust Indenture Act shall be transmitted in compliance with subsection (c) therein.

In the event of suspension of regular mail service or by reason of any other cause it shall be impracticable to give notice by mail, then such notification as shall be given with the approval of the Trustee shall constitute sufficient notice for every purpose thereunder.

Failure to mail a notice or communication to a Holder or any defect in it or any defect in any notice by publication as to a Holder shall not affect the sufficiency of such notice with respect to other Holders. If a notice or communication is mailed or published in the manner provided above, it is conclusively presumed duly given.

SECTION 12.04. Indenture and Debt Securities to Be Construed in Accordance with the Laws of the State of New York. The Indenture and each Debt Security shall be deemed to be New York contracts, and for all purposes shall be construed in accordance with the laws of said State.

SECTION 12.05. Officers' Certificate and Opinion of Counsel to Be Furnished upon Application or Demand by the Issuer. Upon any application or demand by the Issuer to the Trustee to take any action under any of the provisions of the Indenture, the Issuer shall furnish to the Trustee an Officers' Certificate stating that all conditions precedent provided for in the Indenture relating to the proposed action have been complied with and an Opinion of Counsel stating that, in the opinion of such counsel, all such conditions precedent have been complied with, except that in the case of any such application or demand as to which the furnishing of such document is specifically required by any provision of the Indenture relating to such particular application or demand, no additional certificate or opinion need be furnished.

Each certificate or opinion provided for in the Indenture and delivered to the Trustee with respect to compliance with a condition or covenant provided for in the Indenture shall include (1) a statement that the Person making such certificate or opinion has read such covenant or condition, (2) a brief statement as to the nature and scope of the examination or investigation upon which the statements or opinions contained in such certificate or opinion are based, (3) a statement that, in the opinion of such Person, he has made such examination or investigation as is necessary to enable him to express an informed opinion as to whether or not such covenant or condition has been complied with and (4) a statement as to whether or not, in the opinion of such Person, such condition or covenant has been complied with.

SECTION 12.06. Payments Due on Legal Holidays. In any case where the date of maturity of interest on or principal of and premium, if any, on the Debt Securities of a series or the date fixed for redemption or repayment of any Debt Security or the making of any sinking fund payment shall not be a business day at any Place of Payment for the Debt Securities of such series, then payment of interest or principal and premium, if any, or the making of such sinking fund payment need not be made on

such date at such Place of Payment, but may be made on the next succeeding business day at such Place of Payment with the same force and effect as if made on the date of maturity or the date fixed for redemption, and no interest shall accrue for the period after such date. If a record date is not a business day, the record date shall not be affected.

SECTION 12.07. Provisions Required by Trust Indenture Act to Control. If and to the extent that any provision of the Indenture limits, qualifies or conflicts with another provision included in the Indenture which is required to be included in the Indenture by any of Sections 310 to 318, inclusive, of the Trust Indenture Act, such required provision shall control.

SECTION 12.08. Computation of Interest on Debt Securities. Interest, if any, on the Debt Securities shall be computed on the basis of a 360-day year of twelve 30-day months, except as may otherwise be provided pursuant to Section 2.03.

SECTION 12.09. Rules by Trustee, Paying Agent and Registrar. The Trustee may make reasonable rules for action by or a meeting of Holders. The Registrar and any paying agent may make reasonable rules for their functions.

SECTION 12.10. No Recourse Against Others. No past, present or future director, officer, partner, employee, incorporator, manager, stockholder, unitholder or member of the Issuer, the General Partner or any other obligor on the Debt Securities of any series, as such, shall have any liability for any obligations of the Issuer or such other obligors under the Debt Securities, the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting a Debt Security waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Debt Securities.

SECTION 12.11. Severability. In case any provision in the Indenture or the Debt Securities shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

SECTION 12.12. Effect of Headings. The article and section headings herein and in the Table of Contents are for convenience only and shall not affect the construction hereof.

SECTION 12.13. Indenture May Be Executed in Counterparts. The Indenture may be executed in any number of counterparts, each of which shall be an original, but such counterparts shall together constitute but one and the same instrument.

The Trustee hereby accepts the trusts in the Indenture upon the terms and conditions herein set forth.

IN WITNESS WHEREOF, the parties hereto have caused the Indenture to be duly signed as of the date first written above.

		,
as Trustee
By	Authorized Signatory
Dated:

			MARKWEST ENERGY PARTNERS, L.P.
			By MARKWEST ENERGY GP, L.L.C., its General Partner
			By
				Name: Title:
			WELLS FARGO BANK, NA
			By
				Name: Title:

ARTICLE I Definitions			1
	SECTION 1.01.	Certain Terms Defined	1
	SECTION 1.02.	Other Definitions	6
	SECTION 1.03.	Incorporation by Reference of Trust Indenture Act	6
	SECTION 1.04.	Rules of Construction	7
ARTICLE II Debt Securities			7
	SECTION 2.01.	Forms Generally	7
	SECTION 2.02.	Form of Trustee's Certificate of Authentication	7
	SECTION 2.03.	Principal Amount; Issuable in Series	7
	SECTION 2.04.	Execution of Debt Securities	9
	SECTION 2.05.	Authentication and Delivery of Debt Securities	10
	SECTION 2.06.	Denomination of Debt Securities	11
	SECTION 2.07.	General Provisions for Registration of Transfer and Exchange	11
	SECTION 2.08.	Temporary Debt Securities	12
	SECTION 2.09.	Mutilated, Destroyed, Lost or Stolen Debt Securities	12
	SECTION 2.10.	Cancellation of Surrendered Debt Securities	13
	SECTION 2.11.	Provisions of the Indenture and Debt Securities for the Sole Benefit of the Parties and the Holders	13
	SECTION 2.12.	Payment of Interest; Rights Preserved	13
	SECTION 2.13.	Securities Denominated in Foreign Currencies	14
	SECTION 2.14.	Wire Transfers	14
	SECTION 2.15.	Securities Issuable in the Form of a Global Security	14
	SECTION 2.16.	Medium Term Securities	16
	SECTION 2.17.	Defaulted Interest	16
	SECTION 2.18.	Judgments	17
	SECTION 2.19.	CUSIP Numbers	17
ARTICLE III Redemption of Debt Securities			18
	SECTION 3.01.	Applicability of Article	18
	SECTION 3.02.	Notice of Redemption; Selection of Debt Securities	18
	SECTION 3.03.	Payment of Debt Securities Called for Redemption	19
	SECTION 3.04.	Mandatory and Optional Sinking Funds	19
	SECTION 3.05.	Redemption of Debt Securities for Sinking Fund	20
ARTICLE IV Particular Covenants of the Issuer			21
	SECTION 4.01.	Payment of Principal of, and Premium, If Any, and Interest on, Debt Securities	21
	SECTION 4.02.	Maintenance of Offices or Agencies for Registration of Transfer, Exchange and Payment of Debt Securities	21
	SECTION 4.03.	Appointment to Fill a Vacancy in the Office of Trustee	22
	SECTION 4.04.	Duties of Paying Agents, etc.	22
	SECTION 4.05.	Statement by Officers as to Default	23
	SECTION 4.06.	Further Instruments and Acts	23
	SECTION 4.07.	Corporate, Partnership or Limited Liability Company Existence	23
	SECTION 4.08.	Maintenance of Properties	23

	SECTION 4.09.	Payment of Taxes and Other Claims	24
	SECTION 4.10.	Calculation of Original Issue Discount	24
	SECTION 4.11.	Stay, Extension and Usury Laws	24
ARTICLE V Holders' Lists and Reports by the Issuer and the Trustee			24
	SECTION 5.01.	Issuer to Furnish Trustee Information as to Names and Addresses of Holders; Preservation of Information	24
	SECTION 5.02.	Communications to Holders; Meetings of Holders	25
	SECTION 5.03.	Reports by Issuer	25
	SECTION 5.04.	Reports by Trustee	26
	SECTION 5.05.	Record Dates for Action by Holders	26
ARTICLE VI Remedies of the Trustee and Holders in Event of Default			26
	SECTION 6.01.	Events of Default	26
	SECTION 6.02.	Collection of Indebtedness by Trustee, etc.	27
	SECTION 6.03.	Application of Moneys Collected by Trustee	28
	SECTION 6.04.	Limitation on Suits by Holders	29
	SECTION 6.05.	Remedies Cumulative; Delay or Omission in Exercise of Rights Not a Waiver of Default	30
	SECTION 6.06.	Rights of Holders of Majority in Principal Amount of Debt Securities to Direct Trustee and to Waive Default	30
	SECTION 6.07.	Trustee to Give Notice of Defaults Known to It, but May Withhold Such Notice in Certain Circumstances	30
	SECTION 6.08.	Requirement of an Undertaking To Pay Costs in Certain Suits under the Indenture or Against the Trustee	31
ARTICLE VII Concerning the Trustee			31
	SECTION 7.01.	Certain Duties and Responsibilities	31
	SECTION 7.02.	Certain Rights of Trustee	32
	SECTION 7.03.	Trustee Not Liable for Recitals in Indenture or in Debt Securities	33
	SECTION 7.04.	Trustee, Paying Agent or Registrar May Own Debt Securities	33
	SECTION 7.05.	Moneys Received by Trustee to Be Held in Trust	34
	SECTION 7.06.	Compensation and Reimbursement	34
	SECTION 7.07.	Right of Trustee to Rely on an Officers' Certificate Where No Other Evidence Specifically Prescribed	34
	SECTION 7.08.	Separate Trustee; Replacement of Trustee	34
	SECTION 7.09.	Successor Trustee by Merger	35
	SECTION 7.10.	Eligibility; Disqualification	36
	SECTION 7.11.	Preferential Collection of Claims Against Issuer	36
	SECTION 7.12.	Compliance with Tax Laws	36
ARTICLE VIII Concerning the Holders			36
	SECTION 8.01.	Evidence of Action by Holders	36
	SECTION 8.02.	Proof of Execution of Instruments and of Holding of Debt Securities	36
	SECTION 8.03.	Who May Be Deemed Owner of Debt Securities	37
	SECTION 8.04.	Instruments Executed by Holders Bind Future Holders	37
ARTICLE IX Amendment, Supplement and Waiver			37
	SECTION 9.01.	Without Consent of Holders of Debt Securities	37
	SECTION 9.02.	With Consent of Holders of Debt Securities	38

	SECTION 9.03.	Effect of Supplemental Indentures	39
	SECTION 9.04.	Debt Securities May Bear Notation of Changes by Supplemental Indentures	40
ARTICLE X Consolidation, Merger, Sale or Conveyance			40
	SECTION 10.01.	Consolidations and Mergers of the Issuer	40
	SECTION 10.02.	Rights and Duties of Successor Company	40
ARTICLE XI Satisfaction and Discharge of Indenture; Unclaimed Moneys			41
	SECTION 11.01.	Satisfaction and Discharge; Application of Trust Money	41
	SECTION 11.02.	Repayment to Issuer	42
	SECTION 11.03.	Indemnity for U.S. Government Obligations	42
	SECTION 11.04.	Reinstatement	42
ARTICLE XII Miscellaneous Provisions			42
	SECTION 12.01.	Successors and Assigns of Issuer Bound by Indenture	42
	SECTION 12.02.	Acts of Board, Committee or Officer of Successor Company Valid	42
	SECTION 12.03.	Required Notices or Demands	42
	SECTION 12.04.	Indenture and Debt Securities to Be Construed in Accordance with the Laws of the State of New York	43
	SECTION 12.05.	Officers' Certificate and Opinion of Counsel to Be Furnished upon Application or Demand by the Issuer	43
	SECTION 12.06.	Payments Due on Legal Holidays	43
	SECTION 12.07.	Provisions Required by Trust Indenture Act to Control	44
	SECTION 12.08.	Computation of Interest on Debt Securities	44
	SECTION 12.09.	Rules by Trustee, Paying Agent and Registrar	44
	SECTION 12.10.	No Recourse Against Others	44
	SECTION 12.11.	Severability	44
	SECTION 12.12.	Effect of Headings	44
	SECTION 12.13.	Indenture May Be Executed in Counterparts	44

Trust Indenture Act Section		Indenture Section
310(a)(1)		7.10
(a)(2)		7.10
(a)(3)		N/A
(a)(4)		N/A
(a)(5)		7.10
(b)		7.10
(c)		N/A
311(a)		7.11
(b)		7.11
(c)		N/A
312(a)		5.01
(b)		5.02
(c)		5.02
313(a)		5.04
(b)(1)		5.04
(b)(2)		5.04
(c)		5.04; 12.03
(d)		5.04
314(a)		5.03; 12.03
(b)		N/A
(c)(1)		12.05
(c)(2)		12.05
(c)(3)		N/A
(d)		N/A
(e)		12.05
(f)		N/A
315(a)		7.01
(b)		6.07; 12.03
(c)		7.01
(d)		7.01
(e)		6.03
316(a)(last sentence)		1.01
(a)(1)(A)		6.06
(a)(1)(B)		6.06
(a)(2)		N/A
(b)		6.04
(c)		2.17
317(a)(1)		6.02
(a)(2)		6.09
(b)		404
318(a)		12.07
(b)		N/A
(c)		12.07