<PAGE>

                                                                    Exhibit 4.01

================================================================================



                      BUILDING ONE SERVICES CORPORATION,


                                  as Issuer,


                         the GUARANTORS named herein,


                                as Guarantors,


                                      and

                              __________________
                      IBJ WHITEHALL BANK & TRUST COMPANY,


                                  as Trustee

                              __________________

                                   INDENTURE

                          Dated as of April 30, 1999



                              up to $400,000,000

                              __________________

                    10 1/2% Senior Subordinated Notes due 2009



================================================================================
<PAGE>

                             CROSS-REFERENCE TABLE

<TABLE>
<CAPTION>
  TIA                                                                             Indenture
Section                                                                            Section
-------                                                                           ---------
<S>                                                                               <C>
310(a)(1)..................................................................         7.10
      (a)(2)...............................................................         7.10
      (a)(3)...............................................................         N.A.
      (a)(4)...............................................................         N.A.
      (a)(5)...............................................................         7.08; 7.10
      (b)..................................................................         7.08; 7.10; 13.02
      (c)..................................................................         N.A.
311(a).....................................................................         7.11
      (b)..................................................................         7.11
      (c)..................................................................         N.A.
      312(a)...............................................................         2.05
      (b)..................................................................         13.03
      (c)..................................................................         13.03
313(a).....................................................................         7.06
      (b)(1)...............................................................         7.06
      (b)(2)...............................................................         7.06
      (c)..................................................................         7.06; 13.02
      (d)..................................................................         7.06
314(a).....................................................................         4.08; 4.10; 13.02
      (b)..................................................................         N.A.
      (c)(1)...............................................................         7.02; 13.04; 13.05
      (c)(2)...............................................................         7.02; 13.04; 13.05
      (c)(3)...............................................................         N.A.
      (d)..................................................................         N.A.
      (e)..................................................................         13.05
      (f)..................................................................         N.A.
315(a).....................................................................         7.01(b)
      (b)..................................................................         7.05
      (c)..................................................................         7.01
      (d)..................................................................         6.05; 7.01(c)
      (e)..................................................................         6.11
316(a)(last sentence)......................................................         2.09
      (a)(1)(A)............................................................         6.05
      (a)(1)(B)............................................................         6.04
      (a)(2)...............................................................         9.05
      (b)..................................................................         6.07
      (c)..................................................................         9.05
</TABLE>

______________________

N.A. means Not Applicable

Note:  This Cross-Reference Table shall not, for any purpose, be deemed to be a
       part of the Indenture
<PAGE>

<TABLE>
<S>                                                                                 <C>
317(a)(1)..................................................................         6.08
      (a)(2)...............................................................         6.09
      (b)..................................................................         2.04
318(a).....................................................................         13.01
      (c)..................................................................         13.01
</TABLE>

______________________

N.A. means Not Applicable

Note:  This Cross-Reference Table shall not, for any purpose, be deemed to be a
       part of the Indenture
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                 Page
                                                                                                 ----
<S>                                                                                              <C>
                                                   ARTICLE ONE

                                    DEFINITIONS AND INCORPORATION BY REFERENCE

SECTION 1.01.      Definitions......................................................................1
SECTION 1.02.      Incorporation by Reference of TIA...............................................33
SECTION 1.03.      Rules of Construction...........................................................34

                                                    ARTICLE TWO

                                                  THE SECURITIES

SECTION 2.01.      Form and Dating.................................................................34
SECTION 2.02.      Execution and Authentication....................................................35
SECTION 2.03.      Registrar and Paying Agent......................................................36
SECTION 2.04.      Paying Agent To Hold Assets in Trust............................................37
SECTION 2.05.      Holder Lists....................................................................37
SECTION 2.06.      Transfer and Exchange...........................................................37
SECTION 2.07.      Replacement Securities..........................................................38
SECTION 2.08.      Outstanding Securities..........................................................39
SECTION 2.09.      Treasury Securities.............................................................39
SECTION 2.10.      Temporary Securities............................................................40
SECTION 2.11.      Cancellation....................................................................40
SECTION 2.12.      Defaulted Interest..............................................................40
SECTION 2.13.      CUSIP Number....................................................................41
SECTION 2.14.      Deposit of Moneys...............................................................41
SECTION 2.15.      Book-Entry Provisions for Global Securities.....................................41
SECTION 2.16.      Special Transfer Provisions.....................................................43

                                                   ARTICLE THREE

                                                    REDEMPTION

SECTION 3.01.      Notices to Trustee..............................................................46
SECTION 3.02.      Selection of Securities To Be Redeemed..........................................46
SECTION 3.03.      Notice of Redemption............................................................47
</TABLE>

                                      -i-
<PAGE>

<TABLE>
<CAPTION>
                                                                                                 Page
                                                                                                 ----
<S>                                                                                              <C>
SECTION 3.04.      Effect of Notice of Redemption..................................................48
SECTION 3.05.      Deposit of Redemption Price.....................................................48
SECTION 3.06.      Securities Redeemed in Part.....................................................48

                                                   ARTICLE FOUR

                                                     COVENANTS

SECTION 4.01.      Payment of Securities...........................................................49
SECTION 4.02.      Maintenance of Office or Agency.................................................49
SECTION 4.03.      Limitation on Restricted Payments...............................................50
SECTION 4.04.      Limitation on Incurrence of Additional Indebtedness.............................52
SECTION 4.05.      Corporate Existence.............................................................53
SECTION 4.06.      Payment of Taxes and Other Claims...............................................53
SECTION 4.07.      Maintenance of Properties and Insurance.........................................53
SECTION 4.08.      Compliance Certificate; Notice of Default.......................................54
SECTION 4.09.      Compliance with Laws............................................................55
SECTION 4.10.      Reports to Holders..............................................................55
SECTION 4.11.      Waiver of Stay, Extension or Usury Laws.........................................56
SECTION 4.12.      Limitations on Transactions with Affiliates.....................................57
SECTION 4.13.      Limitation on Dividend and Other Payment Restrictions Affecting Restricted
                      Subsidiaries.................................................................59
SECTION 4.14.      Limitation on Liens.............................................................60
SECTION 4.15.      Change of Control...............................................................61
SECTION 4.16.      Limitation on Asset Sales.......................................................63
SECTION 4.17.      Prohibition on Incurrence of Senior Subordinated Debt...........................67
SECTION 4.18.      Additional Subsidiary Guarantees................................................67
SECTION 4.19.      Conduct of Business.............................................................68

                                                   ARTICLE FIVE

                                               SUCCESSOR CORPORATION

SECTION 5.01.      Merger, Consolidation and Sale of Assets........................................68
SECTION 5.02.      Successor Corporation Substituted...............................................70
</TABLE>

                                     -ii-
<PAGE>

<TABLE>
<CAPTION>
                                                                                                 Page
                                                                                                 ----
<S>                                                                                              <C>
                                                    ARTICLE SIX

                                               DEFAULT AND REMEDIES

SECTION 6.01.      Events of Default...............................................................70
SECTION 6.02.      Acceleration....................................................................72
SECTION 6.03.      Other Remedies..................................................................73
SECTION 6.04.      Waiver of Past Defaults.........................................................74
SECTION 6.05.      Control by Majority.............................................................74
SECTION 6.06.      Limitation on Suits.............................................................74
SECTION 6.07.      Rights of Holders To Receive Payment............................................75
SECTION 6.08.      Collection Suit by Trustee......................................................75
SECTION 6.09.      Trustee May File Proofs of Claim................................................75
SECTION 6.10.      Priorities......................................................................76
SECTION 6.11.      Undertaking for Costs...........................................................77

                                                   ARTICLE SEVEN

                                                      TRUSTEE

SECTION 7.01.      Duties of Trustee...............................................................77
SECTION 7.02.      Rights of Trustee...............................................................78
SECTION 7.03.      Individual Rights of Trustee....................................................80
SECTION 7.04.      Trustee's Disclaimer............................................................80
SECTION 7.05.      Notice of Default...............................................................80
SECTION 7.06.      Reports by Trustee to Holders...................................................81
SECTION 7.07.      Compensation and Indemnity......................................................81
SECTION 7.08.      Replacement of Trustee..........................................................82
SECTION 7.09.      Successor Trustee by Merger, Etc................................................83
SECTION 7.10.      Eligibility; Disqualification...................................................84
SECTION 7.11.      Preferential Collection of Claims Against Company...............................84

                                                   ARTICLE EIGHT

                                        DISCHARGE OF INDENTURE; DEFEASANCE

SECTION 8.01.      Termination of the Company's Obligations........................................84
SECTION 8.02.      Legal Defeasance and Covenant Defeasance........................................86
SECTION 8.03.      Conditions to Legal Defeasance or Covenant Defeasance...........................88
SECTION 8.04.      Application of Trust Money......................................................90
</TABLE>

                                     -iii-
<PAGE>

<TABLE>
<CAPTION>
                                                                                                 Page
                                                                                                 ----
<S>                                                                                              <C>
SECTION 8.05.      Repayment to the Company........................................................90
SECTION 8.06.      Reinstatement...................................................................91

                                                   ARTICLE NINE

                                        AMENDMENTS, SUPPLEMENTS AND WAIVERS

SECTION 9.01.      Without Consent of Holders......................................................91
SECTION 9.02.      With Consent of Holders.........................................................92
SECTION 9.03.      Effect on Senior Debt...........................................................94
SECTION 9.04.      Compliance with TIA.............................................................94
SECTION 9.05.      Revocation and Effect of Consents...............................................94
SECTION 9.06.      Notation on or Exchange of Securities...........................................95
SECTION 9.07.      Trustee To Sign Amendments, Etc.................................................95

                                                    ARTICLE TEN

                                            SUBORDINATION OF SECURITIES

SECTION 10.01.     Securities Subordinated to Senior Debt..........................................96
SECTION 10.02.     Suspension of Payment When Senior Debt Is in Default............................96
SECTION 10.03.     Securities Subordinated to Prior Payment of All Senior Debt on Dissolution,
                      Liquidation or Reorganization of Company.....................................98
SECTION 10.04.     Payments May Be Paid Prior to Dissolution......................................100
SECTION 10.05.     Holders To Be Subrogated to Rights of Holders of Senior Debt...................100
SECTION 10.06.     Obligations of the Company Unconditional.......................................101
SECTION 10.07.     Notice to Trustee..............................................................101
SECTION 10.08.     Reliance on Judicial Order or Certificate of Liquidating Agent.................102
SECTION 10.09.     Trustee's Relation to Senior Debt..............................................102
SECTION 10.10.     Subordination Rights Not Impaired by Acts or Omissions of the Company
                      or Holders of Senior Debt...................................................103
SECTION 10.11.     Securityholders Authorize Trustee To Effectuate Subordination of Securities....103
</TABLE>

                                     -iv-
<PAGE>

<TABLE>
<CAPTION>
                                                                                                 Page
                                                                                                 ----
<S>                                                                                              <C>
SECTION 10.12.     This Article Ten Not To Prevent Events of Default..............................104
SECTION 10.13.     Trustee's Compensation Not Prejudiced..........................................104

                                                  ARTICLE ELEVEN

                                              GUARANTEE OF SECURITIES

SECTION 11.01.     Unconditional Guarantee........................................................105
SECTION 11.02.     Limitations on Guarantees......................................................106
SECTION 11.03.     Execution and Delivery of Guarantee............................................107
SECTION 11.04.     Release of a Guarantor.........................................................107
SECTION 11.05.     Waiver of Subrogation..........................................................108
SECTION 11.06.     Immediate Payment..............................................................109
SECTION 11.07.     No Set-Off.....................................................................109
SECTION 11.08.     Obligations Absolute...........................................................109
SECTION 11.09.     Obligations Continuing.........................................................110
SECTION 11.10.     Obligations Not Reduced........................................................110
SECTION 11.11.     Obligations Reinstated.........................................................110
SECTION 11.12.     Obligations Not Affected.......................................................111
SECTION 11.13.     Waiver.........................................................................112
SECTION 11.14.     No Obligation To Take Action Against the Company...............................112
SECTION 11.15.     Dealing with the Company and Others............................................113
SECTION 11.16.     Default and Enforcement........................................................113
SECTION 11.17.     Amendment, Etc.................................................................114
SECTION 11.18.     Acknowledgment.................................................................114
SECTION 11.19.     Costs and Expenses.............................................................114
SECTION 11.20.     No Merger or Waiver; Cumulative Remedies.......................................114
SECTION 11.21.     Survival of Obligations........................................................114
SECTION 11.22.     Guarantee in Addition to Other Obligations.....................................115
SECTION 11.23.     Severability...................................................................115
SECTION 11.24.     Successors and Assigns.........................................................115

                                                  ARTICLE TWELVE

                                            SUBORDINATION OF GUARANTEE

SECTION 12.01.     Guarantee Obligations Subordinated to Guarantor Senior Debt....................115
</TABLE>

                                      -v-
<PAGE>

<TABLE>
<CAPTION>
                                                                                                 Page
                                                                                                 ----
<S>                                                                                              <C>
SECTION 12.02.     Suspension of Guarantee Obligations When GuarantorSenior Debt Is in Default....116
SECTION 12.03.     Guarantee Obligations Subordinated to Prior Payment of All Guarantor
                      Senior Debt on Dissolution, Liquidation or Reorganization of Such Guarantor.117
SECTION 12.04.     Payments May Be Paid Prior to Dissolution......................................118
SECTION 12.05.     Holders of Guarantee Obligations To Be Subrogated to Rights of
                      Holders of Guarantor Senior Debt............................................119
SECTION 12.06.     Obligations of the Guarantors Unconditional....................................119
SECTION 12.07.     Notice to Trustee..............................................................120
SECTION 12.08.     Reliance on Judicial Order or Certificate of Liquidating Agent.................121
SECTION 12.09.     Trustee's Relation to Guarantor Senior Debt....................................121
SECTION 12.10.     Subordination Rights Not Impaired by Acts or Omissions of the Guarantors
                      or Holders of Guarantor Senior Debt.........................................122
SECTION 12.11.     Holders Authorize Trustee To Effectuate Subordination of
                      Guarantee Obligations.......................................................122
SECTION 12.12.     This Article Twelve Not To Prevent Events of Default...........................123
SECTION 12.13.     Trustee's Compensation Not Prejudiced..........................................123

                                                 ARTICLE THIRTEEN

                                                   MISCELLANEOUS

SECTION 13.01.     TIA Controls...................................................................123
SECTION 13.02.     Notices........................................................................124
SECTION 13.03.     Communications by Holders with Other Holders...................................125
SECTION 13.04.     Certificate and Opinion as to Conditions Precedent.............................125
</TABLE>

                                     -vi-
<PAGE>

<TABLE>
<CAPTION>
                                                                                                 Page
                                                                                                 ----
<S>                                                                                              <C>
SECTION 13.05.     Statements Required in Certificate or Opinion..................................125
SECTION 13.06.     Rules by Trustee, Paying Agent, Registrar......................................126
SECTION 13.07.     Legal Holidays.................................................................126
SECTION 13.08.     Governing Law..................................................................126
SECTION 13.09.     No Adverse Interpretation of Other Agreements..................................127
SECTION 13.10.     No Recourse Against Others.....................................................127
SECTION 13.11.     Successors.....................................................................127
SECTION 13.12.     Duplicate Originals............................................................127
SECTION 13.13.     Severability...................................................................127

Signatures........................................................................................S-1
</TABLE>


Exhibit A   - Form of Note
Exhibit B   - Form of Legends
Exhibit C   - Form of Certificate To Be Delivered in Connection with Transfers
              to Non-QIB Accredited Investors
Exhibit D   - Form of Certificate To Be Delivered in Connection with Transfers
              Pursuant to Regulation S
Exhibit E   - Form of Guarantee

Note:  This Table of Contents shall not, for any purpose, be deemed to be part
        of the Indenture

                                     -vii-
<PAGE>

          INDENTURE dated as of April 30, 1999 among BUILDING ONE SERVICES
CORPORATION, a Delaware corporation (the "Company"), as Issuer, each of the
                                          -------
Guarantors named herein, as Guarantors, and IBJ WHITEHALL BANK & TRUST COMPANY,
a New York banking corporation, as Trustee (the "Trustee").
                                                 -------

          The Company has duly authorized the creation of an issue of 10 1/2%
Senior Subordinated Notes due 2009 and, to provide therefor, the Company has
duly authorized the execution and delivery of this Indenture.  All things
necessary to make the Securities, when duly issued and executed by the Company
and authenticated and delivered hereunder, the valid and binding obligations of
the Company and to make this Indenture a valid and binding agreement of the
Company have been done.

          Each party hereto agrees as follows for the benefit of each other
party and for the equal and ratable benefit of the Holders of the Securities:

                                  ARTICLE ONE

                   DEFINITIONS AND INCORPORATION BY REFERENCE

SECTION 1.01.  Definitions.
               -----------

          "Acquired Indebtedness" means Indebtedness of a Person or any of its
           ---------------------
Restricted Subsidiaries existing at the time such Person becomes a Restricted
Subsidiary of the Company or at the time it merges or consolidates with or into
the Company or any of its Subsidiaries or is assumed in connection with the
acquisition of assets from such Person and in each case whether or not incurred
by such Person in connection with, or in anticipation or contemplation of, such
Person becoming a Restricted Subsidiary of the Company or such acquisition,
merger or consolidation.

          "Affiliate" means, with respect to any specified Person, any other
           ---------
Person who directly or indirectly through one or more intermediaries controls,
or is controlled by, or is under common control with, such specified Person.
The term "control" means the possession, directly or indirectly, of the power to
direct or cause the direction of the management and policies of
<PAGE>

a Person, whether through the ownership of voting securities, by contract or
otherwise; and the terms "controlling" and "controlled" have meanings
correlative of the foregoing.

          "Affiliate Transaction" has the meaning set forth in Section 4.12.
           ---------------------

          "Agent" means any Registrar, Paying Agent or co-Registrar.
           -----

          "Asset Acquisition" means (a) an Investment by the Company or any
           -----------------
Restricted Subsidiary of the Company in any other Person pursuant to which such
Person shall become a Restricted Subsidiary of the Company or any Restricted
Subsidiary of the Company, or shall be merged with or into the Company or any
Restricted Subsidiary of the Company, or (b) the acquisition by the Company or
any Restricted Subsidiary of the Company of the assets of any Person (other than
a Restricted Subsidiary of the Company) which constitute all or substantially
all of the assets of such Person or comprises any operating unit, division or
line of business of such Person or any other properties or assets of such Person
other than in the ordinary course of business.

          "Asset Sale" means any direct or indirect sale, issuance, conveyance,
           ----------
transfer, lease (other than operating leases entered into in the ordinary course
of business), assignment or other transfer for value by the Company or any of
its Restricted Subsidiaries (including any Sale and Leaseback Transaction) to
any Person other than the Company or a Wholly Owned Restricted Subsidiary of the
Company of (a) any Capital Stock of any Restricted Subsidiary of the Company; or
(b) any other property or assets of the Company or any Restricted Subsidiary of
the Company other than in the ordinary course of business; provided, however,
                                                           --------  -------
that Asset Sales shall not include: (i) a transaction or series of related
transactions for which the Company or its Restricted Subsidiaries receive
aggregate consideration of less than $1.5 million; (ii) the sale, lease,
conveyance, disposition or other transfer of all or substantially all of the
assets of the Company as permitted under Section 5.01; (iii) any Restricted
Payment permitted by Section 4.03 or that constitutes a Permitted Investment;
(iv) sales of

                                      -2-
<PAGE>

damaged, worn-out or obsolete equipment or assets that, in the Company's
reasonable judgment, are no longer either used or useful in the business of the
Company or its Restricted Subsidiaries; and (v) the sale of accounts receivable
pursuant to a Qualified Receivables Transaction.

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

          "Board of Directors" means, as to any Person, the board of directors
           ------------------
of such Person or any duly authorized committee thereof.

          "Board Resolution" means, with respect to any Person, a copy of a
           ----------------
resolution certified by the Secretary or an Assistant Secretary of such Person
to have been duly adopted by the Board of Directors of such Person and to be in
full force and effect on the date of such certification, and delivered to the
Trustee.

          "Business Day" means any day other than a Saturday, Sunday or any
           ------------
other day on which banking institutions in the City of New York are required or
authorized by law or other governmental action to be closed.

          "Capital Stock" means (i) with respect to any Person that is a
           -------------
corporation, any and all shares, interests, participations or other equivalents
(however designated and whether or not voting) of corporate stock, including
each class of Common Stock and Preferred Stock of such Person (but shall not
include, prior to any conversion thereof, the Convertible Subordinated Notes),
and (ii) with respect to any Person that is not a corporation, any and all
partnership, membership or other equity interests of such Person.

          "Capitalized Lease Obligation" means, as to any Person, the
           ----------------------------
obligations of such Person under a lease that are required to be classified and
accounted for as capital lease obligations under GAAP and, for purposes of this
definition, the amount of such obligations at any date shall be the capitalized

                                      -3-
<PAGE>

amount of such obligations at such date, determined in accordance with GAAP.

          "Cash Equivalents" means (i) marketable direct obligations issued by,
           ----------------
or unconditionally guaranteed by, the United States Government or issued by any
agency thereof and backed by the full faith and credit of the United States, in
each case maturing within one year from the date of acquisition thereof; (ii)
marketable direct obligations issued by any state of the United States of
America or any political subdivision of any such state or any public
instrumentality thereof maturing within one year from the date of acquisition
thereof and, at the time of acquisition, having one of the two highest ratings
obtainable from either Standard & Poor's Ratings Group ("S&P") or Moody's
                                                         ---
Investors Service, Inc. ("Moody's"); (iii) commercial paper maturing no more
                          -------
than one year from the date of creation thereof and, at the time of acquisition,
having a rating of at least A-1 from S&P or at least P-1 from Moody's; (iv)
certificates of deposit or bankers' acceptances maturing within one year from
the date of acquisition thereof issued by any bank organized under the laws of
the United States of America or any state thereof or the District of Columbia or
any U.S. branch of a foreign bank having at the date of acquisition thereof
combined capital and surplus of not less than $250.0 million; (v) repurchase
obligations with a term of not more than seven days for underlying securities of
the types described in clause (i) above entered into with any bank meeting the
qualifications specified in clause (iv) above; and (vi) investments in money
market funds which invest substantially all their assets in securities of the
types described in clauses (i) through (v) above.

          "Change of Control" means the occurrence of one or more of the
           -----------------
following events:  (i) any sale, lease, exchange or other transfer (in one
transaction or a series of related transactions) of all or substantially all of
the assets of the Company to any Person or group of related Persons for purposes
of Section 13(d) of the Exchange Act (a "Group"), together with any Affiliates
                                         -----
thereof (whether or not otherwise in compliance with the provisions of this
Indenture), other than to the Permitted Holders; (ii) the approval by the
holders of Capital Stock of the Company of any plan or proposal for the
liquida-

                                      -4-
<PAGE>

tion or dissolution of the Company (whether or not otherwise in compliance with
the provisions of this Indenture); (iii) any Person or Group (other than the
Permitted Holders) shall become the owner, directly or indirectly, beneficially
or of record, of shares representing more than 50% of the aggregate ordinary
voting power represented by the issued and outstanding Capital Stock of the
Company; or (iv) the replacement of a majority of the Board of Directors of the
Company over a two-year period from the directors who constituted the Board of
Directors of the Company at the beginning of such period, and such replacement
shall not have been approved by the Permitted Holders or a vote of at least a
majority of the Board of Directors of the Company then still in office who
either were members of such Board of Directors at the beginning of such period
or whose election as a member of such Board of Directors was previously so
approved.

          "Change of Control Date" has the meaning set forth in Section 4.15.
           ----------------------

          "Change of Control Offer" has the meaning set forth in Section 4.15.
           -----------------------

          "Change of Control Payment Date" has the meaning set forth in Section
           ------------------------------
4.15.

          "Commission" means the Securities and Exchange Commission.
           ----------

          "Common Stock" of any Person means any and all shares, interests or
           ------------
other participations in, and other equivalents (however designated and whether
voting or non-voting) of such Person's common stock, whether outstanding on the
Issue Date or issued after the Issue Date, and includes, without limitation, all
series and classes of such common stock.

          "Company" means the party named as such in this Indenture until a
           -------
successor replaces it pursuant to this Indenture and thereafter shall mean such
successor corporation.

          "Consolidated EBITDA" means, with respect to any Person, for any
           -------------------
period, the sum (without duplication) of (i) Consolidated Net Income and (ii) to
the extent Consolidated Net

                                      -5-
<PAGE>

Income has been reduced thereby, (A) all income taxes of such Person and its
Restricted Subsidiaries paid or accrued in accordance with GAAP for such period
(other than income taxes attributable to extraordinary, unusual or nonrecurring
gains), (B) Consolidated Interest Expense and (C) Consolidated Non-cash Charges
less any non-cash items increasing Consolidated Net Income for such period, all
----
as determined on a consolidated basis for such Person and its Restricted
Subsidiaries in accordance with GAAP.

          "Consolidated Fixed Charge Coverage Ratio" means, with respect to any
           ----------------------------------------
Person, the ratio of Consolidated EBITDA of such Person during the four full
fiscal quarters (the "Four Quarter Period") ending prior to the date of the
                      -------------------
transaction giving rise to the need to calculate the Consolidated Fixed Charge
Coverage Ratio for which financial statements are available (the "Transaction
                                                                  -----------
Date") to Consolidated Fixed Charges of such Person for the Four Quarter Period.
----
In addition to and without limitation of the foregoing, for purposes of this
definition, "Consolidated EBITDA" and "Consolidated Fixed Charges" shall be
calculated after giving effect on a pro forma basis for the period of such
                                    ---------
calculation to (i) the incurrence or repayment of any Indebtedness of such
Person or any of its Restricted Subsidiaries (and the application of the
proceeds thereof) giving rise to the need to make such calculation and any
incurrence or repayment of other Indebtedness (and the application of the
proceeds thereof), other than the incurrence or repayment of Indebtedness in the
ordinary course of business for working capital purposes pursuant to working
capital facilities, occurring during the Four Quarter Period or at any time
subsequent to the last day of the Four Quarter Period and on or prior to the
Transaction Date, as if such incurrence or repayment, as the case may be (and
the application of the proceeds thereof), occurred on the first day of the Four
Quarter Period and (ii) any Asset Sales or other dispositions or Asset
Acquisitions (including, without limitation, any Asset Acquisition giving rise
to the need to make such calculation as a result of such Person or one of its
Restricted Subsidiaries (including any Person who becomes a Restricted
Subsidiary as a result of the Asset Acquisition) incurring, assuming or
otherwise being liable for Acquired Indebtedness and also including any
Consolidated EBITDA (including any pro forma expense and cost
                                   --- -----

                                     -6-
<PAGE>

reductions, adjustments and other operating improvements or synergies both
achieved by such Person during such period and to be achieved by such Person and
with respect to the acquired assets, all as determined in good faith by a
responsible financial or accounting officer of the Company and as reported on or
otherwise confirmed, consistent with applicable standards of the American
Institute of Certified Public Accountants, to the Company by an independent
public accounting firm) attributable to the assets which are the subject of the
Asset Acquisition or Asset Sale or other disposition during the Four Quarter
Period) occurring during the Four Quarter Period or at any time subsequent to
the last day of the Four Quarter Period and on or prior to the Transaction Date,
as if such Asset Sale or other disposition or Asset Acquisition (including the
incurrence, assumption or liability for any such Acquired Indebtedness) occurred
on the first day of the Four Quarter Period. If such Person or any of its
Restricted Subsidiaries directly or indirectly guarantees Indebtedness of a
third Person, the preceding sentence shall give effect to the incurrence of such
guaranteed Indebtedness as if such Person or any Restricted Subsidiary of such
Person had directly incurred or otherwise assumed such guaranteed Indebtedness.
Furthermore, in calculating "Consolidated Fixed Charges" for purposes of
determining the denominator (but not the numerator) of this "Consolidated Fixed
Charge Coverage Ratio," (1) interest on outstanding Indebtedness determined on a
fluctuating basis as of the Transaction Date and which will continue to be so
determined thereafter shall be deemed to have accrued at a fixed rate per annum
equal to the rate of interest on such Indebtedness in effect on the Transaction
Date; and (2) notwithstanding clause (1) above, interest on Indebtedness
determined on a fluctuating basis, to the extent such interest is covered by
agreements relating to Interest Swap Obligations, shall be deemed to accrue at
the rate per annum resulting after giving effect to the operation of such
agreements.

          "Consolidated Fixed Charges" means, with respect to any Person for any
           --------------------------
period, the sum, without duplication, of (i) Consolidated Interest Expense
(excluding (x) amortization or write-off of deferred financing costs, (y)
interest paid on Convertible Subordinated Notes in the form of Convertible
Subordinated Notes or Qualified Capital Stock and (z) one-time ac-

                                      -7-
<PAGE>

celerated interest payments due upon the conversion of the Convertible
Subordinated Notes prior to May 1, 2004) plus (ii) the product of (x) the amount
of all dividend payments on any series of Preferred Stock of such Person (other
than dividends paid in Qualified Capital Stock) paid, accrued or scheduled to be
paid or accrued during such period times (y) a fraction, the numerator of which
is one and the denominator of which is one minus the then current effective
consolidated federal, state and local tax rate of such Person, expressed as a
decimal.

          "Consolidated Interest Expense" means, with respect to any Person for
           -----------------------------
any period, the sum of, without duplication:  (i) the aggregate of the interest
expense of such Person and its Restricted Subsidiaries for such period
determined on a consolidated basis in accordance with GAAP, including, without
limitation, (a) any amortization of debt discount and amortization or write-off
of deferred financing costs (including the amortization of costs relating to
interest rate caps or other similar agreements), (b) the net costs under
Interest Swap Obligations, (c) all capitalized interest and (d) the interest
portion of any deferred payment obligation; and (ii) the interest component of
Capitalized Lease Obligations paid, accrued and/or scheduled to be paid or
accrued by such Person and its Restricted Subsidiaries during such period as
determined on a consolidated basis in accordance with GAAP, minus interest
income for such period.

          "Consolidated Net Income" means, with respect to any Person, for any
           -----------------------
period, the aggregate net income (or loss) of such Person and its Restricted
Subsidiaries for such period on a consolidated basis, determined in accordance
with GAAP; provided that there shall be excluded therefrom (a) after-tax gains
           --------
or losses from Asset Sales (without regard to the $1.5 million limitation set
forth in the definition thereof) or abandonments or reserves relating thereto,
(b) items classified as extraordinary, nonrecurring or unusual gains or losses
on an after-tax basis (including, but not limited to, fees and expenses related
to the Transactions and non-cash charges related to the acceleration of the
vesting of options), (c) the net income of any Person acquired in a "pooling of
interests" transaction accrued prior to the date it becomes a Restricted
Subsidiary of the referent Person or is merged or consolidated

                                      -8-
<PAGE>

with the referent Person or any Restricted Subsidiary of the referent Person,
(d) the net income (but not loss) of any Restricted Subsidiary of the referent
Person to the extent that the declaration of dividends and the making of loans
or advances or similar distributions, loans or advances by that Restricted
Subsidiary of that income is restricted by a contract, operation of law or
otherwise, (e) the net income of any Person, other than a Restricted Subsidiary
of the referent Person, except to the extent of cash dividends or distributions
paid to the referent Person or to a Wholly Owned Restricted Subsidiary of the
referent Person by such Person, (f) in the case of a successor to the referent
Person by consolidation or merger or as a transferee of the referent Person's
assets, any earnings of the successor corporation prior to such consolidation,
merger or transfer of assets and (g) the effect of changes in accounting
principles after the Issue Date.

          For purposes of Section 4.03 only, "Consolidated Net Income" shall be
calculated without taking into account cash interest payments (and the related
tax effects) on the Convertible Subordinated Notes.

          "Consolidated Non-cash Charges" means, with respect to any Person, for
           -----------------------------
any period, the aggregate depreciation, amortization and other non-cash expenses
of such Person and its Restricted Subsidiaries reducing Consolidated Net Income
of such Person and its Restricted Subsidiaries for such period, determined on a
consolidated basis in accordance with GAAP.

          "Convertible Subordinated Notes" means the $100 million aggregate
           ------------------------------
principal amount of the Company's 7 1/2% Convertible Junior Subordinated Notes
due 2012 and any additional Convertible Subordinated Notes issued in lieu of
cash interest thereon in accordance with the terms of the Convertible
Subordinated Notes as in effect on the Issue Date.

          "Covenant Defeasance" has the meaning set forth in Section 8.02.
           -------------------

          "Credit Agreement" means the Credit Agreement dated as of the Issue
           ----------------
Date, between the Company, the lenders party thereto in their capacities as
lenders thereunder, Goldman,

                                      -9-
<PAGE>

Sachs Credit Partners L.P., as documentation agent, Salomon Smith Barney Inc.,
as syndication agent, and Bankers Trust Company, as administrative agent,
together with the related documents thereto (including, without limitation, any
guarantee agreements and security documents), in each case as such agreements
may be amended (including any amendment and restatement thereof), supplemented
or otherwise modified from time to time, including any agreement extending the
maturity of, refinancing, replacing or otherwise restructuring (including
increasing the amount of available borrowings thereunder or adding Restricted
Subsidiaries of the Company as additional borrowers or guarantors thereunder)
all or any portion of the Indebtedness under such agreement or any successor or
replacement agreement and whether by the same or any other agent, lender or
group of lenders.

          "Credit Facilities" means one or more debt facilities (including,
           -----------------
without limitation, the Credit Agreement) or commercial paper facilities with
banks or other institutional lenders providing for revolving credit loans, term
loans, receivables financing (including through the sale of receivables to such
lenders or to special purpose entities formed to borrow from such lenders
against such receivables) and/or letters of credit or banker's acceptances.

          "Currency Agreement" means any foreign exchange contract, currency
           ------------------
swap agreement or other similar agreement or arrangement designed to protect the
Company or any Restricted Subsidiary of the Company against fluctuations in
currency values.

          "Custodian" means any receiver, trustee, assignee, liquidator,
           ---------
sequestrator or similar official under any Bankruptcy Law.

          "Default" means an event or condition the occurrence of which is, or
           -------
with the lapse of time or the giving of notice or both would be, an Event of
Default.

          "Depository" shall mean The Depository Trust Company, New York, New
           ----------
York, or a successor thereto registered under the Exchange Act or other
applicable statute or regulation.

                                     -10-
<PAGE>

          "Designated Senior Debt" means (i) Indebtedness under or in respect of
           ----------------------
the Credit Agreement and (ii) any other Indebtedness constituting Senior Debt
which, at the time of determination, has an aggregate principal amount of at
least $25.0 million and is specifically designated in the instrument evidencing
such Senior Debt as "Designated Senior Debt" by the Company.

          "Disqualified Capital Stock" means that portion of any Capital Stock
           --------------------------
which, by its terms (or by the terms of any security into which it is
convertible or for which it is exchangeable at the option of the holder
thereof), or upon the happening of any event (other than an event which would
constitute a Change of Control or Asset Sale), matures or is mandatorily
redeemable, pursuant to a sinking fund obligation or otherwise, or is redeemable
at the sole option of the holder thereof (except, in each case, upon the
occurrence of a Change of Control or Asset Sale), on or prior to the Maturity
Date of the Securities.

          "Domestic Restricted Subsidiary" means a Restricted Subsidiary
           ------------------------------
incorporated or otherwise organized or existing under the laws of the United
States, any state thereof or any territory or possession of the United States.

          "Equity Offering" means a public or private offering of Qualified
           ---------------
Capital Stock (other than public offerings with respect to the Company's Common
Stock on Form S-8 or any replacement form for such Form S-8) of the Company for
aggregate net cash proceeds to the Company of at least $20 million.

          "Event of Default" has the meaning set forth in Section 6.01.
           ----------------

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

          "Exchange Securities" means securities issued in exchange for the
           -------------------
Securities pursuant to the terms of the Registration Rights Agreement, or, in
the case of Securities issued after the Issue Date, any other registration
rights agreement.

                                     -11-
<PAGE>

          "fair market value" means, with respect to any asset or property, the
           -----------------
price which could be negotiated in an arm's-length, free market transaction
between a willing seller and a willing and able buyer, neither of whom is under
undue pressure or compulsion to complete the transaction.

          "GAAP" means 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 may be approved by a significant segment of the accounting
profession of the United States, which are in effect as of the Issue Date.

          "Global Security" shall mean one or more IAI Global Securities,
           ---------------
Regulation S Global Securities and 144A Global Securities.

          "Guarantee Obligations" has the meaning set forth in Section 12.01.
           ---------------------

          "Guarantees" means the guarantees of the Securities by the Guarantors.
           ----------

          "Guarantor" means (i) each of the Company's Restricted Subsidiaries as
           ---------
of the Issue Date and (ii) each of the Company's Restricted Subsidiaries that in
the future executes a supplemental indenture in which such Restricted Subsidiary
agrees to be bound by the terms of this Indenture as a Guarantor; provided that
                                                                  --------
any Person constituting a Guarantor as described above shall cease to constitute
a Guarantor when its respective Guarantee is released in accordance with the
terms of this Indenture.

          "Guarantor Senior Debt" means with respect to any Guarantor, the
           ---------------------
principal of, premium, if any, and interest (including any interest accruing
subsequent to the filing of a petition of bankruptcy at the rate provided for in
the documentation with respect thereto, whether or not such interest is an
allowed claim under applicable law) on any Indebtedness of such Guarantor,
whether outstanding on the Issue Date or thereafter

                                     -12-
<PAGE>

created, incurred or assumed, unless, in the case of any particular
Indebtedness, the instrument creating or evidencing the same or pursuant to
which the same is outstanding expressly provides that such Indebtedness shall
not be senior in right of payment to the Guarantee of such Guarantor. Without
limiting the generality of the foregoing, "Guarantor Senior Debt" shall also
include the principal of, premium, if any, interest (including any interest
accruing subsequent to the filing of a petition of bankruptcy at the rate
provided for in the documentation with respect thereto, whether or not such
interest is an allowed claim under applicable law) on, and all other amounts
owing in respect of, (x) all monetary obligations of every nature of such
Guarantor under, or with respect to, the Credit Agreement, including, without
limitation, obligations to pay principal and interest, reimbursement obligations
under letters of credit, fees, expenses and indemnities (including guarantees
thereof), (y) all Interest Swap Obligations (and guarantees thereof) and (z) all
obligations (and guarantees thereof) under Currency Agreements, in each case
whether outstanding on the Issue Date or thereafter incurred. Notwithstanding
the foregoing, "Guarantor Senior Debt" shall not include (i) any Indebtedness of
such Guarantor to a Subsidiary of such Guarantor, (ii) Indebtedness to, or
guaranteed on behalf of, any shareholder, director, officer or employee of such
Guarantor or any Subsidiary of such Guarantor (including, without limitation,
amounts owed for compensation) other than a shareholder who is also a lender (or
an Affiliate of a lender) under the Credit Facilities (including the Credit
Agreement), (iii) Indebtedness to trade creditors and other amounts incurred in
connection with obtaining goods, materials or services, (iv) Indebtedness
represented by Disqualified Capital Stock, (v) any liability for federal, state,
local or other taxes owed or owing by such Guarantor, (vi) that portion of any
Indebtedness incurred in violation of the provisions of Section 4.04 (but, as to
any such obligation, no such violation shall be deemed to exist for purposes of
this clause (vi) if the holder(s) of such obligation or their representative
shall have received an officers' certificate of the Company to the effect that
the incurrence of such Indebtedness does not (or, in the case of revolving
credit Indebtedness, that the incurrence of the entire committed amount thereof
at the date on which the initial borrowing thereunder is made would not) violate
such provisions of this

                                     -13-
<PAGE>

Indenture), (vii) Indebtedness which, when incurred and without respect to any
election under Section 1111(b) of Title 11, United States Code, is without
recourse to the Company and (viii) any Indebtedness which is, by its express
terms, subordinated in right of payment to any other Indebtedness of such
Guarantor.

          "incur" has the meaning set forth in Section 4.04.
           -----

          "Indebtedness" means with respect to any Person, without duplication,
           ------------
(i) all Obligations of such Person for borrowed money (including, without
limitation, Senior Debt), (ii) all Obligations of such Person evidenced by
bonds, debentures, notes or other similar instruments, (iii) all Capitalized
Lease Obligations of such Person, (iv) all Obligations of such Person issued or
assumed as the deferred purchase price of property, all conditional sale
obligations and all Obligations under any title retention agreement (but
excluding trade accounts payable and other accrued liabilities arising in the
ordinary course of business that are not overdue by 90 days or more or are being
contested in good faith by appropriate proceedings promptly instituted and
diligently conducted), (v) all Obligations for the reimbursement of any obligor
on any letter of credit, banker's acceptance or similar credit transaction, (vi)
guarantees and other contingent obligations in respect of Indebtedness referred
to in clauses (i) through (v) above and clause (viii) below, (vii) all
Obligations of any other Person of the type referred to in clauses (i) through
(vi) which are secured by any lien on any property or asset of such Person, the
amount of such Obligation being deemed to be the lesser of the fair market value
of such property or asset or the amount of the Obligation so secured, (viii) all
Obligations under currency agreements and interest swap agreements of such
Person and (ix) all Disqualified Capital Stock issued by such Person with the
amount of Indebtedness represented by such Disqualified Capital Stock being
equal to the greater of its voluntary or involuntary liquidation preference and
its maximum fixed repurchase price, but excluding accrued dividends, if any.
Notwithstanding anything to the contrary in this definition, Indebtedness shall
not include any contingent purchase price obligations or other earnout
obligations of the Company and its Restricted Subsidiaries in connection with
acquisitions, which

                                     -14-
<PAGE>

obligations are not required to be included as indebtedness on the face of the
Company's consolidated balance sheet in accordance with GAAP. For purposes
hereof, the "maximum fixed repurchase price" of any Disqualified Capital Stock
which does not have a fixed repurchase price shall be calculated in accordance
with the terms of such Disqualified Capital Stock as if such Disqualified
Capital Stock were purchased on any date on which Indebtedness shall be required
to be determined pursuant to this Indenture, and if such price is based upon, or
measured by, the fair market value of such Disqualified Capital Stock, such fair
market value shall be determined reasonably and in good faith by the Board of
Directors of the issuer of such Disqualified Capital Stock.

          "Indenture" means this Indenture, as amended or supplemented from time
           ---------
to time in accordance with the terms hereof.

          "Independent Financial Advisor" means a firm (i) which does not, and
           -----------------------------
whose directors, officers and employees or Affiliates do not, have a direct or
indirect financial interest in the Company and (ii) which, in the judgment of
the Board of Directors of the Company, is otherwise independent and qualified to
perform the task for which it is to be engaged.

          "Initial Purchasers" means BT Alex. Brown Incorporated, Bear, Stearns
           ------------------
& Co. Inc., Goldman, Sachs & Co., Salomon Smith Barney Inc., Friedman Billings
Ramsey & Co. Inc., Jefferies & Company, Inc. and Fleet Securities, Inc.

          "Institutional Accredited Investor" or "IAI" means an institution that
           ---------------------------------      ---
is an "accredited investor" as that term is defined in Rule 501(a)(1), (2), (3)
or (7) under the Securities Act.

          "Interest Payment Date" means the stated maturity of an installment of
           ---------------------
interest on the Securities.

          "Interest Swap Obligations" means the obligations of any Person
           -------------------------
pursuant to any arrangement with any other Person, whereby, directly or
indirectly, such Person is entitled to receive from time to time periodic
payments calculated by apply-

                                     -15-
<PAGE>

ing either a floating or a fixed rate of interest on a stated notional amount in
exchange for periodic payments made by such other Person calculated by applying
a fixed or a floating rate of interest on the same notional amount and shall
include, without limitation, interest rate swaps, caps, floors, collars and
similar agreements.

          "Investment" means, with respect to any Person, any direct or indirect
           ----------
loan or other extension of credit (including, without limitation, a guarantee)
or capital contribution to (by means of any transfer of cash or other property
to others or any payment for property or services for the account or use of
others), or any purchase or acquisition by such Person of any Capital Stock,
bonds, notes, debentures or other securities or evidences of Indebtedness issued
by, any Person.  "Investment" shall exclude extensions of trade credit by the
Company and its Restricted Subsidiaries on commercially reasonable terms in
accordance with normal trade practices of the Company or such Restricted
Subsidiary, as the case may be.

          For purposes of Section 4.03:  (1) "Investment" shall include and be
valued at the fair market value of the net assets of any Restricted Subsidiary
of the Company at the time that such Restricted Subsidiary is designated an
Unrestricted Subsidiary of the Company and shall exclude the fair market value
of the net assets of any Unrestricted Subsidiary of the Company at the time that
such Unrestricted Subsidiary is designated a Restricted Subsidiary of the
Company; and (2) the amount of any Investment shall be the original cost of such
Investment plus the cost of all additional Investments by the Company or any of
its Restricted Subsidiaries, without any adjustments for increases or decreases
in value, or write-ups, write-downs or write-offs with respect to such
Investment, reduced by the payment of dividends or distributions in connection
with such Investment or any other amounts received in respect of such
Investment; provided that no such payment of dividends or distributions or
            --------
receipt of any such other amounts shall reduce the amount of any Investment if
such payment of dividends or distributions or receipt of any such amounts would
be included in Consolidated Net Income.

                                     -16-
<PAGE>

          If the Company or any Restricted Subsidiary of the Company sells or
otherwise disposes of any Common Stock of any direct or indirect Restricted
Subsidiary of the Company such that, after giving effect to any such sale or
disposition, the Company no longer owns, directly or indirectly, 100% of the
outstanding Common Stock of such Restricted Subsidiary, the Company shall be
deemed to have made an Investment on the date of any such sale or disposition
equal to the fair market value of the Common Stock of such Restricted Subsidiary
not sold or disposed of.

          "Investors' Rights Agreement" means the Investors' Rights Agreement,
           ---------------------------
dated March 22, 1999, among the Company and certain of its investors.

          "Issue Date" means April 30, 1999, the date of original issuance of
           ----------
any Securities under this Indenture.

          "Legal Defeasance" has the meaning set forth in Section 8.02.
           ----------------

          "Lien" means any lien, mortgage, deed of trust, pledge, security
           ----
interest, charge or encumbrance of any kind (including any conditional sale or
other title retention agreement, any lease in the nature thereof and any
agreement to give any security interest).

          "Maturity Date" means May 1, 2009.
           -------------

          "Net Cash Proceeds" means, with respect to any Asset Sale, the
           -----------------
proceeds in the form of cash or Cash Equivalents including payments in respect
of deferred payment obligations when received in the form of cash or Cash
Equivalents (other than the portion of any such deferred payment constituting
interest) received by the Company or any of its Restricted Subsidiaries from
such Asset Sale net of (a) reasonable out-of-pocket expenses and fees relating
to such Asset Sale (including, without limitation, legal, accounting and
investment banking fees and sales commissions), (b) taxes paid or payable after
taking into account any reduction in consolidated tax liability due to available
tax credits or deductions and any tax sharing arrangements, (c) repayment of
Indebtedness that is re-

                                     -17-
<PAGE>

quired to be repaid in connection with such Asset Sale, (d) appropriate amounts
to be provided by the Company or any Restricted Subsidiary, as the case may be,
as a reserve, in accordance with GAAP, against any liabilities associated with
such Asset Sale and retained by the Company or any Restricted Subsidiary, as the
case may be, after such Asset Sale, including, without limitation, pension and
other post-employment benefit liabilities, liabilities related to environmental
matters and liabilities under any indemnification obligations associated with
such Asset Sale, and (e) all distributions and other payments required to be
made to minority interest holders in Restricted Subsidiaries or joint ventures
as a result of such Asset Sale.

          "Net Proceeds Offer" has the meaning set forth in Section 4.16.
           ------------------

          "Net Proceeds Offer Amount" has the meaning set forth in Section 4.16.
           -------------------------

          "Net Proceeds Offer Payment Date" has the meaning set forth in Section
           -------------------------------
4.16.

          "Net Proceeds Offer Trigger Date" has the meaning set forth in Section
           -------------------------------
4.16.

          "Non-payment Default" has the meaning set forth in Section 10.02.
           -------------------

          "Non-U.S. Person" has the meaning assigned to such term in Regulation
           ---------------
S.

          "Obligations" means all obligations for principal, premium, interest,
           -----------
penalties, fees, indemnifications, reimbursements, damages and other liabilities
payable under the documentation governing any Indebtedness.

          "Officer" means, with respect to any Person, the Chairman of the
           -------
Board, the Chief Executive Officer, the President, any Vice President, the Chief
Financial Officer, the Controller, or the Secretary of such Person.

                                     -18-
<PAGE>

          "Officers' Certificate" means a certificate signed by two Officers of
           ---------------------
the Company.

          "144A Global Security" means a permanent global security in registered
           --------------------
form representing the aggregate principal amount of Securities sold in reliance
on Rule 144A under the Securities Act.

          "Opinion of Counsel" means a written opinion from legal counsel which
           ------------------
opinion and counsel are reasonably acceptable to the Trustee.

          "Participants" has the meaning set forth in Section 2.15.
           ------------

          "Paying Agent" has the meaning set forth in Section 2.03.
           ------------

          "Payment Blockage Notice" has the meaning set forth in Section 10.02.
           -----------------------

          "Payment Blockage Period" has the meaning set forth in Section 10.02.
           -----------------------

          "Payment Default" has the meaning set forth in Section 10.02.
           ---------------

          "Permitted Holders" means Apollo Management, L.P. and its Affiliates
           -----------------
and management of the Company.

          "Permitted Indebtedness" means, without duplication, each of the
           ----------------------
following:

            (i)   Indebtedness under the Securities and the Guarantees issued on
     the Issue Date in an aggregate principal amount not to exceed $200 million;

            (ii)  Indebtedness incurred pursuant to the Credit Agreement in an
     aggregate principal amount at any time outstanding not to exceed $375.0
     million less the amount of all repayments and permanent commitment
     reductions under the Credit Agreement with the Net Cash Proceeds of an
     Asset Sale applied thereto as required by Section 4.16;

                                     -19-
<PAGE>

     provided that the amount of Indebtedness permitted to be incurred pursuant
     --------
     to the Credit Agreement in accordance with this clause (ii) shall be in
     addition to any Indebtedness permitted to be incurred pursuant to the
     Credit Agreement in reliance on and in accordance with clause (xvi) below;
     provided, further, that the aggregate principal amount of Indebtedness
     --------  -------
     permitted to be incurred under this clause (ii) shall be reduced dollar for
     dollar by any Indebtedness outstanding under clause (xv) below;

            (iii)  Indebtedness under the Convertible Subordinated Notes reduced
     by any principal payments or conversions thereof;

            (iv)   other Indebtedness of the Company and its Restricted
     Subsidiaries outstanding on the Issue Date reduced by the amount of any
     scheduled amortization payments or mandatory prepayments when actually paid
     or permanent reductions thereon;

            (v)    Interest Swap Obligations of the Company or any Restricted
     Subsidiary of the Company covering Indebtedness of the Company or any of
     its Restricted Subsidiaries; provided, however, that such Interest Swap
                                  --------  -------
     Obligations are entered into to protect the Company and its Restricted
     Subsidiaries from fluctuations in interest rates on their outstanding
     Indebtedness to the extent the notional principal amount of such Interest
     Swap Obligations does not, at the time of the incurrence thereof, exceed
     the principal amount of the Indebtedness to which such Interest Swap
     Obligations relate;

            (vi)   Indebtedness under Currency Agreements; provided that in the
                                                           --------
     case of Currency Agreements which relate to Indebtedness, such Currency
     Agreements do not increase the Indebtedness of the Company and its
     Restricted Subsidiaries outstanding other than as a result of fluctuations
     in foreign currency exchange rates or by reason of fees, indemnities and
     compensation payable thereunder;

            (vii)  Indebtedness of a Restricted Subsidiary of the Company to the
     Company or to a Wholly Owned Restricted

                                     -20-
<PAGE>

     Subsidiary of the Company for so long as such Indebtedness is held by the
     Company, a Wholly Owned Restricted Subsidiary of the Company or the lenders
     or collateral agent under the Credit Agreement, in each case subject to no
     Lien held by a Person other than the Company, a Wholly Owned Restricted
     Subsidiary of the Company or the lenders or collateral agent under the
     Credit Agreement; provided that if as of any date any Person other than the
                       --------
     Company, a Wholly Owned Restricted Subsidiary of the Company or the lenders
     or collateral agent under the Credit Agreement owns or holds any such
     Indebtedness or holds a Lien in respect of such Indebtedness, such date
     shall be deemed the incurrence of Indebtedness not constituting Permitted
     Indebtedness by the issuer of such Indebtedness;

            (viii)  Indebtedness of the Company to a Wholly Owned Restricted
     Subsidiary of the Company or the lenders or collateral agent under the
     Credit Agreement for so long as such Indebtedness is held by a Wholly Owned
     Restricted Subsidiary of the Company or the lenders or collateral agent
     under the Credit Agreement in each case subject to no other Lien; provided
                                                                       --------
     that (a) any Indebtedness of the Company to any Wholly Owned Restricted
     Subsidiary of the Company is unsecured and subordinated, pursuant to a
     written agreement, to the Company's obligations under this Indenture and
     the Securities and (b) if as of any date any Person other than a Wholly
     Owned Restricted Subsidiary of the Company or the lenders or collateral
     agent under the Credit Agreement owns or holds any such Indebtedness or any
     Person holds a Lien (other than a Lien in favor of the lenders or
     collateral agent under the Credit Agreement) in respect of such
     Indebtedness, such date shall be deemed the incurrence of Indebtedness not
     constituting Permitted Indebtedness by the Company;

            (ix) Indebtedness arising from the honoring by a bank or other
     financial institution of a check, draft or similar instrument inadvertently
     (except in the case of daylight overdrafts) drawn against insufficient
     funds in the ordinary course of business; provided, however, that such
                                               --------  -------
     Indebtedness is extinguished within two business days of incurrence;

                                     -21-
<PAGE>

            (x)   Indebtedness of the Company or any of its Restricted
     Subsidiaries represented by letters of credit for the account of the
     Company or such Restricted Subsidiary, as the case may be, in order to
     provide security for workers' compensation claims, payment obligations in
     connection with self-insurance or similar requirements in the ordinary
     course of business;

            (xi)  Indebtedness represented by Capitalized Lease Obligations and
     Purchase Money Indebtedness of the Company and its Restricted Subsidiaries
     incurred in the ordinary course of business not to exceed $20.0 million at
     any one time outstanding; provided that all or a portion of the $20 million
                               --------
     permitted to be incurred pursuant to this clause (xi) may, at the option of
     the Company, be incurred under the Credit Agreement instead of pursuant to
     Capitalized Lease Obligations or Purchase Money Indebtedness;

            (xii) Indebtedness arising from agreements of the Company or a
     Restricted Subsidiary of the Company providing for indemnification,
     adjustment of purchase price or similar obligations, in each case, incurred
     or assumed in connection with the disposition of any business, assets or a
     Subsidiary, other than guarantees of Indebtedness incurred by any Person
     acquiring all or any portion of such business, assets or a Subsidiary for
     the purpose of financing such acquisition; provided, however, that (a) such
                                                --------  -------
     Indebtedness is not reflected on the balance sheet of the Company or any
     Restricted Subsidiary of the Company (contingent obligations referred to in
     a footnote to financial statements and not otherwise reflected on the
     balance sheet will not be deemed to be reflected on such balance sheet for
     purposes of this clause (a)) and (b) the maximum assumable liability in
     respect of all such Indebtedness shall at no time exceed the gross proceeds
     including non-cash proceeds (the fair market value of such non-cash
     proceeds being measured at the time it is received and without giving
     effect to any subsequent changes in value) actually received by the Company
     and its Restricted Subsidiaries in connection with such disposition;

                                     -22-
<PAGE>

            (xiii)  Indebtedness of the Company or any of its Restricted
     Subsidiaries in respect of performance bonds, bankers' acceptances,
     workers' compensation claims, surety or appeal bonds, payment obligations
     in connection with self-insurance or similar obligations, and bank
     overdrafts (and letters of credit in respect thereof);

            (xiv)  Refinancing Indebtedness;

            (xv)   the incurrence by a Receivables Subsidiary of Indebtedness in
     a Qualified Receivables Transaction that is without recourse to the Company
     or to any Restricted Subsidiary of the Company or their assets (other than
     such Receivables Subsidiary and its assets), and is not guaranteed by any
     such Person; provided that any outstanding Indebtedness incurred under this
                  --------
     clause (xv) shall reduce the aggregate amount permitted to be incurred
     under clause (ii) above to the extent set forth therein; and

            (xvi)  additional Indebtedness of the Company and its Restricted
     Subsidiaries in an aggregate principal amount not to exceed $20.0 million
     at any one time outstanding (which amount may, but need not, be incurred in
     whole or in part under the Credit Agreement).

          For purposes of determining compliance with Section 4.04, in the event
that an item of Indebtedness meets the criteria of more than one of the
categories of Permitted Indebtedness described in clauses (i) through (xvi)
above or is entitled to be incurred pursuant to the Consolidated Fixed Charge
Coverage Ratio provisions of Section 4.04, the Company shall, in its sole
discretion, classify (or later reclassify) such item of Indebtedness in any
manner that complies with Section 4.04.  Accrual of interest, accretion or
amortization of original issue discount, the payment of interest on any
Indebtedness in the form of additional Indebtedness with the same terms, and the
payment of dividends on Disqualified Capital Stock in the form of additional
shares of the same class of Disqualified Capital Stock will not be deemed to be
an incurrence of Indebtedness or an issuance of Disqualified Capital Stock for
purposes of Section 4.04.

                                     -23-
<PAGE>

          "Permitted Investments" means:
           ---------------------

          (i)   Investments by the Company or any Restricted Subsidiary of the
Company in any Person that is or will become immediately after such Investment a
Wholly Owned Restricted Subsidiary of the Company or that will merge or
consolidate into the Company or a Wholly Owned Restricted Subsidiary of the
Company;

          (ii)   Investments in the Company by any Restricted Subsidiary of the
Company; provided that any Indebtedness evidencing such Investment is unsecured
         --------
and subordinated, pursuant to a written agreement, to the Company's obligations
under the Securities and this Indenture;

          (iii)  Investments in cash and Cash Equivalents;

          (iv)   loans and advances to employees and officers of the Company and
its Restricted Subsidiaries in the ordinary course of business for bona fide
business purposes not in excess of $5.0 million at any one time outstanding;

          (v)    Currency Agreements and Interest Swap Obligations entered into
in the ordinary course of the Company's or its Restricted Subsidiaries'
businesses and otherwise in compliance with this Indenture;

          (vi)   additional Investments (including joint ventures) not to exceed
$10.0 million at any one time outstanding;

          (vii)  Investments in securities of trade creditors or customers
received pursuant to any plan of reorganization or similar arrangement upon the
bankruptcy or insolvency of such trade creditors or customers;

          (viii) Investments made by the Company or its Restricted Subsidiaries
as a result of consideration received in connection with an Asset Sale made in
compliance with Section 4.16 or any Investment made by the Company or any
Restricted Subsidiary in connection with a transaction that would be an Asset
Sale if it involved aggregate consideration of $1.5 million or more;

                                     -24-
<PAGE>

          (ix)   Investments of a Person or any of its Subsidiaries existing at
the time such Person becomes a Restricted Subsidiary of the Company or at the
time such Person merges or consolidates with the Company or any of its
Restricted Subsidiaries, in either case in compliance with this Indenture;
provided that such Investments were not made by such Person in connection with,
--------
or in anticipation or contemplation of, such Person becoming a Restricted
Subsidiary of the Company or such merger or consolidation;

          (x)    repurchases of Capital Stock of the Company deemed to occur
upon the exercise of stock options if such Capital Stock represents a portion of
the exercise price thereof;

          (xi)   Investments made by the Company or any Restricted Subsidiary in
connection with purchase price adjustments, contingent purchase price payments
or other earnout payments required in connection with Investments otherwise
permitted under this Indenture;

          (xii)  Investments in securities received in settlement of trade
obligations in the ordinary course of business; and

          (xiii) Investments in the Securities.


          "Permitted Liens" means the following types of Liens:
           ---------------

            (i)   Liens for taxes, assessments or governmental charges or claims
     either (a) not delinquent or (b) contested in good faith by appropriate
     proceedings and as to which the Company or its Restricted Subsidiaries
     shall have set aside on its books such reserves as may be required pursuant
     to GAAP;

            (ii)  statutory Liens of landlords and Liens of carriers,
     warehousemen, mechanics, suppliers, materialmen, repairmen and other Liens
     imposed by law incurred in the ordinary course of business for sums not yet
     delinquent or being contested in good faith, if such reserve or other
     appropriate provision, if any, as shall be required by GAAP shall have been
     made in respect thereof;

                                     -25-
<PAGE>

            (iii) Liens incurred or deposits made in the ordinary course of
     business in connection with workers' compensation, unemployment insurance
     and other types of social security, including any Lien securing letters of
     credit issued in the ordinary course of business consistent with past
     practice in connection therewith, or to secure the performance of tenders,
     statutory obligations, surety and appeal bonds, bids, leases, government
     contracts, performance and return-of-money bonds and other similar
     obligations (exclusive of obligations for the payment of borrowed money);

            (iv)  judgment Liens not giving rise to an Event of Default so long
     as such Lien is adequately bonded and any appropriate legal proceedings
     which may have been duly initiated for the review of such judgment shall
     not have been finally terminated or the period within which such
     proceedings may be initiated shall not have expired;

            (v)   easements, rights-of-way, zoning restrictions and other
     similar charges or encumbrances in respect of real property not interfering
     in any material respect with the ordinary conduct of the business of the
     Company or any of its Restricted Subsidiaries;

            (vi)  any interest or title of a lessor under any Capitalized Lease
     Obligation; provided that such Liens do not extend to any property or asset
                 --------
     which is not leased property subject to such Capitalized Lease Obligation;

            (vii) Liens securing Capitalized Lease Obligations and Purchase
     Money Indebtedness permitted pursuant to clause (xi) of the definition of
     "Permitted Indebtedness" above; provided, however, that in the case of
                                     --------  -------
     Purchase Money Indebtedness (a) the Indebtedness shall not exceed the cost
     of such property or assets and shall not be secured by any property or
     assets of the Company or any Restricted Subsidiary of the Company other
     than the property and assets so acquired and (b) the Lien securing such
     Indebtedness shall be created within 180 days of such acquisition or
     construction or, in the case of a refinancing of any Pur-

                                     -26-
<PAGE>

     chase Money Indebtedness, within 180 days of such refinancing;

            (viii) Liens upon specific items of inventory or other goods and
     proceeds of any Person securing such Person's obligations in respect of
     bankers' acceptances issued or created for the account of such Person to
     facilitate the purchase, shipment or storage of such inventory or other
     goods;

            (ix)   Liens securing reimbursement obligations with respect to
     commercial letters of credit which encumber documents and other property
     relating to such letters of credit and products and proceeds thereof;

            (x)    Liens encumbering deposits made to secure obligations arising
     from statutory, regulatory, contractual, or warranty requirements of the
     Company or any of its Restricted Subsidiaries, including rights of offset
     and set-off;

            (xi)   Liens securing Interest Swap Obligations which Interest Swap
     Obligations relate to Indebtedness that is otherwise permitted under this
     Indenture;

            (xii)  Liens in the ordinary course of business not exceeding $5
     million at any one time outstanding that (a) are not incurred in connection
     with borrowing of money and (b) do not materially detract from the value of
     the property or materially impair its use;

            (xiii) Liens by reason of judgment or decree not otherwise
     resulting in an Event of Default;

            (xiv)  Liens securing Indebtedness under Currency Agreements
     permitted under this Indenture;

            (xv)   Liens securing Acquired Indebtedness incurred in accordance
     with Section 4.04; provided that: (a) such Liens secured such Acquired
                        --------
     Indebtedness at the time of and prior to the incurrence of such Acquired
     Indebtedness by the Company or a Restricted Subsidiary of the Company and
     were not granted in connection with, or in anticipa-

                                     -27-
<PAGE>

     tion of, the incurrence of such Acquired Indebtedness by the Company or a
     Restricted Subsidiary of the Company; and (b) such Liens do not extend to
     or cover any property or assets of the Company or any of its Restricted
     Subsidiaries other than the property or assets that secured the Acquired
     Indebtedness prior to the time such Indebtedness became Acquired
     Indebtedness of the Company or a Restricted Subsidiary of the Company and
     are no more favorable to the lienholders than those securing the Acquired
     Indebtedness prior to the incurrence of such Acquired Indebtedness by the
     Company or a Restricted Subsidiary of the Company; and

            (xvi)  Liens securing Indebtedness permitted to be incurred pursuant
     to clause (xvi) of the definition of "Permitted Indebtedness."

          "Person" means an individual, partnership, corporation, limited
           ------
liability company, unincorporated organization, trust or joint venture, or a
governmental agency or political subdivision thereof.

          "Physical Securities" shall have the meaning provided in Section 2.01.
           -------------------

          "Preferred Stock" of any Person means any Capital Stock of such Person
           ---------------
that has preferential rights to any other Capital Stock of such Person with
respect to dividends or redemptions or upon liquidation.

          "principal" of any Indebtedness (including the Securities) means the
           ---------
principal amount of such Indebtedness plus the premium, if any, on such
Indebtedness.

          "Private Placement Legend" means the legends initially set forth on
           ------------------------
the Securities in the form set forth in Exhibit B.
                                        ---------

          "Purchase Money Indebtedness" means Indebtedness of the Company and
           ---------------------------
its Restricted Subsidiaries incurred in the normal course of business for the
purpose of financing all or any part of the purchase price, or the cost of
installation,

                                     -28-
<PAGE>

construction or improvement, of property or equipment and any Refinancings
thereof.

          "Qualified Capital Stock" means any Capital Stock that is not
           -----------------------
Disqualified Capital Stock.

          "Qualified Institutional Buyer" or "QIB" shall have the meaning
           -----------------------------      ---
specified in Rule 144A under the Securities Act.

          "Qualified Receivables Transaction" means any transaction or series of
           ---------------------------------
transactions that may be entered into by the Company or any of its Restricted
Subsidiaries pursuant to which the Company or any of its Restricted Subsidiaries
may sell, convey or otherwise transfer to (i) a Receivables Subsidiary (in the
case of a transfer by the Company or any of its Restricted Subsidiaries) and
(ii) any other Person (in the case of transfer by a Receivables Subsidiary), or
may grant a security interest in, any accounts receivable (whether now existing
or arising in the future) of the Company or any of its Restricted Subsidiaries,
and any assets related thereto, including, without limitation, all collateral
securing such accounts receivable, all contracts and all guarantees or other
obligations in respect of such accounts receivable, proceeds of such accounts
receivable and other assets which are customarily transferred or in respect of
which security interests are customarily granted in connection with asset
securitization transactions involving accounts receivable.

          "Receivables Subsidiary" means a Wholly Owned Restricted Subsidiary of
           ----------------------
the Company that engages in no activities other than in connection with the
financing of accounts receivable and that is designated by the Board of
Directors of the Company (as provided below) as a Receivables Subsidiary (a) no
portion of the Indebtedness or any other Obligations (contingent or otherwise)
of which (i) is guaranteed by the Company or any Restricted Subsidiary of the
Company (excluding guarantees of Obligations (other than the principal of, and
interest on, Indebtedness) pursuant to representations, warranties, covenants
and indemnities entered into in the ordinary course of business in connection
with a Qualified Receivables Transaction), (ii) is recourse to or obligates the
Company or any Restricted Subsidiary of the Company in any way other than

                                     -29-
<PAGE>

pursuant to representations, warranties, covenants and indemnities entered into
in the ordinary course of business in connection with a Qualified Receivables
Transaction, or (iii) subjects any property or asset of the Company or any
Restricted Subsidiary of the Company, directly or indirectly, contingently or
otherwise, to the satisfaction thereof, other than pursuant to representations,
warranties, covenants and indemnities entered into in the ordinary course of
business in connection with a Qualified Receivables Transaction, (b) with which
neither the Company nor any Restricted Subsidiary of the Company has any
material contract, agreement, arrangement or understanding other than on terms
no less favorable to the Company or such Restricted Subsidiary than those that
might be obtained at the time from Persons who are not Affiliates of the
Company, other than fees payable in the ordinary course of business in
connection with servicing accounts receivable, and (c) with which neither the
Company nor any Restricted Subsidiary of the Company has any obligation to
maintain or preserve such Restricted Subsidiary's financial condition or cause
such Restricted Subsidiary to achieve certain levels of operating results.  Any
such designation by the Board of Directors of the Company shall be evidenced to
the Trustee by filing with the Trustee a Board Resolution giving effect to such
designation and an Officers' Certificate certifying that such designation
complied with the foregoing conditions.

          "Record Date" means the applicable Record Date specified in the
           -----------
Securities; provided that if any such date is not a Business Day, the Record
            --------
Date shall be the first day immediately preceding such specified day that is a
Business Day.

          "Redemption Date," when used with respect to any Security to be
           ---------------
redeemed, means the date fixed for such redemption pursuant to this Indenture
and the Securities.

          "Redemption Price," when used with respect to any Security to be
           ----------------
redeemed, means the price fixed for such redemption, payable in immediately
available funds, pursuant to this Indenture and the Securities.

          "Reference Date" has the meaning set forth in Section 4.03.
           --------------

                                     -30-
<PAGE>

          "Refinance" means, in respect of any security or Indebtedness, to
           ---------
refinance, extend, renew, refund, repay, prepay, redeem, defease or retire, or
to issue a security or Indebtedness in exchange or replacement for, such
security or Indebtedness in whole or in part.  "Refinanced" and "Refinancing"
shall have correlative meanings.

          "Refinancing Indebtedness" means any Refinancing by the Company or any
           ------------------------
Restricted Subsidiary of the Company of Indebtedness incurred or existing in
accordance with Section 4.04 (other than pursuant to clause (ii), (v), (vi),
(vii), (viii), (ix), (x), (xi), (xii), (xiii), (xv) or (xvi) of the definition
of "Permitted Indebtedness"), in each case that does not (1) result in an
increase in the aggregate principal amount of Indebtedness of such Person as of
the date of such proposed Refinancing (plus the amount of any premium required
to be paid under the terms of the instrument governing such Indebtedness and
plus the amount of reasonable expenses incurred by the Company in connection
with such Refinancing) or (2) create Indebtedness with (A) a Weighted Average
Life to Maturity that is less than the Weighted Average Life to Maturity of the
Indebtedness being Refinanced or (B) a final maturity earlier than the final
maturity of the Indebtedness being Refinanced; provided that (x) if such
                                               --------
Indebtedness being Refinanced is Indebtedness of the Company, then such
Refinancing Indebtedness shall be Indebtedness solely of the Company and (y) if
such Indebtedness being Refinanced is subordinate or junior to the Securities,
then such Refinancing Indebtedness shall be subordinate to the Securities at
least to the same extent and in the same manner as the Indebtedness being
Refinanced.

          "Registrar" has the meaning set forth in Section 2.03.
           ---------

          "Registration Rights Agreement" means the Registration Rights
           -----------------------------
Agreement dated as of the Issue Date among the Company, the Guarantors and the
Initial Purchasers.

          "Regulation S" means Regulation S under the Securities Act.
           ------------

                                     -31-
<PAGE>

          "Regulation S Global Security" means a permanent global security in
           ----------------------------
registered form representing the aggregate principal amount of Securities sold
in reliance on Regulation S under the Securities Act.

          "Replacement Assets" has the meaning set forth in Section 4.16.
           ------------------

          "Representative" means the indenture trustee or other trustee, agent
           --------------
or representative in respect of any Designated Senior Debt; provided that if,
                                                            --------
and for so long as, any Designated Senior Debt lacks such a representative, then
the Representative for such Designated Senior Debt shall at all times constitute
the holders of a majority in outstanding principal amount of such Designated
Senior Debt in respect of any Designated Senior Debt.

          "Responsible Officer" means, when used with respect to the Trustee,
           -------------------
any officer in the Corporate Trust Office of the Trustee including any vice
president, assistant vice president, assistant secretary, treasurer, assistant
treasurer, or any other officer of the Trustee who customarily performs
functions similar to those performed by the Persons who at the time shall be
such officers, respectively, or to whom any corporate trust matter is referred
because of such officer's knowledge of and familiarity with the particular
subject.

          "Restricted Payment" has the meaning set forth in Section 4.03.
           ------------------

          "Restricted Security" means a Security that constitutes a "Restricted
           -------------------
Security" within the meaning of Rule 144(a)(3) under the Securities Act;
provided, however, that the Trustee shall be entitled to request and
--------  -------
conclusively rely on an Opinion of Counsel with respect to whether any Security
constitutes a Restricted Security.

          "Restricted Subsidiary" of any Person means any Subsidiary of such
           ---------------------
Person which at the time of determination is not an Unrestricted Subsidiary.

          "Rule 144A" means Rule 144A under the Securities Act.
           ---------

                                     -32-
<PAGE>

          "Sale and Leaseback Transaction" means any direct or indirect
           ------------------------------
arrangement with any Person or to which any such Person is a party, providing
for the leasing to the Company or a Restricted Subsidiary of any property,
whether owned by the Company or any Restricted Subsidiary at the Issue Date or
later acquired, which has been or is to be sold or transferred by the Company or
such Restricted Subsidiary to such Person or to any other Person from whom funds
have been or are to be advanced by such Person on the security of such property.

          "Securities" means, collectively, the Company's 10 1/2% Senior
           ----------
Subordinated Notes due 2009 issued in accordance with Section 2.02 (whether on
the Issue Date or thereafter) treated as a single class of securities under this
Indenture, as amended or supplemented from time to time in accordance with the
terms of this Indenture.

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

          "Securities Purchase Agreement" means the Securities Purchase
           -----------------------------
Agreement, dated as of March 22, 1999, between Boss Investment, LLC and the
Company.

          "Securityholder" or "Holder" means the Person in whose name a Security
           --------------      ------
is registered on the Registrar's books.

          "Senior Debt" means the principal of, premium, if any, and interest
           -----------
(including any interest accruing subsequent to the filing of a petition of
bankruptcy at the rate provided for in the documentation with respect thereto,
whether or not such interest is an allowed claim under applicable law) on any
Indebtedness of the Company, whether outstanding on the Issue Date or thereafter
created, incurred or assumed, unless, in the case of any particular
Indebtedness, the instrument creating or evidencing the same or pursuant to
which the same is outstanding expressly provides that such Indebtedness shall
not be senior in right of payment to the Securities.  Without limiting the
generality of the foregoing, "Senior Debt" shall also include the principal of,
premium, if any, interest (including any interest accruing subsequent to the
filing of a petition of bankruptcy at the rate provided for in the documentation
with

                                     -33-
<PAGE>

respect thereto, whether or not such interest is an allowed claim under
applicable law) on, and all other amounts owing by the Company in respect of,
(i) all monetary obligations of every nature of the Company under, or with
respect to, the Credit Agreement, including, without limitation, obligations to
pay principal and interest, reimbursement obligations under letters of credit,
fees, expenses and indemnities, (ii) all Interest Swap Obligations (including
guarantees thereof) and (iii) all obligations under Currency Agreements
(including guarantees thereof), in each case whether outstanding on the Issue
Date or thereafter incurred.  Notwithstanding the foregoing, "Senior Debt" shall
not include (i) any Indebtedness of the Company to a Subsidiary of the Company,
(ii) Indebtedness to, or guaranteed on behalf of, any shareholder, director,
officer or employee of the Company or any Subsidiary of the Company (including,
without limitation, amounts owed for compensation) other than a shareholder who
is a lender (or an Affiliate of a lender) under the Credit Facilities (including
the Credit Agreement), (iii) Indebtedness to trade creditors and other amounts
incurred in connection with obtaining goods, materials or services, (iv)
Indebtedness represented by Disqualified Capital Stock, (v) any liability for
federal, state, local or other taxes owed or owing by the Company, (vi) that
portion of any Indebtedness incurred in violation of Section 4.04 (but, as to
any such obligation, no such violation shall be deemed to exist for purposes of
this clause (vi) if the holder(s) of such obligation or their representative
shall have received an Officers' Certificate of the Company to the effect that
the incurrence of such Indebtedness does not (or, in the case of revolving
credit Indebtedness, that the incurrence of the entire committed amount thereof
at the date on which the initial borrowing thereunder is made would not) violate
such provisions of this Indenture), (vii) Indebtedness represented by the
Convertible Subordinated Notes, (viii) Indebtedness which, when incurred and
without respect to any election under Section 1111(b) of Title 11, United States
Code, is without recourse to the Company and (ix) any Indebtedness which is, by
its express terms, subordinated in right of payment to any other Indebtedness of
the Company.

          "Significant Subsidiary," with respect to any Person, means any
           ----------------------
Restricted Subsidiary of such Person that satisfies

                                     -34-
<PAGE>

the criteria for a "significant subsidiary" set forth in Rule 1.02(w) of
Regulation S-X under the Exchange Act based upon the most recent pro forma
                                                                 --- -----
annual financial information filed by the Company with the Commission.

          "Subsidiary," with respect to any Person, means (i) any corporation of
           ----------
which the outstanding Capital Stock having at least a majority of the votes
entitled to be cast in the election of directors under ordinary circumstances
shall at the time be owned, directly or indirectly, by such Person or (ii) any
other Person of which at least a majority of the voting interest under ordinary
circumstances is at the time, directly or indirectly, owned by such Person.

          "Surviving Entity" has the meaning set forth in Section 5.01.
           ----------------

          "Tender Offer" means (i) the purchase of the Company's common stock,
           ------------
including shares underlying certain options, pursuant to the Company's offer to
purchase dated February 19, 1999, as amended through the Issue Date or (ii) to
the extent that the Company has not purchased an aggregate of 25.5 million
shares of its common stock, including shares underlying options, pursuant to the
offer to purchase described in clause (i), any other purchase of the Company's
common stock or shares underlying options to purchase the Company's common stock
within 180 days of the Issue Date, provided that the aggregate amount expended
                                   --------
pursuant to clauses (i) and (ii) shall not exceed $573.75 million.

          "TIA" means the Trust Indenture act of 1939 (15 U.S.C. (S)(S) 77aaa-
           ---
77bbbb), as amended, as in effect on the date of the execution of this Indenture
until such time as this Indenture is qualified under the TIA, and thereafter as
in effect on the date on which this Indenture is qualified under the TIA, except
as otherwise provided in Section 9.03.

          "Trust Officer" means any officer or assistant officer of the Trustee
           -------------
assigned by the Trustee to administer its corporate trust matters or, in the
case of a successor trustee, an officer assigned to the department, division or
group performing the corporate trust work of such successor.

                                     -35-
<PAGE>

          "Trustee" means the party named as such in this Indenture until a
           -------
successor replaces it in accordance with the provisions of this Indenture and
thereafter means such successor.

          "Unrestricted Securities" means one or more Securities that do not and
           -----------------------
are not required to bear the Private Placement Legend in the form set forth in
Exhibit B, including, without limitation, the Exchange Securities.
---------

          "Unrestricted Subsidiary" of any Person means (i) any Subsidiary of
           -----------------------
such Person that at the time of determination shall be or continue to be
designated an Unrestricted Subsidiary by the Board of Directors of such Person
in the manner provided below and (ii) any Subsidiary of an Unrestricted
Subsidiary.  The Board of Directors may designate any Subsidiary (including any
newly acquired or newly formed Subsidiary) to be an Unrestricted Subsidiary
unless such Subsidiary owns any Capital Stock of, or owns or holds any Lien on
any property of, the Company or any other Subsidiary of the Company that is not
a Subsidiary of the Subsidiary to be so designated; provided that (x) the
                                                    --------
Company certifies to the Trustee that such designation complies with Section
4.03 and (y) each Subsidiary to be so designated and each of its Subsidiaries
has not at the time of designation, and does not thereafter, create, incur,
issue, assume, guarantee or otherwise become directly or indirectly liable with
respect to any Indebtedness pursuant to which the lender has recourse to any of
the assets of the Company or any of its Restricted Subsidiaries.  The Board of
Directors may designate any Unrestricted Subsidiary to be a Restricted
Subsidiary only if (x) immediately after giving effect to such designation, the
Company is able to incur at least $1.00 of additional Indebtedness (other than
Permitted Indebtedness) in compliance with Section 4.04 and (y) immediately
before and immediately after giving effect to such designation, no Default or
Event of Default shall have occurred and be continuing.  Any such designation by
the Board of Directors shall be evidenced to the Trustee by promptly filing with
the Trustee a copy of the Board Resolution giving effect to such designation and
an Officers' Certificate certifying that such designation complied with the
foregoing provisions.

                                     -36-
<PAGE>

          "U.S. Government Obligations" means direct obligations of, and
           ---------------------------
obligations guaranteed by, the United States of America for the payment of which
the full faith and credit of the United States of America is pledged and which
are not callable or redeemable at the issuer's option.

          "U.S. Legal Tender" means such coin or currency of the United States
           -----------------
of America as at the time of payment shall be legal tender for the payment of
public and private debts.

          "Weighted Average Life to Maturity" means, when applied to any
           ---------------------------------
Indebtedness at any date, the number of years obtained by dividing (a) the then
outstanding aggregate principal amount of such Indebtedness into (b) the sum of
the total of the products obtained by multiplying (i) the amount of each then
remaining installment, sinking fund, serial maturity or other required payment
of principal, including payment at final maturity, in respect thereof, by (ii)
the number of years (calculated to the nearest one-twelfth) which will elapse
between such date and the making of such payment.

          "Wholly Owned Restricted Subsidiary" of any Person means any Wholly
           ----------------------------------
Owned Subsidiary of such Person which at the time of determination is a
Restricted Subsidiary of such Person.

          "Wholly Owned Subsidiary" of any Person means any Subsidiary of such
           -----------------------
Person of which all the outstanding voting securities (other than in the case of
a foreign Subsidiary, directors' qualifying shares or an immaterial amount of
shares required to be owned by other Persons pursuant to applicable law) are
owned by such Person or any Wholly Owned Subsidiary of such Person.

SECTION 1.02.  Incorporation by Reference of TIA.
               ---------------------------------

          Whenever this Indenture refers to a provision of the TIA, such
provision is incorporated by reference in, and made a part of, this Indenture.
The following TIA terms used in this Indenture have the following meanings:

          "indenture securities" means the Securities.
           --------------------

                                     -37-
<PAGE>

          "indenture security holder" means a Holder or a Securityholder.
           -------------------------

          "indenture to be qualified" means this Indenture.
           -------------------------

          "indenture trustee" or "institutional trustee" means the Trustee.
           -----------------      ---------------------

          "obligor" on the indenture securities means the Company, any Guarantor
           -------
or any other obligor on the Securities.

          All other TIA terms used in this Indenture that are defined by the
TIA, defined by TIA reference to another statute or defined by Commission rule
and not otherwise defined herein have the meanings assigned to them therein.

SECTION 1.03.  Rules of Construction.
               ---------------------

          Unless the context otherwise requires:

             (1)  a term has the meaning assigned to it;

             (2)  an accounting term not otherwise defined has the meaning
     assigned to it in accordance with GAAP;

             (3)  "or" is not exclusive;

             (4)  words in the singular include the plural, and words in the
     plural include the singular;

             (5)  provisions apply to successive events and transactions; and

             (6)  "herein," "hereof" and other words of similar import refer to
     this Indenture as a whole and not to any particular Article, Section or
     other subdivision.

                                     -38-
<PAGE>

                                  ARTICLE TWO

                                 THE SECURITIES

SECTION 2.01.  Form and Dating.
               ---------------

          The Securities and the Trustee's certificate of authentication shall
be substantially in the form of Exhibit A hereto.  The Securities may have
                                ---------
notations, legends or endorsements required by law, stock exchange rule or
usage.  The Company shall approve the form of the Securities and any notation,
legend or endorsement on them.  Each Security shall be dated the date of its
issuance and show the date of its authentication.  Each Security shall have an
executed Guarantee from each of the Guarantors endorsed thereon substantially in
the form of Exhibit E.
            ---------

          The terms and provisions contained in the Securities and the
Guarantees shall constitute, and are hereby expressly made, a part of this
Indenture and, to the extent applicable, the Company, the Guarantors and the
Trustee, by their execution and delivery of this Indenture, expressly agree to
such terms and provisions and to be bound thereby.

          Securities offered and sold in reliance on Rule 144 and Securities
offered and sold in reliance on Regulation S shall be issued initially in the
form of one or more Global Securities, substantially in the form set forth in
Exhibit A, deposited with the Trustee, as custodian for the Depository, duly
---------
executed by the Company (and having an executed Guarantee from each of the
Guarantors endorsed thereon) and authenticated by the Trustee as hereinafter
provided and shall bear the legends set forth in Exhibit B.  The aggregate
                                                 ---------
principal amount of the Global Securities may from time to time be increased or
decreased by adjustments made on the records of the Trustee, as custodian for
the Depository, as hereinafter provided.

          Securities issued in exchange for interests in a Global Security
pursuant to Section 2.16 may be issued in the form of permanent certificated
Securities in registered form in

                                     -39-
<PAGE>

substantially the form set forth in Exhibit A (the "Physical Securities").
                                    ---------       -------------------

SECTION 2.02.  Execution and Authentication.
               ----------------------------

          Two Officers, or an Officer and an Assistant Secretary, shall sign, or
one Officer shall sign and one Officer or an Assistant Secretary (each of whom
shall, in each case, have been duly authorized by all requisite corporate
actions) shall attest to, the Securities for the Company by manual or facsimile
signature.

          If an Officer whose signature is on a Security or Guarantee, as the
case may be, was an Officer at the time of such execution but no longer holds
that office at the time the Trustee authenticates the Security, the Security
shall nevertheless be valid.

          A Security shall not be valid until an authorized signatory of the
Trustee manually signs the certificate of authentication on the Security.  The
signature shall be conclusive evidence that the Security has been authenticated
under this Indenture.

          The Trustee shall authenticate Securities for original issue on the
Issue Date in the aggregate principal amount of $200,000,000 upon a written
order of the Company in the form of an Officers' Certificate.  In addition, the
Trustee shall authenticate Securities for original issue after the Issue Date in
the aggregate principal amount of up to $200,000,000 upon a written order of the
Company in the form of an Officers' Certificate.  Each such Officers'
Certificate shall specify the amount of Securities to be authenticated and the
date on which the Securities are to be authenticated.  The aggregate principal
amount of Securities outstanding at any time may not exceed $400,000,000, except
as provided in Section 2.07.

          The Trustee may appoint an authenticating agent reasonably acceptable
to the Company to authenticate Securities.  Unless otherwise provided in the
appointment, an authenticating agent may authenticate Securities whenever the
Trustee may do so.  Each reference in this Indenture to authentication by the

                                     -40-
<PAGE>

Trustee includes authentication by such agent.  An authenticating agent has the
same rights as an Agent to deal with the Company and Affiliates of the Company.

          The Securities shall be issuable only in registered form without
coupons in denominations of $1,000 and integral multiples thereof.

SECTION 2.03.  Registrar and Paying Agent.
               --------------------------

          The Company shall maintain an office or agency in the Borough of
Manhattan, The City of New York, where (a) Securities may be presented or
surrendered for registration of transfer or for exchange ("Registrar"), (b)
                                                           ---------
Securities may be presented or surrendered for payment ("Paying Agent") and (c)
                                                         ------------
notices and demands to or upon the Company in respect of the Securities and this
Indenture may be served.  The Company may also from time to time designate one
or more other offices or agencies where the Securities may be presented or
surrendered for any or all such purposes and may from time to time rescind such
designations; provided, however, that no such designation or rescission shall in
              --------  -------
any manner relieve the Company of its obligation to maintain an office or agency
in the Borough of Manhattan, The City of New York, for such purposes.  The
Company may act as its own Registrar, Paying Agent or Calculation Agent except
that for the purposes of Articles Three and Eight and Sections 4.15 and 4.16,
neither the Company nor any Affiliate of the Company shall act as Paying Agent.
The Registrar shall keep a register of the Securities and of their transfer and
exchange.  The Company, upon notice to the Trustee, may have one or more co-
Registrars and one or more additional paying agents reasonably acceptable to
the Trustee.  The term "Paying Agent" includes any additional paying agent.  The
Company initially appoints the Trustee as Registrar and Paying Agent until such
time as the Trustee has resigned or a successor has been appointed.

          The Company shall enter into an appropriate agency agreement with any
Agent not a party to this Indenture, which agreement shall implement the
provisions of this Indenture that relate to such Agent.  The Company shall
notify the Trustee, in advance, of the name and address of any such Agent.  If
the

                                     -41-
<PAGE>

Company fails to maintain a Registrar or Paying Agent, the Trustee shall act
as such.

SECTION 2.04.  Paying Agent To Hold Assets in Trust.
               ------------------------------------

          The Company shall require each Paying Agent other than the Trustee to
agree in writing that, subject to Article Four and Article Twelve, each Paying
Agent shall hold in trust for the benefit of Holders or the Trustee all assets
held by the Paying Agent for the payment of principal of, or interest on, the
Securities (whether such assets have been distributed to it by the Company or
any other obligor on the Securities), and shall notify the Trustee of any
Default by the Company (or any other obligor on the Securities) in making any
such payment.  If the Company or a Subsidiary acts as Paying Agent, it shall
segregate such assets and hold them as a separate trust fund.  The Company at
any time may require a Paying Agent to distribute all assets held by it to the
Trustee and account for any assets disbursed and the Trustee may at any time
during the continuance of any payment Default, upon written request to a Paying
Agent, require such Paying Agent to distribute all assets held by it to the
Trustee and to account for any assets distributed.  Upon distribution to the
Trustee of all assets that shall have been delivered by the Company to the
Paying Agent, the Paying Agent shall have no further liability for such assets.

SECTION 2.05.  Holder Lists.
               ------------

          The Trustee shall preserve in as current a form as is reasonably
practicable the most recent list available to it of the names and addresses of
Holders.  If the Trustee is not the Registrar, the Company shall furnish to the
Trustee on or before each Interest Payment Date and at such other times as the
Trustee may request in writing a list in such form and as of such date as the
Trustee may reasonably require of the names  and addresses of Holders, which
list may be conclusively relied upon by the Trustee.

                                     -42-
<PAGE>

SECTION 2.06.  Transfer and Exchange.
               ---------------------

          Subject to Sections 2.15 and 2.16, when Securities are presented to
the Registrar or a co-Registrar with a request to register the transfer of such
Securities or to exchange such Securities for an equal principal amount of
Securities of other authorized denominations, the Registrar or co-Registrar
shall register the transfer or make the exchange as requested if its
requirements for such transaction are met; provided, however, that the
                                           --------  -------
Securities surrendered for transfer or exchange shall be duly endorsed or
accompanied by a written instrument of transfer in form satisfactory to the
Company and the Registrar or co-Registrar, duly executed by the Holder thereof
or his attorney duly authorized in writing.  To permit registrations of
transfers and exchanges, the Company shall execute and the Trustee shall
authenticate Securities at the Registrar's or co-Registrar's request.  No
service charge shall be made for any registration of transfer or exchange, but
the Company may require payment of a sum sufficient to cover any transfer tax or
similar governmental charge payable in connection therewith.  The Registrar or
co-Registrar shall not be required to register the transfer of or exchange of
any Security (i) during a period beginning at the opening of business 15 days
before the mailing of a notice of redemption of Securities and ending at the
close of business on the day of such mailing, (ii) selected for redemption in
whole or in part pursuant to Article Three, except the unredeemed portion of any
Security being redeemed in part, and (iii) during a Change of Control Offer or
an Net Proceeds Offer if such Security is tendered pursuant to such Change of
Control Offer or Net Proceeds Offer and not withdrawn.

          Any Holder of a beneficial interest in a Global Security shall, by
acceptance of such beneficial interest, agree that transfers of beneficial
interests in such Global Securities may be effected only through a book entry
system maintained by the Holder of such Global Security (or its agent), and that
ownership of a beneficial interest in the Security shall be required to be
reflected in a book entry system.

                                     -43-
<PAGE>

SECTION 2.07.  Replacement Securities.
               ----------------------

          If a mutilated Security is surrendered to the Trustee or if the Holder
of a Security claims that the Security has been lost, destroyed or wrongfully
taken, the Company shall issue and the Trustee shall authenticate a replacement
Security if the Trustee's requirements are met.  If required by the Trustee or
the Company, such Holder must provide an indemnity bond or other indemnity,
sufficient in the judgment of both the Company and the Trustee, to protect the
Company, the Trustee or any Agent from any loss which any of them may suffer if
a Security is replaced.  The Company may charge such Holder for its reasonable
out-of-pocket expenses in replacing a Security pursuant to this Section 2.07,
including reasonable fees and expenses of counsel.

          Every replacement Security is an additional obligation of the Company
and every replacement Guarantee shall constitute an additional obligation of the
Guarantors.

SECTION 2.08.  Outstanding Securities.
               ----------------------

          Securities outstanding at any time are all the Securities that have
been authenticated by the Trustee except those cancelled by it, those delivered
to it for cancellation and those described in this Section as not outstanding.
A Security does not cease to be outstanding because the Company, the Guarantors
or any of their respective Affiliates holds the Security (subject to the
provisions of Section 2.09).

          If a Security is replaced pursuant to Section 2.07 (other than a
mutilated Security surrendered for replacement), it ceases to be outstanding
unless the Trustee receives proof satisfactory to it that the replaced Security
is held by a protected purchaser.  A mutilated Security ceases to be outstanding
upon surrender of such Security and replacement thereof pursuant to Section
2.07.  If the principal amount of any Security is considered paid under Section
4.01, it ceases to be outstanding and interest ceases to accrue.

          If on a Redemption Date or the Maturity Date the Paying Agent (other
than the Company or a Subsidiary) holds U.S.

                                     -44-
<PAGE>

Legal Tender or U.S. Government Obligations sufficient to pay all of the
principal and interest due on the Securities payable on that date, then on and
after that date such Securities cease to be outstanding and interest on them
ceases to accrue.

SECTION 2.09.  Treasury Securities.
               -------------------

          In determining whether the Holders of the required principal amount of
Securities have concurred in any direction, waiver or consent, Securities owned
by the Company, any of its Subsidiaries or any of their respective Affiliates
shall be disregarded, except that, for the purposes of determining whether the
Trustee shall be protected in relying on any such direction, waiver or consent,
only Securities that the Trustee knows or has reason to know are so owned shall
be disregarded.

SECTION 2.10.  Temporary Securities.
               --------------------

          Until definitive Securities are ready for delivery, the Company may
prepare and the Trustee shall authenticate temporary Securities.  Temporary
Securities shall be substantially in the form of definitive Securities but may
have variations that the Company considers appropriate for temporary Securities.
Without unreasonable delay, the Company shall prepare and the Trustee shall
authenticate definitive Securities in exchange for temporary Securities.  Until
such exchange, temporary Securities shall be entitled to the same rights,
benefits and privileges as definitive Securities.  Notwithstanding the
foregoing, so long as the Securities are represented by a Global Security, such
Global Security may be in typewritten form.

SECTION 2.11.  Cancellation.
               ------------

          The Company at any time may deliver Securities to the Trustee for
cancellation.  The Registrar and the Paying Agent shall forward to the Trustee
any Securities surrendered to them for transfer, exchange or payment.  The
Trustee, or at the direction of the Trustee, the Registrar or the Paying Agent
(other than the Company or a Subsidiary), and no one else, shall cancel and, at
the written direction of the Company, shall dispose of all Securities
surrendered for transfer, ex-

                                     -45-
<PAGE>

change, payment or cancellation. Subject to Section 2.07, the Company may not
issue new Securities to replace Securities that it has paid or delivered to the
Trustee for cancellation. If the Company or any Guarantor shall acquire any of
the Securities, such acquisition shall not operate as a redemption or
satisfaction of the Indebtedness represented by such Securities unless and until
the same are surrendered to the Trustee for cancellation pursuant to this
Section 2.11.

SECTION 2.12.  Defaulted Interest.
               ------------------

          If the Company defaults in a payment of interest on the Securities, it
shall, unless the Trustee fixes another record date pursuant to Section 6.10,
pay the defaulted interest, plus (to the extent lawful) any interest payable on
the defaulted interest, in any lawful manner.  The Company may pay the defaulted
interest to the persons who are Holders on a subsequent special record date,
which date shall be the fifteenth day next preceding the date fixed by the
Company for the payment of defaulted interest or the next succeeding Business
Day if such date is not a Business Day.  At least 15 days before any such
subsequent special record date, the Company shall mail to each Holder, with a
copy to the Trustee, a notice that states the subsequent special record date,
the payment date and the amount of defaulted interest, and interest payable on
such defaulted interest, if any, to be paid.

SECTION 2.13.  CUSIP Number.
               ------------

          The Company in issuing the Securities may use a "CUSIP" number, and if
so, the Trustee shall use the CUSIP number in notices of redemption or exchange
as a convenience to Holders; provided, however, that any such notice may state
                             --------  -------
that no representation is made as to the correctness or accuracy of the CUSIP
number printed in the notice or on the Securities, and that reliance may be
placed only on the other identification numbers printed on the Securities.

SECTION 2.14.  Deposit of Moneys.
               -----------------

          Prior to 11:00 a.m. New York City time on each Interest Payment Date,
Maturity Date, Redemption Date, Change of

                                     -46-
<PAGE>

Control Payment Date and Net Proceeds Offer Payment Date, the Company shall have
deposited with the Paying Agent in immediately available funds money sufficient
to make cash payments, if any, due on such Interest Payment Date, Maturity Date,
Redemption Date, Change of Control Payment Date and Net Proceeds Offer Payment
Date, as the case may be, in a timely manner which permits the Paying Agent to
remit payment to the Holders on such Interest Payment Date, Maturity Date,
Redemption Date, Change of Control Payment Date and Net Proceeds Offer Payment
Date, as the case may be.

SECTION 2.15.  Book-Entry Provisions for Global Securities.
               -------------------------------------------

          (a) The Global Securities initially shall (i) be registered in the
name of the Depository or the nominee of such Depository, (ii) be delivered to
the Trustee as custodian for such Depository and (iii) bear legends as set forth
in Exhibit B.
   ---------

          Members of, or participants in, the Depository ("Participants") shall
                                                           ------------
have no rights under this Indenture with respect to any Global Security held on
their behalf by the Depository, or the Trustee as its custodian, or under the
Global Security, and the Depository may be treated by the Company, the Trustee
and any agent of the Company or the Trustee as the absolute owner of the Global
Security for all purposes whatsoever.  Notwithstanding the foregoing, nothing
herein shall prevent the Company, the Trustee or any agent of the Company or the
Trustee from giving effect to any written certification, proxy or other
authorization furnished by the Depository or impair, as between the Depository
and Participants, the operation of customary practices governing the exercise of
the rights of a Holder of any Security.

          (b) Transfers of Global Securities shall be limited to transfers in
whole, but not in part, to the Depository, its successors or their respective
nominees.  Interests of beneficial owners in the Global Securities may be
transferred or exchanged for Physical Securities in accordance with the rules
and procedures of the Depository and the provisions of Section 2.16.  In
addition, Physical Securities shall be transferred to all beneficial owners in
exchange for their beneficial inter-

                                     -47-
<PAGE>

ests in Global Securities if (i) the Depository notifies the Company that it is
unwilling or unable to continue as Depository for any Global Security and a
successor Depository is not appointed by the Company within 90 days of such
notice or (ii) an Event of Default has occurred and is continuing and the
Registrar has received a written request from the Depository to issue Physical
Securities.

          (c) In connection with any transfer or exchange of a portion of the
beneficial interest in a Global Security to beneficial owners pursuant to
paragraph (b), the Registrar shall (if one or more Physical Securities are to be
issued) reflect on its books and records the date and a decrease in the
principal amount of such Global Security in an amount equal to the principal
amount of the beneficial interest in the Global Security to be transferred, and
the Company shall execute, and the Trustee shall authenticate and deliver, one
or more Physical Securities of authorized denominations in an aggregate
principal amount equal to the principal amount of the beneficial interest in the
Global Security so transferred.

          (d) In connection with the transfer of a Global Security as an
entirety to beneficial owners pursuant to paragraph (b) of this Section 2.15,
such Global Security shall be deemed to be surrendered to the Trustee for
cancellation, and the Company shall execute, the Guarantors shall execute
Guarantees on and the Trustee shall upon written instructions from the Company
authenticate and deliver, to each beneficial owner identified by the Depository
in exchange for its beneficial interest in such Global Security, an equal
aggregate principal amount of Physical Securities of authorized denominations.

          (e) Any Physical Security constituting a Restricted Security delivered
in exchange for an interest in a Global Security pursuant to paragraph (b) or
(c) of this Section 2.15 shall, except as otherwise provided by Section 2.16,
bear the Private Placement Legend.

          (f) The Holder of any Global Security may grant proxies and otherwise
authorize any Person, including Participants and Persons that may hold interests
through Participants,

                                     -48-
<PAGE>

to take any action which a Holder is entitled to take under this Indenture or
the Securities.

SECTION 2.16.  Special Transfer Provisions.
               ---------------------------

          (a)  Transfers to Non-QIB Institutional Accredited Investors and Non-
               ---------------------------------------------------------------
U.S. Persons.  The following additional provisions shall apply with respect to
------------
the registration of any proposed transfer of a Restricted Security to any
Institutional Accredited Investor which is not a QIB or to any Non-U.S. Person:

            (i) the Registrar shall register the transfer of any Restricted
     Security, whether or not such Security bears the Private Placement Legend,
     if (x) the requested transfer is after the second anniversary of the Issue
     Date; provided, however, that neither the Company nor any Affiliate of the
           --------  -------
     Company has held any beneficial interest in such Security, or portion
     thereof, at any time on or prior to the second anniversary of the Issue
     Date or (y) (1) in the case of a transfer to an Institutional Accredited
     Investor which is not a QIB (excluding Non-U.S. Persons), the proposed
     transferee has delivered to the Registrar a certificate substantially in
     the form of Exhibit C hereto and any legal opinions and certifications
                 ---------
     required thereby and (2) in the case of a transfer to a Non-U.S. Person,
     the proposed transferor has delivered to the Registrar a certificate
     substantially in the form of Exhibit D hereto;
                                  ---------

            (ii) if the proposed transferee is a Participant and the Securities
     to be transferred consist of Physical Securities which after transfer are
     to be evidenced by an interest in the IAI Global Security or Regulation S
     Global Security, as the case may be, upon receipt by the Registrar of (x)
     written instructions given in accordance with the Depository's and the
     Registrar's procedures and (y) the appropriate certificate, if any,
     required by clause (y) of paragraph (i) above, the Registrar shall register
     the transfer and reflect on its books and records the date and an increase
     in the principal amount of the IAI Global Security or Regulation S Global
     Security, as the case may be, in an amount equal to the principal amount of
     Physical

                                     -49-
<PAGE>

     Securities to be transferred, and the Registrar shall cancel the Physical
     Securities so transferred; and

            (iii)  if the proposed transferor is a Participant seeking to
     transfer an interest in a Global Security, upon receipt by the Registrar of
     (x) written instructions given in accordance with the Depository's and the
     Registrar's procedures and (y) the appropriate certificate, if any,
     required by clause (y) of paragraph (i) above, the Registrar shall register
     the transfer and reflect on its books and records the date and (A) a
     decrease in the principal amount of the Global Security from which such
     interests are to be transferred in an amount equal to the principal amount
     of the Securities to be transferred and (B) an increase in the principal
     amount of the IAI Global Security or the Regulation S Global Security, as
     the case may be, in an amount equal to the principal amount of the
     Securities to be transferred.

          (b)   Transfers to QIBs.  The following provisions shall apply with
                -----------------
respect to the registration of any proposed transfer of a Restricted Security to
a QIB:

            (i) the Registrar shall register the transfer of any Restricted
     Security, whether or not such Security bears the Private Placement Legend,
     if (x) the requested transfer is after the second anniversary of the Issue
     Date; provided, however, that neither the Company nor any Affiliate of the
           --------  -------
     Company has held any beneficial interest in such Security, or portion
     thereof, at any time on or prior to the second anniversary of the Issue
     Date or (y) such transfer is being made by a proposed transferor who has
     checked the box provided for on the form of Security stating, or has
     otherwise advised the Company and the Registrar in writing, that the sale
     has been made in compliance with the provisions of Rule 144A to a
     transferee who has signed the certification provided for on the form of
     Security stating, or has otherwise advised the Company and the Registrar in
     writing, that it is purchasing the Security for its own account or an
     account with respect to which it exercises sole investment discretion and
     that it and any such account is a QIB within the meaning of Rule 144A, and

                                     -50-
<PAGE>

     is aware that the sale to it is being made in reliance on Rule 144A and
     acknowledges that it has received such information regarding the Company as
     it has requested pursuant to Rule 144A or has determined not to request
     such information and that it is aware that the transferor is relying upon
     its foregoing representations in order to claim the exemption from
     registration provided by Rule 144A;

            (ii)   if the proposed transferee is a Participant and the
     Securities to be transferred consist of Physical Securities which after
     transfer are to be evidenced by an interest in the 144A Global Security,
     upon receipt by the Registrar of written instructions given in accordance
     with the Depository's and the Registrar's procedures, the Registrar shall
     register the transfer and reflect on its book and records the date and an
     increase in the principal amount of the 144A Global Security in an amount
     equal to the principal amount of Physical Securities to be transferred, and
     the Registrar shall cancel the Physical Securities so transferred; and

            (iii)  if the proposed transferor is a Participant seeking to
     transfer an interest in the IAI Global Security or the Regulation S Global
     Security, upon receipt by the Registrar of written instructions given in
     accordance with the Depository's and the Registrar's procedures, the
     Registrar shall register the transfer and reflect on its books and records
     the date and (A) a decrease in the principal amount of the IAI Global
     Security or the Regulation S Global Security, as the case may be, in an
     amount equal to the principal amount of the Securities to be transferred
     and (B) an increase in the principal amount of the 144A Global Security in
     an amount equal to the principal amount of the Securities to be
     transferred.

          (c)  Restrictions on Transfer and Exchange of Global Securities.
               ----------------------------------------------------------
Notwithstanding any other provisions of this Indenture, a Global Security may
not be transferred as a whole except by the Depository to a nominee of the
Depository or by a nominee of the Depository to the Depository or another
nominee of the Depository or by the Depository or any such nominee to a
successor Depository or a nominee of such successor Depository.

                                     -51-
<PAGE>

          (d)  Private Placement Legend.  Upon the transfer, exchange or
               ------------------------
replacement of Securities not bearing the Private Placement Legend, the
Registrar or co-Registrar shall deliver Securities that do not bear the Private
Placement Legend.  Upon the transfer, exchange or replacement of Securities
bearing the Private Placement Legend, the Registrar or co-Registrar shall
deliver only Securities that bear the Private Placement Legend unless (i) there
is delivered to the Trustee an Opinion of Counsel reasonably satisfactory to the
Company and the Trustee to the effect that neither such legend nor the related
restrictions on transfer are required in order to maintain compliance with the
provisions of the Securities Act or (ii) such Security has been sold pursuant to
an effective registration statement under the Securities Act.

          (e)  General.  By its acceptance of any Security bearing the Private
               -------
Placement Legend, each Holder of such a Security acknowledges the restrictions
on transfer of such Security set forth in this Indenture and in the Private
Placement Legend and agrees that it will transfer such Security only as provided
in this Indenture.

          The Registrar shall retain copies of all letters, notices and other
written communications received pursuant to Section 2.15 or this Section 2.16.
The Company shall have the right to inspect and make copies of all such letters,
notices or other written communications at any reasonable time upon the giving
of reasonable written notice to the Registrar.

                                 ARTICLE THREE

                                   REDEMPTION

SECTION 3.01.  Notices to Trustee.
               ------------------

          If the Company elects to redeem Securities pursuant to Paragraph 6 or
Paragraph 7 of the Securities, it shall notify the Trustee in writing of the
Redemption Date, the Redemption Price and the principal amount of Securities to
be redeemed.  The Company shall give notice of redemption to the Paying Agent
and Trustee at least 45 days but not more than 60

                                     -52-
<PAGE>

days before the Redemption Date (unless a shorter notice shall be agreed to by
the Trustee in writing), together with an Officers' Certificate stating that
such redemption will comply with the conditions contained herein.

SECTION 3.02.  Selection of Securities To Be Redeemed.
               --------------------------------------

          In the event that less than all of the Securities are to be redeemed
at any time, selection of such Securities for redemption will be made by the
Trustee in compliance with the requirements of the principal national securities
exchange, if any, on which such Securities are listed or, if such Securities are
not then listed on a national securities exchange, on a pro rata basis, by lot
                                                        --- ----
or by such method as the Trustee shall deem fair and appropriate; provided,
                                                                  --------
however, that no Securities of a principal amount of $1,000 or less shall be
-------
redeemed in part; and provided, further, that if a partial redemption is made
                      --------  -------
with the net cash proceeds of an Equity Offering, selection of the Securities or
portions thereof for redemption shall be made by the Trustee only on a pro rata
                                                                       --- ----
basis or on as nearly a pro rata basis as is practicable (subject to the
                        --- ----
procedures of the Depository), unless such method is otherwise prohibited.

SECTION 3.03.  Notice of Redemption.
               --------------------

          At least 30 days but not more than 60 days before a Redemption Date,
the Company shall mail a notice of redemption by first class mail, postage
prepaid, to each Holder whose Securities are to be redeemed at its registered
address.  At the Company's request, the Trustee shall give the notice of
redemption in the Company's name and at the Company's expense.  Each notice for
redemption shall identify the Securities to be redeemed and shall state:

             (1)  the Redemption Date;

             (2)  the Redemption Price and the amount of accrued interest, if
     any, to be paid;

             (3)  the name and address of the Paying Agent;

                                     -53-
<PAGE>

             (4)  that Securities called for redemption must be surrendered to
     the Paying Agent to collect the Redemption Price plus accrued interest, if
     any;

             (5)  that, unless the Company defaults in making the redemption
     payment, interest on Securities called for redemption ceases to accrue on
     and after the Redemption Date, and the only remaining right of the Holders
     of such Securities is to receive payment of the Redemption Price upon
     surrender to the Paying Agent of the Securities redeemed;

             (6)  if any Security is being redeemed in part, the portion of the
     principal amount of such Security to be redeemed and that, after the
     Redemption Date, and upon surrender of such Security, a new Security or
     Securities in aggregate principal amount equal to the unredeemed portion
     thereof will be issued;

             (7)  if fewer than all the Securities are to be redeemed, the
     identification of the particular Securities (or portion thereof) to be
     redeemed, as well as the aggregate principal amount of Securities to be
     redeemed and the aggregate principal amount of Securities to be outstanding
     after such partial redemption; and

             (8)  the Paragraph of the Securities pursuant to which the
     Securities are to be redeemed.

          The notice, if mailed in a manner herein provided, shall be
conclusively presumed to have been given, whether or not the Holder receives
such notice.  In any case, failure to give such notice by mail or any defect in
the notice to the Holder of any Security designated for redemption in whole or
in part shall not affect the validity of the proceedings for the redemption of
any other Security.

SECTION 3.04.  Effect of Notice of Redemption.
               ------------------------------

          Once notice of redemption is mailed in accordance with Section 3.03,
Securities called for redemption become due and payable on the Redemption Date
and at the Redemption Price  plus accrued interest, if any.  Upon surrender to
the Trustee

                                     -54-
<PAGE>

or Paying Agent, such Securities called for redemption shall be paid at the
Redemption Price (which shall include accrued interest thereon to the Redemption
Date), but installments of interest, the maturity of which is on or prior to the
Redemption Date, shall be payable to Holders of record at the close of business
on the relevant Record Dates.

SECTION 3.05.  Deposit of Redemption Price.
               ---------------------------

          On or before 11:00 a.m. New York time on the Redemption Date, the
Company shall deposit with the Paying Agent U.S. Legal Tender sufficient to pay
the Redemption Price plus accrued interest, if any, of all Securities to be
redeemed on that date.

          If the Company complies with the preceding paragraph, then, unless the
Company defaults in the payment of such Redemption Price plus accrued interest,
if any, interest on the Securities to be redeemed will cease to accrue on and
after the applicable Redemption Date, whether or not such Securities are
presented for payment.

SECTION 3.06.  Securities Redeemed in Part.
               ---------------------------

          Upon surrender of a Security that is to be redeemed in part only, the
Trustee shall upon written instruction from the Company authenticate for the
Holder a new Security or Securities in a principal amount equal to the
unredeemed portion of the Security surrendered.

                                  ARTICLE FOUR

                                   COVENANTS

SECTION 4.01.  Payment of Securities.
               ---------------------

          The Company shall pay the principal of and interest on the Securities
in the manner provided in the Securities.  An installment of principal of or
interest on the Securities shall be considered paid on the date it is due if the
Trustee or Paying Agent holds on that date U.S. Legal Tender designated for

                                     -55-
<PAGE>

and sufficient to pay the installment. Interest on the Securities will be
computed on the basis of a 360-day year comprised of twelve 30-day months.

SECTION 4.02.  Maintenance of Office or Agency.
               -------------------------------

          The Company shall maintain in the Borough of Manhattan, The City of
New York, the office or agency required under Section 2.03.  The Company shall
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 Company 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 address of the Trustee set forth in Section 13.02.

          The Company may also from time to time designate one or more other
offices or agencies where the Securities may be presented or surrendered for any
or all such purposes and may from time to time rescind such designations.  The
Company will give prompt written notice to the Trustee of any such designation
or rescission and of any change in the location of any such other office or
agency.

          The Company hereby initially designates the Corporate Trust Office of
the Trustee located in the Borough of Manhattan, The City of New York, as such
office of the Company in accordance with Section 2.03.

SECTION 4.03.  Limitation on Restricted Payments.
               ---------------------------------

          The Company shall not, and shall not cause or permit any of its
Restricted Subsidiaries to, directly or indirectly, (a) declare or pay any
dividend or make any distribution (other than dividends or distributions payable
in Qualified Capital Stock of the Company) on or in respect of shares of the
Company's Capital Stock to holders of such Capital Stock, (b) purchase, redeem
or otherwise acquire or retire for value any Capital Stock of the Company or any
warrants, rights or options to purchase or acquire shares of any class of such
Capital Stock, (c) make (i) any principal payment on, purchase, defease, redeem,
prepay, decrease or otherwise acquire or retire

                                     -56-
<PAGE>

for value, prior to any scheduled final maturity, scheduled repayment or
scheduled sinking fund payment, any Indebtedness of the Company that is
subordinate or junior in right of payment to the Securities, including, without
limitation, the Convertible Subordinated Notes (except a conversion thereof into
Qualified Capital Stock) and (ii) any cash interest payments on the Convertible
Subordinated Notes or (d) make any Investment (other than Permitted Investments)
(each of the foregoing actions set forth in clauses (a), (b), (c) and (d) being
referred to as a Restricted Payment"), if immediately after giving effect to the
                 ------------------
Restricted Payment, (i) a Default or an Event of Default shall have occurred and
be continuing or (ii) the Company is not able to incur at least $1.00 of
additional Indebtedness (other than Permitted Indebtedness) in compliance with
Section 4.04 or (iii) the aggregate amount of Restricted Payments (including
such proposed Restricted Payment) made subsequent to the Issue Date (the amount
expended for such purposes, if other than in cash, being the fair market value
of such property as determined reasonably and in good faith by senior management
or, in the case of any such property in excess of $5 million, by the Board of
Directors of the Company) shall exceed the sum of: (w) 50% of the cumulative
Consolidated Net Income (or if cumulative Consolidated Net Income shall be a
loss, minus 100% of such loss) of the Company earned subsequent to the Issue
Date and on or prior to the date the Restricted Payment occurs (the "Reference
                                                                     ---------
Date") (treating such period as a single accounting period); plus (x) 100% of
----
(1) the aggregate net cash proceeds received by the Company from any Person
(other than a Subsidiary of the Company) from the issuance and sale subsequent
to the Issue Date and on or prior to the Reference Date of Qualified Capital
Stock of the Company and (2) the fair market value (as determined in good faith
by senior management or, in the case of a fair market value in excess of $5
million, by the Board of Directors of the Company) of shares of Qualified
Capital Stock of the Company issued subsequent to the Issue Date and on or prior
to the Reference Date in connection with Asset Acquisitions and other
acquisitions of property after the Issue Date; plus (y) without duplication of
any amounts included in clause (iii)(x) above, 100% of (1) the aggregate net
cash proceeds and (2) the fair market value of property other than cash (as
determined in good faith by senior management or, in the case of a fair market
value in excess of $5 million, by

                                     -57-
<PAGE>

the Board of Directors of the Company), in each case of any equity contribution
received by the Company from a holder of the Company's Capital Stock subsequent
to the Issue Date and on or prior to the Reference Date; plus (z) without
duplication, the sum of (1) the aggregate amount returned in cash on or with
respect to Investments (other than Permitted Investments) made subsequent to the
Issue Date whether through interest payments, principal payments, dividends or
other distributions or payments, (2) the net cash proceeds received by the
Company or any of its Restricted Subsidiaries from the disposition of all or any
portion of such Investments (other than to a Subsidiary of the Company) and (3)
upon redesignation of an Unrestricted Subsidiary as a Restricted Subsidiary, the
fair market value of such Subsidiary; provided, however, that the sum of clauses
                                      --------  -------
(1), (2) and (3) above shall not exceed the aggregate amount of all such
Investments made subsequent to the Issue Date.

          Notwithstanding the foregoing, the provisions set forth in the
immediately preceding paragraph do not prohibit:  (1) the payment of any
dividend within 60 days after the date of declaration of such dividend if the
dividend would have been permitted on the date of declaration; (2) if no Default
or Event of Default shall have occurred and be continuing, the acquisition of
any shares of Capital Stock of the Company, either (i) solely in exchange for
shares of Qualified Capital Stock of the Company or (ii) through the application
of net proceeds of a substantially concurrent sale for cash (other than to a
Subsidiary of the Company) of shares of Qualified Capital Stock of the Company;
(3) if no Default or Event of Default shall have occurred and be continuing, the
acquisition of any Indebtedness of the Company that is subordinate or junior in
right of payment to the Securities either (i) solely in exchange for shares of
Qualified Capital Stock of the Company, or (ii) through the application of net
proceeds of a substantially concurrent sale for cash (other than to a Subsidiary
of the Company) of (A) shares of Qualified Capital Stock of the Company or (B)
Refinancing Indebtedness; (4) so long as no Default or Event of Default shall
have occurred and be continuing, repurchases by the Company of Common Stock of
the Company from employees of the Company or any of its Subsidiaries or their
authorized representatives upon the death, disability or termination of
employment of such employees, in an aggregate amount not to exceed $5 million in
any calendar year; (5) the consummation of the Tender Offer; (6) so long as no
Default or Event of Default shall have occurred or be continuing, the
declaration and pay-

                                     -58-
<PAGE>

ment of dividends to holders of any class or series of Preferred Stock of the
Company (other than Disqualified Capital Stock) issued after the Issue Date,
provided that after giving effect to such issuance on a pro forma basis, the
                                                        --- -----
Company would be permitted to incur at least $1.00 of additional Indebtedness
(other than Permitted Indebtedness) pursuant to Section 4.04; (7) cash payments
in lieu of payment of (i) fractional Convertible Subordinated Notes in lieu of
cash interest thereon or (ii) fractional shares of Common Stock of the Company
upon conversion of Convertible Subordinated Notes; and (8) other Restricted
Payments in an aggregate amount not to exceed $2.0 million. In determining the
aggregate amount of Restricted Payments made subsequent to the Issue Date in
accordance with clause (4)(iii) of the immediately preceding paragraph, amounts
expended pursuant to clauses (1), (2)(ii), (4) and (6) above shall be included
in such calculation.

          Not later than the date of making any Restricted Payment, the Company
shall deliver to the Trustee an Officers' Certificate stating that such
Restricted Payment complies with this Indenture and setting forth in reasonable
detail the basis upon which the required calculations were computed, which
calculations may be based upon the Company's latest available internal quarterly
financial statements.

SECTION 4.04.  Limitation on Incurrence of Additional Indebtedness.
               ---------------------------------------------------

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, assume, guarantee,
acquire, become liable, contingently or otherwise, with respect to, or otherwise
become responsible for payment of (collectively, "incur") any Indebtedness
                                                  -----
(other than Permitted Indebtedness); provided, however, that if no Default or
                                     --------  -------
Event of Default shall have occurred and be continuing at the time of or as a
consequence of the incurrence of any such Indebtedness, the Company or any of
its Restricted Subsidiaries that is or, upon such incurrence, becomes a
Guarantor may incur Indebtedness (including, without limitation, Acquired
Indebtedness) and any Restricted Subsidiary of the Company that is not and will
not, upon such incurrence, become a Guarantor may incur Acquired Indebtedness,
in each case if on the date of the incurrence of such Indebtedness, after giving
effect to the incurrence thereof, the Consolidated Fixed Charge Coverage Ratio
of the Company is greater than 2.25 to 1.0 if such incur-

                                     -59-
<PAGE>

rence is on or prior to November 1, 2000 and 2.5 to 1.0 if such incurrence is
thereafter.

SECTION 4.05.  Corporate Existence.
               -------------------

          Except as otherwise permitted by Article Five, the Company shall do or
cause to be done all things necessary to preserve and keep in full force and
effect its corporate existence and the corporate, partnership or other existence
of each of its Restricted Subsidiaries in accordance with the respective
organizational documents of each such Restricted Subsidiary and the rights
(charter and statutory) and material franchises of the Company and each of its
Restricted Subsidiaries; provided, however, that the Company shall not be
                         --------  -------
required to preserve any such right, franchise or corporate existence with
respect to each such Restricted Subsidiary if the Board of Directors of the
Company shall determine that the loss thereof is not, and will not be, adverse
in any material respect to the Holders.

SECTION 4.06.  Payment of Taxes and Other Claims.
               ---------------------------------

          The Company shall pay or discharge or cause to be paid or discharged,
before the same shall become delinquent, (a) all material taxes, assessments and
governmental charges levied or imposed upon it or any of its Subsidiaries or
upon the income, profits or property of it or any of its Restricted Subsidiaries
and (b) all lawful claims for labor, materials and supplies which, in each case,
if unpaid, might by law become a material liability or Lien upon the property of
it or any of its Restricted Subsidiaries; provided, however, that the Company
                                          --------  -------
shall not be required to pay or discharge or cause to be paid or discharged any
such tax, assessment, charge or claim whose amount, (i) the applicability or
validity is being contested in good faith by appropriate proceedings and for
which appropriate provision has been made or (ii) where the failure to effect
such payment or discharge is not adverse in any material respect to the Holders.

SECTION 4.07.  Maintenance of Properties and Insurance.
               ---------------------------------------

          (a)  The Company shall cause all material properties owned by or
leased by it or any of its Restricted Subsidiaries

                                     -60-
<PAGE>

used or useful to the conduct of its business or the business of any of its
Restricted Subsidiaries to be maintained and kept in normal condition, repair
and working order and supplied with all necessary equipment and shall cause to
be made all repairs, renewals, replacements, and betterments thereof, all as in
its judgment may be necessary, so that the business carried on in connection
therewith may be properly and advantageously conducted at all times; provided,
                                                                     --------
however, that nothing in this Section 4.07 shall prevent the Company or any of
-------
its Restricted Subsidiaries from discontinuing the use, operation or maintenance
of any of such properties, or disposing of any of them, if such discontinuance
or disposal is, in the judgment of the Board of Directors of the Company or any
such Restricted Subsidiary desirable in the conduct of the business of the
Company or any such Restricted Subsidiary, and if such discontinuance or
disposal is not adverse in any material respect to the Holders; provided,
                                                                --------
further, that nothing in this Section 4.07 shall prevent the Company or any of
-------
its Restricted Subsidiaries from discontinuing or disposing of any properties to
the extent otherwise permitted by this Indenture.

          (b)  The Company shall maintain, and shall cause its Restricted
Subsidiaries to maintain, insurance with responsible carriers against such risks
and in such amounts, and with such deductibles, retentions, self-insured amounts
and co-insurance provisions, as are customarily carried by similar businesses of
similar size, including property and casualty loss, workers' compensation and
interruption of business insurance.

SECTION 4.08.  Compliance Certificate; Notice of Default.
               -----------------------------------------

          (a)  The Company shall deliver to the Trustee, within 120 days after
the close of each fiscal year (which on the date hereof is December 31) an
Officers' Certificate stating that a review of the activities of the Company has
been made under the supervision of the signing officers with a view to
determining whether it has kept, observed, performed and fulfilled its
obligations under this Indenture and  further stating, as to each such Officer
signing such certificate, that to the best of such Officer's knowledge, the
Company during such preceding fiscal year has kept, observed, performed and
fulfilled each and every such covenant and no Default or Event of Default
occurred dur-

                                     -61-
<PAGE>

ing such year and at the date of such certificate there is no Default or Event
of Default that has occurred and is continuing or, if such signers do know of
such Default or Event of Default, the certificate shall describe its status with
particularity. The Officers' Certificate shall also notify the Trustee should
the Company elect to change the manner in which it fixes its fiscal year end.

          (b)  The annual financial statements delivered pursuant to Section
4.10 shall be accompanied by a written report of the Company's independent
accountants (who shall be a firm of established national reputation) that in
conducting their audit of such financial statements nothing has come to their
attention that would lead them to believe that the Company has violated any
provisions of Article Four, Five or Six of this Indenture insofar as they relate
to accounting matters or, if any such violation has occurred, specifying the
nature and period of existence thereof, it being understood that such
accountants shall not be liable directly or indirectly to any Person for any
failure to obtain knowledge of any such violation.

          (c)  The Company shall deliver to the Trustee, forthwith upon becoming
aware of any Default or Event of Default in the performance of any covenant,
agreement or condition contained in this Indenture, an Officers' Certificate
specifying the Default or Event of Default and describing its status with
particularity.

SECTION 4.09.  Compliance with Laws.
               --------------------

          The Company shall comply, and shall cause each of its Subsidiaries to
comply, with all applicable statutes, rules, regulations, orders and
restrictions of the United States, all states and municipalities thereof, and of
any governmental department, commission, board, regulatory authority, bureau,
agency and instrumentality of the foregoing, in respect of the conduct of their
respective businesses and the ownership of their respective properties, except
for such noncompliances as would not in the aggregate have a material adverse
effect on the financial condition or results of operations of the Company and
its Subsidiaries taken as a whole.

                                     -62-
<PAGE>

SECTION 4.10.  Reports to Holders.
               ------------------

          Whether or not required by the rules and regulations of the
Commission, so long as any Securities are outstanding, the Company shall furnish
the Holders of Securities:

          (1) all quarterly and annual financial information that would be
     required to be contained in a filing with the Commission on Forms 10-Q and
     10-K if the Company were required to file such Forms, including a
     "Management's Discussion and Analysis of Financial Condition and Results of
     Operations" that describes the financial condition and results of
     operations of the Company and its consolidated Subsidiaries (showing in
     reasonable detail, either on the face of the financial statements or in the
     footnotes thereto, the financial condition and results of operations of the
     Company and its Restricted Subsidiaries separate from the financial
     condition and results of operations of the Unrestricted Subsidiaries of the
     Company, if any) and, with respect to the annual information only, a report
     thereon by the Company's certified independent accountants; and

          (2) all current reports that would be required to be filed with the
     Commission on Form 8-K if the Company were required to file such reports,
     in each case within two days after the time periods specified in the
     Commission's rules and regulations.

          In addition, following the consummation of the exchange offer
contemplated by the Registration Rights Agreement, whether or not required by
the rules and regulations of the Commission, the Company will file a copy of all
such information and reports with the Commission for public availability within
the time periods specified in the Commission's rules and regulations (unless the
Commission will not accept such a filing) and make such information available to
securities analysts and prospective investors upon request.  In addition, for so
long as any Securities remain outstanding, the Company shall furnish to the
Holders and to securities analysts and prospective investors, upon their
request, the information required to be delivered pursuant to Rule 144A(d)(4)
under the Securities

                                     -63-
<PAGE>

Act. The Company will also comply with the other provisions of TIA (S) 314(a).

SECTION 4.11.  Waiver of Stay, Extension or Usury Laws.
               ---------------------------------------

          Each of the Company and each Guarantor covenants (to the extent that
it may lawfully do so) that it will not at any time insist upon, plead, or in
any manner whatsoever claim or take the benefit or advantage of, any stay or
extension law or any usury law or other law that would prohibit or forgive the
Company or such Guarantor from paying all or any portion of the principal of
and/or interest on the Securities or the Guarantee of any such Guarantor as
contemplated herein, wherever enacted, now or at any time hereafter in force, or
which may affect the covenants or the performance of this Indenture, and (to the
extent that it may lawfully do so) each hereby expressly waives all benefit or
advantage of any such law, and covenants that it will not hinder, delay or
impede the execution of any power herein granted to the Trustee, but will suffer
and permit the execution of every such power as though no such law had been
enacted.

SECTION 4.12.  Limitations on Transactions with Affiliates.
               -------------------------------------------

          (a)  The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, enter into or permit to exist any
transaction or series of related transactions (including, without limitation,
the purchase, sale, lease or exchange of any property or the rendering of any
service) with, or for the benefit of, any of its Affiliates (each an "Affiliate
                                                                      ---------
Transaction"), other than (x) Affiliate Transactions permitted under paragraph
-----------
(b) below and (y) Affiliate Transactions on terms that are no less favorable
than those that might reasonably have been obtained in a comparable transaction
at such time on an arm's-length basis from a Person that is not an Affiliate of
the Company or such Restricted Subsidiary.  All Affiliate Transactions (and each
series of related Affiliate Transactions which are similar or part of a common
plan) involving aggregate payments or other property with a fair market value in
excess of $3.0 million shall be approved by the Board of Directors of the
Company or such Restricted Subsidiary, as the case may be, such approval to be

                                     -64-
<PAGE>

evidenced by a Board Resolution stating that such Board of Directors has
determined that such transaction complies with the foregoing provisions.  If the
Company or any Restricted Subsidiary of the Company enters into an Affiliate
Transaction (or a series of related Affiliate Transactions related to a common
plan) that involves an aggregate fair market value of more than $10.0 million,
the Company or such Restricted Subsidiary, as the case may be, shall, prior to
the consummation thereof, obtain a favorable opinion as to the fairness of such
transaction or series of related transactions to the Company or the relevant
Restricted Subsidiary, as the case may be, from a financial point of view, from
an Independent Financial Advisor and file the same with the Trustee.

          (b)  The restrictions set forth in clause (a) shall not apply to (i)
reasonable fees and compensation paid to and indemnity provided on behalf of,
officers, directors, employees, consultants or investment bankers of the Company
or any Restricted Subsidiary of the Company as determined in good faith by the
Company's Board of Directors or senior management; (ii) transactions exclusively
between or among the Company and any of its Wholly Owned Restricted Subsidiaries
or exclusively between or among such Wholly Owned Restricted Subsidiaries,
provided such transactions are not otherwise prohibited by this Indenture; (iii)
--------
any agreement as in effect as of the Issue Date or any amendment thereto or any
transaction contemplated thereby (including pursuant to any amendment thereto)
or any replacement agreement thereto so long as any such amendment or
replacement agreement is not more disadvantageous to the Holders in any material
respect than the original agreement as in effect on the Issue Date; (iv)
Restricted Payments permitted by this Indenture; (v) transactions in which the
Company or any of its Restricted Subsidiaries, as the case may be, delivers to
the Trustee a letter from an Independent Financial Advisor stating that such
transaction is fair to the Company or such Restricted Subsidiary from a
financial point of view or meets the requirements of the first sentence of this
Section 4.12; (vi) the existence of, or the performance by the Company or any of
its Restricted Subsidiaries of its obligations under the terms of, the
Investors' Rights Agreement, the Securities Purchase Agreement, any
stockholders' agreement (including any registration rights agreement or purchase
agreement related

                                     -65-
<PAGE>

thereto) to which it is a party as of the Issue Date and any similar agreements
which it may enter into thereafter; provided, however, that the existence of, or
                                    --------  -------
the performance by the Company or any of its Restricted Subsidiaries of
obligations under, any future amendment to any such existing agreement or under
any similar agreement entered into after the Issue Date shall only be permitted
by this clause (vi) to the extent that the terms of any such amendment or new
agreement are not otherwise disadvantageous to the Holders of the Securities in
any material respect; (vii) the issuance of securities or other payments, awards
or grants, in cash, securities or otherwise, pursuant to, or the funding of,
employment arrangements, stock options and stock ownership plans approved by the
Board of Directors of the Company in good faith and loans to employees of the
Company and its Subsidiaries which are approved by senior management of the
Company in good faith; (viii) the payment of all fees and expenses related to
the Transactions; (ix) transactions with customers, clients, suppliers,
purchasers or sellers of goods or services, in each case in the ordinary course
of business and otherwise in compliance with the terms of this Indenture, which
are fair to the Company or its Restricted Subsidiaries, in the reasonable
determination of senior management of the Company, or are on terms at least as
favorable as might reasonably have been obtained at such time from an
unaffiliated party; and (x) transactions reasonably related to (x) the exercise
of rights and remedies with respect to the Convertible Subordinated Notes or (y)
the conversion or exchange of the Convertible Subordinated Notes (each to the
extent not otherwise prohibited in this Indenture).

SECTION 4.13.  Limitation on Dividend and Other Payment Restrictions Affecting
               ---------------------------------------------------------------
               Restricted Subsidiaries.
               -----------------------

          The Company shall not, and shall not cause or permit any of its
Restricted Subsidiaries to, directly or indirectly, create or otherwise cause or
permit to exist or become effective any encumbrance or restriction on the
ability of any Restricted Subsidiary of the Company to (a) pay dividends or make
any other distributions on or in respect of its Capital Stock; (b) make loans or
advances or to pay any Indebtedness or other obligation owed to the Company or
any other Restricted Subsidi-

                                     -66-
<PAGE>

ary of the Company; or (c) transfer any of its property or assets to the Company
or any other Restricted Subsidiary of the Company, except, with respect to each
of clauses (a), (b) or (c), for such encumbrances or restrictions existing under
or by reason of: (1) applicable law; (2) this Indenture; (3) customary non-
assignment provisions of any contract or any lease governing a leasehold
interest of, or any license held by, any Restricted Subsidiary of the Company;
(4) any instrument governing Acquired Indebtedness, which encumbrance or
restriction is not applicable to any Person, or the properties or assets of any
Person, other than the Person or the properties or assets of the Person so
acquired; (5) the Credit Agreement; (6) agreements existing on the Issue Date to
the extent and in the manner such agreements are in effect on the Issue Date;
(7) an agreement governing Indebtedness incurred to Refinance the Indebtedness
issued, assumed or incurred pursuant to an agreement referred to in clauses (2),
(4), (5) or (6) above and (8) and (10) below; provided, however, that the
                                              --------  -------
provisions relating to such encumbrance or restriction contained in any such
Indebtedness are no less favorable to the Company in any material respect as
determined by the Board of Directors of the Company or senior management in its
reasonable and good faith judgment than the provisions relating to such
encumbrance or restriction contained in agreements referred to in such clause
(2), (4), (5), (6), (8) and (10); (8) purchase money obligations for property
acquired in the ordinary course of business that impose restrictions of the
nature discussed in clause (c) above on the property so acquired; (9) contracts
for the sale of assets, including without limitation, customary restrictions
with respect to a Restricted Subsidiary of the Company pursuant to an agreement
that has been entered into for the sale or disposition of the Capital Stock or
assets of such Restricted Subsidiary; (10) secured Indebtedness otherwise
permitted to be incurred pursuant to Sections 4.04 and 4.14 that limits the
right of the debtor to dispose of the assets securing such Indebtedness; (11)
customary provisions in joint venture agreements, licenses and leases and other
similar agreements entered into in the ordinary course of business; (12) net
worth provisions in leases and other agreements entered into by the Company or
any Restricted Subsidiary; and (13) an agreement governing Indebtedness
(including any Credit Facilities) permitted to be incurred pursuant to Section
4.04; provided that provi-
      --------

                                     -67-
<PAGE>

sions relating to such encumbrance or restriction contained in such Indebtedness
are no less favorable to the Company in any material respect as determined by
senior management of the Company in its reasonable and good faith judgment than
the provisions contained in the Credit Agreement as in effect on the Issue Date.

SECTION 4.14.  Limitation on Liens.
               -------------------

          The Company shall not, and shall not cause or permit any of its
Restricted Subsidiaries to, directly or indirectly, create, incur, assume or
permit or suffer to exist any Liens of any kind against or upon any property or
assets of the Company or any of its Restricted Subsidiaries whether owned on the
Issue Date or acquired after the Issue Date, or any proceeds therefrom, or
assign or otherwise convey any right to receive income or profits therefrom
unless (i) in the case of Liens securing Indebtedness that is expressly
subordinate or junior in right of payment to the Securities, the Securities are
secured by a Lien on such property, assets or proceeds that is senior in
priority to such Liens and (ii) in all other cases, the Securities are equally
and ratably secured, except for (A) Liens existing as of the Issue Date to the
extent and in the manner such Liens are in effect on the Issue Date; (B) Liens
securing Senior Debt and Liens securing Guarantor Senior Debt; (C) Liens
securing the Securities and the Guarantees; (D) Liens of the Company or a Wholly
Owned Restricted Subsidiary of the Company on assets of any Restricted
Subsidiary of the Company; (E) Liens securing Refinancing Indebtedness which is
incurred to Refinance any Indebtedness which has been secured by a Lien
permitted under this Indenture and which has been incurred in accordance with
the provisions of this Indenture; provided, however, that such Liens (x) are no
                                  --------  -------
less favorable to the Holders and are not more favorable to the lienholders with
respect to such Liens than the Liens in respect of the Indebtedness being
Refinanced and (y) do not extend to or cover any property or assets of the
Company or any of its Restricted Subsidiaries not securing the Indebtedness so
Refinanced; and (F) Permitted Liens.

                                     -68-
<PAGE>

SECTION 4.15.  Change of Control.
               -----------------

          (a)  Upon the occurrence of a Change of Control, the Company shall be
obligated to make an offer to purchase (the "Change of Control Offer"), and
                                             -----------------------
shall purchase, on a Business Day (the "Change of Control Payment Date") as
                                        ------------------------------
described below, all of the then outstanding Securities at a purchase price
equal to 101% of the principal amount thereof, plus accrued and unpaid interest,
if any, thereon to the Change of Control Payment Date.  The Change of Control
Offer shall remain open for at least 20 Business Days and until the close of
business on the Change of Control Payment Date.

          (b)  Prior to the mailing of the notice referred to below, but in any
event within 30 days following any Change of Control, the Company covenants to
(i) repay in full and terminate all commitments under Indebtedness under the
Credit Agreement and all other Senior Debt the terms of which require repayment
upon a Change of Control or offer to repay in full and terminate all commitments
under all Indebtedness under the Credit Agreement and all other such Senior Debt
and to repay the Indebtedness owed to each lender which has accepted such offer
or (ii) obtain the requisite consents under the Credit Agreement and all other
Senior Debt to permit the repurchase of the Securities as provided below.  The
Company shall first comply with the covenant in the immediately preceding
sentence before it shall be required to repurchase Securities pursuant to the
provisions described below.  The Company's failure to comply with the covenant
described in the second preceding sentence (and any failure to send the notice
referred to in clause (c) below because same is prohibited by the second
preceding sentence) may (with notice and lapse of time) constitute an Event of
Default described in clause (c) of Section 6.01 but shall not constitute an
Event of Default described in clause (b) of Section 6.01.

          (c)  Within 30 days following the date upon which a Change of Control
occurs (the "Change of Control Date"), the Company shall send, by first class
             ----------------------
mail, a notice to each Holder, with a copy to the Trustee, which notice shall
govern the terms of the Change of Control Offer.  The notice to the Holders
shall contain all instructions and materials necessary

                                     -69-
<PAGE>

to enable such Holders to tender Securities pursuant to the Change of Control
Offer. Such notice shall state:

             (1) that the Change of Control Offer is being made pursuant to this
     Section 4.15 and that all Securities tendered and not withdrawn will be
     accepted for payment;

             (2) the purchase price (including the amount of accrued interest)
     and the Change of Control Payment Date, which shall be a Business Day, that
     is not earlier than 30 days or later than 60 days from the date such notice
     is mailed;

             (3) that any Security not tendered will continue to accrue
     interest;

             (4) that, unless the Company defaults in making payment therefor,
     any Security accepted for payment pursuant to the Change of Control Offer
     shall cease to accrue interest after the Change of Control Payment Date;

             (5) that Holders electing to have a Security purchased pursuant to
     a Change of Control Offer will be required to surrender the Security, with
     the form entitled "Option of Holder to Elect Purchase" on the reverse of
     the Security completed, to the Paying Agent at the address specified in the
     notice prior to the close of business on the third Business Day prior to
     the Change of Control Payment Date;

             (6) that Holders will be entitled to withdraw their election if the
     Paying Agent receives, not later than the second Business Day prior to the
     Change of Control Payment Date, a telegram, telex, facsimile transmission
     or letter setting forth the name of the Holder, the principal amount of the
     Securities the Holder delivered for purchase and a statement that such
     Holder is withdrawing his election to have such Security purchased;

             (7) that Holders whose Securities are purchased only in part will
     be issued new Securities in a principal amount equal to the unpurchased
     portion of the Securities surrendered; and

                                     -70-
<PAGE>

          (8)  the circumstances and relevant facts regarding such Change of
     Control.

          On or before the Change of Control Payment Date, the Company shall (i)
accept for payment Securities or portions thereof tendered pursuant to the
Change of Control Offer, (ii) deposit with the Paying Agent U.S. Legal Tender
sufficient to pay the purchase price plus accrued interest, if any, of all
Securities so tendered and (iii) deliver to the Trustee Securities so accepted
together with an Officers' Certificate stating the Securities or portions
thereof being purchased by the Company.  The Paying Agent shall promptly mail to
the Holders of Securities so accepted payment in an amount equal to the purchase
price plus accrued interest, if any, and upon written order of the Company the
Trustee shall promptly authenticate and mail to such Holders new Securities
equal in principal amount to any unpurchased portion of the Securities
surrendered.  Any Securities not so accepted shall be promptly mailed by the
Company to the Holder thereof.  For purposes of this Section 4.15, the Trustee
shall act as the Paying Agent.

          Any amounts remaining with the Paying Agent after the purchase of
Securities pursuant to a Change of Control Offer shall be returned by the
Trustee to the Company.

          The Company shall comply with the requirements of Rule 14e-1 under the
Exchange Act and any other securities laws and regulations thereunder to the
extent such laws and regulations are applicable in connection with the
repurchase of Securities pursuant to a Change of Control Offer.  To the extent
the provisions of any securities laws or regulations conflict with the
provisions of this Section 4.15, the Company shall comply with the applicable
securities laws and regulations and shall not be deemed to have breached its
obligations under this Section 4.15 by virtue thereof.

SECTION 4.16.  Limitation on Asset Sales.
               -------------------------

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, consummate an Asset Sale unless (i) the Company or the
applicable Restricted Subsidiary, as the case may be, receives consideration at
the time of such Asset Sale at least equal to the fair market value of the
assets sold

                                     -71-
<PAGE>

or otherwise disposed of (as determined in good faith by senior management or,
in the case of an Asset Sale in excess of $5 million, by the Company's Board of
Directors); (ii) at least 75% of the consideration received by the Company or
the Restricted Subsidiary, as the case may be, from such Asset Sale shall be in
the form of cash or Cash Equivalents and is received at the time of such
disposition; provided that the amount of (a) any liabilities (as shown on the
             --------
Company's or such Restricted Subsidiary's most recent balance sheet) of the
Company or any Restricted Subsidiary (other than liabilities that are by their
terms subordinated to the Securities) that are assumed by the transferee of any
such assets, and (b) any notes or other obligations received by the Company or
any such Restricted Subsidiary from such transferee that are converted by the
Company or such Restricted Subsidiary into cash within 180 days after such Asset
Sale (to the extent of the cash received) shall be deemed to be cash for the
purposes of this provision; and (iii) upon the consummation of an Asset Sale,
the Company shall apply, or cause such Restricted Subsidiary to apply, the Net
Cash Proceeds relating to such Asset Sale within 360 days of receipt thereof
either (A) to prepay any Senior Debt or Guarantor Senior Debt and, in the case
of any Senior Debt or Guarantor Senior Debt under any revolving credit facility,
effect a permanent reduction in the availability under such revolving credit
facility, (B) to make an Investment in properties and assets that replace the
properties and assets that were the subject of such Asset Sale or in properties
and assets that will be used in the business of the Company and its Restricted
Subsidiaries as existing on the Issue Date or in businesses reasonably related,
complementary or ancillary thereto or a reasonable expansion thereof
("Replacement Assets"), and/or (C) a combination of prepayment and investment
  ------------------
permitted by the foregoing clauses (iii)(A) and (iii)(B). On the 361st day after
an Asset Sale or such earlier date, if any, as the senior management or Board of
Directors, as the case may be, of the Company or of such Restricted Subsidiary
determines not to apply the Net Cash Proceeds relating to such Asset Sale as set
forth in clauses (iii)(A), (iii)(B) and (iii)(C) of the next preceding sentence
(each, a "Net Proceeds Offer Trigger Date"), such aggregate amount of Net Cash
          -------------------------------
Proceeds which have not been applied on or before such Net Proceeds Offer
Trigger Date as permitted in clauses (iii)(A), (iii)(B) and (iii)(C) of the next
preceding sentence (each a "Net Proceeds Offer Amount") shall be applied by the
                            -------------------------
Company or such Restricted Subsidiary to make an offer to purchase (the "Net
                                                                         ---
Proceeds Offer") on a date (the "Net Proceeds Offer Payment Date") not less than
--------------                   -------------------------------
30 nor more than 60 days following the applicable Net

                                     -72-
<PAGE>

Proceeds Offer Trigger Date, from all Holders on a pro rata basis, that amount
                                                   --- ----
of Securities equal to the Net Proceeds Offer Amount at a price equal to 100% of
the principal amount of the Securities to be purchased, plus accrued and unpaid
interest thereon, if any, to the date of purchase; provided, however, that if at
                                                   --------  -------
any time any non-cash consideration received by the Company or any Restricted
Subsidiary of the Company, as the case may be, in connection with any Asset Sale
is converted into or sold or otherwise disposed of for cash (other than interest
received with respect to any such non-cash consideration), then such conversion
or disposition shall be deemed to constitute an Asset Sale hereunder and the Net
Cash Proceeds thereof shall be applied in accordance with this Section 4.16. The
Company may defer the Net Proceeds Offer until there is an aggregate unutilized
Net Proceeds Offer Amount equal to or in excess of $10.0 million resulting from
one or more Asset Sales (at which time, the entire unutilized Net Proceeds Offer
Amount, and not just the amount in excess of $10.0 million, shall be applied as
required pursuant to this paragraph).

          In the event of the transfer of substantially all (but not all) of the
property and assets of the Company and its Restricted Subsidiaries as an
entirety to a Person in a transaction permitted under Section 5.01, which
transaction does not constitute a Change of Control, the successor corporation
shall be deemed to have sold the properties and assets of the Company and its
Restricted Subsidiaries not so transferred for purposes of this Section 4.16,
and shall comply with the provisions of this Section 4.16 with respect to such
deemed sale as if it were an Asset Sale.  In addition, the fair market value of
such properties and assets of the Company or its Restricted Subsidiaries deemed
to be sold shall be deemed to be Net Cash Proceeds for purposes of this Section
4.16.

          Notwithstanding the first two paragraphs of this Section 4.16, the
Company and its Restricted Subsidiaries will be permitted to consummate an Asset
Sale without complying with such paragraphs to the extent that:

          (1) at least 75% of the consideration for such Asset Sale constitutes
     Replacement Assets; and

          (2) such Asset Sale is for fair market value;

                                     -73-
<PAGE>

provided that any consideration not constituting Replacement Assets received by
--------
the Company or any of its Restricted Subsidiaries in connection with any Asset
Sale permitted to be consummated under this paragraph shall constitute Net Cash
Proceeds subject to the provisions of the first two paragraphs of this Section
4.16.

          Notice of each Net Proceeds Offer pursuant to this Section 4.16 shall
be mailed or caused to be mailed, by first class mail, by the Company within 30
days following the applicable Net Proceeds Offer Trigger Date to all Holders at
their last registered addresses, with a copy to the Trustee.  A Net Proceeds
Offer shall remain open for a period of 20 Business Days or such longer period
as may be required by law.  The notice shall contain all instructions and
materials necessary to enable such Holders to tender Securities pursuant to the
Net Proceeds Offer and shall state the following terms:

          (1)  that the Net Proceeds Offer is being made pursuant to this
     Section 4.16 and that all Securities tendered will be accepted for payment;
     provided, however, that if the principal amount of Securities tendered in
     --------  -------
     the Net Proceeds Offer exceeds the aggregate amount of Net Proceeds Offer
     Amount, the Company shall select the Securities to be purchased on a pro
     rata basis;

          (2)  the purchase price (including the amount of accrued interest, if
     any) and the purchase date (which shall be no earlier than 30 days nor
     later than 60 days from the date such notice is mailed, other than as may
     be required by applicable law);

          (3)  that any Security not tendered will continue to accrue interest;

          (4)  that, unless the Company defaults in making payment therefor, any
     Security accepted for payment pursuant to the Net Proceeds Offer shall
     cease to accrue interest after the Net Proceeds Offer Payment Date;

          (5)  that Holders electing to have a Security purchased pursuant to
     the Net Proceeds Offer will be required

                                     -74-
<PAGE>

     to surrender the Security, with the form entitled "Option of Holder to
     Elect Purchase" on the reverse of the Security completed, to the Paying
     Agent at the address specified in the notice prior to the close of business
     on the Net Proceeds Offer Payment Date;

          (6)  that Holders will be entitled to withdraw their election if the
     Paying Agent receives, not later than the second Business Day prior to the
     Net Proceeds Offer Payment Date, a facsimile transmission or letter setting
     forth the name of the Holder, the principal amount of the Security the
     Holder delivered for purchase and a statement that such Holder is
     withdrawing his election to have such Security purchased; and

          (7)  that Holders whose Securities are purchased only in part will be
     issued new Securities in a principal amount at maturity equal to the
     unpurchased portion of the Securities surrendered.

          On or before the Net Proceeds Offer Payment Date, the Company shall
(i) accept for payment Securities or portions thereof tendered pursuant to the
Net Proceeds Offer, (ii) deposit with the Paying Agent U.S. Legal Tender
sufficient to pay the purchase price, plus accrued interest, if any, of all
Securities to be purchased and (iii) deliver to the Trustee Securities so
accepted together with an Officers' Certificate stating the Securities or
portions thereof being purchased by the Company.  The Paying Agent shall
promptly mail to the Holders of Securities so accepted payment in an amount
equal to the purchase price, plus accrued interest, if any, thereon set forth in
the notice of such Net Proceeds Offer.  Any Security not so accepted shall be
promptly mailed by the Company to the Holder thereof.  For purposes of this
Section 4.16, the Trustee shall act as the Paying Agent.  Any amounts remaining
after the purchase of Securities pursuant to a Net Proceeds Offer shall be
returned by the Trustee to the Company.

          The Company will comply with the requirements of Rule 14e-1 under the
Exchange Act and any other securities laws and regulations thereunder to the
extent such laws and regulations are applicable in connection with the
repurchase of Securities

                                     -75-
<PAGE>

pursuant to a Net Proceeds Offer. To the extent that the provisions of any
securities laws or regulations conflict with the provisions of this Section
4.16, the Company shall comply with the applicable securities laws and
regulations and shall not be deemed to have breached its obligations under this
Section 4.16 by virtue thereof.

SECTION 4.17.  Prohibition on Incurrence of Senior Subordinated Debt.
               -----------------------------------------------------

          The Company shall not, and shall not permit any Restricted Subsidiary
that is a Guarantor to, incur or suffer to exist Indebtedness that is senior in
right of payment to the Securities or such Guarantor's Guarantee, as the case
may be, and subordinate in right of payment to any other Indebtedness of the
Company or such Guarantor, as the case may be.

SECTION 4.18.  Additional Subsidiary Guarantees.
               --------------------------------

          If the Company or any of its Restricted Subsidiaries transfers or
causes to be transferred, in one transaction or a series of related
transactions, any property to any Domestic Restricted Subsidiary that is not a
Guarantor, or if the Company or any of its Restricted Subsidiaries shall
organize, acquire or otherwise invest in another Domestic Restricted Subsidiary
having total assets with a book value in excess of $1 million, then such
transferee or acquired or other Restricted Subsidiary shall (i) execute and
deliver to the Trustee a supplemental indenture pursuant to which such
Restricted Subsidiary shall unconditionally guarantee all of the Company's
obligations under the Securities and this Indenture on the terms set forth in
this Indenture and (ii) deliver to the Trustee an Opinion of Counsel that such
supplemental indenture has been duly authorized, executed and delivered by such
Restricted Subsidiary and constitutes a legal, valid, binding and enforceable
obligation of such Restricted Subsidiary.  Thereafter, such Restricted
Subsidiary shall be a Guarantor for all purposes of this Indenture.

SECTION 4.19.  Conduct of Business.
               -------------------

          The Company and its Restricted Subsidiaries shall not engage in any
businesses which are not substantially related, ancillary or complementary to
the businesses in which the Com-

                                     -76-
<PAGE>

pany and its Restricted Subsidiaries are engaged on the Issue Date or a
reasonable expansion thereof.

                                 ARTICLE FIVE

                             SUCCESSOR CORPORATION

SECTION 5.01.  Merger, Consolidation and Sale of Assets.
               ----------------------------------------

          (a)  The Company shall not, in a single transaction or series of
related transactions, consolidate or merge with or into any Person, or sell,
assign, transfer, lease, convey or otherwise dispose of (or cause or permit any
Restricted Subsidiary of the Company to sell, assign, transfer, lease, convey or
otherwise dispose of) all or substantially all of the Company's assets
(determined on a consolidated basis for the Company and the Company's Restricted
Subsidiaries) whether as an entirety or substantially as an entirety to any
Person unless:  (i) either (1) the Company shall be the surviving or continuing
corporation or (2) the Person (if other than the Company) formed by such
consolidation or into which the Company is merged or the Person which acquires
by sale, assignment, transfer, lease, conveyance or other disposition the
properties and assets of the Company and of the Company's Restricted
Subsidiaries substantially as an entirety (the "Surviving Entity"); (x) shall be
                                                ----------------
a corporation, partnership, trust or a limited liability company organized and
validly existing under the laws of the United States or any State thereof or the
District of Columbia and (y) shall expressly assume, by supplemental indenture,
executed and delivered to the Trustee, the due and punctual payment of the
principal of, and premium, if any, and interest on all of the Securities and the
performance of every covenant of the Securities, this Indenture and the
Registration Rights Agreement on the part of the Company to be performed or
observed; provided that if at any time the Company or the Surviving Entity is a
          --------
limited liability company, partnership or trust, there shall be a co-issuer of
the Securities that is a Restricted Subsidiary of the Company and that is a
corporation organized and existing under the laws of the United States or any
State thereof or

                                     -77-
<PAGE>

the District of Columbia; (ii) immediately after giving effect to such
transaction and the assumption contemplated by clause (i)(2)(y) above (including
giving effect to any Indebtedness and Acquired Indebtedness incurred or
anticipated to be incurred in connection with or in respect of such
transaction), the Company or such Surviving Entity, as the case may be shall be
able to incur at least $1.00 of additional Indebtedness (other than Permitted
Indebtedness) pursuant to Section 4.04; (iii) immediately before and immediately
after giving effect to such transaction and the assumption contemplated by
clause (i)(2)(y) above (including, without limitation, giving effect to any
Indebtedness and Acquired Indebtedness incurred or anticipated to be incurred
and any Lien granted in connection with or in respect of the transaction), no
Default or Event of Default shall have occurred or be continuing; and (iv) the
Company or the Surviving Entity shall have delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that such consolidation,
merger, sale, assignment, transfer, lease, conveyance or other disposition and,
if a supplemental indenture is required in connection with such transaction,
such supplemental indenture comply with the applicable provisions of this
Indenture and that all conditions precedent in this Indenture relating to such
transaction have been satisfied. Notwithstanding the foregoing, the merger of
the Company with an Affiliate incorporated solely for the purpose of
reincorporating the Company in another jurisdiction shall be permitted.

          (b)  For purposes of the foregoing paragraph (a), the transfer (by
lease, assignment, sale or otherwise, in a single transaction or series of
transactions) of all or substantially all of the properties or assets of one or
more Restricted Subsidiaries of the Company the Capital Stock of which
constitutes all or substantially all of the properties and assets of the
Company, shall be deemed to be the transfer of all or substantially all of the
properties and assets of the Company.

          (c)  Each Guarantor (other than any Guarantor whose Guarantee is to be
released in accordance with the terms of the Guarantee and this Indenture in
connection with any transaction complying with the provisions of Section 4.16)
shall not, and the Company shall not cause or permit any Guarantor to,
con-

                                     -78-
<PAGE>

solidate with or merge with or into any Person other than the Company or any
other Guarantor unless: (i) the entity formed by or surviving any such
consolidation or merger (if other than the Guarantor) is a corporation,
partnership, trust or limited liability company organized and existing under the
laws of the United States or any State thereof or the District of Columbia; (ii)
such entity assumes by supplemental indenture all of the obligations of the
Guarantor on the Guarantee; (iii) immediately after giving effect to such
transaction, no Default or Event of Default shall have occurred and be
continuing; and (iv) immediately after giving effect to such transaction and the
use of any net proceeds therefrom on a pro forma basis, the Company could
                                       --- -----
satisfy the provisions of clause (a) (ii) of this Section 5.01.  Any merger or
consolidation of a Guarantor with and into the Company (with the Company being
the surviving entity) or another Guarantor that is a Wholly Owned Restricted
Subsidiary of the Company need only comply with clause (a) (iv) of Section 5.01.

SECTION 5.02.  Successor Corporation Substituted.
               ---------------------------------

          Upon any consolidation, combination or merger or any transfer of all
or substantially all of the assets of the Company in accordance with Section
5.01 in which the Company is not the continuing corporation, the successor
Person formed by such consolidation or into which the Company is merged or to
which such conveyance, lease or transfer is made shall succeed to, and be
substituted for, and may exercise every right and power of, the Company under
this Indenture and the Securities with the same effect as if such Surviving
Entity had been named as such.

                                  ARTICLE SIX

                              DEFAULT AND REMEDIES

SECTION 6.01.  Events of Default.
               -----------------

          Each of the following shall be an "Event of Default":
                                             ----------------

                                     -79-
<PAGE>

          (a)  the failure to pay interest on any Securities when the same
     becomes due and payable and the default continues for a period of 30 days
     (whether or not such payment shall be prohibited by Article Ten or Article
     Twelve of this Indenture);

          (b)  the failure to pay the principal on any Securities, when such
     principal becomes due and payable, at maturity, upon redemption or
     otherwise (including the failure to make a payment to purchase Securities
     tendered pursuant to a Change of Control Offer or a Net Proceeds Offer on
     the date specified for such payment in the applicable offer to purchase)
     (whether or not such payment shall be prohibited by Article Ten or Article
     Twelve of this Indenture);

          (c)  a default in the observance or performance of any other covenant
     or agreement contained in this Indenture, which default continues for a
     period of 30 days after the Company receives written notice specifying the
     default (and demanding that such default be remedied) from the Trustee or
     the Holders of at least 25% of the outstanding principal amount of the
     Securities;

          (d)  the failure to pay at final maturity (giving effect to any
     applicable grace periods and any extensions thereof) the principal amount
     of any Indebtedness of the Company or any Significant Subsidiary of the
     Company which failure continues for at least 20 days, or the acceleration
     of the final stated maturity of any such Indebtedness (which acceleration
     is not rescinded, annulled or otherwise cured within 20 days of receipt by
     the Company or such Significant Subsidiary of notice of any such
     acceleration) if the aggregate principal amount of such Indebtedness,
     together with the principal amount of any other such Indebtedness in
     default for failure to pay principal at final maturity or which has been
     accelerated (in each case with respect to which the 20-day period described
     above has passed), aggregates $10.0 million or more at any time;

                                     -80-
<PAGE>

          (e)  one or more judgments in an aggregate amount in excess of $10.0
     million (exclusive of amounts covered by insurance) shall have been
     rendered against the Company or any of its Significant Subsidiaries and
     such judgments remain undischarged, unpaid or unstayed for a period of 60
     days after such judgment or judgments become final and non-appealable;

          (f)  the Company or any of its Significant Subsidiaries (i) commences
     a voluntary case or proceeding under any Bankruptcy Law with respect to
     itself, (ii) consents to the entry of a judgment, decree or order for
     relief against it in an involuntary case or proceeding under any Bankruptcy
     Law, (iii) consents to the appointment of a custodian of it or for
     substantially all of its property, (iv) consents to or acquiesces in the
     institution of a bankruptcy or an insolvency proceeding against it, (v)
     makes a general assignment for the benefit of its creditors or (vi) takes
     any corporate action to authorize or effect any of the foregoing;

          (g)  a court of competent jurisdiction enters a judgment, decree or
     order for relief in respect of the Company or any of its Significant
     Subsidiaries in an involuntary case or proceeding under any Bankruptcy Law,
     which shall (i) approve as properly filed a petition seeking
     reorganization, arrangement, adjustment or composition in respect of the
     Company or any of its Significant Subsidiaries, (ii) appoint a Custodian of
     the Company or any of its Significant Subsidiaries or for substantially all
     of any of its property or (iii) order the winding-up or liquidation of its
     affairs; and such judgment, decree or order shall remain unstayed and in
     effect for a period of 60 consecutive days; or

          (h)  any Guarantee of a Significant Subsidiary ceases to be in full
     force and effect or any Guarantee of a Significant Subsidiary is declared
     to be null and void and unenforceable or any Guarantee of a Significant
     Subsidiary is found to be invalid or any Guarantor that is a Significant
     Subsidiary denies its liability under its Guarantee

                                     -81-
<PAGE>

     (other than by reason of release of a Guarantor in accordance with the
     terms of this Indenture).

SECTION 6.02.  Acceleration.
               ------------

          If an Event of Default (other than an Event of Default specified in
either clause (f) or (g) of Section 6.01 above with respect to the Company)
shall occur and be continuing, the Trustee or the Holders of at least 25% in
principal amount of outstanding Securities may declare the principal of and
accrued interest on all the Securities to be due and payable by notice in
writing to the Company (and the Trustee if given by the Holders) specifying the
respective Event of Default and that it is a "notice of acceleration" (the
"Acceleration Notice"), and the same (i) shall become immediately due and
 -------------------
payable or (ii) if there are any amounts outstanding under the Credit Agreement,
shall become immediately due and payable upon the first to occur of an
acceleration under the Credit Agreement or 5 business days after receipt by the
Company and the Representative under the Credit Agreement of such Acceleration
Notice but only if such Event of Default is then continuing.  If an Event of
Default specified in either clause (f) or (g) of Section 6.01 above with respect
to the Company occurs and is continuing, then all unpaid principal of, and
premium, if any, and accrued and unpaid interest on all of the outstanding
Securities shall ipso facto become and be immediately due and payable without
                 ---- -----
any declaration or other act on the part of the Trustee or any Holder.

          At any time after a declaration of acceleration with respect to the
Securities as described in the preceding paragraph, the Holders of a majority in
principal amount of the Securities may rescind and cancel such declaration and
its consequences (i) if the rescission would not conflict with any judgment or
decree, (ii) if all existing Events of Default have been cured or waived except
nonpayment of principal or interest that has become due solely because of the
acceleration, (iii) to the extent the payment of such interest is lawful,
interest on overdue installments of interest and overdue principal, which has
become due otherwise than by such declaration of acceleration, has been paid,
(iv) if the Company has paid the Trustee its reasonable compensation and
reimbursed the Trustee

                                     -82-
<PAGE>

for its expenses, disbursements and advances and (v) in the event of the cure or
waiver of an Event of Default of the type described in either clause (f) or (g)
of Section 6.01, the Trustee shall have received an Officers' Certificate and an
Opinion of Counsel that such Event of Default has been cured or waived. No such
rescission shall affect any subsequent Default or impair any right consequent
thereto.

SECTION 6.03.  Other Remedies.
               --------------

          If an Event of Default occurs and is continuing, the Trustee may
pursue any available remedy by proceeding at law or in equity to collect the
payment of principal of or interest on the Securities or to enforce the
performance of any provision of the Securities or this Indenture.

          The Trustee may maintain a proceeding even if it does not possess any
of the Securities or does not produce any of them in the proceeding.  A delay or
omission by the Trustee or any Securityholder in exercising any right or remedy
accruing upon an Event of Default shall not impair the right or remedy or
constitute a waiver of or acquiescence in the Event of Default.  No remedy is
exclusive of any other remedy.  All available remedies are cumulative to the
extent permitted by law.

SECTION 6.04.  Waiver of Past Defaults.
               -----------------------

          Subject to Sections 2.09, 6.07 and 9.02, the Holders of not less than
a majority in principal amount of the outstanding Securities by notice to the
Trustee may waive an existing Default or Event of Default and its consequences,
except a Default in the payment of principal of or interest on any Security as
specified in clauses (a) and (b) of Section 6.01.  The Company shall deliver to
the Trustee an Officers' Certificate stating that the requisite percentage of
Holders have consented to such waiver and attaching copies of such consents.
When a Default or Event of Default is waived, it is cured and ceases.

SECTION 6.05.  Control by Majority.
               -------------------

          The Holders of not less than a majority in principal amount of the
outstanding Securities may direct the time,

                                     -83-
<PAGE>

method and place of conducting any proceeding for any remedy available to the
Trustee or exercising any trust or power conferred on it. Subject to Section
7.01, however, the Trustee may refuse to follow any direction that conflicts
with any law or this Indenture, that the Trustee determines may be unduly
prejudicial to the rights of another Securityholder, or that may involve the
Trustee in personal liability; provided that the Trustee may take any other
                               --------
action deemed proper by the Trustee which is not inconsistent with such
direction.

          In the event the Trustee takes any action or follows any direction
pursuant to this Indenture, the Trustee shall be entitled to indemnification
satisfactory to it in its sole discretion against any loss or expense caused by
taking such action or following such direction.

SECTION 6.06.  Limitation on Suits.
               -------------------

          A Securityholder may not pursue any remedy with respect to this
Indenture or the Securities unless:

          (1)  the Holder gives to the Trustee written notice of a continuing
     Event of Default;

          (2)  the Holder or Holders of at least 25% in principal amount of the
     outstanding Securities make a written request to the Trustee to pursue the
     remedy;

          (3)  such Holder or Holders offer and, if requested, provide to the
     Trustee indemnity satisfactory to the Trustee against any loss, liability
     or expense;

          (4)  the Trustee does not comply with the request within 45 days after
     receipt of the request and the offer and, if requested, the provision of
     indemnity; and

          (5)  during such 45-day period the Holder or Holders of a majority
     in principal amount of the outstanding Securities do not give the Trustee a
     direction which, in the opinion of the Trustee, is inconsistent with the
     request.

                                     -84-
<PAGE>

          A Securityholder may not use this Indenture to prejudice the rights of
another Securityholder or to obtain a preference or priority over such other
Securityholder.

SECTION 6.07.  Rights of Holders To Receive Payment.
               ------------------------------------

          Notwithstanding any other provision of this Indenture, the right of
any Holder to receive payment of principal of and interest on a Security, on or
after the respective due dates expressed in such Security, or to bring suit for
the enforcement of any such payment on or after such respective dates, shall not
be impaired or affected without the consent of the Holder.

SECTION 6.08.  Collection Suit by Trustee.
               --------------------------

          If an Event of Default in payment of principal or interest specified
in clause (a) or (b) of Section 6.01 occurs and is continuing, the Trustee may
recover judgment in its own name and as trustee of an express trust against the
Company or any other obligor on the Securities for the whole amount of principal
and accrued interest and fees remaining unpaid, together with interest on
overdue principal and, to the extent that payment of such interest is lawful,
interest on overdue installments of interest, in each case at the rate per annum
                                                                       --- -----
borne by the Securities and such further amount as shall be sufficient to cover
the costs and expenses of collection, including the reasonable compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel.

SECTION 6.09.  Trustee May File Proofs of Claim.
               --------------------------------

          The Trustee may file such proofs of claim and other papers or
documents as may be necessary or advisable in order to have the claims of the
Trustee (including any claim for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel) and the
Securityholders allowed in any judicial proceedings relating to the Company, its
creditors or its property and shall be entitled and empowered to collect and
receive any monies or other property payable or deliverable on any such claims
and to distribute the same, and any Custodian in any such judicial proceedings
is

                                     -85-
<PAGE>

hereby authorized by each Securityholder to make such payments to the Trustee
and, in the event that the Trustee shall consent to the making of such payments
directly to the Securityholders, to pay to the Trustee any amount due to it for
the reasonable compensation, expenses, disbursements and advances of the
Trustee, its agent and counsel, and any other amounts due the Trustee under
Section 7.07.  Nothing herein contained shall be deemed to authorize the Trustee
to authorize or consent to or accept or adopt on behalf of any Securityholder
any plan of reorganization, arrangement, adjustment or composition affecting the
Securities or the rights of any Holder thereof, or to authorize the Trustee to
vote in respect of the claim of any Securityholder in any such proceeding.

SECTION 6.10.  Priorities.
               ----------

          If the Trustee collects any money or property pursuant to this Article
Six, it shall pay out the money or property in the following order:

          First:  to the Trustee for amounts due under Section 7.07;

          Second:  to Holders for interest accrued on the Securities, ratably,
     without preference or priority of any kind, according to the amounts due
     and payable on the Securities for interest;

          Third:  to Holders for principal amounts due and unpaid on the
     Securities, ratably, without preference or priority of any kind, according
     to the amounts due and payable on the Securities for principal; and

          Fourth:  to the Company or, if applicable, the Guarantors, as their
     respective interests may appear.

          The Trustee, upon prior notice to the Company, may fix a record date
and payment date for any payment to Securityholders pursuant to this Section
6.10.

                                     -86-
<PAGE>

SECTION 6.11.  Undertaking for Costs.
               ---------------------

          In any suit for the enforcement of any right or remedy under this
Indenture or in any suit against the Trustee for any action taken or omitted by
it as Trustee, a court in its discretion may require the filing by any party
litigant in the suit of an undertaking to pay the costs of the suit, and the
court in its discretion may assess reasonable costs, including reasonable
attorneys' fees, against any party litigant in the suit, having due regard to
the merits and good faith of the claims or defenses made by the party litigant.
This Section 6.11 does not apply to a suit by the Trustee, a suit by a Holder
pursuant to Section 6.07, or a suit by a Holder or Holders of more than 10% in
principal amount of the outstanding Securities.


                                 ARTICLE SEVEN

                                    TRUSTEE

SECTION 7.01.  Duties of Trustee.
               -----------------

          (a)  If a Default or an Event of Default has occurred and is
continuing, the Trustee shall exercise such of the rights and powers vested in
it by this 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 or her own affairs.

          (b)  Except during the continuance of a Default or an Event of
Default:

          (1)  The Trustee need perform only those duties as are specifically
     set forth herein or in the TIA and no duties, covenants, responsibilities
     or obligations shall be implied in this Indenture against the Trustee.

          (2)  In the absence of bad faith on its part, the Trustee may
     conclusively rely, as to the truth of the statements and the correctness of
     the opinions expressed therein, upon certificates (including Officers'
     Certifi-

                                     -87-
<PAGE>

     cates) or opinions (including Opinions of Counsel) furnished to the Trustee
     and conforming to the requirements of this Indenture. However, the Trustee
     shall examine the certificates and opinions to determine whether or not
     they conform to the requirements of this Indenture.

          (c)  Notwithstanding anything to the contrary herein, the Trustee may
not be relieved from liability for its own negligent action, its own negligent
failure to act, or its own willful misconduct, except that:

          (1)  This paragraph does not limit the effect of paragraph (b) of
     this Section 7.01.

          (2)  The Trustee shall not be liable for any error of judgment made
     in good faith by a Responsible Officer, unless it is proved that the
     Trustee was negligent in ascertaining the pertinent facts.

          (3)  The Trustee shall not be liable with respect to any action it
     takes or omits to take in good faith in accordance with a direction
     received by it pursuant to Section 6.05.

          (d)  No provision of this Indenture shall require the Trustee to
expend or risk its own funds or otherwise incur any financial liability in the
performance of any of its duties hereunder or to take or omit to take any action
under this Indenture or take any action at the request or direction of Holders
if it shall have reasonable grounds for believing that repayment of such funds
is not assured to it.

          (e)  Every provision of this Indenture that in any way relates to the
Trustee is subject to this Section 7.01.

          (f)  The Trustee shall not be liable for interest on any money
received by it except as the Trustee may agree in writing with the Company.
Money held in trust by the Trustee need not be segregated from other funds
except to the extent required by law.

          (g)  In the absence of bad faith, negligence or willful misconduct on
the part of the Trustee, the Trustee shall

                                     -88-
<PAGE>

not be responsible for the application of any money by any Paying Agent other
than the Trustee.

SECTION 7.02.  Rights of Trustee.
               -----------------

          Subject to Section 7.01:

          (a)  The Trustee may rely on any document believed by it to be genuine
     and to have been signed or presented by the proper Person.  The Trustee
     need not investigate any fact or matter stated in the document.

          (b)  Before the Trustee acts or refrains from acting, it may require
     an Officers' Certificate and an Opinion of Counsel, which shall conform to
     the provisions of Section 13.05.  The Trustee shall not be liable for any
     action it takes or omits to take in good faith in reliance on such
     certificate or opinion.

          (c)  The Trustee may act through its attorneys and agents and shall
     not be responsible for the misconduct or negligence of any agent (other
     than an agent who is an employee of the Trustee) appointed with due care.

          (d)  The Trustee shall not be liable for any action it takes or omits
     to take in good faith which it reasonably believes to be authorized or
     within its rights or powers.

          (e)  The Trustee may consult with counsel and the advice or opinion of
     such counsel as to matters of law shall be full and complete authorization
     and protection from liability in respect of any action taken, omitted or
     suffered by it hereunder in good faith and in accordance with the advice or
     opinion of such counsel.

          (f)  The Trustee shall be under no obligation to exercise any of the
     rights or powers vested in it by this Indenture at the request, order or
     direction of any of the Holders pursuant to the provisions of this
     Indenture, unless such Holders shall have offered to the Trustee reasonable
     security or indemnity against the costs, expenses and liabilities which may
     be incurred therein or thereby.

                                     -89-
<PAGE>

          (g)  The Trustee shall not be bound to make any investigation into the
     facts or matters stated in any resolution, certificate (including any
     Officers' Certificate), statement, instrument, opinion (including any
     Opinion of Counsel), notice, request, direction, consent, order, bond,
     debenture, or other paper or document, but the Trustee, in its discretion,
     may make such further inquiry or investigation into such facts or matters
     as it may see fit and, if the Trustee shall determine to make such further
     inquiry or investigation, it shall be entitled, upon reasonable notice to
     the Company, to examine the books, records, and premises of the Company,
     personally or by agent or attorney.

          (h)  The Trustee shall not be required to give any bond or surety in
     respect of the performance of its powers and duties hereunder.

          (i)  The permissive rights of the Trustee to do things enumerated in
     this Indenture shall not be construed as duties.

SECTION 7.03.  Individual Rights of Trustee.
               ----------------------------

          The Trustee in its individual or any other capacity may become the
owner or pledgee of Securities and may otherwise deal with the Company, its
Subsidiaries, or their respective Affiliates with the same rights it would have
if it were not Trustee.  Any Agent may do the same with like rights.  However,
the Trustee must comply with Sections 7.10 and 7.11.

SECTION 7.04.  Trustee's Disclaimer.
               --------------------

          The Trustee shall not be responsible for and makes no representation
as to the validity or adequacy of this Indenture or the Securities, it shall not
be accountable for the Company's use of the proceeds from the Securities, and it
shall not be responsible for any statement of the Company in this Indenture or
any document issued in connection with the sale of Securities or any statement
in the Securities other than the Trustee's certificate of authentication.  The
Trustee makes no

                                     -90-
<PAGE>

representations with respect to the effectiveness or adequacy of this Indenture.

SECTION 7.05.  Notice of Default.
               -----------------

          If a Default or an Event of Default occurs and is continuing and the
Trustee receives actual notice of such Default or Event of Default, the Trustee
shall mail to each Securityholder notice of the uncured Default or Event of
Default within 60 days after such Default or Event of Default occurs.  Except in
the case of a Default or an Event of Default in payment of principal of, or
interest on, any Security, including an accelerated payment and the failure to
make payment on the Change of Control Payment Date pursuant to a Change of
Control Offer or the Net Proceeds Offer Payment Date pursuant to a Net Proceeds
Offer, the Trustee may withhold the notice if and so long as the Board of
Directors, the executive committee, or a trust committee of directors and/or
Responsible Officers, of the Trustee in good faith determines that withholding
the notice is in the interest of the Securityholders.

SECTION 7.06.  Reports by Trustee to Holders.
               -----------------------------

          Within 60 days after each May 15, beginning with the first May 15
following the date of this Indenture, the Trustee shall, to the extent that any
of the events described in TIA (S) 313(a) occurred within the previous twelve
months, but not otherwise, mail to each Securityholder a brief report dated as
of such date that complies with TIA (S) 313(a).  The Trustee also shall comply
with TIA (S)(S) 313(b), 313(c) and 313(d).

          A copy of each report at the time of its mailing to Securityholders
shall be mailed to the Company and filed with the Commission and each securities
exchange, if any, on which the Securities are listed.

          The Company shall notify the Trustee if the Securities become listed
on any securities exchange or of any delisting thereof and the Trustee shall
comply with TIA (S) 313(d).

                                     -91-
<PAGE>

SECTION 7.07.  Compensation and Indemnity.
               --------------------------

          The Company shall pay to the Trustee from time to time reasonable
compensation for its services hereunder.  The Trustee's compensation shall not
be limited by any law on compensation of a trustee of an express trust.  The
Company shall reimburse the Trustee upon request for all reasonable
disbursements, expenses and advances (including reasonable fees and expenses of
counsel) incurred or made by it in addition to the compensation for its
services, except any such disbursements, expenses and advances as may be
attributable to the Trustee's negligence, bad faith or willful misconduct.  Such
expenses shall include the reasonable fees and expenses of the Trustee's agents
and counsel.

          The Company shall indemnify the Trustee and its agents, employees,
officers, stockholders and directors for, and hold them harmless against, any
loss, liability or expense incurred by them except for such actions to the
extent caused by any negligence, bad faith or willful misconduct on their part,
arising out of or in connection with the acceptance or administration of this
trust including the reasonable costs and expenses of defending themselves
against or investigating any claim or liability in connection with the exercise
or performance of any of the Trustee's rights, powers or duties hereunder.  The
Trustee shall notify the Company promptly of any claim asserted against the
Trustee or any of its agents, employees, officers, stockholders and directors
for which it may seek indemnity.  The Company may, subject to the approval of
the Trustee, defend the claim and the Trustee shall cooperate in the defense.
The Trustee and its agents, employees, officers, stockholders and directors
subject to the claim may have separate counsel and the Company shall pay the
reasonable fees and expenses of such counsel; provided, however, that the
                                              --------  -------
Company will not be required to pay such fees and expenses if, subject to the
approval of the Trustee, it assumes the Trustee's defense and there is no
conflict of interest between the Company and the Trustee and its agents,
employees, officers, stockholders and directors subject to the claim in
connection with such defense as reasonably determined by the Trustee.  The
Company need not pay for any settlement made without its written consent.  The
Company need not reimburse any expense or in-

                                     -92-
<PAGE>

demnify against any loss or liability to the extent incurred by the Trustee
through its negligence, bad faith or willful misconduct.

          To secure the Company's payment obligations in this Section 7.07, the
Trustee shall have a senior claim prior to the Securities against all money or
property held or collected by the Trustee, in its capacity as Trustee.  The
obligations of the Company and the Guarantors under this Section shall not be
subordinated to the payment of Senior Debt pursuant to Article Ten or Article
Twelve except assets or money held in trust to pay principal of or interest on
particular Securities.

          When the Trustee incurs expenses or renders services after an Event of
Default specified in clause (f) or (g) of Section 6.01 occurs, such expenses and
the compensation for such services shall be paid to the extent allowed under any
Bankruptcy Law.

          Notwithstanding any other provision in this Indenture, the foregoing
provisions of this Section 7.07 shall survive the satisfaction and discharge of
the Indenture or the appointment of a successor Trustee.

SECTION 7.08.  Replacement of Trustee.
               ----------------------

          The Trustee may resign at any time by so notifying the Company in
writing.  The Holders of a majority in principal amount of the outstanding
Securities may remove the Trustee by so notifying the Company and the Trustee
and may appoint a successor Trustee.  The Company may remove the Trustee if:

          (1)  the Trustee fails to comply with Section 7.10;

          (2)  the Trustee is adjudged a bankrupt or an insolvent;

          (3)  a receiver or other public officer takes charge of the Trustee or
     its property; or

          (4)  the Trustee becomes incapable of acting.

                                     -93-
<PAGE>

          If the Trustee resigns or is removed or if a vacancy exists in the
office of Trustee for any reason, the Company shall notify each Holder of such
event and shall promptly appoint a successor Trustee.  Within one year after the
successor Trustee takes office, the Holders of a majority in principal amount of
the Securities may appoint a successor Trustee to replace the successor Trustee
appointed by the Company.

          A successor Trustee shall deliver a written acceptance of its
appointment to the retiring Trustee and to the Company.  Immediately after that,
the retiring Trustee shall transfer, after payment of all sums then owing to the
Trustee pursuant to Section 7.07, all property held by it as Trustee to the
successor Trustee, subject to the Lien provided in Section 7.07, 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 this
Indenture.  A successor Trustee shall mail notice of its succession to each
Securityholder.

          If a successor Trustee does not take office within 60 days after the
retiring Trustee resigns or is removed, the retiring Trustee, the Company or the
Holders of at least 10% in principal amount of the outstanding Securities may
petition any court of competent jurisdiction for the appointment of a successor
Trustee.

          If the Trustee fails to comply with Section 7.10, any Securityholder
may petition any court of competent jurisdiction for the removal of the Trustee
and the appointment of a successor Trustee.

          Notwithstanding replacement of the Trustee pursuant to this Section
7.08, the Company's obligations under Section 7.07 shall continue for the
benefit of the retiring Trustee.

SECTION 7.09.  Successor Trustee by Merger, Etc.
               --------------------------------

          If the Trustee consolidates with, merges or converts into, or
transfers all or substantially all of its corporate trust business to, another
corporation, the resulting, surviving or transferee corporation without any
further act shall, if

                                     -94-
<PAGE>

such resulting, surviving or transferee corporation is otherwise eligible
hereunder, be the successor Trustee; provided that such corporation shall be
                                     --------
otherwise qualified and eligible under this Article Seven.

SECTION 7.10.  Eligibility; Disqualification.
               -----------------------------

          This Indenture shall always have a Trustee who satisfies the
requirement of TIA (S)(S) 310(a)(1), 310(a)(2) and 310(a)(5).  The Trustee shall
have a combined capital and surplus of at least $50,000,000 as set forth in its
most recent published annual report of condition.  In addition, if the Trustee
is a corporation included in a bank holding company system, the Trustee,
independently of the bank holding company, shall meet the capital requirements
of TIA (S) 310(a)(2).  The Trustee shall comply with TIA (S) 310(b); provided,
                                                                     --------
however, that there shall be excluded from the operation of TIA (S) 310(b)(1)
-------
any indenture or indentures under which other securities, or certificates of
interest or participation in other securities, of the Company are outstanding,
if the requirements for such exclusion set forth in TIA (S) 310(b)(1) are met.
The provisions of TIA (S) 310 shall apply to the Company and any other obligor
of the Securities.

SECTION 7.11.  Preferential Collection of Claims Against Company.
               -------------------------------------------------

          The Trustee, in its capacity as Trustee hereunder shall comply with
TIA (S) 311(a), excluding any creditor relationship listed in TIA (S) 311(b).  A
Trustee who has resigned or been removed shall be subject to TIA (S) 311(a) to
the extent indicated.

                                 ARTICLE EIGHT

                       DISCHARGE OF INDENTURE; DEFEASANCE

SECTION 8.01.  Termination of the Company's Obligations.
               ----------------------------------------

          The Company may terminate its obligations under the Securities and
this Indenture, except those obligations re-

                                     -95-
<PAGE>

ferred to in the penultimate paragraph of this Section 8.01, if all Securities
previously authenticated and delivered (other than destroyed, lost or stolen
Securities which have been replaced or paid or Securities for whose payment U.S.
Legal Tender has theretofore been deposited with the Trustee or the Paying Agent
in trust or segregated and held in trust by the Company and thereafter repaid to
the Company, as provided in Section 8.05) have been delivered to the Trustee for
cancellation and the Company has paid all sums payable by it hereunder, or if:

          (a)  either (i) pursuant to Article Three, the Company shall have
     given notice to the Trustee and mailed a notice of redemption to each
     Holder of the redemption of all of the Securities in accordance with the
     provisions hereof or (ii) all Securities have otherwise become due and
     payable hereunder;

          (b)  the Company shall have irrevocably deposited or caused to be
     deposited with the Trustee or a trustee satisfactory to the Trustee, under
     the terms of an irrevocable trust agreement in form and substance
     satisfactory to the Trustee, as trust funds in trust solely for the benefit
     of the Holders of that purpose, U.S. Legal Tender in such amount as is
     sufficient without consideration of reinvestment of such interest, to pay
     principal of, premium, if any, and interest on the outstanding Securities
     to maturity or redemption; provided that the Trustee shall have been
                                --------
     irrevocably instructed to apply such U.S. Legal Tender to the payment of
     said principal, premium, if any, and interest with respect to the
     Securities and provided, further, that from and after the time of deposit,
                    --------  -------
     the money deposited shall not be subject to the rights of holders of Senior
     Debt or Guarantor Senior Debt pursuant to the provisions of Article Ten or
     Twelve, as the case may be;

          (c)  no Default or Event of Default with respect to this Indenture or
     the Securities shall have occurred and be continuing on the date of such
     deposit or shall occur as a result of such deposit and such deposit will
     not result in a breach or violation of, or constitute a default under, the
     Indenture, the Credit Agreement, any other ma-

                                     -96-
<PAGE>

     terial agreement or instrument to which the Company or any of its
     Subsidiaries is a party or by which it is bound;

          (d)  the Company shall have paid all other sums payable by it
     hereunder; and

          (e)  the Company shall have delivered to the Trustee an Officers'
     Certificate and an Opinion of Counsel, each stating that all conditions
     precedent providing for or relating to the termination of the Company's
     obligations under the Securities and this Indenture have been complied
     with.  Such Opinion of Counsel shall also state that such satisfaction and
     discharge does not result in a default under the Credit Agreement or any
     other material agreement or instrument then known to such counsel that
     binds or affects the Company.

          Subject to the next sentence and notwithstanding the foregoing
paragraph, the Company's obligations in Sections 2.05, 2.06, 2.07, 2.08, 4.01,
4.02, 7.07, 8.05 and 8.06 shall survive until the Securities are no longer
outstanding pursuant to the last paragraph of Section 2.08.  After the
Securities are no longer outstanding, the Company's obligations in Sections
7.07, 8.05 and 8.06 shall survive.

          After such delivery or irrevocable deposit, the Trustee upon request
shall acknowledge in writing the discharge of the Company's obligations under
the Securities and this Indenture except for those surviving obligations
specified above.

SECTION 8.02.  Legal Defeasance and Covenant Defeasance.
               ----------------------------------------

          (a)  The Company may, at its option by Board Resolution of the Board
of Directors of the Company, at any time, elect to have either paragraph (b) or
(c) below be applied to all outstanding Securities upon compliance with the
conditions set forth in Section 8.03.

          (b)  Upon the Company's exercise under paragraph (a) hereof of the
option applicable to this paragraph (b), the Company shall, subject to the
satisfaction of the conditions set forth in Section 8.03, be deemed to have been
discharged from its obligations with respect to all outstanding Securities on

                                     -97-
<PAGE>

the date the conditions set forth below are satisfied (hereinafter, "Legal
                                                                     -----
Defeasance").  For this purpose, Legal Defeasance means that the Company shall
----------
be deemed to have paid and discharged the entire Indebtedness represented by the
outstanding Securities, which shall thereafter be deemed to be "outstanding"
only for the purposes of Section 8.04 hereof and the other Sections of this
Indenture referred to in (i) and (ii) below, and to have satisfied all its other
obligations under such Securities and this Indenture (and the Trustee, on demand
of and at the expense of the Company, shall execute proper instruments
acknowledging the same), and Holders of the Securities and any amounts deposited
under Section 8.03 hereof shall cease to be subject to any obligations to, or
the rights of, any holder of Senior Debt under Article Ten or otherwise, except
for the following provisions, which shall survive until otherwise terminated or
discharged hereunder:  (i) the rights of Holders of outstanding Securities to
receive solely from the trust fund described in Section 8.04 hereof, and as more
fully set forth in such Section, payments in respect of the principal of
premium, if any, and interest on such Securities when such payments are due,
(ii) the Company's obligations with respect to such Securities under Article Two
and Section 4.02 hereof, (iii) the rights, powers, trusts, duties and immunities
of the Trustee hereunder and the Company's obligations in connection therewith
and (iv) this Article Eight.  Subject to compliance with this Article Eight, the
Company may exercise its option under this paragraph (b) notwithstanding the
prior exercise of its option under paragraph (c) hereof.

          (c)  Upon the Company's exercise under paragraph (a) hereof of the
option applicable to this paragraph (c), the Company shall, subject to the
satisfaction of the conditions set forth in Section 8.03 hereof, be released
from its obligations under the covenants contained in Sections 4.03, 4.04 and
Sections 4.12 through 4.19 and Article Five hereof with respect to the
outstanding Securities on and after the date the conditions set forth below are
satisfied (hereinafter, "Covenant Defeasance"), and the Securities shall
                         -------------------
thereafter be deemed not "outstanding" for the purposes of any direction,
waiver, consent or declaration or act of Holders (and the consequences of any
thereof) in connection with such covenants, but shall continue to be deemed
"outstanding" for all other purposes

                                     -98-
<PAGE>

hereunder (it being understood that such Securities shall not be deemed
outstanding for accounting purposes) and Holders of the Securities and any
amounts deposited under Section 8.03 hereof shall cease to be subject to any
obligations to, or the rights of, any holder of Senior Debt under Article Ten or
otherwise. For this purpose, such Covenant Defeasance means that, with respect
to the outstanding Securities, the Company may omit to comply with and shall
have no liability in respect of any term, condition or limitation set forth in
any such covenant, whether directly or indirectly, by reason of any reference
elsewhere herein to any such covenant or by reason of any reference in any such
covenant to any other provision herein or in any other document and such
omission to comply shall not constitute a Default or an Event of Default under
Section 6.01(c) hereof, but, except as specified above, the remainder of this
Indenture and such Securities shall be unaffected thereby. In addition, upon the
Company's exercise under paragraph (a) hereof of the option applicable to this
paragraph (c), subject to the satisfaction of the conditions set forth in
Section 8.03 hereof, Sections 6.01(c), 6.01(d) and 6.01(e) shall not constitute
Events of Default.

SECTION 8.03.  Conditions to Legal Defeasance or Covenant Defeasance.
               -----------------------------------------------------

          The following shall be the conditions to the application of either
Section 8.02(b) or 8.02(c) hereof to the outstanding Securities:

     In order to exercise either Legal Defeasance or Covenant Defeasance:

          (a)  the Company must irrevocably deposit with the Trustee, in trust,
     for the benefit of the Holders, U.S. Legal Tender or U.S. Government
     Obligations or a combination thereof which through the scheduled payment of
     principal and interest in respect thereof in accordance with their terms,
     will provide, not later than one day before the due date of any payment on
     the Securities, U.S. Legal Tender in such amounts as will be sufficient, in
     the opinion of a nationally recognized firm of independent public
     accountants, to pay the principal of, premium, if any, and

                                     -99-
<PAGE>

     interest on the Securities on the stated date for payment thereof or on the
     applicable redemption date, as the case may be;

          (b)  in the case of an election under Section 8.02(b) hereof, the
     Company shall have delivered to the Trustee an Opinion of Counsel in the
     United States reasonably acceptable to the Trustee confirming that (A) the
     Company has received from, or there has been published by, the Internal
     Revenue Service a ruling or (B) since the date of this Indenture, there has
     been a change in the applicable federal income tax law, in either case to
     the effect that, and based thereon such Opinion of Counsel shall confirm
     that, the Holders will not recognize income, gain or loss for federal
     income tax purposes as a result of such Legal Defeasance and will be
     subject to federal income tax on the same amounts, in the same manner and
     at the same times as would have been the case if such Legal Defeasance had
     not occurred;

          (c)  in the case of an election under Section 8.02(c) hereof, the
     Company shall have delivered to the Trustee an Opinion of Counsel in the
     United States reasonably acceptable to the Trustee confirming that the
     Holders of the Securities will not recognize income, gain or loss for
     federal income tax purposes as a result of such Covenant Defeasance and
     will be subject to federal income tax on the same amounts, in the same
     manner and at the same times as would have been the case if such Covenant
     Defeasance had not occurred;

          (d)  no Default or Event of Default shall have occurred and be
     continuing on the date of such deposit (other than a Default or Event of
     Default resulting from the incurrence of Indebtedness all or a portion of
     the proceeds of which will be used to defease the Securities pursuant to
     this Article Eight concurrently with such incurrence) or insofar as
     Sections 6.01(f) and 6.01(g) hereof are concerned, at any time in the
     period ending on the 91st day after the date of such deposit;

                                     -100-
<PAGE>

          (e)  such Legal Defeasance or Covenant Defeasance shall not result in
     a breach or violation of, or constitute a default under this Indenture, the
     Credit Agreement or any other material agreement or instrument to which the
     Company or any of its Subsidiaries is a party or by which the Company or
     any of its Subsidiaries is bound;

          (f)  the Company shall have delivered to the Trustee an Officers'
     Certificate stating that the deposit was not made by the Company with the
     intent of preferring the Holders over any other creditors of the Company or
     with the intent of defeating, hindering, delaying or defrauding any other
     creditors of the Company or others;

          (g)  the Company shall have delivered to the Trustee an Officers'
     Certificate and an Opinion of Counsel, each stating that all conditions
     precedent provided for or relating to the Legal Defeasance or the Covenant
     Defeasance have been complied with; and

          (h)  the Company shall have delivered to the Trustee an Opinion of
     Counsel to the effect that (i) the trust funds will not be subject to any
     rights of any holders of Senior Debt, including, without limitation, those
     arising under this Indenture, and (ii) assuming no intervening bankruptcy
     or insolvency of the Company between the date of deposit and the 91st day
     following the deposit and that no Holder is an insider of the Company,
     after the 91st day following the deposit, the trust funds will not be
     subject to the effect of any applicable Bankruptcy Law.

          Notwithstanding the foregoing, the Opinion of Counsel required by
clause (b) above of this Section 8.03 with respect to a Legal Defeasance need
not be delivered if all Securities not theretofore delivered to the Trustee for
cancellation (i) have become due and payable or (ii) will become due and payable
on the Maturity Date within one year under arrangements satisfactory to the
Trustee for the giving of notice of redemption by the Trustee in the name, and
at the expense, of the Company.

                                     -101-
<PAGE>

SECTION 8.04.  Application of Trust Money.
               --------------------------

          The Trustee or Paying Agent shall hold in trust U.S. Legal Tender or
U.S. Government Obligations deposited with it pursuant to this Article Eight,
and shall apply the deposited U.S. Legal Tender and the money from U.S.
Government Obligations in accordance with this Indenture to the payment of
principal of and interest on the Securities.  The Trustee shall be under no
obligation to invest said U.S. Legal Tender or U.S. Government Obligations
except as it may agree with the Company.

          The Company shall pay and indemnify the Trustee against any tax, fee
or other charge imposed on or assessed against the U.S. Legal Tender or U.S.
Government Obligations deposited pursuant to Section 8.03 hereof or the
principal and interest received in respect thereof other than any such tax, fee
or other charge which by law is for the account of the Holders of the
outstanding Securities.

          Anything in this Article Eight to the contrary notwithstanding, the
Trustee shall deliver or pay to the Company from time to time upon the Company's
request any U.S. Legal Tender or U.S. Government Obligations held by it as
provided in Section 8.03 hereof which, in the opinion of a nationally recognized
firm of independent public accountants expressed in a written certification
thereof delivered to the Trustee, are in excess of the amount thereof that would
then be required to be deposited to effect an equivalent Legal Defeasance or
Covenant Defeasance.

SECTION 8.05.  Repayment to the Company.
               ------------------------

          Subject to this Article Eight, the Trustee and the Paying Agent shall
promptly pay to the Company upon request any excess U.S. Legal Tender or U.S.
Government Obligations held by them at any time and thereupon shall be relieved
from all liability with respect to such money.  The Trustee and the Paying Agent
shall pay to the Company upon request any money held by them for the payment of
principal or interest that remains unclaimed for two years; provided that the
                                                            --------
Trustee or such Paying Agent, before being required to make any payment, may at
the expense of the Company cause to be published once in a newspa-

                                     -102-
<PAGE>

per of general circulation in the City of New York or mail to each Holder
entitled to such money notice that such money remains unclaimed and that after a
date specified therein which shall be at least 30 days from the date of such
publication or mailing any unclaimed balance of such money then remaining will
be repaid to the Company. After payment to the Company, Holders entitled to such
money must look to the Company for payment as general creditors unless an
applicable law designates another Person.

SECTION 8.06.  Reinstatement.
               -------------

          If the Trustee or Paying Agent is unable to apply any U.S. Legal
Tender or U.S. Government Obligations in accordance with this Article Eight by
reason of any legal proceeding or by reason of any order or judgment of any
court or governmental authority enjoining, restraining or otherwise prohibiting
such application, the Company's obligations under this Indenture and the
Securities shall be revived and reinstated as though no deposit had occurred
pursuant to this Article Eight until such time as the Trustee or Paying Agent is
permitted to apply all such U.S. Legal Tender or U.S. Government Obligations in
accordance with this Article Eight; provided that if the Company has made any
                                    --------
payment of interest on or principal of any Securities because of the
reinstatement of its obligations, the Company shall be subrogated to the rights
of the Holders of such Securities to receive such payment from the U.S. Legal
Tender or U.S. Government Obligations held by the Trustee or Paying Agent.

                                 ARTICLE NINE

                      AMENDMENTS, SUPPLEMENTS AND WAIVERS

SECTION 9.01.  Without Consent of Holders.
               --------------------------

          Subject to Section 9.03, the Company, the Guarantors and the Trustee,
together, may amend or supplement this Indenture, the Securities or the
Guarantees without notice to or consent of any Securityholder:

                                     -103-
<PAGE>

          (1)  to cure any ambiguity, defect or inconsistency;

          (2)  to evidence the succession in accordance with Article Five
     hereof of another Person to the Company and the assumption by any such
     successor of the covenants of the Company herein and in the Securities;

          (3)  to provide for uncertificated Securities in addition to or in
     place of certificated Securities;

          (4)  to make any other change that does not adversely affect the
     rights of any Securityholders hereunder in any material respect;

          (5)  to comply with any requirements of the Commission in connection
     with the qualification of this Indenture under the TIA; or

          (6)  to add or release any Guarantor pursuant to the terms of this
     Indenture;

provided that the Company has delivered to the Trustee an Opinion of Counsel and
--------
an Officers' Certificate, each stating that such amendment or supplement
complies with the provisions of this Section 9.01.

SECTION 9.02.  With Consent of Holders.
               -----------------------

          Subject to Sections 6.07 and 9.03, the Company, the Guarantors and the
Trustee, together, with the written consent of the Holder or Holders of at least
a majority in aggregate principal amount of the outstanding Securities, may
amend or supplement this Indenture, the Securities or the Guarantees, without
notice to any other Securityholders. Subject to Sections 6.07 and 9.03, the
Holder or Holders of a majority in aggregate principal amount of the outstanding
Securities may waive compliance by the Company with any provision of this
Indenture, the Securities or the Guarantees without notice to any other
Securityholder. Without the consent of each Securityholder affected, however, no
amendment, supplement or waiver, including a waiver pursuant to Section 6.04,
may:

                                     -104-
<PAGE>

          (1)  reduce the amount of Securities whose Holders must consent to
     an amendment, supplement or waiver;

          (2)  reduce the rate of or change or have the effect of changing the
     time for payment of interest, including default interest, on any
     Securities;

          (3)  reduce the principal of or change or have the effect of changing
     the fixed maturity of any Securities, or change the date on which any
     Securities may be subject to redemption or repurchase, or reduce the
     redemption or purchase price therefor;

          (4)  make any Securities payable in money other than that stated in
     the Securities;

          (5)  make any change in provisions of this Indenture protecting the
     right of each Holder to receive payment of principal of and interest on
     such Security on or after the due date thereof or to bring suit to enforce
     such payment, or permitting Holders of a majority in principal amount of
     the Securities to waive Defaults or Events of Default;

          (6)  modify or change any provision of this Indenture or the related
     definitions affecting the subordination or ranking of the Securities or any
     Guarantee, in a manner which adversely affects the Holders;

          (7)  after the Company's obligation to purchase Securities arises
     thereunder, amend, modify or change in any material respect the obligation
     of the Company to make and consummate a Change of Control Offer in the
     event of a Change of Control or make and consummate a Net Proceeds Offer
     with respect to any Asset Sale that has been consummated, or modify any of
     the provisions or definitions with respect thereto; or

          (8)  release any Guarantor that is a Significant Subsidiary from any
     of its obligations under its Guarantee or this Indenture otherwise than in
     accordance with the terms of this Indenture.

                                     -105-
<PAGE>

          It shall not be necessary for the consent of the Holders under this
Section to approve the particular form of any proposed amendment, supplement or
waiver, but it shall be sufficient if such consent approves the substance
thereof.

          After an amendment, supplement or waiver under this Section 9.02
becomes effective, the Company shall mail to the Holders affected thereby a
notice briefly describing the amendment, supplement or waiver.  Any failure of
the Company to mail such notice, or any defect therein, shall not, however, in
any way impair or affect the validity of any such supplemental indenture.

SECTION 9.03.  Effect on Senior Debt.
               ---------------------

          No amendment of, or supplement or waiver to, this Indenture shall
adversely affect the rights of any holder of Senior Debt or Guarantor Senior
Debt under Article Ten or Article Twelve, as the case may be, of this Indenture,
without the consent of such holder.

SECTION 9.04.  Compliance with TIA.
               -------------------

          From the date on which this Indenture is qualified under the TIA,
every amendment, waiver or supplement of this Indenture, the Securities or the
Guarantees shall comply with the TIA as then in effect.

SECTION 9.05.  Revocation and Effect of Consents.
               ---------------------------------

          Until an amendment, waiver or supplement becomes effective, a consent
to it by a Holder is a continuing consent by the Holder and every subsequent
Holder of a Security or portion of a Security that evidences the same debt as
the consenting Holder's Security, even if notation of the consent is not made on
any Security.  However, any such Holder or subsequent Holder may revoke the
consent as to his Security or portion of his Security by notice to the Trustee
or the Company received before the date on which the Trustee receives an
Officers' Certificate certifying that the Holders of the requisite principal
amount of Securities have consented (and not theretofore revoked such consent)
to the amendment, supplement or waiver.

                                     -106-
<PAGE>

          The Company may, but shall not be obligated to, fix a record date for
the purpose of determining the Holders entitled to consent to any amendment,
supplement or waiver which record date shall be at least 30 days prior to the
first solicitation of such consent.  If a record date is fixed, then
notwithstanding the last sentence of the immediately preceding paragraph, those
Persons who were Holders at such record date (or their duly designated proxies),
and only those Persons, shall be entitled to revoke any consent previously
given, whether or not such Persons continue to be Holders after such record
date.  No such consent shall be valid or effective for more than 90 days after
such record date.

          After an amendment, supplement or waiver becomes effective, it shall
bind every Securityholder, unless it makes a change described in any of clauses
(1) through (9) of Section 9.02, in which case, the amendment, supplement or
waiver shall bind only each Holder of a Security who has consented to it and
every subsequent Holder of a Security or portion of a Security that evidences
the same debt as the consenting Holder's Security; provided that any such waiver
                                                   --------
shall not impair or affect the right of any Holder to receive payment of
principal of and interest on a Security, on or after the respective due dates
expressed in such Security, or to bring suit for the enforcement of any such
payment on or after such respective dates without the consent of such Holder.

SECTION 9.06.  Notation on or Exchange of Securities.
               -------------------------------------

          If an amendment, supplement or waiver changes the terms of a Security,
the Company may require the Holder of the Security to deliver it to the Trustee.
The Company shall provide the Trustee with an appropriate notation on the
Security about the changed terms and cause the Trustee to return it to the
Holder at the Company's expense.  Alternatively, if the Company or the Trustee
so determines, the Company in exchange for the Security shall issue and the
Trustee shall authenticate a new Security that reflects the changed terms.
Failure to make the appropriate notation or issue a new Security shall not
affect the validity and effect of such amendment, supplement or waiver.

                                     -107-
<PAGE>

SECTION 9.07.  Trustee To Sign Amendments, Etc.
               -------------------------------

          The Trustee shall execute any amendment, supplement or waiver
authorized pursuant to this Article Nine; provided that the Trustee may, but
                                          --------
shall not be obligated to, execute any such amendment, supplement or waiver
which affects the Trustee's own rights, duties or immunities under this
Indenture.  The Trustee shall be entitled to receive, and shall be fully
protected in relying upon, an Opinion of Counsel and an Officers' Certificate
each stating that the execution of any amendment, supplement or waiver
authorized pursuant to this Article Nine is authorized or permitted by this
Indenture and constituted the legal, valid and binding obligations of the
Company enforceable in accordance with its terms.  Such Opinion of Counsel shall
be at the expense of the Company.

                                  ARTICLE TEN

                          SUBORDINATION OF SECURITIES

SECTION 10.01. Securities Subordinated to Senior Debt.
               --------------------------------------

          Anything herein to the contrary notwithstanding, the Company, for
itself and its successors, and each Holder, by his or her acceptance of
Securities, agrees that the payment of all Obligations owing to the Holders in
respect of the Securities is subordinated, to the extent and in the manner
provided in this Article Ten, to the prior payment in full in cash or Cash
Equivalents, or such payment duly provided for to the satisfaction of the
holders of Senior Debt, of all Obligations on Senior Debt (including the
Obligations with respect to the Credit Agreement).  Notwithstanding the
foregoing, payments and distributions made relating to the Notes pursuant to the
trust described under Article Eight shall not, so long as the conditions
specified in Article Eight (without any waiver or modification of the
requirement that the deposits pursuant thereto do not conflict with the terms of
the Credit Agreement or any other Senior Debt or Guarantor Senior Debt) are
satisfied on

                                     -108-
<PAGE>

the date of any deposit pursuant to said trust, be so subordinated in right of
payment.

          This Article Ten shall constitute a continuing offer to all Persons
who become holders of, or continue to hold, Senior Debt, and such provisions are
made for the benefit of the holders of Senior Debt and such holders are made
obligees hereunder and any one or more of them may enforce such provisions.

SECTION 10.02. Suspension of Payment When Senior Debt Is in Default.
               ----------------------------------------------------

          (a)  If any default occurs and is continuing in the payment when due,
whether at maturity, upon any redemption, by declaration or otherwise, of any
principal of, interest on, unpaid drawings for letters of credit issued in
respect of, or regularly accruing fees with respect to, any Senior Debt (a
"Payment Default"), then no payment or distribution of any kind or character
----------------
shall be made by or on behalf of the Company or any other Person on its or their
behalf with respect to any Obligations on or relating to the Securities or to
acquire any of the Securities for cash or property or otherwise.

          (b)  If any other event of default (other than a Payment Default)
occurs and is continuing with respect to any Designated Senior Debt (as such
event of default is defined in the instrument creating or evidencing such
Designated Senior Debt) permitting the holders of such Designated Senior Debt
then outstanding to accelerate the maturity thereof (a "Non-payment Default")
                                                        -------------------
and if the Representative for the respective issue of Designated Senior Debt
gives notice of the event of default to the Trustee stating that such notice is
a payment blockage notice (a "Payment Blockage Notice"), then, unless and until
                              -----------------------
all events of default have been cured or waived or have ceased to exist or the
Trustee receives notice thereof from the Representative for the respective issue
of Designated Senior Debt terminating the Payment Blockage Period (as defined
below), during the 180 days after the delivery of such Payment Blockage Notice
(the "Payment Blockage Period"), neither the Company nor any other Person on its
      -----------------------
behalf shall (x) make any payment of any kind or character with respect to any
Obligations on or with

                                     -109-
<PAGE>

respect to the Securities or (y) acquire any of the Securities for cash or
property or otherwise. Notwithstanding anything herein to the contrary, (x) in
no event will a Payment Blockage Period extend beyond 180 days from the date the
applicable Payment Blockage Notice is received by the Trustee and (y) only one
such Payment Blockage Period may be commenced within any 360 consecutive days.
For all purposes of this Section 10.02(b), no event of default which existed or
was continuing on the date of the commencement of any Payment Blockage Period
with respect to the Designated Senior Debt shall be, or be made, the basis for
the commencement of a second Payment Blockage Period by the Representative of
such Designated Senior Debt whether or not within a period of 360 consecutive
days, unless such event of default shall have been cured or waived for a period
of not less than 90 consecutive days (it being acknowledged that any subsequent
action, or any breach of any financial covenants for a period commencing after
the date of commencement of such Payment Blockage Period that, in either case,
would give rise to an event of default pursuant to any provisions under which an
event of default previously existed or was continuing shall constitute a new
event of default for this purpose).

          (c)  In the event that, notwithstanding the foregoing, any payment
shall be received by the Trustee or any Holder when such payment is prohibited
by the foregoing provisions of this Section 10.02, such payment shall be held in
trust for the benefit of, and shall be paid over or delivered to, the holders of
Senior Debt (pro rata to such holders on the basis of the respective amount of
Senior Debt held by such holders) or their respective Representatives, as their
respective interests may appear. The Trustee shall be entitled to rely on
information regarding amounts then due and owing on the Senior Debt, if any,
received from the holders of Senior Debt (or their Representatives) or, if such
information is not received from such holders or their Representatives, from the
Company and only amounts included in the information provided to the Trustee
shall be paid to the holders of Senior Debt.

          Nothing contained in this Article Ten shall limit the right of the
Trustee or the Holders of Securities to take any action to accelerate the
maturity of the Securities pursuant to

                                     -110-
<PAGE>

Section 6.02 or to pursue any rights or remedies hereunder; provided that all
                                                            --------
Senior Debt thereafter due or declared to be due shall first be paid in full in
cash or Cash Equivalents before the Holders are entitled to receive any payment
of any kind or character with respect to Obligations on the Securities.

SECTION 10.03. Securities Subordinated to Prior Payment of All Senior Debt on
               Dissolution, Liquidation or Reorganization of Company.
               -----------------------------------------------------

          (a)  Upon any payment or distribution of assets of the Company of any
kind or character, whether in cash, property or securities, to creditors upon
any total or partial liquidation, dissolution, winding-up, reorganization,
assignment for the benefit of creditors or marshaling of assets of the Company
or in a bankruptcy, reorganization, insolvency, receivership or other similar
proceeding relating to the Company or its property, whether voluntary or
involuntary, all Obligations due or to become due upon all Senior Debt shall
first be paid in full in cash or Cash Equivalents, or such payment duly provided
for to the satisfaction of the holders of Senior Debt, before any payment or
distribution of any kind or character is made on account of any Obligations on
or relating to the Securities, or for the acquisition of any of the Securities
for cash or property or otherwise. Upon any such dissolution, winding-up,
liquidation, reorganization, receivership or similar proceeding, any payment or
distribution of assets of the Company of any kind or character, whether in cash,
property or securities, to which the Holders of the Securities or the Trustee
under this Indenture would be entitled, except for the provisions hereof, shall
be paid by the Company or by any receiver, trustee in bankruptcy, liquidating
trustee, agent or other Person making such payment or distribution, or by the
Holders or by the Trustee under this Indenture if received by them, directly to
the holders of Senior Debt (pro rata to such holders on the basis of the
respective amounts of Senior Debt held by such holders) or their respective
Representatives, or to the trustee or trustees under any indenture pursuant to
which any of such Senior Debt may have been issued, as their respective
interests may appear, for application to the payment of Senior Debt remaining
unpaid until all such Senior Debt has been paid in full in cash

                                     -111-
<PAGE>

or Cash Equivalents after giving effect to any concurrent payment, distribution
or provision therefor to or for the holders of Senior Debt.

          (b)  To the extent any payment of Senior Debt (whether by or on behalf
of the Company, as proceeds of security or enforcement of any right of setoff or
otherwise) is declared to be fraudulent or preferential, set aside or required
to be paid to any receiver, trustee in bankruptcy, liquidating trustee, agent or
other similar Person under any bankruptcy, insolvency, receivership, fraudulent
conveyance or similar law, then, if such payment is recovered by, or paid over
to, such receiver, trustee in bankruptcy, liquidating trustee, agent or other
similar Person, the Senior Debt or part thereof originally intended to be
satisfied shall be deemed to be reinstated and outstanding as if such payment
had not occurred.

          (c)  In the event that, notwithstanding the foregoing, any payment or
distribution of assets of the Company of any kind or character, whether in cash,
property or securities, shall be received by any Holder when such payment or
distribution is prohibited by this Section 10.03, such payment or distribution
shall be held in trust for the benefit of, and shall be paid over or delivered
to, the holders of Senior Debt (pro rata to such holders on the basis of the
respective amount of Senior Debt held by such holders) or their respective
Representatives, or to the trustee or trustees under any indenture pursuant to
which any of such Senior Debt may have been issued, as their respective
interests may appear, for application to the payment of Senior Debt remaining
unpaid until all such Senior Debt has been paid in full in cash or Cash
Equivalents, after giving effect to any concurrent payment, distribution or
provision therefor to or for the holders of such Senior Debt.

          (d)  The consolidation of the Company with, or the merger of the
Company with or into, another corporation, partnership, trust or limited
liability company or the liquidation or dissolution of the Company following the
conveyance or transfer of all or substantially all of its assets, to another
corporation, partnership, trust or limited liability company upon the terms and
conditions provided in Article Five hereof and as long as permitted under the
terms of the Senior Debt

                                     -112-
<PAGE>

shall not be deemed a dissolution, winding-up, liquidation or reorganization for
the purposes of this Section if such other corporation shall, as a part of such
consolidation, merger, conveyance or transfer, assume the Company's obligations
hereunder in accordance with Article Five hereof.

SECTION 10.04. Payments May Be Paid Prior to Dissolution.
               -----------------------------------------

          Nothing contained in this Article Ten or elsewhere in this Indenture
shall prevent (i) the Company, except under the conditions described in Sections
10.02 and 10.03, from making payments at any time for the purpose of making
payments of principal of and interest on the Securities, or from depositing with
the Trustee any moneys for such payments, or (ii) in the absence of actual
knowledge by the Trustee that a given payment would be prohibited by Section
10.02 or 10.03, the application by the Trustee of any moneys deposited with it
for the purpose of making such payments of principal of, and interest on, the
Securities to the Holders entitled thereto unless at least two Business Days
prior to the date upon which such payment would otherwise become due and payable
a Trust Officer shall have actually received the written notice provided for in
the first sentence of Section 10.02(b) or in Section 10.07 (provided that,
                                                            ---------
notwithstanding the foregoing, the Holders receiving any payments made in
contravention of Section 10.02 and/or 10.03 (and the respective such payments)
shall otherwise be subject to the provisions of Section 10.02 and Section
10.03).  The Company shall give prompt written notice to the Trustee of any
dissolution, winding-up, liquidation or reorganization of the Company, although
any delay or failure to give any such notice shall have no effect on the
subordination provisions contained herein.

SECTION 10.05. Holders To Be Subrogated to Rights of Holders of Senior Debt.
               ------------------------------------------------------------

          Subject to the payment in full in cash or Cash Equivalents of all
Senior Debt, the Holders of the Securities shall be subrogated to the rights of
the holders of Senior Debt to receive payments or distributions of cash,
property or securities of the Company applicable to the Senior Debt until the

                                     -113-
<PAGE>

Securities shall be paid in full; and, for the purposes of such subrogation, no
such payments or distributions to the holders of the Senior Debt by or on behalf
of the Company, or by or on behalf of the Holders by virtue of this Article Ten,
which otherwise would have been made to the Holders shall, as between the
Company and the Holders, be deemed to be a payment by the Company to or on
account of the Senior Debt, it being understood that the provisions of this
Article Ten are and are intended solely for the purpose of defining the relative
rights of the Holders, on the one hand, and the holders of Senior Debt, on the
other hand.

SECTION 10.06. Obligations of the Company Unconditional.
               ----------------------------------------

          Nothing contained in this Article Ten or elsewhere in this Indenture
or in the Securities is intended to or shall impair, as among the Company, its
creditors other than the holders of Senior Debt, and the Holders, the obligation
of the Company, which is absolute and unconditional, to pay to the Holders the
principal of and any interest on the Securities as and when the same shall
become due and payable in accordance with their terms, or is intended to or
shall affect the relative rights of the Holders and creditors of the Company
other than the holders of the Senior Debt, nor shall anything herein or therein
prevent the Holder of any Security or the Trustee on its behalf from exercising
all remedies otherwise permitted by applicable law upon default under this
Indenture, subject to the rights, if any, in respect of cash, property or
securities of the Company received upon the exercise of any such remedy.

SECTION 10.07. Notice to Trustee.
               -----------------

          The Company shall give prompt written notice to the Trustee of any
fact known to the Company which would prohibit the making of any payment to or
by the Trustee in respect of the Securities pursuant to the provisions of this
Article Ten, although any delay or failure to give any such notice shall have no
effect on the subordination provisions contained herein.  Regardless of anything
to the contrary contained in this Article Ten or elsewhere in this Indenture,
the Trustee shall not be charged with knowledge of the existence of any default
or event of default with respect to any Senior Debt or of

                                     -114-
<PAGE>

any other facts which would prohibit the making of any payment to or by the
Trustee unless and until the Trustee shall have received notice in writing from
the Company, or from a holder of Senior Debt or a Representative therefor and,
prior to the receipt of any such written notice, the Trustee shall be entitled
to assume (in the absence of actual knowledge to the contrary) that no such
facts exist. The Trustee shall be entitled to rely on the delivery to it of any
notice pursuant to this Section 10.07 to establish that such notice has been
given by a holder of Senior Debt (or a trustee thereof).

          In the event that the Trustee determines in good faith that any
evidence is required with respect to the right of any Person as a holder of
Senior Debt to participate in any payment or distribution pursuant to this
Article Ten, the Trustee may request such Person to furnish evidence to the
reasonable satisfaction of the Trustee as to the amounts of Senior Debt held by
such Person, the extent to which such Person is entitled to participate in such
payment or distribution and any other facts pertinent to the rights of such
Person under this Article Ten, and if such evidence is not furnished the Trustee
may defer any payment to such Person pending judicial determination as to the
right of such Person to receive such payment.

SECTION 10.08. Reliance on Judicial Order or Certificate of Liquidating Agent.
               --------------------------------------------------------------

          Upon any payment or distribution of assets of the Company referred to
in this Article Ten, the Trustee, subject to the provisions of Article Seven
hereof, and the Holders of the Securities shall be entitled to rely upon any
order or decree made by any court of competent jurisdiction in which any
insolvency, bankruptcy, receivership, dissolution, winding-up, liquidation,
reorganization or similar case or proceeding is pending, or upon a certificate
of the receiver, trustee in bankruptcy, liquidating trustee, assignee for the
benefit of creditors, agent or other person making such payment or distribution,
delivered to the Trustee or the Holders of the Securities, for the purpose of
ascertaining the persons entitled to participate in such payment or
distribution, the holders of the Senior Debt and other Indebtedness of the
Company, the amount thereof or payable thereon, the amount or amounts paid or
dis-

                                     -115-
<PAGE>

tributed thereon and all other facts pertinent thereto or to this Article Ten.

SECTION 10.09. Trustee's Relation to Senior Debt.
               ---------------------------------

          The Trustee and any agent of the Company or the Trustee shall be
entitled to all the rights set forth in this Article Ten with respect to any
Senior Debt which may at any time be held by it in its individual or any other
capacity to the same extent as any other holder of Senior Debt and nothing in
this Indenture shall deprive the Trustee or any such agent of any of its rights
as such holder.

          With respect to the holders of Senior Debt, the Trustee undertakes to
perform or to observe only such of its covenants and obligations as are
specifically set forth in this Article Ten, and no implied covenants or
obligations with respect to the holders of Senior Debt shall be read into this
Indenture against the Trustee.  The Trustee shall not be deemed to owe any
fiduciary duty to the holders of Senior Debt.

          Whenever a distribution is to be made or a notice given to holders or
owners of Senior Debt, the distribution may be made and the notice may be given
to their Representative, if any.

SECTION 10.10. Subordination Rights Not Impaired by Acts or Omissions of the
               Company or Holders of Senior Debt.
               ---------------------------------

          No right of any present or future holders of any Senior Debt to
enforce subordination as provided herein shall at any time in any way be
prejudiced or impaired by any act or failure to act on the part of the Company
or by any act or failure to act, in good faith, by any such holder, or by any
noncompliance by the Company with the terms of this Indenture, regardless of any
knowledge thereof which any such holder may have or otherwise be charged with.

          Without in any way limiting the generality of the foregoing paragraph,
the holders of Senior Debt may, at any time and from time to time, without the
consent of or notice to the Trustee, without incurring responsibility to the
Trustee or

                                     -116-
<PAGE>

the Holders of the Securities and without impairing or releasing the
subordination provided in this Article Ten or the obligations hereunder of the
Holders of the Securities to the holders of the Senior Debt, do any one or more
of the following: (i) change the manner, place or terms of payment or extend the
time of payment of, or renew or alter, Senior Debt, or otherwise amend or
supplement in any manner Senior Debt, or any instrument evidencing the same or
any agreement under which Senior Debt is outstanding; (ii) sell, exchange,
release or otherwise deal with any property pledged, mortgaged or otherwise
securing Senior Debt; (iii) release any Person liable in any manner for the
payment or collection of Senior Debt; and (iv) exercise or refrain from
exercising any rights against the Company and any other Person.

SECTION 10.11. Securityholders Authorize Trustee To Effectuate Subordination of
               Securities.
               -----------

          Each Holder of Securities by its acceptance of them authorizes and
expressly directs the Trustee on its behalf to take such action as may be
necessary or appropriate to effectuate, as between the holders of Senior Debt
and the Holders of Securities, the subordination provided in this Article Ten,
and appoints the Trustee its attorney-in-fact for such purposes, including, in
the event of any dissolution, winding-up, liquidation or reorganization of the
Company (whether in bankruptcy, insolvency, receivership, reorganization or
similar proceedings or upon an assignment for the benefit of credits or
otherwise) tending towards liquidation of the business and assets of the
Company, the filing of a claim for the unpaid balance of its Securities and
accrued interest in the form required in those proceedings.

          If the Trustee does not file a proper claim or proof of debt in the
form required in such proceeding prior to 30 days before the expiration of the
time to file such claim or claims, then the holders of the Senior Debt or their
Representative are or is hereby authorized to have the right to file and are or
is hereby authorized to file an appropriate claim for and on behalf of the
Holders of said Securities.  Nothing herein contained shall be deemed to
authorize the Trustee or the holders of Senior Debt or their Representative to
authorize

                                     -117-
<PAGE>

or consent to or accept or adopt on behalf of any Holder any plan of
reorganization, arrangement, adjustment or composition affecting the Securities
or the rights of any Holder thereof, or to authorize the Trustee or the holders
of Senior Debt or their Representative to vote in respect of the claim of any
Holder in any such proceeding.

SECTION 10.12. This Article Ten Not To Prevent Events of Default.
               -------------------------------------------------

          The failure to make a payment on account of principal of or interest
on the Securities by reason of any provision of this Article Ten will not be
construed as preventing the occurrence of an Event of Default.

SECTION 10.13. Trustee's Compensation Not Prejudiced.
               -------------------------------------

          Nothing in this Article Ten will apply to amounts due to the Trustee
pursuant to other sections of this Indenture.

                                ARTICLE ELEVEN

                            GUARANTEE OF SECURITIES

SECTION 11.01. Unconditional Guarantee.
               -----------------------

          Subject to the provisions of this Article Eleven, each of the
Guarantors hereby, jointly and severally, unconditionally and irrevocably
guarantees, on a senior subordinated basis (such guarantees to be referred to
herein as a "Guarantee") to each Holder of a Security authenticated and
             ---------
delivered by the Trustee and to the Trustee and its successors and assigns,
irrespective of the validity and enforceability of this Indenture, the
Securities or the obligations of the Company or any other Guarantors to the
Holders or the Trustee hereunder or thereunder, that:  (a) the principal of,
premium, if any, and interest on the Securities shall be duly and punctually
paid in full when due, whether at maturity, upon redemption at the option of
Holders pursuant to the provisions of the Securities relating thereto, by
acceleration or otherwise, and interest on

                                     -118-
<PAGE>

the overdue principal and (to the extent permitted by law) interest, if any, on
the Securities and all other obligations of the Company or the Guarantors to the
Holders or the Trustee hereunder or thereunder (including amounts due the
Trustee under Section 7.07 hereof) and all other obligations shall be promptly
paid in full or performed, all in accordance with the terms hereof and thereof;
and (b) in case of any extension of time of payment or renewal of any Securities
or any of such other obligations, the same shall be promptly paid in full when
due or performed in accordance with the terms of the extension or renewal,
whether at maturity, by acceleration or otherwise. Failing payment when due of
any amount so guaranteed, or failing performance of any other obligation of the
Company to the Holders under this Indenture or under the Securities, for
whatever reason, each Guarantor shall be obligated to pay, or to perform or
cause the performance of, the same immediately. An Event of Default under this
Indenture or the Securities shall constitute an event of default under this
Guarantee, and shall entitle the Holders of Securities to accelerate the
obligations of the Guarantors hereunder in the same manner and to the same
extent as the obligations of the Company.

          Each of the Guarantors hereby agrees that its obligations hereunder
shall be unconditional, irrespective of the validity, regularity or
enforceability of the Securities or this Indenture, the absence of any action to
enforce the same, any waiver or consent by any Holder of the Securities with
respect to any provisions hereof or thereof, any release of any other Guarantor,
the recovery of any judgment against the Company, any action to enforce the
same, whether or not a Guarantee is affixed to any particular Security, or any
other circumstance which might otherwise constitute a legal or equitable
discharge or defense of a Guarantor. Each of the Guarantors hereby waives the
benefit of diligence, presentment, demand of payment, filing of claims with a
court in the event of insolvency or bankruptcy of the Company, any right to
require a proceeding first against the Company, protest, notice and all demands
whatsoever and covenants that its Guarantee shall not be discharged except by
complete performance of the obligations contained in the Securities, this
Indenture and this Guarantee. This Guarantee is a guarantee of payment and not
of collection. If any Holder or the Trustee is required by any court or
other-

                                     -119-
<PAGE>

wise to return to the Company or to any Guarantor, or any custodian, trustee,
liquidator or other similar official acting in relation to the Company or such
Guarantor, any amount paid by the Company or such Guarantor to the Trustee or
such Holder, this Guarantee, to the extent theretofore discharged, shall be
reinstated in full force and effect. Each Guarantor further agrees that, as
between it, on the one hand, and the Holders of Securities and the Trustee, on
the other hand, (a) subject to this Article Eleven, the maturity of the
obligations guaranteed hereby may be accelerated as provided in Article Six
hereof for the purposes of this Guarantee, notwithstanding any stay, injunction
or other prohibition preventing such acceleration in respect of the obligations
guaranteed hereby, and (b) in the event of any acceleration of such obligations
as provided in Article Six hereof, such obligations (whether or not due and
payable) shall forthwith become due and payable by the Guarantors for the
purpose of this Guarantee.

          No stockholder, officer, director, employee or incorporator, past,
present or future, or any Guarantor, as such, shall have any personal liability
under this Guarantee by reason of his, her or its status as such stockholder,
officer, director, employee or incorporator.

          Each Guarantor that makes a payment or distribution under its
Guarantee shall be entitled to a contribution from each other Guarantor,
determined in accordance with GAAP.

SECTION 11.02. Limitations on Guarantees.
               -------------------------

          The obligations of each Guarantor under its Guarantee are limited to
the maximum amount which, after giving effect to all other contingent and fixed
liabilities of such Guarantor (including without limitation, its guarantee of
Obligations pursuant to the Credit Agreement and any other Guarantor Senior
Debt) and after giving effect to any collections from or payments made by or on
behalf of any other Guarantor in respect of the obligations of such other
Guarantor under its Guarantee or pursuant to its contribution obligations under
this Indenture, will result in the obligations of such Guarantor under the
Guarantee not constituting a fraudulent conveyance or fraudulent transfer under
federal or state law. Each Guarantor that

                                     -120-
<PAGE>

makes a payment or distribution under a Guarantee shall be entitled to a
contribution from each other Guarantor in an amount pro rata, based on the net
                                                    --- ----
assets of each Guarantor, determined in accordance with GAAP.

SECTION 11.03. Execution and Delivery of Guarantee.
               -----------------------------------

          To further evidence the Guarantee set forth in Section 11.01, each
Guarantor hereby agrees that a notation of such Guarantee, substantially in the
form of Exhibit E hereto, shall be endorsed on each Security authenticated and
        ---------
delivered by the Trustee.  Such Guarantee shall be executed on behalf of each
Guarantor by either manual or facsimile signature of one Officer of each
Guarantor who shall have been duly authorized to so execute by all requisite
corporation action.  The validity and enforceability of any Guarantee shall not
be affected by the fact that it is not affixed to any particular Security.

          Each of the Guarantors hereby agrees that its Guarantee set forth in
Section 11.01 shall remain in full force and effect notwithstanding any failure
to endorse on each Security a notation of such Guarantee.

          If an Officer of a Guarantor whose signature is on this Indenture or a
Guarantee no longer holds that office at the time the Trustee authenticates the
Security on which such Guarantee is endorsed or at any time thereafter, such
Guarantor's Guarantee of such Security shall nevertheless be valid.

          The delivery of any Security by the Trustee, after the authentication
thereof hereunder, shall constitute due delivery of any Guarantee set forth in
this Indenture on behalf of each Guarantor.

SECTION 11.04. Release of a Guarantor.
               ----------------------

          (a)  Upon the sale or disposition of all of the Capital Stock of a
Guarantor by the Company, in a transaction or series of related transactions
that either (i) does not constitute an Asset Sale or (ii) constitutes an Asset
Sale the Net Cash Proceeds of which are applied in accordance with Section 4.16,
or upon the consolidation or merger of a Guarantor with or into any Person in
compliance with Article Five (in

                                     -121-
<PAGE>

each case, other than to the Company or an Affiliate of the Company), or if any
Guarantor is dissolved or liquidated in accordance with this Indenture, such
Guarantor's Guarantee will be automatically discharged and released from all
obligations under this Article Eleven without any further action required on the
part of the Trustee or any Holder. Any Guarantor not so released or the entity
surviving such Guarantor, as applicable, shall remain or be liable under its
Guarantee as provided in this Article Eleven.

          (b)  The Trustee shall deliver an appropriate instrument evidencing
the release of a Guarantor upon receipt of a request by the Company or such
Guarantor accompanied by an Officers' Certificate and an Opinion of Counsel
certifying as to the compliance with this Section 11.04; provided, however, that
                                                         --------  -------
the legal counsel delivering such Opinion of Counsel may rely as to matters of
fact on one or more Officers' Certificates of the Company.

          The Trustee shall execute any documents reasonably requested by the
Company or a Guarantor in order to evidence the release of such Guarantor from
its obligations under its Guarantee endorsed on the Securities and under this
Article Eleven.

          Except as set forth in Articles Four and Five and this Section 11.04,
nothing contained in this Indenture or in any of the Securities shall prevent
any consolidation or merger of a Guarantor with or into the Company or another
Guarantor or shall prevent any sale or conveyance of the property of a Guarantor
as an entirety or substantially as an entirety to the Company or another
Guarantor.

SECTION 11.05. Waiver of Subrogation.
               ---------------------

          Until this Indenture is discharged and all of the Securities are
discharged and paid in full, each Guarantor hereby irrevocably waives and agrees
not to exercise any claim or other rights which it may now or hereafter acquire
against the Company that arise from the existence, payment, performance or
enforcement of the Company's obligations under the Securities or this Indenture
and such Guarantor's obligations under this

                                     -122-
<PAGE>

Guarantee and this Indenture, in any such instance including, without
limitation, any right of subrogation, reimbursement, exoneration, contribution,
indemnification, and any right to participate in any claim or remedy of the
Holders against the Company, whether or not such claim, remedy or right arises
in equity, or under contract, statute or common law, including, without
limitation, the right to take or receive from the Company, directly or
indirectly, in cash or other property or by set-off or in any other manner,
payment or security on account of such claim or other rights. If any amount
shall be paid to any Guarantor in violation of the preceding sentence and any
amounts owing to the Trustee or the Holders of Securities under the Securities,
this Indenture, or any other document or instrument delivered under or in
connection with such agreements or instruments, shall not have been paid in
full, such amount shall have been deemed to have been paid to such Guarantor for
the benefit of, and held in trust for the benefit of, the Trustee or the Holders
and shall forthwith be paid to the Trustee for the benefit of itself or such
Holders to be credited and applied to the obligations in favor of the Trustee or
the Holders, as the case may be, whether matured or unmatured, in accordance
with the terms of this Indenture. Each Guarantor acknowledges that it will
receive direct and indirect benefits from the financing arrangements
contemplated by this Indenture and that the waiver set forth in this Section
11.05 is knowingly made in contemplation of such benefits.

SECTION 11.06. Immediate Payment.
               -----------------

          Each Guarantor agrees to make immediate payment to the Trustee on
behalf of the Holders of all Obligations owing or payable to the respective
Holders upon receipt of a demand for payment therefor by the Trustee to such
Guarantor in writing.

SECTION 11.07. No Set-Off.
               ----------

          Each payment to be made by a Guarantor hereunder in respect of the
Obligations shall be payable in the currency or currencies in which such
Obligations are denominated, and shall be made without set-off, counterclaim,
reduction or diminution of any kind or nature.

                                     -123-
<PAGE>

SECTION 11.08. Obligations Absolute.
               --------------------

          The obligations of each Guarantor hereunder are and shall be absolute
and unconditional and any monies or amounts expressed to be owing or payable by
each Guarantor hereunder which may not be recoverable from such Guarantor on the
basis of a Guarantee shall be recoverable from such Guarantor as a primary
obligor and principal debtor in respect thereof.

SECTION 11.09. Obligations Continuing.
               ----------------------

          The obligations of each Guarantor hereunder shall be continuing and
shall remain in full force and effect until all the obligations have been paid
and satisfied in full.  Each Guarantor agrees with the Trustee that it will from
time to time deliver to the Trustee suitable acknowledgments of this continued
liability hereunder and under any other instrument or instruments in such form
as counsel to the Trustee may advise and as will prevent any action brought
against it in respect of any default hereunder being barred by any statute of
limitations now or hereafter in force and, in the event of the failure of a
Guarantor so to do, it hereby irrevocably appoints the Trustee the attorney and
agent of such Guarantor to make, execute and deliver such written acknowledgment
or acknowledgments or other instruments as may from time to time become
necessary or advisable, in the judgment of the Trustee on the advice of counsel,
to fully maintain and keep in force the liability of such Guarantor hereunder.

SECTION 11.10. Obligations Not Reduced.
               -----------------------

          The obligations of each Guarantor hereunder shall not be satisfied,
reduced or discharged solely by the payment of such principal, premium, if any,
interest, fees and other monies or amounts as may at any time prior to discharge
of this Indenture pursuant to Article Eight be or become owing or payable under
or by virtue of or otherwise in connection with the Securities or this
Indenture.

SECTION 11.11. Obligations Reinstated.
               ----------------------

          The obligations of each Guarantor hereunder shall continue to be
effective or shall be reinstated, as the case

                                     -124-
<PAGE>

may be, if at any time any payment which would otherwise have reduced the
obligations of any Guarantor hereunder (whether such payment shall have been
made by or on behalf of the Company or by or on behalf of a Guarantor) is
rescinded or reclaimed from any of the Holders upon the insolvency, bankruptcy,
liquidation or reorganization of the Company or any Guarantor or otherwise, all
as though such payment had not been made. If demand for, or acceleration of the
time for, payment by the Company is stayed upon the insolvency, bankruptcy,
liquidation or reorganization of the Company, all such Indebtedness otherwise
subject to demand for payment or acceleration shall nonetheless be payable by
each Guarantor as provided herein.

SECTION 11.12. Obligations Not Affected.
               ------------------------

          The obligations of each Guarantor hereunder shall not be affected,
impaired or diminished in any way by any act, omission, matter or thing
whatsoever, occurring before, upon or after any demand for payment hereunder
(and whether or not known or consented to by any Guarantor or any of the
Holders) which, but for this provision, might constitute a whole or partial
defense to a claim against any Guarantor hereunder or might operate to release
or otherwise exonerate any Guarantor from any of its obligations hereunder or
otherwise affect such obligations, whether occasioned by default of any of the
Holders or otherwise, including, without limitation:

          (a)  any limitation of status or power, disability, incapacity or
     other circumstance relating to the Company or any other Person, including
     any insolvency, bankruptcy, liquidation, reorganization, readjustment,
     composition, dissolution, winding-up or other proceeding involving or
     affecting the Company or any other Person;

          (b)  any irregularity, defect, unenforceability or invalidity in
     respect of any indebtedness or other obligation of the Company or any other
     Person under this Indenture, the Securities or any other document or
     instrument;

          (c)  any failure of the Company, whether or not without fault on its
     part, to perform or comply with any of

                                     -125-
<PAGE>

     the provisions of this Indenture or the Securities, or to give notice
     thereof to a Guarantor;

          (d)  the taking or enforcing or exercising or the refusal or neglect
     to take or enforce or exercise any right or remedy from or against the
     Company or any other Person or their respective assets or the release or
     discharge of any such right or remedy;

          (e)  the granting of time, renewals, extensions, compromises,
     concessions, waivers, releases, discharges and other indulgences to the
     Company or any other Person;

          (f)  any change in the time, manner or place of payment of, or in any
     other term of, any of the Securities, or any other amendment, variation,
     supplement, replacement or waiver of, or any consent to departure from, any
     of the Securities or this Indenture, including, without limitation, any
     increase or decrease in the principal amount of or premium, if any, or
     interest on any of the Securities;

          (g)  any change in the ownership, control, name, objects, businesses,
     assets, capital structure or constitution of the Company or a Guarantor;

          (h)  any merger or amalgamation of the Company or a Guarantor with any
     Person or Persons;

          (i)  the occurrence of any change in the laws, rules, regulations or
     ordinances of any jurisdiction by any present or future action of any
     governmental authority or court amending, varying, reducing or otherwise
     affecting, or purporting to amend, vary, reduce or otherwise affect, any of
     the Obligations or the obligations of a Guarantor under its Guarantee; and

          (j)  any other circumstance, including release of the Guarantor
     pursuant to Section 11.04 (other than by complete, irrevocable payment)
     that might otherwise constitute a legal or equitable discharge or defense
     of the Company under this Indenture or the Securities or of a Guarantor in
     respect of its Guarantee hereunder.

                                     -126-
<PAGE>

SECTION 11.13. Waiver.
               ------

          Without in any way limiting the provisions of Section 11.01 hereof,
each Guarantor hereby waives notice of acceptance hereof, notice of any
liability of any Guarantor hereunder, notice or proof of reliance by the Holders
upon the obligations of any Guarantor hereunder, and diligence, presentment,
demand for payment on the Company, protest, notice of dishonor or non-payment of
any of the Obligations, or other notice or formalities to the Company or any
Guarantor of any kind whatsoever.

SECTION 11.14. No Obligation To Take Action Against the Company.
               ------------------------------------------------

          Neither the Trustee nor any other Person shall have any obligation to
enforce or exhaust any rights or remedies or to take any other steps under any
security for the Obligations or against the Company or any other Person or any
property of the Company or any other Person before the Trustee is entitled to
demand payment and performance by any or all Guarantors of their liabilities and
obligations under their Guarantees or under this Indenture.

SECTION 11.15. Dealing with the Company and Others.
               -----------------------------------

          The Holders, without releasing, discharging, limiting or otherwise
affecting in whole or in part the obligations and liabilities of any Guarantor
hereunder and without the consent of or notice to any Guarantor, may

          (a)  grant time, renewals, extensions, compromises, concessions,
     waivers, releases, discharges and other indulgences to the Company or any
     other Person;

          (b)  take or abstain from taking security or collateral from the
     Company or from perfecting security or collateral of the Company;

          (c)  release, discharge, compromise, realize, enforce or otherwise
     deal with or do any act or thing in respect of (with or without
     consideration) any and all collateral, mortgages or other security given by
     the Company or any

                                     -127-
<PAGE>

     third party with respect to the obligations or matters contemplated by this
     Indenture or the Securities;

          (d)  accept compromises or arrangements from the Company;

          (e)  apply all monies at any time received from the Company or from
     any security upon such part of the Obligations as the Holders may see fit
     or change any such application in whole or in part from time to time as the
     Holders may see fit; and

          (f)  otherwise deal with, or waive or modify their right to deal with,
     the Company and all other Persons and any security as the Holders or the
     Trustee may see fit.

SECTION 11.16. Default and Enforcement.
               -----------------------

          If any Guarantor fails to pay in accordance with Section 11.06 hereof,
the Trustee may proceed in its name as trustee hereunder in the enforcement of
the Guarantee of any such Guarantor and such Guarantor's obligations thereunder
and hereunder by any remedy provided by law, whether by legal proceedings or
otherwise, and to recover from such Guarantor the obligations.

SECTION 11.17. Amendment, Etc.
               --------------

          No amendment, modification or waiver of any provision of this
Indenture relating to any Guarantor or consent to any departure by any Guarantor
or any other Person from any such provision will in any event be effective
unless it is signed by such Guarantor and the Trustee.

SECTION 11.18. Acknowledgment.
               --------------

          Each Guarantor hereby acknowledges communication of the terms of this
Indenture and the Securities and consents to and approves of the same.

                                     -128-
<PAGE>

SECTION 11.19. Costs and Expenses.
               ------------------

          Each Guarantor shall pay on demand by the Trustee any and all costs,
fees and expenses (including, without limitation, legal fees on a solicitor and
client basis) incurred by the Trustee, its agents, advisors and counsel or any
of the Holders in enforcing any of their rights under any Guarantee.

SECTION 11.20. No Merger or Waiver; Cumulative Remedies.
               ----------------------------------------

          No Guarantee shall operate by way of merger of any of the obligations
of a Guarantor under any other agreement, including, without limitation, this
Indenture. No failure to exercise and no delay in exercising, on the part of the
Trustee or the Holders, any right, remedy, power or privilege hereunder or under
this Indenture or the Securities, shall operate as a waiver thereof; nor shall
any single or partial exercise of any right, remedy, power or privilege
hereunder or under this Indenture or the Securities preclude any other or
further exercise thereof or the exercise of any other right, remedy, power or
privilege. The rights, remedies, powers and privileges in the Guarantee and
under this Indenture, the Securities and any other document or instrument
between a Guarantor and/or the Company and the Trustee are cumulative and not
exclusive of any rights, remedies, powers and privilege provided by law.

SECTION 11.21. Survival of Obligations.
               -----------------------

          Without prejudice to the survival of any of the other obligations of
each Guarantor hereunder, the obligations of each Guarantor under Section 11.01
shall survive the payment in full of the Obligations and shall be enforceable
against such Guarantor without regard to and without giving effect to any
defense, right of offset or counterclaim available to or which may be asserted
by the Company or any Guarantor.

SECTION 11.22. Guarantee in Addition to Other Obligations.
               ------------------------------------------

          The obligations of each Guarantor under its Guarantee and this
Indenture are in addition to and not in substitution for any other obligations
to the Trustee or to any of the Holders in relation to this Indenture or the
Securities and any

                                     -129-
<PAGE>

guarantees or security at any time held by or for the benefit of any of them.

SECTION 11.23. Severability.
               ------------

          Any provision of this Article Eleven which is prohibited or
unenforceable in any jurisdiction shall not invalidate the remaining provisions
and any such prohibition or unenforceability in any jurisdiction shall not
invalidate or render unenforceable such provision in any other jurisdiction
unless its removal would substantially defeat the basic intent, spirit and
purpose of this Indenture and this Article Eleven.

SECTION 11.24. Successors and Assigns.
               ----------------------

          Each Guarantee shall be binding upon and inure to the benefit of each
Guarantor and the Trustee and the other Holders and their respective successors
and permitted assigns, except that no Guarantor may assign any of its
obligations hereunder or thereunder.

                                ARTICLE TWELVE

                          SUBORDINATION OF GUARANTEE

SECTION 12.01. Guarantee Obligations Subordinated to Guarantor Senior Debt.
               -----------------------------------------------------------

          Anything herein to the contrary notwithstanding, each of the
Guarantors, for itself and its successors, and each Holder, by his or her
acceptance of Guarantees, agrees that the payment of all Obligations owing to
the Holders in respect of its Guarantee (collectively, as to any Guarantor, its
"Guarantee Obligations") is subordinated, to the extent and in the manner
 ---------------------
provided in this Article Twelve, to the prior payment in full in cash or Cash
Equivalents, or such payment duly provided for to the satisfaction of the
holders of Guarantor Senior Debt, of all Obligations on Guarantor Senior Debt of
such Guarantor.

                                     -130-
<PAGE>

          This Article Twelve shall constitute a continuing offer to all Persons
who become holders of, or continue to hold, Guarantor Senior Debt, and such
provisions are made for the benefit of the holders of Guarantor Senior Debt and
such holders are made obligees hereunder and any one or more of them may enforce
such provisions.

SECTION 12.02. Suspension of Guarantee Obligations When Guarantor
               Senior Debt Is in Default.
               --------------------------------------------------

          (a)  If any default occurs and is continuing in the payment when due,
whether at maturity, upon any redemption, by declaration or otherwise, of any
principal of, interest on, unpaid drawings for letters of credit issued in
respect of, or regularly accruing fees with respect to, any Guarantor Senior
Debt, then no payment of any kind or character shall be made by or on behalf of
such Guarantor or any other Person on its behalf with respect to any Guarantee
Obligations or to acquire any of the Securities for cash or property or
otherwise and until such Payment Default shall have been cured or waived or
shall have ceased to exist or such Guarantor Senior Debt shall have been
discharged or paid in full in cash or Cash Equivalents.

          (b)  At any time while any Payment Blockage Period is in existence,
neither any Guarantor nor any other Person on any Guarantor's behalf shall (x)
make any payment of any kind or character with respect to any Obligations on its
Guarantee or (y) acquire any of the Securities for cash or otherwise.

          (c)  In the event that, notwithstanding the foregoing, any payment
shall be received by the Trustee or any Holder when such payment is prohibited
by the foregoing provisions of this Section 12.02, such payment shall be held in
trust for the benefit of, and shall be paid over or delivered to, the holders of
Guarantor Senior Debt (pro rata to such holders on the basis of the respective
amount of Guarantor Senior Debt held by such holders) or their respective
Representatives, as their respective interests may appear.  The Trustee shall be
entitled to rely on information regarding amounts then due and owing on the
Guarantor Senior Debt, if any, received from the holders of Guarantor Senior
Debt (or their Representatives) or, if such

                                     -131-
<PAGE>

information is not received from such holders or their Representatives, from a
Guarantor and only amounts included in the information provided to the Trustee
shall be paid to the holders of Guarantor Senior Debt.

SECTION 12.03. Guarantee Obligations Subordinated to Prior Payment of All
               Guarantor Senior Debt on Dissolution, Liquidation or
               Reorganization of Such Guarantor.
               ----------------------------------------------------------

          (a)  Upon any payment or distribution of assets of any Guarantor of
any kind or character, whether in cash, property or securities, to creditors
upon any total or partial liquidation, dissolution, winding-up, reorganization,
assignment for the benefit of creditors or marshaling of assets of such
Guarantor or in a bankruptcy, reorganization, insolvency, receivership or other
similar proceeding relating to such Guarantor or its property, whether voluntary
or involuntary, all Obligations due or to become due upon all Guarantor Senior
Debt shall first be paid in full in cash or Cash Equivalents, or such payment
duly provided for to the satisfaction of the holders of Guarantor Senior Debt,
before any payment or distribution of any kind or character is made on account
of any Guarantee Obligations or for the acquisition of any of the Securities for
cash or property or otherwise.  Upon any such dissolution, winding-up,
liquidation, reorganization, receivership or similar proceeding, any payment or
distribution of assets of such Guarantor of any kind or character, whether in
cash, property or securities, to which the Holders or the Trustee under this
Indenture would be entitled, except for the provisions hereof, shall be paid by
such Guarantor or by any receiver, trustee in bankruptcy, liquidating trustee,
agent or other Person making such payment or distribution, or by the Holders or
by the Trustee under this Indenture if received by them, directly to the holders
of Guarantor Senior Debt (pro rata to such holders on the basis of the
respective amounts of Guarantor Senior Debt held by such holders) or their
respective Representatives, or to the trustee or trustees under any indenture
pursuant to which any of such Guarantor Senior Debt may have been issued, as
their respective interests may appear, for application to the payment of
Guarantor Senior Debt remaining unpaid until all such Guarantor Senior Debt has
been paid in full in cash or

                                     -132-
<PAGE>

Cash Equivalents after giving effect to any concurrent payment, distribution or
provision therefor to or for the holders of Guarantor Senior Debt.

          (b)  To the extent any payment of Guarantor Senior Debt (whether by or
on behalf of a Guarantor, as proceeds of security or enforcement of any right of
setoff or otherwise) is declared to be fraudulent or preferential, set aside or
required to be paid to any receiver, trustee in bankruptcy, liquidating trustee,
agent or other similar Person under any bankruptcy, insolvency, receivership,
fraudulent conveyance or similar law, then, if such payment is recovered by, or
paid over to, such receiver, trustee in bankruptcy, liquidating trustee, agent
or other similar Person, the Guarantor Senior Debt or part thereof originally
intended to be satisfied shall be deemed to be reinstated and outstanding as if
such payment had not occurred.

          (c)  In the event that, notwithstanding the foregoing, any payment or
distribution of assets of the Company of any kind or character, whether in cash,
property or securities, shall be received by any Holder when such payment or
distribution is prohibited by this Section 12.03, such payment or distribution
shall be held in trust for the benefit of, and shall be paid over or delivered
to, the holders of Guarantor Senior Debt (pro rata to such holders on the basis
of the respective amount of Guarantor Senior Debt held by such holders) or their
respective Representatives, or to the trustee or trustees under any indenture
pursuant to which any of such Guarantor Senior Debt may have been issued, as
their respective interests may appear, for application to the payment of
Guarantor Senior Debt remaining unpaid until all such Guarantor Senior Debt has
been paid in full in cash or Cash Equivalents, after giving effect to any
concurrent payment, distribution or provision therefor to or for the holders of
such Guarantor Senior Debt.

          (d)  The consolidation of any Guarantor with, or the merger of any
Guarantor with or into, another corporation or the liquidation or dissolution of
a Guarantor following the conveyance or transfer of all or substantially all of
its assets, to another corporation upon the terms and conditions provided in
Article Five hereof and as long as permitted under the

                                     -133-
<PAGE>

terms of the Guarantor Senior Debt shall not be deemed a dissolution, winding-
up, liquidation or reorganization for the purposes of this Section if such other
corporation shall, as a part of such consolidation, merger, conveyance or
transfer, assumes the Guarantee of such Guarantor hereunder in accordance with
Article Five hereof.

SECTION 12.04. Payments May Be Paid Prior to Dissolution.
               -----------------------------------------

          Nothing contained in this Article Twelve or elsewhere in this
Indenture shall prevent (i) any Guarantor, except under the conditions described
in Sections 12.02 and 12.03, from making payments at any time for the purpose of
making payments on Guarantee Obligations, or from depositing with the Trustee
any moneys for such payments, or (ii) in the absence of actual knowledge by the
Trustee that a given payment would be prohibited by Section 12.02 or 12.03, the
application by the Trustee of any moneys deposited with it for the purpose of
making such payments on Guarantee Obligations to the Holders entitled thereto
unless at least two Business Days prior to the date upon which such payment
would otherwise become due and payable a Trust Officer shall have actually
received the written notice provided for in the first sentence of Section
10.02(b) or in Section 12.07 (provided that, notwithstanding the foregoing, the
                              --------
Holders receiving any payments made in contravention of Sections 12.02 and/or
12.03 (and the respective such payments) shall otherwise be subject to the
provisions of Section 12.02 and Section 12.03). Each Guarantor shall give prompt
written notice to the Trustee of any dissolution, winding-up, liquidation or
reorganization of such Guarantor, although any delay or failure to give any such
notice shall have no effect on the subordination provisions contained herein.

SECTION 12.05. Holders of Guarantee Obligations To Be Subrogated to Rights of
               Holders of Guarantor Senior Debt.
               --------------------------------------------------------------

          Subject to the payment in full in cash or Cash Equivalents of all
Guarantor Senior Debt, the Holders of Guarantee Obligations of any Guarantor
shall be subrogated to the rights of the holders of Guarantor Senior Debt of
such Guaran-

                                     -134-
<PAGE>

tor to receive payments or distributions of cash, property or securities of such
Guarantor applicable to such Guarantor Senior Debt until all amounts owing on or
in respect of the Guarantee Obligations shall be paid in full; and, for the
purposes of such subrogation, no such payments or distributions to the holders
of such Guarantor Senior Debt by or on behalf of such Guarantor, or by or on
behalf of the Holders by virtue of this Article Twelve, which otherwise would
have been made to the Holders shall, as between such Guarantor and the Holders,
be deemed to be a payment by such Guarantor to or on account of such Guarantor
Senior Debt, it being understood that the provisions of this Article Twelve are
and are intended solely for the purpose of defining the relative rights of the
Holders, on the one hand, and the holders of Guarantor Senior Debt, on the other
hand.

SECTION 12.06. Obligations of the Guarantors Unconditional.
               -------------------------------------------

          Nothing contained in this Article Twelve or elsewhere in this
Indenture or in the Guarantees is intended to or shall impair, as among the
Guarantors, their creditors other than the holders of Guarantor Senior Debt, and
the Holders, the obligation of the Guarantors, which is absolute and
unconditional, to pay to the Holders all amounts due and payable under the
Guarantees as and when the same shall become due and payable in accordance with
their terms, or is intended to or shall affect the relative rights of the
Holders and creditors of the Guarantors other than the holders of the Guarantor
Senior Debt, nor shall anything herein or therein prevent any Holder or the
Trustee on its behalf from exercising all remedies otherwise permitted by
applicable law upon default under this Indenture, subject to the rights, if any,
in respect of cash, property or securities of the Guarantors received upon the
exercise of any such remedy.

SECTION 12.07. Notice to Trustee.
               -----------------

          Each Guarantor shall give prompt written notice to the Trustee of any
fact known to such Guarantor which would prohibit the making of any payment to
or by the Trustee in respect of the Guarantees pursuant to the provisions of
this Article Twelve, although any delay or failure to give any such

                                     -135-
<PAGE>

notice shall have no effect on the subordination provisions contained herein.
Regardless of anything to the contrary contained in this Article Twelve or
elsewhere in this Indenture, the Trustee shall not be charged with knowledge of
the existence of any default or event of default with respect to any Guarantor
Senior Debt or of any other facts which would prohibit the making of any payment
to or by the Trustee unless and until the Trustee shall have received notice in
writing from a Guarantor, or from a holder of Guarantor Senior Debt or a
Representative therefor and, prior to the receipt of any such written notice,
the Trustee shall be entitled to assume (in the absence of actual knowledge to
the contrary) that no such facts exist. The Trustee shall be entitled to rely on
the delivery to it of any notice pursuant to this Section 12.07 to establish
that such notice has been given by a holder of Senior Debt (or a trustee
thereof).

          In the event that the Trustee determines in good faith that any
evidence is required with respect to the right of any Person as a holder of
Guarantor Senior Debt to participate in any payment or distribution pursuant to
this Article Twelve, the Trustee may request such Person to furnish evidence to
the reasonable satisfaction of the Trustee as to the amounts of Guarantor Senior
Debt held by such Person, the extent to which such Person is entitled to
participate in such payment or distribution and any other facts pertinent to the
rights of such Person under this Article Twelve, and if such evidence is not
furnished the Trustee may defer any payment to such Person pending judicial
determination as to the right of such Person to receive such payment.

SECTION 12.08. Reliance on Judicial Order or Certificate of Liquidating Agent.
               --------------------------------------------------------------

          Upon any payment or distribution of assets of a Guarantor referred to
in this Article Twelve, the Trustee, subject to the provisions of Article Seven
hereof, and the Holders shall be entitled to rely upon any order or decree made
by any court of competent jurisdiction in which any insolvency, bankruptcy,
receivership, dissolution, winding-up, liquidation, reorganization or similar
case or proceeding is pending, or upon a certificate of the trustee in
bankruptcy, liquidating trus-

                                     -136-
<PAGE>

tee, receiver, assignee for the benefit of creditors, agent or other person
making such payment or distribution, delivered to the Trustee or the Holders,
for the purpose of ascertaining the persons entitled to participate in such
payment or distribution, the holders of the Guarantor Senior Debt and other
Indebtedness of such Guarantor, the amount thereof or payable thereon, the
amount or amounts paid or distributed thereon and all other facts pertinent
thereto or to this Article Twelve.

SECTION 12.09. Trustee's Relation to Guarantor Senior Debt.
               -------------------------------------------

          The Trustee and any agent of a Guarantor or the Trustee shall be
entitled to all the rights set forth in this Article Twelve with respect to any
Guarantor Senior Debt which may at any time be held by it in its individual or
any other capacity to the same extent as any other holder of Guarantor Senior
Debt and nothing in this Indenture shall deprive the Trustee or any such agent
of any of its rights as such holder.

          With respect to the holders of Guarantor Senior Debt, the Trustee
undertakes to perform or to observe only such of its covenants and obligations
as are specifically set forth in this Article Twelve, and no implied covenants
or obligations with respect to the holders of Guarantor Senior Debt shall be
read into this Indenture against the Trustee.  The Trustee shall not be deemed
to owe any fiduciary duty to the holders of Guarantor Senior Debt.

          Whenever a distribution is to be made or a notice given to holders or
owners of Guarantor Senior Debt, the distribution may be made and the notice may
be given to their Representative, if any.

SECTION 12.10. Subordination Rights Not Impaired by Acts or Omissions of the
               Guarantors or Holders of Guarantor Senior Debt.
               -------------------------------------------------------------

          No right of any present or future holders of any Guarantor Senior Debt
to enforce subordination as provided herein shall at any time in any way be
prejudiced or impaired by any act or failure to act on the part of any Guarantor
or by any act or failure to act, in good faith, by any such holder,

                                     -137-
<PAGE>

or by any noncompliance by any Guarantor with the terms of this Indenture,
regardless of any knowledge thereof which any such holder may have or otherwise
be charged with.

          Without in any way limiting the generality of the foregoing paragraph,
the holders of Guarantor Senior Debt may, at any time and from time to time,
without the consent of or notice to the Trustee, without incurring
responsibility to the Trustee or the Holders of the Securities and without
impairing or releasing the subordination provided in this Article Twelve or the
obligations hereunder of the Holders of the Securities to the holders of
Guarantor Senior Debt, do any one or more of the following:  (i) change the
manner, place or terms of payment or extend the time of payment of, or renew or
alter, Guarantor Senior Debt, or otherwise amend or supplement in any manner
Guarantor Senior Debt, or any instrument evidencing the same or any agreement
under which Guarantor Senior Debt is outstanding; (ii) sell, exchange, release
or otherwise deal with any property pledged, mortgaged or otherwise securing
Guarantor Senior Debt; (iii) release any Person liable in any manner for the
payment or collection of Guarantor Senior Debt; and (iv) exercise or refrain
from exercising any rights against the Guarantors and any other Person.

SECTION 12.11. Holders Authorize Trustee To Effectuate Subordination of
               Guarantee Obligations.
               --------------------------------------------------------

          Each Holder of Guarantee Obligations by its acceptance of them
authorizes and expressly directs the Trustee on its behalf to take such action
as may be necessary or appropriate to effectuate, as between the holders of
Guarantor Senior Debt and the Holders, the subordination provided in this
Article Twelve, and appoints the Trustee its attorney-in-fact for such purposes,
including, in the event of any dissolution, winding-up, liquidation or
reorganization of any Guarantor (whether in bankruptcy, insolvency,
receivership, reorganization or similar proceedings or upon an assignment for
the benefit of credits or otherwise) tending towards liquidation of the business
and assets of any Guarantor, the filing of a claim for the unpaid balance under
its Guarantee Obligations and accrued interest in the form required in those
proceedings.

                                     -138-
<PAGE>

          If the Trustee does not file a proper claim or proof of debt in the
form required in such proceeding prior to 30 days before the expiration of the
time to file such claim or claims, then the holders of the Guarantor Senior Debt
or their Representative are or is hereby authorized to have the right to file
and are or is hereby authorized to file an appropriate claim for and on behalf
of the Holders of said Guarantee Obligations.  Nothing herein contained shall be
deemed to authorize the Trustee or the holders of Guarantor Senior Debt or their
Representative to authorize or consent to or accept or adopt on behalf of any
Holder any plan of reorganization, arrangement, adjustment or composition
affecting the Guarantee Obligations or the rights of any Holder thereof, or to
authorize the Trustee or the holders of Guarantor Senior Debt or their
Representative to vote in respect of the claim of any Holder in any such
proceeding.

SECTION 12.12. This Article Twelve Not To Prevent Events of Default.
               ----------------------------------------------------

          The failure to make a payment on account of principal of or interest
on the Guarantees by reason of any provision of this Article Twelve will not be
construed as preventing the occurrence of an Event of Default.

SECTION 12.13. Trustee's Compensation Not Prejudiced.
               --------------------------------------

          Nothing in this Article Twelve will apply to amounts due to the
Trustee pursuant to other sections of this Indenture.

                                ARTICLE THIRTEEN

                                 MISCELLANEOUS

SECTION 13.01. TIA Controls.
               ------------

          If any provision of this Indenture limits, qualifies, or conflicts
with another provision which is required or deemed

                                     -139-
<PAGE>

to be included in this Indenture by the TIA, such required or deemed provision
shall control.

SECTION 13.02. Notices.
               -------

          Any notices or other communications required or permitted hereunder
shall be in writing, and shall be sufficiently given if made by hand delivery,
by telex, by telecopier or registered or certified mail, postage prepaid, return
receipt requested, addressed as follows:

          if to the Company or a Guarantor:
          Building One Services Corporation
          800 Connecticut Avenue, NW
          Washington, DC  20006
          Attention:  Chief Financial Officer

          Telephone:  (202) 261-6000
          Facsimile:  (202) 261-6020

          with a copy to:

          Morgan Lewis & Bockius LLP
          1800 M Street, NW
          Washington, DC  20036
          Attention:  Linda L. Griggs

          Telephone:  (202) 467-7245
          Facsimile:  (202) 467-7176

          if to the Trustee:

          IBJ Whitehall Bank & Trust Company
          One State Street
          New York, NY  10004
          Attention:  Corporate Trust Administration

          Telephone:  (212) 858-2657
          Facsimile:  (212) 858-2592

          Each of the Company and the Trustee by written notice to each other
such Person may designate additional or different

                                     -140-
<PAGE>

addresses for notices to such Person. Any notice or communication to the Company
and the Trustee, shall be deemed to have been given or made as of the date so
delivered if personally delivered; when answered back, if telexed; when receipt
is acknowledged, if telecopied; and five (5) calendar days after mailing if sent
by registered or certified mail, postage prepaid (except that a notice of change
of address shall not be deemed to have been given until actually received by the
addressee).

          Any notice or communication mailed to a Securityholder shall be mailed
to him by first class mail or other equivalent means at his address as it
appears on the registration books of the Registrar and shall be sufficiently
given to him if so mailed within the time prescribed.

          Failure to mail a notice or communication to a Securityholder or any
defect in it shall not affect its sufficiency with respect to other
Securityholders.  If a notice or communication is mailed in the manner provided
above, it is duly given, whether or not the addressee receives it.

SECTION 13.03. Communications by Holders with Other Holders.
               --------------------------------------------

          Securityholders may communicate pursuant to TIA (S) 312(b) with other
Securityholders with respect to their rights under this Indenture, the
Securities or the Guarantees.  The Company, the Trustee, the Registrar and any
other Person shall have the protection of TIA (S) 312(c).

SECTION 13.04. Certificate and Opinion as to Conditions Precedent.
               --------------------------------------------------

          Upon any request or application by the Company to the Trustee to take
any action under this Indenture, the Company shall furnish to the Trustee at the
request of the Trustee:

          (1)  an Officers' Certificate, in form and substance satisfactory to
     the Trustee, stating that, in the opinion of the signers, all conditions
     precedent to be performed or effected by the Company, if any, provided for
     in this

                                     -141-
<PAGE>

     Indenture relating to the proposed action have been complied with; and

          (2)  an Opinion of Counsel stating that, in the opinion of such
     counsel, any and all such conditions precedent have been complied with.

SECTION 13.05. Statements Required in Certificate or Opinion.
               ---------------------------------------------

          Each certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture, other than the Officers'
Certificate required by Section 4.08, 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 each such
     Person, such condition or covenant has been complied with; provided,
                                                                --------
     however, that with respect to matters of fact an Opinion of Counsel may
     -------
     rely on an Officers' Certificate or certificates of public officials.

SECTION 13.06. Rules by Trustee, Paying Agent, Registrar.
               -----------------------------------------

          The Trustee, Paying Agent or Registrar may make reasonable rules for
its functions.

                                     -142-
<PAGE>

SECTION 13.07. Legal Holidays.
               --------------

          If a payment date is not a Business Day, payment may be made on the
next succeeding day that is a Business Day.

SECTION 13.08. Governing Law.
               -------------

          THIS INDENTURE, THE SECURITIES AND THE GUARANTEES WILL BE GOVERNED BY
AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, AS APPLIED
TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO
PRINCIPLES OF CONFLICTS OF LAW.  Each of the parties hereto agrees to submit to
the jurisdiction of the courts of the State of New York in any action or
proceeding arising out of or relating to this Indenture, the Securities or the
Guarantees.

SECTION 13.09. No Adverse Interpretation of Other Agreements.
               ---------------------------------------------

          This Indenture may not be used to interpret another indenture, loan or
debt agreement of any of the Company or any of its Subsidiaries.  Any such
indenture, loan or debt agreement may not be used to interpret this Indenture.

SECTION 13.10. No Recourse Against Others.
               --------------------------

          A director, officer, employee, stockholder or incorporator, as such,
of the Company or any of its subsidiaries shall not have any liability for any
obligations of the Company under the Securities, this Indenture or the
Guarantees or for any claim based on, in respect of or by reason of such
obligations or their creation.  Each Securityholder by accepting a Security
waives and releases all such liability.  Such waiver and release are part of the
consideration for the issuance of the Securities.

SECTION 13.11. Successors.
               ----------

          All agreements of the Company and the Guarantors in this Indenture,
the Securities and the Guarantees shall bind their respective successors.  All
agreements of the Trustee in this Indenture shall bind its successor.

                                     -143-
<PAGE>

SECTION 13.12. Duplicate Originals.
               -------------------

          All parties may sign any number of copies of this Indenture.  Each
signed copy or counterpart shall be an original, but all of them together shall
represent the same agreement.

SECTION 13.13. Severability.
               ------------

          In case any one or more of the provisions in this Indenture, in the
Securities or in the Guarantees shall be held invalid, illegal or unenforceable,
in any respect for any reason, the validity, legality and enforceability of any
such provision in every other respect and of the remaining provisions shall not
in any way be affected or impaired thereby, it being intended that all of the
provisions hereof shall be enforceable to the full extent permitted by law.

                                     -144-
<PAGE>

                                   SIGNATURES

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

                                       BUILDING ONE SERVICES CORPORATION,
                                       as Issuer


                                       By:  _____________________________
                                            Name:
                                            Title:

                                       By:  _____________________________
                                            Name:
                                            Title:

                                       ADVENT ELECTRIC CO., INC.
                                       AMERICAN AIR COMPANY, INC.
                                       APPEARANCE MANAGEMENT SERVICES, INC.
                                       BELTLINE MECHANICAL SERVICES, INC.
                                       BOXBERGER, INC.
                                       BRICK, INC.
                                       BUILDING ONE MECHANICAL SERVICES, INC.
                                       BUILDING ONE SERVICE SOLUTIONS, INC.
                                       BUYR, INC.
                                       CENTER SERVICES, INC.
                                       CONSOLIDATED ELECTRICAL GROUP, INC.
                                       D/FW MECHANICAL SERVICES, INC.
                                       FLOR-SHIN, INC.
                                       GAMEWELL MECHANICAL, INC.
                                       GARFIELD-INDECON ELECTRICAL SERVICES,
                                        INC.
                                       G.S. GROUP, INC.
                                       G.S. FINANCIAL, INC.
                                       GULF STATES, INC.

                                      S-1
<PAGE>

                                       G.S.I. OF CALIFORNIA, INC.
                                       TESTRONICS, INC.
                                       BRAZOSPORT MANAGEMENT, INC.
                                       HUNT ELECTRIC, INC.
                                       IVEY MECHANICAL COMPANY, INC.
                                       BARNES IVEY MECHANICAL COMPANY, L.L.C.
                                       LEXINGTON/IVEY MECHANICAL COMPANY, LLC
                                       IVEY MECHANICAL SERVICES, L.L.C.
                                       THE LEWIS COMPANIES, INC.
                                       OIL CAPITAL ELECTRIC, INC.
                                       ENGINEERING DESIGN GROUP, INC.
                                       ELECTRICAL DESIGN & CONSTRUCTION, INC.
                                       FRED CLARK ELECTRICAL CONTRACTOR, INC.
                                       OMNI MECHANICAL COMPANY
                                       OMNI MECHANICAL SERVICES
                                       MCINTOSH MECHANICAL, INC.
                                       NATIONAL NETWORK SERVICES, INC.
                                       PERIMETER MAINTENANCE CORPORATION
                                       POTTER ELECTRIC CO., INC.
                                       REGENCY ELECTRIC COMPANY, INC.
                                       REGENCY ELECTRIC COMPANY JACKSONVILLE
                                        OFFICE, INC.
                                       REGENCY ELECTRIC COMPANY ORLANDO
                                        OFFICE, INC.
                                       REGENCY ELECTRIC COMPANY ATLANTA
                                        OFFICE
                                       REGENCY ELECTRIC COMPANY MEMPHIS
                                        OFFICE, INC.
                                       REGENCY ELECTRIC COMPANY PROJECTS
                                        GROUP, INC.
                                       REGENCY ELECTRIC COMPANY SOUTH
                                        FLORIDA, INC.
                                       REGENCY ELECTRIC COMPANY
                                        CHARLOTTE OFFICE, INC.
                                       RELIABLE PAPER SERVICE COMPANY, INC.
                                       RIVIERA ELECTRIC CONSTRUCTION CO.

                                      S-2
<PAGE>

                                       RIVIERA ELECTRIC OF CALIFORNIA, INC.
                                       ROBINSON MECHANICAL COMPANY
                                       SANDERS BROS., INC.
                                       SKC ELECTRIC, INC.
                                       CRAMAR ELECTRIC, INC.
                                       SKCE, INC.
                                       PRO WIRE SECURITY SYSTEMS, INC.
                                       SPANN BUILDING MAINTENANCE COMPANY
                                       SPANN MANAGEMENT GROUP, INC.
                                       TAYLOR ELECTRIC, INC.
                                       TESS HOLDINGS, INC.
                                       CREST INTERNATIONAL, LLC
                                       TOWN & COUNTRY ELECTRIC, INC.
                                       TRI-CITY ELECTRICAL CONTRACTORS, INC.
                                       TRI-M HOLDING CORP.
                                       TRI-M CORPORATION
                                       TRI-M ELECTRICAL CONSTRUCTION CORP.
                                       TRI-M BUILDING AUTOMATION SYSTEMS CORP.
                                       TRI-M INFORMATION SYSTEMS CORP.
                                       TRI-M INTEGRATED SYSTEM SOLUTIONS CORP.
                                       WALKER ENGINEERING, INC.
                                       WARREN ELECTRICAL CONSTRUCTION CORP.
                                       WATSON ELECTRICAL CONSTRUCTION CO.
                                       WILSON ELECTRIC COMPANY, INC.
                                       CHAMBERS ELECTRONIC COMMUNICATIONS, INC.


                                       By:  ____________________________
                                            Name:
                                            Title:

                                      S-3
<PAGE>

                                       IBJ WHITEHALL BANK & TRUST COMPANY,
                                         as Trustee


                                       By:  ____________________________
                                            Name:
                                            Title:

                                      S-4
<PAGE>

                       BUILDING ONE SERVICES CORPORATION
                        10 1/2% Senior Subordinated Note
                                due May 1, 2009

                                                CUSIP No.

No.                                                 $

          BUILDING ONE SERVICES CORPORATION, a Delaware corporation (the
"Company", which term includes any successor corporation), for value received
promises to pay to CEDE & CO. or registered assigns, the principal sum of
on May 1, 2009.

          Interest Payment Dates:  May 1 and November 1, commencing November 1,
1999.

          Record Dates:  April 15 and October 15.

          Reference is made to the further provisions of this Security contained
herein, which will for all purposes have the same effect as if set forth at this
place.

          IN WITNESS WHEREOF, the Company has caused this Security to be signed
manually or by facsimile by its duly authorized officers.

Dated:  April 30, 1999

                                         BUILDING ONE SERVICES CORPORATION

                                         By: ______________________
                                             Name:
                                             Title:

                                         By: ______________________
                                             Name
                                             Title:

                                      A-1
<PAGE>

               [FORM OF TRUSTEE'S CERTIFICATE OF AUTHENTICATION]

          This is one of the 10 1/2% Senior Subordinated Notes due 2009
described in the within-mentioned Indenture.

Dated:  April 30, 1999                   IBJ WHITEHALL BANK & TRUST COMPANY,
                                          as Trustee

                                         By: ____________________________
                                                 Authorized Signatory

                                      A-2
<PAGE>

                             (REVERSE OF SECURITY)

                       BUILDING ONE SERVICES CORPORATION

                        10 1/2% Senior Subordinated Note

                                due May 1, 2009

1.   Interest.
     --------

          BUILDING ONE SERVICES CORPORATION, a Delaware corporation (the
"Company"), promises to pay interest on the principal amount of this Security at
the rate per annum shown above.  The Company will pay interest semi-annually on
May 1 and November 1 of each year (the "Interest Payment Date"), commencing
November 1, 1999.  Interest on this Security will accrue from the most recent
date to which interest has been paid or, if no interest has been paid, from
April 30, 1999.  Interest on this Security will be computed on the basis of a
360-day year of twelve 30-day months.

          The Company shall pay interest on overdue principal from time to time
on demand at the rate borne by this Security plus 2% and on overdue installments
of interest (without regard to any applicable grace periods) to the extent
lawful.

2.   Method of Payment.
     -----------------

          The Company shall pay interest on the Securities (except defaulted
interest) to the persons who are the registered Holders at the close of business
on the Record Date immediately preceding the Interest Payment Date even if the
Securities are cancelled on registration of transfer or registration of exchange
after such Record Date.  Holders must surrender Securities to a Paying Agent to
collect principal payments.  The Company shall pay principal and interest in
money of the United States that at the time of payment is legal tender for
payment of public and private debts ("U.S. Legal Tender").  However, the Company
may pay principal and interest by wire transfer of Federal funds, or interest by
check payable in such U.S. Legal Tender.  The Company may deliver any such
interest payment to the Paying Agent or to a Holder at the Holder's registered
address.

                                      A-3
<PAGE>

3.   Paying Agent and Registrar.
     --------------------------

          Initially, IBJ Whitehall Bank & Trust Company (the "Trustee") will act
as Paying Agent and Registrar.  The Company may change any Paying Agent,
Registrar or co-Registrar without notice to the Holders.  The Company or any of
its Subsidiaries may, subject to certain exceptions, act as Registrar or co-
Registrar.

4.   Indenture.
     ---------

          The Company issued the Securities under an Indenture, dated as of
April 30, 1999 (the "Indenture"), among the Company, the Guarantors named
therein and the Trustee.  This Security is one of a duly authorized issue of
Securities of the Company designated as its 10 1/2% Senior Subordinated Notes
due 2009 (the "Securities").  The Securities are treated as a single class of
securities under the Indenture unless otherwise specified in the Indenture.
Capitalized terms herein are used as defined in the Indenture unless otherwise
defined herein.  The terms of the Securities include those stated in the
Indenture and those made part of the Indenture by reference to the Trust
Indenture Act of 1939 (15 U.S.C. (S)(S) 77aaa-77bbbb) (the "TIA"), as in effect
on the date of the Indenture until such time as the Indenture is qualified under
the TIA, and thereafter as in effect on the date on which the Indenture is
qualified under the TIA.  Notwithstanding anything to the contrary herein, the
Securities are subject to all such terms, and Holders of Securities are referred
to the Indenture and the TIA for a statement of them.  The Securities are
general obligations of the Company limited in aggregate principal amount to
$400,000,000.

5.   Subordination.
     -------------

          The Securities are subordinated in right of payment, in the manner and
to the extent set forth in the Indenture, to the prior payment in full in cash
or Cash Equivalents of all Senior Debt of the Company, whether outstanding on
the date of the Indenture or thereafter created, incurred, assumed or
guaranteed.  Each Holder by his acceptance hereof agrees to be bound by such
provisions and authorizes and expressly directs the Trustee, on his behalf, to
take such action as may be nec-

                                      A-4
<PAGE>

essary or appropriate to effectuate the subordination provided for in the
Indenture and appoints the Trustee his attorney-in-fact for such purposes.

6.   Optional Redemption.
     -------------------

          The Securities will be redeemable, at the Company's option, in whole
at any time or in part from time to time, on and after May 1, 2004, upon not
less than 30 nor more than 60 days' notice, at the following redemption prices
(expressed as percentages of the principal amount) if redeemed during the
twelve-month period commencing on May 1 of the years set forth below, plus, in
each case, accrued and unpaid interest thereon, if any, to the date of
redemption:

<TABLE>
<CAPTION>
       Year                                    Percentage
       ----                                    ----------
       <S>                                     <C>
       2004...............................      105.438%
       2005...............................      104.350%
       2006...............................      103.263%
       2007...............................      102.175%
       2008...............................      101.088%
       2009 and thereafter................      100.000%
</TABLE>

7.  Optional Redemption upon Equity Offerings.
    --------------------------------------------

          At any time, or from time to time, on or prior to May 1, 2002, the
Company may, at its option, use the net cash proceeds of one or more Equity
Offerings to redeem up to 35% aggregate principal amount of the Securities
issued pursuant to the Indenture at a redemption price equal to 110.875% of the
principal amount thereof, plus accrued and unpaid interest thereon, if any, to
the date of redemption; provided that after any such redemption the aggregate
                        --------
principal amount of Securities outstanding must equal at least 65% of the
aggregate principal amount of the Securities issued pursuant to the Indenture.
In order to effect the foregoing redemption with the net cash proceeds of any
Equity Offering, the Company shall make such redemption not more than 90 days
after the consummation of any such Equity Offering.

          As used in the preceding paragraph, "Equity Offering" means a public
or private offering of Qualified Capital Stock

                                      A-5
<PAGE>

(other than public offerings with respect to the Company's Common Stock on Form
S-8 or any replacement form for the Form S-8) of the Company for aggregate net
cash proceeds to the Company of at least $20 million.

8.   Notice of Redemption.
     --------------------

          Notice of redemption will be mailed at least 30 days but not more than
60 days before the Redemption Date to each Holder of Securities to be redeemed
at such Holder's registered address.  Securities in denominations of $1,000 may
be redeemed only in whole.  The Trustee may select for redemption portions
(equal to $1,000 or any integral multiple thereof) of the principal of
Securities that have denominations larger than $1,000.

          If any Security is to be redeemed in part only, the notice of
redemption that relates to such Security shall state the portion of the
principal amount thereof to be redeemed.  A new Security in a principal amount
equal to the unredeemed portion thereof will be issued in the name of the Holder
thereof upon cancellation of the original Security.  On and after the Redemption
Date, interest will cease to accrue on Securities or portions thereof called for
redemption.

9.   Change of Control Offer.
     -----------------------

          Upon the occurrence of a Change of Control, the Company will be
required to offer to purchase all of the outstanding Securities at a purchase
price equal to 101% of the principal amount thereof, plus accrued and unpaid
interest, if any, thereon to the date of repurchase.

10.  Limitation on Asset Sales.
     -------------------------

          The Company is, subject to certain conditions, obligated to make an
offer to purchase Securities at 100% of their principal amount, plus accrued and
unpaid interest, if any, thereon to the date of repurchase with certain net cash
proceeds of certain sales or other dispositions of assets in accordance with the
Indenture.

                                      A-6
<PAGE>

11.  Denominations; Transfer; Exchange.
     ---------------------------------

          The Securities are in registered form, without coupons, in
denominations of $1,000 and integral multiples of $1,000.  A Holder shall
register the transfer of or exchange Securities in accordance with the
Indenture.  The Registrar may require a Holder, among other things, to furnish
appropriate endorsements and transfer documents and to pay certain transfer
taxes or similar governmental charges payable in connection therewith as
permitted by the Indenture.  The Registrar need not register the transfer of or
exchange any Securities or portions thereof selected for redemption, except the
unredeemed portion of any security being redeemed in part.

12.  Persons Deemed Owners.
     ---------------------

          The registered Holder of a Security shall be treated as the owner of
it for all purposes.

13.  Unclaimed Funds.
     ---------------

          If funds for the payment of principal or interest remain unclaimed for
one year, the Trustee and the Paying Agent will repay the funds to the Company
at its request.  After that, all liability of the Trustee and such Paying Agent
with respect to such funds shall cease.

14.  Discharge Prior to Redemption or Maturity.
     -----------------------------------------

          The Company and the Guarantors may be discharged from their
obligations under the Indenture, the Securities and the Guarantees except for
certain provisions thereof, and may be discharged from obligations to comply
with certain covenants contained in the Indenture, the Securities and the
Guarantees, in each case upon satisfaction of certain conditions specified in
the Indenture.

15.  Amendment; Supplement; Waiver.
     -----------------------------

          Subject to certain exceptions, the Indenture, the Securities and the
Guarantees may be amended or supplemented with the written consent of the
Holders of at least a majority in aggregate principal amount of the Securities
then outstanding, and any existing Default or Event of Default or compliance
with

                                      A-7
<PAGE>

any provision may be waived with the consent of the Holders of a majority in
aggregate principal amount of the Securities then outstanding. Without notice to
or consent of any Holder, the parties thereto may amend or supplement the
Indenture, the Securities and the Guarantees to, among other things, cure any
ambiguity, defect or inconsistency, provide for uncertificated Securities in
addition to or in place of certificated Securities or comply with any
requirements of the Commission in connection with the qualification of the
Indenture under the TIA, or make any other change that does not materially
adversely affect the rights of any Holder of a Security.

16.  Restrictive Covenants.
     ---------------------

          The Indenture contains certain covenants that, among other things,
limit the ability of the Company and its Restricted Subsidiaries to make
restricted payments, to incur indebtedness, to create liens, to sell assets, to
permit restrictions on dividends and other payments by Restricted Subsidiaries
of the Company to the Company, to consolidate, merge or sell all or
substantially all of its assets or to engage in transactions with affiliates.
The limitations are subject to a number of important qualifications and
exceptions.  The Company must annually report to the Trustee on compliance with
such limitations.

17.  Defaults and Remedies.
     ---------------------

          If an Event of Default occurs and is continuing, the Trustee or the
Holders of at least 25% in aggregate principal amount of Securities then
outstanding may declare all the Securities to be due and payable immediately in
the manner and with the effect provided in the Indenture.  Holders of Securities
may not enforce the Indenture, the Securities or the Guarantees except as
provided in the Indenture.  The Trustee is not obligated to enforce the
Indenture, the Securities or the Guarantees unless it has received indemnity
satisfactory to it.  The Indenture permits, subject to certain limitations
therein provided, Holders of a majority in aggregate principal amount of the
Securities then outstanding to direct the Trustee in its exercise of any trust
or power.  The Trustee may withhold from Holders of Securities notice of certain
continuing Defaults or

                                      A-8
<PAGE>

Events of Default if it determines that withholding notice is in their interest.

18.  Trustee Dealings with Company.
     -----------------------------

          The Trustee under the Indenture, in its individual or any other
capacity, may become the owner or pledgee of Securities and may otherwise deal
with the Company, its Subsidiaries or their respective Affiliates as if it were
not the Trustee.

19.  No Recourse Against Others.
     --------------------------

          No stockholder, director, officer, employee or incorporator, as such,
of the Company or any Subsidiary of the Company shall have any liability for any
obligation of the Company under the Securities or the Indenture or for any claim
based on, in respect of or by reason of, such obligations or their creation.
Each Holder of a Security by accepting a Security waives and releases all such
liability.  The waiver and release are part of the consideration for the
issuance of the Securities.

20.  Authentication.
     --------------

          This Security shall not be valid until the Trustee or authenticating
agent signs the certificate of authentication on this Security.

21.  Abbreviations and Defined Terms.
     -------------------------------

          Customary abbreviations may be used in the name of a Holder of a
Security or an assignee, such as:  TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

22.  Governing Law.
     -------------

          This Security shall be governed by, and construed in accordance with,
the laws of the State of New York without giving effect to applicable principles
of conflicts of laws to the extent that the application of the laws of another
jurisdiction would be required thereby.

                                      A-9
<PAGE>

23.  CUSIP Numbers.
     -------------

          Pursuant to a recommendation promulgated by the Committee on Uniform
Security Identification Procedures, the Company has caused CUSIP numbers to be
printed on the Securities as a convenience to the Holders of the Securities.  No
representation is made as to the accuracy of such numbers as printed on the
Securities and reliance may be placed only on the other identification numbers
printed hereon.

24.  Registration Rights. ??^^
     -------------------

          Pursuant to, but subject to the exceptions in, the Registration Rights
Agreement, the Company and the Guarantors will be obligated to consummate an
exchange offer pursuant to which the Holder of this Security shall have the
right to exchange this Security for a 10 1/2% Senior Subordinated Note due 2009
of the Company which shall have been registered under the Securities Act, in
like principal amount and having terms identical in all material respects as
this Security.  The Holders shall be entitled to receive certain additional
interest payments in the event such exchange offer is not consummated or the
Securities are not offered for resale and upon certain other conditions, all
pursuant to and in accordance with the terms of the Registration Rights
Agreement.

25.  Indenture.
     ---------

          Each Holder, by accepting a Security, agrees to be bound by all of the
terms and provisions of the Indenture, as the same may be amended from time to
time.  Capitalized terms used herein and not defined herein have the meanings
ascribed thereto in the Indenture.

26.  Guarantees.
     ----------

          This Security will be entitled to the benefits of certain senior
subordinated Guarantees made for the benefit of the Holders.  Reference is
hereby made to the Indenture for a

___________________________
??^^  Not applicable to Form of Exchange Securities.

                                     A-10
<PAGE>

statement of the respective rights, limitations of rights, duties and
obligations thereunder of the Guarantors, the Trustee and the Holders.

          The Company will furnish to any Holder of a Security upon written
request and without charge a copy of the Indenture.  Requests may be made to:
BUILDING ONE SERVICES CORPORATION, 800 Connecticut Avenue, NW, Washington, DC
20006, Attention: Office of General Counsel.

                                     A-11
<PAGE>

                                ASSIGNMENT FORM


I or we assign and transfer this Security to

_______________________________________________________________________________

_______________________________________________________________________________
(Print or type name, address and zip code of assignee or transferee)

_______________________________________________________________________________
(Insert Social Security or other identifying number of assignee or transferee)

and irrevocably appoint _______________________________________ agent to
transfer this Security on the books of the Company.  The agent may substitute
another to act for him.

Dated: _________________                    Signed:  _________________________
                                                     (Sign exactly as name
                                                     appears on the other
                                                     side of this Security)

Signature Guarantee:                     ______________________________________
                                         Participant in a recognized Signature
                                         Guarantee Medallion Program (or other
                                         signature guarantor program reasonably
                                         acceptable to the Trustee)

          In connection with any transfer of this Security occurring prior to
the date which is the earlier of (i) the date of the declaration by the
Commission of the effectiveness of a registration statement under the Securities
Act of 1933, as amended (the "Securities Act") covering resales of this Security
(which effectiveness shall not have been suspended or terminated at the date of
the transfer) and (ii) April 30, 2001 the undersigned confirms that it has not
utilized any general solicitation or general advertising in connection with the
transfer:

                                                      [Check One]
                                                       ---------
<PAGE>

(1) ___   to the Company or a subsidiary thereof; or

(2) ___   pursuant to and in compliance with Rule 144A under the Securities Act
          of 1933, as amended; or

(3) ___   to an institutional "accredited investor" (as defined in Rule
          501(a)(1), (2), (3) or (7) under the Securities Act of 1933, as
          amended) that has furnished to the Trustee a signed letter containing
          certain representations and agreements (the form of which letter can
          be obtained from the Trustee); or

(4) ___   outside the United States to a "foreign purchaser" in compliance with
          Rule 904 of Regulation S under the Securities Act of 1933, as amended;
          or

(5) ___   pursuant to the exemption from registration provided by Rule 144 under
          the Securities Act of 1933, as amended; or

(6) ___   pursuant to an effective registration statement under the Securities
          Act of 1933, as amended; or

(7) ___   pursuant to another available exemption from the registration
          statement requirements of the Securities Act of 1933, as amended.

and unless the box below is checked, the undersigned confirms that such Security
is not being transferred to an "affiliate" of the Company as defined in Rule 144
under the Securities Act of 1933, as amended (an "Affiliate"):

               The transferee is an Affiliate of the Company.

          Unless one of the items is checked, the Trustee will refuse to
register any of the Securities evidenced by this certificate in the name of any
person other than the registered Holder thereof; provided, however, that if item
                                                 --------  -------
(3), (4), (5) or (7) is checked, the Company or the Trustee may require, prior
to registering any such transfer of the Securities, in their sole discretion,
such written legal opinions, certifications (including an investment letter in
the case of box (3) or (4) and other information as the Trustee or the Company
have

                                      -2-
<PAGE>

reasonably requested to confirm that such transfer is being made pursuant to an
exemption from, or in a transaction not subject to, the registration
requirements of the Securities Act of 1933, as amended.

          If none of the foregoing items are checked, the Trustee or Registrar
shall not be obligated to register this Security in the name of any person other
than the Holder hereof unless and until the conditions to any such transfer of
registration set forth herein and in Section 2.16 of the Indenture shall have
been satisfied.

Dated:_______________                     Signed:______________________________
                                                 (Sign exactly as name appears
                                                 on the other side of this
                                                 Security)

Signature Guarantee:___________________________________________________________


TO BE COMPLETED BY PURCHASER IF (2) ABOVE IS CHECKED

          The undersigned represents and warrants that it is purchasing this
Security for its own account or an account with respect to which it exercises
sole investment discretion and that it and any such account is a "qualified
institutional buyer" within the meaning of Rule 144A under the Securities Act of
1933, as amended, and is aware that the sale to it is being made in reliance on
Rule 144A and acknowledges that it has received such information regarding the
Company as the undersigned has requested pursuant to Rule 144A or has determined
not to request such information and that it is aware that the transferor is
relying upon the undersigned's foregoing representations in order to claim the
exemption from registration provided by Rule 144A.

Dated:_______________                            ______________________________
                                                 NOTICE: To be executed by an
                                                         executive officer

                                      -3-
<PAGE>

                       OPTION OF HOLDER TO ELECT PURCHASE

          If you want to elect to have this Security purchased by the Company
pursuant to Section 4.15 or Section 4.16 of the Indenture, check the appropriate
box:

Section 4.15 [      ] Section 4.16 [       ]

          If you want to elect to have only part of this Security purchased by
the Company pursuant to Section 4.15 or Section 4.16 of the Indenture, state the
amount:  $___________


Dated: _________________                  Signed:  ____________________________
                                                   (Sign exactly as name
                                                   appears on the other
                                                   side of this Security)

Signature Guarantee:                 ___________________________________________
                                     Participant in a recognized Signature
                                     Guarantee Medallion Program (or other
                                     signature guarantor program reasonably
                                     acceptable to the Trustee)
<PAGE>

                                                                       EXHIBIT B
                                                                       ---------
                                FORM OF LEGENDS

          Each Global Note and Physical Note that constitutes a Restricted
Security or is sold in compliance with Regulation S shall bear the following
legend (the "Private Placement Legend") on the face thereof until after the
             ------------------------
second anniversary of the Issue Date, unless otherwise agreed by the Issuer and
the Holder thereof:

          THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF
1933, AS AMENDED (THE "SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR
SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S.
PERSONS EXCEPT AS SET FORTH BELOW.  BY ITS ACQUISITION HEREOF, THE HOLDER (1)
REPRESENTS THAT (A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE
144A UNDER THE SECURITIES ACT) OR (B) IT IS NOT A U.S. PERSON AND IS ACQUIRING
THIS SECURITY IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE
SECURITIES ACT, (2) AGREES THAT IT WILL NOT WITHIN TWO YEARS AFTER THE ORIGINAL
ISSUANCE OF THIS SECURITY RESELL OR OTHERWISE TRANSFER THIS SECURITY EXCEPT (A)
TO THE COMPANY THEREOF OR ANY SUBSIDIARY THEREOF, (B) INSIDE THE UNITED STATES
TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE
SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN ACCREDITED INVESTOR (AS
DEFINED IN RULE 501(a)(1), (2), (3), OR (7) UNDER THE SECURITIES ACT (AN
"ACCREDITED INVESTOR") THAT, PRIOR TO SUCH TRANSFER, FURNISHES (OR HAS FURNISHED
ON ITS BEHALF BY A U.S. BROKER-DEALER) TO THE TRUSTEE A SIGNED LETTER CONTAINING
CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER
OF THIS SECURITY (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE FOR
THIS SECURITY), (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN
COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT (IF AVAILABLE), (E) PURSUANT
TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE SECURITIES ACT
(IF AVAILABLE), OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE
SECURITIES ACT AND (3) AGREES THAT IT WILL GIVE TO EACH PERSON TO WHOM THIS
SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND.  IN
CONNECTION WITH ANY TRANSFER OF THIS SECURITY WITHIN TWO YEARS

                                      B-1
<PAGE>

AFTER THE ORIGINAL ISSUANCE OF THIS SECURITY, IF THE PROPOSED TRANSFEREE IS AN
ACCREDITED INVESTOR, THE HOLDER MUST, PRIOR TO SUCH TRANSFER, FURNISH TO THE
TRUSTEE AND THE COMPANY SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION
AS EITHER OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING
MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN, THE TERMS
"OFFSHORE TRANSACTION," "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANING GIVEN
TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

          Each Global Security authenticated and delivered hereunder shall also
bear the following legend:

          THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
     HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A
     NOMINEE OF A DEPOSITORY OR A SUCCESSOR DEPOSITORY.  THIS SECURITY IS NOT
     EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN
     THE DEPOSITORY OR ITS NOMINEE EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED
     IN THE INDENTURE, AND NO TRANSFER OF THIS SECURITY (OTHER THAN A TRANSFER
     OF THIS SECURITY AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE
     DEPOSITORY OR BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER
     NOMINEE OF THE DEPOSITORY) MAY BE REGISTERED EXCEPT IN THE LIMITED
     CIRCUMSTANCES DESCRIBED IN THE INDENTURE.

          UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE
     OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE
     COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT,
     AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN
     SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND
     ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED
     BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE
     HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS
     THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

          TRANSFERS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN
     WHOLE, BUT NOT IN PART, TO NOMINEES OF CEDE & CO. OR TO A SUCCESSOR THEREOF
     OR SUCH SUCCESSOR'S NOMINEE

                                      B-2
<PAGE>

     AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO
     TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION
     2.16 OF THE INDENTURE.

                                      B-3
<PAGE>

                                                                       EXHIBIT C
                                                                       ---------
                           Form of Certificate To Be
                          Delivered in Connection with
                   Transfers to Non-QIB Accredited Investors
                   -----------------------------------------

                                                         [             ], [    ]

[                        ]
[                        ]
[                        ]

Ladies and Gentlemen:

          In connection with our proposed purchase of 10 1/2% Senior
Subordinated Notes due 2009 (the "Notes") of BUILDING ONE SERVICES CORPORATION,
a Delaware corporation (the "Company"), we confirm that:

          1.   We have received a copy of the Offering Memorandum (the "Offering
Memorandum"), dated April 23, 1999, relating to the Securities and such other
information as we deem necessary in order to make our investment decision.  We
acknowledge that we have read and agreed to the matters stated in the section
entitled "Transfer Restrictions" of such Offering Memorandum, including the
restrictions on duplication and circulation of the Offering Memorandum.

          2.   We understand that any subsequent transfer of the Securities is
subject to certain restrictions and conditions set forth in the Indenture
relating to the Securities (the "Indenture") as described in the Offering
Memorandum and the undersigned agrees to be bound by, and not to resell, pledge
or otherwise transfer the Securities except in compliance with, such
restrictions and conditions and the Securities Act of 1933, as amended (the
"Securities Act"), and all applicable State securities laws.

          3.   We understand that the offer and sale of the Securities have not
been registered under the Securities Act, and that the Securities may not be
offered or sold except as permitted in the following sentence.  We agree, on our
own behalf

                                      C-1
<PAGE>

and on behalf of any accounts for which we are acting as hereinafter stated,
that if we should sell any Securities, we will do so only (i) to the Company or
any of its subsidiaries, (ii) inside the United States in accordance with Rule
144A under the Securities Act to a "qualified institutional buyer" (as defined
in Rule 144A under the Securities Act), (iii) inside the United States to an
institutional "accredited investor" (as defined below) that, prior to such
transfer, furnishes (or has furnished on its behalf by a U.S. broker-dealer) to
the Trustee (as defined in the Indenture) a signed letter containing certain
representations and agreements relating to the restrictions on transfer of the
Securities (the form of which letter can be obtained from the Trustee), (iv)
outside the United States in accordance with Rule 904 of Regulation S
promulgated under the Securities Act to non-U.S. persons, (v) pursuant to the
exemption from registration provided by Rule 144 under the Securities Act (if
available), or (vi) pursuant to an effective registration statement under the
Securities Act, and we further agree to provide to any person purchasing any of
the Securities from us a notice advising such purchaser that resales of the
Securities are restricted as stated herein.

          4.   We are not acquiring the Securities for or on behalf of, and will
not transfer the Securities to, any pension or welfare plan (as defined in
Section 3 of the Employee Retirement Income Security Act of 1974), except as
permitted in the section entitled "Transfer Restrictions" of the Offering
Memorandum.

          5.   We understand that, on any proposed resale of any Securities, we
will be required to furnish to the Trustee and the Company such certification,
legal opinions and other information as the Trustee and the Company may
reasonably require to confirm that the proposed sale complies with the foregoing
restrictions.  We further understand that the Securities purchased by us will
bear a legend to the foregoing effect.

          6.   We are an institutional "accredited investor" (as defined in Rule
501(a)(1), (2), (3) or (7) of Regulation D under the Securities Act) and have
such knowledge and experience in financial and business matters as to be capable
of evaluating the merits and risks of our investment in the Securities, and we
and any accounts for which we are acting are

                                      C-2
<PAGE>

each able to bear the economic risk of our or their investment, as the case may
be.

          7.   We are acquiring the Securities purchased by us for our account
or for one or more accounts (each of which is an institutional "accredited
investor") as to each of which we exercise sole investment discretion.

                                      C-3
<PAGE>

          You, the Company, the Trustee and others are entitled to rely upon
this letter and are irrevocably authorized to produce this letter or a copy
hereof to any interested party in any administrative or legal proceeding or
official inquiry with respect to the matters covered hereby.

                                            Very truly yours,

                                            [Name of Transferee]

                                            By:_____________________________
                                               Name:
                                               Title:

                                      C-4
<PAGE>

                                                                       EXHIBIT D
                                                                       ---------

                      Form of Certificate To Be Delivered
                          in Connection with Transfers
                            Pursuant to Regulation S
                         -----------------------------------

                                                           [           ], [    ]

[                  ]
[                  ]
[                  ]
[                  ]

           Re:  Building One Services Corporation (the
                "Company") 10 1/2% Senior Subordinated
                Notes due 2009 (the "Securities")
                --------------------------------------

Ladies and Gentlemen:

          In connection with our proposed sale of [$        ] aggregate
principal amount of the Securities, we confirm that such sale has been effected
pursuant to and in accordance with Regulation S under the U.S. Securities Act of
1933, as amended (the "Securities Act"), and, accordingly, we represent that:

          (1) the offer of the Securities was not made to a person in the United
     States;

          (2) either (a) at the time the buy offer was originated, the
     transferee was outside the United States or we and any person acting on our
     behalf reasonably believed that the transferee was outside the United
     States, or (b) the transaction was executed in, on or through the
     facilities of a designated off-shore securities market and neither we nor
     any person acting on our behalf knows that the transaction has been pre-
     arranged with a buyer in the United States;

          (3) no directed selling efforts have been made in the United States in
     contravention of the requirements of Rule 903(b) or Rule 904(b) of
     Regulation S, as applicable;

                                      D-1
<PAGE>

          (4) the transaction is not part of a plan or scheme to evade the
     registration requirements of the Securities Act; and

          (5) we have advised the transferee of the transfer restrictions
     applicable to the Securities.

          You, the Company and counsel for the Company are entitled to rely upon
this letter and are irrevocably authorized to produce this letter or a copy
hereof to any interested party in any administrative or legal proceedings or
official inquiry with respect to the matters covered hereby.  Terms used in this
certificate have the meanings set forth in Regulation S.

                                      Very truly yours,

                                      [Name of Transferor]

                                      By:____________________
                                         Authorized Signature

                                      D-2
<PAGE>

                                                                       EXHIBIT E
                                                                       ---------

                                   GUARANTEE
                                   ---------

          For value received, each of the undersigned hereby unconditionally
guarantees, as principal obligor and not only as a surety, to the Holder of this
Security the cash payments in United States dollars of principal of, premium, if
any, and interest on this Security in the amounts and at the times when due and
interest on the overdue principal, premium, if any, and interest, if any, of
this Security, if lawful, and the payment or performance of all other
obligations of the Company under the Indenture (as defined below) or the
Securities, to the Holder of this Security and the Trustee, all in accordance
with and subject to the terms and limitations of this Security, Article Eleven
of the Indenture and this Guarantee.  This Guarantee will become effective in
accordance with Article Eleven of the Indenture and its terms shall be evidenced
therein.  The validity and enforceability of any Guarantee shall not be affected
by the fact that it is not affixed to any particular Security.

          Capitalized terms used but not defined herein shall have the meanings
ascribed to them in the Indenture dated as of April 30, 1999, among Building One
Services Corporation, a Delaware corporation, as issuer (the "Company"), the
Guarantors named therein and IBJ Whitehall Bank & Trust Company, as trustee (the
"Trustee"), as amended or supplemented (the "Indenture").

          The obligations of the undersigned to the Holders of Securities and to
the Trustee pursuant to this Guarantee and the Indenture are expressly set forth
in Article Eleven of the Indenture and reference is hereby made to the Indenture
for the precise terms of the Guarantee and all of the other provisions of the
Indenture to which this Guarantee relates.

          This Guarantee is subordinated in right of payment, in the manner and
to the extent set forth in Article Twelve of the Indenture, to the prior payment
in full in cash or Cash Equivalents of all Guarantor Senior Debt of the
Guarantors,

                                      E-1
<PAGE>

whether outstanding on the date of the Indenture or thereafter created,
incurred, assumed or guaranteed.

          THIS GUARANTEE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH,
THE LAWS OF THE STATE OF NEW YORK WITHOUT GIVING EFFECT TO PRINCIPLES OF
CONFLICTS OF LAW.  The undersigned Guarantor hereby agrees to submit to the
jurisdiction of the courts of the State of New York in any action or proceeding
arising out of or relating to this Guarantee.

          This Guarantee is subject to release upon the terms set forth in the
Indenture.

                                      E-2
<PAGE>

          IN WITNESS WHEREOF, each Guarantor has caused its Guarantee to be duly
executed.

Date:  April 30, 1999

                              ADVENT ELECTRIC CO., INC.
                              AMERICAN AIR COMPANY, INC.
                              APPEARANCE MANAGEMENT SERVICES, INC.
                              BELTLINE MECHANICAL SERVICES, INC.
                              BOXBERGER, INC.
                              BRICK, INC.
                              BUILDING ONE MECHANICAL SERVICES, INC.
                              BUILDING ONE SERVICE SOLUTIONS, INC.
                              BUYR, INC.
                              CENTER SERVICES, INC.
                              CONSOLIDATED ELECTRICAL GROUP,  INC.
                              D/FW MECHANICAL SERVICES, INC.
                              FLOR-SHIN, INC.
                              GAMEWELL MECHANICAL, INC.
                              GARFIELD-INDECON ELECTRICAL SERVICES, INC.
                              G.S. GROUP, INC.
                              G.S. FINANCIAL, INC.
                              GULF STATES, INC.
                              G.S.I. OF CALIFORNIA, INC.
                              TESTRONICS, INC.
                              BRAZOSPORT MANAGEMENT, INC.
                              HUNT ELECTRIC, INC.
                              IVEY MECHANICAL COMPANY, INC.
                              BARNES IVEY MECHANICAL COMPANY, L.L.C.
                              LEXINGTON/IVEY MECHANICAL COMPANY, LLC
                              IVEY MECHANICAL SERVICES, L.L.C.
                              THE LEWIS COMPANIES, INC.
                              OIL CAPITAL ELECTRIC, INC.
                              ENGINEERING DESIGN GROUP, INC.

                                      E-3
<PAGE>

                              ELECTRICAL DESIGN & CONSTRUCTION, INC.
                              FRED CLARK ELECTRICAL CONTRACTOR, INC.
                              OMNI MECHANICAL COMPANY
                              OMNI MECHANICAL SERVICES
                              MCINTOSH MECHANICAL, INC.
                              NATIONAL NETWORK SERVICES, INC.
                              PERIMETER MAINTENANCE CORPORATION
                              POTTER ELECTRIC CO., INC.
                              REGENCY ELECTRIC COMPANY, INC.
                              REGENCY ELECTRIC COMPANY JACKSONVILLE OFFICE, INC.
                              REGENCY ELECTRIC COMPANY ORLANDO OFFICE, INC.
                              REGENCY ELECTRIC COMPANY ATLANTA OFFICE
                              REGENCY ELECTRIC COMPANY MEMPHIS OFFICE, INC.
                              REGENCY ELECTRIC COMPANY PROJECTS GROUP, INC.
                              REGENCY ELECTRIC COMPANY SOUTH FLORIDA, INC.
                              REGENCY ELECTRIC COMPANY CHARLOTTE OFFICE, INC.
                              RELIABLE PAPER SERVICE COMPANY, INC.
                              RIVIERA ELECTRIC CONSTRUCTION CO.
                              RIVIERA ELECTRIC OF CALIFORNIA, INC.
                              ROBINSON MECHANICAL COMPANY
                              SANDERS BROS., INC.
                              SKC ELECTRIC, INC.
                              CRAMAR ELECTRIC, INC.
                              SKCE, INC.
                              PRO WIRE SECURITY SYSTEMS, INC.
                              SPANN BUILDING MAINTENANCE COMPANY
                              SPANN MANAGEMENT GROUP, INC.
                              TAYLOR ELECTRIC, INC.
                              TESS HOLDINGS, INC.
                              CREST INTERNATIONAL, LLC
                              TOWN & COUNTRY ELECTRIC, INC.

                                      E-4
<PAGE>

                              TRI-CITY ELECTRICAL CONTRACTORS, INC.
                              TRI-M HOLDING CORP.
                              TRI-M CORPORATION
                              TRI-M ELECTRICAL CONSTRUCTION CORP.
                              TRI-M BUILDING AUTOMATION SYSTEMS CORP.
                              TRI-M INFORMATION SYSTEMS CORP.
                              TRI-M INTEGRATED SYSTEM SOLUTIONS CORP.
                              WALKER ENGINEERING, INC.
                              WARREN ELECTRICAL CONSTRUCTION CORP.
                              WATSON ELECTRICAL CONSTRUCTION CO.
                              WILSON ELECTRIC COMPANY, INC.
                              CHAMBERS ELECTRONIC COMMUNICATIONS, INC.

                              By:  ____________________________
                                   Name:
                                   Title:

                              IBJ WHITEHALL BANK & TRUST COMPANY,
                                as Trustee

                              By:  ____________________________
                                   Name:
                                   Title:

                                      E-5