Document:

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                                                                   Exhibit 10.15

                                   COACH, INC.
                        2001 EMPLOYEE STOCK PURCHASE PLAN

                                   ARTICLE I.
                  PURPOSE, SCOPE AND ADMINISTRATION OF THE PLAN

         1.1 Purpose and Scope. The purpose of the Coach, Inc. 2001 Employee
Stock Purchase Plan is to assist employees of Coach, Inc. and its subsidiaries
in acquiring a stock ownership interest in the Company pursuant to a plan which
is intended to qualify as an "employee stock purchase plan" under Section 423 of
the Internal Revenue Code of 1986, as amended.

         1.2 Administration of Plan. The Plan shall be administered by the
Committee. The Committee shall have the power to make, amend and repeal rules
and regulations for the interpretation and administration of the Plan consistent
with the qualification of the Plan under Section 423 of the Code, and the
Committee also is authorized to change the Option Periods, Offering Dates and
Exercise Dates under the Plan by providing written notice to all Employees at
least 15 days prior to the date following which such changes will take effect.
The Committee may delegate administrative tasks under the Plan to one or more
Officers of the Company. The Committee's interpretation and decisions in respect
to the Plan shall be final and conclusive.

                                   ARTICLE II.
                                   DEFINITIONS

         Whenever the following terms are used in this Plan, they shall have the
meaning specified below unless the context clearly indicates to the contrary.
The singular pronoun shall include the plural where the context so indicates.

         2.1 "Board" shall mean the Board of Directors of the Company.

         2.2 "Code" shall mean the Internal Revenue Code of 1986, as amended.

         2.3 "Committee" shall mean the Compensation and Employee Benefits
Committee of the Board, which Committee shall administer the Plan as provided in
Section 1.2 above.

         2.4 "Common Stock" shall mean shares of common stock of the Company,
par value $0.01 per share.

         2.5 "Company" shall mean Coach, Inc., a Maryland corporation.

         2.6 "Compensation" shall mean the base salary or wages and targeted
commissions paid to an Employee by the Company or a Subsidiary in accordance
with established payroll procedures.

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         2.7 "Eligible Employee" shall mean an Employee who (a) is customarily
scheduled to work at least 20 hours per week, and (b) whose customary employment
is more than five (5) months in a calendar year.

         2.8 "Employee" shall mean any employee of the Company or a Subsidiary.

         2.9 "Exercise Date" shall mean each May 31 and November 30.

         2.10 "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended.

         2.11 "Fair Market Value" of a share of Common Stock as of a given date
shall mean (a) the closing price of a share of Common Stock on the principal
exchange on which shares of Common Stock are then trading, if any (or as
reported on any composite index which includes such principal exchange), on the
trading day previous to such date, or if shares were not traded on the trading
day previous to such date, then on the next preceding date on which a trade
occurred, or (b) if Common Stock is not traded on an exchange but is quoted on
Nasdaq or a successor quotation system, the mean between the closing
representative bid and asked prices for the Common Stock on the trading day
previous to such date as reported by Nasdaq or such successor quotation system,
or (c) if Common Stock is not publicly traded on an exchange and not quoted on
Nasdaq or a successor quotation system, the Fair Market Value of a share of
Common Stock as established by the Committee acting in good faith.

         2.12 "Offering Date" shall mean each December 1 and June 1. The first
Offering Date under the Plan shall be February 8, 2002.

         2.13 "Officer" shall mean an employee of the Company who is either an
executive officer or member of the management of the Company.

         2.14 "Option Period" shall mean the period beginning on an Offering
Date and ending on the next succeeding Exercise Date.

         2.15 "Option Price" shall mean the purchase price of a share of Common
Stock hereunder as provided in Section 4.1 below.

         2.16 "Participant" shall mean any Eligible Employee who elects to
participate pursuant to the terms of the Plan.

         2.17 "Plan" shall mean this Coach, Inc. 2001 Employee Stock Purchase
Plan, as it may be amended from time to time.

         2.18 "Plan Account" shall mean a bookkeeping account established and
maintained by the Company in the name of each Participant.

         2.19 "Subsidiary" shall mean any corporation of which the Company or a
Subsidiary owns stock possessing 50% or more of the total combined voting power
of all classes of stock in the corporation.

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                                  ARTICLE III.
                                  PARTICIPATION

         3.1 Eligibility. An Eligible Employee may participate in the Plan if
immediately after the applicable Offering Date, that Employee would not be
deemed for purposes of Section 423(b)(3) of the Code to possess 5% or more of
the total combined voting power or value of all classes of stock of the Company
or any Subsidiary.

         3.2 Election to Participate; Payroll Deductions

            (a) Except as otherwise provided in Section 3.3, an Eligible
Employee may participate in the Plan only by means of payroll deduction. An
Eligible Employee may elect to participate in the Plan during an Option Period
by delivering to the Company in the calendar month preceding the Offering Date
on which such Option Period commences a written payroll deduction authorization
on a form prescribed by the Company.

            (b) Payroll deductions (i) must equal at least five dollars ($5.00)
per pay period; and (ii) may be expressed either as (A) a whole number
percentage, or (B) a fixed dollar amount, subject to the provisions of Sections
4.2 and 4.3 below. Amounts deducted from a Participant's Compensation pursuant
to this Section 3.2 shall be credited to the Participant's Plan Account.

            (c) A Participant may, on one occasion only during an Option Period,
increase or decrease the amount of his or her payroll deductions with respect to
that Option Period by completing and filing with the Company a new written
payroll deduction authorization form authorizing the change in the payroll
deduction rate. The change in rate shall be effective as of the beginning of the
next payroll period following the date of the filing of the new Enrollment
Documents, or, if this is impracticable for administrative reasons in the
Company's reasonable judgment, as of the beginning of the next succeeding
payroll period.

         3.3 Leave of Absence. During leaves of absence approved by the Company
meeting the requirements of Regulation Section 1.421-7(h)(2) under the Code, a
Participant may continue participation in the Plan by making cash payments to
the Company on his or her normal payday equal to his or her authorized payroll
deduction.

                                  ARTICLE IV.
                               PURCHASE OF SHARES

         4.1 Option Price. The Option Price per share of the Common Stock sold
to Participants hereunder shall be 85% of the Fair Market Value of such share on
either the Offering Date or the Exercise Date of the Option Period, whichever is
lower, but in no event shall the Option Price per share be less than the par
value per share ($0.01) of the Common Stock.

         4.2 Purchase of Shares

            (a) On each Exercise Date on which he or she is employed, each
Participant will automatically and without any action on his or her part be
deemed to have exercised his or her option to purchase at the Option Price the
largest number of whole shares of

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Common Stock which can be purchased with the amount in the Participant's Plan
Account. The balance, if any, remaining in the Participant's Plan Account (after
exercise of his or her option) as of an Exercise Date shall be carried forward
to the next Option Period, unless the Participant has elected to withdraw from
the Plan pursuant to Section 6.1 below.

            (b) As soon as practicable following each Exercise Date, the number
of shares purchased by such Participant pursuant to subsection (a) above will be
delivered, in the Company's sole discretion, to either (i) the Participant, or
(ii) an account established in the Participant's name at a stock brokerage or
other financial services firm designated by the Company. In the event the
Company is required to obtain from any commission or agency authority to issue
any such shares of Common Stock, the Company will seek to obtain such authority.
Inability of the Company to obtain from any such commission or agency authority
which counsel for the Company deems necessary for the lawful issuance of any
such shares shall relieve the Company from liability to any Participant except
to refund to him or her the amount withheld.

         4.3 Limitations on Purchase. No Employee shall be granted an option
under the Plan which permits his or her rights to purchase Common Stock under
the Plan or any other employee stock purchase plan of the Company or any of its
Subsidiaries to accrue at a rate which exceeds $25,000 (as measured by the Fair
Market Value of such Common Stock at the time the option is granted, i.e., the
Offering Date) for each calendar year such option is outstanding. For purposes
of this Section 4.3, the right to purchase Common Stock under an option accrues
when the option (or any portion thereof) becomes exercisable, and the right to
purchase Common Stock which has accrued under one option under the Plan may not
be carried over to any other option.

         4.4 Transferability of Rights. An option granted under the Plan shall
not be transferable and is exercisable only by the Participant. No option or
interest or right to the option shall be available to pay off any debts,
contracts or engagements of the Participant or his or her successors in interest
or shall be subject to disposition by pledge, encumbrance, assignment or any
other means whether such disposition be voluntary or involuntary or by operation
of law by judgment, levy, attachment, garnishment or any other legal or
equitable proceedings (including bankruptcy), and any attempt at disposition of
the option shall have no effect.

                                   ARTICLE V.
                       PROVISIONS RELATING TO COMMON STOCK

         5.1 Common Stock Reserved. Subject to adjustment as provided in Section
5.2, the maximum number of shares of Common Stock that shall be made available
for sale under this Plan shall be 300,000. Shares of Common Stock made available
for sale under this Plan may be authorized but unissued or reacquired shares
reserved for issuance under this Plan.

         5.2 Adjustment for Changes in Common Stock. In the event that
adjustments are made in the number of outstanding shares of Common Stock or the
shares are exchanged for a different class of stock of the Company by reason of
stock dividend, stock split or other subdivision, the Committee shall make
appropriate adjustments in (a) the number and class of shares or other
securities that may be reserved for purchase hereunder, and (b) the Option Price
of outstanding options.

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         5.3 Merger, Acquisition or Liquidation. In the event of the merger or
consolidation of the Company into another corporation, the acquisition by
another corporation of all or substantially all of the Company's assets or 80%
or more of the Company's then outstanding voting stock or the liquidation or
dissolution of the Company, the date of exercise with respect to outstanding
options shall be the business day immediately preceding the effective date of
such merger, consolidation, acquisition, liquidation or dissolution unless the
Committee shall, in its sole discretion, provide for the assumption or
substitution of such options in a manner complying with Section 424(a) of the
Code.

         5.4 Insufficient Shares. If the aggregate funds available for the
purchase of Common Stock on any Exercise Date would cause an issuance of shares
in excess of the number provided for in Section 5.1 above, (a) the Committee
shall proportionately reduce the number of shares that would otherwise be
purchased by each Participant in order to eliminate such excess, and (b) the
Plan shall automatically terminate immediately after such Exercise Date.

         5.5 Rights as Stockholders. With respect to shares of Common Stock
subject to an option, a Participant shall not be deemed to be a stockholder and
shall not have any of the rights or privileges of a stockholder. A Participant
shall have the rights and privileges of a stockholder when, but not until, a
certificate has been issued to him or her following exercise of his or her
option.

                                  ARTICLE VI.
                          TERMINATION OF PARTICIPATION

         6.1 Cessation of Contributions; Voluntary Withdrawal

            (a) A Participant may cease payroll deductions during an Option
Period by delivering notice of such cessation to the Company. Upon any such
cessation, the Participant may elect either to withdraw from the Plan pursuant
to subsection (b) below or to have amounts credited to his or her Plan Account
held in the Plan for the purchase of Common Stock pursuant to Section 4.2. A
Participant who ceases contributions to the Plan during any Option Period shall
not be permitted to resume contributions to the Plan during that Option Period.

            (b) A Participant may withdraw from the Plan at any time by notice
to the Secretary of the Company prior to the close of business on an Exercise
Date. Within 21 days after the notice of withdrawal is delivered, the Company
shall refund the entire amount, if any, in a Participant's Plan Account to him
or her, at which time the Participant's payroll deduction authorization, his or
her interest in the Plan and his or her option under the Plan shall terminate.
Any Eligible Employee who withdraws from the Plan may again become a Participant
in accordance with Section 3.2 above.

         6.2 Termination of Eligibility

            (a) If a Participant ceases to be eligible under Section 3.1 above
for any reason, the amount in such Participant's Plan Account will be refunded
to the Participant or

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his or her designated beneficiary or estate within 21 days of his or her
termination of employment or other cessation of eligibility.

            (b) Upon payment by the Company to the Participant or his or her
beneficiary or estate of the remaining balance, if any, in Participant's Plan
Account, the Participant's interest in the Plan and the Participant's option
under the Plan shall terminate.

                                  ARTICLE VII.
                               GENERAL PROVISIONS

         7.1 Condition of Employment. Neither the creation of the Plan nor an
Employee's participation therein shall be deemed to create a contract of
employment, any right of continued employment or in any way affect the right of
the Company or a Subsidiary to terminate an Employee at any time with or without
cause.

         7.2 Amendment of the Plan

            (a) The Board may, in its sole discretion, amend, suspend or
terminate the Plan at any time and from time to time; provided, however, that
without approval of the Company's stockholders given within 12 months before or
after action by the Board, the Plan may not be amended to increase the maximum
number of shares subject to the Plan or change the designation or class of
Eligible Employees.

            (b) Upon termination of the Plan, the balance in each Participant's
Plan Account shall be refunded within 21 days of such termination.

         7.3 Use of Funds; No Interest Paid. All funds received by the Company
by reason of purchase of Common Stock under this Plan will be included in the
general funds of the Company free of any trust or other restriction and may be
used for any corporate purpose. No interest will be paid to any Participant or
credited under the Plan.

         7.4 Effective Date; Term; Approval by Stockholders. The Plan shall
become effective as of the first date that both (a) the Board has approved the
Plan and (b) the stockholders of the Company have approved the Plan by a vote
sufficient to meet the requirements of Section 423(b)(2) of the Code; provided
that such stockholder approval occurs within 12 months following the date the
Board approves the Plan. Options may be granted prior to such stockholder
approval; provided, however, that such options may not be exercisable prior to
the date the Plan is approved by the Company's stockholders. In the event that
the stockholders fail to so approve the Plan, any options granted under the Plan
may be cancelled, all payroll deductions shall be cancelled and the Plan shall
be terminated. Except as otherwise provided by this Section 7.4, the Plan shall
terminate on the tenth anniversary of the date of its initial approval by the
stockholders of the Company or such earlier date as may be established by action
of the Board. No option may be granted during any period of suspension of the
Plan nor after termination of the Plan.

         7.5 Effect Upon Other Plans. The adoption of the Plan shall not affect
any other compensation or incentive plans in effect for the Company or any
Subsidiary. Nothing in

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this Plan shall be construed to limit the right of the Company or any Subsidiary
(a) to establish any other forms of incentives or compensation for employees of
the Company or any Subsidiary, or (b) to grant or assume options otherwise than
under this Plan in connection with any proper corporate purpose, including, but
not by way of limitation, the grant or assumption of options in connection with
the acquisition, by purchase, lease, merger, consolidation or otherwise, of the
business, stock or assets of any corporation, firm or association.

         7.6 Conformity to Securities Laws. Notwithstanding any other provision
of this Plan, this Plan and the participation in this Plan by any individual who
is then subject to Section 16 of the Exchange Act shall be subject to any
additional limitations set forth in any applicable exemptive rule under Section
16 of the Exchange Act (including any amendment to Rule 16b-3 of the Exchange
Act) that are requirements for the application of such exemptive rule. To the
extent permitted by applicable law, the Plan shall be deemed amended to the
extent necessary to conform to such applicable exemptive rule.

         7.7 Notice of Disposition of Shares. The Company may require any
Participant to give the Company prompt notice of any disposition of shares of
Common Stock, acquired pursuant to the Plan, within two years after the
applicable Offering Date or within one year after the applicable Exercise Date
with respect to such shares. The Company may direct that the certificates
evidencing shares acquired pursuant to the Plan refer to such requirement.

         7.8 Tax Withholding. The Company shall be entitled to require payment
in cash or deduction from other compensation payable to each Participant of any
sums required by federal, state or local tax law to be withheld with respect to
any purchase of shares of Common Stock under the Plan or any sale of such
shares.

         7.9 Governing Law. The Plan and all rights and obligations thereunder
shall be construed and enforced in accordance with the laws of the State of
Maryland.

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         I hereby certify that the foregoing Coach, Inc. 2001 Employee Stock
Purchase Plan was duly approved by the Board of Directors of Coach, Inc. on
September 4, 2001.

         I hereby certify that the foregoing Coach, Inc. 2001 Employee Stock
Purchase Plan was duly approved by the stockholders of Coach, Inc. on November
7, 2001.

         Executed on this 3rd day of December, 2001.

                                                     /s/ Carole P. Sadler
                                                     --------------------
                                                             Secretary

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                                                                    EXHIBIT 4(a)

                          FOURTH SUPPLEMENTAL INDENTURE

                         Dated as of September 19, 2002

                                     between

                               SEMCO ENERGY, INC.,

                                    AS ISSUER

                                       and

                  BANK ONE TRUST COMPANY, NATIONAL ASSOCIATION,

                                   AS TRUSTEE

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                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                                       <C>
ARTICLE I DEFINITIONS.......................................................................................1

         Section 1.1       Definition of Terms..............................................................1

ARTICLE II ISSUE, EXECUTION, FORM AND REGISTRATION OF
SECURITIES..................................................................................................2

         Section 2.1         Authentication and Delivery of Securities......................................2
         Section 2.2         Execution of Securities........................................................2
         Section 2.3         Certificate of Authentication..................................................2
         Section 2.4         Form, Denomination and Date of Securities......................................2
         Section 2.5         Global Securities..............................................................5

ARTICLE III TERMS OF THE SECURITIES.........................................................................6

         Section 3.1         Terms of the Securities........................................................6
         Section 3.2         Form of the Securities........................................................10

ARTICLE IV MISCELLANEOUS...................................................................................10

         Section 4.1         Ratification of Indenture.....................................................10
         Section 4.2         Trustee Not Responsible for Recitals..........................................10
         Section 4.3         Governing Law.................................................................10
         Section 4.4         Separability..................................................................10
         Section 4.5         Counterparts..................................................................10

</TABLE>

<PAGE>
         FOURTH SUPPLEMENTAL INDENTURE, dated as of September 19, 2002 (the
"Fourth Supplemental Indenture"), between SEMCO Energy, Inc., a corporation duly
organized and existing under the laws of the State of Michigan (the "Company"),
and Bank One Trust Company, National Association, a national banking
association, as trustee (the "Trustee").

         WHEREAS, the Company executed and delivered the indenture, dated as of
October 23, 1998 (the "Base Indenture"), to NBD Bank, as predecessor trustee to
the Trustee, to provide for the future issuance of the Company's debentures,
notes, bonds or other evidences of indebtedness, to be issued from time to time
in one or more series as may be determined by the Company under the Base
Indenture; and

         WHEREAS, the Company entered into a First Supplemental Indenture dated
as of June 16, 2000, a Second Supplemental Indenture dated as of June 29, 2000,
and a Third Supplemental Indenture dated as of June 15, 2001, to the Base
Indenture; and

         WHEREAS, pursuant to the terms of the Base Indenture, the Company
desires to provide for the establishment of a new series of its securities to be
known as its 6.49% Senior Notes Due 2009 (the "6.49% Senior Notes Due 2009" or
the "Securities"), the form and substance of the Securities and the terms,
provisions and conditions thereof to be set forth as provided in the Base
Indenture as heretofore supplemented and as further supplemented by this Fourth
Supplemental Indenture (together, the "Indenture"); and

         WHEREAS, the Company has requested that the Trustee execute and deliver
this Fourth Supplemental Indenture and all requirements necessary to make this
Fourth Supplemental Indenture a valid instrument in accordance with its terms,
and to make the Securities, when executed by the Company and authenticated and
delivered by the Trustee, the valid obligations of the Company and all acts and
things necessary have been done and performed to make this Fourth Supplemental
Indenture enforceable in accordance with its terms, and the execution and
delivery of this Fourth Supplemental Indenture has been duly authorized in all
respects.

         NOW THEREFORE, in consideration of the purchase and acceptance of the
Securities by the Holders thereof, and for the purpose of setting forth, as
provided in the Indenture, the form and substance of the Securities and the
terms, provisions and conditions thereof, the Company covenants and agrees with
the Trustee as follows:

                                    ARTICLE I
                                   DEFINITIONS

SECTION 1.1.               Definition of Terms.

         Unless the context otherwise requires, a term defined in the Indenture
has the same meaning when used in this Fourth Supplemental Indenture.

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                                   ARTICLE II
              ISSUE, EXECUTION, FORM AND REGISTRATION OF SECURITIES

SECTION 2.1                AUTHENTICATION AND DELIVERY OF SECURITIES.

         Upon the execution and delivery of this Fourth Supplemental Indenture,
or from time to time thereafter, Securities in an aggregate principal amount not
in excess of $30,000,000 (or such higher amount as may be authorized by a
resolution of the Board of Directors of the Company or a committee thereof) may
be executed by the Company and delivered to the Trustee for authentication, and
the Trustee shall thereupon authenticate and deliver said Securities to or upon
the written order of the Company, signed by both (a) its Chairman of the Board
of Directors, or its President or any Vice President and (b) by its Chief
Financial Officer, or its Secretary or any Assistant Secretary, or its Treasurer
or any Assistant Treasurer without any further action by the Company. The
Securities shall be direct, unconditional obligations of the Company and shall
rank pari passu without preference among themselves and equally in priority of
payment with all other present and future unsecured senior indebtedness of the
Company.

SECTION 2.2                EXECUTION OF SECURITIES.

         The Securities shall be (a) signed on behalf of the Company by its
Chairman of the Board of Directors or its President or any Vice President and
(b) attested by its Secretary or its Assistant Secretary under its corporate
seal. Such signatures may be the manual or facsimile signatures of the present
or any future such officers. The seal of the Company may be in the form of a
facsimile thereof and may be impressed, affixed, imprinted or otherwise
reproduced on the Securities. Typographical and other minor errors or defects in
any such reproduction of the seal or any such signature shall not affect the
validity or enforceability of any Security that has been duly authenticated and
delivered by the Trustee.

SECTION 2.3                CERTIFICATE OF AUTHENTICATION.

         Only such Securities as shall bear thereon a certificate of
authentication substantially in the form recited in the form of Security
attached as Exhibit A hereto, executed by the Trustee by manual signature of one
of its authorized signatories, shall be entitled to the benefits of this
Indenture or be valid or obligatory for any purpose. Such certificate by the
Trustee upon any Security executed by the Company shall be conclusive evidence
that the Security so authenticated has been duly authenticated and delivered
hereunder and that the Holder is entitled to the benefits of this Indenture.

SECTION 2.4                FORM, DENOMINATION AND DATE OF SECURITIES.

         (a) The Securities and the Trustee's certificate of authentication
shall be substantially in the form set forth in the form of Security attached as
Exhibit A hereto. The Securities shall be numbered, lettered, or otherwise
distinguished in such manner or in accordance with such plans as the officers of
the Company executing the same may determine with the approval of the Trustee.

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         Any of the Securities may be issued with appropriate insertions,
omissions, substitutions and variations and may have imprinted or otherwise
reproduced thereon such legend or legends, not inconsistent with the provisions
of this Indenture, as may be required to comply with any law or with any rules
or regulations pursuant thereto, or with the rules of any securities market in
which the Securities are admitted to trading, or to conform to general usage.

         (b) (i) This Section 2.4(b)(i) shall apply only to Securities in global
form ("Global Securities") deposited with The Depository Trust Company (the
"U.S. Depositary").

         The Company shall execute and the Trustee shall, in accordance with
this Section 2.4(b)(i), authenticate and deliver initially Global Securities
that (a) shall be registered in the name of the U.S. Depositary for such Global
Securities or the nominee of such U.S. Depositary, (b) shall be deposited on
behalf of Agent Members (as defined herein) with the Trustee as custodian for
the U.S. Depositary and (c) shall bear legends substantially to the following
effect:

         "UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE
         OF [INSERT NAME OF U.S. DEPOSITARY] TO THE COMPANY OR ITS AGENT FOR
         REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
         ISSUED IN EXCHANGE FOR THIS CERTIFICATE OR ANY PORTION HEREOF IS
         REGISTERED IN THE NAME OF [INSERT NAME OF U.S. NOMINEE OF DEPOSITARY],
         OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE
         OF [INSERT NAME OF U.S. DEPOSITARY] (AND ANY PAYMENT HEREON IS MADE TO
         [INSERT NAME OF NOMINEE OF U.S. DEPOSITARY]), OR TO SUCH OTHER ENTITY
         AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF [INSERT NAME OF U.S.
         DEPOSITARY], ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
         OTHERWISE BY OR TO ANY PERSON OTHER THAN (INSERT NAME OF U.S.
         DEPOSITARY OR A NOMINEE THEREOF] IS WRONGFUL INASMUCH AS THE REGISTERED
         OWNER HEREOF, [INSERT NAME OF NOMINEE OF U.S. DEPOSITARY] HAS AN
         INTEREST HEREIN".

         "TRANSFERS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN
         WHOLE, BUT NOT IN PART, TO NOMINEES OF [INSERT NAME OF U.S. DEPOSITARY]
         OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR'S NOMINEE AND TRANSFERS OF
         PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN
         ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION 305 OF THE
         INDENTURE REFERRED TO ON THE REVERSE HEREOF".

         Members of, or participants in, a U.S. Depositary ("Agent Members")
shall have no rights under the Indenture with respect to any Global Security
held on their behalf by the U.S. Depositary or under any Global Security, and
the U.S. Depositary may be treated by the Company, the Trustee, and any agent of
the Company or the Trustee as the absolute owner of such 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

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effect to any written certification, proxy or other authorization furnished by
the U.S. Depositary or impair, as between the U.S. Depositary and its Agent
Members, the operation of customary practices governing the exercise of the
rights of a holder of any security.

         (ii) This Section 2.4(b)(ii) shall apply only to the Global Security
deposited on behalf of the purchasers of the Securities represented thereby with
the Trustee as custodian for the U.S. Depositary for credit to their respective
accounts (or to such other accounts as they may direct) at Euroclear System
("Euroclear") or Cedel, S.A. ("Cedel") insofar as interests in the Global
Security are held by the Agent Members for Euroclear or Cedel.

         The provisions of the "Operating Procedures of the Euroclear System"
and the "Terms and Conditions Governing Use of Euroclear" and the "Management
Regulations" and "Instructions to Participants" of Cedel, respectively, shall be
applicable to such Global Security insofar as interests therein are held by the
Agent Members for Euroclear and Cedel. Account holders or participants in
Euroclear and Cedel shall have no rights under this Indenture with respect to
the Global Security, and the nominee of the U.S. Depositary may be treated by
the Company and the Trustee and any agent of the Company or the Trustee as the
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 U.S. Depositary or impair, as
between the U.S. Depositary and its Agent Members, the operation of customary
practices governing the exercise of the rights of a holder of any security.

         (c) Each Security shall be dated the date of its authentication and
shall bear interest from the applicable date, and shall be payable on the dates
specified, on the face of the form of Security attached as Exhibit A hereto.

         (d) The Person in whose name any Security is registered at the close of
business on the record date specified in the Securities with respect to any
Interest Payment Date shall be entitled to receive the interest, if any, payable
on such Interest Payment Date notwithstanding any transfer or exchange of such
security subsequent to the record date and prior to such Interest Payment Date,
except if and to the extent the Company shall default in the payment of the
interest due on such Interest Payment Date, in which case such defaulted
interest shall be paid to the Persons in whose names Outstanding Securities are
registered at the close of business on a subsequent special record date, to be
established (together with the related payment date) by the Trustee. Such
special record date shall not be more than 15 nor less than 10 days prior to the
payment date. Not less than 10 days prior to the special record date, the
Company (or the Trustee, in the name of and at the expense of the Company) shall
mail to Holders a notice that states the special record date, the related
payment date and the amount of interest to be paid. Notice of the proposed
payment of such defaulted interest and the special record date therefor having
been mailed as aforesaid, such defaulted interest shall be paid to the Persons
in whose names the Securities are registered on such special record date.

         (e) The Securities shall be issuable in the denominations specified in
the form of Security attached as Exhibit A hereto.

                                       4
<PAGE>

SECTION 2.5                GLOBAL SECURITIES.

         (a) Portions of a Global Security deposited with the U.S. Depositary
pursuant to Section 2.4 shall be transferred in certificated form to the
beneficial owners thereof only if such transfer complies with Section 305 of the
Base Indenture and (i) the U.S. Depositary notifies the Company that it is
unwilling or unable to continue as U.S. Depositary for such Global Security or
if at any time such U.S. Depositary ceases to be a "clearing agency" registered
under the Exchange Act and a successor depositary is not appointed by the
Company within 90 days of such notice, (ii) the Company determines not to have
the Securities represented by a Global Security, or (iii) an Event of Default
has occurred and is continuing with respect to the Securities and the beneficial
owners of a majority in interest of Securities have advised the U.S. Depositary
to cease acting as depository for the Securities.

         (b) Portions of any Global Security that are transferable to the
beneficial owners thereof pursuant to this Section 2.5 shall be surrendered by
the U.S. Depositary to the Trustee at its New York office for registration of
transfer, in whole or from time to time in part, without charge and the Trustee
shall authenticate and deliver, upon such registration of transfer of each
portion of such Global Security, an equal aggregate principal amount of
Securities of authorized denominations. Any portion of a Global Security whose
registration is transferred pursuant to this Section 2.5 shall be executed,
authenticated and delivered only in the denominations specified in the form of
Security attached as Exhibit A hereto and registered in such names as the U.S.
Depositary shall direct.

         (c) Subject to the provisions of Section 2.4(b) above, the registered
Holder of any Global Security may grant proxies and otherwise authorize any
person, including Agent Members and persons that may hold interests through
Agent Members, to take any action which a Holder is entitled to take under this
Indenture or the Securities.

         (d) In the event of the occurrence of any of the events specified in
paragraph (a) of this Section 2.5, the Company shall promptly make available to
the Trustee a reasonable supply of certificated Securities in definitive, fully
registered form without interest coupons.

                                       5
<PAGE>

                                   ARTICLE III

                                      TERMS

SECTION 3.1                TERMS OF THE SECURITIES.

The Securities shall contain the following terms and conditions:

TITLE OF SECURITIES:

         6.49% Senior Notes Due 2009

AGGREGATE PRINCIPAL AMOUNT:

         $30,000,000

MATURITY:

         October 1, 2009

INTEREST RATE:

         6.49% per annum

DATE FROM WHICH INTEREST ACCRUES:

         September 19, 2002, or the most recent Interest Payment Date to which
interest has been paid or duly provided for.

INTEREST PAYMENT DATES:

         Semiannually on each April 1 and October 1 commencing April 1, 2003 and
at maturity. In the event that any date on which interest is payable is not a
Business Day (as defined in the Indenture), then payment of the interest payable
on such date will be made on the next succeeding day which is a Business Day
without any interest or other payment in respect of any such delay.

REGULAR RECORD DATE:

         Payments of interest and principal shall be made to the person in whose
name a 6.49% Senior Note Due 2009 is registered at the close of business on the
fifteenth calendar day, whether or not a Business Day, prior to the payment
date.

                                       6
<PAGE>

PLACE OF PAYMENT

         Any designated office of the Trustee, including any such office located
in the Borough of Manhattan.

SINKING FUND PROVISIONS:

         None

FORM:

         One or more permanent global notes in definitive, fully registered,
book-entry form, without coupons.

DEPOSITARY:

         The Depository Trust Company.

DEFEASANCE:

         The provisions of Sections 1402 and 1403 of the Indenture shall be
applicable to the 6.49% Senior Notes Due 2009.

SECTION 3.2                FORM OF THE SECURITIES.

         The form of the 6.49% Senior Notes Due 2009 shall be the form set forth
in Exhibit A attached hereto.

                                   ARTICLE IV
                                  MISCELLANEOUS

SECTION 4.1.               Ratification of Indenture.

         The Indenture as supplemented by this Fourth Supplemental Indenture, is
in all respects ratified and confirmed, and this Fourth Supplemental Indenture
shall be deemed part of the Indenture in the manner and to the extent herein and
therein provided.

SECTION 4.2.               Trustee Not Responsible for Recitals.

         The recitals herein contained are made by the Company and not by the
Trustee, and the Trustee assumes no responsibility for the correctness thereof.
The Trustee makes no representation as to the validity or sufficiency of this
Fourth Supplemental Indenture.

                                       7
<PAGE>

SECTION 4.3.                Governing Law.

         This Fourth Supplemental Indenture and each Security shall be deemed to
be a contract made under the internal laws of the State of New York, and for all
purposes shall be construed in accordance with the laws of said State, without
regard to conflicts of laws principles.

SECTION 4.4.               Separability.

         In case any one or more of the provisions contained in this Fourth
Supplemental Indenture or in the Securities shall for any reason be held to be
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provisions of this Fourth
Supplemental Indenture or of the Securities, but this Fourth Supplemental
Indenture and the Securities shall be construed as if such invalid or illegal or
unenforceable provision had never been contained herein or therein.

SECTION 4.5.               Counterparts.

         This Fourth Supplemental Indenture may be executed in any number of
counterparts each of which shall be an original, but such counterparts shall
together constitute but one and the same instrument.

         IN WITNESS WHEREOF, the parties hereto have caused this Fourth
Supplemental Indenture to be duly executed by their respective officers
thereunto duly authorized, on the date or dates indicated in the acknowledgments
and as of the day and year first above written.

                               SEMCO ENERGY, INC.
                               as Issuer

                               By:  /s/ Marcus Jackson
                                    -------------------------------------------
                               Name:    Marcus Jackson
                               Title:   Chairman of the Board, President and
                                        Chief Executive Officer

                               BANK ONE TRUST COMPANY, NATIONAL
                               ASSOCIATION, as Trustee

                               By:  /s/ Nan L. Packard
                                    -------------------------------------------
                               Name:    Nan L. Packard
                               Title:   Vice President

                                       8
<PAGE>

                                                                       EXHIBIT A

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY ("DTC") TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF
TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IN EXCHANGE FOR THIS
CERTIFICATE OR ANY PORTION HEREOF 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 HEREON 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 OTHER THAN DTC OR A NOMINEE THEREOF
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 THE DEPOSITORY TRUST COMPANY OR TO A SUCCESSOR
THEREOF OR SUCH SUCCESSOR'S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL
SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS
SET FORTH IN SECTION 305 OF THE INDENTURE REFERRED TO ON THE REVERSE HEREOF.

                                                           CUSIP NO. 78412D AG 4

No. 1                          SEMCO ENERGY, INC.

                               6.49% SENIOR NOTES
                                    DUE 2009

Principal Amount:                   $30,000,000

Regular Record Date:                The fifteenth calendar day, whether or not
                                    a Business Day, prior to the Interest
                                    Payment Date

Original Issue Date:                September 19, 2002

Maturity:                           October 1, 2009

Interest Payment Dates:             Semiannually on each April 1 and October 1
                                    commencing on April 1, 2003

Interest Rate:                      6.49% per annum

                                       1
<PAGE>

Authorized Denomination:            $1,000 or any integral multiple thereof

Place of Payment:                   Any designated office of the Trustee,
                                    including any such office located in the
                                    Borough of Manhattan.

         SEMCO Energy, Inc., a Michigan corporation (the "Company", which term
includes any successor corporation under the Indenture referred to on the
reverse hereto), for value received, hereby promises to pay to CEDE & CO. or its
registered assigns, the principal sum of THIRTY MILLION DOLLARS ($30,000,000) on
the Maturity shown above, unless redeemed prior thereto as hereinafter provided,
and to pay interest thereon from the Original Issue Date shown above, or from
the most recent Interest Payment Date to which interest has been paid or duly
provided for, in arrears on each Interest Payment Date as specified above in
each year, commencing on April 1, 2003, at the rate per annum shown above (the
"Interest Rate") until the principal hereof (and premium, if any) is paid or
made available for payment and on any overdue principal (and premium, if any)
and on any overdue installment of interest. The interest so payable, and
punctually paid or duly provided for, on any Interest Payment Date will, as
provided in such Indenture, be paid to the Person in whose name this Series
6.49% Senior Note (this "Security") is registered at the close of business on
the Regular Record Date as specified above next preceding such Interest Payment
Date. Except as otherwise provided in the Indenture, any such interest not so
punctually paid or duly provided for will forthwith cease to be payable to the
Holder on such Regular Record Date and may either be paid to the Person in whose
name this Security is registered at the close of business on a Special Record
Date for the payment of such defaulted interest to be fixed by the Trustee,
notice whereof shall be mailed to Holders of Securities of this series not less
than 10 days prior to such Special Record Date, or be paid at any time in any
other lawful manner not inconsistent with the requirements of any securities
exchange, if any, on which the Securities of this series shall be listed, and
upon such notice as may be required by any such exchange, all as more fully
provided in said Indenture.

         Interest payments for this Security shall be computed and paid on the
basis of a 360-day year of twelve 30-day months. In the event that any date on
which principal (and premium, if any) or interest is payable on this Security is
not a Business Day, then payment of the principal (and premium, if any) or
interest payable on such date will be made on the next succeeding day that is a
Business Day (and without any interest or payment in respect of any such delay)
with the same force and effect as if made on the date the payment was originally
payable.

         Payment of the principal (and premium, if any) of this Security, when
due and payable, shall be made upon surrender of this Security, at any Place of
Payment, in such coin or currency of the United States of America as at the time
of payment is legal tender for payment of public and private debts. At the
option of the Company, all payments of principal may be made by check to the
registered holder of the Security or such other person entitled thereto against
surrender of such Security. Payment of interest will be made, at the option of
the Company, (i) by check mailed to the address of the Person entitled thereto
as such address shall appear in the Security Register or (ii) by wire transfer
to an account maintained by the Person entitled thereto located inside the
United States.

                                       2
<PAGE>

         REFERENCE IS HEREBY MADE TO THE FURTHER PROVISIONS OF THIS SECURITY SET
FORTH ON THE REVERSE HEREOF, WHICH FURTHER PROVISIONS SHALL FOR ALL PURPOSES
HAVE THE SAME EFFECT AS IF SET FORTH AT THIS PLACE.

         Unless the certificate of authentication hereon has been executed by
the Trustee by manual signature, this Security shall not be entitled to any
benefit under the Indenture or be valid or obligatory for any purpose.

         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

Dated:  September 19, 2002

                                   SEMCO ENERGY, INC.

                                   By:
                                      ----------------------------------------
                                        Marcus Jackson
                                        Chairman of the Board, President and
                                        Chief Executive Officer

Attest:

---------------------------------
Sherry L. Abbott, Secretary

                          CERTIFICATE OF AUTHENTICATION

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

                    BANK ONE TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee

                    By:
                       --------------------------------------------------

                                       3
<PAGE>

                           (Reverse Side of Security)

         This Security is one of a duly authorized issue of Securities of the
Company (the "Securities"), issued and issuable in one or more series under an
Indenture, dated as of October 23, 1998 as supplemented by a First, Second,
Third and Fourth Supplemental Indenture (the "Indenture"), between the Company
and Bank One Trust Company, National Association, successor to NBD Bank, as
Trustee (the "Trustee", which term includes any successor trustee under the
Indenture), to which Indenture reference is hereby made for a statement of the
respective rights, limitation of rights, duties and immunities thereunder of the
Company, the Trustee and the Holders of the Securities issued thereunder and of
the terms upon which said Securities are, and are to be, authenticated and
delivered. This Security is one of the series designated on the face hereof as
6.49% Senior Notes Due 2009 (the "6.49% Senior Notes" or "Securities of this
series") in the aggregate principal amount of up to $30,000,000. Capitalized
terms used herein for which no definition is provided herein shall have the
meanings set forth in the Indenture.

         If an Event of Default with respect to the Securities of this series
shall occur and be continuing, the principal of the Securities of this series
may be declared due and payable in the manner, with the effect and subject to
the conditions provided in the Indenture.

         The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights of the Holders of the
Securities of all series affected under the Indenture at any time by the Company
and the Trustee with the consent of the Holders of not less than a majority in
principal amount of the Outstanding Securities of all series affected thereby
(voting as one class). The Indenture contains provisions permitting the Holders
of not less than a majority in principal amount of the Outstanding Securities of
any series with respect to which a default under the Indenture shall have
occurred and be continuing (voting as one class), on behalf of the Holders of
the Securities of such series, to waive, with certain exceptions, such default
under the Indenture and its consequences. The Indenture also permits the Holders
of not less than a majority in principal amount of the Securities of each series
at the time Outstanding, on behalf of the Holders of all Securities of such
series, to waive compliance by the Company with certain provisions of the
Indenture affecting such series. Any such consent or waiver by the Holder of
this Security shall be conclusive and binding upon such Holder and upon all
future Holders of this Security and of any Security issued upon the registration
of transfer hereof or in exchange hereof or in lieu hereof, whether or not
notation of such consent or waiver is made upon this Security.

         As provided in the Indenture and subject to certain limitations therein
set forth, the transfer of this Security is registrable in the Security
Register, upon surrender of this Security for registration of transfer at the
office or agency of the Company for such purpose, duly endorsed by, or
accompanied by a written instrument of transfer in form satisfactory to the
Company and the Security Registrar and duly executed by, the Holder hereof or
his attorney duly authorized in writing, and thereupon one or more new
Securities of this series, of authorized denominations and of like tenor and for
the same aggregate principal amount, will be issued to the designated transferee
or transferees. No service charge shall be made for any such registration of
transfer or

                                       1
<PAGE>

exchange, but the Company may require payment of a sum sufficient to
cover any tax or other governmental charge payable in connection therewith.

         As provided in and subject to the provisions of the Indenture, the
Holder of this Security shall not have the right to institute any proceeding
with respect to the Indenture or for the appointment of a receiver or trustee or
for any other remedy thereunder, unless such Holder shall have previously given
the Trustee written notice of a continuing Event of Default with respect to the
Securities of this series, the Holders of not less than 25% in principal amount
of the Securities of this series at the time Outstanding shall have made written
request to the Trustee to institute proceedings in respect of such Event of
Default as Trustee and offered the Trustee reasonable indemnity, and the Trustee
shall have failed to institute any such proceeding for 60 days after receipt of
such notice, request and offer of indemnity and shall not have received during
such 60-day period from the Holders of a majority in principal amount of
Securities of this series at the time Outstanding a direction inconsistent with
such request. The foregoing shall not apply to any suit instituted by the Holder
of this Security for the enforcement of any payment of principal hereof or any
interest hereon on or after the respective due dates expressed herein.

         The Indenture contains provisions for defeasance at any time of all or
a portion of the indebtedness of the Securities of this series and for covenant
defeasance at any time of certain covenants in the Indenture upon compliance
with certain conditions set forth in the Indenture.

         The Securities of this series are issuable only in registered form
without coupons in denominations of $1,000 and any integral multiple thereof.
As provided in the Indenture and subject to the limitations therein set forth,
Securities of this series are exchangeable for a like aggregate principal amount
of Securities of this series of any authorized denomination, as requested by the
Holder surrendering the same upon surrender of the Security or Securities to be
exchanged at any Place of Payment.

         Prior to the due presentment of a Security of this series for
registration of transfer, the Company, the Trustee and any agent of the Company
or Trustee may treat the registered Holder thereof as the owner of such Security
for the purpose of receiving payment of principal of (and premium, if any) and
(subject to certain Indenture provisions) interest on, such Security and for all
other purposes whatsoever, whether or not such Security be overdue, and neither
the Company, the Trustee nor any agent of the Company or the Trustee shall be
affected by notice to the contrary.

         This Security shall be governed by, and construed in accordance with,
the internal laws of the State of New York.

                                       2
<PAGE>

                                  ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this
instrument, shall be construed as though they were written out in full according
to applicable laws or regulations:

TEN COM - as tenants in common

TEN ENT - as tenants by the entireties

JT TEN - as joint tenants with rights
         of survivorship and not as
         tenants in common

UNIF GIFT MIN ACT -                             Custodian
                   ----------------------------           ----------------------
                             (Cust)                               (Minor)

Under Uniform Gifts to Minors Act
                                 -----------------------------------------------
                                                   (State)

Additional abbreviations may also be used though not on the above list.

------------------------------------------------------------------------------

         FOR VALUE RECEIVED, the undersigned hereby sell(s) and transfers)
unto                  (please insert Social Security or other identifying
    ------------------
number of assignee).

--------------------------------------------------------------------------------
PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE
OF ASSIGNEE

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
the within Security and all rights thereunder, hereby irrevocably constituting
and appointing                      agent to transfer said Security on the books
              ----------------------
of the Company, with full power of substitution in the premises.

Dated:
      -------------------------     -------------------------------------------

        NOTICE: The signature to this assignment must correspond with the
        name as written upon the face of the within instrument in every
        particular without alteration or enlargement, or any change
        whatever.

Signature(s) must be guaranteed by an eligible guarantor institution
participating in a Securities Transfer Association's recognized signature
guarantee program.

                                       3

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