Document:

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                                                                   EXHIBIT 10.13

                              ARCH CHEMICALS, INC.
                   1999 STOCK PLAN FOR NON-EMPLOYEE DIRECTORS
                     (As amended through December 28, 2001)

      1. PURPOSE. The purpose of the Arch Chemicals, Inc. 1999 Stock Plan for
Non-employee Directors is to promote the long-term growth and financial success
of Arch Chemicals, Inc. by attracting and retaining non-employee directors of
outstanding ability and by promoting a greater identity of interest between its
non-employee directors and its shareholders.

      2. DEFINITIONS. The following capitalized terms utilized herein have the
following meanings:

            "Annual Director Grant" means the number of phantom shares of Common
      Stock, Options and/or Performance Shares to be granted annually to a
      Non-employee Director pursuant to Section 6(a), such number shall be fixed
      by the Board during 1999 following the Distribution Date and may be
      adjusted prospectively by such Board from time to time thereafter.

            "Arch Stock Account" means the Stock Account to which phantom shares
      of Common Stock are credited from time to time.

            "Board" means the Board of Directors of the Company.

            "Cash Account" means an account established under the Plan for a
      Non-employee Director to which cash meeting fees and retainers have been
      or are to be credited in the form of cash.

            "Change in Control" means any of the following:

                  (i) the Company ceases to be, directly or indirectly, owned of
            record by at least 1,000 shareholders;

                  (ii) a person, partnership, joint venture, corporation or
            other entity, or two or more of any of the foregoing acting as a
            "person" within the meaning of Section 13(d)(3) of the 1934 Act,
            other than the Company, a majority-owned subsidiary of the Company
            or an employee benefit plan of the Company or such subsidiary (or
            such plan's related trust), become(s) the "beneficial owner" (as
            defined in Rule 13d-3 under the 1934 Act) of 20% or more of the then
            outstanding voting stock of the Company;
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                  (iii) during any period of two consecutive years, individuals
            who at the beginning of such period constitute the Board (together
            with any new director whose election by the Board or whose
            nomination for election by the Company's shareholders was approved
            by a vote of at least two-thirds of the directors then still in
            office who either were directors at the beginning of such period or
            whose election or nomination for election was previously so
            approved) cease for any reason to constitute a majority of the
            directors then in office;

                  (iv) all or substantially all of the business of the Company
            is disposed of pursuant to a merger, consolidation or other
            transaction in which the Company is not the surviving corporation or
            the Company combines with another company and is the surviving
            corporation (unless the shareholders of the Company immediately
            following such merger, consolidation, combination, or other
            transaction beneficially own, directly or indirectly, more than 50%
            of the aggregate voting stock or other ownership interests of (x)
            the entity or entities, if any, that succeed to the business of the
            Company or (y) the combined company); or

                  (v) the shareholders of the Company approve a sale of all or
            substantially all of the assets of the Company or a liquidation or
            dissolution of the Company.

            "Code" means the Internal Revenue Code of 1986, as amended from time
      to time.

            "Committee" means the Compensation Committee (or its successor) of
      the Board.

            "Common Stock" means the Company's Common Stock, par value $1.00 per
      share.

            "Company" means Arch Chemicals, Inc., a Virginia corporation, and
      any successor.

            "Credit Date" means the first day of each calendar quarter,
      beginning with April 1, 1999.

            "Distribution" means the distribution of the shares of the Company
      by Olin in a spinoff to Olin's
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      shareholders.

            "Distribution Date" means the dividend payment date fixed by the
      Olin Board of Directors for the distribution of the shares of Common Stock
      to the public shareholders of Olin.

            "Excess Retainer" means with respect to a Non-employee Director the
      amount of the full annual cash retainer payable to such Non-employee
      Director from time to time by the Company for service as a director in
      excess of the amount paid in shares of Common Stock, if any, pursuant to
      Section 6(b).

            "Fair Market Value" means, with respect to a date, on a per share
      basis, (i) with respect to Common Stock or phantom shares of Common Stock,
      the average of the high and the low price of a share of Common Stock
      reported on the consolidated tape of the New York Stock Exchange (or such
      other primary exchange on which the Common Stock is traded) ("Exchange")
      on such date or if the Exchange is closed on such date, the next
      succeeding date on which it is open and (ii) with respect to phantom
      shares of Olin Common Stock, the average of the high and the low price of
      a share of Olin Common Stock reported on the consolidated tape of the
      Exchange on such date or if the Exchange is closed on such date, the next
      succeeding date on which it is open.

            "Interest Rate" means the rate of interest equal to the Company's
      before-tax cost of borrowing as determined from time to time by the Chief
      Financial Officer, the Treasurer or the Controller of the Company (or in
      the event there is no such borrowing, the Federal Reserve A1/P1 Composite
      rate for 90-day commercial paper plus 10 basis points, as determined by
      any such officer) or such other rate as determined from time to time by
      the Board or the Committee.

            "1999 Non-employee Director" means a Non-employee Director who
      becomes such on or after the Distribution Date but prior to December 31,
      1999, and who was not a non-employee director of Olin.

            "1997 Plan" means the 1997 Stock Plan for Non-employee Directors of
      Olin Corporation as in effect on the Distribution Date.

            "1934 Act" means the Securities Exchange Act of 1934, as amended
      from time to time.
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            "Non-employee Director" means a member of the Board who is not an
      employee of the Company or any subsidiary thereof.

            "Olin" means Olin Corporation, a Virginia corporation.

            "Olin Common Stock" means shares of common stock of Olin, par value
      $1.00 per share.

            "Olin Stock Account" means the Stock Account to which phantom shares
      of Olin Common Stock are credited from time to time.

            "Option" means an option to purchase shares of Common Stock granted
      under Section 6(a)(2).

            "Performance Shares" means an award of phantom shares or units of
      Common Stock contingent upon the achievement of specified performance
      goals granted under Section 6(a)(3).

            "Plan" means this Arch Chemicals, Inc. 1999 Stock Plan for
      Non-employee Directors as amended from time to time.

            "Retirement Date" means the date the Non-employee Director ceases to
      be a member of the Board for any reason.

            "Stock Account" means an account established under the Plan for a
      Non-employee Director to which shares of stock have been or are to be
      credited in the form of phantom stock, including the Olin Stock Account
      and the Arch Stock Account.

      3. TERM. The Plan shall be effective on the Distribution Date. Once
effective, the Plan shall operate and shall remain in effect until terminated as
provided in Section 9 hereof.

      4. ADMINISTRATION. Full power and authority to construe, interpret and
administer the Plan shall be vested in the Committee. Decisions of the Committee
shall be final, conclusive and binding upon all parties.

      5. PARTICIPATION. All Non-employee Directors shall participate in the
Plan.
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      6. GRANTS AND DEFERRALS.

            (a) Annual Award. Each Non-employee Director who is serving as such
on January 1 shall be credited with the Annual Director Grant on January 1 of
each calendar year beginning not earlier than 2000. In the event a person
becomes a Non-employee Director after January 1 of any calendar year beginning
with 2000, such Non-employee Director shall not be credited with the Annual
Director Grant for such year. By December 31 of each year commencing with 1999,
the Board shall determine if the Annual Director Grant to each Non-employee
Director for the next following calendar year shall be determined under (1), (2)
or (3) below (or any combination thereof).

                  (1) Stock Grant. Subject to the terms and conditions of the
Plan, the Annual Director Grant may consist of a grant of phantom shares of
Common Stock. Actual receipt of shares shall be deferred until the Non-employee
Director's Retirement Date unless the Board elects otherwise prior to the actual
grant, in which case the shares will be distributed as soon as practicable
following their grant unless deferred by a Non-employee Director with the
approval of the Board. If the shares are deferred each eligible Non-employee
Director shall receive a credit to his or her Arch Stock Account in the amount
of such shares as of January 1 of the calendar year for which the award is made.
Subject to the approval of the Board, a Non-employee Director may elect in
accordance with Section 6(e) to defer to his or her Arch Stock Account receipt
of all or any portion of such shares to a date or dates on or following such
Non-employee Director's Retirement Date. Except with respect to any shares the
director has so deferred, certificates representing such shares shall be
delivered to the Non-employee Director (or in the event of death, to his or her
beneficiary designated pursuant to Section 6(h)) as soon as practicable
following the Retirement Date.

                  (2) Stock Options. Subject to the terms and conditions of the
Plan and such additional terms and conditions, consistent with the terms of the
Plan as the Committee shall determine, the Annual Director Grant may consist of
a grant of Options. The exercise price per share of Common Stock of each Option
shall be equal to the Fair Market Value of a share of Common Stock on the date
of a grant. The term of each Option shall be equal to 10 years from the date of
grant (whether or not the grantee continues to be a Non-employee Director for
the full term). The
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Committee shall determine the time or times at which Options may be exercised in
whole or in part (but in no event shall an Option be exercisable after the
expiration of ten years from the date of its grant and shall determine the
method or methods by which payment of the exercise price in respect thereto may
be made.

                  (3) Performance Shares. Subject to the terms and conditions of
the Plan and such additional terms and conditions, consistent with the terms of
the Plan as the Committee shall determine, the Annual Director Grant may consist
of a grant of Performance Shares. Such award shall confer on the holder thereof
the right to receive one share of Common Stock for each Performance Share
credited to his Stock Account upon the achievement of specified performance
goals during such performance periods as the Committee shall establish prior to
the date of the grant. The performance goals to be achieved during any
performance period and the length of any performance period shall be determined
by the Committee, provided that a performance period shall be at least one year,
subject to Section 6(g) hereof. The Committee may adjust the performance goals
in the event of extraordinary or unusual events.

            Each eligible Non-employee Director shall receive a credit to his or
her Arch Stock Account in the amount of such Performance Shares as of the
January 1 of the calendar year for which the award is made. Actual receipt of
the shares of Common Stock will be deferred until completion of the performance
period and distribution will occur only if the performance goals are satisfied.
Subject to the approval of the Board, a Non-employee Director may elect in
accordance with Section 6(e) to further defer receipt of all or any portion of
such Common Stock. Except with respect to any Performance Shares the Director
has so deferred, certificates representing such shares shall be delivered to the
Non-employee Director (or in the event of death, to his or her beneficiary
designated pursuant to Section 6(h)) as soon as practicable following
satisfaction of the performance goals and completion of the performance period.
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            (b) Annual Retainer Stock Grant. By December 31 of each year
commencing with 1999, the Board shall determine if all or any portion of the
annual retainer for the next following calendar year shall be paid in shares of
Common Stock. Subject to the terms and conditions of the Plan, if the Board
determines for a calendar year that all or a portion of the annual retainer
shall be paid in shares of Common Stock, on January 1 of such year, each
Non-employee Director who is such on such date shall receive a specified number
of shares of Common Stock as determined by the Board. In the event a person
becomes a Non-employee Director beginning in or after 2000 on a date subsequent
to January 1 during a calendar year and has not received the annual stock
retainer for such calendar year, such person, on the first day of the calendar
month following his or her becoming such, shall receive that number of shares
(rounded up to the next whole share in the event of a fractional share) of
Common Stock equal to one-twelfth of the number of shares of the annual retainer
to be paid in Common Stock times the number of whole calendar months remaining
in such calendar year following the date he or she becomes a Non-employee
Director. In the case of a 1999 Non-employee Director, for 1999 such person
shall receive on the first day of the calendar month following his or her
becoming such that number of shares (rounded up to the next whole share) of
Common Stock having an aggregate Fair Market Value equal to $2084 times the
number of whole calendar months remaining in the calendar year after he or she
becomes a 1999 Non-Employee Director. Subject to the approval of the Board
(which approval shall not be required for a 1999 election by a 1999 Non-employee
Director), a Non-employee Director may elect to defer receipt of all or any
portion of such shares in accordance with Section 6(e). Except with respect to
any shares the director has so deferred, certificates representing such shares
shall be delivered to such Non-employee Director as soon as practicable
following the date as of which the shares are awarded.

            (c) Election to Receive Meeting Fees and Excess Retainer in Stock in
Lieu of Cash. Subject to the terms and conditions of the Plan and the approval
of the Board, a Non-employee Director may elect to receive all or a portion of
the director meeting fees and all or a portion of the Excess Retainer payable in
cash by the Company for his or her services as a director for the calendar year
in the form of shares of Common Stock. Such election shall be made in accordance
with Section 6(e). If approved by the Board, the number of shares (rounded up to
the next whole share in the event of a fractional share) for a calendar year
payable to a Non-employee Director who so elects to receive all or a
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portion of the Excess Retainer in the form of shares for such year shall be paid
on January 1 (or in the case of proration, when the annual stock retainer is to
be paid or credited) equal to the amount of Excess Retainer which has been
elected to be paid in shares divided by the Fair Market Value per share on
January 1 of such calendar year (or in the case of a Non-employee Director who
becomes such after January 1, on the first day of the calendar month following
the day such new Non-employee Director became such). If approved by the Board,
the number of shares (rounded up to the next whole share in the event of a
fractional share) for a calendar quarter payable to a Non-employee Director who
so elects to receive meeting fees in the form of shares shall be equal to the
aggregate amount on the Credit Date following such quarter of the director
meeting fees which have been earned in such quarter and which are elected to be
paid in shares divided by the Fair Market Value per share of Common Stock on
such Credit Date. Except with respect to any shares the director has deferred,
certificates representing such shares shall be delivered to the Non-employee
Director as soon as practicable following the date as of which the Excess
Retainer and/or meeting fees would have been paid in cash absent an election
hereunder. Notwithstanding anything in the Plan to the contrary, the approval of
the Board shall not be required for any 1999 election made by a 1999
Non-employee Director.

            (d) Deferrals of Meeting Fees and Excess Retainer. Subject to the
terms and conditions of the Plan and the approval of the Board, a Non-employee
Director may elect to defer all or a portion of the shares payable under Section
6(c) and all or a portion of the director meeting fees and Excess Retainer
payable in cash by the Company for his or her service as a director for the
calendar year. If approved by the Board, the amount of the Excess Retainer
deferred in cash shall be credited on January 1 (or in the case of proration, on
the first day of the next calendar month following the day such new Non-employee
Director becomes such). Such election shall be made in accordance with Section
6(e). Subject to the approval of the Board, a Non-employee Director who elects
to so defer shall have any deferred shares deferred in the form of shares of
Common Stock and any deferred cash fees and retainer deferred in the form of
cash. Notwithstanding any thing in the Plan to the contrary, the approval of the
Board shall not be required for any 1999 election made by a 1999 Non-employee
Director.

            (e) Elections.

                  (1) Deferrals. All elections under Sections
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      6(a), 6(b), 6(c), 6(d), 6(e)(2) and 6(e)(3) shall (A) be made in writing
      and delivered to the Secretary of the Company and (B) be irrevocable. All
      Non-employee Director elections for payments in cash or stock or for
      deferrals shall be made before January 1 of the year in which the shares
      of Common Stock or director's fees and retainer are to be earned (or, in
      the case of an individual who becomes a Non-employee Director during a
      calendar year, prior to the date of his or her election as a director).
      Deferral elections shall also (A) specify the portions (in 25% increments)
      to be deferred and (B) specify the future date or dates on which deferred
      amounts are to be paid, or the future event or events upon the occurrence
      of which the deferred amounts are to be paid, and the method of payment
      (lump sum or annual installments (up to 10)). However, subject to the
      approval of the Board, a Non-employee Director may elect to defer all of
      his or her cash dividends on the Stock Account in whole and not in part
      and all of his or her interest on the Cash Account in whole but not in
      part. Installment payments from an Account shall be equal to the Account
      balance (expressed in shares in the case of the Stock Account, otherwise
      the cash value of the Account) at the time of the installment payment
      times a fraction, the numerator of which is one and the denominator of
      which is the number of installments not yet paid. Fractional shares to be
      paid in any installment shall be rounded up to the next whole share. In
      the event of an election under Section 6(c) for director meeting fees or
      Excess Retainer to be paid in shares of Common Stock, the election shall
      specify the portion (in 25% increments) to be so paid. Any change with
      respect to the terms of a Non-employee Director's election for (A) amount
      or form of any future deferral or the form of payment of any director
      compensation hereunder may be made at any time prior to such compensation
      being earned (and in the case of quarterly fees, prior to the start of the
      quarter in which the fees are to be earned) and (B) the timing (which
      timing may not accelerate a distribution date) or amount of payments from
      any Account shall only be effective if made at least six months prior to
      the payout and in the calendar year prior to the calendar year payout is
      to occur.

                  (2) Stock Account. On the Credit Date (or in the case of a
      proration, on the first day of the appropriate calendar month), a
      Non-employee Director who has deferred shares under Sections 6(b) or 6(d)
      shall receive a credit to his or her Stock Account. The amount
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      of such credit shall be the number of shares so deferred (rounded to the
      next whole share in the event of a fractional share). A Non-employee
      Director may elect to defer the cash dividends paid on his or her Stock
      Account in accordance with Section 6(e)(1).

                  (3) Cash Account. On the Credit Date or in the case of the
      Excess Retainer, on the day on which the Non-employee Director is entitled
      to receive such Excess Retainer, a Non-employee Director who has deferred
      cash fees and/or the Excess Retainer under Section 6(d) in the form of
      cash shall receive a credit to his or her Cash Account. The amount of the
      credit shall be the dollar amount of such Director's meeting fees earned
      during the immediately preceding quarterly period or the amount of the
      Excess Retainer to be paid for the calendar year, as the case may be, and
      in each case, specified for deferral in cash. A Non-employee Director may
      elect to defer interest paid on his or her Cash Account in accordance with
      Section 6(e)(1).

                  (4) Dividends and Interest. Each time a cash dividend is paid
      on Common Stock or Olin Common Stock, a Non-employee Director who has
      shares of such stock (other than shares attributable to Performance
      Shares) credited to his or her Stock Account shall be paid on the dividend
      payment date such cash dividend in an amount equal to the product of the
      number of shares credited to the Non-employee Director's Arch Stock
      Account or Olin Stock Account, as the case may be, on the record date for
      such dividend times the dividend paid per share unless subject to the
      approval of the Board, the director has elected to defer such dividend to
      his or her Stock Account as provided herein, in which case the
      Non-employee Director shall receive a credit for such dividends on the
      dividend payment date to his or her Arch Stock Account or Olin Stock
      Account, as the case may be. The amount of the dividend credit shall be
      the number of shares (rounded to the nearest one-thousandth of a share) of
      Common Stock determined by multiplying the dividend amount per share by
      the number of shares credited to such director's applicable Stock Account
      as of the record date for the dividend and dividing the product by the
      Fair Market Value per share on the dividend payment date. At the election
      of the Board, dividend equivalents (determined as described above) shall
      also be paid with respect to Performance Shares held in a Non-employee
      Director's Arch Stock Account; provided, however, that such dividend
      equivalents shall be automatically deferred until, when
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      and if the underlying Performance Shares are distributed in the form of
      Common Stock.

                  A Non-employee Director who has a Cash Account shall be paid
      directly on each Credit Date interest on such account's balance at the end
      of the preceding quarter, payable at a rate equal to the Interest Rate in
      effect for such preceding quarter unless with the approval of the Board,
      such Non-employee Director has elected to defer such interest to his or
      her Cash Account, in which case such interest shall be credited to such
      Cash Account on the Credit Date.

                  (5) Payouts. Cash Accounts and the Olin Stock Account will be
      paid out in cash, and the Arch Stock Accounts shall be paid out in shares
      of Common Stock unless the Non-employee director elects otherwise. Cash
      amounts and certificates representing shares credited to the Arch Stock
      Account to be distributed in Common Stock shall be delivered to the
      Non-employee Director as soon as practicable following the termination of
      the deferral and consistent therewith; provided that with respect to any
      and all amounts or grants credited to the Arch Stock Accounts after
      December 31, 2001, amounts so credited (and any portions thereof including
      dividend equivalents credited) may, if the Board so specifies, be payable
      only in cash upon payout at the then Fair Market Value (except as
      otherwise provided in Section 6(g)).

            (f) No Stock Rights. Except as expressly provided herein, the
deferral of shares of Common Stock into a Stock Account shall confer no rights
upon such Non-employee Director, as a shareholder of the Company or otherwise,
with respect to the shares held in such Stock Account, but shall confer only the
right to receive such shares credited as and when provided herein. A
Non-employee Director who has been granted an Option hereunder shall have no
rights as a shareholder until such time as his or her Option is exercised.

            (g) Change in Control. Notwithstanding anything to the contrary in
this Plan or any election, in the event a Change in Control occurs, (1) all
Performance Shares shall become vested and deemed earned in full notwithstanding
that the applicable performance cycle shall not have been completed, and (2)
amounts and shares credited to Cash Accounts (including interest accrued to the
date of payout) and Stock Accounts shall be promptly distributed to Non-employee
Directors except that the Arch Stock Account shall be paid out in cash and not
in the form of shares of Common Stock. For this purpose, the cash value of the
amount in the
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Arch Stock Account shall be determined by multiplying the number of shares held
in the Arch Stock Account by the higher of (i) the highest Fair Market Value on
any date within the period commencing 30 days prior to such Change in Control
and ending on the date of the Change in Control, or (ii) if the Change in
Control occurs as a result of a tender or exchange offer or consummation of a
corporate transaction, then the highest price paid per share of Common Stock
pursuant thereto.

            (h) Beneficiaries. A Non-employee Director may designate at any time
and from time to time a beneficiary for his or her Stock and Cash Accounts in
the event his or her Stock or Cash Account may be paid out following his or her
death. Such designation shall be in writing and must be received by the Company
prior to the death to be effective.

            (i) 1997 Plan Accounts. As of the Distribution Date, the cash and
stock accounts of each Non-employee Director who immediately prior to the
Distribution Date was a participant in the 1997 Plan shall be transferred from
the 1997 Plan to this Plan after giving effect to the adjustment for the
Distribution in accordance with Section 6(k) of the 1997 Plan as in effect on
the Distribution Date. Such amounts shall be transferred, in the case of an
account denominated in cash, to the Cash Account, in the case of a transferred
account denominated in Olin Common Stock, to the Olin Stock Account, and in the
case of an account denominated in Common Stock to the Common Stock Account.

            Shares credited to the Arch Stock Account pursuant to this paragraph
6(i) shall be treated as follows: (i) to the extent such shares represent a
dividend on shares of Olin Common Stock credited pursuant to paragraph 6(a)(1)
of the 1997 Plan (or shares arising from dividend equivalents thereon), such
shares shall be deemed credited pursuant to paragraph 6(a) of the Plan, (ii) to
the extent such shares represent a dividend on shares of Olin Common Stock
credited pursuant to paragraph 6(b) of the 1997 Plan (or shares arising from
dividend equivalents thereon), such shares shall be deemed credited pursuant to
paragraph 6(b) of this Plan, and (iii) to the extent such shares represent a
dividend on shares of Olin Common Stock credited under paragraph 6(c) of the
1997 Plan (or shares arising from dividend equivalents thereon), such shares
shall be deemed credited pursuant to paragraph 6(a)(1) of the Plan. The most
recent prior elections and beneficiary designations applicable to the 1997 Plan
shall govern this Plan unless changed subsequent to the Distribution Date or
inconsistent with this Plan. Approval of the Board shall not be required for any
such elections for 1999 but shall be required in accordance with the terms of
this Plan
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for years after 1999.

            (j) Stock Account Transfers. A Non-Employee Director may elect from
time to time to transfer all or a portion (in 25% increments) of his or her Olin
Stock Account to his or her Arch Stock Account. The amount of phantom shares of
Common Stock to be credited to a Non-Employee Director's Arch Stock Account
shall be equal to the number of shares of Common Stock that could be purchased
if the number of phantom shares of Olin Common Stock in his or her Olin Stock
Account being transferred were sold and the proceeds reinvested in Common Stock
based on the Fair Market Value of each. Except as provided in Section 6(e)(4)
with respect to dividends or in Section 8, no additional contributions or
additions may be made to a Non-Employee Director's Olin Stock Account after the
Distribution Date.

      7. LIMITATIONS AND CONDITIONS.

            (a) Total Number of Shares. The total number of shares of Common
Stock that may be issued to Non-employee Directors under the Plan is 150,000.
Such total number of shares may consist, in whole or in part, of authorized but
unissued shares. The foregoing number may be increased or decreased by the
events set forth in Section 8 below. No fractional shares shall be issued
hereunder. In the event a Non-employee Director is entitled to a fractional
share, such share amount shall be rounded upward to the next whole share amount.

            (b) No Additional Rights. Nothing contained herein shall be deemed
to create a right in any Non-employee Director to remain a member of the Board,
to be nominated for reelection or to be reelected as such or, after ceasing to
be such a member, to receive any cash or shares of Common Stock under the Plan
which are not already credited to his or her accounts.

      8. STOCK ADJUSTMENTS. In the event of any merger, consolidation, stock or
other non-cash dividend, extraordinary cash dividend, split-up, spin-off,
combination or exchange of shares or recapitalization or change in
capitalization, or any other similar corporate event, the Committee may make
such adjustments in (i) the aggregate number of shares of Common Stock that may
be issued under the Plan as set forth in Section 7(a) and the number of shares
and/or Options that may be issued to a Non-employee Director with respect to any
year as set forth in Section 6(a) and the number of shares of Olin Common Stock
or Arch Common Stock, as the case may be, held in
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a Stock Account, (ii) the class of shares that may be issued under the Plan,
(iii) the amount and type of payment that may be made in respect of unpaid
dividends on shares of Common Stock or Olin Common Stock whose receipt has been
deferred pursuant to Section 6(e), and (iv) the exercise price with respect to
any award of Options or, if the Committee deems it appropriate, make provision
for cash payment to the holder of an outstanding Option, as the Committee shall
deem appropriate in the circumstances. The determination by the Committee as to
the terms of any of the foregoing adjustments shall be final, conclusive and
binding for all purposes of the Plan.

      9. AMENDMENT AND TERMINATION. This Plan may be amended, suspended or
terminated by action of the Board. No termination of the Plan shall adversely
affect the rights of any Non-employee Director with respect to any amounts
otherwise payable or credited to his or her Cash Account or Stock Account.

      10. NONASSIGNABILITY. No right to receive any payments under the Plan or
any amounts credited to a Non-employee Director's Cash or Stock Account shall be
assignable or transferable by such Non-employee Director other than by will or
the laws of descent and distribution or pursuant to a domestic relations order.
The designation of a beneficiary under Section 6(h) by a Non-employee Director
does not constitute a transfer.

      11. UNSECURED OBLIGATION. Benefits payable under this Plan shall be an
unsecured obligation of the Company.

      12. RULE 16b-3 COMPLIANCE. It is the intention of the Company that all
transactions under the Plan be exempt from liability imposed by Section 16(b) of
the 1934 Act. Therefore, if any transaction under the Plan is found not to be in
compliance with an exemption from such Section 16(b), the provision of the Plan
governing such transaction shall be deemed amended so that the transaction does
so comply and is so exempt, to the extent permitted by law and deemed advisable
by the Committee, and in all events the Plan shall be construed in favor of its
meeting the requirements of an exemption.<PAGE>

                                                                   Exhibit 10.23

DATED                                                          13 SEPTEMBER 2000
--------------------------------------------------------------------------------

                            HICKSON INTERNATIONAL PLC

                                     - and -

                                MR. J.H. MARKHAM

             ------------------------------------------------------
                                SERVICE AGREEMENT
             ------------------------------------------------------

                                                      HERBERT SMITH
                                                      Exchange House,
                                                      Primrose Street,
                                                      London EC2A 2HS
                                                      Tel: 020 7374 8000
                                                      Fax: 020 7374 0888
                                                      Ref: 2090/30808518
<PAGE>
AGREEMENT made on 13 September 2000

BETWEEN:

1.       HICKSON INTERNATIONAL PLC a company incorporated in England with
         registered number 499821 whose registered office is at Wheldon Road,
         Castleford, West Yorkshire WF10 2JT (the "COMPANY"); and

2.       JOHN H. MARKHAM of Rob Royd House, Hound Hill Lane, Worsbrough,
         Barnsley, S706TU ("MR. MARKHAM")

IT IS AGREED as follows:

1.       INTERPRETATION

1.1      In this Agreement:

         1.1.1    "ASSOCIATE" means a body corporate which for the time being:

                  (A)      is a holding company of the Company or a subsidiary
                           (other than the Company) of such a holding company;
                           or

                  (B)      has not less than 20 per cent of its equity share
                           capital beneficially owned by such a holding company
                           or the Company; or

                  (C)      directly or indirectly controls or is owned by or
                           under common control with the Company.

         1.1.2    "DATE OF TERMINATION" means the date on which the employment
                  of Mr. Markham by the Company terminates save pursuant to an
                  assignment by the Company pursuant to clause 20 below in which
                  case it shall mean the date on which his employment with such
                  assignee shall terminate;

         1.1.3    "SUBSIDIARY", "HOLDING COMPANY" and "EQUITY SHARE CAPITAL"
                  have the meaning attributed to them by sections 736, 736A and
                  744 of the Companies Act 1985 provided that the term
                  "subsidiary" shall also include a subsidiary undertaking (as
                  defined in section 258 of the Companies Act 1985);

         1.1.4    "RECOGNISED STOCK EXCHANGE" means any body of persons which is
                  a recognised investment exchange for the purpose of the
                  Financial Services Act 1986;

         1.1.5    "WORKING DAYS" means Monday to Friday in such week (ignoring
                  public holidays);

         1.1.6    unless otherwise stated, a reference to the employment of Mr.
                  Markham is to his employment by the Company (or if appropriate
                  any assignee pursuant to clause 20) under this Agreement;

         1.1.7    unless the context otherwise requires, words in the singular
                  include the plural and vice versa, and a reference to a person
                  includes a reference to a body corporate and to an
                  unincorporated body of persons;

         1.1.8    a reference to a statute or statutory provision includes a
                  reference to that statute or provision as from time to time
                  modified or re-enacted;
<PAGE>
         1.1.9    clause headings are for convenience only and have no legal
                  effect.

2.       APPOINTMENT AND TERM

2.1      Mr. Markham will be employed by the Company with the title of Vice
         President, International Operations of the Company and Arch Chemicals,
         Inc. ("ARCH") or such other title or position as determined by the
         Chief Executive Officer of Arch from time to time.

2.2      His employment under this Agreement will begin on 13th September 2000
         and will continue, subject to the terms of this Agreement, until
         determined by either party giving to the other not less than 3 months'
         written notice.

3.       DUTIES ETC

3.1      During the continuance of his employment Mr. Markham will:

         3.1.1    perform such duties as may from time to time be assigned to
                  him by the board of directors of the Company (the "BOARD") or
                  by Arch's Chief Executive Officer (or such other person
                  designated per clause 3.1.2), whether those duties relate to
                  the business of the Company or to the business of any
                  subsidiary or associate of the Company;

         3.1.2    report to Arch's Chief Executive Officer (or such other person
                  designated by such Chief Executive Officer) and in all
                  respects comply with lawful directions given by or under the
                  authority of the Board and the person to whom he reports;

         3.1.3    use all reasonable endeavours to promote the interests of the
                  Company;

         3.1.4    unless prevented by incapacity, devote the whole of his time,
                  attention and ability during his agreed hours of work to the
                  performance of his duties under this Agreement; and

         3.1.5    at all times, promptly give to the Board and to Arch (in
                  writing if so requested) all such information and explanations
                  as they may require in connection with matters relating to his
                  employment under this Agreement or with the business of the
                  Company or any with the business of any subsidiary or
                  associate of the Company.

3.2      The agreed hours of work of Mr. Markham will be between 08.45 and 17.15
         on Mondays to Fridays and such other hours as may be required for the
         proper performance of his duties under this Agreement. He will perform
         those duties at the Company's registered office or elsewhere as the
         Board may from time to time determine.

3.3      Notwithstanding the foregoing provisions of this clause, if notice is
         served by either party pursuant to clause 2 above, the Company shall
         not be obliged to provide any work for Mr. Markham or to assign to or
         vest in Mr. Markham any powers, duties or functions and may in its
         discretion suspend Mr. Markham on full salary and other contractual
         benefits and require Mr. Markham:

         3.3.1    not to enter any premises of the Company or any subsidiary or
                  associate of the Company;
<PAGE>
         3.3.2    to abstain from contacting any customers, clients, employees
                  or suppliers of the Company or any subsidiary or associate of
                  the Company; and

         3.3.3    to resign from all offices in the Company, or any subsidiary
                  or associate of the Company

         and Mr. Markham irrevocably authorises the Company in his name and on
         his behalf to execute all documents and do all things necessary to
         effect the resignations referred to in 3.3.3 above, in the event of his
         failure to do so.

         Mr. Markham shall not be employed by or provide services to any third
         party during the period for which he is suspended pursuant to this
         clause.

4.       SALARY

4.1      Mr. Markham will be entitled to a salary at the rate of L175,000 per
         annum. With effect from 1st January 2001, Mr. Markham's salary will be
         increased by 2%. In addition, if following a competitive review by Arch
         of similar positions held at companies similarly situated to Arch, the
         Company may elect to increase Mr. Markham's salary on 1st January 2001
         further. Mr. Markham's salary will be reviewed, but not necessarily
         increased, with effect from 1st January in each year of his employment
         from 1st January 2002 onwards.

4.2      Mr. Markham's salary will accrue from day to day, be payable by equal
         monthly instalments on the seventeenth of each month, and be inclusive
         of any other sums receivable as directors fees or other remuneration to
         which he may be or become entitled as a director of the Company or of
         any of its subsidiaries or associates.

4.3      In addition to his salary, Mr. Markham will be eligible to participate
         in the Arch Annual Incentive Plan's bonus scheme, details of which are
         available from the Vice President-Human Resources of Arch, on such
         terms and at such level as the Chief Executive Officer of Arch may from
         time to time determine. The Company reserves the right to amend the
         terms of or terminate this scheme and to alter the level of Mr.
         Markham's participation therein without reference to or agreement from
         Mr. Markham.

5.       PENSION AND INSURANCE BENEFITS

5.1      Mr. Markham will be entitled during the continuance of his employment
         to remain a member of the Hickson UK Senior Executive Pension Scheme
         (including inter alia, the Hickson UK Group Pension Scheme, which
         includes benefits relating to an Ill Health Early Retirement Scheme).
         In accordance with the rules of the Scheme, the Company shall duly and
         punctually pay all contributions due from it. Particulars of the Scheme
         are obtainable on application to the Personnel Manager of the Company.
         Membership of the Scheme will entitle Mr. Markham to benefits subject
         to the rules of the Scheme as varied from time to time, and in
         particular (without limitation) subject to the powers of amendment
         and/or discontinuance contained in those rules. To the extent that
         current law and practice do not allow payment to the relevant pension
         scheme, an additional payment will be made to Mr. Markham as
         compensation at a rate of 20% of his salary (and excluding bonus
         payments and payments under clause 14.10 and the related side letter
         executed in September 2000) not subject to the pension payment.
<PAGE>
5.2      A contracting out certificate is in force in respect of the employment
         of Mr. Markham.

6.       CAR

         The Company will provide a suitable car for Mr. Markham's business use
         during the continuance of his employment in accordance with the
         Company's car policy, a copy of which is available on application to
         Arch's Chief Financial officer, and will pay all costs relating to it
         (including the cost of fuel, licence, insurance, maintenance and
         telephone rental and call charges). Mr. Markham will take good care of
         the car and will ensure at all times that the car is in the condition
         required by law.

7.       EXPENSES

         The Company will reimburse Mr. Markham all reasonable travelling,
         hotel, entertainment and other expenses properly incurred by him in the
         performance of his duties under this Agreement and Mr. Markham will
         provide the Company with receipts or other evidence of the payment of
         such expenses as may be reasonably required in accordance with the
         Company's expense reporting procedure in force from time to time.

8.       HOLIDAYS

8.1      Mr. Markham will be entitled to 25 working days' holiday in each
         calendar year, to be taken at such times as may be approved by the
         Board, in addition to public holidays. Holidays not taken in any
         calendar year may, with the prior approval of Mr. Markham's immediate
         superior, up to a maximum of five days, be carried over to the next
         year, but if not then taken by the last day of February in that year
         will lapse and cease to be available. No payment will be made by the
         Company during the continuance of this Agreement in lieu of holidays
         not taken.

8.2      Upon termination of this Agreement for whatever reason Mr. Markham
         shall be entitled to payment in lieu on a pro rata basis for any
         holidays not taken which have accrued in the calendar year in which the
         Date of Termination falls or, if appropriate, Mr. Markham shall repay
         to the Company any salary received in respect of holiday taken prior to
         the Date of Termination in excess of his proportionate entitlement. The
         payment will be calculated by multiplying the excess entitlement (as
         the case may be) by 1/260 of Mr. Markham's salary at that time.

9.       SICKNESS AND INJURY

9.1      If Mr. Markham is absent from work as a result of sickness or injury he
         will be entitled, subject to production, if requested, of medical
         certificates satisfactory to the Company during the first 52 weeks or
         any shorter period of such incapacity, to receive a sum equal to his
         fixed salary at the rate specified in clause 4 of this Agreement (less
         any Statutory Sick Pay) whether from the Company or through the
         Permanent Health Insurance Scheme. During this period, the Company will
         pay employer pension and national insurance contributions calculate on
         Mr. Markham's salary. If his incapacity continues for a period greater
         than 52 consecutive weeks, then Mr. Markham will be entitled thereafter
         to receive such proportion of his salary (if any) as the Company may in
         its absolute discretion see fit to pay to him until he is capable of
         fully performing and does resume his duties under this Agreement, or
         until the termination of Mr. Markham's employment in accordance with
         clause 14.2.6 below. For as long as he is a member of the Hickson UK
         Group Pension Scheme he
<PAGE>
         shall be entitled to his benefits under the Ill Health Early Retirement
         Insurance Scheme in accordance with the rules of that Scheme.

9.2      Mr. Markham agrees that if he is absent for a continuous period of more
         than two weeks or his performance at work give cause for concern to the
         Company, then he will at the expense of the Company and if directed to
         do so by the Board at any time undergo a medical examination by a
         medical practitioner nominated by the Company and that the Company
         shall be entitled to be supplied with and retain a copy of any medical
         report, diagnosis or prognosis made or produced in relation to any such
         medical examination and to discuss the same with the practitioner who
         produced such report, diagnosis or prognosis.

9.3      If Mr. Markham is absent from work by reason of injuries sustained
         wholly or partly as a result of actionable negligence, nuisance or
         breach of any statutory duty on the part of any third party other than
         any subsidiary or associate of the Company, the Company in its
         discretion may require Mr. Markham to take all reasonable steps to
         recover compensation including repayment of all sums paid to him by the
         Company under this clause in respect of such absence. Any such sums
         shall in turn be repaid by Mr. Markham when and to the extent that he
         recovers compensation for loss of earnings from that third party by
         action or otherwise less any reasonable costs incurred in recovering
         any such compensation.

10.      INTERESTS IN OTHER BUSINESSES

         Save with the written consent of Arch's Chief Financial Officer, Mr.
         Markham will not during the continuance of his employment be engaged or
         interested (except as the holder for investment of up to 20 per cent of
         any class of securities quoted or dealt in on a recognised stock
         exchange) either directly or indirectly in any business or occupation
         other than the business of the Company and its subsidiaries and
         associates.

11.      SHARE DEALINGS

11.1     Mr. Markham will comply with the requirements of section 324 of the
         Companies Act 1985 and will not act so as to commit an offence under
         Part V of the Criminal Justice Act 1993. Mr. Markham will abide by all
         applicable U.S. securities laws and the regulations promulgated
         thereunder.

11.2     During the continuance of his employment and, if later, until he ceases
         to be a director of the Company Mr. Markham will not (and will procure,
         so far as he is able, that his wife, dependent children and persons
         connected with him will not) deal or become or cease to be interested
         (within the meaning contained in Part I of Schedule 13 to the Companies
         Act 1985) in any shares or other securities of the Company or any
         subsidiary or associate of the Company except in accordance with the
         Company's Code of Practice in force from time to time in relation to
         such transactions, a copy of which is available from the Secretary of
         the Company.

11.3     During the continuance of his employment and, if later, until he ceases
         to be a director of the Company, Mr. Markham will notify the Company
         Secretary as soon as reasonably practicable of any dealing in the
         securities of the Company including the grant, acceptance, exercise or
         disposal of any option or other right or obligation to acquire or
         dispose of securities. The notification shall include the nature of the
         dealing, the nature and extent of Mr. Markham's interest in it, the
         date on which the
<PAGE>
         dealing was effected and the price, number (or amount) and class of
         securities. Mr. Markham will take all reasonable steps to notify the
         Company Secretary of any such dealing by persons connected with Mr.
         Markham and to ensure that such persons are aware of his obligation to
         notify such dealing and to secure their co-operation in discharging it.
         In addition to the details required above, the notification of any such
         dealing shall include the identity of the person connected with Mr.
         Markham.

11.4     For the purposes of this clause 11, "CONNECTED" has the meaning
         attributed to it by section 346 of the Companies Act 1985.

12.      CONFIDENTIALITY

12.1     Mr. Markham will not during the continuance of his employment or
         afterwards (unless authorised to do so by the Board or by a court of
         competent jurisdiction):

         12.1.1   use for his own benefit or the benefit of any other person;

         12.1.2   disclose to any person (other than fellow employees who have a
                  need to know in connection with their duties); or

         12.1.3   through any failure to exercise all due care and diligence
                  cause or permit any unauthorised disclosure (which he is
                  capable of preventing) of

         any confidential information of the Company or any of its subsidiaries
         or associates which he has obtained by virtue of his employment or in
         respect of which the Company or any associate of the Company is bound
         by an obligation of confidence to a third party. Confidential
         information shall include, without limitation, any information or
         knowledge relating to any other business carried on or under
         investigation by the Company and/or any of its subsidiaries or
         associates, lists or details of customers, information relating to the
         working of any product, processes of manufacture, its manufacturing
         plant, ideas, inventions, improvements or developments carried on or
         used by the Company or any subsidiary or associate, information
         relating to research projects, know-how, technology, designs, products,
         markets, prices, discounts, mark-ups, future business strategy,
         marketing, tenders, any price sensitive information, information
         concerning the Company's or any of its associate's intellectual
         property portfolio and strategy.

12.2     The restriction in this clause will not prevent Mr. Markham, after the
         Date of Termination, from using for his own or another's benefit, any
         information which becomes available to the public generally other than
         by reason of a breach by Mr. Markham of his obligations under this
         Agreement but any such use will be subject to the restrictions
         contained in clause 13 below.

13.      PROTECTION OF INTERESTS OF COMPANY ETC.

13.1     In this clause:

         13.1.1   "COMPETING BUSINESS" shall mean any business in the United
                  Kingdom, Italy, France, Spain, Australia, Venezuela, Brazil,
                  Mexico, Canada, Japan or the United States of America which
                  competes or which will compete with any business carried on at
                  the Date of Termination by the Company or any subsidiary or
                  associate of the Company in which Mr. Markham shall have
<PAGE>
                  been involved at any time during the 6 months up to and
                  including the Date of Termination;

         13.1.2   "RESTRICTED GOODS OR SERVICES" shall mean goods or services of
                  the same type as or similar to any goods or services supplied
                  by the Company or any subsidiary or associate of the Company
                  at the Date of Termination and of the same type as or similar
                  to those supplied by Mr. Markham on behalf of the Company or
                  any subsidiary or associate of the Company;

         13.1.3   references to acting directly or indirectly include (without
                  prejudice to the generality of that expression) references to
                  acting alone or jointly with or by means of any other person.

13.2     Until the expiration of 6 months from the Date of Termination Mr.
         Markham will not directly or indirectly:

         13.2.1   carry on or be interested in a competing business save that he
                  may hold for investment up to 20 per cent of any class of
                  securities quoted or dealt in on a recognised stock exchange;

         13.2.2   act as a consultant or employee or officer in any executive,
                  sales, marketing, research or technical support capacity in a
                  competing business SAVE that Mr. Markham shall be free to act
                  as a consultant or employee or officer in any competing
                  business so far as his duties or work shall relate exclusively
                  to work of a kind or nature with which he was not concerned to
                  any extent (other than de minimis) during the 6 months up to
                  and including the Date of Termination.

13.3     Until the expiration of 6 months from the Date of Termination Mr.
         Markham will not directly or indirectly:

         13.3.1   solicit, canvass or approach or endeavour to solicit, canvass
                  or approach on behalf of a competing business any person:

                  (A)      who, to the knowledge of Mr. Markham, was provided
                           with goods or services by the Company or any
                           subsidiary or associate of the Company at any time
                           during the 6 months up to and including the Date of
                           Termination; or

                  (B)      who, to the knowledge of Mr. Markham, was negotiating
                           with the Company or any subsidiary or associate of
                           the Company for the supply of goods or services at
                           any time during the 3 months up to and including the
                           Date of Termination;

                  for the purpose of offering to that person restricted goods or
                  services;

         13.3.2   supply on behalf of a competing business restricted goods or
                  services to any person who, to the knowledge of Mr. Markham,
                  was provided with goods or services by the Company or any
                  subsidiary or associate of the Company at any time during the
                  6 months up to and including the Date of Termination;

         13.3.3   solicit or entice away or endeavour to solicit or entice away
                  from the Company or any subsidiary or associate of the Company
                  on behalf of a
<PAGE>
                  competing business any person employed by the Company or any
                  subsidiary or associate of the Company at the Date of
                  Termination or thereafter in an executive, sales, marketing
                  research or technical support capacity with a view to inducing
                  that person to leave such employment and to act for another
                  person in the same or a similar capacity in relation to the
                  same field of work.

13.4     After the Date of Termination (for whatever reason and howsoever
         caused) Mr. Markham will not represent himself or permit himself to be
         held out as being in any way connected with or interested in the
         business of the Company or the business of any subsidiary or associate
         of the Company.

13.5     Each of the restrictions in sub-clauses 13.2.1, 13.2.2 and 13.3.1, and
         13.3.3 hereof are separate and severable and in the event of any such
         restriction (including the defined expressions in sub-clauses 13.1.1
         and 13.1.2) being determined as being unenforceable in whole or in part
         for any reason such unenforceability shall not affect the
         enforceability of the remaining restrictions or, in the case of part of
         a restriction being unenforceable, the remainder of that restriction.

13.6     The restrictions entered into by Mr. Markham in sub-clauses 12.1, 13.2,
         13.3 and 13.4 are given to the Company for itself and as trustee for
         each and any subsidiary or associate of the Company to which he has or
         shall have provided services under this Agreement and Mr. Markham
         agrees that he will at the request and cost of the Company enter into a
         further agreement with any such company whereby he will accept
         restrictions corresponding to the restrictions in this Agreement (or
         such of them as that company in its discretion shall deem appropriate).
         The Company declares that insofar as these restrictions relate to such
         subsidiaries or associates it holds the benefit of them as trustee. In
         exercising any right as trustee hereunder the Company shall be entitled
         to limit the action it takes to such action as it may, in its absolute
         discretion, consider reasonable.

13.7     When the Date of Termination follows a period of suspension from duties
         or is within one month of the end of such a period, then the 6 month
         periods referred to in this clause 13 shall be reduced by the length of
         the relevant period of suspension.

14.      TERMINATION

14.1     Either party will be entitled to terminate the employment of Mr.
         Markham by giving notice to the other in accordance with clause 2
         above.

14.2     The Company will be entitled to terminate the employment of Mr. Markham
         without notice if he:

         14.2.1   commits a serious or continues (after warning) any persistent
                  breach of his obligations to the Company or any subsidiary or
                  associate of the Company (whether under this Agreement or
                  otherwise);

         14.2.2   is guilty of conduct tending to bring himself or the Company
                  or any subsidiary or associate of the Company into disrepute;

         14.2.3   neglects, fails or refuses to carry out any of the duties
                  properly assigned to him under this Agreement;

         14.2.4   becomes bankrupt or compounds with his creditors; or
<PAGE>
         14.2.5   becomes prohibited by law from being a director or officer of
                  a company.

14.3     In order to investigate a complaint against Mr. Markham of misconduct
         and to allow the Company to carry out whatever investigations it deems
         appropriate, the Company may suspend Mr. Markham on full pay and other
         contractual benefits and require Mr. Markham up to three months:

         14.3.1   not to enter any premises of the Company or any subsidiary or
                  associate of the Company; and

         14.3.2   to abstain from contacting any customers, clients, employees
                  or suppliers of the Company or any subsidiary or associate of
                  the Company.

         Mr. Markham shall not be employed by or provide services to any third
         party during the period for which he is suspended pursuant to this
         clause.

14.4     The employment of Mr. Markham will terminate automatically on his
         achieving his 60th birthday.

14.5     [Intentionally Left Blank]

14.6     On the Date of Termination (for whatever reason and howsoever caused)
         Mr. Markham will promptly:

         14.6.1   resign (if he has not already done so) from all offices held
                  by him in the Company and its subsidiaries and associates; and

         14.6.2   deliver up to the Company all lists of customers,
                  correspondence, documents, credit cards and other property
                  (including but not limited to any car) belonging to the
                  Company or any of its subsidiaries or associates which may be
                  in his possession or under his control;

         and Mr. Markham irrevocably authorises the Company in his name and on
         his behalf to execute all documents and do all things necessary to
         effect the resignations referred to above, in the event of his failure
         to do so.

14.7     Any obligations of Mr. Markham under this Agreement which are expressed
         to continue after the Date of Termination shall continue in full force
         and effect notwithstanding the termination of his employment.

14.8     Mr. Markham agrees that for the purposes of the Employment Rights Act
         1996 the Company may apply any sums which may be due from the Company
         to Mr. Markham (including, without limitation, accrued salary and/or
         holiday pay) at the Date of Termination (for whatever reason and
         howsoever caused) against any sums which may be due from Mr. Markham to
         the Company.

14.9     The Company may in its discretion terminate Mr. Markham's employment
         immediately by giving him written notice pursuant to this clause
         together with payment of such sum as would have been payable by the
         Company to Mr. Markham as gross salary (excluding bonus) in respect of
         the period of notice specified in clause 2.2 calculated on the basis of
         the annual rate of salary applicable on the date notice is given. Any
         such payment (less any deductions which the Company may be required
<PAGE>
         to make including, without limitation, in respect of income tax) shall
         be accepted by Mr. Markham in full and final settlement of all claims
         which he may have against the Company or any subsidiary or associate of
         the Company arising out of his employment or its termination and shall
         be subject to receipt of the payments, if any, due under clause 14.10
         and under the side letter dated referred to in clause 18.1. The
         discretion to terminate Mr. Markham's employment given to the Company
         by this clause shall not preclude the Company from exercising any other
         right which it may have to terminate Mr. Markham's employment or by
         otherwise dismissing him without notice and paying such compensation as
         may be agreed or otherwise determined by a court of law.

14.10    Subject to clause 14.11, on the Date of Termination the Company will
         pay to Mr. Markham (in each case after deduction of tax):

         a)       a termination payment of L107,100;

         b)       a payment of L62,832 representing 2 years' pension benefit;
                  and

         c)       a payment equivalent to 2 years' car allowance (but not less
                  than L19,560).

         The payment in this clause 14.10 shall be made if Mr. Markham is
         relocated within Arch (the ultimate parent of the Company) to work
         outside of the United Kingdom or if a "Change in Control" (as defined
         in Appendix A hereto) occurs. In such a case, no further payments will
         be made under this clause 14.10.

         Except for amounts paid in accordance with this clause 14.10 and the
         notice period specified in clauses 2.2 and 14.9, Mr. Markham shall not
         be entitled to any other payments whatsoever from the Company, Arch or
         any subsidiary of any of them, whether bonus, salary, severance pay or
         other compensation, in connection with his termination or of employment
         following the Date of Termination (other than benefits under the
         Hickson UK Group Pension and Senior Pension Schemes and any unpaid
         amount due under the related side letter executed in September 2000).

14.11    The payments set out in clause 14.10 will not be made if Mr. Markham's
         employment is terminated by the Company pursuant to clause 14.2 or by
         Mr. Markham in breach of the terms of this Agreement.

15.      WAIVER OF RIGHTS

15.1     If:

         15.1.1   the employment of Mr. Markham is terminated:

                  (A)      by reason of the liquidation of the Company for the
                           purpose of amalgamation or reconstruction or the sale
                           of all or substantially all the assets of the
                           Company; or

                  (B)      as part of any arrangement for the amalgamation of
                           the undertaking of the Company not involving
                           liquidation or for the transfer of the whole or part
                           of the undertaking of the Company to any of its
                           subsidiaries or associates; and
<PAGE>
         15.1.2   Mr. Markham is offered employment of a similar nature with the
                  amalgamated or reconstructed or transferee company on terms
                  not generally less favourable to him than the terms of this
                  Agreement;

         Mr. Markham will have no claim against the Company or any subsidiary or
         associate of the Company in respect of that termination.

16.      DISCIPLINE AND GRIEVANCES

16.1     Arch's Chief Executive Officer will deal with any disciplinary issue
         concerning Mr. Markham.

16.2     If Mr. Markham is dissatisfied with any disciplinary decision or has
         any grievance relating to his employment, he should refer the matter to
         the Board and the reference will be dealt with by discussion and
         decision at a meeting of the Board.

17.      ADDITIONAL PARTICULARS

17.1     The following additional particulars are given for the purposes of the
         Employment Rights Act 1996:

         17.1.1   the previous employment of Mr. Markham with the Company counts
                  as part of Mr. Markham's continuous employment with the
                  Company and his period of continuous employment began on 6th
                  November 1995;

         17.1.2   except as otherwise provided by this Agreement, there are no
                  terms or conditions of employment relating to hours of work or
                  to normal working hours or to entitlement to holidays
                  (including public holidays) or holiday pay or to incapacity
                  for work due to sickness or injury or to pensions or pension
                  schemes or requiring Mr. Markham to work outside the United
                  Kingdom for a period of more than 30 consecutive days;

         17.1.3   there are no collective agreements which directly affect the
                  terms or conditions of Mr. Markham's employment.

18.      ENTIRE AGREEMENT

18.1     This Agreement, together with the side letter executed in September
         2000 from the Company to Mr. Markham, represents the entire
         understanding, and constitutes the whole agreement, in relation to its
         subject matter and supersedes any previous agreement between the
         parties with respect thereto and, without prejudice to the generality
         of the foregoing, excludes any warranty, condition or other undertaking
         implied at law or by custom.

18.2     Each party confirms that, except as provided in this Agreement, no
         party has relied on any representation or warranty or undertaking which
         is not contained in this Agreement and, without prejudice to any
         liability for fraudulent misrepresentation, no party shall be under any
         liability or shall have any remedy in respect of misrepresentation or
         untrue statement unless and to the extent that a claim lies under this
         Agreement.

18.3     No term of this Agreement is enforceable under the Contracts (Rights of
         Third Parties) Act 1999 by a person who is not a party to this
         Agreement.
<PAGE>
19.      OBLIGATIONS TO THIRD PARTIES

         Mr. Markham warrants that by virtue of entering into this Agreement and
         performing the duties set out in this Agreement he will not be in
         breach of any contract of service or for the provision of services or
         any partnership agreement and will, save as implied by law, be free
         from all agreements, arrangements or other restrictions restricting his
         right to compete with any person or to solicit clients or employees of
         any person or in any way restricting him from performing this Agreement
         in accordance with its terms.

20.      ASSIGNMENT

         The Company reserves the right forthwith on written notice to Mr.
         Markham to assign its rights and obligations under this Agreement to
         any subsidiary or associate of the Company and any reference to the
         Company in this Agreement shall thereafter be a reference to any such
         company; provided at the time of assignment the assignee is solvent
         after giving effect to such assignment.

21.      DATA PROTECTION

21.1     In this clause:

         21.1.1   "PERSONAL DATA" shall mean data which relates to Mr. Markham
                  whilst he is alive and from which data itself or from which
                  data and other information which is in the possession of, or
                  is likely to come into the possession of, the Company (or any
                  data processor instructed by the Company) Mr. Markham can be
                  identified. Such data includes any expression of opinion about
                  Mr. Markham and any indication of the intentions of the
                  Company or any other person in respect of Mr. Markham.

         21.1.2   "SENSITIVE PERSONAL DATA" shall mean personal data consisting
                  of information as to: the racial or ethnic origin of Mr.
                  Markham, his political beliefs, his religious beliefs or other
                  beliefs of a similar nature, whether he is a member of a trade
                  union (within the meaning of the Trade Union and Labour
                  Relations (Consolidation) Act 1992), his physical or mental
                  health or condition, his sexual life, the commission by him of
                  any offence, or any proceedings for any offence committed or
                  alleged to have been committed by him, the disposal of such
                  proceedings or the sentence of any court in such proceedings.

21.2     Personal data (including sensitive personal data) provided by Mr.
         Markham and relating to Mr. Markham and to Mr. Markham's employment
         with the Company will be processed in accordance with the principles of
         the applicable data protection legislation including the Data
         Protection Act 1998.

21.3     "Processing" means obtaining, recording or holding information or data
         (in hard copy and computer readable form) or carrying out an operation
         or set of operations on such information or data, including organising,
         adapting or altering the information or data, retrieving, consulting or
         using the information or data, disclosing the information or data by
         transmission, dissemination or otherwise making it available, or
         aligning, combining, blocking, erasing or destroying the information or
         data.

21.4     Personal data about Mr. Markham will only be used for lawful and fair
         purposes. It will only be processed to fulfil the obligations of the
         Company to Mr. Markham under this Service Agreement and/or for other
         purposes relating to or which may become
<PAGE>
         related to Mr. Markham's employment. Such processing will principally
         be for personnel, administrative, financial, regulatory or payroll
         purposes.

21.5     Mr. Markham agrees that personal data relating to him or to his
         employment with the Company may to the extent that is reasonably
         necessary in connection with his employment or the business of the
         Company:

         21.5.1   be collected and held (in hard copy and computer readable
                  form) and processed by the Company; and

         21.5.2   be disclosed or transferred to subsidiaries and associates of
                  the Company and their respective employees.

         This will include the disclosure of certain relevant data about
         employees to entities which provide benefits or services to employees
         of the Company or the Company. The identities of the relevant third
         parties can be requested from the Company Secretary.

21.6     Mr. Markham further agrees that the Company and its subsidiaries and
         associates may lawfully and fairly process sensitive personal data.

21.7     Mr. Markham's consent to the transfer and disclosure of personal data
         shall apply regardless of the country to which the data is to be
         transferred. Where data is transferred outside of the European Economic
         Area, the Company shall take reasonable steps to ensure his rights and
         freedoms in relation to the processing of the relevant personal data
         are adequately protected.

21.8     Mr. Markham is responsible for ensuring that any personal data which he
         may use or access during his employment is kept secure from
         unauthorised access or disclosure.

21.9     Where Mr. Markham uses the services of a third party for the
         performance of his duties to the Company, he agrees to take all
         reasonable steps to ensure that the third party complies with the above
         requirements of the Data Protection Act 1998.

21.10    Mr. Markham agrees to notify Arch's Chief Executive Officer of any
         actual or suspected breach of the above requirements which comes to his
         attention.

21.11    The Company will take all reasonable steps to ensure that personal data
         held about an employee is complete, accurate, up to date and not held
         for longer than necessary for the purposes for which it was collected.
         However, Mr. Markham is responsible for informing the Company Secretary
         of any changes to his personal data, including but not limited to,
         name, address, marital status, contact details, qualifications and next
         of kin.

22.      INVENTIONS

22.1     As part of, and in the normal course of, his duties under this
         Agreement Mr. Markham will be concerned to seek and pursue the adoption
         and development of new processes, products, designs, equipment,
         techniques and projects which could be used, made or undertaken by the
         Company or any subsidiary or associate of the Company.

22.2     If during his employment hereunder Mr. Markham in the course of his
         normal duties or other duties specifically assigned to him (whether or
         not during normal working hours) either alone or in conjunction with
         any other person:
<PAGE>
         22.2.1   originates any design, trade mark, logo, know how, database
                  (in each case whether registrable or not) or other work in
                  which copyright, design right, registered design, trade mark
                  right, database right or other intellectual property right
                  protection may subsist and/or

         22.2.2   makes, discovers or produces any invention, process,
                  improvement or development

         then he shall forthwith disclose the same to the Company and shall
         (subject to sub-clauses 22.2, 22.3, 22.4 and 22.5) regard himself in
         relation thereto as a trustee for the Company.

22.3     Mr. Markham hereby assigns wholly and absolutely the copyright, future
         copyright, design right and future design right and all other
         proprietary rights if any for the full term thereof throughout the
         world and to waive his moral rights and future moral rights, if any, in
         respect of all works written, originated, conceived or made by Mr.
         Markham (except only those copyright or design right works written,
         originated, conceived or made by him wholly outside his normal working
         hours hereunder and wholly unconnected with his service hereunder)
         during the period of his employment to the Company to hold absolutely
         including the right to sue for damages for past infringements.

22.4     Mr. Markham acknowledges that, for the purpose of section 2(1) of the
         Registered Designs Act 1949 as amended by the Copyright, Designs and
         Patents Act 1988, the Company shall be treated as the original
         proprietor of a design, where such design is created by him in the
         course of his employment.

22.5     Mr. Markham acknowledges that for the purpose of the Copyright and
         Rights in Databases Regulations 1997 (as from time to time amended,
         extended or re-enacted) the Company shall be treated as the maker of
         any such database, where such database is created by him in the course
         of his employment.

22.6     Any such invention, process, improvement or development will be the
         absolute property of the Company (except to the extent, if any,
         provided otherwise by section 39 of the Patents Act 1977) and Mr.
         Markham will, if and when required by the Company (whether during the
         continuance of his employment or afterwards) and at its expense, apply,
         or join with the Company in applying, for letters patent or other
         protection in any part of the world for any invention process or
         development.

22.7     Mr. Markham agrees and undertakes that he will execute such deeds or
         documents and do all such acts and things as may be necessary or
         desirable to substantiate and maintain the rights of the Company in
         respect of the matters referred to in sub-clauses 22.1 to 22.4
         (inclusive).

22.8     Mr. Markham irrevocably appoints the Company as his attorney in his
         name and on his behalf to execute all documents and do all things
         required in order to give full effect to the provisions of this clause.

23.      NOTICES

23.1     Any Notice to be given under this Agreement will be in writing, in
         English, and will be deemed to be sufficiently served by one party on
         the other if it is either delivered personally or is sent by prepaid
         first class post (airmail if posted to or from a place
<PAGE>
         outside the United Kingdom) and addressed to the party to whom it is to
         be given, in the case of Mr. Markham at his last known residence and in
         the case of the Company at its registered office, or sent by facsimile
         to the facsimile number of the addressee which is specified in clause
         23.2 below or, if the addressee notifies another facsimile number, to
         that facsimile number.

23.2     The facsimile numbers referred to above are as follows:

         In the case of Mr. Markham

         Facsimile:  (0) 1226 208558

         In the case of the Company

         Facsimile:  (0)1977 668060

         With a copy to:            Corporate Secretary
                                    Arch Chemicals, Inc.
                                    501 Merritt 7
                                    Norwalk, CT  06851
                                    Fax:  (203) 229-2613

23.3     A notice shall take effect from the time it is deemed to be received as
         follows:

         23.2.1   in the case of a posted letter on the day (excluding Sundays
                  and public holidays) following that on which it was posted or
                  on the seventh day after posting, if posted to or from a place
                  outside the United Kingdom;

         23.2.2   in the case of facsimile, on production of a transmission
                  report from the machine from which the facsimile was sent
                  which indicates that the facsimile was sent in its entirety to
                  the facsimile number of the recipient.

24.      GOVERNING LAW

24.1     This Agreement shall be governed by, and construed in accordance with,
         English law.

24.2     Each party irrevocably agrees for the benefit of the Company that the
         Courts of England shall have exclusive jurisdiction in relation to any
         claim, dispute or difference concerning this Agreement and any matter
         arising therefrom.

24.3     Each party irrevocably waives any right that it may have to object to
         an action being brought in those Courts, to claim that the action has
         been brought in an inconvenient forum, or to claim that those Courts do
         not have jurisdiction.

IN WITNESS whereof the parties hereto have executed this Agreement as a Deed on
the day and year first above written.
<PAGE>
SIGNED AS A DEED by JOHN H       )
MARKHAM in the presence of:      )
                                       /s/J.H. Markham............
                                       ---------------------------
                                          [Signature of employee]

[Signature of Witness]          /s/Barbara Purdy
[Name of Witness (in print)]    ---------------------------
[Address of Witness]

SIGNED AS A DEED by HICKSON                )
INTERNATIONAL PLC acting by two of         )
its directors/a director and its secretary )

                                       /s/Sarah A. O'Connor.......
                                       ---------------------------
                                                [Director]

                                       /s/Paul J. Craney..........
                                       ---------------------------
                                                [Director]
<PAGE>
                         APPENDIX A TO SERVICE AGREEMENT
                             DATED 13 SEPTEMBER 2000
              BETWEEN HICKSON INTERNATIONAL PLC AND MR. J. MARKHAM

            "Change in Control" means:

            (i) Arch ceases to be, directly or indirectly, owned of record by at
least 1,000 shareholders;

            (ii) A person, partnership, joint venture, corporation or other
entity, or two or more of any of the foregoing acting as a "person" within the
meaning of Section 13(d)(3) of the U.S. Securities Exchange Act of 1934, as
amended (the "Act"), other than Arch, a majority-owned subsidiary of Arch or an
employee benefit plan (or the plan's related trust) of Arch or such subsidiary,
become(s) the "beneficial owner" (as defined in Rule 13d-3 under such Act) of
20% or more of the then outstanding voting stock of Arch Chemicals;

            (iii) During any period of two consecutive years, individuals who at
the beginning of such period constitute Arch's Board of Directors (together with
any new Director whose election by Arch's Board of Directors or whose nomination
for election by Arch's shareholders was approved by a vote of at least
two-thirds of the Directors then still in office who either were directors at
the beginning of such period or whose election or nomination for election was
previously so approved) cease for any reason to constitute a majority of the
directors then in office;

            (iv) All or substantially all of the business of Arch is disposed of
pursuant to a merger, consolidation or other transaction in which Arch is not
the surviving corporation or Arch combines with another company and is the
surviving corporation (unless the shareholders of Arch immediately following
such merger, consolidation, combination, or other transaction beneficially own,
directly or indirectly, more than 50% of the aggregate voting stock or other
ownership interests of (x) the entity or entities, if any, that succeed to the
business of Arch or (y) the combined company) or

            (v) Approval by Arch's shareholders of (i) a sale of all or
substantially all the assets of Arch or (ii) a liquidation or dissolution of
Arch.

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