ARCH SUPPLEMENTAL CONTRIBUTING EMPLOYEE OWNERSHIP PLAN
Arch Chemicals, Inc. ("Arch") hereby establishes a Supplemental Contributing Employee Ownership Plan (the
"Plan" or "SCEOP"), effective February 8, 1999 or, if later, the effective date of the spin-off of Arch from Olin
Corporation (the "Effective Date"). The Plan is intended to be an unfunded, nonqualified deferred compensation
plan for certain management and highly compensated employees, as described in Section 201(2) and 301(a)(3)
of the Employee Retirement Income Security Act ("ERISA").
Arch is a participating employer in the multiple employer plan known as the Olin Corporation Contributing
Employee Ownership Plan (as from time to time amended, the "CEOP"). The purpose of this Plan is to permit
certain executive employees of Arch, whose contributions to the CEOP are limited under Sections 401(a)(17) of
the Internal Revenue Code of 1986 and the regulations promulgated thereunder (the "Code"), with certain
supplemental benefits to make up for such Code-imposed limitations.
DEFINITIONS AND GENERAL PROVISIONS
1.1 Except as otherwise provided herein, the terms defined in the CEOP are used herein with the meanings
ascribed to them in the CEOP. In addition, when used herein, the following definitions shall apply:
(a) "Arch Phantom Units" means phantom units of the CEOP's Arch Common Stock Fund credited under the
SCEOP, such units deemed to consist of both Arch Common Stock and cash.
(b) "CEOP Percentage" means, with respect to a SCEOP Participant, the annual percentage by which such
Participant reduces his Maximum Eligible Compensation on either a before-tax or after-tax basis in calculating
Contributions made to the CEOP; provided, however, that, if a Participant's CEOP percentage exceeds six
percent (6%), the Participant may elect, for purposes of this Plan, to limit the CEOP percentage used under this
Plan to six percent (6%).
(c) "Company" or "Arch" means Arch Chemicals, Inc. and its affiliated companie