SUPPLEMENTAL CONTRIBUTING EMPLOYEE OWNERSHIP PLAN
As amended through March 1, 2001
Arch Chemicals, Inc. ("Arch") hereby establishes a Supplemental Contributing Employee Ownership Plan (the
"Plan" or "SCEOP"), effective February 8, 1999, the effective date of the spin-off of Arch from Olin Corporation
(the "Effective Date"). The Plan is hereby restated effective March 1, 2001. 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").
Prior to March 1, 2001, Arch was a participating employer in the multiple employer plan known as the Olin
Corporation Contributing Employee Ownership Plan (the "Olin CEOP"). Effective as of March 1, 2001, Arch
withdrew as a participating employer from the Olin CEOP and, effective as of the same date, adopted its own
defined contribution plan known as the Arch Chemicals, Inc. Contributing Employee Ownership Plan (the "Arch
CEOP") to which it transferred all account balances attributable to Arch participants in the Olin CEOP. For
purposes of this Plan, the term "CEOP" shall refer to the Olin CEOP prior to March 1, 2001, and to the Arch
CEOP on and after March 1, 2001.
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 shares of the CEOP's Arch Common Stock Fund credited under the
(b) "CEOP Percentage" means