ARCH SENIOR EXECUTIVE PENSION PLAN
Article I. The Plan
1.1 Establishment of Plan. Arch Chemicals, Inc. (the "Company" or "Arch") hereby establishes a non-qualified
deferred compensation plan known as the Arch Senior Executive Pension Plan for the benefit of certain salaried
employees of Arch and other Employing Companies who may be eligible to participate. The Plan is effective
February 8, 1999 or, if later, the effective date of the spin-off of Arch from Olin Corporation (the "Effective
Date"). For purposes of this Plan, an "Employing Company" means any company which has adopted this Plan
and is included within the definition of an Employing Company under the terms of the Arch Chemicals Employees'
Pension Plan and any other qualified defined benefit plans maintained by Arch (collectively, the "Qualified Plans").
1.2 Purpose. The purpose of this Plan is to attract and retain a management group capable of assuring Arch's
future success by providing them with supplemental retirement income under this Plan. This Plan is intended to be
an unfunded, nonqualified deferred compensation plan for select management employees.
Article II. Eligibility
2.1 Participation. Any Arch Employee whose job is rated at 2,000 Hay Points (or the equivalent) or more, and
who is selected by the Board of Directors of the Company or the Compensation Committee of the Board
(referred to in this Plan as the "Selection Committee" or "Compensation Committee"), shall participate in the Plan
(a "Participant"). As provided hereinafter, the Selection Committee shall also have the power to remove any
Participant from the Plan, whether or not he or she has begun to receive benefits hereunder.
For purposes of this Plan, an "Arch Employee" includes (i) any employee who is defined as an Arch Employee
within the meaning of the Employee Benefits Allocation Agreement dated as of February 8, 1999 by and
between Arch and Olin Corporation ("Olin"), as well as (ii) any salaried employee hired by Arch after the