All positions are "safety-sensitive" unless a position, or positions, is/are identified as "low-exposure" or "comparable-to-designated" in Attachment 1 to this exhibit. If during the course of this contract, ExxonMobil determines that additional positions require treatment as "low-exposure" or "comparable-to-designated," ExxonMobil may at its sole discretion, after notifying Contractor of a change, or changes, modify Attachment 1. ExxonMobil must confirm the modification in writing.