EX-10.73 5 dex1073.htm EMPLOYMENT LETTER AGREEMENT DATED AS OF SEPTEMBER 29, 2010 Nalco Company 1601 West Diehl Road Naperville, IL 60563-1198 phone 630.305.2801 fax 630.305.1890 www.nalco.com September 29, 2010 CONFIDENTIAL Dear Kathryn: