EX-99 3 nbpex-99_3.txt AUDITOR LETTER Exhibit 99.3 Arthur Andersen LLP Suite 700 2301 McGee Street Kansas City, MO 64108-2604 Tel: 816 802 5200 Office of the Chief Accountant Securities and Exchange Commission 450 Fifth Street, N.W. Washington, D.C. 20549 February 11, 2002 Dear Sir/Madam: We have read paragraphs (a), (b),(d), and (e) of Item 4 included in the Form 8-K dated February 11, 2002, of Northern Border Partners L.P. to be filed with the Securities and Exchange Commission and are in agreement with the statements contained therein. Very truly yours, /s/ Arthur Andersen LLP Copy to: Mr. Jerry L. Peters Chief Financial and Accounting Officer Northern Border Partners, L.P.