EXHIBIT 10.23 EXECUTIVE SEVERANCE AGREEMENT As of December 31, 1998, each of the following officers have entered into an Executive Severance Agreement identical to the form of Executive Severance Agreement that is incorporated by reference from Exhibit 10.18 of the Company's Form 8-K filed March 5, 1997: Gary S. Bernard Donald R. Britton Steven D. Crandall David A. Dams Gregory K. Daniels E. Philip Farley Mark F. Furlong Ralph W. Garlick Joseph T. Keating Kenneth C. Krei Larry S. Magnesen William K. McGowan Ronald C. Mishler Michael D. Schaver David C. Schneider Daniel W. Terpsma Michelle L. VanDyke Michael J. Whalen