EX-99.1 3 b46040bpexv99w1.txt JOINT FILING UNDERTAKING EXHIBIT 99.1 JOINT FILING UNDERTAKING The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to this Schedule 13D to evidence the agreement of the below-named parties, in accordance with the rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule jointly on behalf of each such party. The execution and filing of this agreement shall not be construed as an admission that the below-named parties are a group, or have agreed to act as a group. Dated: March 28, 2003 BERKSHIRE FUND V, LIMITED PARTNERSHIP By: Fifth Berkshire Associates LLC, its General Partner By: /s/ Robert J. Small ------------------------------------ Name: Robert J. Small Title: Managing Director BERKSHIRE FUND VI, LIMITED PARTNERSHIP By: Sixth Berkshire Associates LLC, its General Partner By: /s/ Robert J. Small ------------------------------------ Name: Robert J. Small Title: Managing Director BERKSHIRE INVESTORS LLC By: /s/ Robert J. Small ------------------------------------ Name: Robert J. Small Title: Managing Director BERKSHIRE PARTNERS LLC By: /s/ Robert J. Small ------------------------------------ Name: Robert J. Small Title: Managing Director GREENBRIAR EQUITY FUND, L.P. By: Greenbriar Equity Capital, L.P., its general partner By: Greenbriar Holdings LLC, its general partner By: /s/ Joel S. Beckman ------------------------------------ Name: Joel S. Beckman Title: Managing Member GREENBRIAR CO-INVESTMENT PARTNERS, L.P. By: Greenbriar Holdings LLC its general partner By: /s/ Joel S. Beckman ------------------------------------ Name: Joel S. Beckman Title: Managing Member GREENBRIAR EQUITY GROUP, LLC By: /s/ Joel S. Beckman ------------------------------------ Name: Joel S. Beckman Title: Managing Member