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                                                          Exhibit 10(iii)A(2)(f)

                                 APPENDIX E


E.1      Eligible Individual        Brock A. Hattox

E.2      Effective Date Pursuant to Section 2.1(b), the Eligible Individual's
date of participation shall be September 18, 1996.

E.3      Special  Provisions  The  following  special  provision  shall apply to
the Eligible Individual's participation in the Plan.

         (a) The Eligible  Individual  will  qualify as a Vested  Terminee if he
completes  5  years  of  employment  with  NSI  from  September  9,  1996 to his
Termination Date.

         (b) The Eligible Individual will be eligible for Early Retirement under
Sections  1.1(a)(2) and 3.3 upon attainment of age 60 while actively employed by
NSI (at which time he will have more than 10 years of  service),  provided  that
his Early Retirement Accrued Pension shall be calculated based upon his Credited
Service and Eligible Service at his date of Retirement.

Except as  otherwise  specifically  provided in this  Appendix  E, the  Eligible
Individual's  benefits  under the Plan shall be determined in the same manner as
for other participants.