AMENDMENTS TO
            NATIONAL FUEL GAS COMPANY AND PARTICIPATING SUBSIDIARIES
                            EXECUTIVE RETIREMENT PLAN

         I, the undersigned,  being duly authorized and empowered by resolutions
adopted by the National  Fuel Gas Company  Board of  Directors on September  16,
1999,  do  hereby  amend  the  National  Fuel  Gas  Company  and   Participating
Subsidiaries  Executive Retirement Plan ("Plan"),  effective September 16, 1999,
as follows:

         1.       Section 2.9 shall be amended and restated to read as follows:
                  "Company  means  National  Fuel  Gas  Company  and each of the
                   -------
                  following   subsidiaries,   which  participate  in  the  Plan:
                  National Fuel Gas Distribution Corporation,  National Fuel Gas
                  Supply  Corporation,  Seneca Resources  Corporation,  National
                  Fuel Resources,  Inc., Penn-York Energy Corporation and Empire
                  Exploration,  Inc., each of which has adopted or has indicated
                  that it will adopt the Plan."

         2.       Section 2.18 shall be amended and restated to read as follows:
                  "Vesting  (a)  With  respect  to  a  Member's   benefit  which
                   -------
                  compensates  for any  reduction in Basic Pension Plan benefits
                  resulting  from  Internal  Revenue  Code  limitations   and/or
                  participation  in  the  National  Fuel  Gas  Company  Deferred
                  Compensation  Plan  (frequently  called a  "tophat"),  vesting
                  occurs in the same  manner as vesting  occurs  under the Basic
                  Pension Plan.





                  (b) With respect to a Member's supplemental benefit portion of
                  the Plan, vesting occurs on the latter of (i) the first of the
                  month  coinciding  with  or  immediately  following  his  55th
                  birthday  or (ii) the date on which the Member  has  completed
                  five Years of Service with a Company.  A "Vested"  Member is a
                  Member with respect to whom "Vesting" has occurred."

         3.       Article  3 shall be  revised  by adding a new  Section  3.0 as
                  follows:

                      "3.0  Introduction.  The Plan  provides  a  Member  with a
                      two-part benefit.  The first part will make a Member whole
                      for any reduction in the regular pension he receives under
                      the Basic Pension Plan  resulting  from  Internal  Revenue
                      Code limitations  and/or his participation in the National
                      Fuel  Gas  Company  Deferred  Compensation  Plan.  This is
                      frequently  called  a  "tophat."  The  second  part  is  a
                      supplemental   benefit   which   provides  an   additional
                      retirement benefit to the Basic Pension Plan."





         4.       Section  3.4(a)  shall  be  amended  and  restated  to read as
                  follows:

                      "(a)  Adjusted  Basic Pension Plan Benefit Base equals the
                      Benefit Base as  determined  under the Basic  Pension Plan
                      without  reduction on account of Benefit  Limitations  and
                      adjusted  as if  deferrals  under  the  National  Fuel Gas
                      Company Deferred  Compensation Plan were not excluded from
                      the  definition  of Final  Average  Pay  under  the  Basic
                      Pension  Plan,  and  multiplied by the  appropriate  Early
                      Retirement Percentage,  if applicable,  as provided for in
                      Section 3.5 of the Basic Pension Plan. (The Adjusted Basic
                      Pension Plan Benefit  minus the Basic Pension Plan benefit
                      equals  the  "tophat"   portion  of  the  Plan's  two-part
                      benefit.)"

         5.       Section  3.4(c)  shall be amended by deleting  the first three
                  sentences in their entirety and restating the fourth  sentence
                  to read as follows:

                      "At early retirement, the supplemental benefit is equal to
                      a percentage of the plan benefit normally paid at age 65."

                  The remainder of Section 3.4(c) shall remain unchanged.
         6.       In all other respects, the Plan shall remain unchanged.

                                                     NATIONAL FUEL GAS COMPANY

Dated:  October 1, 1999                              /s/ P.C. Ackerman
                                                    ------------------------
                                                    P.C. Ackerman
                                                    President