Document:

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                                                                   Exhibit 10.34

                       AMENDMENT TO EMPLOYMENT AGREEMENT
                       ---------------------------------
                  BETWEEN LYDALL, INC. AND RAYMOND GRUPINSKI
                  ------------------------------------------
                              Dated March 1, 2000
                              -------------------

     This is an Amendment of the Employment Agreement between Lydall, Inc. and
Raymond Grupinski dated March 1, 2000. This Amendment is made in consideration
of the mutual agreements and promises hereinafter set forth and for other good
and valuable consideration.

     All provisions of the Employment Agreement are reaffirmed and will remain
in full force and effect except that the following new section shall be added as
noted:

     9.   Benefits Upon Termination Without Cause or For Good Reason (Change of
          ---------------------------------------------------------------------
          Control).
          ---------

               (h)  The Company will pay the Executive a car allowance, in an
          amount equal to Executive's monthly lease allowance at the time of
          termination, per month for 24 months following termination of the
          Executive's employment to replace the Company-leased automobile, which
          leased automobile will be returned to the Company by the Executive on
          the date of termination of the Executive's employment.

     This amendment will be effective as of August 1, 2000.

               IN WITNESS WHEREOF, Lydall, Inc. and Raymond Grupinski have
caused this Amendment to the Agreement to be executed in duplicate.

LYDALL, INC.

By
   ----------------------                            ---------------------
        Walter A. Ruschmeyer                         Raymond Grupinski
         Executive Vice President -
            Finance and Administration,
            Chief Financial Officer<PAGE>

                                                                   Exhibit 10.35

                       AMENDMENT TO EMPLOYMENT AGREEMENT
                       ---------------------------------
                     BETWEEN LYDALL, INC. AND BILL FRANKS
                     ------------------------------------
                              Dated March 1, 2000
                              -------------------

     This is an Amendment of the Employment Agreement between Lydall, Inc. and
Bill Franks dated March 1, 2000. This Amendment is made in consideration of the
mutual agreements and promises hereinafter set forth and for other good and
valuable consideration.

     All provisions of the Employment Agreement are reaffirmed and will remain
in full force and effect except that the following new section shall be added as
noted:

     9.   Benefits Upon Termination Without Cause or For Good Reason (Change of
          ---------------------------------------------------------------------
          Control).
          ---------

               (h)  The Company will pay the Executive a car allowance, in an
          amount equal to Executive's monthly lease allowance at the time of
          termination, per month for 24 months following termination of the
          Executive's employment to replace the Company-leased automobile, which
          leased automobile will be returned to the Company by the Executive on
          the date of termination of the Executive's employment.

     This amendment will be effective as of August 1, 2000.

               IN WITNESS WHEREOF, Lydall, Inc. and Bill Franks have caused this
Amendment to the Agreement to be executed in duplicate.

LYDALL, INC.

By
   ----------------------                            ---------------------
        Walter A. Ruschmeyer                         Bill Franks
         Executive Vice President -
            Finance and Administration,
            Chief Financial Officer<PAGE>

                                                                   Exhibit 10.36

                       AMENDMENT TO EMPLOYMENT AGREEMENT
                       ---------------------------------
                  BETWEEN LYDALL, INC. AND LISA KRALLIS-NIXON
                  -------------------------------------------
                              Dated March 1, 2000
                              -------------------

     This is an Amendment of the Employment Agreement between Lydall, Inc. and
Lisa Krallis-Nixon dated March 1, 2000. This Amendment is made in consideration
of the mutual agreements and promises hereinafter set forth and for other good
and valuable consideration.

     All provisions of the Employment Agreement are reaffirmed and will remain
in full force and effect except that the following new section shall be added as
noted:

     9.   Benefits Upon Termination Without Cause or For Good Reason (Change of
          ---------------------------------------------------------------------
          Control).
          ---------

               (h)  The Company will pay the Executive a car allowance, in an
          amount equal to Executive's monthly lease allowance at the time of
          termination, per month for 24 months following termination of the
          Executive's employment to replace the Company-leased automobile, which
          leased automobile will be returned to the Company by the Executive on
          the date of termination of the Executive's employment.

     This amendment will be effective as of August 1, 2000.

               IN WITNESS WHEREOF, Lydall, Inc. and Lisa Krallis-Nixon have
caused this Amendment to the Agreement to be executed in duplicate.

LYDALL, INC.

By
   ----------------------                            ---------------------
        Walter A. Ruschmeyer                         Lisa Krallis-Nixon
         Executive Vice President -
            Finance and Administration,
            Chief Financial Officer<PAGE>

                                                                    Exhibit 4(A)

                      FISCAL AND PAYING AGENCY AGREEMENT
                      ----------------------------------

          THIS AGREEMENT dated as of April 17, 2000 between Sierra Pacific
Resources, a corporation organized under the laws of the State of Nevada (the
"Company"), and Bankers Trust Company, a New York banking corporation as fiscal
and paying agent (the "Agent").

          Section 1.  Appointment of Agent.  The Company proposes to issue from
                      --------------------
time to time its unsecured, unsubordinated Notes (the "Notes").  The Company
hereby appoints the Agent to act, on the terms and conditions specified herein,
as fiscal and paying agent for the Notes.

          Section 2.  Amount Unlimited; Execution.
                      ---------------------------

          (a)  The Notes shall be issuable in series.  The aggregate principal
amount of Notes which may be issued hereunder is unlimited.

          (b)  Each Note shall be executed on behalf of the Company by the
manual or facsimile signature of an Authorized Representative (as defined in
Section 3 hereof) of the Company.

          Section 3.  Authorized Representatives.  From time to time the Company
                      --------------------------
will furnish the Agent with a certificate or similar form of evidence of the
Company demonstrating the incumbency of officers authorized to execute Notes and
Authentication Orders (as defined in Section 4 hereof) on behalf of the Company
(an "Authorized Representative").  Until the Agent receives a subsequent
incumbency certificate or similar form of evidence of the Company, the Agent
shall be entitled to rely on the last such certificate or similar form of
evidence delivered to it for purposes of determining the Authorized
Representatives.  Any Note bearing the manual or facsimile signature of a person
who is an Authorized Representative on the date such signature is affixed shall
bind the Company after the completion and registration thereof by the Agent,
notwithstanding that such person shall have ceased to hold office on the date
such Note is authenticated and delivered by the Agent.

          Section 4.  Authentication Orders; Completion, Authentication and
                      -----------------------------------------------------
                      Delivery of Notes.
                      -----------------

          (a)  The Notes shall be issued by the Agent only upon receipt from the
Company of an order (an "Authentication Order") with respect to a series of
Notes, which shall be accompanied by the proposed form of the Notes of such
series and, to the extent not set forth in such proposed form of Note, shall
include:
<PAGE>

               (i)    the designation of the Notes of the series (which may be
               part of a series of Notes previously issued);

               (ii)   any limit on the aggregate principal amount of the Notes
               of the series that may be authenticated and delivered hereunder
               (except for Notes authenticated and delivered upon registration
               of transfer of, or in exchange for, or in lieu of, other Notes of
               the series);

               (iii)  any date or dates on which the principal of the Notes of
               the series is payable;

               (iv)   the method by which the rate or rates at which the Notes
               shall bear interest shall be determined; the date or dates from
               which such interest shall be payable (each an "Interest Payment
               Date") and the record dates for the determination of holders to
               whom interest is payable; and the basis on which interest is to
               be calculated;

               (v)    the place or places where the principal of and any
               interest on the Notes shall be payable;

               (vi)   the price or prices at which, the period or periods within
               which and the terms and conditions upon which Notes of the series
               may be redeemed, in whole or in part;

               (vii)  the obligation, if any, of the Company to redeem, purchase
               or repay Notes of the series pursuant to any mandatory
               redemption, sinking fund or analogous provisions or at the option
               of a holder thereof and the price or prices at which and the
               period or periods within which and the terms and conditions upon
               which Notes shall be redeemed, purchased or repaid, in whole or
               in part, pursuant to such obligation;

               (viii) the denominations in which Notes shall be issuable;

               (ix)   if other than the principal amount thereof, the portion of
               the principal amount of Notes which shall be payable upon
               declaration of acceleration of the maturity thereof;

               (x)    any restrictions on sale, resale, pledge or any other
               transfer of the Notes; and

               (xi)   whether the Notes will be in the form of a global
               security.

<PAGE>

          (b)  Upon receipt of such Authentication Order with respect to the
Notes, the Agent shall prepare or cause to be prepared, the necessary Notes in
the form attached hereto as Exhibit A and, in accordance with the Authentication
                            ---------
Order, shall:

               (i)    complete each Note as to its Registered Holder and
               principal amount;

               (ii)   record each Note in a Note Register to be maintained by
               the Agent hereunder;

               (iii)  cause each Note to be manually authenticated by any one of
               the officers or employees of the Agent duly authorized and
               designated by it for such purpose; and

               (iv)   deliver each Note.

          Section 5.  Reliance on an Authentication Order.  The Agent shall
                      -----------------------------------
incur no liability to the Company in acting hereunder on instructions which the
recipient believed in good faith to have been given by an Authorized
Representative.

          Section 6.  Company's Representations and Warranties.  The
                      ----------------------------------------
Authentication Order given to the Agent in accordance with Section 4 hereof
shall constitute a continuing representation and warranty to the Agent by the
Company that the issuance and delivery of the Notes which are the subject
thereof have been duly and validly authorized by the Company and that the Notes,
when completed, authenticated and delivered pursuant hereto, will constitute the
legal, valid and binding obligations of the Company.

          Section 7.  Payment of Note Interest; Interest Payment Dates; Record
                      --------------------------------------------------------
Dates.  All interest payments in respect of the Notes will be made by the Agent
-----
to the Registered Holders in whose names Notes are registered at the close of
business on the record date specified in the Notes of such series (whether or
not a New York City Business Day) next preceding each Interest Payment Date
(each a "Record Date").  Notwithstanding the foregoing, if so specified in the
Notes of such series, if the original issue date or date of transfer of any Note
occurs either on an Interest Payment Date or between a Record Date and the next
succeeding Interest Payment Date, the first payment of interest on any such Note
will be made on the Interest Payment Date following the next succeeding Record
Date.  Unless otherwise specified in an Authentication Order with respect to a
particular series of Notes or in the proposed form of Notes of that series, all
interest payments on the Notes will be made at the office of the Agent located
at Four Albany Street, New York, New York 10006-1515, or, at the option of the
Agent may be made by check of the Agent mailed to the Registered Holders, as
such Registered Holders appear on the Record Date in the Note Register referred
to in Section 12 hereof, or to such other address in the United States as any
Registered Holder shall designate to the Agent in writing not later than the
relevant Record Date; provided, however, that in the case of Notes held by a
                      --------  -------
depository or its nominee,

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<PAGE>

payments of principal and interest shall be made by wire transfer of immediately
available funds to an account designated by such depository.

          Section 8.   Payment of Note Principal.  The Agent will pay the
                       -------------------------
principal amount of each Note at maturity, together with accrued interest due at
maturity (unless the maturity date is an Interest Payment Date), if any, only
upon presentation and surrender of such Note on or after the maturity date
thereof.  The Agent will forthwith cancel and destroy each such Note.  If the
maturity date is an Interest Payment Date, interest will be paid in the usual
manner.

          Section 9.   Information Regarding Amounts Due.  Promptly following
                       ---------------------------------
each Record Date, the Agent will advise the Company of the amount of interest
due on the following Interest Payment Date.  The Agent will advise the Company
by the fifteenth day prior to each payment date of the principal of and accrued
interest to be paid on Notes maturing on the next succeeding payment date.

          Section 10.  Availability of Funds.  The Company shall assure that
                       ---------------------
funds are available to the Agent not later than 11:00 a.m. New York City time on
each Interest Payment Date and on each maturity date of any Note, in immediately
available funds sufficient to pay all accrued interest on, and/or the principal
of any such Note, as the case may be.

          Section 11.  Amendments and Waivers.  This Agreement and the
                       ----------------------
provisions of Notes of one or more series issued pursuant hereto may be amended
or waived in the manner and with the effect as may be specified in the terms of
Notes of such series.

          Section 12.  Registration, Transfer, Exchange, Persons Deemed Owners.
                       -------------------------------------------------------

          (a)  The term "Note Register" shall mean the definitive record
maintained by the Agent in which shall be recorded the names, addresses and
taxpayer identifying numbers of Registered Holders of the Notes, the Note
numbers and original issue dates thereof and details with respect to the
transfers and exchange of Notes.

          (b)  The Agent shall register the transfer of any Note and/or effect
the exchange of any Note or Notes for Notes of other authorized denominations
only in accordance with the terms and conditions of such Note.

          Section 13.  Application of Funds; Return of Unclaimed Funds.  Until
                       -----------------------------------------------
used or applied as herein provided and except as otherwise provided in the terms
of the Notes, all funds made available to the Agent hereunder shall be held for
the purposes for which they were received but need not be segregated from other
funds except to the extent required by law.

          Section 14.  Liability.  Neither the Agent nor its officers or
                       ---------
employees shall be liable for any act or omission hereunder except in the case
of gross negligence or willful

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<PAGE>

misconduct. The duties and obligations of the Agent, its officers and employees
shall be determined by the express provisions of this Agreement and they shall
not be liable except for the performance of such duties and obligations as are
specifically set forth herein and no implied covenants shall be read into this
Agreement against them. The Agent may consult with counsel and shall be fully
protected in any action taken in good faith in accordance with the advice of
counsel. Neither the Agent nor its officers or employees shall be required to
ascertain whether any issuance or sale of Notes (or any amendment or termination
of this Agreement) has been duly authorized or is in compliance with any other
agreement to which the Company is a party (whether or not the Agent is also a
party of such other agreement). In acting under this Agreement or in connection
with the Notes, the Agent is acting solely as agent of the Company and shall not
assume any relationship of agency of trust for or with any Noteholder, except
that all funds held by the Agent for payment of principal of or interest on the
Notes shall be held in trust by it and applied to payments or the Notes subject
to the limitations set forth herein and in the terms of the Note.

          Section 15.  Indemnification.  The Company agrees to indemnify and
                       ---------------
hold harmless the Agent, its directors, officers, employees and agents from and
against any and all liabilities (including liability for penalties), losses,
claims, damages, actions, suits, judgments, demands, costs and expenses
(including reasonable legal fees and expenses) relating to or arising out of or
in connection with its or their performance under this Agreement, except to the
extent that they are caused by the gross negligence or willful misconduct of the
Agent.  The foregoing indemnity includes, but is not limited to, any action
taken or omitted in good faith within the scope of this Agreement upon
telephone, telecopier or other electronically transmitted instructions, if
authorized herein, received from or believed by the Agent in good faith to have
been given by, an Authorized Representative.  This indemnity shall survive the
resignation of removal of the Agent and the satisfaction or termination of this
Agreement.

          Section 16.  Compensation of the Agent.  The Company agrees to pay the
                       -------------------------
compensation of the Agent at such rates as shall be agreed upon from time to
time and to reimburse the Agent for its out-of-pocket expenses (including costs
of preparation of the Notes and reasonable legal fees and expenses),
disbursements and advances incurred or made in accordance with any provisions of
this Agreement.  The obligations of the Company to the Agent pursuant to this
Section shall survive the resignation or removal of the Agent and the
satisfaction or termination of the Agreement.

          Section 17.  Notices.
                       -------

          (a)  All communications by or on behalf of the Company relating to the
issuance, transfer, exchange or payment of Notes or interest thereon shall be
directed to the Agent at its address set forth in subsection (b)(ii) hereof (or
such other address as the Agent shall specify in writing to the Company).

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<PAGE>

          (b)  Notices and other communications hereunder shall except to the
extent otherwise expressly provided, be in writing and shall be addressed as
follows, or to such other addresses as the parties hereto shall specify from
time to time:

               (i)  if to the Company:

                    Sierra Pacific Resources
                    6100 Neil Road
                    Reno, Nevada 89520-0024

                    Attention:  Director of Finance/Assistant Treasurer

               (ii) if to the Agent in connection with the issuance, transfer,
                    exchange or payment of Notes or interest thereon:

                    Bankers Trust Company
                    Corporate Trust and Agency Services
                    Four Albany Street
                    New York, New York 10006-1515

          Section 18.  Resignation or Removal of Agent.  The Agent may at any
                       -------------------------------
time resign as such agent by giving written notice to the Company of such
intention on its part, specifying the date on which its desired resignation
shall become effective; provided, however, that such date shall be not less than
                        --------  -------
three months after the giving of such notice by the Agent to the Company.  The
Agent may be removed at any time by the filing with it of any instrument in
writing signed by a duly authorized officer of the Company and specifying such
removal and the date upon which it is intended to become effective.  Such
resignation or removal shall take effect on the date of the appointment by the
Company of a successor agent and the acceptance of such appointment by such
successor Agent.  In the event of resignation by the Agent, if a successor Agent
has not been appointed by the Company within three months after the giving of
notice by the Agent of its intention to resign, the Agent may, at the expense of
the Company, petition any court of competent jurisdiction for appointment of a
successor Agent.

          Section 19.  Benefit of Agreement.  This Agreement is solely for the
                       --------------------
benefit of the parties hereto, their successors and assigns, and no other person
shall acquire or have any right under or by virtue hereof.

          Section 20.  Notes Held by the Agent.  The Agent, in its individual or
                       -----------------------
other capacity, may become the owner or pledgee of the Notes with the same
rights it would have if it were not acting as fiscal and paying agent hereunder.

                                       6
<PAGE>

          Section 21.  Governing Law.  This Agreement is to be delivered and
                       -------------
performed in, and shall be construed and enforced in accordance with, and the
rights of the parties shall be governed by, the laws of the State of New York.

          Section 22.  Counterparts.  This Agreement may be executed by the
                       ------------
parties hereto in any number of counterparts, and by each of the parties hereto
in separate counterparts, each such counterpart, when so executed and delivered,
shall be deemed to be an original, but all such counterparts shall together
constitute but one and the same instrument.

                                       7
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed on their behalf by their officers thereunto duly authorized, all as
of the date and year first above written.

                                             SIERRA PACIFIC RESOURCES

                                             By:_____________________________

                                             BANKERS TRUST COMPANY

                                             By:_____________________________

                                       8

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