Document:

<PAGE>

                                 EXHIBIT 4(b)
          THRIFT PLAN FOR EMPLOYEES OF SENTINEL TRANSPORTATION COMPANY

                             RULES AND REGULATIONS
                             ---------------------

                           Effective January 1, 1996
<PAGE>

                              SUMMARY OF CONTENTS
                              -------------------

<TABLE>
<CAPTION>
Chapter 1                                                               PAGE
                                                                        ----
<S>          <C>                                                         <C>
 I.      PURPOSE                                                         I-1

 II.     DEFINITIONS                                                    II-1

 III.    ELIGIBILITY AND PARTICIPATION                                 III-1
         A. Eligibility Requirements
         B. Commencement of Participation
         C. Participation Non-Mandatory
         D. Providing Plan Rules
         E. Transfers to Sentinel
         F. Termination of Participation

 IV.     EMPLOYEE PARTICIPATION                                         IV-1
         A. Participation by Payroll Deduction
         B. Change in Participation
         C. Change in Participation for Highly
            Compensated Participants
         D. Participation by Direct Remittance

         E. Temporary Employee--Insufficient Earnings
         F. Transfer of Fund to Trustee
         G. Internal Revenue Code Limitations

 V.      COMPANY CONTRIBUTIONS                                           V-1
         A. Amount of Company Contributions
         B. Additional Company Contributions
         C. Transfer of Funds to Trustee

 VI.     LIMITATION ON ANNUAL ADDITIONS                                 VI-1

 VII.    INVESTMENT PROVISIONS                                         VII-1
         A. Investment Direction
         B. Fund Transfer(s)
         C. Investment Options
         D. Uninvested Funds
         E. Trustee Action
         F. Trustee - Maintenance of Assets

 VIII.   CREDITS AND CHARGES TO EMPLOYEE ACCOUNTS                     VIII-1
         A. Allocation of Income and Costs on Investments

 IX.     SUSPENSION OF DEPOSITS                                         IX-1
         A. Involuntary Suspension of Deposits
         B. Voluntary Suspension of Deposits
         C. Company Contributions During Suspension
</TABLE>

                                       i
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                        SUMMARY OF CONTENTS (continued)
                        -------------------------------

<TABLE>
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Chapter 1                                                               PAGE
                                                                        ----
<S>                                                                     <C>
X.     WITHDRAWALS                                                       X-1
       A. Full Withdrawals - Retirement
       B. Full Withdrawals - Other Than Retirement
       C. Partial Withdrawals
       D. Early Distribution Tax Exemption
       E. Compliance with Minimum Distribution Rules
       F. Waiver of Notice
       G. Twenty Percent Withholding

XI.    LOANS                                                            XI-1
       A. Eligibility for a Loan
       B. Obtaining Funds for a Loan
       C. Maximum Amount of Loan
       D. Loan Repayment Period
       E. Rate of Interest
       F. Frequency of Loans
       G. Method of Loan Repayment
       H. Exceptions to Normal Method of Repayment
       I. Prepayment of Loan Balance
       J. Loan Defaults
       K. Loan Administrator--Authority/Responsibilities
       L. Suspension of Loans

XII.   BENEFICIARIES, TERMINATED EMPLOYEES AND ALTERNATE PAYEES        XII-1
       A. Beneficiary Designation
       B. Payment to Beneficiary(s)
       C. Payment to Terminated Employees
       D. Qualified Domestic Relations Order
       E. Sale of Business or Facility

XIII.  AFFILIATED COMPANIES                                           XIII-1
       A. Affiliated Company Participation
       B. Affiliated Company Authority

XIV.   ADMINISTRATION                                                  XIV-1
       A. Trustee
       B. Employee Benefit Plans Board
       C. Thrift Plan Regulations
       D. Recognition of Agency of a Member
       E. Thrift Plan Audit
       F. Reporting to Plan Members
       G. Administrative Liability
       H. Administrative Expense
       I. Claims by Members
</TABLE>

                                      ii
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                        SUMMARY OF CONTENTS (continued)
                        -------------------------------

<TABLE>
<CAPTION>
Chapter 1                                                               PAGE
                                                                        ----
<S>    <C>                                                              <C>
XV.    NOTICES AND OTHER COMMUNICATIONS                                  XV-1
       A. Plan Communication to Members
       B. Member Communications to the Plan
       C. Third-Party Communications to the Plan

XVI.   NONASSIGNABILITY                                                 XVI-1
       A. Assignments
       B. Trustee Payments to Lenders

XVII.  TERMS OF EMPLOYMENT UNAFFECTED                                  XVII-1

XVIII. CONSTRUCTION                                                   XVIII-1

XIX.   PLAN MODIFICATION AND TERMINATION                                XIX-1
       A. Method of Modification
       B. Members' Rights Upon Modification
       C. Merger, Transfer or Consolidation of Plan

XX.   EFFECTIVE DATE                                                     XX-1
       A. Board of Directors' Approval
       B. Trustee Certification
       C. Chapter 2 Members

XXI.   OPERATION OF THE PLAN AS A TOP-HEAVY PLAN                        XXI-1
       A. Minimum Vesting
       B. Minimum Contributions
       C. Effect on Limitation on Annual Additions
       D. Definitions

XXII.  QUALIFIED DOMESTIC RELATIONS ORDER                              XXII-1
       A. Status of QDRO
       B. Distribution of Before Tax Account Funds

XXIII. ROLLOVERS AND TRUST TO TRUST TRANSFERS                         XXIII-1
       A. Rollovers/Transfers to Plan
       B. Rollovers From Plan
</TABLE>

Chapter 2

                                      iii
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          THRIFT PLAN FOR EMPLOYEES OF SENTINEL TRANSPORTATION COMPANY
          ------------------------------------------------------------

     Sentinel Transportation Company ("Sentinel") became a wholly owned
subsidiary of E. I. du Pont de Nemours and Company in December 1995.  Prior to
its incorporation Sentinel was part of Conoco Inc.'s downstream operation
(transportation).  As part of Conoco Inc., eligible employee of such operation
participated in the Thrift Plan for Employees of Conoco, Inc.

     With the incorporation of Sentinel, Conoco employees dedicated to such
operations were transferred to and became Sentinel employees.  Sentinel's Board
of Director adopted, effective January 1, 1996, the Thrift Plan for Sentinel
Transportation Company, to provide the continued participation of such former
Conoco employees and the participation for new employees in a tax qualified
plan.

                                   CHAPTER 1
                                   ---------

This chapter shall be applicable to all employees who may participate in the
Plan except those subject to Chapter 2 hereof.  Chapter 2 shall be applicable to
all union represented employees covered by a negotiated contract between such
union and Sentinel  or any of its affiliates which contract provides for
participation in the Plan except those employees covered by contracts
specifically named in Chapter 2.

I.   PURPOSE
     -------

     The purpose of this Plan is to encourage employees to save systematically a
     portion of their current compensation and to assist them to accumulate
     additional means for the time of their retirement.

                                      I-1
<PAGE>

II.  DEFINITIONS
     -----------

     Unless the context otherwise requires, the following words as used herein
     shall have the following meanings:

     A.   "Affiliated Company" or "Affiliated Companies" shall mean any
          corporation(s) of which E. I. du Pont de Nemours and Company owns,
          directly or indirectly, at least 25 percent of the issued and
          outstanding stock entitled to vote for the election of directors.

     B.   "Annual Additions" shall mean the sum for any year of Corporate
          Employer contributions, including contributions to a Participant's
          Before-Tax Account, and the Participant's Employee Contributions;
          provided, however, that Annual Additions for any Plan Year before 1987
          shall not be recomputed to treat all Employee Contributions made by
          Participants as Annual Additions. Annual additions also shall include
          contributions described in Code section 415(l) and contributions for
          medical benefits within the meaning of Code section 419A(f)(2).

     C.   "Basic Deposits" shall mean all deposits made by a Participant to his
          Employee Account other than as provided in Article X.C.1.b., not in
          excess of the following percentages of the Participant's Compensation
          at the time of such deposit:

                                     II-1
<PAGE>

     D.   "Beneficiary Member" shall mean an entity (including, but not limited
          to, individuals, trusts, estates, partnerships, corporations,
          unincorporated organizations, and associations) that has been
          designated as a beneficiary pursuant to Article XII.A. and for which
          the Trustee holds an Employee Account.

     E.   "Benefit Board" shall mean the Employee Benefit Plans Board created
          and appointed as provided in Article XIV.B. hereof.

     F.   "Board" shall mean the Board of Directors of Sentinel Transportation
          Company.

     G.   "Code" shall mean the Internal Revenue Code of 1986, as amended.

     H.   "Company Contributions" shall mean all contributions to a
          Participant's Employee Account made by Sentinel pursuant to Article V.
          of the Plan. As used herein, this term shall not include deposits to a
          Participant's Before Tax Account.

     I.   "Compensation" shall mean the regular compensation paid to a
          Participant for services rendered to Sentinel, or which a Participant
          has elected to defer pursuant to a cash or deferred arrangement
          provided for under Section 401(k) of the Code excluding any bonuses,
          commissions, overtime, or special pay, under rules uniformly
          applicable to all Participants similarly situated. "Compensation"
          shall include amounts which a Participant contributed to a Dependent
          Care Spending Account or a Health Care Spending Account sponsored by
          Sentinel as authorized by Section 125 of the Code.

          The annual compensation of each Participant taken into account for
          determining all benefits provided under the Plan for any determination
          period shall not exceed $200,000, for Plan Years after December 31,
          1988, and shall not exceed $150,000 for Plan Years after December 31,
          1993, as such limit is adjusted by the Secretary as provided under
          section 415(d) of the Code. If the period for determining compensation
          used in calculating an allocation for a determination period is a
          short Plan Year (i.e. shorter than 12 months), the annual compensation
          limit is an amount equal to the otherwise applicable annual
          compensation limit multiplied by a fraction, the numerator of which is
          the number of months in the short Plan Year, and the denominator of
          which is 12.

          In determining the compensation of a Participant for purposes of this
          limitation, the family aggregation rules of section 414(q)(6) of the
          Code shall apply, except that in applying such rules, the term
          "family" shall include only the spouse of the Participant and any
          lineal descendants of the Participant who have not attained age 19
          before the close of the year. If, as a result of the application of
          such rules the adjusted limitation is exceeded, then the limitation
          shall be prorated among the affected individuals in proportion to each
          such individual's compensation as determined under this section prior
          to the application of this limitation.

     J.   "Corporate Employer" shall mean an employer as defined in Code Section
          414(b) and 414(c), as modified by Section 415(h) of the Code.

     K.   "Defined Benefit Plan" shall mean any plan qualified under the
          Internal Revenue Code which is not a Defined Contribution Plan.

     L.   The "Defined Benefit Plan Fraction" for any year shall mean a
          fraction, the numerator of which is an amount representing the total
          Projected Annual Benefit of the Participant under all Defined Benefit
          Plans of the Corporate Employer, determined as of the close

                                     II-2
<PAGE>

          of the year, and the denominator of which is the lesser of (i) the
          product of 1.25 multiplied by $90,000 (or such greater amount as may
          be allowable in accordance with regulations, rulings, or other
          official announcements issued by the Secretary of Treasury or his
          delegate), or (ii) the product of 1.4 multiplied by 100% of the
          Participant's average compensation for his high 3 years.

     M.   "Defined Compensation" shall have the following meaning. Compensation,
          for purposes of applying the limitations of section 415, includes the
          following: (a) wages, salaries, fees for professional services and
          other amounts received (whether or not in cash) for personal services
          actually rendered in the course of employment with an employer
          maintaining the plan to the extent includible in gross income
          (including fringe benefits, reimbursements, and expense allowances);
          (b) earned income (with respect to Employees within the meaning of
          section 401(c)(1)); (c) foreign earned income (as defined in section
          911(b)); (d) amounts described in sections 104(a)(3), 105(a) and
          105(h) but only to the extent they are includible in the Employee's
          gross income; (e) amounts paid or reimbursed by the employer for
          moving expenses incurred by the Employee to the extent that such
          amounts are not deductible under section 217; (f) the value of a
          nonqualified stock option granted to an Employee by the employer to
          the extent the value is includible in the Employee's gross income; and
          (g) the amount includible in the Employee's gross income upon making
          the election in section 83(b).

          Compensation for purposes of section 415 does not include the
          following: (a) contributions made by the employer to a deferred
          compensation plan which, without regard to section 415, are not
          includible in the Employee's gross income for the taxable year in
          which contributed; (b) employer contributions made on behalf of the
          Employee to a simplified employee pension plan to the extent they are
          deductible by the Employee; (c) distributions from a deferred
          compensation plan (except from an unfunded nonqualified plan when
          includible in gross income); (d) amounts realized from the exercise of
          a nonqualified stock option, or when restricted stock (or property)
          held by an Employee either becomes freely transferable or is no longer
          subject to a substantial risk of forfeiture; (e) amounts realized from
          the sale, exchange or other disposition of stock acquired under a
          qualified stock option; and (f) other amounts which receive special
          tax benefits, such as premium for group term life insurance (to the
          extent excludable from gross income) or employer contributions for the
          purchase of an annuity contract described in section 403(b) of the
          Code.

          In determining whether there have been excess aggregate contributions
          under Section 401(m) of the Code, "compensation" used in such
          determination shall be the same as "defined compensation" described
          above.

     N.   "Defined Contribution Plan" shall mean a plan qualified under the Code
          which provides for an individual account for each Participant and for
          benefits based solely on the amounts contributed to the Participant's
          Account, and any income, expenses, gains, and losses which may be
          allocated to such Participant's Employee Account.

     O.   The "Defined Contribution Plan Fraction" for any year shall mean a
          fraction, the numerator of which is the sum of the Annual Additions to
          the Participant's Employee Account in all Defined Contribution Plans
          of the Corporate Employer as of the close of the year, and the
          denominator of which is the sum of the lesser of the following amounts
          determined for such year and for each prior year of service with the
          Corporate Employer: (i) the product of 1.25 multiplied by the dollar
          limitation under Section 415(c)(1)(A) of the Code for

                                     II-3
<PAGE>

          such year (determined without regard to Section 415(c)(6) of the
          Code), or (ii) the product of 1.4 multiplied by 25% of the Employee's
          Defined Compensation for such year. In applying this definition with
          respect to years beginning before January 1, 1976:

          1.   The aggregate amount taken into account in determining the
               numerator of the Defined Contribution Plan Fraction may not
               exceed the aggregate amount taken into account in determining the
               denominator of the Defined Contribution Plan Fraction, and

          2.   The amount taken into account in determining the amount of a
               Participant's Employee Contributions in excess of 6 percent of
               his Defined Compensation for any year concerned shall be an
               amount equal to:

               a.   the excess of the aggregate amount of Employee Contributions
                    for all years beginning before January 1, 1976, during which
                    the Employee was an active Participant in the Defined
                    Contribution Plan(s) of the Corporate Employer, over 10
                    percent of the Participant's aggregate Defined Compensation
                    for all such years, multiplied by a fraction, the numerator
                    of which is 1 and the denominator of which is the number of
                    years beginning before January 1, 1976, during which the
                    Employee was an active Participant in the Defined
                    Contribution Plan.

                    For the purpose of 2 above, Employee Contributions made on
                    or after October 2, 1973, shall be taken into account only
                    to the extent that the amount of such contributions does not
                    exceed the maximum amount of Employee Contributions
                    permissible under the Defined Contribution Plan(s) as in
                    effect on October 2, 1973.

          An amount shall be subtracted from the numerator of the Defined
          Contribution Plan Fraction (not exceeding such numerator) as
          prescribed by the Secretary of the Treasury so that the sum of the
          Defined Benefit Plan Fraction and the Defined Contribution Plan
          Fraction computed under Code section 415(e)(1) does not exceed 1.0 for
          Plan Years after 1985.

     P.   "DuPont" shall mean E. I. du Pont de Nemours and Company, a Delaware
          corporation.

     Q.   "Employee" shall mean any person in the employ of Sentinel, other than
          a person who is receiving a pension, severance pay, retainer,
          commission or fee under contract or an individual who must be treated
          as an employee of Sentinel for limited purposes under the "leased
          employee" provisions of Section 414(n) of the Code.

          Any person shall cease to be an Employee, as defined herein, on
          termination of service, and shall not again become an Employee for
          purposes of this Plan prior to his reemployment date unless he is
          rehired prior to incurring a One-Year Break-in-Service.

          The term "Employee" shall include an individual who must be treated as
          an Employee under section 414(n) of the Code (a "Leased Employee"),
          but only to the extent required by that Code section and final
          regulations thereunder. A Leased Employee shall be treated as an
          Employee for purposes of determining Hours of Service for
          participation and nonforfeitability of benefits (in the event the
          individual becomes an Employee without regard to this paragraph). A
          Leased Employee shall be treated as an Employee for

                                     II-4
<PAGE>

          purposes of the other requirements set out in section 414(n)(3) of the
          Code.

     R.   "Employee(s) Account(s)" or "Employee's Account" shall mean all
          cash and other assets held by the Trustee under the Plan for the
          account of a Member.

          1.   "Regular Account" shall mean all cash and other assets held by
               the Trustee which resulted from contributions made to the Plan,
               or earnings thereon, other than those in a Member's Before-Tax
               Account.

          2.   "Before-Tax Account" shall mean all cash and other assets held by
               the Trustee which resulted from contributions made to the Plan
               designated for the Before-Tax Account, or earnings thereon,
               pursuant to a cash or deferred arrangement of Section 401(k) of
               the Code.

     S.   "Employee Contributions" shall mean all Basic Deposits made by a
          Participant to his Employee Account and all Supplemental Deposits made
          by a Participant or a Transferred Member to his Employee Account.
          Employee Contributions shall not include Basic Deposits made by a
          Participant to his Before Tax Account for purposes of Article II.B.

     T.   "Employment Date" shall mean the date on which an Employee is first
          employed by Sentinel and on which an Employee completes one hour of
          service.

     U.   "Fund Transfer" shall mean an instruction by a Member to the Trustee
          to sell, liquidate, or redeem any investment in an Investment Option
          Fund in such Member's Employee Account, and transfer the proceeds to
          another Investment Option Fund in his Employee Account pursuant to the
          terms of the Plan. A Fund Transfer may not be made from an Investment
          Option Fund in a Member's Regular Account to an Investment Option Fund
          in a Member's Before Tax Account, or vice versa.

     V.   "Hardship" shall mean a showing by a Participant (1) that he has an
          immediate and heavy financial need and (2) that the hardship
          distribution is necessary to satisfy the immediate and heavy financial
          need.

          A.   Immediate and Heavy Financial Need

               A Participant may establish the existence of an immediate and
               heavy financial need in one of two ways.

               1.   Facts and Circumstances Need Requirements

                    A Participant may demonstrate by facts and circumstances the
                    existence of an immediate and heavy financial need created
                    by an emergency or extraordinary circumstance.

               2.   Deemed Need Requirements

                    A Participant may show that his immediate and heavy
                    financial need results from one of the following deemed
                    hardship conditions:

                    a.   Medical expenses described in Section 213(d) of the
                         Code incurred by the Participant, the Participant's
                         spouse or any dependents of the Participant.

                                     II-5
<PAGE>

                    b.   Purchase (excluding mortgage payments) of a principal
                         residence for the Participant.

                    c.   Payment of tuition and related educational fees for the
                         next 12 months of post-secondary education for the
                         Participant, the Participant's spouse, children or
                         dependents; or

                    d.   The need to prevent the eviction of the Participant
                         from his principal residence or foreclosure on the
                         mortgage of the Participant's principal residence.

          B.   Necessity of Hardship Distribution

               A Participant may establish that the hardship distribution is
               necessary to satisfy his immediate and heavy financial need in
               one of two ways. Under no circumstances will a distribution be
               considered necessary to satisfy an immediate and heavy financial
               need if it is in excess of that need.

               1.   Facts and Circumstances Distribution Requirements

                    A Participant may demonstrate by all relevant facts and
                    circumstances that the distribution is necessary to satisfy
                    the hardship need. Under this facts and circumstances
                    option, a Participant must establish in a sworn and
                    notarized statement that the immediate and heavy financial
                    need cannot be relieved:

                    a.   Through reimbursement or compensation by insurance or
                         otherwise;

                    b.   By reasonable liquidation of the Participant's assets
                         to the extent such liquidation would not itself cause
                         an immediate and heavy financial need;

                    c.   By cessation of Employee elective deferrals and
                         Employee savings under the Thrift Plan; or

                    d.   By other distributions or loans from any plans
                         maintained within the DuPont controlled group of
                         companies or from plans maintained by any other
                         employer or by borrowing from commercial sources on
                         reasonable commercial terms.

                    For purposes of the preceding paragraph, assets of the
                    Participant include assets of the Participant's spouse and
                    minor children reasonably available to the Participant.
                    Property held for a Participant's child under any
                    irrevocable trust or under the Uniform Gifts to Minors Act
                    shall not, however, be treated as an available resource of
                    the Participant.

               2.   Deemed Distribution Requirements

                    A Participant's request for a distribution to meet an
                    immediate and heavy financial need may be deemed necessary
                    to satisfy the need. Under this option, a Participant must
                    establish in a sworn and notarized statement that:

                                     II-6
<PAGE>

                    a.   The distribution is not in excess of the amount of the
                         Participant's immediate and heavy financial need; and

                    b.   The Participant has obtained all distributions, other
                         than hardship distributions, and all loans currently
                         available under all plans maintained by the DuPont
                         controlled group of companies.

                    If a Participant elects to have the establishment of
                    "necessary to satisfy the immediate and heavy financial
                    need" handled under the deemed standard set forth in
                    paragraph B.2. above, the following consequences shall, in
                    all cases, apply:

                    (1)  the Participant will be prohibited from making any
                         Employee elective deferrals and Employee Contributions
                         under the Thrift Plan and all other plans, with the
                         exception of health and welfare benefit plans,
                         maintained by the DuPont controlled group of companies
                         for a period of twelve (12) months after receipt of the
                         hardship distribution; and

                    (2)  the Participant will be prohibited from making elective
                         deferrals under the Thrift Plan and all other plans
                         maintained by the DuPont controlled group of companies
                         for the Participant's taxable year immediately
                         following the year of the hardship distribution in
                         excess of the applicable limit under Section 402(g) of
                         the Code for such next taxable year less the amount of
                         such Participant's elective deferrals for the taxable
                         year of the hardship distribution.

          C.   Withdrawable Amount

               The amount which may be withdrawn cannot exceed the total of the
               Participant's contributions to his Before Tax Account (and income
               allocable thereto credited to a Participant's Before-Tax Account
               as of December 31, 1988) nor the amount necessary to satisfy the
               immediate and heavy financial need created by the hardship. At
               the request of the Participant, the amount of an immediate and
               heavy financial need may include any amounts necessary to pay any
               federal income taxes or penalties reasonably anticipated to
               result from the distribution.

     W.   "Highly Compensated" refers to highly compensated active Employees and
          highly compensated former Employees, as defined herein.

          1.   A highly compensated active Employee includes any Employee who
               performs service for the Corporate Employer during the
               determination year and who, during the look-back year:  (i)
               received compensation from the Corporate Employer in excess of
               $75,000 (as adjusted pursuant to section 415(d) of the Internal
               Revenue Code); (ii) received compensation from the Corporate
               Employer in excess of $50,000 (as adjusted pursuant to section
               415(d) of the Internal Revenue Code) and was a member of the top-
               paid group for such year; or (iii) was an officer of the
               Corporate Employer and received compensation during such year
               that is greater than 50 percent of the dollar limitation in
               effect under section 415(b)(1)(A) of the Internal Revenue Code.
               Notwithstanding the above, in any year in which Sentinel
               maintains significant business

                                     II-7
<PAGE>

               activities in at least two significantly separate geographic
               areas, $50,000 may be substituted for $75,000 in (i) above, and
               (ii) may be disregarded.

          2.   The term highly compensated active Employee also includes:  (i)
               Employees who are both described in the preceding sentence if the
               term "determination year" is substituted for the term "look-back
               year" and the Employee is one of the 100 Employees who received
               the most compensation from the Corporate Employer during the
               determination year; and (ii) Employees who are 5 percent owners
               at any time during the look-back year or determination year.

          3.   For the purpose of determining who is a Highly Compensated
               Employee, the determination year shall be the Plan Year.  The
               look-back year shall be the 12-month period immediately preceding
               the determination year.

          4.   If an Employee is, during a determination year or look-back year,
               a family member of either a 5 percent owner who is an active or
               former Employee or a Highly Compensated Employee who is one of
               the ten most Highly Compensated Employees ranked on the basis of
               compensation paid by the Corporate Employer during such year,
               then the family member and the 5 percent owner or top-ten Highly
               Compensated Employee shall be aggregated.  In such case, the
               family member and 5 percent owner or top-ten Highly Compensated
               Employee shall be treated as a single Employee receiving
               compensation and plan contributions or benefits equal to the sum
               of such compensation and contributions or benefits of the family
               member and 5 percent owner or top-ten Highly Compensated
               Employee.  For purposes of this section, family member includes
               the spouse, lineal ascendants and descendants of the Employee or
               former Employee and the spouses of such lineal ascendants and
               descendants.

          5.   The determination of who is a Highly Compensated Employee,
               including the determinations of the number and identity of
               Employees in the top-paid group, the top 100 Employees, the
               number of Employees treated as officers and the compensation that
               is considered, will be made in accordance with section 414(q) of
               the Internal Revenue Code and the regulations thereunder.

          6.   A highly compensated former Employee includes any Employee who
               separated from service (or was deemed to have separated) prior to
               the determination year, performs no service for the Corporate
               Employer during the determination year, and was a 5 percent owner
               of the Corporate Employer at any time during the year or received
               compensation in excess of $50,000 during the year for either the
               separation year or any determination year ending on or after the
               Employee's 55th birthday.

     X.   "Hour(s) of Service" shall mean each hour for which an Employee is
          compensated or entitled to compensation for the performance of duties
          and includes each such hour for which back pay, irrespective of
          mitigation of damages, has been awarded or agreed to by Sentinel. An
          hour of service also includes each hour for which an Employee is
          compensated or entitled to compensation on account of a period of time
          during which no duties are performed (irrespective of whether the
          employment relationship has terminated) due to vacation, holiday,
          illness, incapacity (including disability), jury duty, military duty
          or Sentinel approved leave of absence as well as hours of time
          required to be taken into account by reason of Sections 414(b) and
          414(c) of the Code. Hours shall be credited to

                                     II-8
<PAGE>

          the computation period during which the duties are performed or to
          which the payment relates and, in the case of a period where no duties
          are performed, shall be credited on the basis of the number of
          regularly scheduled working hours during the period. All hours shall
          be calculated and credited in conformance with Sections 2530.200B-2(b)
          and (c) of Department of Labor regulations which are incorporated
          herein by reference. For purposes of crediting Hours of Service for
          vesting and for eligibility to participate in the Plan, the term
          "Employee" shall have the meaning stated in Article II.R. except that
          the term "Sentinel" shall mean Sentinel Transportation Company, a
          Delaware corporation, and/or any Affiliated Company regardless of
          whether said company participates in the Plan, and the term "Employee"
          shall include persons who would come within the definition of
          "Employee" but for the fact that they are in a class of employees
          excluded from participation in the plan.

     Y.   "Incapacity" shall mean the condition of a Participant's health
          whereby he is unable to perform his job function as an Employee, as
          determined by the Benefit Board.

     Z.   "Sentinel" shall mean the Sentinel Transportation Company, a Delaware
          corporation and/or any Affiliated Company participating in the Plan as
          hereinafter provided in Article XIII.

     AA.  "Investment Direction" shall mean an instruction by a Participant to
          the Trustee to invest future deposits, contributions and income
          pursuant to the terms of the Plan.

     BB.  "Investment Manager" shall mean an investment advisor registered under
          the Investment Advisors Act of 1940, a bank (other than the Trustee)
          as defined in that Act, or an insurance company qualified to perform
          investment management services which shall be designated or appointed
          as provided in Article XIV.A.4.

     CC.  "Limitation on Annual Additions" shall mean the limitation on
          contributions to a Participant's Employee Account as provided in
          Article VI.

     DD.  The masculine pronoun shall mean the feminine whenever appropriate.

     EE.  "Member" shall mean any person for whom the Trustee holds an Employee
          Account, including a Participant with a zero Employee Account balance
          due to a withdrawal pursuant to Article X.C. who has elected to resume
          making Basic Deposits immediately upon the completion of the
          suspension imposed by Article X.C.1.b.

     FF.  "Non-spouse Beneficiary Member" shall mean any person who is
          designated a beneficiary in accordance with Article XII. who is not a
          Spouse Beneficiary Member as defined in Article II. QQ. and for whom
          the Trustee holds an Employee Account.

     GG.  "One-Year Break-in-Service" shall mean any 12 consecutive month period
          commencing upon an:

          1.   Employment Date, or anniversary thereof, or

          2.   Reemployment Date, or anniversary thereof, during which an
               Employee does not complete 500 Hours of Service.

          Notwithstanding anything in this Plan to the contrary, for absences
          beginning after December 31, 1984, and upon presentation of proof
          satisfactory to the Benefit Board, an Employee who is absent from work
          for reasons of the individual's pregnancy, birth or adoption of a
          child, or for purposes of caring for the child immediately

                                     II-9
<PAGE>

          following its birth or adoption, will be deemed to have completed up
          to a maximum of 501 hours of service during the period of 12
          consecutive months commencing on the individual's most recent
          Employment Date, Reemployment Date, or anniversary thereof (whichever
          is applicable), commencing on the first date of such absence, unless
          such Employee has already earned more than 500 hours of service during
          such period of employment, then such Employee shall receive credit for
          up to a maximum of 501 Hours of Service in the subsequent 12-
          consecutive-month period for the purpose of preventing a One-Year
          Break-in-Service.

     HH.  "Participant" shall mean an Employee who is eligible for and has
          commenced participation in this Plan in accordance with Article III.
          of this Plan.

     II.  "Plan" shall mean this Thrift Plan for Employees of Sentinel
          Transportation Company.

     JJ.  "Plan Year" shall mean a twelve month period commencing on January 1
          and ending on December 31.

     KK.  "Projected Annual Benefit" shall mean the benefits which are projected
          to be paid annually under all Defined Benefit Plans of the Corporate
          Employer to an Employee payable as a straight life annuity commencing
          at Normal Retirement Date. Such projection shall be based on the
          assumptions that:

          1.   the Employee's compensation for all future years will equal his
               Compensation for the year of computation,

          2.   the Employee's future participation in the Defined Benefit Plans
               of the Corporate Employer will continue uninterrupted until he
               has reached his Normal Retirement Date and that he will earn a
               full year of Creditable Service for each full year he
               participates in the Defined Benefit Plans of the Corporate
               Employer during that period, and

          3.   all other relevant factors considered in computing the benefits,
               such as provisions of the Defined Benefit Plans of the Corporate
               Employer and social security benefit levels, will remain constant
               with the year of computation.

     LL.  "QDRO Member" shall mean an individual for whom the Trustee holds an
          Employee Account pursuant to a Qualified Domestic Relations Order.

     MM.  "Reemployment Date" shall mean the date following five One-Year Breaks
          in Service on which a previously employed person is reemployed and
          completes an Hour of Service.

     NN.  "Retired Member" shall mean a former Participant who has taken normal,
          early or incapacity retirement under the Retirement Plan and for whom
          the Trustee holds an Employee Account.

     OO.  "Retirement Plan" shall mean The Retirement Plan of Sentinel
          Transportation Company, which became effective January 1, 1996, as
          from time to time amended, or the Employees' Retirement Plan of
          Conoco, which became effective July 1, 1947, as from time to time
          amended.

     PP.  "Rollover Member" shall mean an Employee, who is not a Participant
          from whom the Trustee has accepted a rollover or trust-to-trust
          transfer of assets from a qualified plan or an individual retirement
          account in accordance with the provisions of Article XXIII. of this
          Plan.
                                     II-10
<PAGE>

     QQ.  "Spouse Beneficiary Member" shall mean the spouse of a Participant or
          Retired Member at the time of such Participant's or Retired Member's
          death, who, in accordance with Article XII.A., is the designated
          beneficiary of such Participant or a Retired Member and for whom the
          Trustee holds an Employee Account.

     RR.  "Supplemental Deposits" shall mean all deposits to a Member's Employee
          Account in excess of Basic Deposits and Company Contributions.
          Supplemental Deposits may not exceed the sum of:

          1.   16 percent of his compensation earned after December 31, 1975,
               for all years since he became a Participant in the Plan; less

          2.   the amount of Basic Deposits during such period which have not
               been withdrawn from his Employee Account.

          Only a Participant or a Transferred Member may make Supplemental
          Deposits.

     SS.  "Terminated Member" shall mean a former Participant, who has
          terminated his employment with Sentinel at a time when he was not
          eligible for normal, early or incapacity retirement under the
          Retirement Plan, for whom the Trustee holds an Employee Account.

     TT.  "Transferred Member" shall mean a former Participant, who has been
          transferred from Sentinel, at the request or with the consent of
          Sentinel, to a nonparticipating Affiliated Company and who has left
          his Employee Account in the Plan.

     UU.  "Trustee" shall mean the Trustee under the Plan hereinafter named in
          Article XIV.A. or any successor to said Trustee.

     VV.  "Vesting (vested)" shall mean the nonforfeitable right of a
          Participant in the Plan to his total Regular Account, which shall be
          acquired only on the earlier of:

          1.   Five years of participation since the most recent date of
               enrollment in the plan, a year of participation being defined as:

               Twelve consecutive months during which a non-vested Participant
               maintains a positive account balance or makes at least one
               monthly contribution, except that the fifth year of participation
               under this Article II.VV.1.b. shall be deemed a year of
               participation upon the first day of the fifth month of the 12
               month period; or

          2.   A total of ten cumulative years of service or, on or after
               October 1, 1988, a total of five cumulative years of service,
               including for any Participant whose Employment Date is January 1,
               1993, or later, a total of five cumulative years of service that
               includes four years of participation in the Plan,  any such year
               commencing upon an:

               a.   Employment Date, and anniversary date thereof; or

               b.   Reemployment Date, and anniversary date thereof,

               during which an Employee completes 1,000 or more hours of
               service, provided that any period before termination of
               employment if there was also a complete withdrawal from the Plan
               which occurred prior to January 1, 1976, shall not count for
               vesting purposes, and further provided that service

                                     II-11
<PAGE>

               subsequent to five consecutive One-Year Breaks-in-Service shall
               not count toward vesting a Participant's Employee Account which
               accumulated prior to such five One-Year Breaks-in-Service, or

          3.   Attaining the age of 65, which is the Normal Retirement Age under
               this Plan.

               A Member shall be vested in his Before-Tax Account and in that
               portion of his Regular Account derived from his Employee
               Contributions at all times. The portion of a Member's Regular
               Account derived from his Employee contributions is his Basic
               Deposits and Supplemental Deposits and all income, expenses,
               gains and losses attributable thereto.

          If a Member is Vested when he ceases to be an Employee, he shall be
          Vested upon becoming an Employee again thereafter. If a Member is not
          Vested when he ceases to be an Employee, and he becomes an Employee
          again thereafter, his prebreak service shall be disregarded in
          determining the Vesting of his post-break accrued benefit only if the
          number of consecutive One-Year Breaks in Service equals or exceeds the
          greater of five or the aggregate number of the Member's years of
          service prior to the break in service.

     WW.  "Year" shall mean the twelve month period commencing January 1 and
          ending the following December 31.

                                     II-12
<PAGE>

III.  ELIGIBILITY AND PARTICIPATION
      -----------------------------

      A.  Eligibility Requirements

          1.   Each and every Employee participating in the Thrift Plan for
               Employees of Conoco Inc. on December 31, 1995 shall continue to
               participate under the terms of the Plan as adopted except as
               hereinafter otherwise provided, eligibility for participation in
               the Plan shall be open to:

          2.   any full time, regular Employee whose Employment Date or
               Reemployment Date is earlier than January 1, 1993, who became a
               member of the Retirement Plan before January 1, 1993 and
               continues to maintain membership therein;

          3.   any regular, full time Employee who has completed at least one
               year of continuous service or who was eligible to participate in
               a qualified profit-sharing plan of an Affiliated Company from
               which he was transferred;

          4.   any Employee who has completed a period of 12 consecutive months
               commencing on the Employee's Employment or Re-Employment Date,
               whichever is applicable, or a succeeding anniversary of such
               date, during which he completes 1,000 or more Hours of Service;
               and,

          5.   any Employee, including a Member who is rehired and again becomes
               an Employee, who previously met the requirements of either
               paragraph 1., 2. or 3. of this Article III.A.

          For the purpose of Article III.A.2. only, "continuous service" is the
          period of time that has elapsed since the Employee's original
          Employment Date or Reemployment Date since his last termination of
          employment with Sentinel.

          For purposes of this Article III.A. only, on and after January 1,
          1993, a Participant will be treated as having completed 190 hours of
          service for each month in which he completes at least one hour of
          service.

     B.  Commencement of Participation

          1.   An Employee may commence his participation on the first day of
               the calendar month in which he becomes eligible, provided he
               files with the Benefit Board or its delegee a notice of his
               election to become a Participant of the Plan, such notice to be
               in the manner prescribed by the Benefit Board, or in the event an
               eligible Employee does not elect to participate when first
               eligible, he may thereafter commence participation as of the
               first day of the calendar month following the date he files with
               the Benefit Board or its delegee a notice of his election to
               become a Participant in the Plan, provided, however, that no
               Employee who is on a Sentinel approved leave of absence or is
               otherwise absent from work on the date he becomes eligible may
               become a Participant in the Plan until the day of his return from
               such absence.  Commencement of participation in the Plan by an
               eligible Employee shall be accomplished by his election to make
               deposits as hereinafter provided.

          2.   Notwithstanding the effective date of participation set forth in
               Article III.B.1. above, an Employee who is transferred to
               Sentinel on and after January 1, 1996, from an Affiliated Company
               or from a corporation that has adopted a profit

                                     III-1
<PAGE>

               sharing plan administered by an Affiliated Company and who was a
               participant in the profit sharing plan thereof, may become a
               Participant in the Plan on the date he is employed by Sentinel
               provided he has filed with the Benefit Board or its delegee a
               notice of his election to become a Participant in the Plan. In
               the event an eligible Employee has not filed the required notice
               with the Benefit Board or elects not to participate when first
               eligible, he may thereafter commence participation as of the
               first day of the calendar month following the date he files with
               the Benefit Board or its delegee a notice of his election to
               become a Participant in the Plan.

     C.   Participation in the Plan by an Employee shall be voluntary.

     D.   Each Employee at the time of becoming a Participant in the Plan or
          within a reasonable period thereafter shall be given a copy of the
          Summary Plan Description, describing the Plan, as effective at that
          time.

     E.   Transfers to Sentinel

          1.   An employee of a nonparticipating Affiliated Company or of a
               corporation that has adopted a profit sharing plan administered
               by a nonparticipating Affiliated Company, who is transferred at
               the request of such Affiliated Company or corporation and Conoco
               to the employ of Sentinel, may participate in this Plan provided
               such Employee has satisfied the requirement of Article III. A.2.,
               3., or 4.  The years of participation by an Employee in the
               profit sharing plan of such nonparticipating Affiliated Company
               or corporation, if any, shall be included in determining an
               Employee's years of participation in this Plan.  The years of
               service of an employee in a nonparticipating Affiliated Company
               or corporation profit sharing plan which would have been counted
               as years of service under this Plan had the Employee been a
               member of this Plan, shall be included in determining the
               Employee's years of service under this Plan.

          2.   Any Employee, who becomes a Participant in the Plan and who is or
               has been transferred to Sentinel from an Affiliated Company or a
               corporation which has adopted a profit sharing plan administered
               by an Affiliated Company and has an Employee Account in the
               profit-sharing plan of said Affiliated Company or corporation,
               may request the Trustee, in the manner prescribed by the Benefit
               Board, to accept the transfer of his entire Employee Account, if
               any, from such other plan into his Employee Account in this Plan.
               Any transfer of an Employee Account to this Plan must be
               requested prior to the Participant's subsequent transfer of
               employment from Sentinel.  The Benefit Board shall determine
               whether the transfer of an Employee Account to this Plan shall be
               in cash or in kind on the basis of uniform rules applicable to
               all Participants on the same basis.  The amount in Employee
               Accounts so transferred, shall be categorized as being in a
               Regular or  Before Tax Account as defined in this Plan and the
               amounts within such Employee Accounts shall be categorized as
               Basic Deposits, Supplemental Deposits, Company Contributions, and
               Earnings.  Basic Deposits transferred to an Employee Account from
               other plans shall not be entitled to matching Company
               Contributions.

          3.   For the purpose of a suspension due to a withdrawal under this
               Plan, a withdrawal by a Participant of any part of an Employee
               Account from a profit sharing plan of an Affiliated

                                     III-2
<PAGE>

               Company or from the plan of a corporation that has adopted a
               profit sharing plan administered by an Affiliated Company shall
               have the same effect as if the Participant had made a withdrawal
               from this Plan.

     F.   Termination of Participation

          1.   A Participant shall cease being a Participant in this Plan at any
               time that he ceases being an Employee or takes a full withdrawal
               pursuant to Article X.B. or X.C. and elects not to resume Basic
               Contributions immediately upon the end of the suspension imposed
               under Article X.C.1.b.

                                     III-3
<PAGE>

IV.  EMPLOYEE PARTICIPATION
     -----------------------

     A.   Participation by Payroll Deduction

          To participate in the Plan, an Employee shall designate as a payroll
          deduction a percent of his monthly Compensation, in 1 percent
          increments, to be deposited in his Employee Account. The first 6
          percent of the amount so designated will be deemed to be Basic
          Deposits, unless such Participant has a suspension of Basic Deposits.
          The Participant may elect to have up to 15 percent of his monthly
          Compensation, but not more than $7,000 per year deferred pursuant to a
          cash or deferred arrangement under Section 401(k) of the Code (the
          $7,000 shall be adjusted to reflect increases in the cost of living in
          accordance with Section 415(d) of the Code). The amount so designated
          will be deposited by Sentinel to the Participant's Before Tax Account.
          Deposits in excess of that designated to the Before Tax Account shall
          be deposited to a Participant's Regular Account. The total amount
          which may be designated for deposit to a Participant's Employee
          Account shall be in accordance with Article II.RR.

     B.   Change in Participation

          The payroll deduction deposit percentage designated by the Participant
          shall continue in effect, notwithstanding any change in his
          compensation, until he shall change that percentage. A Participant may
          change such percentage at any time to be effective the first of the
          next succeeding calendar month. Such changes shall be by direction to
          the record keeper designated by Sentinel in the form prescribed by the
          Benefit Board.

     C.   Change in Participation for Highly Compensated Participants

          1.   The Benefit Board shall determine at the beginning of each month
               whether the Before Tax and Regular Account contributions elected
               by Highly Compensated Participants ("elected percentage") will,
               based on projections to the end of the Plan Year, cause the plan
               not to comply with the limitations on contributions imposed by
               sections 401(k) and 401(m) of the Code. Such projections will be
               made by assuming constant future compensation and constant future
               elected contribution percentages. If the projections indicate
               that adjustments are necessary to avoid exceeding the
               limitations, the Benefit Board shall take the following actions.

               a.   The Benefit Board will determine the maximum percentages of
                    Before Tax and Regular Account contributions respectively
                    that can be made by Highly Compensated Participants for the
                    following month without causing the Plan, on a projected
                    basis, to exceed such limitations ("Allowable Percentages").
                    Reductions in the Allowable Percentages, if any, determined
                    for this purpose will be made in one percent increments and
                    will be applied uniformly to all Highly Compensated
                    Participants.

               b.   The Benefit Board will reduce the percentages of Before Tax
                    and Regular Account contributions of each Highly Compensated
                    Participant to the Allowable Percentages in accordance with
                    the following rules:

                                     IV-1
<PAGE>

                    (1)  If the elected percentage designated by the Highly
                         Compensated Participant for the Before Tax Account
                         exceeds the Allowable Percentage for Before Tax
                         contributions, and if the Participant so elects, the
                         Benefit Board will change the elected percentage in
                         excess of that allowable to a Regular Account
                         contribution or, if the Participant does not so elect,
                         pay the excess to him.

                    (2)  If the elected percentage designated by the Highly
                         Compensated Participant for the Regular Account exceeds
                         the Allowable Percentage for Regular Account
                         contributions and if the Participant has so elected,
                         the Benefit Board will change the elected percentage in
                         excess of that allowable to a Before Tax Account
                         contribution,  or if the Participant does not so elect,
                         pay the excess to him.

                    (3)  To the extent a Before Tax contribution election cannot
                         be changed to a Regular Account contribution or vice
                         versa without causing a projected violation of the
                         limitations on contributions imposed by sections 401(k)
                         and 401(m) of the Code, the excess shall be paid to the
                         Participant.

               2.   If it is determined after the close of a Plan Year that
                    participation by Highly Compensated Participants has
                    exceeded the discrimination standards of Code sections
                    401(k) ("Excess Contributions") or 401(m) ("Excess Aggregate
                    Contributions"), the amount of the Excess Contributions or
                    the Excess Aggregate Contributions shall be refunded to the
                    Highly Compensated Participants in accordance with the
                    following rules.

                    a.   Determination of the amount of Excess Contributions for
                         a Highly Compensated Participant shall be made in the
                         following manner.  First the actual deferral ratio
                         ("ADR") of the Highly Compensated Participant with the
                         highest ADR will be reduced to the extent necessary to
                         satisfy the actual deferral percentage ("ADP") test or
                         cause such ratio to equal the ADR of the Highly
                         Compensated Participant with the next highest ratio.
                         Second, this process shall be repeated until the ADP
                         test is satisfied.  The amount of Excess Contributions
                         for a Highly Compensated Participant will be equal to
                         the total of elective contributions taken into account
                         for the ADP test minus the product of the employee's
                         reduced ADR as determined above and the employee's
                         compensation.

                    b.   Determination of the amount of Excess Aggregate
                         Contributions for a Highly Compensated Participant
                         shall be determined in the same manner as described in
                         paragraph a. above ("Leveling") but substituting
                         "actual contribution ratio" for "actual deferral ratio"
                         and substituting "actual contribution percentage

                                     IV-2
<PAGE>

                         (ACP) test" for "actual deferral percentage (ADP) test"
                         and "ACP" for "ADP".

                    c.   If a Highly Compensated Participant's ADR or actual
                         contribution ratio was determined under the family
                         aggregation rules, the Highly Compensated Participant's
                         ADR or actual contribution ratio is to be determined
                         using the same Leveling method described in paragraphs
                         a. and b.  The resulting Excess Aggregate Contributions
                         are allocated among the family members in proportion to
                         the employee and matching contributions of each family
                         member that is combined to determine the actual
                         contribution ratio, and the resulting Excess
                         Contributions are allocated among the family members in
                         proportion to the contributions of each family member
                         that have been combined.

                    d.   The amount of Excess Contributions to be distributed
                         shall be reduced by deferrals in excess of Code section
                         402(g) limits ("Excess Deferrals") previously
                         distributed for the taxable year ending in the same
                         Plan Year, and Excess Deferrals to be distributed for a
                         taxable year will be reduced by Excess Contributions
                         previously distributed for the plan beginning in such
                         taxable year.

                    e.   Distribution (or forfeiture, if applicable) of Excess
                         Aggregate Contributions or of Excess Contributions will
                         include the income allocable thereto.  The income
                         allocable to the Excess Aggregate Contributions or
                         Excess Contributions includes income for the Plan Year
                         for which the Excess Aggregate Contributions or Excess
                         Contributions were made but does not include income for
                         the period between the end of the Plan Year and the
                         date of distribution (or forfeiture).

                    f.   If a distribution of Excess Aggregate Contributions or
                         Excess Contributions results in a distribution of Basic
                         Deposits, the matching Company Contributions which
                         relate to such Basic Deposits must be distributed or
                         forfeited, as applicable.

                    g.   A distribution of Excess Aggregate Contributions or
                         Excess Contributions shall be made within 2 1/2 months
                         of the end of the Plan Year in which they were made.

               3.   In lieu of a distribution of Excess Contributions as
                    described above in paragraph 2, a Highly Compensated
                    Participant may elect to have such Excess Contributions
                    recharacterized as Employee Contributions in accordance with
                    the following rules.

                    a.   The amount of Excess Aggregate Contributions for such
                         Participant shall be determined only after first
                         determining the Excess Contributions that

                                     IV-3
<PAGE>

                         are treated as employee contributions due to
                         recharacterization.

                    b.   Recharacterized Excess Contributions remain subject to
                         the nonforfeitability requirements and to the
                         restrictions on distributions that apply to Before Tax
                         contributions.

                    c.   The amount to be recharacterized is offset by any
                         amounts previously distributed as Excess Deferrals.

                    d.   Recharacterization shall take place within 2 1/2 months
                         of the end of the Plan Year to which the
                         recharacterization relates.  Recharacterization will be
                         deemed to occur on the date on which the last affected
                         Highly Compensated Participant is notified of the
                         recharacterization and the tax consequences of such
                         recharacterization.

               4.   If one or more Highly Compensated Employees is a Participant
                    in both the portion of this Plan subject to the ACP test and
                    that which is subject to the ADP test, then the tests shall
                    be applied in such a way as to avoid multiple use of the
                    alternative limitation, in accordance with Treasury
                    regulations 1.401(m)-2 and section 401(m)(9) of the Code.

                    If there is an impermissible multiple use of the alternative
                    limitation, the Benefit Board shall reduce either the ACP,
                    treating the reduction as an excess aggregate contribution,
                    or the ADP, treating the reduction as an excess
                    contribution. Such reduction shall be applied to all
                    eligible Highly Compensated Employees.

     D.   Participation by Direct Remittance

          1.   In addition to payroll deduction, Basic and Supplemental Deposits
               may be made to a Participant's Regular Account in accordance with
               the provisions of Articles IV.E., IX.A.3., X.B.2.d.(2) and
               X.C.1.c. (relative to temporary Employees; employees on military,
               governmental, or disability leave; and nonvested redeposits).

          2.   In the event a Participant is eligible to receive a refund
               pursuant to Article IV.C.2., such Participant may authorize that
               amounts, which were to be received, shall be deposited in  his
               Regular Account.

          3.   Supplemental Deposits to a Participant's Regular Account may be
               made by cash payment direct to the Trustee in accordance with
               regulations prescribed by the Benefit Board.

     E.   Temporary Employees--Insufficient Earnings

          Participants who are temporary Employees may make Basic and
          Supplemental Deposits to their Regular Accounts by direct cash payment
          to the Trustee if their earnings in the month of deduction are not
          sufficient to make such deposits by payroll deduction. Any month in
          which the Participant elects not to make such deposit will be
          considered a month of voluntary suspension in accordance with Article
          IX.B.

                                     IV-4
<PAGE>

     F.   Transfer of Funds to Trustee

          The amount of payroll deductions and cash payments so made shall be
          transferred monthly by Sentinel to the Trustee, and the Trustee shall
          hold the same for the respective Participants' Employee Accounts,
          subject to the provisions of the Plan.

     G.   Internal Revenue Code Limitations

          Notwithstanding anything else to the contrary in this Article IV.
          (Employee Participation), or in Article V. (Sentinel Contributions),
          Article VI. (Limitation on Annual Additions), or elsewhere in the
          Plan, contributions to this Plan and benefits under this Plan shall be
          limited as required by Sections 415, 401(k), and 401(m) of the Code
          and final Treasury regulations thereunder.

          No Participant shall be permitted to have Elective Deferrals made
          under this Plan, or any other qualified plan maintained by the
          Corporate Employer, during any taxable year, in excess of the dollar
          limitation contained in section 402(g) of the Code in effect at the
          beginning of such taxable year.

          A Participant may assign to this Plan any Excess Elective Deferrals
          made during a taxable year of the Participant by notifying the Plan
          Administrator on or before the date specified by the Plan
          Administrator of the amount of the Excess Elective Deferrals to be
          assigned to the Plan. A Participant is deemed to notify the Plan
          Administrator of any Excess Elective Deferrals that arise by taking
          into account only those Elective Deferrals made to this Plan.

          Notwithstanding any other provision of the Plan, Excess Elective
          Deferrals, plus any income and minus any loss allocable thereto, shall
          be distributed no later than April 15 to any Participant to whose
          account Excess Elective Deferrals were assigned for the preceding year
          and who claims Excess Elective Deferrals for such taxable year.

          "Elective Deferrals" shall mean any employer contributions made to the
          Plan at the election of the Participant, in lieu of cash compensation,
          and shall include contributions made pursuant to a salary reduction
          agreement or other deferral mechanism. With respect to any taxable
          year, a Participant's Elective Deferral is the sum of all employer
          contributions made on behalf of such Participant pursuant to an
          election to defer under any qualified CODA as described in section
          401(k) of the Code, any simplified employee pension cash or deferred
          arrangement as described in section 402(h)(1)(B), any eligible
          deferred compensation plan under section 457, any plan as described
          under section 501(c)(18), and any employer contributions made on the
          behalf of a Participant for the purchase of an annuity contract under
          section 403(b) pursuant to a salary reduction agreement. Elective
          Deferrals shall not include any deferrals properly distributed as
          excess annual additions.

          "Excess Elective Deferrals" shall mean those Elective Deferrals that
          are includible in a Participant's gross income under section 402(g) of
          the Code to the extent such Participant's Elective Deferrals for a
          taxable year exceed the dollar limitation under such Code section.
          Excess Elective Deferrals shall be treated as annual additions under
          the Plan, unless such amounts are

                                     IV-5
<PAGE>

          distributed no later than the first April 15 following the close of
          the Participant's taxable year.

          Determination of income or loss:  Excess Elective Deferrals
          shall be adjusted for any income or loss up to the date of
          distribution.

                                     IV-6
<PAGE>

V.   SENTINEL CONTRIBUTIONS
     ----------------------

     A.   Amount of Company Contributions

          Sentinel shall contribute out of its accumulated earnings and profits
          to a Participant's Regular Account an amount equal to 100 percent of
          each Participant's Basic Deposits, except as hereinafter provided in
          Article VI. Such contributions shall be paid to the Trustee at least
          monthly.

     B.   Additional Sentinel Contributions

          This is a profit sharing plan. Sentinel may from time to time
          voluntarily make additional contributions out of its accumulated
          earnings and profits subject to the following provisions, conditions,
          and limitations:

          1.   No such additional contribution shall be made unless the same is
               specifically authorized by the Board within two months of the
               date on which such additional contribution is to be made.

          2.   No such additional contribution shall be applicable to the
               employees of any Affiliated Company participating in the Plan
               unless such applicability to such employees is authorized by the
               board of directors of such Affiliated Company.

          3.   The aggregate amount of any such additional contribution made in
               any one calendar year shall not exceed 2 percent of the
               consolidated net income of Sentinel and its consolidated
               subsidiaries for the last preceding calendar year.

          4.   Each such additional contribution shall be paid to the Trustee
               and shall thereupon be distributed by the Trustee among the
               Employee Accounts of all Plan Participants to whom such
               additional contribution is applicable in proportion to the
               respective Basic Deposits which such Participants deposited in
               their Employee Accounts pursuant to the provisions of Article IV.
               during the six calendar months immediately preceding the month in
               which such additional contribution is authorized by the Board.

     C.   Transfer of Funds to Trustee

          The Trustee shall hold Sentinel 's contributions for Participants in
          their respective Employee Accounts, subject to the provisions of the
          Plan; and no part of those contributions shall be recoverable by
          Sentinel, nor shall they (except as hereinafter provided in Articles
          VI.A.2., VIII.A.2., VIII.A.3., VIII.A.4., VIII.A.5., X.B.2.f., X.B.5.,
          and X.C.1.c(1)) be used for or diverted to any other purpose.

                                      V-1
<PAGE>

VI.  LIMITATION ON ANNUAL ADDITIONS
     ------------------------------

     A.   Anything to the contrary notwithstanding:

          1.   The maximum Annual Additions deposited to a Participant's
               Employee Account in any year either solely under the Plan or
               under an aggregation of the Plan with all other Defined
               Contribution Plans of the Corporate Employer may not exceed the
               lesser of $30,000 (or such greater amount as may be allowable in
               accordance with regulations, rulings or other official
               announcements issued by the Secretary of the Treasury or his
               delegate) or 25% of the Employee's Defined Compensation for the
               year; nor,

          2.   When the Annual Additions are viewed in conjunction with a
               Participant's interest in all other Defined Benefit and Defined
               Contribution Plans of the Corporate Employer, including any
               interest of the Participant that has been assigned to an
               alternate payee pursuant to a Qualified Domestic Relations Order,
               the sum of the Defined Benefit Plan Fraction and the Defined
               Contribution Plan Fraction for any year shall not exceed 1.0.
               Sections 235(b)(3) and (4) of the Tax Equity and Fiscal
               Responsibility Act of 1982 shall be applied when computing the
               limitation under this Article VI.A.2.  If the limitation in
               Article VI.A.1. would be exceeded but for the language set out in
               this Article, the Annual Additions deposited under the Plan must
               be reduced and, or a Participant's Employee Deposits returned
               and, Corporate Employer Contributions removed from the
               Participant's Employee Account and applied to reduce the
               subsequent contribution of Sentinel under the Plan, to the extent
               necessary, as determined by the Benefit Board.  If the limitation
               in Article VI.A.2. would be exceeded but for the language set out
               in this Article, the benefits under the Defined Benefit Plans of
               the Corporate Employer shall be reduced to the extent necessary
               to avoid exceeding the limitation.

                                     VI-1
<PAGE>

VII. INVESTMENT PROVISIONS
     ---------------------

     A.   Investment Direction

          A Participant in the Plan shall instruct the Trustee in the form
          prescribed by the Benefit Board as to the Investment Direction for
          future deposits, contributions and income to his Employee Account,
          except that dividends on DuPont stock payable to a Participant's
          Employee Account on and after January 1, 1993, shall be invested in
          DuPont stock for the Participant's Employee Account if, on the date
          the dividend is payable into the Participant's Employee Account, any
          portion of the Participant's Employee Account is invested in DuPont
          stock.

          1.   Such direction shall be to invest in any one or more of the Plan
               Investment Options pursuant to Article VII. C., in multiples of 1
               percent totaling 100 percent for the Participant's Regular
               Account and for the Participant's Before Tax Account, separately.

          2.   Each Investment Direction shall be deemed a continuing direction
               unless changed by the Participant.

          3.   A Participant may change his Investment Direction in the manner
               prescribed by the Benefit Board.

     B.   Fund Transfer(s)

          Any Plan Member, except a Non-Spouse Beneficiary, may instruct the
          Trustee in the manner prescribed by the Benefit Board to sell, redeem,
          or liquidate any investments in his Employee Account and to transfer
          the proceeds to another Investment Option. Such Fund Transfers shall
          specify the number of units or shares of stock in an Investment Option
          Fund, as provided for in Article VII.C, within the Member's Regular or
          Before Tax Account that is to be transferred to another Investment
          Option Fund within the same Account. Such transfer shall be made only
          in the Account from which the proceeds originated. A Member may not
          transfer proceeds from his Regular Account to his Before Tax Account
          or vice-versa.

     C.   Investment Option Funds

          The Trustee shall provide for the following Investment Option Funds
          for Plan Members.

          1.   Option A: DuPont Stock Fund

               The purchase of shares of DuPont common stock. Such purchases may
               be made in the open market or from DuPont if it shall have made
               treasury or authorized but unissued shares available for such
               purchases, in which event the purchase price shall be the closing
               price of such stock as reported on the New York Stock Exchange-
               Composite Transactions on the last trading day preceding the date
               of such purchase from DuPont.

          2.   Option B: Fixed Income Fund

               The purchase of units of participation in the Fixed Income Fund.
               The term "Fixed Income" or "Fixed Income Fund" shall mean an
               account established by agreement between the Trustee and one or
               more insurance companies or other financial institutions as may
               from time to time be designated by the

                                     VII-1
<PAGE>

               Benefit Board or, if not so designated, as selected by the
               Trustee in its discretion. The agreement shall provide for the
               payment of interest at a predetermined rate by such insurance
               company or other financial institution on all deposits made to
               the Fixed Income Fund. Short-term obligations of the United
               States Government, commercial paper or other investments of a
               short-term nature may be purchased and held pending the deposit
               of funds which such insurance company or other financial
               institution. All deposits to the Fixed Income Fund shall be
               expressed as units of participation in the Fixed Income Fund,
               which shall consist of all deposits to the Fixed Income Fund and
               all interest credited or accrued to such deposits pursuant to the
               agreement. No Member shall have any ownership in any particular
               asset in the Fixed Income Fund. The Fixed Income Fund shall be
               operated in accordance with the provisions established by the
               Benefit Board, which shall be equally applicable to all Members;
               provided, however, that the requirements set forth in any Fixed
               Income Fund agreement for use under the Plan shall be obligatory
               and binding upon all concerned with the same force and effect as
               though such requirements were set forth at length in and
               constituted part of this Plan.

          3.   Option C: Mutual Funds

               The purchase of shares in one or more mutual funds
               contained in a family of mutual funds designated by the Trustee
               with the advice and consent of the Benefit Board, as directed by
               Members.

          4.   Option D: Three Way Asset Allocation Fund

               The purchase of units in a three way asset allocation fund
               consisting of a portfolio diversified among the stock, bond and
               cash sectors of the securities market place. Assets invested
               pursuant to this Option D. shall be transferred among these
               sectors in a manner and to such extent as the Trustee or
               designated Investment Manager shall elect.

          5.   Option E: Loan Account Fund

               The unpaid principal of a loan granted in accordance with Article
               XI. of the Plan. This option shall be designated the Loan Account
               Fund.

     D.   Uninvested Funds

          Any funds in the hands of the Trustee at any time on and after January
          1, 1996, not invested pursuant to Fund Transfers or Investment
          Directions of the Member as above provided, shall be held by the
          Trustee in the Fixed Income Fund.

     E.   Trustee Action

          The Trustee will comply with Investment Directions and Fund Transfers
          of a Member as soon as practicable after receipt thereof.

          In the event an Investment Option, or any mutual fund designated under
          Option C. is discontinued under the Plan, notice to such effect shall
          be given to all Members and such Members shall be given the
          opportunity to issue a new Investment Direction affecting future
          deposits and income subject to such discontinued Option or fund and a
          Fund Transfer directing the sale of units or shares in

                                     VII-2
<PAGE>

          the discontinued Option or fund and the transfer of such proceeds to
          any other Option or fund provided pursuant to Article VII.C. Such
          notice shall also provide that the failure of a Member to issue a new
          Investment Direction or a Fund Transfer shall be deemed to be an
          Investment Direction or a Fund Transfer specifying investment in an
          Option or fund as specified in the notice.

          If a Member fails to issue a new Investment Direction or a Fund
          Transfer with respect to future deposits and income or units or shares
          invested in or directed to be invested in a discontinued Option or
          fund, the Trustee shall sell such units or shares and invest the
          proceeds and any future deposits and income as specified in the notice
          provided to all Members.

          The Trustee may, in accordance with regulations to be prescribed by
          the Benefit Board, for the purpose of reducing brokerage commissions
          and other expenses, defer the execution of instructions to purchase or
          sell securities pursuant to Option A. until the Trustee has
          accumulated instructions to purchase or sell the quantities prescribed
          in such regulations. The Trustee in its discretion, may limit the
          daily volume of its purchases or sales of DuPont stock to the extent
          that such action is deemed by the Trustee to be in the best interest
          of the Members from whom it has received instructions for such
          purchases or sales.

     F.   Trustee--Maintenance of Plan Assets

          All cash and securities in Employee Accounts shall, until disposed of
          pursuant to the provisions of the Plan, be held in the possession of
          the Trustee or its designated agent. Transferable securities may be
          registered in the name of the Trustee or in the name of its nominee.
          Nontransferable government bonds shall be issued in such name or names
          as the Trustee may elect, subject to any applicable laws or
          regulations at the time in effect with respect thereto. In the sole
          discretion of the Trustee, investments in a particular security issue
          made at the instruction of more than one Member may be represented by
          a single bond or a single stock certificate, as the case may be.

          1.   Shares of stock of DuPont included in the Employee Account of a
               Member as of the record date shall be voted or caused to be voted
               at meetings of the stockholders of the Company or any adjournment
               thereof in accordance with written instructions given by such
               Member to the Trustee in such form as prescribed by the Benefit
               Board.  The Trustee shall not have the voting rights with respect
               to any shares of stock of DuPont held in trust pursuant to the
               terms of the Plan for which voting instructions for a particular
               stockholder's meeting are not received.

          2.   In the event of any distribution to all stockholders of DuPont
               of any rights to purchase any securities, such rights pertaining
               to the shares of stock held under the Plan shall be dealt with
               and disposed of by the Trustee in accordance with the following
               provisions, conditions, and limitations:

               a.   The Trustee shall notify each Member whose Employee Account
                    includes shares of DuPont stock to which the purchase rights
                    pertain concerning the distribution of such rights.  Such
                    notice shall specify a period of time (as prescribed by the
                    Benefit Board) within which the Member may elect that such
                    rights pertaining to

                                     VII-3
<PAGE>

                    any share of stock held in his Employee Account should be
                    allowed to expire by its own terms.

               b.   If the Member elects that such purchase rights should be
                    allowed to expire, he shall notify the Trustee to that
                    effect within such period of time and in such form and
                    manner and subject to such other regulations as the Benefit
                    Board may prescribe.

               c.   After the expiration of the period of time prescribed as
                    aforesaid, the Trustee shall endeavor to sell all of the
                    purchase rights with regard to which the said Trustee did
                    not receive an instruction from the Member to which such
                    rights were applicable.

                    The total net proceeds realized from such sales shall be
                    credited pro rata to the Employee Accounts of the Members
                    entitled thereto (i.e., in proportion to the number of such
                    purchase rights pertaining to the shares of DuPont stock
                    held in respect of the Employee Accounts of such Members but
                    not including those shares in the Employee Accounts of
                    Members who elected to allow the rights allocated to their
                    Employee Accounts to expire). The amounts so credited to the
                    Employee Accounts of Members shall for all purposes of the
                    Plan be treated as income.

               d.   In no event may the Trustee exercise for the Employee
                    Account of any Member any purchase rights pertaining to the
                    shares of stock held under the Plan.

          3.   The assets of the Fixed Income Fund and the Three-Way Asset
               Allocation Fund under this Plan may be held by the Trustee in
               trust in common with funds of the same name under the Investment
               Plan for Salaried Employees of Consol Inc. and the Thrift Plan
               for Employees of Conoco Inc.  In such case, the Trustee shall be
               under no duty to earmark or keep separate the assets of such
               commingled funds and a determination on the valuation date of the
               value of such funds under this Plan shall be determined in
               conjunction with the corresponding determinations made under
               Options B. and D. of Article VII.C. of the Investment Plan for
               Salaried Employees of Consol Inc. as though such funds under this
               Plan and the corresponding funds under the Investment Plan for
               Salaried Employees of Consol Inc. were one fund for this purpose.
               The Trustee shall, however, maintain a separate account
               reflecting the equitable share in the assets of the Fixed Income
               Fund and the Three-Way Asset Allocation Fund under this Plan and
               the corresponding funds under the Investment Plan for Salaried
               Employees of Consol Inc. and the Thrift Plan for Employees of
               Conoco Inc. Sentinel may, at any time, direct the Trustee to
               segregate and withdraw the equitable share in such assets of the
               Fixed Income Fund and the Three-Way Asset Allocation Fund of this
               Plan.  The Trustee's valuation of assets for the purpose of such
               withdrawals shall be conclusive.

                                     VII-4
<PAGE>

VIII.  CREDITS AND CHARGES TO EMPLOYEE ACCOUNTS
       ----------------------------------------

       A. Allocation of Income and Costs on Investments

          1.   All interest, dividends, and other income received by the Trustee
               and all gains or losses upon the sale or redemption of
               investments in the Member's Regular or Before Tax Account, as
               determined by the Trustee, shall be credited or charged to such
               Member's Employee Account.

          2.   The share value of securities in a Member's Employee Account
               purchased pursuant to Option A. shall be based on the closing
               price of such securities as calculated and provided to the
               Trustee by the New York Stock Exchange ("NYSE") at the end of
               each NYSE business day.

               The cost to a Member's Employee's Account of securities
               purchased under Option A. shall be the daily average weighted
               purchase price of all securities purchased by the Trustee on the
               same day at the direction of Members.  The proceeds credited to a
               Member's Employee Account upon the sale or redemption of such
               securities shall be based on the daily average weighted sale
               price received by the Trustee for all securities sold by Trustee
               on the same day at the direction of Members.

               Brokerage commissions, transfer taxes, and other charges and
               expenses in connection with the purchase or sale of securities
               shall be added to the cost of such securities or deducted from
               the proceeds thereof, as the case may be. Taxes, if any, on any
               assets held by the Trustee or income therefrom which are payable
               by the Trustee shall be charged against the Members' Employee
               Accounts as the Trustee shall determine.

          3.   The unit value of units of participation purchased pursuant to
               Option B. shall be based on the accrued value, which shall
               include principal value plus accrued interest, of all investment
               vehicles within the fund divided by the total outstanding units
               within the Plan as of the close of the previous business day.
               The unit value of units of participation shall include all costs
               and charges used to establish the unit value of the units of
               participation.  The cost to a Member's Employee Account of units
               of participation purchased pursuant to Option B. and the proceeds
               credited to a Member's Employee Account upon the sale of units of
               participation in Option B. shall be based on the unit value as of
               the close of the previous business day.

          4.   The share value of any Merrill Lynch mutual fund and the Merrill
               Lynch Equity Index Trust purchased under Option C. shall be the
               Net Asset Value calculated by Merrill Lynch Asset Management,
               which shall be calculated once each day the New York Stock
               Exchange is open for trading.  Such Net Value shall include all
               costs and charges used by Merrill Lynch Asset Management to
               establish the Net Asset Value.

               The share price of the Fidelity Megellan Fund purchased pursuant
               to Option C. shall be the Net Asset Value as determined by
               Fidelity Service Co. on each New York Stock Exchange Business
               Day. Such Net Asset Value shall include

                                    VIII-1
<PAGE>

               all costs and charges used by Fidelity Service Co. to establish
               the Net Asset Value.

          5.   The unit value of units purchased under Option D. shall be
               calculated by Wells Fargo Nikko Investment Advisors each business
               day.  Such unit value shall include all costs and charges used by
               Wells Fargo Nikko Investment.

                                    VIII-2
<PAGE>

IX.  SUSPENSION OF DEPOSITS
     ----------------------

     A.   Involuntary Suspension of Deposits

          If a Participant is absent from the performance of his duties for
          Sentinel, and, as a consequence of such absence, his Compensation for
          any calendar month is sixty percent, or less, of his normal
          Compensation for such month, all deposits to his Employee Account with
          respect to such month shall be automatically suspended; subject,
          however to the following limitations and conditions:

          1.   If a Participant is absent pursuant to a Company approved leave
               of absence, the automatic suspension of such deposits may
               continue only for the duration of such leave of absence.  If the
               Participant is absent for any other reason, the automatic
               suspension of deposits may not continue without interruption for
               longer than 12 months.

          2.   If a Participant is absent pursuant to a Company approved leave
               of absence, or because of his sickness or other disability, the
               period of automatic suspension of deposits shall be included in
               determining the length of such Participant's years of
               participation in the Plan.

          3.   If a Participant is absent pursuant to a company-approved leave
               of absence under Sentinel's military leave policy or serving the
               government in a nonmilitary capacity, or because of sickness or
               other disability, then, in any such event, he may elect, in the
               manner prescribed by the Benefit Board, to continue to make
               deposits to his Regular Account (and thus avoid automatic
               suspension thereof).  A Participant making such an election may
               not change his rate of deposit during such absence.  In the event
               of such election, the Participant's deposits may, in accordance
               with regulations prescribed by the Benefit Board, either be
               deducted from any Compensation or other regular payments which
               such Participant may be entitled to receive from Sentinel, or may
               be paid currently in cash by the Participant to the Trustee.
               Failure of a Participant to make such cash deposit on the date
               when it becomes payable shall be treated as an election by him to
               permit his deposits to be automatically suspended, as hereinabove
               provided in this Article IX.A. from and after the date of his
               last previous deposit.

     B.   Voluntary Suspension of Deposits

          A Participant, by direction to the Benefit Board in the manner
          prescribed by the Benefit Board, or by electing not to make a direct
          cash payment in accordance with Article IV.D., may voluntarily elect
          to suspend all monthly Basic and Supplemental Deposits under the Plan,
          subject, however, to the following limitations:

          1.   A voluntary suspension by direction or failure to elect or to
               make a direct remittance will be applicable to all deposits to
               the Plan;

          2.   A voluntary suspension will remain in effect for the number of
               months elected by the Participant unless the Participant shall
               revoke such election by making an election pursuant to Article
               IV.B.

                                     IX-1
<PAGE>

          3.   The right of a Participant to make cash Supplemental Deposits to
               his Regular Account shall not be affected by a voluntary
               suspension;

          4.   The nonreceipt of a direct remittance from a temporary Employee,
               in accordance with Article IV.E. within 30 days of the mailing of
               notification of such right, will be deemed to be a voluntary
               suspension;

     C.   Company Contributions During Suspension

          During the period or periods of automatic and/or voluntary suspension
          of monthly deposits as provided in Article IX.A. and B., Company
          Contributions to the Employee Account of such Participant will be
          automatically and correspondingly suspended. Company Contributions not
          made during any such period of suspension shall not be accumulated or
          carried forward for later payment.

                                     IX-2
<PAGE>

X.   WITHDRAWALS
     -----------

     A.   Full Withdrawals--Retirement

          1.   A Participant or Transferred Member shall be entitled to his
               entire Employee Account in the event of a normal, early, or
               incapacity retirement from the Retirement Plan.  At any time
               prior to such retirement, a Participant or Transferred Member
               may, by written direction to the Trustee in the manner prescribed
               by the Benefit Board, make an election to receive his Employee
               Account pursuant to the options set forth in Article X.

          2.   Defer to Age 70 1/2

               Any Plan Participant or Transferred Member who is entitled to
               normal, early, or incapacity retirement under the Retirement Plan
               may, prior to such retirement, by direction to the Trustee in the
               manner prescribed by the Benefit Board, make an election to defer
               the withdrawal of his Employee Account. In the event that a
               Participant or a Transferred Member makes such an election:

               a.   No further Basic Deposits pursuant to Article IV.,
                    Supplemental Deposits or contributions pursuant to Article
                    V. shall be made to his Employee Account after the date of
                    his retirement;

               b.   During the period of time following his retirement, such
                    Retired Member (or, in a proper case, his legal
                    representative or designated beneficiary) shall be entitled
                    to withdraw his entire Employee Account, under the same
                    terms applicable to withdrawals pursuant to Article X.B., or
                    make one or more partial withdrawals pursuant to terms of
                    Article X.C; and

               c.   Payments in the form of a Lifetime Periodic Payment
                    calculated on the actuarial life of the Member will commence
                    no later than April 1 of the calendar year following the
                    calendar year in which a Retired Member attains age 70 1/2,
                    if such Retired Member (or, in a proper case, his legal
                    representative or designated beneficiary) has not withdrawn
                    his entire Employee Account then held by the Trustee or made
                    an election pursuant to Article X.A.3. as provided by
                    Article X.A.2.d.

               d.   Prior to attaining age 70 1/2, such Retired Member may elect
                    to receive his Employee Account pursuant to Article X.A.3.

                                      X-1
<PAGE>

          3.   Periodic Payment Options

               If a Retired Member receiving payments pursuant to one of the
               options listed in paragraphs a., b., c., d. e. or f. below is
               reemployed by Sentinel, payments shall cease at the time such
               Retired Member is rehired. If payments cease and the Retired
               Member subsequently is entitled to an early, normal or incapacity
               retirement, he may designate any form of distribution of the
               balance of his Employee Account permitted under Article X.A. of
               the Plan. The balance of his Employee Account shall include
               contributions, if any, made after reemployment and earnings on
               those contributions. If payments cease pursuant to this
               paragraph, they shall resume no later than April 1 of the year
               following the year in which the Employee reaches age 70 1/2.

               Any Retired Member, who has not attained age 70 1/2 and who,
               before January 1, 1993, received one or more payments under the
               Lifetime Cash Payment Option or the Fixed Cash Payment Option as
               they existed prior to January 1, 1993, or who made an election
               pursuant to Article X.A.2.d. or Article X.A.3.e. or f. may revoke
               his prior election and elect to receive his Plan assets pursuant
               to Article X.A.3.c. or d. as amended effective January 1, 1993.

               Any Retired Member, including a Retired Member who retired prior
               to January 1, 1993, who has not attained the age of 70 1/2 and
               who has received one or more Periodic Payments pursuant to this
               Article X.A.3. may, in the manner designated by the Benefit
               Board, revoke his election and elect any other Periodic Payment
               Option under this Article X.A.3., effective the month following
               receipt by the Benefit Board of the revocation and new election.
               A Retired Member may make such a revocation and new election once
               each calendar year.

               Any Retired Member, including a Retired Member who retired prior
               to January 1, 1993, who has not attained age 70 1/2 and who has
               received one or more payments under the Lifetime Cash Payment
               Option or the Fixed Cash Payment Option as they existed prior to
               January 1, 1993, Article X.A.3.e. or f., or one or more Periodic
               Payments under this Article X.A.3. may, in the manner designated
               by the Benefit Board, revoke his election and elect to defer
               receipt of his Employee Account pursuant to Article X.A.2.

               a.   Periodic Payment Option--Lifetime

                    A Participant or Transferred Member, prior to his effective
                    retirement date or, a Retired Member pursuant to an election
                    made in accordance with Article X.A.2.d. shall, in the
                    manner designated by the Benefit Board, elect to have the
                    Lifetime Periodic Payment Option calculated based on his
                    actuarial life or on his and his beneficiary's actuarial
                    lives. The electing Member's Employee Account shall be
                    valued as of the effective date of the Periodic Payment
                    Option election and thereafter, on December 31 of each year.
                    In the event of an election to receive annual payments
                    pursuant to this Option, the amount of each such annual
                    payment shall be calculated by dividing the value of the
                    Member's Employee Account on the effective date of the
                    Periodic Payment Option election (or the December 31 next
                    preceding such payment, as the case may be) by

                                      X-2
<PAGE>

                    the number of years then remaining in the electing Member's
                    actuarial life (or if the Member so elects, in the actuarial
                    lives of the Member and the beneficiary designated at the
                    time of the Periodic Payment Option election).

                    In the event an election is made to receive monthly payments
                    pursuant to this Option, the amount of such monthly payments
                    shall be calculated by dividing the annual payment that
                    would be received, calculated as provided in this Article
                    X.A.3.a, by 12.

                    If an election is made to receive either monthly or annual
                    payments pursuant to this Option, the assets in the electing
                    Member's Before Tax and Regular Accounts shall be liquidated
                    on a pro rata basis, based on the value of each investment
                    in his Before Tax and Regular Accounts to the extent
                    necessary to make such payments. The assets in the Before
                    Tax and Regular Accounts shall be distributed on a pro rata
                    basis based on the value the Before Tax Account and the
                    Regular Account has to the Member's entire Employee Account
                    to the extent necessary to make such payments.

               b.   Periodic Payment Option--Variable

                    A Participant or a Transferred Member, prior to his
                    effective retirement date, or a Retired Member pursuant to
                    an election made in accordance with Article X.A.2.d., shall,
                    in the manner designated by the Benefit Board, designate the
                    number of years over which he elects to receive payments,
                    provided however, that such number of years shall not be
                    less than two years nor more than a period which would pay
                    the account balance during the electing Member's actuarial
                    life or if the electing Member has designated a beneficiary,
                    over the actuarial lives of the electing Member and his
                    beneficiary. The electing Member's Employee Account shall be
                    valued as of the effective date of the Periodic Payment
                    Option election and on December 31 of each year following
                    such election. In the event an election is made to receive
                    monthly payments pursuant to this Option, the amount of each
                    such monthly payment shall be calculated by dividing the
                    value of the electing Member's Employee Account on:

                                      X-3
<PAGE>

                    (i)  the effective date of his Periodic Payment Option
                         election by the number of months under which he has
                         elected to receive monthly  payments; and

                    (ii) on January 1 of each year subsequent to the effective
                         date of his Periodic Payment Option election by the
                         number of months under which he elected to receive
                         payments less the number of months since the effective
                         date of his Periodic Payment Option election.

                    In the event an election is made to receive annual payments
                    pursuant to the terms of this Option, the amount of such
                    annual payment shall be calculated by dividing the value of
                    the electing Member's Employee Account as of:

                    (i)  the effective date of his Periodic Payment Option
                         election by the number of years under which he has
                         elected to receive annual  payments; and

                    (ii) on January 1 of each year subsequent to the effective
                         date of his Periodic Payment Option by the number of
                         years under which he elected to receive annual payments
                         less the number of years since the effective date of
                         his Periodic Payment Option election.

               c.   Periodic Payment Option--Fixed

                    A Participant or a Transferred Member, prior to his
                    effective retirement date or, a Retired Member, pursuant to
                    an election made in accordance with X.A.2.d., shall in the
                    manner designated by the Benefits Board, elect to have the
                    Fixed Periodic Payment Option calculated on the basis of an
                    annual or monthly amount designated by the electing Member.
                    The designated amount shall be paid on an annual or monthly
                    basis to the electing Member until such time as his Employee
                    Account balance is zero.

               d.   Periodic Payment Option--Level

                    A Participant or Transferred Member, prior to his effective
                    retirement date or, a Retired Member, pursuant to an
                    election made in accordance with Article X.A.2.d., shall in
                    the manner designated by the Benefit Board, elect to have
                    the Level Periodic Payment Option calculated by amortizing
                    the electing Member's Employee Account balance over the
                    actuarial life of the electing Member at an interest rate
                    that approximates the expected rate of return for the Fixed
                    Income Fund as of the month payments under this Article
                    X.A.3.d. commence.

                    If the actual interest rate earned over the duration of the
                    payments is greater than the established rate of return, any
                    remaining account balance will be included in the final
                    payment. If the actual interest rate earned over the
                    duration of the payments is less than

                                      X-4
<PAGE>

                    the established rate of return, payments shall only be made
                    until the account balance is zero.

                    In the event an election is made to receive monthly periodic
                    payment under this Option, the amount of such monthly
                    payments shall be calculated by dividing the annual periodic
                    payment that would be received, calculated as provided in
                    this Article X.A.3.d., by 12.

     B.   Full Withdrawal--Other Than Upon Retirement

          1.   Plan Mandated Withdrawals

               Payment of the vested portion of an Employee Account shall be
               paid as soon as is practical to a Terminated Member after his
               termination of employment with Sentinel and as soon as is
               practical to an Alternate Payee, or a Non-Spouse Beneficiary
               Member upon the Trustee's receipt of a request for a lump sum
               payment, but no later than 12 months following the event of the
               death of the Member whose Employee Account is to be distributed
               to the Non-Spouse Beneficiary.

               Provided, however, that a lump-sum payment of the amount in an
               Employee Account to which a Terminated Member or an Alternate
               Payee is entitled, which has a vested balance that exceeds
               $3,500, or a vested balance of less than $3,500 if the Terminated
               Member has been terminated at a time he was subject to Article
               X.B.2.c.(1). (termination due to a spousal transfer, job
               abolishment or incapacity), shall not be made during the lifetime
               of the Terminated Member or Alternate Payee unless the Terminated
               Member or Alternate Payee, consents in writing to the
               distribution or until April 1 of the year following the year in
               which the Terminated Member or the Member from whom the Alternate
               Payee received his Employee Account reaches age 70 1/2.

               The amount of any loan balance in any Member's Employee Account
               shall be included in determining whether an Employee Account has
               a vested balance of $3500 or less, but any distribution of a Loan
               Balance shall be treated as a Deemed Withdrawal and no further
               cash or distribution in kind shall be made.

                                      X-5
<PAGE>

          2.   Member Initiated Regular Account Withdrawals

               Any Member, by written direction to the Trustee in the manner
               prescribed by the Benefit Board, shall be entitled to withdraw
               his Regular Account as follows:

               a.   If he is vested, he may withdraw his entire Regular Account.

               b.   If he is not vested, he may withdraw the greater of either:

                    (1)  An amount equal to the sum of his total deposits to the
                         date of withdrawal and all income added to his Regular
                         Account (but not more than his entire Regular Account).

                    (2)  The value of his entire Regular Account less an amount
                         equal to the total of Sentinel's contributions to his
                         Regular Account to the date of withdrawal.

                    (3)  Any Company contributions remaining in the Member's
                         Employee account shall be forfeited except as provided
                         in X.B.2.d.(2).

               c.   (1)  If a Participant is not vested and the sole reason for
                    the termination of his employment by Sentinel was (i) that
                    his spouse was transferred by Sentinel to an employment
                    location outside the immediate geographical area, (ii) that
                    the position or job he held with Sentinel was abolished, or
                    (iii) because of his incapacity, he may withdraw his entire
                    Regular Account.  Withdrawals under this paragraph arising
                    from the termination of a Participant due to a transfer of
                    his spouse by Sentinel, the fact that the position or job he
                    held with Sentinel was abolished, or the incapacity of such
                    Participant are subject to prior approval by the Benefit
                    Board, provided that in the case of a termination for the
                    reason of incapacity, such approval by the Benefit Board
                    shall be based upon one or more reports by qualified medical
                    doctors.  Every Participant, the termination of whose
                    employment by Sentinel falls within the terms of this
                    Article X.B.2.c., shall be treated the same as all other
                    such Participants under the same or similar circumstances.

               d.   Conditions of Withdrawal from Regular Account

                    Withdrawals by a Participant from his Employee Account shall
                    be subject to the following conditions:

                    (1)  The withdrawing Participant shall be ineligible to make
                         Basic Deposits to the Plan for a period of six months
                         from the date of withdrawal.  Suspensions under this
                         Article X.B.2. and suspensions under X.B.3. and X.C.
                         shall run concurrently.

                    (2)  If subsequent to a withdrawal described in Article
                         X.B.2.b. and within the limits of subparagraphs (i) and
                         (ii) below, such withdrawing Participant redeposits to
                         his

                                      X-6
<PAGE>

                         Regular Account the amount specified in subparagraph
                         (i) below, then in such event, Sentinel shall
                         contribute to the Regular Account of the Participant an
                         amount equal to the amount of Company Contributions
                         forfeited on the date of withdrawal.

                         (i)  Any Member who made a complete withdrawal after
                              termination of employment and any Participant who
                              terminated participation in the Plan at the time
                              he made the withdrawal, must redeposit the full
                              amount of the withdrawal, valued as of the date of
                              withdrawal. If the Participant did not terminate
                              participation in the Plan at the time of
                              withdrawal, he must redeposit either the total
                              amount of Basic Deposits withdrawn or the total
                              amount of the withdrawal valued as of the date of
                              withdrawal.

                         (ii) Only a Participant or an employee of an Affiliated
                              Company who has an Employee Account, which does
                              not consist exclusively of funds received by the
                              Trustee under Article XXIII., in the Plan is
                              entitled to make the redeposit described above and
                              the redeposit must be made no later than the close
                              of the first period of five consecutive One-Year
                              Breaks-in-Service commencing after the withdrawal.

               e.   Upon termination or partial termination of the Plan by
                    Sentinel  or any affiliate which has adopted the Plan, or
                    upon complete discontinuance of all Company Contributions
                    under the Plan or complete discontinuance of contributions
                    thereunder by any affiliate of Sentinel, the rights of
                    Participants affected by such termination, partial
                    termination, or complete discontinuance of contributions, to
                    their respective Regular Account balances shall become
                    nonforfeitable and such Participants shall be entitled to
                    withdraw their entire Regular Accounts.

               f.   If a Member terminates employment with Sentinel at a time
                    when he is not entitled to withdraw his entire Regular
                    Account, after five One-Year Breaks-in-Service, he
                    immediately shall forfeit that part of his Regular Account
                    that is the difference between the full value of his Regular
                    Account on the date the forfeiture occurs and the amount he
                    is entitled to withdraw under the provisions of Article
                    X.B.2.b. on the date the forfeiture occurs.

          3.   Member Initiated Before Tax Account Withdrawals.

               Any Member, by written direction to the Trustee in the manner
               prescribed by the Benefit Board shall be entitled to withdraw his
               Before Tax Account upon retirement, separation from service, or
               upon attaining the age of 59 1/2. Any Member, by written
               direction to the Trustee in a form prescribed by the Benefit
               Board, shall be entitled to withdraw his Before Tax

                                      X-7
<PAGE>

               Account upon the disposition by Sentinel of substantially all of
               the assets (within the meaning of Code section 409(d)(2)) used by
               Sentinel in a trade or business of Sentinel or upon the
               disposition by Sentinel of its interest in a subsidiary (within
               the meaning of Code section 409(d)(3)), provided, however, that
               the Member continues employment with the corporation acquiring
               such assets or with the subsidiary, and provided that the
               distribution is in the form of a lump sum as defined in section
               401(k)(10)(B)(ii) of the Code. In the event of the death of a
               Member, his designated beneficiary shall be entitled to withdraw
               the Member's Before Tax Account. Prior to age 59 1/2 and while
               employed by Sentinel, a Participant may not make a withdrawal
               from his Before Tax Account except upon prior approval of the
               Benefit Board, or one to whom the Benefit Board has specifically
               delegated the authority to determine Hardship, who shall grant a
               full withdrawal from his Before Tax Account only upon proof of
               Hardship requiring the entire sum of his Before Tax Account. A
               Hardship withdrawal of an amount less than the entire Employee
               Account shall be made pursuant to Article X.C.2. A Participant
               who is making a complete withdrawal for reason of Hardship shall
               be required to first withdraw funds from his Regular Account as
               provided to meet the definition of Hardship in Article II.W. A
               Participant shall not be granted a withdrawal under this Article
               X.B.3. unless he proves he meets the definition of Hardship set
               forth in Article II.W. The Benefit Board, or its delegee will
               determine whether the definition of Hardship has been met.

               If the withdrawing Member is also a Participant in the Plan, he
               shall be ineligible to participate in the Plan for a period of
               six full months from the date of his withdrawal, except that if
               the withdrawing Participant has a Regular Account subsequent to
               the withdrawal, deposits to his Employee Account may continue
               during this six month period, except as otherwise provided in
               Article II.W.B.2. Suspensions under Articles X.B.2., X.B.3. and
               X.C. shall run concurrently.

          4.   Special Provisions Applicable to Transferred Employees

               Withdrawals pursuant to the provisions of this Article X.B.4.
               shall be subject to the following conditions:

               a.   A transfer of employment from Sentinel to an Affiliated
                    Company or a corporation which has adopted a profit sharing
                    plan administered by an Affiliated Company, or between
                    Affiliated Companies or corporations which have adopted a
                    profit sharing plan administered by an Affiliated Company,
                    shall not be considered as a termination of or separation
                    from employment.

               b.   If a Member is transferred at the request or with the
                    consent of Sentinel to the employ of an employer not
                    participating in the Plan or to otherwise noneligible
                    employment, such Member may continue his Employee Account
                    during the period of such employment but with no further
                    deposits or contributions during such period, except as
                    provided for in Article X.B.4.d.  If such transfer is to the
                    employ of an Affiliated Company or corporation which has
                    adopted a profit sharing plan administered by an Affiliated
                    Company, participation in the profit sharing plan of such
                    corporation shall be

                                      X-8
<PAGE>

                    included in determining the Member's years of participation
                    and years of service in this Plan. If such transfer is to
                    the employ of an employer which does not permit
                    participation in the profit sharing plan of an Affiliated
                    Company, the period of employment with such employer shall
                    be included in determining years of participation and years
                    of service in this Plan.

               c.   A Member who is or has been transferred at the request or
                    with the consent of Sentinel, from Sentinel to an Affiliated
                    Company or a corporation which has adopted a profit-sharing
                    plan administered by an Affiliated Company, may request the
                    Trustee, in the manner prescribed by the Benefit Board, to
                    transfer his entire Employee Account in the Plan to the
                    profit-sharing plan maintained by his employer, unless his
                    Employee Account is collaterally pledged pursuant to Article
                    XVI.  The transfer of an Employee Account will not be
                    considered a withdrawal from this Plan.  The Benefit Board
                    shall determine whether the transfer of an Employee Account
                    shall be in cash or in kind on the basis of uniform rules
                    applicable to all Members on the same basis.

               d.   A Member who is or has been transferred from Sentinel to an
                    Affiliated Company, which is a member of the DuPont
                    controlled group or a corporation which has adopted a
                    profit-sharing plan administered by an Affiliated Company,
                    which is a member of the DuPont controlled group and who
                    continues his Employee Account pursuant to X.B.4.b., may
                    make the maximum amount of Supplemental Deposits allowable
                    under Article II.RR. to his Employee Account.

          5.   Loss of Part of Regular Account on Withdrawal

               In case any Member shall, by reason of any withdrawal under any
               provision of this Article X., lose his interests and rights in
               any part of his Employee Account, the amount so lost shall be
               applied to reduce the subsequent contributions of Sentinel under
               the Plan, or if the Plan shall be terminated, the Trustee shall
               credit any amount not so applied ratably to the Employee Accounts
               of all other Participants in the Plan at the time of termination.
               To the extent required for such purposes, the Trustee shall sell
               or turn in for redemption any security purchased at the direction
               of the withdrawing Member.

          6.   Method of Payment

               Upon any withdrawal under the provisions of this Article X.
               except pursuant to Article X.A.3., the Trustee shall determine
               whether to make payment in cash or in kind, or both, and for the
               purpose of any such payment in cash, the Trustee may sell or turn
               in for redemption any security that shall have been purchased at
               the direction of the withdrawing Member. To the extent
               practicable, the Trustee will make payment in kind only if the
               withdrawing Member shall so request. For the purpose of valuing
               an Employee Account in connection with any withdrawal under the
               provisions of this Article X. or Article XIX.B. and for the
               purpose of any distribution in kind, securities shall be valued
               pursuant to

                                      X-9
<PAGE>

               uniform regulations to be issued and published by the Benefit
               Board or as otherwise set out in the Plan.

     C.   Partial Withdrawals

          1.   Member Initiated Regular Account Withdrawals.

               By written direction to the Trustee in the manner prescribed by
               the Benefit Board, any Member, except a Non-spouse Beneficiary,
               may make a maximum of three partial withdrawals from his Regular
               Account each calendar year. Notwithstanding the preceding
               sentence, at no time may:

               (i)    a Member withdraw more than the remaining credit to his
                      Regular Account, exclusive of any loan balance;

               (ii)   a Member withdraw his entire Regular Account under this
                      Article X.C.1., unless such Member also has a  Before Tax
                      Account;

               (iii)  nonvested Member withdraw an amount that is not reduced by
                      the amount of Company Contributions that must remain in
                      his Employee Account to ensure that he does not receive an
                      amount greater than the amount to which he would be
                      entitled if he were making a withdrawal pursuant to
                      Article X.B.2.b.

               Partial withdrawals shall be subject to the suspension provisions
               of Article X.C.1.b.

               a.   Sequence of Withdrawal of Funds.

                    For the purpose of determining whether a withdrawal subject
                    to a suspension as described in Article X.C.1.b. has
                    occurred, all partial withdrawals shall be made in the
                    following sequence from a Participant's Regular Account. If
                    the Participant is not entitled to withdraw Company
                    Contributions, the sequence of withdrawal shall be as stated
                    below but omitting the items referring to Company
                    Contributions.

                    (1)  Supplemental Deposits;

                    (2)  Rollover Assets;

                    (3)  Earnings (including profit and loss);

                    (4)  Basic Deposits in the Regular account more than 24
                         months;

                    (5)  Company Contributions in the Regular Account more than
                         24 months;

                    (6)  Basic Deposits in the regular Account 24 months or
                         less; and

                    (7)  Company Contributions in the Regular Account 24 months
                         or less;

               b.   Suspensions Due to Partial Withdrawal.

                    In the case of any partial withdrawal under Article X.C.1.
                    or XVI.B.4., of the type of funds described in X.C.1.a(5),
                    (6) or (7) [[X.C.1.a(6) or (7)]], a Member,

                                     X-10
<PAGE>

                    who is a Participant may not make any Basic Deposits to his
                    Employee Account for a period of six months following his
                    most recent withdrawal.  If a Participant makes a partial
                    withdrawal during the time he is precluded from making Basic
                    Deposits pursuant to this Article X.C.1.b., the six-month
                    period imposed for any previous withdrawal shall run
                    concurrently with the six-month period following his most
                    recent withdrawal.  This period shall be included in
                    determining the Participant's years of participation under
                    the Plan and shall not be deemed to be a suspension for the
                    purpose of Article IX of the Plan.

                    During the period of suspension provided for in this Article
                    X.C.1.b., a Participant who is making Supplemental Deposits
                    will continue making such deposits until he voluntarily
                    elects to suspend such deposits in accordance with Article
                    IX.B.

               c.   Redeposits and Interests Remaining upon Partial Withdrawals.

                    Upon any withdrawal pursuant to this Article X.C.1.:

                    (1)  A nonvested Member forfeits the matching Company
                         Contributions attributable to the Basic Deposits he
                         withdraws, provided, however, that if a nonvested
                         Member who is a Participant redeposits the total amount
                         of Basic Deposits which he withdrew or the total amount
                         of the withdrawal, valued as of the date of withdrawal,
                         then in such event, Sentinel shall contribute to the
                         Employee Account of the Participant an amount equal to
                         the amount of Company Contributions forfeited under
                         this paragraph.  Only an Employee, who is a
                         Participant, or an employee of an Affiliated Company
                         who has an Employee Account in the Plan is entitled to
                         make such a redeposit and the redeposit must be made no
                         later than the close of the first period of five
                         consecutive One-Year Breaks-in-Service commencing after
                         the withdrawal.

                    (2)  A vested Member shall not lose his interest in or his
                         rights in respect to the balance of his Employee
                         Account.

          2.   Applicable to A Member's Before Tax Account

               a.   Eligibility to Make Withdrawal

                    A Member, if not employed by Sentinel, by written direction
                    to the Trustee in the manner prescribed by the Benefit
                    Board, shall be entitled to make a partial withdrawal from
                    his Before Tax Account upon his retirement or upon
                    separation from service. A Participant, by direction to the
                    Trustee, in the manner prescribed by the Benefit Board,
                    shall be entitled to make a partial withdrawal from his
                    Before Tax Account upon attaining the age of 59 1/2 (subject
                    to procedures implemented by the Benefit Board to implement
                    Code Section 72(e)(8)(1)) or upon proof of Hardship. A
                    Participant may not make a Hardship withdrawal except

                                     X-11
<PAGE>

                    by prior approval of the Benefit Board or its delegee,
                    unless the Participant certifies that the need for the
                    withdrawal is a result of medical expense, college education
                    expense, or the purchase of a principal residence for the
                    Participant or his dependent. The amount of a partial
                    Hardship withdrawal will be limited to the amount of
                    immediate financial need demonstrated by the Participant to
                    the Benefit Board, or its delagee.

                                     X-12
<PAGE>

               b.   Conditions of Partial Withdrawal of Before Tax Account.

                    (1)  A Participant shall not be granted a withdrawal under
                         Article X.C.2 unless he proves he has attained age 59
                         1/2 or that he meets the definition of Hardship set
                         forth in Article II.W.  The Benefit Board or its
                         delegee will determine whether the definition of
                         Hardship has been met.

                    (2)  A nonvested Member forfeits the matching Company
                         Contributions attributable to the Basic Deposits he
                         withdraws from his Before Tax Account, unless such
                         nonvested Member is a Participant who subsequently
                         redeposits the total amount of such withdrawal to his
                         Regular Account pursuant to Article X.B.2.d(2) and
                         subsequently vests in such Company Contributions.  The
                         amount of Basic Deposits that may be withdrawn by a
                         nonvested Member will be reduced by the amount of
                         Company Contributions which must remain in the Member's
                         Regular Account to insure that he would receive the
                         amounts to which he would be entitled if he were making
                         a full withdrawal of his Employee Account.

                    (3)  A Member who makes a partial withdrawal from his Before
                         Tax Account shall make such withdrawals of Basic
                         Deposits and Earnings in his Before Tax Account in the
                         same order and under the same terms and conditions
                         relating to suspension from participation in the Plan
                         and frequency of withdrawals as would apply to his
                         Regular Account pursuant to Article X.C.1. but subject
                         to the limitations on withdrawal of this Article
                         X.C.2., except that if such withdrawal shall be by a
                         Participant for reason of Hardship it shall not be
                         counted as one of the three partial withdrawals
                         allowable during a calendar year.

          3.   If, at any time pursuant to the provisions of Article X.C., a
               Member withdraws the entire amount credited to his Employee
               Account, he shall be deemed to have made a full withdrawal
               pursuant to Article X.B.

     D.   Separation from service during or after the year in which a
          Participant attains age 55 shall be considered to be on account of
          early retirement under this Plan solely for the purpose of enabling
          the Member to qualify for an exemption under Section 72(t)(2)(A)(v) of
          the Internal Revenue Code.

     E.   Compliance with Minimum Distribution Rules

          1.   General Rule

               Notwithstanding any other provision of this Plan, a Member,
               Beneficiary, Terminated Member, Retired Member, or Alternate
               Payee shall receive Minimum Distributions. "Minimum
               Distributions" shall mean distributions in such amounts as are
               required to satisfy section 401(a)(9) of the Code, the incidental
               death benefit rule of section 401(a)(9)(G) of the Code, and
               regulations under both of those Code sections, and which are made
               no later than required to satisfy section 401(a)(9) of the Code
               and regulations thereunder. Except as

                                     X-13
<PAGE>

               provided in Article X.E.2., 3. and 4. below, a Member,
               Beneficiary, Terminated Member, Retired Member, or Alternate
               Payee shall receive his Minimum Distributions on or before his
               Required Beginning Date in the form of a lump sum payment of his
               entire Vested Account. In the case of a Member, Terminated Member
               or Retired Member, the Required Beginning Date is April 1 of the
               year following the year in which such individual turned age 70
               1/2. In the case of a Beneficiary or Alternate Payee, the
               Required Beginning Date is December 31 of the year in which the
               Member to whom the benefit relates turns or would have turned age
               70 1/2.

          2.   Active Employees

               If a Member has not terminated employment with Sentinel on April
               1 of the calendar year following the calendar year in which he
               attained age 70 1/2, his Minimum Distribution will begin no later
               than that date in the form of a Lifetime Periodic Payment, Joint
               Life Periodic Payment, or Variable Periodic Payment calculated on
               the actuarial life of the Member.

          3.   Retired Members

               If a Retired Member makes an election under Article X.A.3. of the
               Plan to receive a Periodic Payment Option and the payments begin
               before his Required Beginning Date, the payments will be adjusted
               no later than his Required Beginning Date, as necessary, to
               ensure that the Retired Member receives Minimum Distributions. If
               the Retired Member has made such an election but the payments do
               not begin before his Required Beginning Date, Minimum
               Distributions will begin no later than that date, in the form
               elected by the Retired Member, adjusted as necessary to ensure
               that the Retired Member receives Minimum Distributions. If a
               Retired Member, who has made an election under Article X.A.2. has
               not withdrawn his entire Employee Account or made an election
               pursuant to Article X.A.3., Minimum Distributions will begin no
               later than his Required Beginning Date in the form of a Lifetime
               Periodic Payment calculated on the actuarial life of the Retired
               Member, adjusted as necessary to ensure that the Retired Member
               receives Minimum Distributions.

          4.   Spouse Beneficiaries

               Payments to a spouse beneficiary must be made according to the
               following rules.

               a.   If the Member died before his Required Beginning Date,
                    payments to the spouse beneficiary must begin no later than
                    the Beneficiary's Required Beginning Date and must be over
                    the life expectancy of the spouse beneficiary, or a period
                    certain which is no longer than that life expectancy (or 5
                    years if that is greater than the life expectancy).

               b.   If the Member died on or after his Required Beginning Date,
                    payments to the spouse beneficiary must begin immediately
                    and must be made at least as rapidly as the method in effect
                    at the Member's death.

                                     X-14
<PAGE>

     F.   Waiver of Notice

          Notwithstanding any other provision of the Plan:

          If a distribution is one to which sections 401(a)(11) and 417 of the
          Internal Revenue Code do not apply, such distribution may commence
          less than 30 days after the notice required under section 1.411(a)-
          11(c) of the Income Tax regulations is given, provided that:

          (1)  the Plan Administrator clearly informs the Participant that the
               Participant has a right to a period of a least 30 days after
               receiving the notice to consider the decision of whether or not
               to elect a distribution (and, if applicable, a particular
               distribution option), and

          (2)  the Participant, after receiving the notice affirmatively elects
               a distribution.

          The term "Participant" as used in this Article X. F. shall have the
          same meaning as used in Revenue Procedure 93-47, as released on
          November 30, 1993, and not the meaning set forth in Article II. HH.

     G.   Twenty Percent Withholding

          Any distribution made under this Article X. and any "Deemed
          Withdrawal" under Article XI. that is an Eligible Rollover
          Distribution within the meaning of Article XXIII. B. 2. a. and which a
          Member does not elect to have paid directly to an Eligible Retirement
          Plan specified by the Distributee in the form of a Direct Rollover
          shall be subject to the 20 percent withholding specified in Code
          section 3405.

                                     X-15
<PAGE>

XI.  LOANS
     -----

     A.   Eligibility for a Loan

          1.   The Loan Administrator (as provided for in Article XI.K.1. may
               grant a loan to any Plan Member who at the time of loan closure
               is eligible to make Basic Deposits pursuant to Article IV., or
               who would be eligible to make Basic Deposits but for the
               suspension provisions of Articles IX.B. or X.C. and to any Plan
               Member with an Employee Account who is a participant of the
               Thrift Plan for Employees of Conoco, Inc. (the "Investment Plan")
               entitled to make Basic Deposits under Article IV. of the
               Investment Plan, or who would be eligible to make Basic Deposits,
               but for the Suspension provisions of Articles IX.B., X.B. or X.C.
               of the Investment Plan.  The Loan Administrator may also grant a
               loan to any "party-in-interest" (as defined in 29 U.S.C.
               (S)1002(14)) with an Employee Account or to any person who has a
               vested Employee Account under the Plan and who is employed by a
               Corporate Affiliate.  A loan may not be granted to those Members
               eligible to make Basic Deposits pursuant to Article IX.A.3. or
               who have their Employee Accounts collaterally pledged pursuant to
               Article XVI.B.  For the purpose of this Article XI., a person to
               whom a loan is granted shall be referred to as a "Borrowing
               Participant."  For the purpose of this Article XI., Corporate
               Affiliate shall mean a corporation that has adopted the Plan or
               any other profit sharing plan and is a member of the controlled
               group of corporations (within the meaning of Section 1563(a) of
               the Internal Revenue Code, determined without regard to Section
               1563(a)(4) and Section 1563(3)(3)(C)) of which DuPont is parent,
               and any corporation which is not a member of said controlled
               group of corporations but has adopted any profit sharing plan
               administered by a plan administrator appointed by any member of
               said controlled group.

          2.   The Loan Administrator may grant up to five loans, but never more
               than one loan on any day, from such Borrowing Participant's
               vested Employee Account, provided, however, that no loans may be
               granted on the basis of a Borrowing Participant's Employee
               Account to which he has not contributed Basic Deposits, and may
               direct the Trustee to disburse trust funds to such Borrowing
               Participant, provided that such loans are available to all
               persons described in Article XI.A.1. on a reasonably equivalent
               basis and the terms and conditions of such loans comply with this
               Article XI. and such other terms and conditions as the Benefit
               Board may from time to time prescribe.

          3.   Application for a loan shall be in the manner prescribed by the
               Benefit Board.  Each loan shall be evidenced by a promissory note
               which shall set forth the principal amount of the loan, the rate
               of interest, the repayment schedule, identification of any
               security interest or collateral, and such other items as may be
               determined by the Benefit Board.

          4.   Notwithstanding anything to the contrary, a loan shall not be
               granted if it would adversely affect either the status of the
               Plan as one which qualifies as a profit sharing plan pursuant to
               Section 401 of the Internal Revenue Code of 1986, as amended, or
               which would adversely affect the trust maintained pursuant to
               Article XIV.A. as a trust which is exempt from

                                     XI-1
<PAGE>

               Federal Income Tax pursuant to Section 501 of the Internal
               Revenue Code of 1986, as amended.

     B.   Obtaining Funds For a Loan

          Upon approval of the Loan Administrator of the loan application, such
          Borrowing Participant shall direct the Trustee to sell, turn in for
          redemption, or liquidate, as may be appropriate, any investments in
          his Employee Account under any one or more of Options A., B., C., or
          D. as is necessary to make funds available for the loan granted to
          such Borrowing Participant and direct the Trustee to disburse such
          funds to the Borrowing Participant, provided such loan shall not be
          prohibited by any law including, but not limited to, Section 4975 of
          the Code of 1986, as amended, or Section 406 of the Employee
          Retirement Income Security Act, as amended.

          1.   Such sale, redemption, or liquidation shall be by Fund Transfer
               Order or such other direction or form as prescribed by the
               Benefit Board, however, to the extent the funds are available for
               the loan amount in a Borrowing Participant's Regular Account,
               such sale will be made from any one or more of Options A., B.,
               C., or D. of said Regular Account.

          2.   Any funds disbursed as a loan to a Borrowing Participant shall be
               deemed invested in Option E. (Loan Account).

     C.   Maximum Amount of Loan

          The amount of any loan from the Plan, determined by aggregating the
          outstanding balances of loans from the Plan and loans from profit
          sharing plans adopted by any Corporate Affiliate, shall not be less
          than $1,000.00 nor greater than the lesser of (i) $50,000.00 reduced
          by the excess, if any, of (1) the highest outstanding balance of loans
          from the Plan during the one-year period ending on the day before the
          date on which such loan was made over (2) the outstanding balance of
          loans from the Plan on the date on which such loan was made; or (ii)
          50 percent of the vested portion of the Borrowing Participant's
          Employee Account. The value of the Borrowing Participant's Employee
          Account for the purpose of this Article XI.C. shall be determined by
          the Loan Administrator from the most recent valuation information that
          is available at the time of receipt of the loan application, as
          adjusted by any contributions or withdrawals made after receipt of the
          loan application and prior to loan closure, subject to the following
          additional provisions:

          1.   Solely for the purpose of determining whether the amount of any
               loan made under the Plan as adopted by any corporation which is a
               member of the controlled group of corporations (within the
               meaning of Section 1563(a) of the Internal Revenue Code,
               determined without regard to Section 1563(a)(4) and Section
               1563(e)(3)(C)) of which DuPont is parent, exceeds 50 percent of
               the value of the vested portion of the Borrowing Participant's
               Employee Account, the Loan Administrator shall include the vested
               portion of the Borrowing Participant's Employee Account in the
               Plan, and the DuPont Savings and Investment Plan, exclusive of
               the Borrowing Participant's Employee Account in the Plan, the
               Investment Plan for Salaried Employees of CONSOL Inc. and the
               DuPont Savings and Investment Plan as such plans have been
               adopted by corporations which are not members of said controlled
               group of corporations.

                                     XI-2
<PAGE>

          2.   The maximum amount of any loan shall in no event exceed 50
               percent of the vested portion of the Borrowing Participant's
               Employee Account, exclusive of any Employee Account established
               pursuant to a QDRO or to which the Borrowing Participant is
               entitled as a beneficiary under Article XII., as determined from
               the most recent valuation information that is available at the
               time of loan closure.  For purposes of the preceding sentence,
               when loans are made simultaneously to a Borrowing Participant
               under the Plan, as adopted by Corporate Affiliates which are
               members of the control group and as adopted by members which are
               not members of the controlled group (within the meaning of
               Section 1563(a) of the Internal Revenue Code, determined without
               regard to Section 1563(a)(4) and Section 1563(e)(3)(C)), no such
               loan shall be considered to exceed 50 percent of value of the
               vested portion of the Borrowing Participant's Employee Account if
               the aggregate amount of said loans does not exceed 50 percent of
               the sum of the Borrowing Participant's Employee Accounts under
               the Plan, as adopted by said corporations.

     D.   Loan Payment Period

          The period of any loan shall be as requested by the Borrowing
          Participant and as agreed to by the Loan Administrator, provided that
          the minimum period of any loan shall be 12 months, with additional
          monthly increments, through a maximum loan period of 60 months,
          provided, however, that such maximum loan period may be greater than
          60 months and not more than 120 months for a loan granted to a
          Borrowing Participant who has furnished evidence satisfactory to the
          Benefit Board that the loan will be used to acquire any dwelling unit
          which, within a reasonable time, is to be used (determined at the time
          the loan is made) as the principal residence of the Participant.

     E.   Rate of Interest

          1.   The rate of interest that shall be charged for a loan granted
               pursuant to Article XI. shall be determined on the last work day
               of the calendar month preceding the receipt of the loan
               application, or any other date as designated from time to time by
               the Benefit Board, and shall be the average rate for secured
               personal loans (rounded to the next lower one-quarter percent)
               than in effect at a group of financial institutions, as
               designated from time to time by the Benefit Board, provided,
               however, that the interest rate shall not exceed the maximum
               amount allowed by law.

          2.   The rate of interest, with respect to any loan, shall be constant
               throughout the term of the loan and shall not exceed the rate of
               interest permitted under applicable law.  Each Borrowing
               Participant shall receive from the Loan Administrator, at the
               time of loan closure, a statement regarding the amount of the
               loan, the annual percentage rate, the amount of interest, and
               total repayment schedule of the loan, and any additional
               information required by applicable law.

     F.   Frequency of Loans

          A loan shall not be granted more frequently than once during any 24-
          consecutive-hour period.

                                     XI-3
<PAGE>

     G.   Method of Loan Repayment

          Unless otherwise provided in this Article XI., repayment of the
          outstanding principal and accrued interest on any loan shall be
          accomplished through the deduction of equal amounts (or nearly equal
          amounts) from the monthly Compensation of the Borrowing Participant
          during the term of the loan. The repayment amount representing
          principal shall be credited first to a Borrowing Participant's Before
          Tax Account until or unless the loan account balance of such Before
          Tax Account is equal to zero. The repayment amount representing
          interest shall be credited to earnings in the Borrowing Participant's
          Regular or Before Tax Account as applicable. The loan repayment
          amounts shall be invested pursuant to the Borrowing Participant's
          current Investment Direction as provided for in Article VII. If the
          monthly Compensation of a Borrowing Participant is not sufficient to
          obtain or the Borrowing Participant does not authorize the scheduled
          principal and interest payment which becomes due and payable ("Loan
          Payment"), unless the Loan Payment or interest payment is being made
          by direct remittance as provided for in Article XI.H., a default will
          be declared pursuant to Article XI.J.1.

     H.   Exceptions to Normal Method of Repayment

          1.   A Borrowing Participant who is on an authorized leave of absence
               or an absence due to layoff or strike and is not paid his
               Compensation nor entitled to such Compensation because of such
               absence shall be permitted for a period not to exceed 12
               consecutive months, to remit directly to the Loan Administrator
               the amount of any scheduled Loan Payment.  The payment of less
               than the scheduled Loan Payment will be declared a default
               pursuant to Article XI.J.1.  If, at the conclusion of a 12-
               consecutive-month period of absence, the Borrowing Participant
               has not returned, the amount of the Loan Account shall be
               canceled pursuant to Article XI.J.3.

          2.   If it is determined by the Loan Administrator that the procedure
               of payroll deduction as a method of Loan Payment is not feasible
               with respect to a Borrowing Participant, such Borrowing
               Participant shall remit directly to the Loan Administrator the
               amount of any scheduled Loan Payment.  The payment of less than
               the scheduled Loan Payment will be declared a default pursuant to
               Article XI.J.1.

          3.   Notwithstanding a declaration of a default pursuant to Article
               XI.J.1., due to a Borrowing Participant's termination of
               employment, a Borrowing Participant who has elected early,
               normal, or incapacity retirement and has elected to defer
               withdrawal of his Employee Account pursuant to Article X.A.2.
               may, for such period of deferral, remit directly to the Loan
               Administrator the amount of any scheduled Loan Payment.  The
               payment of less than the scheduled Loan Payment will be declared
               a default pursuant to Article XI.J.1.

          4.   In the event that any Borrowing Participant fails to make direct
               remittance as provided under this Article XI.H. of any scheduled
               principal and interest payment under Article XI.H.1., 2, and 3 by
               the 45th day after such payment is due, a default will be
               declared pursuant to Article XI.J.1.

          5.   Notwithstanding anything to the contrary, no provision of this
               Article XI.H. shall extend the approved term of the loan.

                                     XI-4
<PAGE>

     I.   Prepayment of Loan Balance

          Notwithstanding any other provisions of this Article XI., a Borrowing
          Participant shall retain the right to repay, at any time prior to the
          end of the loan period, without penalty, the full amount of any loan
          granted pursuant to this Article XI. Such payment shall be made in
          cash, a certified or cashier's check, or such other form of guaranteed
          payment as permitted by the Loan Administrator, or by an election on
          the part of the Borrowing Participant to incur a Deemed Withdrawal
          from such Borrowing Participant's Employee Account pursuant to the
          terms of Article XI.J.4.

     J.   Loan Defaults

          1.   While any portion of a loan in a Member's Employee Account is
               outstanding, a default will be declared as described in Article
               XI.G., XI.H.1, 2, 3, or 4, or upon the termination of employment
               of any Borrowing Participant, who is not eligible for Early or
               Normal retirement under the Retirement Plan and has elected to
               defer distribution of his Employee Account, such termination
               including, but not limited to, retirement, death, disability, or
               resignation but excluding any transfer of employment to any
               Corporate Affiliate and any transfer of employment as stated in
               Article X.B.4. (Declaration of Default).  Except as provided in
               Article XI.J.3., a notice (Notice of Default) will be issued upon
               a Declaration of Default.

          2.   In the event of the termination of employment of a Borrowing
               Participant, who is not eligible for Early or Normal retirement
               under the Retirement Plan or who is eligible, but has not elected
               to defer distribution of his Employee Account, a Declaration of
               Default shall occur upon the later of the effective date of such
               Borrowing Participant's termination of employment or the first
               day immediately following the month in which the last Loan
               Payment was received from such Borrowing Participant.

          3.   A Deemed Withdrawal pursuant to Article XI.J.4. will be made from
               the Borrowing Participant's Employee Account without the issuance
               of a Notice of Default at the end of any direct remittance period
               provided in Article XI.H.1 or 3.  A Deemed Withdrawal will be
               made for loans granted prior to January 1, 1993, upon the third
               occurrence of a Declaration of Default with respect to the loan
               for which the Declaration of Default was issued, and for loans
               granted after December 31, 1992, upon the occurrence of a
               Declaration of Default with respect to the loan for which the
               Declaration of Default was issued, for the Loan Balance of a loan
               granted pursuant to this Article XI. if all Loan Payments are not
               made prior to 45 days after the first Loan Payment was not made
               by the Borrowing Participant.

          4.   If the Loan Administrator does not receive payment of any unpaid
               scheduled Loan Payment or payments due pursuant to Article
               XI.H.4. within 30 days of the issuance of a Notice of Default,
               the Loan Account and accrued interest (Loan Balance) shall be
               deemed withdrawn (Deemed Withdrawal) as follows:

               a.   If the Loan Account is in a Member's Regular Account only, a
                    Deemed Withdrawal shall be made from the

                                     XI-5
<PAGE>

                    Borrowing Participant's Regular Account for the amount of
                    the Loan Balance.

               b.   If the Loan Account is in a Member's Before Tax Account and
                    the Borrowing Participant is not age 59 1/2 or over, a
                    Deemed Withdrawal shall be made consistent with the
                    provisions of Article XI.J.4.d.

               c.   If the Loan Account is in a Member's Before Tax Account and
                    the Borrowing Participant is eligible to make a withdrawal
                    from such account, then a Deemed Withdrawal shall be made
                    from the Borrowing Participant's Before Tax Account unless
                    the Member elects otherwise.

               d.   Notwithstanding the preceding, no Deemed Withdrawal shall
                    occur if such withdrawal would adversely affect the status
                    of the Plan under Section 401(a) or 401(k) of the Code of
                    1954, as amended.  In that event, the Plan Administrator may
                    take such other action as it deems necessary to ensure
                    repayment of loans made under this Article and in compliance
                    with applicable law.  If a Deemed Withdrawal under Article
                    XI.J.4. would adversely affect the status of the Plan under
                    Section 401(a) or 401(k) of the Code:

                    1.   The Member's entire Regular Account shall be
                         distributed to the Member, subject to Article X.B.2.a.
                         and b. in accordance with the previously given consent
                         of the Member.

                    2.   If the Member is a Participant in the Plan, he shall be
                         suspended from making Supplemental Deposits  during the
                         period beginning 45 days from the date the first
                         payment is missed and ending with the last day of the
                         month in which all Past Due Loan Payments are made; and

                    3.   If the Member is a Participant in the Plan, he shall be
                         suspended from making Basic Deposits and from receiving
                         Company Contributions during the period beginning 45
                         days from the date the first payment is missed and
                         ending with the last day of the month in which all the
                         Past Due Loan Payments are made or the expiration of
                         six months whichever is later.

                    4.   The amount of any Deemed Withdrawal shall be considered
                         to have been distributed from the Borrowing
                         Participant's Employee Account pursuant to the sequence
                         of withdrawals specified in Article X.C. and shall be
                         subject to the suspensions thereof, but such Deemed
                         Withdrawal will not be considered as one of the three
                         partial withdrawals allowable in a calendar year.

                    5.   A Deemed Withdrawal may be initiated by the:

                         a.   Borrowing Participant upon a voluntary election to
                              cancel the Loan Account, or

                         b.   Loan Administrator pursuant to conditions
                              described in this Article XI.J.

                                     XI-6
<PAGE>

     K.   Loan Administrator's Authority/Responsibility

          1.   Subject to the direction of the Board, the Benefit Board shall
               have overall responsibility for the administration and operation
               of the loan procedure under this Article XI., which
               responsibility it shall in part discharge by the appointment of a
               Loan Administrator.

          2.   The Loan Administrator shall be one or more persons appointed by
               the Benefit Board.  In the absence of such appointment, the
               Benefit Board shall be the Loan Administrator.

                                     XI-7
<PAGE>

               Each person serving as the Loan Administrator shall remain in
               office at the will of the Benefit Board, and the Benefit Board
               may from time to time remove any person serving as the Loan
               Administrator with or without cause and shall appoint his
               successor. The Loan Administrator shall have the general
               responsibility for the administration of loans to Borrowing
               Participants under the Plan.

          3.   Each person, upon being appointed Loan Administrator, shall file
               an acceptance thereof in writing with the Benefit Board.  Any
               person serving as Loan Administrator may resign by delivering his
               written resignation to the Benefit Board, and such resignation
               shall become effective upon the date specified therein.  In the
               event more than one person is serving as Loan Administrator, the
               remaining persons serving as Loan Administrator shall constitute
               the Loan Administrator with full power to act until said vacancy
               is filled.

          4.   The Loan Administrator shall administer loans to Borrowing
               Participants in accordance with the terms of the Plan and shall
               have all powers necessary to accomplish that purpose, including,
               but not limited to, the following:

               a.   To process, approve, or disapprove applications for loans to
                    Borrowing Participants, based upon objective criteria
                    applied consistently;

               b.   To decide all questions arising in the administration of
                    loans, including those relating to eligibility for a loan,
                    the terms and conditions for such loan, and the repayment of
                    such loan;

               c.   The authorize the Trustee to make payment of funds to the
                    Borrowing Participant.  Further, to submit to the Trustee
                    amounts received in repayment of principal and interest and
                    advise the Trustee of the Plan options such funds are to be
                    invested in;

               d.   To execute on behalf of the Benefit Board, as creditor, any
                    note, security agreement, or other evidence of credit or
                    security arrangement created pursuant to the provisions of
                    this Article;

               e.   To communicate to Participants any changes regarding the
                    terms and conditions upon which a loan shall be granted,
                    including the applicable rate of interest charged with
                    respect to a loan, and the effective date with respect to
                    any such changes.

          5.   The Loan Administrator shall have authority to delegate, from
               time to time, all or any part of its responsibilities under the
               Plan to such person or persons as it may deem advisable and in
               the same manner revoke any such delegation of responsibility.
               Any action of the delegate shall have the same force and effect
               for all persons hereunder as if such action had been taken by the
               Loan Administrator.

     L.   Suspension of Loans

          The Benefit Board may from time to time suspend the granting of loans
          under the Plan for such purposes as the Benefit Board may determine,
          including, but not limited to, the proper discharge of its fiduciary
          duties under law.

                                     XI-8
<PAGE>

XII.  BENEFICIARIES, TERMINATED EMPLOYEES, AND ALTERNATE PAYEES
      ---------------------------------------------------------

      A.  Beneficiary Designation

          Any Member, except an Alternate Payee or a Non-spouse Beneficiary, may
          file with the Trustee a written designation, in the form prescribed by
          the Benefit Board, of the beneficiary or beneficiaries to receive all
          or part of his Employee Account upon his death. If however, a Member
          is married, such Member may not designate anyone other than his spouse
          as beneficiary under the Plan, unless the Member's spouse consents in
          writing (such consent being duly notarized) to the designation of any
          other beneficiary. A Member who is single, or a married Member with
          spousal consent may from time to time change or cancel the existing
          beneficiary designation. The last such designation received by the
          Trustee shall be controlling over any testamentary or other
          disposition; provided, however, that no designation, or change or
          cancellation thereof, under this Plan shall be effective unless
          received by the Trustee prior to the Member's death, and in no event
          shall it be effective as of a date prior to such receipt.

          Notwithstanding the preceding sentence, if a beneficiary or
          beneficiaries disclaims Plan assets to which he is entitled as a
          properly designated beneficiary under this Article XII.A., the
          benefits will be paid to the contingent beneficiary or beneficiaries
          designated by the deceased Member. If there is no properly designated
          contingent beneficiary or the contingent beneficiary disclaims the
          Plan assets to which he is entitled as a properly designated
          beneficiary under this Article XII.A., then the deceased Member's
          Employee Account shall be paid as set forth in Article XII.B., below.
          Any such disclaimer shall be:

          1.   a qualified disclaimer, as defined in the Internal Revenue Code
               Section 2518, and

          2.   received by the Plan no later than 9 months after the death of
               the Employee.

     B.   Payment to Beneficiary(s)

          1.   Upon the death of a Member, his entire Employee Account shall be
               paid or distributed in lump sum to his spouse, if any, unless his
               spouse has consented to the designation of a beneficiary or
               beneficiaries, as set forth in Article XII.A above, then to the
               beneficiary or beneficiaries designated by him as provided in
               Article XII.A. or, in the absence of such designation to the
               beneficiary or beneficiaries entitled thereto under his last will
               and testament; or, in the absence of such will and testament, to
               the beneficiary or beneficiaries entitled thereto under the
               intestacy laws governing the disposition of his estate.  If the
               Trustee shall be in doubt as to the right of any beneficiary, the
               Trustee may pay the amount in question to the estate of the
               deceased Member, in which event the Trustee, Sentinel, and the
               Benefit Board shall not be under any further liability to anyone.

          2.   Payment to beneficiaries shall be in accordance with the
               following rules:

               a.   If the beneficiary is the surviving spouse of a person who
                    died while employed by the Company or by an Affiliated
                    Company or the surviving spouse of a person

                                    XII-1
<PAGE>

                    who retired under the Early, Normal, or Incapacity
                    retirement provisions of the Retirement Plan, at a time when
                    he was employed by the Company or by an Affiliated Company,
                    said beneficiary:

                    (1)  shall have the rights set out in Article X.A of the
                         Plan (deferral, Periodic Payment Options and
                         withdrawals), to the extent such rights are consistent
                         with Section 401(a)(9) of the Code, as if he were a
                         Member eligible for early, normal, or incapacity
                         retirement;

                    (2)  shall have the rights set out in Articles VII.
                         (Investments) and VIII. (Charges and Credits) of the
                         Plan as if he were a Participant in the Plan, and

                    (3)  must, if the beneficiary defers distribution, either
                         elect to begin receiving a Periodic Payment Option or
                         withdraw the entire Employee Account to which he is
                         entitled by the end of the year during which the
                         deceased Member from whom the Spouse Beneficiary Member
                         received his Employee Account, would have reached age
                         70 1/2.

               b.   If the beneficiary is a person not described in Article
                    XII.B.2.a. above or is a trust or other entity, a lump sum
                    payment of the account to which the beneficiary is entitled
                    shall be made upon the election of the beneficiary but no
                    later than 12 months following the death which caused the
                    designated beneficiary to be entitled to the Employee
                    Account.

     C.   Payment to Terminated Employees (Terminated Members)

          Payment to former Employees who terminated employment with Sentinel
          other than by Normal, Early or Incapacity Retirement under the
          Retirement Plan shall be according to the provisions of Articles

     D.   Qualified Domestic Relations Order

          The Plan will make payment from a Member's, Terminated Member's or
          Retired Member's Regular and/or Before-Tax Account as required by a
          qualified domestic relations order, as defined under section 414(p) of
          the Code. Any amounts awarded to an Alternate Payee, prior to the
          death of the Member, Terminated Member or Retired Member pursuant to a
          domestic relations order determined by the Plan Administrator to be
          qualified shall be distributed within 90 days of such determination,
          unless the qualified domestic relations order specifies that the
          Alternate Payee shall have an account in the Plan. No Loan,
          Withdrawal, or other action otherwise permissible pursuant to any
          provision of the Plan shall be taken which, in the opinion of the Plan
          Administrator, may be inconsistent with the provisions of a qualified
          domestic relations order.

     E.   Sale of Business or Facility

          1.   An Employee or former Employee who has an Employee Account and
               whose employment with Sentinel or an Affiliated Company is to be
               terminated in connection with the sale by Sentinel

                                     XII-2
<PAGE>

               or an Affiliated Company of any business or facility (such
               Employee or former Employee is hereinafter referred to as "Sale-
               Terminee") may, at any time prior to termination of employment,
               make an irrevocable election to have the balance of his Employee
               Account paid directly to the trustee of a qualified defined
               contribution plan maintained by the purchaser of the business or
               facility, if such plan will accept the transfer of assets. If he
               so elects, the following provisions will apply, notwithstanding
               anything else to the contrary in the Plan.

               a.   On or after the valuation date occurring as soon as is
                    practicable pursuant to procedures established by the
                    Benefit Board, after termination of the Sale-Terminee's
                    employment with Sentinel or an Affiliated Company, the
                    balance of his Employee Account shall, upon approval by the
                    Benefit Board, be allocated to the Fixed Income Account.

               b.   If the receiving plan will permit transfer of loans and the
                    purchaser of the business or facility agrees to make
                    deductions from monthly compensation of the Sale-Terminee
                    for loan payments, the Sale-Terminee's termination of
                    employment with Sentinel or an Affiliated Company shall not
                    cause a Declaration of Default to occur. Except as provided
                    in this paragraph b., the provisions of Section XI.J., "Loan
                    Default", will apply to such loan prior to its transfer to
                    the receiving plan and for the purpose of applying Section
                    XI.J., termination of employment or retirement from the
                    purchaser of the business or facility shall be considered a
                    termination of employment or retirement from Sentinel.

               c.   Payment to the trustee of the receiving plan will be made
                    after Sentinel receives satisfactory proof that the
                    requirements of Section 414(l) of the Code will be satisfied
                    in the transfer of assets. Payment will be based on the
                    value of the Employee Account as of the valuation date
                    occurring after Sentinel receives such proof, pursuant to
                    procedures established by the Benefit Board, and will be
                    made in cash and/or promissory notes.

               d.   When the Sale-Terminee's Employee Account is transferred to
                    the trustee of the receiving plan, the entire Employee
                    Account shall be transferred whether or not the Sale-
                    Terminee was entitled to withdraw his entire Employee
                    Account at the time of termination of employment with
                    Sentinel or an Affiliated Company.

               e.   After the Sale-Terminee has elected to transfer his Employee
                    Account and has terminated employment with Sentinel or an
                    Affiliated Company and prior to the transfer of his Employee
                    Account to the receiving plan the following rules shall
                    apply:

                    (1)  The Sale-Terminee may not make partial withdrawals or
                         loans or sell or purchase assets but may make a full
                         withdrawal. Payment of a full withdrawal shall be made
                         in cash as of the valuation date applicable to
                         withdrawal requests. If a Sale-Terminee makes such a
                         full

                                     XII-3
<PAGE>

                         withdrawal, paragraph d. of this Section XII.E. shall
                         not apply and he may withdraw his entire Employee
                         Account.

                    (2)  If the Sale-Terminee terminates employment with the
                         purchaser of the business or facility, he or his
                         beneficiary will be entitled to his entire Employee
                         Account.

          2.   If the Sale-Terminee does not make the election described above
               in Article XII.E.1., he or his beneficiary will be entitled to
               his entire Employee Account following his termination with
               Sentinel or an Affiliated Company solely for the reason of a sale
               of any business or facility.

          3.   If prior to his scheduled termination of employment with Sentinel
               or an Affiliated Company in connection with the sale of a
               business or facility the Sale-Terminee terminates employment for
               any reason other than death or disability, Article XII.E.1. and
               2. shall not apply and the Sale-Terminee election to transfer
               assets shall be void.

                                     XII-4
<PAGE>

XIII.  AFFILIATED COMPANIES
       --------------------

     A.   Affiliated Company Participation

          Any corporation which is an Affiliated Company of Sentinel and the
          employees of which are admitted to membership in the Retirement Plan
          and have satisfied the eligibility requirements of Article III. may
          participate in this Plan upon the following conditions:

          1.   Such Affiliated Company shall make, execute, and deliver such
               instruments as Sentinel and the Trustee shall deem necessary or
               desirable.

          2.   Such Affiliated Company shall appoint Sentinel as its agent to
               act for it in all transactions in which Sentinel believes such
               agency will facilitate administration of the Plan; and the
               Benefit Board shall act with respect to such Affiliated Company
               and its employees as well as with respect to Sentinel and its
               employees.

          3.   Any Affiliated Company may, by action of its board of directors,
               withdraw from participation upon notice to Sentinel and the
               Trustee, and such withdrawal shall automatically effect the
               termination and liquidation of the Plan insofar as it relates to
               such withdrawing Affiliated Company and its employees.

          4.   No modification of the Plan shall be effective in respect of any
               Affiliated Company and its employees unless agreed to in writing
               by such Affiliated Company in a form satisfactory to Sentinel. If
               any such modification shall not be so agreed by such Affiliated
               Company within 90 days, it shall be deemed to have elected to
               withdraw from participation in the Plan with the effect provided
               in Article XIII.A.3.

     B.   Affiliated Company Authority

          It is the intent of this Article XIII. that the authority of each
          Affiliated Company to act independently and in accordance with its own
          best judgment shall not be prejudiced or diminished and at the same
          time that the several Affiliated Companies may act collectively in
          respect to the Trustee, the Benefit Board, and general administration
          in order to secure administrative economics and maximum uniformity.

                                    XIII-1
<PAGE>

XIV. ADMINISTRATION
     --------------

     A.   Trustee

          Sentinel and Merrill Lynch Trust Company of America, a New Jersey
          Corporation, have entered into a Trust Agreement pursuant to which
          said trust company is to act as Trustee under the Plan. Sentinel may,
          without further reference to or action by a Member, an Employee or any
          affiliate of Sentinel participating in the Plan:

          1.   from time to time enter into such further agreements with the
               Trustee or other parties and make such amendments to said Trust
               Agreement or such further agreements, as Sentinel Sentinel may
               deem necessary or desirable to carry out the Plan;

          2.   from time to time designate successor Trustees which in each case
               shall be a bank or trust company having capital and surplus of
               not less than $10,000,000;

          3.   from time to time take such other steps and execute such other
               instruments as Sentinel may deem necessary or desirable to put
               the Plan into effect or to carry it out. The Board shall
               determine the manner in which Sentinel shall take any such
               action; and

          4.   from time to time by action of its Board of Directors designate
               or appoint such Investment Managers as the Board deems necessary
               to manage and invest any portion or all of the Plan assets and by
               action of an officer of the Company who is a member of the
               Benefit Board remove such Investment Managers.

     B.   Employee Benefit Plans Board

          The Board shall create a committee of at least three members, which
          shall be known as the Employee Benefit Plans Board (Plan
          Administrator). The Board shall from time to time designate the
          members of the Benefit Board, and for each of such members, an
          alternate, who shall have the full power to act due to the absence or
          inability to act of such member. The Benefit Board shall act by a
          majority of its members, and the action of a majority of the Benefit
          Board, with or without a meeting, shall be the action of the Benefit
          Board. No bond or other security shall be required of any member of
          the Benefit Board, or alternate, as such other than as may be required
          by law. The general administration of the Plan and the responsibility
          for carrying out the provisions of the Plan shall be placed in the
          Benefit Board. The Benefit Board is authorized to allocate such of its
          fiduciary responsibilities and to designate persons or groups of
          persons, whether employed by the Company or otherwise, to carry out
          fiduciary responsibilities under the Plan. The Trustee shall be
          subject to the directions of the Benefit Board, and shall comply with
          such directions, except with regard to the custody of the assets, the
          voting with respect to shares held by the Trustee, and the purchase
          and sale or redemption of securities which shall be Trustee
          responsibilities.

     C.   Thrift Plan Regulations

          The Benefit Board may from time to time prescribe regulations for the
          administration of the Plan, provided that such regulations are
          consistent with the provisions hereof. Without limiting the generality
          of the foregoing, the Benefit Board may adopt such

                                     XIV-1
<PAGE>

          regulations with respect to the signature by a Member and/or the
          spouse of a Member to any directions or other papers to be signed by
          Employees and similar matters as the Benefit Board shall determine to
          be necessary or advisable in view of the laws of any state or states.

     D.   Recognition of Agency for A Member

          The Trustee need not recognize the agency of any party for a Member
          unless it shall receive documentary evidence thereof satisfactory to
          it and thereafter from time to time, as the Trustee may determine,
          additional documentary evidence showing the continuance of such
          agency. Until such time as the Trustee shall receive documentary
          evidence satisfactory to it of the cessation or modification of any
          agency, the Trustee shall be entitled to rely upon the continuance of
          such agency and to deal with the agent as if such agent were the
          Member.

     E.   Thrift Plan Audit

          The independent accountants who audit the books and accounts of
          Sentinel shall annually examine the records of Sentinel and the
          Benefit Board in respect of the Plan and, on the basis of such
          examination, make such report to the Trustee as it may request, with
          copies of the report to the Board and the Benefit Board. The records
          of the Trustee and (subject to such report by said independent
          accountant) the records of Sentinel and the Benefit Board shall be
          conclusive in respect of all matters involved in the administration of
          the Plan.

     F.   Reporting to Plan Members

          The Trustee shall, annually in or prior to the month of July of each
          calendar year, mail to each Plan Member a statement as of the end of
          the previous year, in such form as the Trustee shall determine,
          setting forth the Employee Account of such Member based on the fair
          market value of his Employee Account as of that date. Such statement
          shall be deemed to have been accepted as correct unless written notice
          to the contrary is received by the Trustee within 30 days after the
          mailing of such statement to the Member.

     G.   Administrative Liability

          No member of the Benefit Board or alternate and no director, officer,
          or Employee of Sentinel shall be personally liable for any act or
          omission to act in connection with the operation or administration of
          the Plan, except for his own willful misconduct or gross negligence or
          as may otherwise be provided in Section 410 of the Employee Retirement
          Income Security Act of 1974 (ERISA).

     H.   Administrative Expense

          Except as otherwise provided in Articles VI.A.2., VIII.A.2., 3., 4.
          and 5., X.B.2.f., X.B.5. and X.C.1.a.(1) hereof, all costs and
          expenses incurred in administering the Plan, including the expenses of
          the Benefit Board, the fees and expenses of the Trustee, the fees of
          its counsel, and other administrative expenses, shall be ratably
          shared by Sentinel. and its affiliated companies participating in the
          Plan on such basis as shall be mutually agreed upon or, failing such
          agreement, as shall be determined by the Trustee.

     I.   Claims by Members

                                     XIV-2
<PAGE>

          The Benefit Board or its delegee shall review all claims for benefits
          under the Plan which are submitted by a Member in the manner
          prescribed by the Benefit Board, and shall advise such Member in
          writing of any denial or partial denial of benefits based on such
          claims and shall set forth the following:

          1.   Specific reasons for such denial or partial denial;

          2.   Reference to pertinent Plan provisions on which the denial or
               partial denial is based; and

          3.   Describe any additional material or information required for
               claimant to perfect his claim.

          In the event of a denial or partial denial of such claim, the Member
          may request the Benefit Board to review such denial or partial denial,
          provided such review request is submitted to the Benefit Board within
          60 calendar days after notice of the denial or partial denial is
          received by the member. The Benefit Board will render a written
          decision of such review to the Member within 60 calendar days
          following receipt of such review request.

          In carrying out their responsibilities under the Plan, the Board shall
          have full and exclusive discretionary authority to interpret the terms
          of the Plan and to determine all issues concerning eligibility for and
          entitlement to Plan benefits in accordance with the terms of the Plan.

                                     XIV-3
<PAGE>

XV.  NOTICES AND OTHER COMMUNICATIONS
     --------------------------------

     A.   Plan Communication to Members

          All notices, reports, and statements given, made, delivered, or
          transmitted to a Plan Member shall be deemed duly given, made,
          delivered, or transmitted when mailed, by such class of mail as the
          Trustee or the Benefit Board may deem appropriate, with postage
          prepaid and addressed to the Member at the address last appearing on
          the books of the Trustee. A Member may change his address from time to
          time by written notice in the form prescribed by the Benefit Board.

     B.   Member Communications to the Plan

          Written directions, notices, and other communications, from Plan
          Members, to Sentinel, the Trustee, or the Benefit Board shall be
          mailed by first-class mail or delivered to such location as shall be
          specified in regulations or upon the forms or in the manner prescribed
          by the Benefit Board and shall be deemed to have been given when
          received at such location.

     C.   Third Party Communication to the Plan

          Any notice or communication, other than from a Member, intended for
          Sentinel, one of its affiliates participating in the Plan, the
          Trustee, or the Benefit Board, may be delivered to an officer of the
          corporation for whom such notice or communication is intended or to a
          member of the Benefit Board, as the case may be, at the address
          hereinafter specified of the party intended, or may be mailed by
          first-class registered mail, with postage prepaid and addressed to
          such party at such address. Any such notice so mailed will be deemed
          to have been given on the day when received. All such notices and
          communications shall be addressed,

          1.   if intended for Sentinel or the Benefit Board, to:

               Employee Benefit Plans Board
               Sentinel Transportation Company
               Read Building -- Suite 101
               3526 Silverside Lane
               Wilmington, DE 19890

          2.   if intended for an affiliate of Sentinel participating in the
               Plan, to the principal place of business of such affiliate, or;

          3.   if intended for the Trustee, to:

               Merrill Lynch Trust Company of America
               33 West Monroe Street
               Suite 2550
               Chicago, Illinois 60603

                                     XV-1
<PAGE>

               Sentinel, its affiliates participating in the Plan, the Trustee,
               or the Benefit Board may change the address to which notices and
               other communications intended for it shall be addressed by
               written notice of such change to the Trustee, in which event the
               Trustee shall advise all parties concerned of the change in such
               manner as the Trustee may deem appropriate.

                                     XV-2
<PAGE>

XVI. NONASSIGNABILITY
     ----------------

     A.   Assignments

          No benefit under the Plan shall be subject in any manner to
          anticipation, alienation, sale, transfer, assignment, pledge,
          encumbrance or charge, and any attempt so to anticipate, alienate,
          sell, transfer, assign, pledge, encumber, of charge the same shall be
          void, nor shall any such benefit be in any manner liable for or
          subject to the debts, contracts, liabilities, engagements, or torts of
          the person entitled to such benefit.

                                     XVI-1
<PAGE>

XVII.     TERMS OF EMPLOYMENT UNAFFECTED
          ------------------------------

          Participation in the Plan by an Employee shall in no way affect any of
          Sentinel's rights to assign such Employee to a different job or
          position; to change his title, authority, duties, or rate of
          compensation; or to terminate his employment.

                                    XVII-1
<PAGE>

XVIII.    CONSTRUCTION
          ------------

          The Plan shall be governed by and construed in accordance with the
          laws of the State of Delaware. Any interpretation of the Plan by the
          Benefit Board shall be conclusive and may be relied upon by the
          Trustee and all parties in interest.

                                    XVIII-1
<PAGE>

XIX.  MODIFICATION AND TERMINATION
      ----------------------------

      A.  Method of Modification

          Sentinel, by action of its Board, or by action of the Employee Benefit
          Plans Board as directed by the Board, may modify Chapter 1 of the Plan
          at any time and from time to time or may at any time terminate such
          Chapter. Any such modification or termination shall be effective at
          such date as the Board may determine but not earlier than the date on
          which Sentinel shall have given notice of such modification or
          termination to the Trustee and may be effective as to all affiliates
          of Sentinel, or as to one or more of them, and their respective
          employees. The Trustee shall promptly give notice of any such
          modification or termination to all affiliates of Sentinel affected
          thereby and their respective employees. A modification which affects
          the rights or duties of the Trustee may be made only with the consent
          of the Trustee. A modification may affect Employees participating in
          the Plan at the time thereof as well as future participants but may
          not diminish the account of any Employee as of the effective date of
          such modification.

          No amendment to the Plan shall be effective to the extent it has the
          effect of decreasing a Participant's accrued benefit. For purposes of
          this paragraph, a Plan amendment which has the effect of decreasing
          the Participant's account balance or eliminating an optional form of
          benefit, with respect to the benefits attributable to service before
          the amendment shall be treated as reducing an accrued benefit.

          The procedure for amending this Plan shall be by written action
          adopting the new or amended Plan language, indicating the effective
          date of the change, and signed by the members of the Board of
          Directors or its delegee. The procedure for delegation of the
          authority to amend the Plan shall be by written delegation naming the
          title(s) of the delegee(s), giving the effective date of the
          delegation, and signed by the Board of Directors or its delegee(s).

      B.  Rights of Members As A Result of Modification

          In the event that any modification of Chapter 1 of the Plan shall
          adversely affect the rights of any Employee participating therein as
          to the use of or withdrawal from his account, such Employee, for a
          period of 90 days after the effective date of such modification, shall
          have the option, to be exercised by written notice to the Trustee in
          form prescribed by the Benefit Board (a copy of which form of notice
          shall accompany the notice of modification), to withdraw his entire
          vested Employee Account as of the effective date of such modification,
          in which event, he shall be ineligible for participation in the Plan,
          as so modified, for a period of 6 full months from such effective
          date.

                                     XIX-1
<PAGE>

      C.  Merger, Transfer or Consolidation of Plan

          Sentinel, by action of its Board, may at any time, and for any reason,
          merge, consolidate, or transfer assets and liabilities to another
          plan, provided that if such merger, consolidation or transfer, or
          assets and liabilities, occurs after September 2, 1974, each
          Participant in the Plan would (if the Plan then terminated) receive a
          benefit immediately after such merger, consolidation, or transfer of
          assets and liabilities, which is equal to or greater than the benefit
          to which he would have been entitled to receive immediately before the
          merger, consolidation, or transfer (if the Plan had then terminated).

                                     XIX-2
<PAGE>

XX.  EFFECTIVE DATE
     --------------

     A.   Board of Directors' Approval

          Chapter 1 of the Plan shall not go into effect unless the Board shall
          duly vote to do so. The Board shall require that before Chapter 1 of
          the Plan goes into effect,

          1.   rulings with respect to Chapter 1 of the Plan, which are
               satisfactory to the Chairman of the Board of Sentinel or to any
               other officer thereof designated by the Chairman or by the Board,
               shall be obtained under the Internal Revenue Code, Securities Act
               of 1933, Exchange Act of 1934, and any other applicable
               legislation;

          2.   all other legal requirements pertaining to Chapter 1 of the Plan
               shall be complied with; and

          3.   all other steps necessary for the operation of Chapter 1 of the
               Plan shall be taken.

     B.   Trustee Certification

          Chapter 1 of the Plan shall go into effect on or after such date as
          may be fixed by the Board upon certification to the Trustee as
          follows:

          Certification by the Secretary or an Assistant Secretary of Sentinel
          of duly adopted resolutions of the Board directing that such Chapter
          of the Plan go into effect and fixing the date on or after which such
          Chapter of the Plan may become effective;

          Such certifications may be given, and Chapter 1 of the Plan may go
          into effect as aforesaid from time to time with respect to one or more
          of Sentinel's affiliates and/or with respect to employees located in
          one or more particular states. Such certifications may be withheld
          with respect to employees located in any state or states if, in the
          judgment of the Benefit Board, compliance with the laws of such state
          or states would involve disproportionate inconvenience and expense to
          Sentinel.

     C.   Any Employee who is now or may hereafter become a member of the Plan
          who is or becomes subject to Chapter 2 thereof may become a member
          subject to the provisions of Chapter 1, provided that the union by
          whom he is represented shall have, by proper and legal negotiation
          with such Employee's employer, adopted the provisions of Chapter 1 by
          contract with such employer. All Employees subject to Chapter 2 hereof
          shall be given the opportunity to become members subject to Chapter 1,
          provided, however, that no such Employee, nor the Union by whom he is
          represented, shall be given the opportunity to adopt the provisions of
          Chapter 1 of the Plan prior to the effective date of Chapter 1 of the
          Plan nor prior to the termination date of the Union negotiated
          contract to which such Employee is subject as of the effective date of
          Chapter 1 of the Plan (or as otherwise provided in such contract).

                                     XX-1
<PAGE>

XXI. OPERATION OF THE PLAN AS A TOP-HEAVY PLAN
     -----------------------------------------

     If it is determined that the Plan is a top-heavy plan, within the meaning
     of Section 416(g) of the Code, for any Plan Year, this Article will apply
     for such Plan Year, any provisions to the contrary notwithstanding.

     A.   Minimum Vesting

          Each Participant shall have a nonforfeitable right to a percentage of
          his accrued benefit derived from Company Contributions, as determined
          in accordance with the following table:

                   Years of             Nonforfeitable
                   Service              0 Percentage

               2 but less than 3             20%
               3 but less than 4             40%
               4 but less than 5             60%
               5 but less than 6             80%
               6 or more                    100%

          Periods of service disregarded under Article II.VV.2.b shall be
          disregarded for purposes of the preceding sentence. This Article XXI.A
          shall not apply if the Participant's nonforfeitable percentage of
          accrued benefit derived from Company Contributions would be greater if
          determined under Article II.VV. A Participant during any Plan Year in
          which the Plan is determined to be top-heavy who has completed three
          years of service, as determined pursuant to applicable Treasury
          Regulations, may irrevocably elect to have this Article XXI.A apply to
          all subsequent Plan Years in which the Plan is not top-heavy.

     B.   Minimum Contributions

          1.   Contributions by Sentinel, including Before Tax Savings under the
               Plan, in aggregation with all Defined Contribution Plans required
               to be aggregated under Code Section 416(g)(2)(A)(i), on behalf of
               each Participant who has not separated from service at end of the
               Plan Year and is a non-key Employee, shall not be less than 3
               percent of his Defined Compensation.

          2.   Notwithstanding Article XXI.B.1, no minimum contribution shall be
               required for any Participant who receives the minimum benefit
               under a Defined Benefit Plan of the Corporate Employer that is
               determined to be top-heavy for a year ending in a Plan Year for
               which the Plan is determined to be top-heavy.

     C.   Effect on Limitation on Annual Additions

          For any Plan Year in which the Plan is top-heavy, the combined
          limitation described in Article VI.A.2. shall be applied by
          substituting "1.0" for "1.25" wherever it appears in Article II.M. and
          P.

     D.   Definitions - For purposes of these top-heavy provisions, the
          following definitions shall apply:

          (a)  Key Employee shall mean any Employee or former Employee (and the
               beneficiaries of such Employee) who at any time during the
               determination period was an officer of the employer if such
               individual's annual compensation exceeds 50 percent of

                                     XXI-1
<PAGE>

               the dollar limitation under section 415(b)(1)(A) of the Code, an
               owner (or considered an owner under section 318 of the Code) of
               one of the ten largest interests in the employer if such
               individual's compensation exceeds 100 percent of the dollar
               limitation under section 415(c)(1)(A) of the Code, a 5 percent
               owner of the employer, or a 1-percent owner of the employer who
               has an annual compensation of more than $150,000. Compensation
               shall mean compensation as defined in section 415(c)(3) of the
               Code but specifically including amounts contributed by the
               employer pursuant to a salary reduction agreement.

          (b)  Top-heavy Ratio:  The Top-heavy Ratio for any Required or
               Permissive Aggregation Group as appropriate is a fraction, the
               numerator of which is the sum of the present value of accrued
               benefits under the aggregate Defined Benefit Plan or plans for
               all Key Employees, as of the Determination Date(s) (including any
               part of any accrued benefit distributed in the 5-year period
               ending on the Determination Date(s)) and the sum of account
               balances under the aggregated Defined Contribution Plan or plans
               for all Key Employees as of the Determination Date(s), and the
               denominator of which is the sum of the present value of accrued
               benefits under the Defined Benefit Plan or plans for all
               participants, as of the Determination Date(s) (including any part
               of any accrued benefit distributed in the 5-year period ending on
               the Determination Date(s)) and the account balances under the
               aggregated Defined Contribution Plan or Plans for all
               participants as of the Determination Date(s), all determined in
               accordance with section 416 of the Code and the regulations
               thereunder.  The account balances under a Defined Contribution
               Plan in both the numerator and denominator of the Top-heavy Ratio
               are increased for any distribution of an account balance made in
               the 5-year period ending on the Determination Date.

               The value of account balances and the present value of accrued
               benefits will be determined as of the most recent Valuation Date
               that falls within or ends with the 12-month period ending on the
               Determination Date, except as provided in section 416 of the Code
               and the regulations thereunder for the first and second plan
               years of a Defined Benefit Plan.  The account balances and
               accrued benefits of a Participant (1) who is not a Key Employee
               but who was a Key Employee in a prior year, or (2) who has not
               been credited with at least one Hour of Service with any employer
               maintaining the Plan at any time during the 5-year period ending
               on the Determination Date will be disregarded.  The calculation
               of the Top-heavy Ratio, and the extent to which distributions,
               rollovers, and transfers are taken into account will be made in
               accordance with section 416 of the Code and the regulations
               thereunder.  Deductible employee contributions, if any, will not
               be taken into account for purposes of computing the Top-heavy
               Ratio.  When aggregating plans the value of account balances and
               accrued benefits will be calculated with reference to the
               Determination Dates that fall within the same calendar year.

               The accrued benefit of a Participant other than a Key Employee
               shall be determined under (a) the method, if any, that uniformly
               applies for accrual purposes under all Defined Benefit Plans
               maintained by the employer, or (b) if there is no such method, as
               if such benefit accrued not more rapidly

                                     XXI-2
<PAGE>

               than the slowest accrual rate permitted under the fractional rule
               of section 411(b)(1)(C) of the Code.

          (c)  Aggregation group:  A Required Aggregation Group is (1) each
               qualified plan of the employer in which at least one Key Employee
               participates or participated at any time during the determination
               period (regardless of whether the plan has terminated), and (2)
               any other qualified plan of the employer which enables a plan
               described in (1) to meet the requirements of sections 401(a)(4)
               or 410 of the Code.  A Permissive Aggregation Group is  the
               Required Aggregation Group of plans plus any other plan or plans
               of the employer which, when considered as a group with the
               Required Aggregation Group, would continue to satisfy the
               requirements of sections 401(a)(4) and 410 of the Code.

          (d)  Determination Date.  The determination date for any Plan Year
               shall be December 31 of the preceding Plan Year.

          (e)  Valuation Date.  The valuation date applicable to the
               determination date for any Plan Year shall be December 31 of the
               preceding Plan Year.

          (f)  Top-heavy Plan.  This Plan is a Top-heavy plan if any of the
               following conditions exist:

               (i)    If the Top-heavy Ratio for this Plan exceeds 60 percent
                      and this Plan is not part of any Required Aggregation
                      Group or Permissive Aggregation Group of plans.

               (ii)   If this Plan is a part of a Required Aggregation Group of
                      plans but not part of a Permissive Aggregation Group and
                      the Top-heavy Ratio for the group of plans exceeds 60
                      percent.

               (iii)  If this Plan is a part of a Required Aggregation Group and
                      part of a Permissive Aggregation Group of plans and the
                      Top-heavy Ratio for the Permissive Aggregation Group
                      exceeds 60 percent.

                                     XXI-3
<PAGE>

XXII.  QUALIFIED DOMESTIC RELATIONS ORDERS

       Notwithstanding other provisions of the Plan which restrict payments from
       the Plan to a non-Member, the Trustee may, upon receipt of a qualified
       domestic relations order, make payments from the Plan to persons other
       than the Member.

       A.   Status of a Qualified Domestic Relations Order

            A domestic relations order will not be deemed to be a qualified
            domestic relations order if it requires action by the Plan that does
            not relate to child support, alimony payments, or marital property
            rights, and does not conform to other requirements established by
            the Benefit Board, which requirements shall comply with Code Section
            414(p).

       B.   Distribution of Before Tax Account Funds

            Distribution of Before Tax Account funds to an alternate payee
            pursuant to a Qualified Domestic Relations Order shall not be
            subject to the restrictions on withdrawal of Before Tax Account
            funds described in Articles X.B.3. and X.C.2. of the Plan.

                                    XXII-1
<PAGE>

XXIII     ROLLOVERS AND TRUST TO TRUST TRANSFERS
          --------------------------------------

          A.   Subject to the requirements of the Code, the Plan and the Trustee
               may accept for:

               1.   A Member who, while employed by the Company or an Affiliated
                    Company, has taken, after December 31, 1992, normal, early
                    or incapacity retirement pursuant to Section 4.(2)(a), (b),
                    or (c) or Section 23.(4)(a), (b) or (c) of the Retirement
                    Plan or a Spouse Beneficiary Member, a Participant and an
                    Employee, who would be eligible to be a Participant, except
                    that he has not yet satisfied the requirements of Article
                    III.A.2., 3. or 4. of the Plan , while employed by the
                    Company, a rollover or trust to trust transfer of assets
                    received from a defined contribution or defined benefit plan
                    or assets received from an individual retirement account, as
                    described in Code Section 408(d)(3)(A)(ii).

               2.   A Member with an Employee Account who was employed by the
                    Company in connection with the acquisition of a business or
                    facility by the Company, while employed by the Company, a
                    trust-to-trust transfer of assets in cash from the trustees
                    of a qualified defined contribution plan, as provided for in
                    an agreement between the Company, and the Seller of the
                    business or facility maintaining or contributing to the plan
                    from which the assets are to received. The cash received
                    will be deposited in the Fixed Income Account Fund (Option
                    B.) and allocated to each Employee Account based on the
                    value of a unit on the day in which the transfer takes
                    place. Any and all assets so transferred will not be
                    eligible for matching Company contributions under Article
                    V.A.

                    Service with the seller by an Employee may be recognized for
                    purposes of eligibility in this Plan; participation in the
                    seller's plan by an Employee who enrolls in this Plan and
                    whose entire account assets are transferred to this Plan,
                    may be recognized for purposes of vesting in future benefits
                    accrued under this Plan. All assets of an Employee
                    transferred to this Plan pursuant to Article XXIII.4. shall
                    be immediately vested.

                    Any assets transferred or rolled over must be in the form of
                    cash and/or DuPont common stock. Any assets rolled over
                    must be rolled over as provided in Code Section 402(a)(b)
                    and must have been received by the Member or a Spouse
                    Beneficiary Member in a qualified distribution from a
                    qualified defined contribution plan, a qualified defined
                    benefit plan or an individual retirement account as
                    described in Code Section 408(d)(3)(A)(ii). Only taxable
                    amounts may be rolled over under this Article XXIII. The
                    cash received will be allocated to the Investment Options
                    set forth in Article VII.C. of the Plan pursuant to the
                    administrative rules adopted by the Plan Administrator. The
                    DuPont common stock received will be allocated to Option A.
                    of Article VII.C. of the Plan and shall remain there until
                    it may be transferred to the Investment Options set forth in
                    Article VII of the Plan pursuant to the administrative rules
                    adopted by the Plan Administrator.

          B.   This Article XXIII.B. applies to distributions made on or after
               January 1, 1993.

                                    XXIII-1
<PAGE>

          1.   Notwithstanding any provision of this Plan to the contrary that
               would otherwise limit a distributee's election under this Article
               XXIII.B., a distributee may elect, at any time and in the manner
               prescribed by the Benefit Board, to have any portion of an
               eligible rollover distribution paid directly to an eligible
               retirement plan specified by the distributee in a direct
               rollover.

          2.   Definitions

               a.   An eligible rollover distribution is any distribution of all
                    or any portion of the balance to the credit of the
                    distributee, except that an eligible rollover distribution
                    does not include:

                    i.   any distribution that is one of a series of
                         substantially equal periodic payments made (not less
                         frequently than annually) for the life (or life
                         expectancy) of the distributee or the joint lives (or
                         joint life expectancies) of the distributee and
                         distributee's designated beneficiary, or for a period
                         of ten years or more;

                    ii.  any distribution to the extent such distribution is
                         required under Section 401(a)(9) of the Code; and

                    iii. the portion of any distribution that is not includible
                         in gross income (determined without regard to the
                         exclusion for net unrealized appreciation with respect
                         to employer securities).

               b.   An eligible retirement plan is an individual retirement
                    account described in Section 408(a) of the Code, an annuity
                    plan described in Section 403(a) of the Code, or a qualified
                    trust described in Section 401(a) of the Code that accepts
                    the distributee's eligible rollover distribution.  However,
                    in the case of an eligible rollover distribution to the
                    surviving spouse, an eligible retirement plan is an
                    individual retirement account or individual retirement
                    annuity.

               c.   A distributee includes an employee or a former employee (who
                    became a Member of the Plan).  In addition, the employee's
                    or former employee's surviving spouse and the employee's or
                    former employee's spouse or former spouse who is the
                    alternate payee under a qualified domestic relations order
                    as defined in Section 414(p) of the Code, are distributees
                    with regard to the interest of the spouse or former spouse.

               d.   A direct rollover is a payment by this Plan to the eligible
                    retirement plan specified by the distributee.

                                    XXIII-2
<PAGE>

                     THRIFT PLAN FOR EMPLOYEES OF SENTINEL
                     -------------------------------------

                                   CHAPTER 2
                                   ---------

Those union-represented employees covered by a negotiated contract shall have
the provisions of Chapter 1, applicable to those nonrepresented employees,
except those unions listed on the appendices that follow shall not have the
provisions of Chapter 1, so described for such appendices, applicable to their
union-represented employees.

Appendix I :  Employees excluded from participation in Chapter 1

Employees represented by a negotiated contract with the Teamsters at the
following locations:

Richmond, Virginia
Parkersburg, West Virginia
Louisville, Kentucky
Chattanooga, Tennessee

                                 Appendix D-i
<PAGE>

                             PROPOSED RESOLUTIONS
                          OF THE BOARD OF DIRECTORS OF
                        SENTINEL TRANSPORTATION COMPANY

     WHEREAS,  the Board of Directors of Sentinel Transportation Company (the
"Company") adopted the Thrift Plan for Employees of Sentinel Transportation
Company (the "Plan"), effective January 1, 1996, for its eligible employees;
and

     WHEREAS,  Sentinel has determined that it is in the best interest of
participants in the Plan to amend the Plan to eliminate the one year of service
requirement for eligibility to participate in the Plan and to make other changes
to implement the provisions of the Small Business Job Protection Act and reflect
corporate affiliation changes since the original adoption of the Plan:

     NOW, THEREFORE, BE IT

     RESOLVED, that Amendment No. 1 to the Plan is adopted in the form attached
hereto;  and

     FURTHER RESOLVED, that the President of the Company or his delegate is
hereby authorized and directed to take all actions necessary or desirable to
implement such Amendment No. 1, including but not limited to submitting the Plan
as amended to the Internal Revenue Service for a favorable ruling on the Plan's
tax qualified status.
<PAGE>

                          THRIFT PLAN FOR EMPLOYEES OF
                        SENTINEL TRANSPORTATION COMPANY
                             RULES AND REGULATIONS
                          (Effective January 1, 1996)

                                AMENDMENT NO. 1
                                ---------------

The Thrift Plan for Employees of  Sentinel Transportation Company Rules and
Regulations (Effective January 1, 1996) (the "Plan") is amended as follows:

1.   Effective January 1, 1996, Article II of the Plan is amended by deleting
Section C. in its entirety and replacing it with the following:

          "C. `Basic Deposits' shall mean all deposits made by a Participant to
          his Employee Account pursuant to Article IV.A."

2.    Effective January 1, 1997, Article II of the Plan is amended by deleting
the third paragraph of Section I.

3.   Effective January 1, 1997, Article II of the Plan is amended by deleting
Section W. in its entirety and replacing it with the following:

          "W.  A `Highly Compensated' Employee shall mean an Employee who

               1. was a five percent (5%) owner (as defined in Section 416(i)(1)
               of the Code) of Sentinel during the Plan Year in question or the
               preceding Plan Year, or

               2. for the preceding Plan Year, received compensation in excess
               of $80,000 and was in the top-paid group of employees (as defined
               in Section 414(q) of the Code).

          This definition shall be applied in accordance with Section 414(q) of
          the Code. The $80,000 amount shall be adjusted automatically if and to
          the extent the corresponding amount applicable under Section 414(q) of
          the Code is adjusted by the Secretary of the Treasury."

4.    Effective January 1, 1996, Article II of the Plan is amended to clarify
the correct name of the retirement plan covering Sentinel employees by deleting
Section OO. in its entirety and replacing it with the following:

          "OO. `Retirement Plan' shall mean the E. I. DuPont de Nemours and
          Company Pension and Retirement Plan, as applicable to Employees of
          Sentinel Transportation Company."

5.    Effective March 1, 1999, Article III of the Plan is amended by deleting
Section A. in its entirety and replacing it with the following:

          "A.   Eligibility Requirements

          Each Employee is eligible to participate in the Plan."
<PAGE>

6.    Effective March 1, 1999, Article III of the Plan is amended by deleting
paragraph 1. of Section B. in its entirety and replacing it with the following:

          "1. An Employee may commence his participation on the first day of the
          second calendar month following his date of hire as an Employee, or as
          of the first day of any subsequent calendar month, provided he files
          with the Benefit Board or its delegate a notice of his election to
          become a Participant in the Plan, such notice to be in the manner
          prescribed by the Benefit Board, provided that no Employee who is on a
          Sentinel approved leave of absence or is otherwise absent from work
          may become a Participant in the Plan until the day of his return from
          such absence. Commencement of participation in the Plan by an eligible
          Employee shall be accomplished by his election to make deposits as
          hereinafter provided."

7.   Effective January 1, 1997, Article IV.C.2. of the Plan is amended by
deleting subparagraph a. in its entirety and replacing it with the following:

          "Determination of the amount of Excess Contributions for a Highly
          Compensated Participant shall be made reducing the salary deferrals of
          the Highly Compensated Participants, in order of dollar amount of
          deferral beginning with the highest dollar amount of deferral, to the
          extent necessary to satisfy the actual deferral percentage ("ADP")
          test. The amount of Excess Contributions for a Highly Compensated
          Participant will be equal to the total of elective contributions taken
          into account for the ADP test minus the product of the employee's
          reduced actual deferral ratio ("ADR") as determined above and the
          employee's compensation."

8.   Effective January 1, 1997, Article IV.C.2. of the Plan is amended by
deleting subparagraph c. in its entirety and renumbering the following
subparagraphs accordingly.

9.   Effective January 1, 1999, all references to the "Fixed Income Fund" shall
be replaced with references to the "Stable Value Fund."

10.  Effective January 1, 1999, Article VII is amended by deleting paragraph 3.
of section F. in its entirety and replacing it with the following:

          "The assets of the Stable Value fund and the Three-Way Asset
          Allocation Fund under this Plan may be held by the Trustee in trust in
          common with funds of the same name under tax-qualified employee
          benefit plans sponsored by an affiliate of Sentinel. In such case, the
          Trustee shall be under no duty to earmark or keep separate the assets
          of such commingled funds and a determination on the valuation date of
          the value of such funds under this Plan shall be determined in
          conjunction with the corresponding determinations made under such
          other plans as though such funds under this Plan and the corresponding
          funds under such other plans were one fund for this purposes. The
          Trustee shall, however, maintain a separate account reflecting the
          equitable share in the assets of the Stable Value Fund and the Three-
          Way asset Allocation Fund under this Plan and the corresponding funds
          in such other plans. Sentinel may, at any time, direct the Trustee to
          segregate and withdraw the equitable share in such assets of the
          Stable Value Fund and the Three-Way Asset Allocation Fund of this
          Plan. The Trustee's valuation of assets for the purpose of such
          withdrawals shall be conclusive."
<PAGE>

11.   Effective January 1, 1999, Article X.B.1. is amended by replacing the
references to  `$3,500" with references to "5,000."

12.   Effective January 1, 1996, Article XIV is amended by adding a new Section
J. to read as follows:

     "Military Service

     Notwithstanding any provision of this Plan to the contrary, contributions,
     benefits and service credit with respect to qualified military service will
     be provided in accordance with Section 414(u) of the Code."
<PAGE>

                             PROPOSED RESOLUTIONS
                         OF THE BOARD OF DIRECTORS OF
                        SENTINEL TRANSPORTATION COMPANY

     WHEREAS, the Board of Directors of Sentinel Transportation Company (the
"Company") adopted the Thrift Plan for Employees of Sentinel Transportation
Company (the "Plan"), effective January 1, 1996, for its eligible employees;
and

     WHEREAS, the Board of Directors, or its delegate, is authorized under
Section XIX.A. to amend the Plan at any time; and

     WHEREAS, the Board of Directors is authorized under Section XIV.A.4. to
appoint such investment managers to manage any or all assets of the Plan; and

     WHEREAS, the Board of Directors wishes to amend the Plan to permit
participants in the Plan to direct a portion of their Plan accounts to be
invested in shares of Class B common stock of Conoco Inc. acquired as a result
of the tender offer of such shares; and

     WHEREAS, the Board of Directors wishes to appoint DuPont Capital Management
Company ("DCMC") as investment manager to manage the Stable Value Fund assets
held under the Plan, subject to execution of an investment management agreement
between the Company and DCMC, and to authorize the Employee Benefit Plans Board
to enter into an investment management agreement with DCMC; and

     WHEREAS, the Board of Directors wishes to amend the Plan to permit an
investment manager appointed under the Plan to appoint additional investment
managers to manage all or a part of the assets for which the original investment
manager holds authority.

     NOW, THEREFORE, BE IT

     RESOLVED, that Amendment No. 2 to the Plan is adopted in the form attached
hereto; and

     FURTHER RESOLVED, that DCMC is appointed investment manager of the Stable
Value Fund of the Plan, subject to execution of an investment management
agreement between the Company and DCMC, and DCMC is hereby authorized, to the
extent consistent with the terms of such investment management agreement, to
appoint additional investment managers to manage all or part of the assets for
which investment management authority is delegated to DCMC under the terms of
such investment management agreement; and

     FURTHER RESOLVED, that the Employee Benefit Plans Board, by action of any
one of its members, is hereby authorized to enter into an investment management
agreement with DCMC; and

     FURTHER RESOLVED, that the President of the Company or his delegate is
hereby authorized and directed to take all actions necessary or desirable to
implement such Amendment No. 2, including but not limited to submitting the Plan
as amended to the Internal Revenue Service for a favorable ruling on the Plan's
tax qualified status and executing any amendment requested by the Internal
Revenue Service as a condition of issuing such favorable ruling.
<PAGE>

                         THRIFT PLAN FOR EMPLOYEES OF
                        SENTINEL TRANSPORTATION COMPANY
                             RULES AND REGULATIONS
                          (Effective January 1, 1996)

                                AMENDMENT NO. 2
                                ---------------

The Thrift Plan for Employees of Sentinel Transportation Company Rules and
Regulations (Effective January 1, 1996) (the "Plan") is amended as follows:

1.   Effective August 1, 1999, Article VII of the Plan is amended by deleting
Section C. in its entirety and replacing it with the following:

       "C.  Investment Option Funds

            The Trustee shall provide for the following Investment Option Funds
for Plan Members.

            1. Option A:  DuPont Stock Fund

               Amounts deposited in Option A shall be invested in shares of
               common stock of E. I. du Pont de Nemours and Company.  Such
               purchases shall be made in the open market, or from DuPont if it
               shall have made treasury or authorized but unissued shares
               available for such purchases, in which event the purchase price
               shall be the closing price of such stock as reported on the New
               York Stock Exchange - Composite Transactions on the last trading
               day preceding the date of such purchase from DuPont.

            2. Option B:  Stable Value Fund

               Amounts invested in the Stable Value Fund shall be invested so as
               to preserve principal and to pay a stable rate of return over
               time.  Amounts deposited in the Stable Value Fund shall be
               delivered to the Trustee and invested as designated by the
               Company, or its delegee or a designated Investment Manager chosen
               by the Company, pursuant to arrangements with one or more
               entities, including, but not limited to, insurance companies,
               banks and other investment organizations and/or Investment
               Managers, the object of which is to preserve principal and
               provide a stable rate of return.  In addition, a portion of the
               Stable Value fund shall be invested in short-term fund(s) so as
               to provide sufficient liquidity to accommodate daily trading
               activity.

            3. Option C:  Mutual Funds and Other Equity Investment Vehicles

               Amounts deposited in Fund C shall be invested, as directed by
               Members, in one or more mutual funds or other equity investment
               vehicles designated by the Company.

            4. Option D:  Asset Allocation Funds

               Amounts deposited in Fund E shall be invested in an asset
               allocation fund consisting of a portfolio diversified among the
               stock, bond, and cash sectors of the securities marketplace, or
               in an asset allocation portfolio diversified among
<PAGE>

               the Plan's Stable Value Fund and one or more equity investment
               vehicles. Assets in Fund D are transferred among these sectors in
               such manner and to such extent as the fund manager of the
               applicable asset allocation fund shall select.

            5. Option E:  Loan Account Fund

               Amounts transferred to Fund L from the other funds shall be
               loaned to Members.

            6. Option F:  Conoco Class B Stock Fund

               Amounts deposited in Fund F shall be invested in shares of Class
               B stock of Conoco Inc., provided, however, that Fund F shall be
               offered as an investment option under the Plan only upon the
               effective date of the one-time initial tender offer of Class B
               stock of Conoco Inc., and no amounts may be invested in Fund F
               other than as a result of such initial tender offer (or as
               transferred from another tax-qualified plan, as otherwise
               permitted under the Plan).  If the tender offer does not occur,
               this Section 6 shall not become effective.  Notwithstanding any
               other provision of this Plan to the contrary, an accountholder
               may authorize the transfer of all or part of the value of his
               account invested in Fund F into any other investment fund
               available under the Plan, but may not authorize any transfer into
               Fund F other than as a result of the tender offer.  Dividends
               paid with respect to shares of Class B stock of Conoco Inc. shall
               not be invested in Fund F, but shall instead be invested
               according to an accountholder's current investment directions.
               Fund F shall be treated as an investment fund other than Fund E
               for determining availability of loans and withdrawals and for all
               other purposes as appropriate under this Plan."

2.  Effective August 1, 1999, Article VII.F. of the Plan is amended by deleting
paragraphs 1. and 2. in their entirety and replacing them with the following:

    " 1. Each accountholder shall be entitled to direct the Trustee as to the
    manner in which voting rights with respect to the shares or units
    represented by the accountholder's Employee Account invested in each
    Investment Option are to be exercised. The Trustee shall vote the number of
    shares or units in accordance with such instructions. Any such instructions
    with respect to shares of common stock of E. I. du Pont de Nemours and
    Company held in Option A shall remain in the strict confidence of the
    Trustee. Except with respect to shares of common stock of E. I. du Pont de
    Nemours and Company held in Option A, if an accountholder does not return
    proper voting instructions in a timely manner, such inaction shall be deemed
    an election not to vote such shares or to vote such shares as the default
    option described on the proxy voting instructions, as applicable.

    2. Each accountholder shall be entitled to direct the Trustee as to whether
    to exercise a tender or exchange offer with respect to any shares of common
    stock of E. I. du Pont de Nemours and Company held in Option A. The Trustee
    shall tender or exchange such shares in accordance with such instructions.
    Any such instructions with respect to shares of common stock of E. I. du
    Pont de Nemours and Company held in Option A shall remain in the strict
    confidence of the Trustee. If an accountholder does not return proper tender
    or exchange instructions to the Trustee in a timely manner, such inaction by
    the accountholder shall be deemed a decision not to tender or exchange, and
    the Trustee shall not tender or exchange shares credited to such
    accountholder's account."

3.  Effective October 1, 1998, Article VIII.A. of the Plan is amended by
deleting paragraph 4. in its entirety and replacing it with the following:
<PAGE>

     "The share price of any mutual fund or other equity investment vehicle
     purchased under Option C. shall be the net asset value calculated by
     Merrill Lynch Asset Management, or the applicable fund manager, determined
     on each New York Stock Exchange business day.  Such net asset value shall
     include the costs and charges used by such manager to establish the net
     asset value."

4. Effective October 1, 1998, Article VIII.A. of the Plan is amended to reflect
the name change of Wells Fargo Nikko Investment Advisors to Barclays Global
Investors and to add reference to additional manager by deleting paragraph 5. in
its entirety and replacing it with the following:

     "The unit value of units purchased under Option D. shall be calculated by
     Barclays Global Investors, or Merrill Lynch Asset Management, or such other
     manager, as applicable, each business day. Such unit value shall include
     all costs and charges used by such manager to establish that value."

5. Effective August 1, 1999, Article XIV.A. of the Plan is amended by deleting
paragraph 4 in its entirety and replacing it with the following:

     "4.  from time to time by action of its Board of Directors designate or
     appoint such Investment Managers as the Board deems necessary to manage and
     invest any portion or all of the Plan assets, and to delegate to such
     Investment Managers the power and authority to delegate to and enter into
     agreements with such additional Investment Managers as such original
     Investment Managers deem necessary or appropriate to manage all or part of
     the assets for which such original Investment Manager has been delegated
     management or investment authority, and by action of an officer of the
     Company who is a member of the Benefit Board remove such Investment
     Managers."

6. Effective August 1, 1999, Article XIV.B. of the Plan is amended by deleting
the last sentence thereof and replacing it with the following:

     " The Trustee shall be subject to the directions of the Benefit Board, or a
     designated Investment Manager, and shall comply with such directions,
     except with regard to voting with respect to shares held by the Trustee and
     the purchase and sale or redemption of securities which shall be Trustee
     responsibilities."
<PAGE>

                             PROPOSED RESOLUTIONS
                         OF THE BOARD OF DIRECTORS OF
                        SENTINEL TRANSPORTATION COMPANY

     WHEREAS, the Board of Directors of Sentinel Transportation Company (the
"Company") adopted the Thrift Plan for Employees of Sentinel Transportation
Company (the "Plan"), effective January 1, 1996, for its eligible employees; and

     WHEREAS, the Board of Directors, or its delegate, is authorized under
Section XIX.A. to amend the Plan at any time; and

     WHEREAS, the Board of Directors wishes to amend the Plan as requested by
the Internal Revenue Service as a condition of issuing a favorable determination
letter on the Plan's tax-qualified status.

     NOW, THEREFORE, BE IT

     RESOLVED, that Amendment No. 3 to the Plan is adopted in the form attached
hereto; and

     FURTHER RESOLVED, that the President of the Company or his delegate is
hereby authorized and directed to take all actions necessary or desirable to
implement such Amendment No. 3.
<PAGE>

                         THRIFT PLAN FOR EMPLOYEES OF
                        SENTINEL TRANSPORTATION COMPANY
                             RULES AND REGULATIONS
                          (Effective January 1, 1996)

                                AMENDMENT NO. 3
                                ---------------

The Thrift Plan for Employees of Sentinel Transportation Company Rules and
Regulations (Effective January 1, 1996) (the "Plan") is amended as follows:

1. Effective January 1, 1997, Article IV.C.2. of the Plan is amended by
deleting the initial introductory paragraph and subparagraphs a. and b. in their
entirety and replacing them with the following:

     "If it is determined after the close of a Plan Year that participation by
     Highly Compensated Participants has exceeded the discrimination standards
     of Code sections 401(k) ("Excess Contributions") or 401(m) ("Excess
     Aggregate Contributions"), the amount of the Excess Contributions or Excess
     Aggregate Contributions shall be refunded to the Highly Compensated
     Participants in accordance with the following rules.  Excess Contributions
     and Excess Aggregate Contributions shall be determined by comparing actual
     deferral and actual contribution ratios of Highly Compensated Participants
     against ratios for non-Highly Compensated Participants for each current
     plan year (rather than for the prior plan year).

     a. Correction of Excess Contributions shall be made by reducing the salary
     deferrals of the Highly Compensated Participants, in order of dollar amount
     of deferral beginning with the highest dollar amount of deferral, to the
     extent necessary to satisfy the actual deferral percentage ("ADP") test.
     The amount of Excess Contributions for a Highly Compensated Participant
     will be equal to the total of elective contributions taken into account for
     the ADP test minus the product of the employee's reduced actual deferral
     ratio ("ADR") as determined above and the employee's compensation.

     b. Correction of Excess Aggregate Contributions shall be made by reducing
     the salary deferrals of the Highly Compensated Participants, in order of
     dollar amount of Company matching contributions and Employee after-tax
     contributions beginning with the highest dollar amount of matching
     contributions and Employee after-tax contributions, to the extent necessary
     to satisfy the actual contribution percentage ("ADP") test. The amount of
     Excess Aggregate Contributions for a Highly Compensated Participant will be
     equal to the total of Company matching contributions and Employee after-tax
     contributions taken into account for the ACP test minus the product of the
     employee's reduced actual contribution ratio ("ACR") as determined above
     and the employee's compensation."

2. Effective January 1, 1997, Article II of the Plan is amended by deleting
Section W. in its entirety and replacing it with the following:

     "W.  A `Highly Compensated' Employee shall mean an Employee who

            1. was a five percent (5%) owner (as defined in Section 416(i)(1)
            of the Code) of the Corporate Employer during the Plan Year in
            question or the preceding Plan Year, or

            2. for the preceding Plan Year, received compensation in excess of
            $80,000 and was in the top-paid group of employees (as defined in
            Section 414(q) of the Code) of the Corporate Employer.
<PAGE>

     This definition shall be applied in accordance with Section 414(q) of the
     Code.  Compensation for purposes of this definition shall mean "Defined
     Compensation" but including salary deferrals under Code sections 125 and
     401(k).  The $80,000 amount shall be adjusted automatically if and to the
     extent the corresponding amount applicable under Section 414(q) of the Code
     is adjusted by the Secretary of the Treasury."

3.   Effective January 1, 1996, Article II of the Plan is amended by deleting
Section VV. in its entirety and replacing it with the following:

     "VV.  "'Vesting (vested)' shall mean the nonforfeitable right of a
     Participant in the Plan to his total Regular Account, which shall be
     acquired only on the earlier of:

     1. Five years of participation since the most recent date of enrollment in
        the Plan, a year of participation being defined as twelve consecutive
        months during which a non-vested Participant maintains a positive
        account balance or makes at least one monthly contribution, except that
        the fifth year of participation shall be deemed a year of participation
        upon the first day of the fifth month of the 12 month period; or

     2. Five years of service, any such year commencing upon the Employee's
        Employment Date, and anniversary date thereof (or, if applicable,
        Reemployment Date and anniversary date thereof), during which an
        Employee completes 1,000 or more hours of service with the Corporate
        Employer; provided that service subsequent to five consecutive One-Year
        Breaks-in-Service shall not count toward vesting a Participant's
        Employee Account which accumulated prior to such five One-Year
        Breaks-in-Service; or

     3. Attainment of age 65, which is the Normal Retirement Date under this
        Plan.

     A Member shall be vested in his Before-Tax Account and in that portion of
     his Regular Account derived from his Employee Contributions at all times.
     The portion of a Member's Regular Account derived from his Employee
     Contributions is his Basic Deposits and Supplemental Deposits and all
     income, gains and losses attributable thereto.

     If a Member is Vested when he ceases to be an Employee, he shall be Vested
     upon becoming an Employee again thereafter.  If a Member is not Vested when
     he ceases to be an Employee, and he becomes an Employee again thereafter,
     his prebreak service shall be disregarded in determining the Vesting of his
     post-break account only if the number of consecutive One-Year Breaks in
     Service equals or exceeds the greater of five or the aggregate number of
     the Member's years of service prior to the break in service.

     Service for purposes of Vesting shall include service credited to the
     Employee for vesting purposes under the terms of the Thrift Plan for
     Employees of Conoco Inc. as of December 31, 1995."

4.   Effective January 1, 1996 through February 29, 1999, Article III. of the
Plan is amended by deleting Section A. in its entirety and replacing it with the
following:

     "A.  Eligibility Requirements

     Except as hereinafter otherwise provided, eligibility for participation in
     the Plan shall be open to:
<PAGE>

     1.  any full-time, regular Employee whose Employment Date or Reemployment
         Date is earlier than January 1, 1993, who became a member of the
         Retirement Plan before January 1, 1993 and continues to maintain
         membership therein;

     2.  any full-time, regular Employee who has completed at least one year of
         continuous service or who was eligible to participate in a qualified
         profit-sharing plan of an Affiliated Company from which he was
         transferred;

     3.  any Employee who has completed a period of 12 consecutive months
         commencing on the Employee's Employment Date or Reemployment Date,
         whichever is applicable, or a succeeding anniversary of such date,
         during which he completes 1,000 or more Hours of Service; and

     4.  any Employee, including a Member who is rehired and again becomes an
         Employee, who previously met the requirements of this Article III.A.

     For purposes of Article III.A.2. only, "continuous service" is the period
     of time that has elapsed since the Employee's original Employment Date or
     Reemployment Date since his last termination of employment with Sentinel.

     For purposes of this Article III.A. only, an Employee will be treated as
     having completed 190 hours of service for each month in which he completes
     at lest one Hour of Service."

5. Effective January 1, 1996, Section XXI.B. is amended by deleting paragraph
1. in its entirety and replacing it with the following:

     "1.  Contributions by Sentinel, in aggregation with all Defined
     Contribution Plans required to be aggregated under Code section
     416(g)(2)(A)(I), on behalf of each Participant who has not separated from
     service at the end of the Plan year and is a non-Key Employee, shall not be
     less than 3 percent of his Defined Compensation."

6. Effective January 1, 1996, Section XXI.D. is amended by deleting paragraph
(d) in its entirety and replacing it with the following:

     "(d)  Determination Date.  The determination date for any Plan Year shall
     be December 31 of the preceding Plan Year, or, in the case of the first
     Plan Year, the last day of such first Plan Year."<PAGE>

                                 EXHIBIT 4(b)
                         Optimum Quality Grains, L.L.C.
                           Retirement and Savings Plan

               (As Amended and Restated Effective January 1, 1998)
<PAGE>

                                TABLE OF CONTENTS
                                -----------------

                                                                            PAGE
                                                                            ----
    I. PURPOSE                                                               1

   II. PARTICIPATION                                                         1

  III. ENROLLMENT                                                            1

   IV. AFTER-TAX AND BEFORE-TAX AMOUNTS                                      1

          1.  Amount of After-Tax and Before-Tax Contributions               1
          2.  Change in Amount of After-Tax and Before-Tax Contributions     5
          3.  Collection of After-Tax Contributions                          5
          4.  Voluntary Suspension of After-Tax and Before-Tax Contributions 5

    V. COMPANY CONTRIBUTION                                                  5

          1.  Matching Contributions                                         5
          2.  Profit Sharing Contributions                                   6

   VI. INVESTMENT FUNDS                                                      6

          1.  Reserved                                                       6
          2.  Fund B - Fixed Income                                          6
          3.  Fund C - Mutual Funds and Other Investments                    7
          4.  Fund D - DuPont Common Stock                                   7
          5   Fund L - Loans                                                 7
          6.  Fund F - Conoco Class B Stock                                  7
          7.  Fund P - Pioneer Common Stock                                  7

  VII. INVESTMENT DIRECTION                                                  7
          1.  Investment of After-Tax Contributions                          7
          2.  Investment of Before-Tax Contributions                         8
          3.  Investment of Company Contribution                             8
          4.  Change in Investment Direction                                 8
          5.  Separate Accounting and Nonforfeitability                      8

 VIII. FUND TRANSFERS                                                        8

          1.  Transfers Among Funds B, C, D and P                            8
          2.  Transfers to Fund L from Funds B, C, D and P                   9
          3.  Transfers to Funds B, C, D and P from Fund L                   9

   IX. RESERVED                                                              9

    X. OPERATION OF FUNDS B and C                                           10

          1.  Fund Investments                                              10
          2.  Fund Valuation                                                10
          3.  Fund Units or Shares                                          11
          4.  Voting of Shares                                              11

<PAGE>

   XI. OPERATION OF FUNDS D AND P                                           12

          1.  Purchase of DuPont Common Stock                               12
          2.  Account Holder's Account                                      12
          3.  Valuation of Fund D                                           12
          4.  Voting and Tender of Shares                                   13
          5.  Operation of Fund P                                           13

  XII. OPERATION OF FUND L                                                  14

          1.  Establishment of Loan Account                                 14
          2.  Interest                                                      14
          3.  Repayments                                                    14
          4.  Fund Valuation                                                14

 XIII. PARTICIPANT LOANS                                                    14

          1.  Determination of Borrowable Account Balance                   14
          2.  Amount of Loan                                                15
          3.  Interest                                                      15
          4.  Term of Loans                                                 15
          5.  Repayment                                                     15
          6.  Declaration and Notice of Default                             16
          7.  Deemed Withdrawal                                             17
          8.  General Conditions                                            18

  XIV. WITHDRAWALS                                                          19

          1.  General Conditions                                            19
          2.  Withdrawal Sequence                                           20
          3.  Withdrawal Maximum                                            21

   XV. HARDSHIP WITHDRAWALS FROM BEFORE-TAX ACCOUNT                         21

          1.  Definition of Hardship                                        21
          2.  Establishment of Immediate and Heavy Financial Need           21
          3.  Distribution Necessary to Satisfy
              Immediate and Heavy Financial Need                            22
          4.  Amount Withdrawable                                           22
          5.  Forfeitures and Suspensions                                   23

  XVI. TERMINATION OF PARTICIPATION                                         23

          1.  General Conditions                                            23
          2.  Terminations Without Forfeiture                               23
          3.  Terminations With Forfeiture                                  24
          4.  Distribution of Accounts                                      25

                                       -ii-
<PAGE>

          5.  Form of Payment                                               29
          6.  Reenrollment in Plan                                          30

 XVII. NONASSIGNMENT                                                        30

XVIII. OPERATION OF THE PLAN AS A TOP-HEAVY PLAN                            30

          1.  Minimum Vesting                                               31
          2.  Minimum Contributions                                         31
          3.  Compensation Limitation                                       31
          4.  Effect on Limitation on Annual Additions                      31
          5.  Definitions                                                   31

  XIX. MISCELLANEOUS PROVISIONS                                             32

          1.  Plan Administration                                           32
          2.  Administrative Expense                                        34
          3.  Modification or Termination                                   34
          4.  Transition to Amended Plan                                    34
          5.  Transfer of Assets                                            34
          6.  No Guarantee of Security Values                               36
          7.  Limitations on Annual Additions                               36
          8.  Qualified Domestic Relations Orders                           37
          9.  Military Service                                              37
         10.  Normal Retirement Age                                         37
         11.  Compensation Taken into Account                               37
         12.  No Decrease of Accrued Benefit                                38
         13.  Change to Vesting Schedule                                    38
         14.  Definitions                                                   38

                                      -iii-
<PAGE>

                          RETIREMENT AND SAVINGS PLAN

I.    PURPOSE

      The purpose of this Plan is to encourage and assist employees in following
      a systematic savings program suited to their individual financial
      objectives. This Plan is a profit-sharing plan.

II.   PARTICIPATION

      An employee shall become a Participant as of the first day of the month
      following the month in which occurs the date on which the employee has
      been compensated with respect to 1000 Hours of Service during a
      12-consecutive-month period (whether or not that period has ended). To
      determine Hours of Service, an employee for whom a record of Hours of
      Service is not kept shall be credited with 190 Hours of Service for each
      month of employment during which he is paid for one or more Hour. The
      first 12-consecutive- month period for purposes of this Section will
      commence on the employee's date of employment or reemployment, whichever
      is applicable. Subsequent periods shall be the Plan Years commencing
      during or after the first period.

      In addition, any employee who was an employee of E. I. duPont de Nemours
      and Company or Pioneer Hi-Bred International, Inc. or a member of the
      Controlled Group of either of those corporations on December 31, 1997 and
      who became an employee of the Company on or after January 1, 1998 and on
      or before June 1, 1998, is a Participant in this Plan effective as of the
      first day of the month coinciding with or next following the date he or
      she became an employee of the Company. The Company will be responsible for
      tracking eligibility of Participants under this paragraph.

      Once an employee is eligible to participate in the Plan, he remains
      eligible.

III.  ENROLLMENT

      An employee may enroll for making contributions to the Plan at any time on
      or after the date he becomes a Participant under Section II by authorizing
      deductions from his salary or wages or electing deferrals of compensation
      or both under the provisions of this Plan, subject to any deadlines or
      election periods the Company may establish from time to time. However, the
      effective date of any employee's participation in the Plan shall be the
      first day of the month specified in Section II whether or not the employee
      enrolls to make contributions as of that date.

IV.   AFTER-TAX AND BEFORE TAX-AMOUNTS

      1.    Amount of After-Tax and Before-Tax Contributions

            (a)   After-Tax and Before Tax Contributions

                  An individual may authorize his employer to (A) make a payroll
                  deduction (hereafter, After-Tax Contribution) and/or (B) defer
                  a portion of his compensation (hereafter, Before-Tax
                  Contribution) and pay it under this Plan in an amount per
                  month, and in the case of any

<PAGE>

                  applicable Variable Pay, at the time of such payment, equal to
                  any selected whole percentage (except as required to comply
                  with subparagraph (iii) below), from 1% to 16%, of his Monthly
                  Pay and any such Variable Pay, provided that (i) the sum of a
                  Participant's After-Tax Contributions and Before-Tax
                  Contributions may not exceed 16% of his Monthly Pay and any
                  applicable Variable Pay, (ii) during a period when Company
                  Contributions are suspended in accordance with Section XIV, XV
                  or XVI of the Plan, the Participant's After-Tax rate will be
                  limited to 10% (which limit will be monitored by the Company)
                  and (iii) a Participant may not defer Before-Tax Contributions
                  of more than $10,000 per year (or such other amount as may be
                  allowable in accordance with applicable statute, regulations
                  or official announcements made by the Secretary of the
                  Treasury). If a Participant's Before-Tax Contributions for a
                  Plan Year would exceed the limit in subparagraph (iii), above,
                  and if the Participant so elects, any contributions elected by
                  the Participant in excess of said limit shall be treated as
                  After-Tax Contributions. The Company will notify the
                  Participant of recharacterized contributions and will send the
                  contributions to the recordkeeper identified as After-Tax
                  Contributions.

            (b)   Reduction of After-Tax and/or Before-Tax Percentage

                  (1)   If the Plan Administrator estimates that the
                        discrimination standards of Code Sections 401(k) and/or
                        401(m) and the regulations thereunder may not be
                        satisfied, the selected Before-Tax Contribution,
                        After-Tax Contribution and/or Matching Contribution
                        portion of Company Contributions, as appropriate,
                        percentage for Highly Compensated Participants may be
                        reduced in 1% increments from 16% until the Plan
                        Administrator determines that the standards will be
                        satisfied. The Plan Administrator will be responsible
                        for communicating any reduction in the percentages to
                        the Participants.

                  (2)   If the Participant is eligible for a 9% Profit Sharing
                        Contribution under Section V, "13%" shall be substituted
                        for "16%" in this Section IV. The Company will track
                        these percentages and transmit the appropriate
                        contribution amounts to the recordkeeper.

            (c)   The Plan Administrator may determine during the Plan Year,
                  using information supplied by the recordkeeper, whether the
                  Before-Tax and Regular Account Contributions elected by Highly
                  Compensated Participants will, based on projections to the end
                  of the Plan Year, cause the Plan not to comply with the
                  limitations on contributions imposed by sections 401(k) and
                  401(m) of the Code. Such projections will be made by assuming
                  constant compensation and constant elected contribution
                  percentages. If the projections indicate that the limitations
                  will be exceeded, the Plan Administrator may instruct the
                  recordkeeper to adjust contributions by Highly Compensated
                  Participants as appropriate to implement the following:

                                      -2-
<PAGE>

                  (1)   The Plan Administrator will determine the maximum
                        percentages of Before Tax and Regular Account
                        Contributions respectively that can be made by Highly
                        Compensated Participants for the following month or
                        months without causing the Plan, on a projected basis,
                        to exceed such limitations ("Allowable Percentages").
                        Reductions in the Allowable Percentages, if any,
                        determined for this purpose will be made in 1%
                        increments and will be applied uniformly to all Highly
                        Compensated Participants.

                  (2)   The Plan Administrator will direct the recordkeeper to
                        reduce or adjust the percentages of Before Tax and
                        Regular Account Contributions of each Participant to
                        reflect the Allowable Percentages.

            (d)   If it is determined after the close of a Plan Year that
                  participation by Highly Compensated Participants has exceeded
                  the discrimination standards of Code sections 401(k) ("Excess
                  Contributions") or 401(m) ("Excess Aggregate Contributions"),
                  the amount of the Excess Contributions or the Excess Aggregate
                  Contributions shall be refunded to the Highly Compensated
                  Participants in accordance with the following rules:

                  (1)   Determination of the amount of Excess Contributions for
                        a Highly Compensated Participant shall be made in the
                        following manner: First, the Before-Tax Contributions of
                        the Highly Compensated Participant with the highest
                        dollar amount of such contributions will be reduced to
                        the extent necessary to satisfy the actual deferral
                        percentage ("ADP") test or cause such amount to equal
                        the dollar amount of the Highly Compensated Participant
                        with the next highest dollar amount. This process shall
                        be repeated until the ADP test is satisfied. The amount
                        of Excess Contributions for a Highly Compensated
                        Participant will be equal to the total dollar amount of
                        elective contributions that were reduced in order to
                        satisfy the ADP test. The reductions under this
                        paragraph shall be made in accordance with the
                        methodology prescribed in IRS Notice 97-2 or other
                        applicable notices or Treasury regulations.

                  (2)   Determination of the amount of Excess Aggregate
                        Contributions for a Highly Compensated Participant shall
                        be determined in the same manner as described in
                        Paragraph (1), above, ("Leveling") but substituting "ACP
                        test" for "ADP test".

                  (3)   For purposes of applying this Paragraph (d), the ADP and
                        ACP of Participants who are not Highly Compensated
                        Participants that are used in applying the ADP test and
                        ACP test for a particular Plan Year shall be the
                        percentages determined for the previous Plan Year.
                        However, the ADP and ACP for said

                                      -3-
<PAGE>

                        group of Participants for 1998 shall be the greater of
                        3% or the actual ADP and ACP of said group for 1998.

                  (4)   The amount of Excess Contributions to be distributed
                        shall be reduced by deferrals in excess of Code section
                        402(g) limits ("Excess Deferrals") previously
                        distributed for the taxable year ending in the same Plan
                        Year, and Excess Deferrals to be distributed for a
                        taxable year will be reduced by Excess Contributions
                        previously distributed for the Plan Year beginning in
                        such taxable year.

                  (5)   Distribution (or forfeiture, if applicable) of Excess
                        Aggregate Contributions or of Excess Contributions will
                        include the income allocable thereto. The income
                        allocable to the Excess Aggregate Contributions or
                        Excess Contributions includes income for the Plan Year
                        for which the Excess Aggregate Contributions or Excess
                        Contributions were made but does not include income for
                        the period between the end of the Plan Year and the date
                        of distribution (or forfeiture).

                  (6)   If a distribution of Excess Aggregate Contributions or
                        Excess Contributions results in a distribution of
                        Matched After-Tax or Before-Tax Contributions, the
                        Matching Contributions which relate to such Matched
                        Contributions must be distributed or forfeited, as
                        applicable.

                  (7)   A distribution of Excess Aggregate Contributions or
                        Excess Contributions shall be made within 2-1/2 months
                        of the end of the Plan Year in which they were made.

            (e)   If one or more Highly Compensated Employees is a Participant
                  in both the portion of this Plan subject to the ACP test and
                  that which is subject to the ADP test, then the tests shall be
                  applied in such a way as to avoid multiple use of the
                  alternative limitation in accordance with Treasury regulations
                  1.401(m)-2 and section 401(m)(9) of the Code.

                  If there is an impermissible multiple use of the alternative
                  limitation, the Plan Administrator shall reduce the ACP,
                  treating the reduction as an excess aggregate contribution, or
                  the ADP, treating the reduction as an excess contribution, to
                  the extent necessary to eliminate the impermissible multiple
                  use in accordance with applicable regulations and IRS Notices.

            (f)   Distribution of Excess Before-Tax Contribution

                  (1)   If the Plan Administrator determines that a Participant
                        has made a contribution under Paragraph l(a) of this
                        Section which for any calendar year exceeds $10,000 (or
                        such other amount as may be permitted by regulation or
                        other official announcement by the Secretary of
                        Treasury), the excess amount (plus any income and minus
                        any loss allocable thereto,

                                      -4-
<PAGE>

                        as calculated in accordance with regulations), shall be
                        distributed to the Participant not later than April 15th
                        following the close of such calendar year.

                  (2)   If a Participant participates in another plan which
                        includes a qualified cash or deferred arrangement, and
                        such Participant contributes in the aggregate more than
                        the exclusion limit under Paragraph 1(a) of this Section
                        and the corresponding provisions of the other plan and
                        the Participant notifies the Plan Administrator not
                        later than March 1st following the close of such
                        calendar year, then the Plan Administrator shall
                        distribute to the Participant not later than April 15th
                        following the close of such calendar year the excess
                        amount (plus any income and minus any loss allocable to
                        such amount) which the Participant allocated to this
                        Plan.

      2.    Change in Amounts of After-Tax and Before-Tax Contributions

            A Participant may change his After-Tax and Before-Tax Contribution
            amounts by authorizing the Company to deduct or defer any higher or
            lower amount permitted by Paragraph 1 of this Section.

      3.    Collection of After-Tax Contributions

            After-Tax Contributions shall be permitted only by deduction from a
            Participant's salary, wages, or Variable Pay.

      4.    Voluntary Suspension of After-Tax and Before-Tax Contributions

            A Participant who has an account balance in the Plan may authorize
            suspension of his After-Tax and Before-Tax Contributions without
            terminating his participation in the Plan. During such suspension,
            the related Matching Contribution described in Section V shall also
            be suspended. After a minimum suspension of one month, the
            Participant may authorize the resumption of After-Tax and/or Before-
            Tax Contributions. A Participant is not permitted to make up
            suspended After-Tax Contributions or Before-Tax Contributions.

V.    COMPANY CONTRIBUTIONS

      The Company will contribute amounts (hereafter, Company Contributions) as
      follows:

      1.    Matching Contributions

            Except to the extent limited during a period of suspension in
            accordance with Section IV.4, XIV, XV or XVI, the Company will
            contribute monthly, and in the case of Variable Pay at the time of
            such payment, to the Funds selected by each Participant in
            accordance with Paragraph 3 of Section VII an amount equal to 50% of
            the Participant's After-Tax and Before-Tax Contributions during that
            month and, if applicable, at the time of payment of any Variable Pay
            except that no such contribution will be made on the total of any
            Participant's After-Tax and Before-Tax Contributions in excess of 6%
            of his

                                      -5-
<PAGE>

            combined Monthly Pay and any applicable Variable Pay. For purposes
            of determining whether a Participant's After-Tax or Before-Tax
            Contributions are matched or unmatched, the Matching Contribution
            will be deemed to have first matched the Before-Tax Contributions.

      2.    Profit Sharing Contributions

            The Company will contribute monthly for each eligible Participant an
            amount equal to a percent of the Participant's Monthly Pay and any
            applicable Variable Pay paid during that month, subject to the
            following:

            (a)   In order to be eligible to receive a Profit Sharing
                  Contribution for a particular month, the employee must have
                  become a Participant pursuant to Section II on or before the
                  first day of that month.

            (b)   For purposes of this Subsection, compensation paid for
                  services prior to the date the employee becomes a Participant
                  shall be disregarded.

            (c)   The percent to be contributed for a Plan Year for an eligible
                  Participant shall be determined as follows:

                  (1)   If (i) the Participant became an employee of the Company
                        on or after January 1, 1998 and on or before June 1,
                        1998, (ii) the Participant was an employee of E. I. du
                        Pont de Nemours and Company, Pioneer Hi-Bred
                        International, Inc., or a member of the Controlled Group
                        of either of said corporations on December 31, 1997, and
                        (iii) the sum of the Participant's age (rounded to the
                        nearest whole year) and credited service under the
                        applicable defined benefit pension plan of said
                        corporations (rounded to the nearest whole year) on
                        December 31, 1997 equaled or exceeded 55, the percent
                        shall be 9%.

                  (2)   In any other case, the percent shall be 6%.

                  In each case, the contribution will be calculated by the
                  Company and transmitted to the recordkeeper.

      3.    The Company Contributions shall be for the exclusive benefit of
            Participants.

VI.   INVESTMENT FUNDS

      The following Funds shall be established for the investment of After-Tax,
      Before-Tax, and Company Contributions.

      1.    Fund A - Reserved (Hold for possible future use)

      2.    Fund B - Fixed Income

            Amounts deposited in the Fixed Income Fund shall be invested so as
            to preserve principal and to pay a stable rate of return over time.

                                      -6-
<PAGE>

      3.    Fund C - Mutual Funds and Other Investments

            Amounts deposited in Fund C shall be invested, as directed by
            Participants, in one or more mutual funds or other investment
            vehicles designated by the Company. The Company may in its sole
            discretion add investment options, merge options, or delete existing
            investment options at any time.

      4.    Fund D - DuPont Common Stock

            Amounts deposited in Fund D shall be invested in common stock of
            E.I. du Pont de Nemours and Company (hereafter "DuPont").

      5.    Fund L - Loans

            Amounts transferred to Fund L from the other Funds shall be loaned
            to Participants.

      6.    Fund F - Conoco Class B Stock

            Effective May 1, 1999, amounts deposited in Fund F shall be invested
            in shares of Class B stock of Conoco Inc.; provided, however, that
            Fund F shall be offered as an investment fund in the Plan only upon
            the effective date of the one-time initial tender offer of Class B
            stock of Conoco Inc., and no amounts may be invested in Fund F other
            than as a result of such initial tender offer. If the tender offer
            does not occur, this Paragraph 6 shall not become effective.
            Notwithstanding any other provision of this Plan to the contrary, an
            accountholder may authorize the transfer of all or part of the value
            of his account invested in Fund F into any other investment fund
            available under the Plan, but may not authorize any transfer into
            Fund F other than as a result of the tender offer. Fund F shall be
            treated as an investment fund other than Fund L for determining
            availability of loans and withdrawals and for all other purposes as
            appropriate under this Plan.

      7.    Fund P - Pioneer Common Stock

            Effective January 1, 1999, amounts deposited in Fund P shall be
            invested in common stock of Pioneer Hi-Bred International, Inc.
            (hereafter "Pioneer"). Effective October 1, 1999, Fund P is
            discontinued and all references in the Plan to Fund P shall
            thereafter be disregarded.

VII.  INVESTMENT DIRECTION

      1.    Investment of After-Tax Contributions

            Each Participant shall authorize the Company to allocate his
            After-Tax Contributions to his Regular Account in Funds B, C, D or P
            in selected percentages in whole multiples of one percent (1%).

                                      -7-
<PAGE>

      2.    Investment of Before-Tax Contributions

            Each Participant shall authorize the Company to allocate his
            Before-Tax Contributions to his Before-Tax Account in Funds B, C, D
            or P in selected percentages in whole multiples of one percent (1%).

      3.    Investment of Company Contribution

            Each Participant shall authorize the Company to allocate Company
            Contributions to his Regular Account in accordance with the
            Participant's current investment direction of After-Tax
            Contributions. An After-Tax investment direction will be required
            upon enrollment in the Plan.

      4.    Change in Investment Direction

            A Participant may change his investment direction to Funds B, C, D
            or P by authorizing any other allocation permitted by Paragraphs 1
            and 2 of this Section.

      5.    Separate Accounting and Nonforfeitability

            A Participant's Before-Tax Contributions and After-Tax Contributions
            and earnings thereon will be nonforfeitable. A Participant's
            Before-Tax Account will be maintained in a separate account from a
            Participant's After-Tax Contributions, Company Contributions and
            earnings thereon.

      6.    Contributions generally shall be invested pursuant to the
            Participant's directions as soon as administratively feasible
            following receipt by the Trustee. However, the Company may provide
            for temporary delays in investment of contributions to the extent
            the Company determines in its sole discretion to be necessary or
            appropriate for the administration of the Plan. During any such
            temporary delay, the amounts may be held uninvested, or may be
            invested in a money market fund or similar short-term investment, in
            which case any temporary earnings on such contributions may be
            allocated to the Accounts of Participants in such manner as the
            Trustee deems appropriate, or may be applied to pay expenses of
            administering the Plan.

VIII. FUND TRANSFERS

      1.    Transfers Among Funds B, C, D and P

            An account holder, other than a non-Spouse Beneficiary, may
            authorize the transfer of all or part of the value of his Regular
            Account in Fund B, C, D or P or his Before-Tax Account in Fund B, C,
            D or P from one Fund to the other. Such Transfers may be made in any
            whole multiple of 1% or in any number of Fund Units and/or Shares.
            Amounts may not be transferred into and out of the same Fund on the
            same business day. The determination of values for this purpose
            shall be made in accordance with the provisions of Sections IX, X
            and XI.

                                      -8-
<PAGE>

      2.    Transfers to Fund L from Funds B, C, D, F and P

            A Participant who is granted a loan or loans from the Plan shall
            designate the sequence in which Funds will be liquidated and
            authorize the Transfer of cash to Fund L in an amount equal to the
            principal amount of the loan or loans. Such Transfers shall be made
            from the Participant's borrowable account balance in the following
            order:

            (a)   Rollover Contributions and Earnings.

            (b)   Nonforfeitable Profit Sharing Contributions and Earnings.

            (c)   Nonforfeitable Matching Contributions based on After-Tax
                  Contributions and Earnings.

            (d)   Norforfeitable Matching Contributions based on Before-Tax
                  Contributions and Earnings.

            (e)   Unmatched After-Tax Contributions and Earnings.

            (f)   Matched After-Tax Contributions and Earnings.

            (g)   Pre-'87 After-Tax Contributions and Earnings.

            (h)   Unmatched Before-Tax Contributions and Earnings.

            (i)   Matched Before-Tax Contributions and Earnings.

      3.    Transfers to Funds B, C, D and P from Fund L

            Repayments of principal and interest to Fund L shall be transferred
            to Funds B, C, D and/or P in the Before-Tax Account, or Funds B, C,
            D and/or P in the Regular Account. Such Transfers shall be made in
            the same proportion that current investment direction of After-Tax
            and/or Before-Tax Contributions are made to those Funds under
            Sections VII.1 and 2. If there is no current investment direction
            for Contributions, Transfers under this Paragraph shall be made to
            Fund B. Repayments of principal under this Paragraph shall be
            restored to the Participant's Regular and/or Before-Tax Account in
            reverse order from that set forth in Paragraph 2 of this Section.
            Payments of interest shall be treated as Earnings and shall be
            allocated to the Regular and/or Before-Tax Account in the same
            proportion that unpaid principal from each Account bears to the
            total unpaid principal prior to such payment.

IX.   [Reserved]

                                      -9-
<PAGE>

X.    OPERATION OF FUNDS B AND C

      Throughout this Section, the words "the Fund" shall mean Fund B or Fund C.

      1.    Fund Investments

            (a)   Amounts allocated to the Fund(s) in accordance with the terms
                  of this Plan shall be paid by the Company to or at the
                  direction of Trustee(s) appointed by the Company for the
                  Fund(s), and shall be deposited in an account for the Fund(s).

            (b)   Amounts deposited in the Fixed Income Fund shall be delivered
                  to the Trustee and invested as designated by the Company
                  pursuant to arrangements with one or more entities chosen by
                  the Company, including, but not limited to, insurance
                  companies, banks and other investment organizations. These
                  arrangements shall provide for the return of principal in full
                  plus the payment of interest at a predetermined rate
                  applicable for a specified period of time. In addition, a
                  portion of the Fixed Income Fund shall be invested in a
                  short-term funds(s) (i.e., a cash buffer) so as to provide
                  sufficient liquidity to accommodate daily trading activity.

            (c)   All amounts received by the Trustee of Fund C shall be
                  invested, as directed by account holders, in one or more
                  mutual funds or other investment vehicles designated by the
                  Company. Assets of Fund C shall be held in the name of the
                  Trustee(s) or one or more of its/their designated nominees.

      2.    Fund Valuation

            (a)   All deposits to the Fixed Income Fund shall be expressed as
                  units of participation in the Fixed Income Fund. The Trustee
                  of the Fixed Income Fund shall determine each day's unit value
                  based on the assets of the Fixed Income Fund. Assets shall
                  consist of all deposits to the Fixed Income Fund and all
                  interest credited or accrued to such deposits pursuant to
                  investment arrangements. No participant in the Fixed Income
                  Fund shall have ownership in any particular investment in the
                  Fixed Income Fund.

            (b)   The Trustee(s) of Fund C shall determine the current fair
                  market value of all assets held by such Fund, including
                  accrued income, each day on which business is transacted on
                  the New York Stock Exchange.

            (c)   Fund valuations determined in accordance with Paragraphs 2(a)
                  and 2(b) of this Section shall be made before recording in the
                  Fund After-Tax Contributions, Before-Tax Contributions,
                  Company Contributions, Withdrawals, Terminations of
                  Participation, and Transfers among Funds.

                                      -10-
<PAGE>

      3.    Fund Units or Shares

            (a)   Amounts allocated to the Fund(s) shall be credited to account
                  holder's accounts in dollars, in shares, and/or in units, as
                  appropriate, of ownership in the Fund(s).

                  (1)   The value of a unit or share shall be determined as
                        follows:

                        (i)   The value of a unit in Fund B shall be determined
                              by dividing the total value of the Fund for that
                              business day by the corresponding total number of
                              units in the Fund before adding or subtracting any
                              units for that business day.

                        (ii)  The value of each mutual fund share or other
                              investment in Fund C shall be determined on each
                              business day by the Investment Manager(s) of Fund
                              C.

                  (2)   The number of units or shares credited to each account
                        holder's account for the current business day shall be
                        determined by dividing the amounts of the account
                        holder's After-Tax Contributions, Before-Tax
                        Contributions, Company Contributions, and/or Transfers
                        among Funds for the current business day by the value of
                        one unit or share for that day.

            (b)   The current value of an account holder's account in the Fund,
                  as needed for Withdrawals, Termination of Participation,
                  Loans, Transfers among Funds, or periodic reports to account
                  holders, shall be determined by multiplying the total number
                  of his respective Units and/or shares in the Fund (after
                  additions for the current day) by the value of one Unit and/or
                  share respectively for that business day; also, the number of
                  respective Units and/or shares to be deducted from an account
                  holder's account because of forfeiture, Loan, or Withdrawal of
                  a specified amount shall be determined by dividing such amount
                  by the value of one Unit and/or share respectively for that
                  day.

      4.    Voting of Shares

            Commencing October 1, 1998, each accountholder shall be entitled to
            direct the Trustee as to the manner in which voting rights with
            respect to the shares or units represented by the accountholder's
            Account in Fund B or C are to be exercised. The Trustee shall vote
            the number of shares or units in accordance with such instructions.
            If a Participant does not return proper voting instructions in a
            timely manner, such inaction shall be deemed an election not to vote
            such shares or to vote such shares as the default option described
            on the proxy or voting instruction, as applicable.

      5.    For purposes of allocating income and losses with respect to Fund C,
            each mutual fund or other investment option under Fund C shall be
            treated as if it were a separate "Fund".

                                      -11-
<PAGE>

XI.   OPERATION OF FUNDS D AND P

      1.    Purchase of DuPont Common Stock

            Amounts allocated to Fund D shall be used to purchase DuPont common
            stock. Such purchases may be made in the open market or from DuPont
            if it shall have made treasury or authorized but unissued shares
            available for such purchases. In the case of stock purchased from
            DuPont, the purchase price shall be the closing price of such stock
            as reported on the New York Stock Exchange - Composite Transactions
            on the last trading day preceding the date of such purchase from
            DuPont. Purchases made on the open market shall be the average price
            for all shares purchased by the Plan during that day. Such DuPont
            common stock and any other assets of Fund D shall be held in the
            name of the Trustee or of one or more of its designated nominees.
            The Trustee may sell any stock purchase warrants or distribution of
            property received, and the proceeds shall be invested currently in
            DuPont common stock. Any stock dividend, split-up or other change in
            DuPont common stock, or any distributions of property applicable to
            the shares held by the Trustee, shall be applied for the exclusive
            benefit of the account holders in Fund D.

      2.    Account Holder's Account

            (a)   Amounts allocated to an account holder's Fund D shall be
                  credited in dollars and in a proportionate number of full
                  shares and fractional interests in a share of DuPont common
                  stock. Such proportionate number shall be determined on the
                  basis of the ratio of the amount allocated to his account to
                  the total of all amounts allocated to Fund D for the business
                  day.

            (b)   An account holder shall be credited with a proportionate
                  number of full shares and fractional interests in a share of
                  any DuPont common stock acquired by the Trustee with income
                  accruing to Fund D, or as a result of any addition due to
                  stock dividends, stock purchase warrant, split-up or other
                  change, or distribution of property applicable to such stock.
                  Such proportionate number shall be determined on the basis of
                  the ratio of his total shares to the total of all shares in
                  Fund D to which such income or addition applies. In the event
                  an account holder has transferred all funds out of Fund D
                  prior to payment of a stock dividend, stock purchase warrant,
                  split-up or other change, or distribution of property
                  applicable to stock held in Fund D, the full shares or
                  fractional interests in a share, if any, allocable to such
                  transferred funds on account of such stock purchase, warrant,
                  split-up or other change, or distribution or property shall be
                  paid in cash in accordance with the account holder's current
                  investment direction.

3.    Valuation of Fund D

      (a)   Valuation: Account Status

            The current value of an account in the Fund on any business day
            shall be the total number of shares and fractional interests in a
            share in the

                                      -12-
<PAGE>

            account multiplied by the closing price of DuPont common stock on
            the New York Stock Exchange for that business day, plus any
            proportionate ownership of accrued income and cash held for an
            account holder by the Trustee for Fund D.

      (b)   Valuation: Fund Transfers Out, Loans, Withdrawals and Termination or
            Other Distributions

            For purposes of Fund Transfers Out, Loans, Withdrawals and
            Termination or Other Distributions, the value of shares liquidated
            in connection with the transaction shall be the average selling
            price as determined by the Trustee on the date of the transaction.

      (c)   Valuation: Fund Transfers In and Purchases of DuPont Common Stock.

            For purpose of Fund Transfers In and Purchases of DuPont
            Common Stock, the value of the DuPont common stock purchased
            in connection with the transaction shall be the average
            purchase price as determined by the Trustee on the date of the
            transaction.

4.    Voting and Tender of Shares

      Commencing October 1, 1998:

      (a)   Each accountholder shall be entitled to direct the Trustee as to the
            manner in which voting rights with respect to any DuPont stock
            attributable to the number of shares and fractional interest in a
            share represented by the accountholder's account in Fund D are to be
            exercised. The Trustee shall vote the number of shares in accordance
            with such instructions. Any such instructions shall remain in the
            strict confidence of the Trustee.

      (b)   Each accountholder shall be entitled to direct the Trustee as to
            whether to exercise a tender offer with respect to any DuPont stock
            credited to such accountholder's account in Fund D. The Trustee
            shall tender such shares in accordance with such instructions. If an
            accountholder does not return proper tender instructions to the
            Trustee in a timely manner, such inaction by the accountholder shall
            be deemed a decision not to tender, and the Trustee shall not tender
            shares credited to such accountholder's account.

5.    Operation of Fund P

      Prior to October 1, 1999, Fund P shall be operated in accordance with the
      provisions of Paragraphs 1 through 4 of this Section XI, with "Fund P"
      substituted for "Fund D" and "Pioneer" substituted for "DuPont" each
      place such terms appear in those paragraphs. Effective October 1, 1999,
      any portion of an accountholder's accounts invested in Fund P which the
      accountholder has elected to exchange for DuPont stock or which has been
      converted to DuPont

                                      -13-
<PAGE>

            stock due to proration rules shall be transferred to Fund D and the
            remainder of the accountholder's accounts invested in Fund P shall
            be transferred to Fund B.

XII.  OPERATION OF FUND L

      1.    Establishment of Loan Account

            Amounts transferred to this Fund shall be loaned to the Participant
            provided the procedures described in Section XIII.8(d) have been
            completed. The Participant's obligation to repay the loan pursuant
            to the documents constituting the promissory note shall be held by a
            Trustee appointed by the Company for the Fund until the loan has
            been paid in full.

      2.    Interest

            Interest at the rate prescribed in the loan agreement shall accrue
            daily.

      3.    Repayments

            The Administrator shall reduce the account balance in Fund L to
            reflect repayments of principal and interest, and such amounts shall
            be transferred to the Participant's Account(s) as provided in
            Section VIII.3. When the account balance in Fund L has been reduced
            to zero, the Administrator shall notify the Trustee that the loan
            has been repaid and the Trustee shall cancel the records of the
            Participant's obligation to repay that constitute the Participant's
            promissory note.

      4.    Fund Valuation

            The current value of the account on any date shall be the
            outstanding loan balance plus any unpaid accrued interest.

XIII. PARTICIPANT LOANS

      A Participant with a borrowable account balance in Funds B, C, D, F and P
      of $1,000 or more may request a loan subject to the conditions stated in
      this Section (hereafter, Loan).

      1.    Determination of Borrowable Account Balance

            For purposes of this Section and Section VIII, the borrowable
            account balance in Funds B, C, D, F and P shall equal one-half of
            (i) the amount distributable from those Funds under Section XVI on
            account of termination of employment from the Controlled Group for
            any reason other than those described in Section XVI.2(b), less (ii)
            amounts held pursuant to a qualified domestic relations order, with
            the result reduced by the outstanding balance of any loan to the
            Participant.

                                      -14-
<PAGE>

      2.    Amount of Loan

            Loans shall not be for less than $1,000. The maximum amount of any
            Loan from this Plan may not exceed the Participant's borrowable
            account balance in Funds B, C, D, F and P and, when added to the
            outstanding balance(s) of all other loans from this or any other
            qualified plans sponsored by any member of the Controlled Group,
            shall not exceed the lesser of:

            (a)   $50,000, reduced by the highest outstanding balance of Loans
                  from the Controlled Group profit sharing plans during the one-
                  year period ending on the day before the date on which such
                  Loan was made, or

            (b)   one-half of the Participant's nonforfeitable account
                  balance(s) in all Controlled Group profit-sharing plans.

      3.    Interest

            The rate of interest for Loans granted during any monthly period
            shall be determined as of the last working day of the month
            preceding the date on which the Loan application is made and shall
            be the average rate for secured personal loans (rounded to the next
            lower one-quarter percent (1/4%) then in effect at five banks
            selected by the Plan Administrator; provided however, that the
            interest rate shall not exceed the maximum amount allowed by law.

      4.    Term of Loans

            The term of the Loan shall be the period requested by the
            Participant and accepted by the Administrator. The minimum term
            shall be 12 months and the maximum term 60 months, except for a
            qualified residential Loan. The maximum term for a qualified
            residential Loan shall be 120 months. The Administrator shall
            determine, based on information furnished by the Participant,
            whether a Loan is a qualified residential Loan, as defined in
            Paragraph 8(e) of this Section.

      5.    Repayment

            (a)   Payroll Deduction

                  Except as provided in Subparagraph (b) below, Loans shall be
                  repaid in monthly installments by deduction from a
                  Participant's salary or wages according to the amortization
                  schedule in the disclosure statement.

                  Notwithstanding the foregoing, a Participant shall have the
                  right to repay at any time prior to the expiration of the term
                  of the Loan, without penalty, the outstanding balance of the
                  Loan plus accrued interest to the end of the month in which
                  repayment occurs. Such payment shall be made in such form as
                  permitted by the Administrator, or by an election on the part
                  of the Participant to incur a Deemed Withdrawal from his
                  account pursuant to Paragraph 7(a) of this Section.

                                      -15-
<PAGE>

                  If the Participant's salary or wage payment is not sufficient
                  to allow deduction of the full installment and the Participant
                  does not make a direct payment, as provided in Paragraph 5(b)
                  of this Section, on or before the 45th day following the day
                  on which such payment was due, a default will be declared
                  under Paragraph 6(a) of this Section.

            (b)   Direct Payment

                  The Administrator, at the Participant's request, may permit
                  installments of principal and interest to be repaid in a
                  manner other than by payroll deduction under the following
                  circumstances:

                  (1)   the Participant, at Company request, is transferred to
                        E. I. du Pont de Nemours and Company, Pioneer Hi-Bred
                        International, Inc. or a member of the Controlled Group
                        of either of said corporations, is transferred to an
                        Affiliated Group company or is employed by a partnership
                        or joint venture in which the Company has an ownership
                        interest, and does not elect under Section XIX.5(b) to
                        transfer his account to the qualified profit-sharing
                        plan of the company, partnership or joint venture to
                        which he is transferred or employed, or

                  (2)   the Participant is granted a leave of absence without
                        pay, or

                  (3)   the Participant's salary or wage payment is not
                        sufficient to allow deduction of the full installment
                        payment.

      6.    Declaration and Notice of Default

            If, for any of the reasons described in this Paragraph, a Loan is
            declared in default, the Loan Administrator shall issue a Notice of
            Default which shall be delivered to the Participant.

            (a)   Nonpayment

                  If, while any portion of a Loan granted under this Section is
                  outstanding, the Participant fails to make a scheduled
                  repayment or a direct payment as provided in Paragraphs 5(a)
                  and (b) of this Section, respectively, on or before the 45th
                  day following the day on which such payment was due, the Loan
                  shall be declared in default.

            (b)   Termination of Employment

                  If a Participant terminates employment for any reason, other
                  than on account of death or a transfer described in Paragraph
                  5(b)(1), and does not elect to defer distribution of the
                  balance of his accounts under Section XVI.4(e), a Deemed
                  Withdrawal shall occur as of the last day of the month within
                  which the Participant terminates employment. In the event of
                  death, notwithstanding Sec. XII.2, the accrual of interest
                  shall cease as of the last day of the month in which death
                  occurs and a Deemed Withdrawal shall occur as of the date on
                  which distribution of

                                      -16-
<PAGE>

                  the balance of the Participant's accounts is made under Sec.
                  XVI.4(d) unless an election is made under Sec. XVI.4(e) in
                  which case a Deemed Withdrawal shall occur as of the last day
                  of the month in which such election is made.

            (c)   Transfers to Another Employer

                  If a Participant is, at Company request, transferred to an
                  employer described in Paragraph 5(b)(1), and does not make an
                  election under Section XIX.5(b), or the Trustee of the
                  receiving plan will not accept transfer of the Fund L account,
                  a Deemed Withdrawal shall occur as of the last day of the
                  month within which the Participant terminates employment from
                  such employer.

            (d)   Reinstatement of Loan

                  The Plan Administrator may reinstate a Loan following a
                  declaration of default, provided:

                  (1)   all payments of principal and interest in arrears are
                        received by the Plan Administrator prior to a Deemed
                        Withdrawal under Paragraph 7 of this Section; and

                  (2)   the Plan Administrator receives adequate assurance that
                        future installments will be received by Fund L on a
                        timely basis.

      7.    Deemed Withdrawal

            (a)   The balance of the Participant's Fund L account shall be
                  deemed to have been withdrawn from the Plan by the Participant
                  under Section XIV or XVI, whichever is applicable (Deemed
                  Withdrawal), under the following circumstances:

                  (1)   the Plan Administrator does not reinstate a Loan under
                        Section XIII.6(d) on the earlier of the date of
                        distribution of the Participant's Accounts or the 45th
                        day after a default for any reason set forth in Section
                        XIII.6, or

                  (2)   the Participant elects to repay his Loan by canceling
                        his Fund L account.

                  A Deemed Withdrawal initiated under Clause (1) or Clause (2)
                  above shall not be considered a withdrawal for purposes of the
                  limitation on the number of withdrawals permitted under
                  Section XIV.1.

            (b)   Notwithstanding the foregoing, no Deemed Withdrawal shall be
                  permitted if such withdrawal would adversely affect the status
                  of the Plan under Section 401(a) or 401(k) of the Code. The
                  Plan Administrator may take such action as it deems necessary
                  to insure repayment of Loans made under this Section and
                  compliance with applicable law. If a Deemed Withdrawal under
                  Section XIII.7(a) would

                                      -17-
<PAGE>

                  adversely affect the status of the Plan under Section 401(a)
                  or 401(k) of the Code:

                  (1)   the balance of the Participant's Regular Account in
                        Funds B, C, D, F and P shall be distributed subject to
                        Section XIV in accordance with the consent of the
                        Participant given at the time of the Loan initiation;

                  (2)   the Participant shall deposit neither After-Tax nor
                        Before- Tax Contributions during the period beginning
                        with the month following the month in which the notice
                        of default is issued and ending with the month in which
                        the Loan is reinstated under Section XIII.6(d); and

                  (3)   Company Contributions shall be suspended for a period
                        not to extend beyond the later of six months after the
                        month in which the notice of default is issued or the
                        end of the month in which the Loan is reinstated under
                        Section XIII.6(d).

      8.    General Conditions

            (a)   Any Participant may receive a Loan from the Plan. For purposes
                  only of the Loan program provided for herein, Participant
                  shall mean any "Party in Interest", as that term is defined in
                  Section 3(14) of the Employee Retirement Income Security Act
                  (ERISA) who has a borrowable account balance in the Plan of at
                  least $1,000, or to any person who has a vested account under
                  the Plan and who is employed by an Affiliated Company. For
                  purposes of this Article XIII, Affiliated Company shall mean a
                  corporation that has adopted the Plan or any other profit
                  sharing plan and is a member of the controlled group of
                  corporations (within the meaning of Section 1663(a) of the
                  Code, determined without regard to Code Section 1563(a)(4) and
                  Section 1563(e)(3)(c)) of which the Company is parent, and any
                  corporation which is not a member of the controlled group of
                  corporations but in which the Company has an ownership
                  interest, or which has an ownership interest in the Company or
                  is a member of the controlled group of a corporation which has
                  an ownership interest in the Company.

            (b)   A Participant may not have more than five Loans from the Plan
                  outstanding at any time.

            (c)   At all times during the term of the Loan(s), the Participant
                  must have a balance in Fund L equal to the outstanding balance
                  of the Loan(s).

            (d)   No Loan shall be made to any Participant until the following
                  steps are completed:

                  (1)   The Participant has initiated the loan by contacting the
                        recordkeeper pursuant to procedures established by the
                        recordkeeper.

                                      -18-
<PAGE>

                  (2)   The Participant has authorized payroll deductions for
                        loan repayments.

                  (3)   The Participant has authorized liquidation of assets to
                        fund the loan amount.

                  (4)   The Participant has provided any consent required by
                        Section XIII.7.(b)(1).

                  (5)   The check for the loan principal has been endorsed by
                        the Participant. The recordkeeper will issue a loan
                        check containing a conditional endorsement stating that
                        by endorsing the check, the Participant agrees to the
                        terms and conditions of the loan as set forth in the
                        security agreement, disclosure statement and promissory
                        note that accompanied the check.

            (e)   A "qualified residential Loan" is a Loan used to acquire or
                  construct any dwelling unit which within a reasonable time
                  (determined at the time the Loan is made) is to be used as a
                  principal residence of the Participant.

            (f)   All Participants granted Loans under this Section shall
                  receive a statement disclosing the terms of the Loan,
                  including the interest rate, amount of interest to be paid
                  over the term of the Loan and payment conditions (disclosure
                  statement).

            (g)   No Loan may be granted that would adversely affect the status
                  of the Plan as one which qualifies under Section 401(a) or
                  401(k) of the Code or the status of the trust as one which is
                  exempt from Federal income tax under Section 501(a) of the
                  Code.

            (h)   Notwithstanding anything above to the contrary, the Loan
                  Administrator may deny a Loan if in its judgment the
                  Participant will not have sufficient income to meet his Loan
                  payments as they become due.

            (i)   The Loan Administrator is responsible for the administration
                  of the loan program described in this section.

XIV.  WITHDRAWALS

      1.    General Conditions

            (a)   In addition to a distribution pursuant to Section XVI.1., a
                  Participant, Former Participant, Alternate Payee or Spouse
                  Beneficiary may make three withdrawals in any calendar year
                  under the provisions of this Section from his Regular and/or
                  Before-Tax Accounts. Withdrawals shall not be permitted:

                                      -19-
<PAGE>

                  (i)   from the Before-Tax Account before the Participant
                        attains age 59 1/2, becomes disabled, incurs a hardship,
                        or terminates employment with the Company's Controlled
                        Group. Hardship withdrawals from the Before-Tax Account
                        are governed by Section XV.

                  (ii)  from Fund L, except as provided in Section XIII.7.

                  (iii) from the portion of the Regular Account attributable to
                        Profit Sharing Contributions and Earnings on those
                        contributions prior to termination of employment with
                        the Controlled Group.

            (b)   Withdrawn amounts will be valued as of the valuation date on
                  which the transaction is processed.

            (c)   Matching Contributions shall be suspended for six months if a
                  Participant withdraws any or all of:

                  (i)   his Matched After-Tax Amounts deposited during the last
                        two years of participation;

                  (ii)  his Matched Before-Tax Amounts deposited during the last
                        two years of participation;

                  (iii) the Nonforfeitable Matching Contributions deposited in
                        his Regular Account during the last two years of
                        participation.

            (d)   Distribution from Regular Accounts and Before-Tax Accounts
                  under this Section may be made in cash or in kind as provided
                  in Section XVI.4(a) or XVI.4(b), whichever is applicable.

            (e)   The Funds in which the Participant's Accounts are invested
                  will be liquidated pro rata to provide for less than total
                  withdrawals.

      2.    Withdrawal Sequence

            Withdrawals by the Participant shall be made from his Regular
            Account in the following order:

            (a)   Pre-'87 After-Tax Contributions and Earnings.

            (b)   Unmatched After-Tax Contributions and Earnings.

            (c)   Rollover Contributions and Earnings.

            (d)   Matched After-Tax Contributions held for more than two years
                  and Earnings.

            (e)   Matched After-Tax Contributions made during the most recent
                  two years of participation and Earnings.

                                      -20-
<PAGE>

            (f)   Nonforfeitable Matching Contributions held for more than two
                  years and Earnings.

            (g)   Nonforfeitable Matching Contributions contributed during the
                  last two years of participation and Earnings.

            (h)   Nonforfeitable Profit Sharing Contributions and Earnings on
                  such contributions, following termination of employment with
                  the Controlled Group.

            Withdrawals by the Participant shall be made from his Before-Tax
            Account in the following order:

            (a)   Unmatched Before-Tax Contributions and Earnings.

            (b)   Matched Before-Tax Contributions held for more than two years
                  and Earnings.

            (c)   Matched Before-Tax Contributions contributed during the last
                  two years of participation and Earnings.

      3.    Withdrawal Maximums

            The maximum withdrawal from any category in Section XIV.2 above
            shall be the lesser of

            (a)   the amount in such category in the Participant's Fund(s), or

            (b)   the value of the Units, shares, and/or dollars, as
                  appropriate, attributable to such category in the
                  Participant's Fund(s) at the valuation date on which the
                  transaction is processed.

XV.   HARDSHIP WITHDRAWALS FROM BEFORE-TAX ACCOUNT

      1.    Definition of Hardship

            A Participant may make a withdrawal in cash from his Before-Tax
            Account by establishing hardship. In order to prove hardship, a
            Participant must show (1) that he has an immediate and heavy
            financial need; and (2) that the hardship distribution is necessary
            to satisfy the immediate and heavy financial need. A committee
            appointed by the Company shall act on requests for withdrawals and
            appeals under this Section. The amount of an immediate and heavy
            financial need may, at the participant's request, include any
            amounts necessary to pay any federal income taxes or penalties
            reasonably anticipated to result from the distribution.

      2.    Establishment of Immediate and Heavy Financial Need

            A Participant may establish the existence of an immediate and heavy
            financial need only by demonstrating that the need results from one
            of the following deemed hardship conditions:

                                      -21-
<PAGE>

            a.    Medical expenses described in Section 213(d) of the Internal
                  Revenue Code incurred or to be obtained by the Participant,
                  the Participant's spouse, or any dependents of the
                  Participant;

            b.    Purchase (excluding mortgage payments) of a principal
                  residence for the Participant;

            c.    Payment of tuition, related educational fees, and room and
                  board for the next 12 months of post-secondary education for
                  the Participant, the Participant's spouse, children or
                  dependents; or

            d.    The need to prevent the eviction of the Participant from his
                  principal residence or foreclosure on the mortgage of the
                  Participant's principal residence.

      3.    Distribution Necessary to Satisfy Immediate and Heavy Financial Need

            A Participant's request for a distribution to meet an immediate and
            heavy financial need will be deemed necessary to satisfy the need
            only if the Participant establishes in a sworn and notarized
            statement that:

            (a)   The distribution is not in excess of the amount of the
                  Participant's immediate and heavy financial need; and

            (b)   The Participant has obtained all distributions, other than
                  hardship distributions, and all loans currently available
                  under all plans maintained by the Controlled Group.

            The following consequences shall, in all events, apply:

            (i)   The Participant will be prohibited from making any Before-Tax
                  and After-Tax Contributions under this Plan and all other
                  plans, with the exception of health and welfare benefit plans,
                  including ones that are part of a cafeteria plan within the
                  meaning of Section 125 of the Code maintained by the
                  Controlled Group of companies for a period of twelve (12)
                  months after receipt of the hardship distribution; and

            (ii)  The Participant will be prohibited from making Before-Tax
                  Contributions under this Plan and all other plans maintained
                  by the Controlled Group of companies for the Participant's
                  taxable year immediately following the year of the hardship
                  distribution in excess of the applicable limit under Section
                  402(g) of the Internal Revenue Code for such next taxable year
                  less the amount of such Participant's Before-Tax Contributions
                  for the taxable year of the hardship distribution.

      4.    Amount Withdrawable

            The amount which may be withdrawn cannot exceed the total of the
            Participant's Before-Tax Contributions (nor the amount necessary to
            satisfy the

                                      -22-
<PAGE>

            immediate and heavy financial need created by the hardship). A
            Participant may direct withdrawals under this Section in accordance
            with Section XIV.1.(f). The withdrawal sequence will be as set
            forth in Section XIV.2.

      5.    Forfeitures and Suspensions

            Except as provided otherwise in this Section, Hardship Withdrawals
            are subject to the same suspensions provided in Section XIV for
            other withdrawals from Before-Tax Accounts, provided, however, that
            a Hardship Withdrawal shall not be considered a withdrawal for
            purposes of the limitation on the number of withdrawals permitted
            under Section XIV.1.

XVI.  TERMINATION OF PARTICIPATION

      1.    General Conditions

            (a)   An individual's participation in the Plan will end when his
                  service with the Company and its Controlled Group is
                  terminated or the Plan is terminated. In either such event,
                  notwithstanding the restriction on the number of withdrawals
                  contained in Section XIV.1, the Former Participant may
                  request distribution of the balance in his Accounts.
                  Distribution of the Participant's total interest in the Plan,
                  after deducting any required forfeiture of Company
                  Contributions, will be made as described in this Section.

            (b)   Notwithstanding Paragraph (a), distribution of the
                  individual's Before-Tax Account upon termination of the Plan
                  may be made as described in this Section only after he attains
                  age 59 1/2, becomes disabled, or terminates his service with
                  the Controlled Group, whichever occurs first. Any termination
                  on account of a liquidation, merger, or consolidation of the
                  Company, which involves (1) no substantial change in the
                  make-up of employees, (2) only a technical change in the
                  employment relationship, and (3) no meaningful change in the
                  beneficial ownership of the business will not be considered a
                  termination of service. Distribution of such Former
                  Participant's Regular Account will be made, after deducting
                  any required forfeiture of Company Contributions, when the
                  Plan or his service with the Company is terminated or, at his
                  option, when his Before-Tax Account is distributed. A Former
                  Participant who, prior to his termination of service, elected
                  to defer receipt of his Regular Account balance under this
                  Subparagraph may, at any time prior to settlement of his
                  accounts, request immediate distribution of the balance in his
                  Regular Account less any required forfeiture of Company
                  Contributions.

      2.    Terminations Without Forfeiture

            No forfeiture of Company Contributions will be charged against a
            Participant if termination of employment occurs:

            (a)   for any reason after the Participant attains Normal Retirement
                  Age or is credited with five Years of Vesting Service, or

                                      -23-
<PAGE>

            (b)   at any time by reason of:

                  (1)   termination on account of total and permanent disability
                        as determined under the Company's long term disability
                        plan that covered the Participant,

                  (2)   death prior to termination of employment, or

                  (3)   termination of the Plan.

                  (4)   termination of employment on or after April 20,1999 due
                        to a formal reduction in force program with respect to
                        which the Company has determined that the Participant's
                        employment role has been eliminated and his or her
                        employment is severed; provided, however, that this
                        Subparagraph (4) does not apply if the Participant's
                        employment is terminated for reasons determined by the
                        Company to be related to the Participant's performance.

      3.    Terminations With Forfeiture

            A Participant will forfeit the nonvested percent of the Company
            Contributions made for his Account if he has less than five Years of
            Vesting Service and he ceases to be an employee of the Company and
            its Controlled Group for any reason other than those specified in
            Paragraph 2(a) or (b) of this Section.

            (a)   The nonvested percent shall be determined from the following
                  table:

                  Years of Vesting Service      Nonvested Percent
                  ------------------------      -----------------

                  Less than 1                            100%
                  1 but less than 2                       80%
                  2 but less than 3                       60%
                  3 but less than 4                       40%
                  4 but less than 5                       20%
                  5 or more                               0%

            (b)   For purposes of this Plan, a Participant's "Years of Vesting
                  Service" are equal to the aggregate time elapsed between his
                  employment commencement date and his termination of employment
                  with the Company and its Controlled Group, expressed in years
                  and days, subject to the following:

                  (1)   A Participant's "employment commencement date" is the
                        earlier of:

                        (i)   The earliest date on or after January 1, 1998 on
                              which the Participant first performs an Hour of
                              Service for the Company.

                                      -24-
<PAGE>

                        (ii)  If the Participant became an employee of the
                              Company on or after January 1, 1998 and on or
                              before June 1, 1998, and if the Participant was an
                              employee of E. I. du Pont de Nemours and Company,
                              Pioneer Hi-Bred International, Inc., or a member
                              of the Controlled Group of either of those
                              corporations on December 31, 1997, the first day
                              of the Participant's most recent period of
                              continuous service with such entities ending on
                              the day before he became an employee of the
                              Company.

                  (2)   If a Participant who has no vested right to a benefit at
                        the time his termination of employment occurs
                        subsequently has a period of at least 60 consecutive
                        months during which he is not employed by the Company or
                        its Controlled Group (adjusted for absences described in
                        Section XVI.6.(b)), and the break is longer than his
                        Years of Vesting Service prior to the break, all service
                        prior to the break in service shall be disregarded.

                  (3)   The Participant's employment commencement date shall be
                        adjusted by subtracting from his service any period of
                        at least 12 months duration commencing on the later of
                        (i) his termination of employment with the Company and
                        its Controlled Group, or (ii) the first anniversary of
                        the date the individual is absent from service for any
                        reason other than such a termination of employment, and
                        ending on the date he again performs an Hours of
                        Service.

      4.    Distribution of Accounts

            (a)   Subject to the conditions in Paragraph 1 of this Section and
                  Subparagraphs (c) and (i) of this Paragraph, and subject to
                  any retirement deferral election under Subparagraph (d) of
                  this Paragraph, as soon as practicable after termination of
                  participation in the Plan under the provisions of Paragraph 2
                  of this Section, distribution of the balance in the
                  individual's accounts, including all nonforfeited Company
                  Contributions, will be made on the following bases:

                  (1)   For Funds B and C, cash equal to the value of the
                        individual's Units and/or Shares, as appropriate,
                        therein at the valuation date on which the termination
                        of participation occurs, or, where termination is on
                        account of death, the valuation date on the business day
                        preceding the day of distribution.

                  (2)   For Funds D, F and P, delivery of full shares of DuPont
                        and/or Pioneer common stock (as applicable) or of Conoco
                        Class B stock in the individual's account, plus the
                        value in cash of any fractional interests in a share of
                        such stock and accrued income at the valuation date on
                        which termination of participation occurs or, at the
                        election of the individual, some or all in cash.

                                      -25-
<PAGE>

                  (3)   For Fund L, cancellation of the Participant's obligation
                        to repay any outstanding loan, if requested.

            (b)   Subject to the conditions in Paragraph 1 of this Section and
                  Subparagraphs (c), (d) and (i) of this Paragraph, as soon as
                  practicable after termination of participation in the Plan
                  under the provisions of Paragraph 3 of this Section,
                  distribution of the balance in an individual's accounts will
                  be made as provided in Paragraph 4(a) of this Section except
                  that the individual shall forfeit an amount equal to the
                  nonvested percent of the lesser of

                  (1)   the dollar amount of Company Contributions credited to
                        his accounts prior to the valuation date on which
                        termination occurs, or

                  (2)   the current value of the units and shares attributable
                        to his Company Contributions.

                  The forfeiture shall occur as of the earliest of (i) the date
                  the balance of the Participant's Accounts is distributed, (ii)
                  the date the Participant incurs five consecutive One-Year
                  Breaks in Service commencing with his termination of
                  employment, or (iii) the date the Participant dies.

            (c)   Beneficiary Designation

                  (1)   A Participant, Former Participant, or Spouse Beneficiary
                        may designate any beneficiary or beneficiaries he
                        chooses to receive all or part of his interests in Funds
                        B, C, D, F and P in case of his death, and he may
                        replace or revoke such designation. However, in the
                        event the Participant, or Spouse Beneficiary has a
                        spouse, no designation of a person other than the spouse
                        shall be permitted, unless such spouse has consented in
                        writing in the manner prescribed by the Company to
                        another beneficiary, or such consent could not be
                        obtained because the spouse could not be located or
                        because of such other reasons as applicable Treasury
                        Regulations may provide, in which case distribution
                        shall be made as provided in Paragraph 4(a) or (b) of
                        this Section. If no surviving spouse exists and no
                        beneficiary designation is in effect, distribution of
                        the nonforfeitable benefit shall be made to, or in
                        accordance with the directions of, the executor or
                        administrator of the decedent's estate.

                        With respect to non-Spouse Beneficiaries (including a
                        beneficiary who is a spouse of a Former Participant),
                        the nonforfeitable balance of a deceased Participant's,
                        Former Participant's, or Alternate Payee's Plan assets
                        will remain in the accounts and Funds as of the time of
                        his death, pending distribution. Total distribution
                        shall be made to such beneficiaries no later than the
                        end of the twelfth month

                                      -26-
<PAGE>

                        following the death of the Participant, Former
                        Participant, or Alternate Payee.

                        If in the opinion of the Company there is a question as
                        to the legal right of any beneficiary to receive a
                        distribution under the Plan, the amount in question may
                        be paid to the decedent's estate, in which event the
                        Trustee and the Company shall have no further liability
                        to anyone with respect to such amounts. Non-Spouse
                        Beneficiaries may not designate beneficiaries; account
                        balances remaining at the time of their death will be
                        paid to their estates as soon as practicable following
                        the death of the Non-Spouse Beneficiary.

                  (2)   If the Plan Administrator receives a qualified
                        disclaimer (as defined in Code section 2518) from any
                        designated beneficiary entitled to benefits as a result
                        of, and within nine months after, the death of a
                        Participant, Former Participant, Spouse Beneficiary, or
                        Alternate Payee, such benefits shall instead be paid to
                        an alternate beneficiary determined according to a valid
                        beneficiary designation made by the deceased. Payment to
                        an alternate beneficiary on account of receipt of a
                        qualified disclaimer shall not be treated as a violation
                        of Section XVII of the Plan.

            (d)   Retirement Deferral Election

                  (1)   Notwithstanding the provisions of Paragraph 4(a) of this
                        Section,

                        (i)   a Participant, or

                        (ii)  the Spouse Beneficiary of a deceased Participant
                              who had not reached his Required Beginning Date

                        may elect, revoke, or reelect an option to have the
                        distribution in the Participant's Accounts made no later
                        than his Required Beginning Date except that, in the
                        case of a Spouse Beneficiary, distribution of the
                        balance in the accounts shall commence on or before the
                        later of the end of the year in which the deceased
                        employee would have attained age 70 1/2 or the end of
                        the year after that in which the employee died. A
                        Participant or Spouse Beneficiary may revoke the
                        election and request distribution of the balance in the
                        accounts at any time prior to the time prescribed by
                        this subparagraph.

                  (2)   With respect to a Participant or Spouse Beneficiary who
                        has made an election under this Section XVI.4(e):

                        (i)   Transfers between Funds B, C, D and P of the
                              Regular Account and Funds B, C, D and P of the
                              Before-Tax

                                      -27-
<PAGE>

                              Account shall be permitted as set forth in Section
                              VIII.l; and,

                        (ii)  up to three (3) Withdrawals may be made during
                              each calendar year in accordance with Section XIV.

                  (3)   The distribution will be valued as of the date of
                        settlement.

            (e)   Termination of Employment

                  If termination of employment, other than a termination of
                  employment described in Section XVI.2(b), occurs prior to the
                  last scheduled work day of the month, no Matching or Profit
                  Sharing Contributions will be made for the month of
                  termination.

            (f)   Application of Forfeitures

                  All amounts forfeited by Participants terminating their
                  participation in the Plan shall be applied to reduce Company
                  Contributions required by Section V.

            (g)   Sale of Business or Facility

                  A Participant who is credited with at least 5 Years of Vesting
                  Service and whose employment with the Company or with a
                  partnership or a joint venture in which the Company has an
                  ownership interest and with whom such Participant was employed
                  at Company request is to be terminated in connection with the
                  sale by the Company of any business or facility or of the
                  Company's interest in such entity, may, at any time prior to
                  termination of employment, designate that the balance in his
                  Before-Tax and After-Tax Accounts (including the balances in
                  Fund L) be paid in cash and promissory note(s) directly to the
                  trustee of a qualified defined contribution plan maintained by
                  the purchaser of the business or facility if such plan will
                  accept the transfer of assets and note(s).

                  As of the valuation on the day of termination of the
                  Participant's employment, the balance of his Before-Tax
                  Account in Funds B, C, D, F and P and his Regular Account in
                  Funds B, C, D, F and P shall be allocated to his Regular
                  Account in Fund B and the balance of his Before-Tax Account
                  Fund L shall be allocated to his Regular Account Fund L.

                  Payment to the trustee of the receiving plan will be made as
                  soon as practicable after the Company receives satisfactory
                  proof that the requirements of Section 414(1) of the Code will
                  be satisfied in the transfer of assets. At any time prior to
                  such transfer of assets, the individual may request
                  distribution of the balance of his accounts. Such payment to
                  the trustee of the receiving plan or distribution to the
                  individual will be in cash (and promissory note(s), if
                  applicable) as of

                                      -28-
<PAGE>

                  the valuation date on which such proof or request,
                  respectively, is received by the Company.

            (h)   Post Termination Participation

                  After termination of service, Former Participants whose vested
                  account balances exceed $5,000 at the time of termination (or
                  exceeded $5,000 at the time of any previous distribution) and
                  who do not consent to the distribution of their Account
                  balances may elect to participate in the Plan to the extent
                  provided in this Subparagraph. No further Company
                  Contributions or After-Tax Contributions or Before-Tax
                  Contributions will be permitted and such participation shall
                  not count for vesting purposes. A total distribution may be
                  taken at any time. Total distribution shall be made under this
                  Subparagraph no later than the Participant's Required
                  Beginning Date.

            (i)   If a distribution is required under the terms of this Plan,
                  pursuant to the Code, pursuant to a Qualified Domestic
                  Relations Order, or because an account holder requested a
                  distribution and the account holder or alternate payee to whom
                  such a benefit must be paid or who requested payment cannot be
                  located, such distribution shall be held without interest and
                  forfeited six (6) months after the end of the month in which
                  the distribution was required to be made or requested and
                  shall be used to reduce Company Contributions as provided in
                  Section XVI.4(g) provided that the amount of such forfeiture
                  shall be reinstated without interest if, prior to termination
                  of the Plan, a claim is made by the account holder or
                  alternate payee for the forfeited distribution.

            (j)   If an account is created for an Alternate Payee pursuant to a
                  Qualified Domestic Relations Order, no Company Contribution or
                  employee After-Tax and/or Before-Tax Contributions to such
                  account will be permitted. A total distribution may be taken
                  at any time. Total distribution shall be made to the Alternate
                  Payee under this Subparagraph no later than April 1 of the
                  calendar year following the year in which the Participant,
                  from whom the Alternate Payee's account was derived, attains
                  age 70 1/2.

      5.    Form of Payment

            (a)   Except for Withdrawals under Section XIV prior to the
                  Participant's Required Beginning Date or the date any other
                  individual is required to receive distribution under this
                  Section, all distributions shall be in the form of a lump sum
                  distribution of the individual's entire nonforfeitable
                  benefit.

            (b)   Notwithstanding any other provision of this Plan or election
                  by a Participant or Spouse Beneficiary to the contrary, the
                  lump sum distribution shall be made at such time as required
                  by Code section 401(a)(9) and all regulations thereunder.

                                      -29-
<PAGE>

      6.    Reenrollment in Plan

            (a)   After Voluntary Termination of Contributions

                  If a Participant terminates his contributions to the Plan and
                  remains employed, he shall immediately be eligible to begin
                  contributing to the Plan again.

            (b)   After Reemployment

                  If a Participant who has had his participation terminated
                  because his service with the Company was terminated is
                  reemployed, he shall immediately be eligible to participate in
                  the Plan. For purposes of the preceding sentence and Sections
                  XVI.6(c), absence from employment for the following reasons
                  shall be considered service:

                  (i)   pregnancy or birth of a child of the individual,

                  (ii)  placement of a child with the individual in connection
                        with its adoption by the individual; and

                  (iii) caring for such child beginning immediately after such
                        birth or placement.

                  No more than 501 Hours or 12 months, whichever is applicable,
                  shall be considered service under the preceding sentence in
                  connection with any pregnancy or placement.

            (c)   Reinstatement of Forfeitures

                  If a Participant who forfeited Company Contributions is
                  reemployed by the Company or a member of the Company's
                  Controlled Group before he has incurred five consecutive
                  One-Year Breaks in Service commencing with his termination,
                  the dollar amount of the Company Contributions forfeited by
                  the Participant will be restored to his Regular Account and
                  allocated to Funds B, C, D and P in whole multiples of one
                  percent (1%) in accordance with the Participant's
                  authorization.

XVII.  NONASSIGNMENT

       Except as provided by Section 401(a)(13) of the Code, no assignment of
       the rights or interests of account holders under this Plan will be
       permitted or recognized, nor shall such rights or interests be subject to
       attachment or other legal processes for debts.

XVIII. OPERATION OF THE PLAN AS A TOP-HEAVY PLAN

       If it is determined that the Plan is a top-heavy plan, within the meaning
       of Section 416(g) of the Code, for any Plan Year, this Section will
       supersede all other provisions to the contrary and apply for such Plan
       Year.

                                      -30-
<PAGE>

      l.    Minimum Vesting

            Each Participant shall have a nonforfeitable right to the Company
            Contributions in his Regular Account, other than the nonvested
            portion thereof determined from the table in Section XVI.3(a).

      2.    Minimum Contributions

            Contributions by the Company under the Plan, including Before Tax
            Contributions, on behalf of each Participant who has not separated
            from service at the end of the Plan year and who is a non-key
            employee shall not be less than three percent (3%) of his
            Compensation.

      3.    Compensation Limitation

            For any plan year in which the Plan is a top-heavy plan, the
            compensation limitation set forth in Code Section 416(a) shall
            apply.

      4.    Effect on Limitation on Annual Additions

            For any plan year in which the Plan is top-heavy, the combined
            limitation described in Section XIX.7(b) shall be applied by
            substituting "1.0" for "1.25" wherever it appears in Sections XIX.
            14(s) and (v).

      5.    Definitions - For purposes of these top-heavy provisions, the
            following definitions shall apply:

            (a)   Key employees and non-key employees. In determining which
                  employees are key employees and which are non-key employees,
                  the criteria set forth in Code Section 416 and the regulations
                  thereunder shall be applied.

            (b)   Top-heavy ratio. The top-heavy ratio shall be computed in
                  accordance with Code Section 416 and the regulations
                  thereunder.

            (c)   Aggregation Group. For purposes of determining if the Plan is
                  a top-heavy plan for a particular Plan Year, each tax
                  qualified plan of the Company in which a key employee
                  participates in the Plan Year containing the determination
                  date, or any of the four preceding Plan Years, and each other
                  tax qualified plan of the Company, which during this period,
                  enables any plan, in which a key employee participates, to
                  meet the requirements of Code Sections 401 (a)(4) or 410 shall
                  be aggregated within the required aggregation group. All other
                  tax qualified plans which are not required to be aggregated
                  under the preceding sentence but that satisfy the requirements
                  of Code Sections 401(a)(4) and 410 when considered together
                  with the required aggregation group shall also be aggregated.

            (d)   Determination Date. The determination date for any Plan Year
                  shall be September 30 of the preceding Plan Year.

                                      -31-
<PAGE>

            (e)   Valuation Date. The valuation date applicable to the
                  determination date shall be September 30 of the preceding Plan
                  Year.

XIX.  MISCELLANEOUS PROVISIONS

      1.    Plan Administration

            (a)   The Company shall have the authority to control and manage the
                  operation and administration of the Plan and to designate one
                  or more persons to carry out the responsibilities of the
                  operation and administration of the Plan. The Company is a
                  Named Fiduciary for all aspects of the Plan. The Company, or
                  such person or persons as the Company may designate, may
                  employ one or more persons to render advice with regard to any
                  responsibility of the Company or any such person under the
                  Plan.

            (b)   All authorizations, designations and requests concerning the
                  Plan shall be made by employees in the manner prescribed by
                  the Company.

            (c)   The Company, or its designee by written instrument, shall have
                  the responsibility of appointing Trustees, as provided in
                  Paragraph 1 of Section IX, Paragraph 1(a) of Section X,
                  Paragraph 1 of Section XI and Paragraph 1 of Section XII, and
                  the Company, or its designee by written instrument, shall have
                  the responsibility of making the designations called for
                  pursuant Paragraph l(b) of Section X. The Company, or its
                  designee by written instrument, shall have the authority to
                  appoint an investment manager to invest and manage all or any
                  portion of the assets of the Plan, and to delegate to such
                  investment manager or any other person the power and authority
                  to appoint and enter into agreements with additional
                  investment managers to manage all or any portion of the assets
                  of the Plan.

            (d)   The Company retains discretionary authority to determine
                  eligibility for benefits hereunder and to construe the terms
                  and conditions of the Plan. The decision of the Company shall
                  be final with respect to any questions arising as to
                  interpretation of this Plan.

            (e)   The Company is the Plan Administrator.

            (f)   Subject to the requirements of the Code, the Company may
                  authorize the Trustees of the Plan to accept a rollover of
                  assets in cash and/or DuPont or Pioneer common stock, or
                  Conoco Class B stock, received in a qualified distribution
                  from a qualified employer plan as described in Code Sec.
                  402(a)(5), or received in a distribution from an individual
                  retirement account, as described in Code Sec.
                  408(d)(3)(A)(ii). Any such stock received will be allocated to
                  the Regular Account Fund that holds such stock. The Account
                  Holder shall designate the manner in which all other rollover
                  contributions to the Plan will be invested. All amounts so
                  received will be treated as Earnings in the Regular Account.
                  Only taxable amounts may be rolled over under this Section.

                                      -32-
<PAGE>

            (g)   A newly hired employee who has made a rollover contribution to
                  the Plan in accordance with Subparagraph (f) who has not
                  otherwise become a Participant of the Plan may make, with
                  respect to his rollover contribution, fund transfers in
                  accordance with Section VIII and withdrawals in accordance
                  with Section XIV; provided, however, that such employee shall
                  not have a right to make Before-Tax Contributions, After-Tax
                  Contributions or have Company Contributions made on his behalf
                  or institute loans until he has otherwise satisfied the
                  requirements imposed by Section II.

            (h)   Subject to the requirements of the Code, the Company may
                  authorize the Trustees of the Plan to accept a trust-to-trust
                  transfer of assets requested by a Participant or Spouse
                  Beneficiary in cash and/or DuPont or Pioneer common stock, or
                  Conoco Class B stock, received from a qualified defined
                  contribution plan. Any such stock shall be allocated to the
                  Regular Account Fund that holds such stock. The account holder
                  shall designate the manner in which all other transferred
                  contributions to the Plan will be invested. Taxable amounts
                  received pursuant to this Section will be treated as Earnings
                  in the Regular Account. Nontaxable amounts will be treated as
                  Unmatched After-Tax Contributions. Transfers from any
                  qualified defined contribution plan maintained by E. I. du
                  Pont de Nemours and Company or Pioneer Hi-Bred International,
                  Inc. are specifically authorized under this paragraph.

            (i)   Payments from the Plan may be "eligible rollover
                  distributions" if they are not payments for an account
                  holder's lifetime (or life expectancy), or account holder's
                  lifetime and his beneficiary's lifetime (or life expectancy)
                  or a period of ten years or more. Only taxable amounts of the
                  distributions are "eligible for rollover distribution".

                  A Participant, Former Participant, Spouse Beneficiary or
                  Alternate Payee may instruct the Plan Administrator to make a
                  direct rollover of all or a portion of his distribution that
                  is an "eligible rollover distribution" to another qualified
                  plan or an Individual Retirement Account.

                  In the event a Participant, Former Participant, Spouse
                  Beneficiary or Alternate Payee elects not to make a direct
                  rollover of all or any portion of his "eligible rollover
                  distribution", the distribution shall be subject to the 20%
                  withholding specified in Code Section 3405.

            (j)   Overpayments of a distribution under this Plan shall be repaid
                  within thirty (30) days after written demand is made for
                  repayment by the Plan Administrator. In the event repayment is
                  not made either within thirty (30) days of such demand or in
                  accordance with such terms as may be agreed to by the Plan
                  Administrator, an amount, to the extent available, equivalent
                  to the overpaid amount shall be deemed to have been withdrawn
                  by the account holder under Section XIV, XV or XVI, whichever
                  is applicable, and the limitation on the number of Withdrawals
                  contained in Section XIV.1. shall not apply to such

                                      -33-
<PAGE>

                  Withdrawal. Until any remaining overpaid amount is repaid or
                  restored, a Participant shall neither deposit After-Tax
                  Contributions nor make Before-Tax Contributions, and Company
                  Contributions shall be suspended.

            (k)   Notwithstanding any other provision of the Plan, benefits
                  under the Plan shall be limited as required by the Internal
                  Revenue Code.

      2.    Administrative Expense

            Reasonable expenses of administering the Plan, including, but not
            limited to, recordkeeping expenses, trustee fees, and transactional
            costs shall, at the election of the Plan Administrator, be paid by
            account holders. Brokerage fees, transfer taxes, investment fees and
            other expenses incident to the purchase and sale of securities and
            other investments in Funds B, C, D, F and P shall be included in the
            cost of such securities or investments, or deducted from the sales
            proceeds, as the case may be.

      3.    Modification or Termination

            The Company reserves the right to change or discontinue this Plan in
            its discretion by action of the Company or by written instrument
            executed by such person or persons as the Company may designate. In
            the event of the complete or partial termination of the Plan, or
            complete discontinuance of Company Contributions under the Plan,
            distribution of full shares of DuPont, Pioneer or Conoco stock, and
            all cash balances including those resulting from the liquidation of
            Funds B and C will be made to the affected Participants in
            accordance with Section XVI.4(a).

      4.    Transition to Amended Plan

            Where an individual is in a bargaining unit represented by a union
            for collective bargaining, with which discussions have been had
            concerning this Plan as last amended, the provisions of the amended
            Plan shall not become effective for such individual unless and until
            (i) such discussions or (ii) existing collective bargaining
            agreements result in favor of applicability of the amended Plan. The
            terms of the Plan in effect immediately prior to the last amendment
            shall continue to apply to an individual so excluded unless and
            until discussions with the union representing his unit have
            concluded in favor of applicability to the unit of the amended Plan
            or of other employee benefits in lieu thereof, or unless and until
            the individual is made eligible under the amended Plan by lawful
            unilateral action of the Company.

      5.    Transfer of Assets

            (a)   In the case of any merger or consolidation with, or transfer
                  of assets or liabilities to, any other plan, each employee
                  shall (if the Plan is then terminated) receive a benefit
                  immediately after the merger, consolidation, or transfer which
                  is no less than the benefit to which he would have been
                  entitled immediately before the merger, consolidation, or
                  transfer (if the Plan had then terminated).

                                      -34-
<PAGE>

            (b)   In connection with an individual's transfer of employment from
                  an affiliated group company or an individual's employment with
                  the Company immediately upon the termination of such
                  individual's employment, at Company request, from a
                  partnership or joint venture in either of which the Company
                  has an ownership interest or a corporation which has an
                  ownership interest in the Company or a member of the
                  Controlled Group of such a corporation, the balances in his
                  qualified profit-sharing plan accounts which are transferred
                  to this Plan will be deposited in Regular and Before-Tax
                  Accounts, as appropriate, and allocated in cash or in kind to
                  Funds B, C, D, F or P, except that any cash transferred will
                  be deposited in Fund B and any promissory note(s) will be
                  converted to a promissory note under this Plan and transferred
                  to Fund L. The determination of whether the account balances
                  are to be transferred in cash or in kind shall be made by the
                  Plan Administrator. All amounts transferred to this Plan under
                  this Subsection (b), and the earnings on those amounts, will
                  be 100% vested at all times.

                  An individual's period of participation under this Plan will
                  include his period of continuous participation in the
                  qualified profit-sharing plan of the affiliated group company
                  immediately preceding the transfer of employment. With respect
                  to an individual who was employed by the Company immediately
                  upon the termination of such individual's employment, at
                  Company request, from a partnership or joint venture in which
                  the Company has an ownership interest or a corporation which
                  has an ownership interest in the Company or a member of the
                  Controlled Group of such corporation, years of service for
                  vesting by the individual in such entity's qualified
                  profit-sharing plan shall be recognized as Years of Vesting
                  Service in this Plan provided such individual transfers his
                  entire account balance from the qualified profit-sharing plan
                  of such entity to this Plan. An individual with respect to
                  whom company contributions to the plan of an such company,
                  partnership or joint venture were suspended at the time of his
                  transfer or of his employment by the Company from such
                  partnership or joint venture will not be entitled to Company
                  Contributions under this Plan until the suspension period
                  lapses. A withdrawal by a participant of any part of a
                  qualified profit-sharing plan account remaining to his credit
                  in the plan of such company, partnership or joint venture,
                  where such account remains after his transfer from such
                  company, partnership or joint venture to any other such
                  company, partnership or joint venture will have the same
                  effect on his participation in this Plan as if he made such
                  withdrawal from this Plan.

            (c)   In connection with the acquisition of a business or facility,
                  the Company, in its discretion, may direct the Trustee of Fund
                  B of the Plan to accept a transfer of assets, in cash, or the
                  Trustees of Funds B and L to accept a transfer of assets in a
                  combination of cash and promissory note(s) which note(s) must
                  be converted to note(s) under this Plan and transferred to
                  Fund L from the trustee(s) of a qualified defined contribution
                  plan maintained by the seller of the business or

                                      -35-
<PAGE>

                  facility. The cash received will be allocated to the
                  employees' accounts in Fund B based on the value on the date
                  in which the transfer takes place. Amounts received which were
                  employee contributions will be treated as Unmatched After-Tax
                  amounts; amounts which were Before-Tax Contributions will be
                  treated as Unmatched Before-Tax amounts; amounts which were
                  Earnings on Before-Tax amounts will be treated as Earnings on
                  Before-Tax amounts; and all other amounts received will be
                  treated as Earnings in the Regular Account. The Company may
                  recognize service with the seller by an employee for purposes
                  of eligibility in this Plan and may also recognize
                  participation in the seller's plan by an employee who enrolls
                  in the Plan and whose entire account assets are transferred to
                  this Plan for purposes of participation in this Plan, and the
                  assets transferred for his account will be valued in
                  accordance with Section X.3.

            (d)   In connection with the previous acquisition of a business or
                  facility in which the seller agreed to later reemploy
                  individuals who had become employees of the Company, the
                  Company may, in its discretion, direct the Trustees of the
                  Plan to transfer account balances of Former Participants who
                  are so reemployed to the trustee of the seller's qualified
                  defined contribution plan, provided the requirements of
                  Section 414(1) of the Code will be satisfied in the transfer
                  of assets.

      6.    No Guarantee of Security Values

            The Company does not guarantee or represent in any way that the
            value of stocks and other assets in which the account holder has an
            interest will increase or will not decrease. Each Participant
            assumes all risks in connection with any changes in the value of
            securities and other assets in the various Funds in which he may
            have an interest.

      7.    Limitations on Annual Additions

            This Plan provision supersedes any other Plan provision which would
            conflict with this one.

            (a)   In no case may annual additions to a Participant's account,
                  determined on a calendar year basis, either solely under the
                  Plan or under an aggregation of the Plan with all other
                  Defined Contribution Plans maintained by the Corporate
                  Employer, exceed the lesser of 25% of his Compensation or
                  $30,000 (adjusted for each Plan Year to reflect cost of living
                  increases for that year published by the Secretary of
                  Treasury). For this purpose, "annual additions" are, for any
                  year, the sum of (1) contributions to a Defined Contribution
                  Plan on behalf of a Participant by the Corporate Employer,
                  including deferrals under Code Section 401(k), and (2)
                  employee contributions. If the limitation in this paragraph
                  would otherwise be exceeded, After-Tax and Before-Tax
                  Contributions will be returned or paid, and Company
                  Contributions will be removed from the employee's account and
                  applied to reduce the subsequent contributions of the Company
                  under the Plan, to the extent necessary, as determined by the
                  Plan Administrator.

                                      -36-
<PAGE>

            (b)   Prior to January 1, 2000, when annual additions are viewed in
                  conjunction with an employee's interest in all other Defined
                  Benefit and Defined Contribution Plans of the Corporate
                  Employer, the sum of the Defined Benefit Plan Fraction and the
                  Defined Contribution Plan Fraction for any year shall not
                  exceed 1.0. If the limitation in this paragraph would
                  otherwise be exceeded, the Plan Administrator shall determine
                  the extent to which the Participant's benefit under any one or
                  more of such plans shall be reduced in order to comply with
                  that limitation in such a manner as to maximize the aggregate
                  benefits payable to the Participant.

            (c)   From time to time, and at least annually, the level of
                  participation in the Plan will be reviewed and, if necessary,
                  the amount of After-Tax and Before-Tax Contributions which may
                  be elected in accordance with Paragraph 1 of Section IV will
                  be adjusted to assure that the Plan continues to satisfy
                  Internal Revenue Service guidelines.

      8.    Qualified Domestic Relations Orders

            The Plan will make payment from an account holder's Regular and/or
            Before-Tax Account as required by a qualified domestic relations
            order, as defined under Sec. 414(p) of the Code. Any amounts awarded
            to an alternate payee, prior to the death of the Participant or
            Former Participant pursuant to a domestic relations order determined
            by the Plan Administrator to be qualified shall be distributed
            within 90 days of such determination, unless the qualified domestic
            relations order specifies that the Alternate Payee shall have an
            account in the Plan. No Loan, Withdrawal, or other action otherwise
            permissible pursuant to any provision of the Plan shall be taken
            which, in the opinion of the Plan Administrator, may be inconsistent
            with the provisions of a qualified domestic relations order.

      9.    Military Service

            Notwithstanding any provision of this Plan to the contrary,
            contributions, benefits and service credit with respect to qualified
            military service will be provided in accordance with Section 414(u)
            of the Code.

      10.   Normal Retirement Age

            Normal retirement age under the Plan is age 65.

      11.   Compensation Taken into Account

            The maximum amount of annual compensation of a Participant that
            shall be taken into account under this Plan for any year shall not
            exceed the amount prescribed in Code Section 401(a)(17).

                                      -37-
<PAGE>

      12.   No Decrease of Accrued Benefit

            No amendment to the Plan shall be effective to the extent it has the
            effect of decreasing a Participant's accrued benefit. For purposes
            of this paragraph, a Plan amendment which has the effect of
            decreasing the Participant's account balance or eliminating an
            optional form of benefit, with respect to the benefits attributable
            to service before the amendment shall be treated as reducing an
            accrued benefit.

      13.   Change to Vesting Schedule

            If the Plan's vesting schedule is amended, or the Plan is amended in
            any way that directly or indirectly affects the computation of the
            Participant's nonforfeitable percentage or if the Plan is deemed
            amended by an automatic change to or from a top-heavy vesting
            schedule, each Participant with at least three (3) Years of Service
            with the Employer may elect, within a reasonable period after the
            adoption of the amendment or change, to have the nonforfeitable
            percentage computed under the Plan without regard to such amendment
            or change.

            The period during which the election may be made shall commence with
            the date the amendment is adopted or deemed to be made and shall end
            on the latest of:

            (1)   Sixty (60) days after the amendment is adopted;

            (2)   Sixty (60) days after the amendment becomes effective; or

            (3)   Sixty (60) days after the Participant is issued written notice
                  of amendment by the Employer or Plan Administrator.

            Furthermore, if the vesting schedule of a Plan is amended, in the
            case of an Employee who is a Participant as of the later of the date
            such amendment is adopted or the date it becomes effective, the
            nonforfeitable percentage (determined as of such date) of such
            Employee's right to his Employer-derived accrued benefit will not be
            less than his percentage computed under the Plan without regard to
            such amendment.

      14.   Definitions

            (a)   The term "Affiliated Group" means the Controlled Group, but
                  does not include any foreign subsidiary or any domestic
                  subsidiary which derives in excess of 50% of its gross income
                  for a taxable year from sources without the United States (as
                  defined in Section 7701(a)(9) of the Code).

            (b)   The term "Code" means the Internal Revenue Code of 1986, as
                  amended.

            (c)   The term "Company" means Optimum Quality Grains, L.L.C., a
                  Delaware limited liability corporation. It also includes any
                  wholly

                                      -38-
<PAGE>

                  owned subsidiary, joint venture or partnership in which the
                  Company has an ownership interest, provided that such entity
                  (1) adopts this Plan with the approval of the Company, or such
                  person or persons as the Company may designate and (2) agrees
                  to make contributions in respect of any of its employees who
                  become Participants of the Plan.

            (d)   The term "Controlled Group" means the Company and its
                  controlled group of corporations within the meaning of Section
                  1563(a) of the Code. Any reference to the "Controlled Group"
                  of E. I. du Pont de Nemours and Company or Pioneer Hi-Bred
                  International, Inc. means the controlled group related to said
                  corporation within the meaning of Code Section 1563(a).

            (e)   The term "Before-Tax Account" means the account in which a
                  Participant's Before-Tax Contributions and earnings thereon
                  are maintained.

            (f)   The term "employee"

                  (1)   Includes all employees of the Company.

                  (2)   Excludes an individual who is on temporary assignment
                        with the Company from a foreign affiliate of the Company
                        with the expectation that he will return to duties with
                        the foreign affiliate at the end of a period not
                        exceeding three years.

                  (3)   Excludes any individual during any period during which
                        the individual is classified by the Company as an
                        independent contractor or as any other status in which
                        the person is not treated as a common law employee of
                        the Company for purposes of withholding taxes,
                        regardless of the correct legal status of the
                        individual. The previous sentence applies to all periods
                        of such service of an individual who is subsequently
                        reclassified as an employee, whether the
                        reclassification is retroactive or prospective.

                  (4)   Includes an individual who must be treated as an
                        employee under Section 414(n) of the Code (a "Leased
                        Employee"), but only to the extent required by that Code
                        section and final regulations thereunder. A Leased
                        Employee shall be treated as an employee for purposes of
                        determining Hours of Service for participation and
                        nonforfeitability of benefits (in the event the
                        individual becomes an employee without regard to this
                        paragraph). A Leased Employee shall be treated as an
                        employee for purposes of the other requirements set out
                        in Section 414(n)(3) of the Code. Notwithstanding
                        anything herein to the contrary, no Leased Employee
                        shall be a Participant in this Plan.

            (g)   The term "Hour of Service" means each hour for which an
                  employee is compensated or entitled to compensation for the
                  performance of duties

                                      -39-
<PAGE>

                  and includes each such hour for which back pay, irrespective
                  of mitigation of damages, has been awarded or agreed to. An
                  hour also includes each hour for which an employee is
                  compensated or entitled to compensation due to vacation,
                  holiday, illness, incapacity (including disability), jury
                  duty, or leave of absence. No more than 501 hours shall be
                  credited hereunder to any employee on account of any single
                  continuous period during which no duties are performed. Hours
                  shall be credited to the period during which the duties are
                  performed or to which the payment relates and, in the case of
                  a period where no duties are performed, shall be credited on
                  the basis of the number of regularly scheduled working hours
                  during the period. Hours shall be computed with respect to
                  service with the Company and all other members of the
                  Company's Controlled Group, and shall be aggregated for
                  service with all such employers. All hours shall be credited
                  in conformance with Section 2530.200b-2(b) and (c) of
                  Department of Labor regulations, which is incorporated herein
                  by reference.

            (h)   The term "Matched Before-Tax" means Before-Tax Contributions
                  on which related Matching Contributions are based.

            (i)   The term "Matched After-Tax" means After-Tax Contributions on
                  which related Matching Contributions are based.

            (j)   The term "Monthly Pay" means an employee's base salary or
                  wages and overtime pay paid to the employee by the Company
                  during a particular month. Monthly Pay does not include
                  severance pay, allowances or reimbursements for expenses,
                  fringe benefits, long term incentive compensation or gain
                  sharing, or any other extra or added types of compensation.
                  However, Monthly Pay includes Before-Tax and After-Tax
                  Contributions to this Plan and any pre- tax salary reductions
                  for any plan subject to Code Section 125.

            (k)   The term "Plan Year" means the calendar year.

            (l)   The term "Regular Account" means the account in which a
                  Participant's After-Tax Contributions, Company Contributions,
                  and earnings thereon are maintained. The Company may direct
                  that separate subaccounts shall be maintained for After-Tax
                  Contributions, Matching Contributions and Profit Sharing
                  Contributions and earnings attributable to each type of
                  contributions.

            (m)   The term "Matching Contributions" and "Profit Sharing
                  Contributions" have the meanings assigned to them in Section
                  V.

            (n)   The term "Settlement" means final valuation of an account
                  holder's accounts in preparation for distribution of the
                  balance of his accounts.

            (o)   The term "Unmatched Before-Tax" means Before-Tax Contributions
                  on which no related Matching Contributions are based.

                                      -40-
<PAGE>

            (p)   The term "Unmatched After-Tax" means After-Tax Contributions
                  deposited in the Participant's accounts, on which no related
                  Matching Contributions are based.

            (q)   The term "Corporate Employer" shall mean the Controlled Group,
                  as modified by Code Section 415(h).

            (r)   The term "Defined Benefit Plan" shall mean a defined benefit
                  plan as defined in Code Section 414(j) that is qualified under
                  the Code.

            (s)   The term "Defined Benefit Plan Fraction" for any year shall be
                  a fraction, the numerator of which is an amount representing
                  the total Projected Annual Benefit of the employee under all
                  Defined Benefit Plans of the Corporate Employer, determined as
                  of the close of the year, and the denominator of which is the
                  lesser of (i) the product of 1.25 multiplied by the dollar
                  limitation set forth in Code Section 415(b)(1)(A) (as adjusted
                  under Code Section 415(b)(2) or in accordance with regulations
                  or other official announcements issued by the Secretary of
                  Treasury), or (ii) the product of 1.4 multiplied by 100% of
                  the employee's average Compensation for his high 3 years.

            (t)   The term "Compensation" shall mean the compensation of the
                  Participant, as defined in Treasury Reg. 1.415-2(d), but
                  including any elective deferrals not includible in the gross
                  income of the employee pursuant to Code Sections 125 or
                  401(k), from the Corporate Employer for the year. The annual
                  compensation of each Participant taken into account for
                  determining all benefits provided under the Plan for any
                  determination period shall not exceed $160,000 for Plan Years
                  after 1997, as such limit is adjusted by the Secretary as
                  provided under Section 415(d) of the Code. If the period for
                  determining compensation used in calculating an allocation for
                  a determination period is a short Plan Year (i.e., shorter
                  than 12 months), the annual compensation limit is an amount
                  equal to the otherwise applicable annual compensation limit
                  multiplied by a fraction, the numerator of which is the number
                  of months in the short Plan Year, and the denominator of which
                  is 12.

            (u)   The term "Defined Contribution Plan" shall mean a defined
                  contribution plan as defined in Code Section 414(i) that is
                  qualified under the Code.

            (v)   The term "Defined Contribution Plan Fraction" for any year
                  shall mean a fraction, the numerator of which is the sum of
                  the annual additions to the employee's account under all
                  Defined Contribution Plans of the Corporate Employer as of the
                  close of the year, and the denominator of which is the sum of
                  the lesser of the following amounts determined for such year
                  and for each prior year of service with the Corporate
                  Employer: (i) the product of 1.25 multiplied by the dollar
                  limitation under Code Section 415(c)(1)(A) for such year
                  (determined without regard to Code Section 415(c)(6)), or (ii)
                  the product of 1.4 multiplied by 25% of the employee's
                  Compensation for such year.

                                      -41-
<PAGE>

            (w)   The term "Projected Annual Benefit" shall mean the benefits
                  which are projected to be paid annually under all Defined
                  Benefit Plans of the Corporate Employer to an employee payable
                  as a straight life annuity commencing at normal retirement
                  age. Such projection shall be based on the assumptions that:

                  (1)   The employee's compensation for all future years will
                        equal his Compensation for the year of computation,

                  (2)   The employee's future participation in the Defined
                        Benefit Plans of the Corporate Employer will continue
                        uninterrupted until he has reached normal retirement age
                        and that he will earn a full year of service for each
                        full year he participates in the Defined Benefit Plans
                        of the Corporate Employer during that period, and

                  (3)   All other relevant factors considered in computing the
                        benefits will remain constant with the year of
                        computation.

            (x)   The term "Transfer" means transfer of Plan assets between or
                  among the various Plan Funds in accordance with Section VIII
                  of the Plan.

            (y)   The term "Highly Compensated Employee" shall mean an
                  individual described as such in Code Section 414(q). Unless
                  otherwise provided in Code Section 414(q), each employee who
                  meets one of the following requirements is a "Highly
                  Compensated Employee":

                  (1)   The employee at any time during the current or prior
                        Plan Year was a more than 5-percent owner as defined in
                        Code Section 414(q)(2), or was the spouse, child, parent
                        or grandparent of such an owner to whom the owner's
                        stock is attributed pursuant to Code Section 318
                        (regardless of the Compensation of the owner or family
                        member).

                  (2)   The employee received Compensation from the employer in
                        excess of $80,000 for the prior Plan Year. The dollar
                        amount specified in the previous sentence shall be
                        indexed for cost of living increases for each calendar
                        year after 1998 as provided in the applicable Treasury
                        regulations. For any Plan Year, the applicable dollar
                        amount shall be the dollar amount in effect for the
                        calendar year in which the Plan Year commences.

                  (3)   The individual is a former employee who had a separation
                        year prior to the current Plan Year and such individual
                        performed services for the employer and was a Highly
                        Compensated Employee for either (i) such separation
                        year, or (ii) any Plan Year ending on or after the
                        individual's 55th birthday. A "separation year" is the
                        Plan Year in which the individual separates from service
                        with the employer.

                                      -42-
<PAGE>

                  For purposes of this Paragraph (y), "employer" includes the
                  Company and all Affiliated Group members, and "employee"
                  includes Leased Employees.

            (z)   The term "Variable Pay" shall mean the variable payment under
                  a pay program that relates a portion of total pay to business
                  objectives such that if objectives are met, targeted pay
                  levels are reached; but if objectives are exceeded or are not
                  met, pay is above or below targeted levels. The term includes
                  only amounts paid under a short-term annual program, and does
                  not include long-term incentives.

            (aa)  The term "Spouse Beneficiary" shall mean a spouse who is
                  designated a primary beneficiary of a Participant in
                  accordance with Section XVI.4(d).

            (bb)  The term "Participant" shall mean an employee of the Company
                  who is participating in this Plan in accordance with the terms
                  of the Plan.

            (cc)  The term "Former Participant" shall mean an individual who had
                  been a Participant but whose service with the Company and its
                  Controlled Group has terminated.

            (dd)  A Participant's "Required Beginning Date" is April 1 of the
                  calendar year following the later of (i) the calendar year in
                  which the Participant attained age 70 1/2, or (ii) the
                  calendar year in which the Participant's termination of
                  employment occurs. However, clause (ii) of the previous
                  sentence does not apply to any Participant who is more than
                  5-percent owner of the Company (as defined in Code Section
                  416) with respect to the Plan Year ending in the calendar year
                  in which the Participant attains age 70 1/2.

            (ee)  The term "accountholder" includes any Participant, Retired
                  Participant, Former Participant, Alternate Payee or Spouse
                  Beneficiary who has an Account in the Plan.

                                      -43-

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