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                                                                   EXHIBIT 10.11








                         ARISTECH CHEMICAL CORPORATION

                         1996 SUPPLEMENTAL PENSION PLAN

                          EFFECTIVE FEBRUARY 22, 1996


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                         ARISTECH CHEMICAL CORPORATION

                         1996 SUPPLEMENTAL PENSION PLAN

                          Effective February 22, 1996

Article I  -  Background, Purpose and Effective Date

         The Aristech Chemical Corporation Supplemental Pension Plan was
         amended and restated in its entirety effective March 8, 1990 and was
         again amended and restated effective February 22, 1994 (as so amended
         and restated, the "Original Plan"). This Aristech Chemical Corporation
         1996 Supplemental Pension Plan (the "Plan") amends and restates the
         Original Plan effective February 22, 1996 to modify the benefit
         accrual provisions and make other appropriate changes.

         The purposes of the Plan are to promote the growth and profitability
         of Aristech Chemical Corporation, to attract and retain key executives
         of outstanding competence and to provide key executives with
         supplemental pension benefits under the terms and conditions hereof.
         This Plan is intended to be an unfunded plan maintained primarily for
         the purpose of providing deferred compensation for a select group of
         management or highly compensated employees as described in Section
         401(a)(1) of the Employee Retirement Income Security Act of 1974, as
         amended.

         The provisions of this Plan shall be effective February 22, 1996 and
         shall apply only to persons who are in the active service of the
         Company on or after such date.

Article II  -  Definitions

         As used herein, the following terms shall have the meaning set forth:

         2.01         "Accrued Benefit" shall mean, as of a determination date,
                      the monthly benefit earned under Section 5.01 as reduced,
                      if applicable, pursuant to Section 5.02.

         2.02         "Actuarial Equivalent" shall have the meaning given to
                      that term under the Salaried Pension Plan.

         2.03         "Administrator" shall mean a committee comprised of the
                      Chairman and Chief Executive Officer, the Senior Vice
                      Chairman and Chief Financial Officer, and the President
                      and Chief Operating Officer of the Company.

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         2.04         "Average Monthly Earnings" shall mean, for any Member,
                      the average monthly earnings of the Member during the
                      sixty (60) consecutive months out of the last 120 months
                      prior to Retirement during which such earnings were the
                      highest.  For this purpose a Member's "earnings" shall
                      include Base Salary and Incentive Bonus.

         2.05         "Base Salary" shall mean the total annual base salary
                      payable to a Member at the salary rate in effect on the
                      date specified, but without reduction for any salary
                      reduction contributions (i) to cash or deferred
                      arrangements under Section 401(k) of the Code, (ii) to a
                      cafeteria plan under Section 125 of the Code, or (iii) to
                      a non-qualified deferred compensation plan.  Base salary
                      shall not take into account any Incentive Bonuses, other
                      incentive pay, reimbursed expenses, credits or benefits
                      under any plan of deferred compensation to which the
                      Company contributes, or any additional cash compensation
                      or compensation payable in a form other than cash.

         2.06         "Beneficiary" shall mean the person, persons, trust,
                      trusts or other entity designated by a Member in writing
                      to receive benefits payable under this Plan in respect of
                      such Member. In the absence of such designation, a
                      Member's Beneficiary shall be his spouse, and if none,
                      his estate.

         2.07         "Benefit Calculation Service" shall have the meaning
                      given to that term in the Salaried Pension Plan.

         2.08         "Board" shall mean the Board of Directors of the Company.

         2.09         "Code" shall mean the Internal Revenue Code of 1986, as
                      the same may be amended from time to time.

         2.10         "Change in Control" shall mean

                      (a)           any transaction that results in Mitsubishi
                                    Corporation and its subsidiaries (which
                                    shall include any corporation in an
                                    unbroken chain of corporations beginning
                                    with Mitsubishi Corporation if each of the
                                    corporations other than the last
                                    corporation in the unbroken chain owns
                                    stock possessing at least fifty percent (50
                                    percent) of the total combined voting power
                                    of all classes of stock in one of the other
                                    corporations in the chain) (collectively,
                                    the "MC Group") no longer being the
                                    beneficial owner (as defined in

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                                    Rules 13d-3 and 13d-5 under the Securities
                                    Exchange Act of 1934, as amended, which
                                    shall in any event include having the power
                                    to vote (or cause to be voted at the
                                    direction of any member of the MC Group)
                                    pursuant to contract, irrevocable proxy or
                                    otherwise) of stock possessing at least
                                    fifty percent (50 percent) of the combined
                                    voting power of the issued and outstanding
                                    shares of all classes of the Company's
                                    stock entitled to vote generally in the
                                    election of directors ("Voting Stock"),
                                    whether as a result of the issuance of
                                    securities of the Company, any direct or
                                    indirect transfer of securities of the
                                    Company or otherwise; or

                      (b)           approval by the stockholders of the Company
                                    of a reorganization, merger or
                                    consolidation, unless, following such
                                    reorganization, merger or consolidation,
                                    the MC Group beneficially owns, directly or
                                    indirectly, stock possessing at least fifty
                                    percent (50 percent) of the total combined
                                    voting power of the issued and outstanding
                                    shares of all classes of Voting Stock of
                                    the corporation resulting from such
                                    reorganization, merger or consolidation; or

                      (c)           approval by the stockholders of the Company
                                    of a complete liquidation or dissolution of
                                    the Company; or

                      (d)           the sale or other disposition of 60 percent
                                    or more by value of the assets of the
                                    Company other than to a corporation with
                                    respect to which, following such sale or
                                    disposition, the MC Group beneficially
                                    owns, directly or indirectly, stock
                                    possessing at least fifty percent (50
                                    percent) of the total combined voting power
                                    of the issued and outstanding shares of all
                                    classes of Voting Stock.

         2.11         "Company" shall mean Aristech Chemical Corporation and
                      its successors and assigns.

         2.12         "Early Retirement Date" shall mean the first day of the
                      month coincident with or immediately following the date a
                      Member terminates employment (for reasons other than
                      death) after attaining age 55 and being credited with at
                      least 10 years of Vesting Service but prior to his Normal
                      Retirement Date.

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         2.13         "Financial Hardship" shall mean an unexpected need for
                      cash arising from an illness, disability, casualty loss,
                      sudden financial reversal, or other such unforeseeable
                      occurrence as determined by the Administrator.  Cash
                      needs arising from foreseeable events such as the
                      purchase of a residence or education expenses for
                      children shall not, alone, be considered a Financial
                      Hardship.

         2.14         "Incentive Bonus" shall mean amounts paid in cash to a
                      Member by the Company in the form of annual variable
                      compensation or bonuses, but without reduction for any
                      deferrals under (i) cash or deferred arrangements under
                      Section 401(k) of the Code, (ii) a cafeteria plan under
                      Section 125 of the Code or (iii) a non-qualified deferred
                      compensation plan.

         2.15         "Member" shall mean an employee of the Company who is
                      eligible to participate in the Plan as set forth in
                      Article III.

         2.16         "Normal Retirement Date" shall mean the first day of the
                      month coincident with or immediately following the date a
                      Member terminates employment after attaining age 65.

         2.17         "Plan" shall mean this Aristech Chemical Corporation 1996
                      Supplemental Pension Plan, as the same may be amended
                      from time to time.

         2.18         "Primary Insurance Amount" shall mean the monthly amount
                      of old age insurance benefits under Section 202 of the
                      Social Security Act payable to a Member at a single age
                      that is not earlier than age 62 and not later than age
                      65.  A Member's Primary Insurance Amount shall be
                      determined under the Social Security Act as in effect at
                      the time the Member's offset is determined, based on the
                      Member's then-current compensation and other relevant
                      factors.

         2.19         "Retirement" shall mean a Member's retirement at his
                      Early Retirement Date or Normal Retirement Date, as
                      applicable.

         2.20         "Salaried Pension Plan" shall mean the Aristech Salaried
                      Pension Plan, as the same may be amended from time to
                      time.

         2.21         "Vesting Service" shall have the meaning given to that
                      term under the Salaried Pension Plan.

                                     - 4 -


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Article III  -  Designation of Members

         3.01         Board Action.  Members of the Corporate Management
                      Committee of the Company shall automatically be Members
                      under the Plan.  From time to time, the Board may
                      designate additional key employees of the Company as
                      Members eligible to participate in the Plan.  Such
                      determination shall take the form of a resolution adopted
                      by the Board identifying such employees by name or by
                      title of position.  In making such determination, the
                      Board shall give consideration to the function and
                      responsibilities of the employee, his or her past
                      performance, his or her contributions to the
                      profitability and sound growth of the Company and such
                      other factors as the Board may deem appropriate.  Such
                      determination need not be uniform and may be made
                      selectively by the Board among the employees of the
                      Company.

         3.02         Conditions to Benefit Payments.  Notwithstanding any
                      provision of this Plan to the contrary, no benefits shall
                      be paid in respect of a Member, either directly to the
                      Member or to his or her Beneficiary, who is terminated
                      for Cause.  As used herein, the term "Cause" shall be
                      limited to (a) action by the employee involving willful
                      and wanton malfeasance involving specifically a wholly
                      wrongful and unlawful act; (b) the employee being
                      convicted of a felony; or (c) a material violation by the
                      employee of any rule, regulation or policy of the Company
                      generally applicable to all employees.  Nothing contained
                      in this Section 3.02 shall prevent the payment of
                      benefits in respect of a Member whose employment is
                      involuntarily terminated for reasons other than Cause
                      after such Member's benefits have vested.


Article IV  -  Administration

         The Plan shall be administered by the Administrator in a manner not
         inconsistent with the provisions of the Plan and in so doing the
         Administrator shall have the authority, from time to time, to:

                      (a)           determine whether a Member has experienced
                                    an event giving rise to the payment of
                                    benefits hereunder;

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                      (b)           determine whether a Member or a Member's
                                    Beneficiary is entitled to receive benefits
                                    under the Plan;

                      (c)           determine the amount of any benefit payable
                                    hereunder;

                      (d)           interpret the Plan and make all other
                                    determinations and to take all other
                                    actions necessary or advisable for the
                                    implementation and administration of the
                                    Plan, except in respect to the designation
                                    of Members under Section 3.01 or
                                    modification, amendment, or termination of
                                    the Plan under Article VII, which actions
                                    are reserved to the Board;

                      (e)           appoint or employ agents and to delegate
                                    thereto such responsibilities and duties
                                    necessary or appropriate to the effective
                                    administration of the Plan; and

                      (f)           direct the payment of any benefits payable
                                    hereunder from the general assets of the
                                    Company.

         All good faith actions, determinations and decisions of the
         Administrator shall be final, conclusive and binding upon the Company,
         Members and their Beneficiaries. The Administrator shall not be liable
         for any action taken or decision made in good faith relating to the
         Plan.

Article V  -  Benefits

         5.01         Amount of Benefits.  A Member's Accrued Benefit shall be
                      equal to the greater of (i) the monthly benefit earned by
                      the Member under the Plan immediately prior to its
                      amendment and restatement effective February 22, 1996
                      based on service, compensation and other factors then
                      prevailing or (ii) an amount of monthly retirement income
                      payable at the Member's Normal Retirement Date in the
                      form of a single life annuity equal to the Member's
                      Average Monthly Earnings multiplied by the applicable
                      percentage determined in accordance with Appendix A
                      hereto based upon the Member's years of Benefit
                      Calculation Service but reduced by the offsets described
                      in Section 5.02.  If a Member has a fractional year of
                      Benefit Calculation Service, such fraction shall be
                      counted for purposes of determining the "Standard Accrual
                      Rate" but not the "Retroactive Cliff Bonus

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                      Accrual." For example, if a Member has 9.5 years of
                      Benefit Calculation Service, his "Cumulative Accrual"
                      would be 14.25 percent (13.5 percent + [.5 x 1.5
                      percent]).

         5.02         Offsets.  A Member's Accrued Benefit shall be reduced and
                      offset by the following amounts:

                           (a)      the monthly amount of retirement income
                                    payable to the Member under the Salaried
                                    Pension Plan and any other defined benefit
                                    pension plan maintained by the Company or
                                    any of its affiliates or by USX or any of
                                    its affiliates; and

                           (b)      50 percent of the Member's Primary
                                    Insurance Amount.

         5.03         Commencement of Benefits.  The benefits payable under
                      this Plan shall commence to be paid at the same time as
                      benefits are to be paid to the Member or his or her
                      Beneficiary under the Salaried Pension Plan.  If a
                      Member's benefits commence before attainment of age 62,
                      the Member shall be entitled to an amount equal to his
                      Accrued Benefit otherwise determined above reduced by
                      one-half of one percent (1/2 percent) for each month by
                      which his date of benefit commencement precedes the first
                      day of the month coincident with or immediately following
                      the date that the Member will attain age 62.

         5.04         Vesting of Accrued Benefit.

         (a)          A Member shall acquire a fully vested interest in his
                      Accrued Benefit upon his death or attainment of age 65
                      while in the employ of the Company.

         (b)          Whenever the employment of a Member terminates before
                      Retirement and for reasons other than death, he shall be
                      entitled to a nonforfeitable (vested) percentage of his
                      Accrued Benefit, in accordance with the following table,
                      based on his full years of Vesting Service as of the date
                      of termination of employment:



                      Full Years of               Vested Percentage
                      Vesting Service             of Accrued Benefit
                      ---------------             ------------------
                                                  
                      Less than 5 years                0 percent
                      5 years or more                100 percent


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         Notwithstanding the foregoing, upon and following a Change of Control,
         a Participant shall be 100 percent vested in his Accrued Benefit.

         5.05         Distribution of Benefits.  Each Member may elect to
                      receive monthly retirement income in one of the
                      alternative forms listed in Section 5.06.  The timing of
                      such elections shall be in accordance with Section 5.07.
                      Each of the alternative forms shall be the Actuarial
                      Equivalent of the monthly retirement income payable in
                      the single life annuity form.  In the absence of an
                      election as to the form of benefit payment, in the case
                      of a Member who is not married on his annuity starting
                      date, the Member's Accrued Benefit shall be payable in
                      the single life annuity form.  In the absence of an
                      election as to the form of benefit payment, in the case
                      of a Member who is married on his annuity starting date,
                      his Accrued Benefit shall be paid in the form described
                      in Section 5.06(b).

         5.06         Form of Payment. Subject to the limitations of subsection
                      (e) below, the alternative forms of payment available
                      under the Plan for all types of retirement benefits are
                      as follows:

         (a)          Single Life Annuity Form.  A monthly income
                      continuing for the life of the Member.

         (b)          Qualified Joint and Survivor Annuity.  A monthly income
                      payable for the lifetime of the Member and continuing
                      thereafter in an amount fifty percent (50 percent) as
                      large to the Member's spouse for the lifetime of said
                      spouse.

         (c)          Contingent Annuitant Option.  A monthly income payable
                      for the lifetime of the Member and continuing thereafter
                      in an amount fifty percent (50 percent) or one hundred
                      percent (100 percent) as great, as elected by the Member,
                      to a Co-Pensioner designated in writing by the Member for
                      such Co-Pensioner's life.  Should the Co-Pensioner named
                      by the Member die prior to the Member's annuity starting
                      date, this election shall be void and a single life
                      annuity shall be paid as if election of this optional
                      form had never been made.  Should the Co-Pensioner die
                      after payment of the Member's Accrued Benefit has
                      commenced, no alternative Co-Pensioner can be named.

         (d)          Lump Sum Option - A Member may elect, in lieu of the
                      forms of payment set forth in subsections (a), (b) and
                      (c) above, to receive a lump sum distribution of

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                      his vested Accrued Benefit in an amount equal to the
                      Actuarial Equivalent of such vested Accrued Benefit.

         (e)          Limitation. Notwithstanding any other provision of this
                      Plan to the contrary, if an annuity form of distribution
                      is payable to the Member under the terms of the Salaried
                      Pension Plan, then the same form of annuity payout shall
                      be applicable to the Member's Accrued Benefit hereunder.

         5.07         Timing of Benefit Elections.  Each Member shall make his
                      election as to the form of benefit distribution before
                      the later of (i) the Member's 55th birthday and (ii) 30
                      days after the effective date of such Member's initial
                      eligibility under the Plan.  Such election shall be
                      irrevocable except as provided in Section 5.10 and as
                      follows:

         (a)          If the change is made at least 13 months prior to the
                      date of termination of employment, the Member may change
                      his election from any optional benefit form to any other
                      optional benefit form.

         (b)          If the change is not made at least 13 months prior to the
                      date of termination of employment, the Member may change
                      his election from a lump sum to an annuity or from an
                      annuity to a lump sum (but not from one annuity form to
                      another), but in such event the Member shall forfeit ten
                      percent (10 percent) of his Accrued Benefit, determined
                      as of the date the new election is effective.

         5.08         Hardship Withdrawal.  Following Retirement, a Member may,
                      in the event of a Financial Hardship, request a
                      withdrawal of all or a portion of his Accrued Benefit.
                      The request shall be made in a time and manner determined
                      by the Administrative Committee, shall not be for a
                      greater amount than the amount required to meet the
                      Financial Hardship, and shall be subject to approval by
                      the Administrative Committee.

         5.09         Change in Control.  If within two years after the
                      occurrence of a Change in Control either (i) the Plan is
                      terminated or (ii) a Member's employment with the Company
                      is terminated by the Company without Cause, an additional
                      three years will be added to the Member's Benefit
                      Calculation Service for purposes of calculating the
                      Member's Accrued Benefit, except for purposes of
                      determining the Member's eligibility for the 10 percent
                      "Retroactive Cliff Bonus Accrual" at 10 years of Benefit
                      Accrual Service and the 12.5 percent "Retroactive Cliff
                      Bonus Accrual" at 15 years

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                      of Benefit Accrual Service (as described in Appendix A),
                      and the Member's Accrued Benefit so calculated shall be
                      paid to the Member in a lump sum distribution within 30
                      days of the date of termination.

         5.10         Change in Distribution Form.  Following the occurrence of
                      a Change in Control, a Member or Beneficiary who is
                      receiving an annuity benefit shall be entitled to elect
                      to convert such annuity into an immediate lump sum
                      distribution of the Actuarial Equivalent of his Accrued
                      Benefit, as adjusted for any benefit payments made prior
                      to the date of such conversion; provided that, as a
                      condition of such conversion, the Member or Beneficiary,
                      as the case may be, shall forfeit an amount equal to six
                      percent (6 percent) of such lump sum benefit.  If a
                      Change in Control has not occurred, a Member or
                      Beneficiary shall be entitled to elect such a conversion
                      from an annuity to a lump sum, but the forfeited amount
                      shall equal ten percent (10 percent) of the lump sum
                      benefit.


Article VI  -  Survivor Benefits

         6.01         Pre-Retirement Survivor Benefit for Vested Member. In the
                      case of any Member who dies prior to his annuity starting
                      date when he is vested in his Accrued Benefit, the
                      Member's Beneficiary shall be entitled to a survivor
                      benefit, payable as follows:

         (a)          If such Member was eligible to immediately commence
                      receipt of his Accrued Benefit as of the date of his
                      death, such survivor benefit shall be a monthly income
                      payable for the life of the Beneficiary, commencing on
                      the first day of the month immediately following the
                      Member's date of death equal to the benefit that would
                      have been payable to the Beneficiary had the Participant
                      retired on the day before death, and elected immediate
                      commencement of benefits in a joint and 50 percent
                      survivor annuity form under Section 5.06(c). The last
                      monthly payment shall be made for the month in which the
                      death of such Beneficiary occurs.

         (b)          If such Member was not eligible to immediately commence
                      receipt of his Accrued Benefit hereunder as of the date
                      of his death, such survivor benefit shall be a monthly
                      income payable for the life of the Beneficiary, beginning
                      with the first day of the month in which the Member could
                      have elected

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                      immediate benefits had he survived ("earliest
                      commencement date"), equal to the benefit that would have
                      been payable to the Beneficiary had the Member terminated
                      employment on his date of death (except where termination
                      of employment occurred prior to his death, the Member's
                      date of termination of employment shall be used) and then
                      survived and retired on the earliest commencement date
                      and elected immediate commencement of benefits in a joint
                      50 percent and survivor annuity form under Section
                      5.05(c). The last monthly payment shall be made for the
                      month in which the death of such Beneficiary occurs.

         6.02         Post-Retirement Survivor Benefit. When a Member dies
                      after his annuity starting date, his Beneficiary or
                      Co-Pensioner shall be entitled to only such benefits, if
                      any, due under the form of benefit paid to the Member
                      upon his retirement.

Article VII  -  Amendment and Termination

         The Company, by action of the Board, may modify, alter, amend or
         terminate the Plan in whole or in part, except to the extent that such
         action would result in the reduction of the Accrued Benefit of any
         Member. Notwithstanding the foregoing, the Company may not amend or
         terminate the Plan within two (2) years following a Change in Control
         without the consent of a majority of the Participants.

Article VIII  -  Miscellaneous

         8.01         Withholding.  The Member or the Beneficiary shall make
                      appropriate arrangements with the Company for
                      satisfaction of any federal, state or local income tax
                      withholding requirements and Social Security or other
                      employee tax requirements applicable to the payment of
                      benefits under the Plan.  If no other arrangements are
                      made, the Company may provide, at its discretion, for
                      such withholding and tax payments as may be required.

         8.02         Unsecured General Creditor.  The rights of a Member or
                      his or her Beneficiary to receive payment of any benefits
                      under the Plan shall be and remain no greater than the
                      rights of an unsecured general creditor of the Company.
                      In the event the Company establishes a trust, which it
                      may but shall not be required to do, to hold money or
                      other property of the Company in contemplation of paying
                      benefits under

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                      the Plan, such money or other property shall remain
                      subject to the claims of creditors of the Company.

         8.03         Nonassignability.  Neither a Member nor any other person
                      shall have any right to commute, sell, assign, transfer,
                      pledge, anticipate, mortgage or otherwise encumber,
                      transfer, hypothecate or convey in advance of actual
                      receipt that amounts, if any payable hereunder, or any
                      part thereof, which are, and all rights to which are,
                      expressly declared to be unassignable and
                      nontransferable.  No part of the amounts payable shall,
                      prior to actual payment, be subject to seizure or
                      sequestration for the payment of any debts, judgments,
                      alimony or separate maintenance owed by a Member or any
                      other person, nor be transferable by operation of law in
                      the event of a Member's or any other person's bankruptcy
                      or insolvency.

         8.04         Not a Contract of Employment.  The terms and conditions
                      of this Plan shall not be deemed to constitute a contract
                      of employment between the Company and the Member, and the
                      Member (or his or her Beneficiary) shall have no rights
                      against the Company except as may be specifically
                      provided herein.  Moreover, nothing in this Plan shall be
                      deemed to give a Member the right to be retained in the
                      service of the Company or to interfere with the right of
                      the Company to discharge him or change his employment
                      status at any time.

         8.05         Not a Bar to Corporate Act.  Nothing contained in the
                      Plan shall prevent the Company from engaging in any
                      reorganization, recapitalization, merger, liquidation,
                      sale of assets or other corporate transaction.

         8.06         Terms.  Whenever any words are used herein in the
                      masculine, they shall be construed as though they were
                      used in the feminine in all cases where they would so
                      apply; and wherever any words are used herein in the
                      singular or in the plural, they shall be construed as
                      though they were used in the plural or the singular, as
                      the case may be, in all cases where they would so apply.

         8.07         Captions. The captions of the articles, sections and
                      paragraphs of this Plan are for convenience only and
                      shall not control or affect the meaning or construction
                      of any of its provisions.

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         8.08         Governing Laws.  The provisions of this Plan shall be
                      construed and interpreted according to the internal laws
                      of the Commonwealth of Pennsylvania.

         8.09         Severability. In case any provision of this Plan shall be
                      held illegal or invalid for any reason, said illegality
                      or invalidity shall not affect the remaining parts
                      hereof, but this Plan shall be construed and enforced as
                      if such illegal and invalid provision had never been
                      inserted herein.

         8.10         Notice.  Any notice or filing required or permitted to be
                      given to the Company under the Plan shall be sufficient
                      if in writing and hand delivered, or sent by registered
                      or certified mail, to the principal office of the
                      Company.  Such notice shall be deemed given as of the
                      date of delivery or, if delivery is made by mail, as of
                      the date shown on the postmark on the receipt for
                      registration or certification.  Contact should be made
                      with:

                          Supplemental Plan
                           Administrator
                          c/o Chief Financial Officer
                          Aristech Chemical Corporation
                          600 Grant Street
                          Pittsburgh, PA  15230

         8.11         Successor.  The provisions of the Plan shall be binding
                      on the Company and its successors and assigns.  The term
                      successors as used herein shall include any corporate or
                      other business entity which shall, whether by merger,
                      consolidation, purchase or otherwise acquire all or
                      substantially all of the business and assets of the
                      Company, and successors of any such corporation or other
                      business entity.

         8.12         Executive Committee Action.  The Executive Committee of
                      the Board shall be authorized to take any action that is
                      within the authority of the Board under this Plan.

Article IX  -  Execution

         In order to record the due adoption of this Plan, as restated
         effective February 22, 1996, the Company has caused the execution
         hereof by its authorized officers, as of the 22nd day of February,
         1996.

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                                          ARISTECH CHEMICAL CORPORATION

ATTEST:

By:____________________________           By:______________________
    General Counsel & Secretary              Chairman of the Board
                                              and Chief Executive
                                              Officer

                                     - 14 -


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                                   APPENDIX A
                                   ----------



====================================================================================================================================
        YEARS OF                       STANDARD                           RETROACTIVE
        BENEFIT                         ACCRUAL                           CLIFF BONUS                         CUMULATIVE
      CALCULATION                        RATE                               ACCRUAL                            ACCRUAL
        SERVICE                                                                                                                     
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                    
           1                          1.5 percent                          0 percent                          1.5 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           2                          1.5 percent                          0 percent                          3.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           3                          1.5 percent                          0 percent                          4.5 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           4                          1.5 percent                          0 percent                          6.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           5                          1.5 percent                          0 percent                          7.5 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           6                          1.5 percent                          0 percent                          9.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           7                          1.5 percent                          0 percent                         10.5 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           8                          1.5 percent                          0 percent                         12.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           9                          1.5 percent                          0 percent                         13.5 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           10                         1.5 percent                         10.0 percent                       25.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           11                         1.5 percent                          0 percent                         26.5 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           12                         1.5 percent                          0 percent                         28.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           13                         1.5 percent                          0 percent                         29.5 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           14                         1.5 percent                          0 percent                         31.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           15                         1.5 percent                         12.5 percent                       45.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           16                         1.0 percent                          0 percent                         46.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           17                         1.0 percent                          0 percent                         47.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           18                         1.0 percent                          0 percent                         48.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           19                         1.0 percent                          0 percent                         49.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           20                         1.0 percent                          0 percent                         50.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           21                         1.0 percent                          0 percent                         51.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           22                         1.0 percent                          0 percent                         52.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           23                         1.0 percent                          0 percent                         53.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           24                         1.0 percent                          0 percent                         54.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           25                         1.0 percent                          0 percent                         55.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           26                         1.0 percent                          0 percent                         56.0 percent
- ------------------------------------------------------------------------------------------------------------------------------------



   17




                                                                                                    
- ------------------------------------------------------------------------------------------------------------------------------------
           27                         1.0 percent                          0 percent                         57.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           28                         1.0 percent                          0 percent                         58.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           29                         1.0 percent                          0 percent                         59.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------
           30*                        1.0 percent                          0 percent                         60.0 percent           
- ------------------------------------------------------------------------------------------------------------------------------------


* and continuing at the rate of 1 percent for each full year of Benefit
  Calculation Service in excess of 30.