Document:

Exhibit 10.6.

                    QUESTAR MARKET RESOURCES, INC.
               DEFERRED COMPENSATION PLAN FOR DIRECTORS
                (As Amended and Restated May 19, 1998)

 1.  Purpose of Plan.

      The purpose of the Deferred Compensation Plan for Directors
     ("Plan") is to provide Directors of Questar Market Resources,
     Inc. (the "Company") with an opportunity to defer compensation
     paid to them for their services as Directors of the Company and
     to maintain a Deferred Account Balance until they cease to
     serve as Directors of the Company or its affiliates.

 2.  Eligibility.

      Subject to the conditions specified in this Plan or otherwise
     set by the Company's Board of Directors, all voting Directors
     of the Company who receive compensation for their service as
     Directors are eligible to participate in the Plan.  Eligible
     Directors are referred to as "Directors."  Directors who elect
     to defer receipt of fees or who have account balances are
     referred to as "Participants" in this Plan.

 3.  Administration.

      The Company's Board of Directors shall administer the Plan and
     shall have full authority to make such rules and regulations
     deemed necessary or desirable to administer the Plan and to
     interpret its provisions.

 4.  Election to Defer Compensation.

          (a)  Time of Election.  A Director can elect to defer
     future compensation or to change the nature of his election for
     future compensation by submitting a notice prior to the
     beginning of the calendar year.  A newly elected Director is
     entitled to make a choice within five days of the date of his
     election or appointment to serve as a Director to defer payment
     of compensation for future service.  An election shall continue
     in effect until the termination of the Participant's service as
     a Director or until the end of the calendar year during which
     the Director serves written notice of the discontinuance of his
     election.

      All notices of election, change of election, or discontinuance
     of election shall be made on forms prepared by the Corporate
     Secretary and shall be dated, signed, and filed with the
     Corporate Secretary.  A notice of change of election or
     discontinuance of election shall operate prospectively from the
     beginning of the calendar year, but any compensation deferred
     shall continue to be held and shall be paid in accordance with
     the notice of election under which it was withheld.

      (b) Amount of Deferral.  A Participant may elect to defer
     receipt of all or a specified portion of the compensation
     payable to him for serving as a Director and attending Board
     and Committee Meetings as a Director.  For purposes of this
     Plan, compensation does not include any funds paid to a
     Director to reimburse him for expenses.

      (c) Period of Deferral.  When making an election to defer all
     or a specified percentage of his compensation, a Participant
     shall elect to receive the deferred compensation in a lump sum
     payment within 45 days following the end of his service as a
     Director or in a number of annual installments (not to exceed
     four), the first of which would be payable within 45 days
     following the end of his service as a Director with each
     subsequent payment payable one year thereafter.  Under an
     installment payout, the Participant's first installment shall
     be equal to a fraction of the balance in his Deferred
     Compensation Account as of the last day of the calendar month
     preceding such payment, the numerator of which is one and the
     denominator of which is the total number of installments
     selected.  The amount of each subsequent payment shall be a
     fraction of the balance in the Participant's Account as of the
     last day of the calendar month preceding each subsequent
     payment, the numerator of which is one and the denominator of
     which is the total number of installments elected minus the
     number of installments previously paid.  The term "balance," as
     used herein, refers to the amount credited to a Participant's
     Account or to the Fair Market Value (as defined in Section 5
     (a)) of the Phantom Shares of Questar Corporation's common
     stock ("Common Stock") credited to his Account.

      (d) Phantom Stock Option and Certificates of Deposit Option.
     When making an election to defer all or a specified percentage
     of his compensation, a Participant shall choose between two
     methods of determining earnings on the deferred compensation.
     He may choose to have such earnings calculated as if the
     deferred compensation had been invested in Common Stock at the
     Fair Market Value (as defined in Section 5 (a)) of such stock
     as of the date such compensation amount would have otherwise
     been payable to him ("Phantom Stock Option").  Or he may choose
     to have earnings calculated as if the deferred compensation had
     been invested in negotiable certificates of deposit at the time
     such compensation would otherwise be payable to him
     ("Certificates of Deposit Option").

      The Participant must choose between the two options for all of
     the compensation he elects to defer in any given year.  He may
     change the option for future compensation by filing the
     appropriate notice with the Corporate Secretary before the
     first day of each calendar year, but such change shall not
     affect the method of determining earnings for any compensation
     deferred in a prior year.

 5.  Deferred Compensation Account.

      A Deferred Compensation Account ("Account") shall be
     established for each Participant.

      (a) Phantom Stock Option Account.  If a Participant elects the
     Phantom Stock Option, his Account will include the number of
     shares and partial shares of Common Stock (to four decimals)
     that could have been purchased on the date such compensation
     would have otherwise been payable to him.  The purchase price
     for such stock is the Fair Market Value of such stock, i.e.,
     the closing price of such stock as reported on the Composite
     Tape of the New York Stock Exchange for such date or the next
     preceding day on which sales took place if no sales occurred on
     the actual payable date.

          The Participant's Account shall also include the dividends
     that would have become payable during the deferral period if
     actual purchases of Common Stock had been made, with such
     dividends treated as if invested in Common Stock as of the
     payable date for such dividends.

      (b) Certificates of Deposit Option Account.  If a Participant
     elects the Certificates of Deposit Option, his Account will be
     credited with any compensation deferred by the Participant at
     the time such compensation would otherwise be payable and with
     interest calculated at a monthly rate using the typical rates
     paid by major banks on new issues of negotiable Certificates of
     Deposit on amounts of $1,000,000 or more for one year as quoted
     in The Wall Street Journal under "Money Rates" on the first day
     of the relevant calendar month or the next preceding business
     day if the first day of the month is a non-business day.  The
     interest credited to each Account shall be based on the amount
     held in the Account at the beginning of each particular month.

 6.  Statement of Deferred Compensation Account.

          Within 45 days after the end of the calendar year, a
     statement will be sent to each Participant listing the balance
     in his Account as of the end of the year.

 7.  Retirement.

          Upon retirement or resignation as a Director from the
     Board of Directors, a Participant shall receive payment of the
     balance in his Account in accordance with the terms of his
     prior instructions and the terms of the Plan unless he is still
     serving as a voting director of Questar Corporation
     ("Questar").  Upon retirement or resignation as a Director of
     Questar or upon appointment as a non-voting Senior Director of
     Questar, a Participant shall receive payment of the balance in
     his Account in accordance with the terms of his prior
     instructions and the terms of the Plan unless he is currently
     serving as a Director of the Company.

 8.  Payment of Deferred Compensation.

      (a) Phantom Stock Option.  The amount payable to the
     Participant choosing the Phantom Stock Option shall be the cash
     equivalent of the stock using the Fair Market Value of such
     stock on the date of withdrawal.

      (b) Certificates of Deposit Option.  The amount payable to the
     Participant choosing the Certificate of Deposit Option shall
     include the interest on all sums credited to the Account, with
     such interest credited to the date of withdrawal.

      (c) The date of withdrawal for both the Phantom Stock Option
     Account and the Certificates of Deposit Option Account shall be
     the last day of the calendar month preceding payment or if
     payment is made because of death, the date of death.

      (d)  The payment shall be made in the manner (lump sum or
     installment) chosen by the Participant.  In the event of a
     Participant's death, payment shall be made within 45 days of
     the Participant's death to the beneficiary designated by the
     Participant or, in the absence of such designation, to the
     Participant's estate.

 9.  Payment, Change in Control.

          Notwithstanding any other provisions of this Plan or
     deferral elections made pursuant to Section 4 of this Plan, a
     Director, in the event of a Change in Control of Questar, shall
     be entitled to elect a distribution of his account balance
     within 60 days following the date of a Change in Control.  For
     the purpose of this Plan, a "Change in Control" shall be deemed
     to have occurred if (i) any "Acquiring Person" (as that term is
     used in the Rights Agreement dated February 13, 1996, between
     Questar and ChaseMellon Shareholder Services, L.L.C. ("Rights
     Agreement")) is or becomes the beneficial owner (as such term
     is used in Rule 13d-3 under the Securities Exchange Act of
     1934) of securities of Questar representing 25 percent or more
     of the combined voting power of Questar, or (ii) the following
     individuals cease for any reason to constitute a majority of
     the number of directors then serving as directors of Questar:
     individuals who, as of May 19, 1998, constitute Questar's Board
     of Directors ("Board") and any new director (other than a
     director whose initial assumption of office is in connection
     with an actual or threatened election contest, including but
     not limited to a consent solicitation, relating to the election
     of directors of Questar) whose appointment of election by the
     Board or nomination for election by Questar's stockholders was
     approved or recommended by a vote of at least two-thirds of the
     directors when still in office who either were directors on May
     19, 1998, or who appointment, election or nomination for
     election was previously so approved or recommended; or (iii
     Questar stockholders approve a merger or consolidation of
     Questar or any direct of indirect subsidiary of Questar with
     any other corporation, other than a merger of consolidation
     that would result in the voting securities of Questar
     outstanding immediately prior to such merger or consolidation
     continuing to represent (either by remaining outstanding or by
     being converted into voting securities of the surviving entity
     or any parent thereof) at least 60 percent of the combined
     voting power of the securities of Questar or such surviving
     entity or its parent outstanding immediately after such merger
     or consolidation, or a merger or consolidation effected to
     implement a recapitalization of Questar (or similar
     transaction) in which no person is or becomes the beneficial
     owner, directly or indirectly, of securities of Questar
     representing 25 percent or more of the combined voting power of
     Questar's then outstanding securities; or (iv) Questar's
     stockholders approve a plan of complete liquidation or
     dissolution of the Company or there is consummated an agreement
     for the sale or disposition by Questar of all or substantially
     all of Questar's assets, other than a sale of disposition by
     Questar of all or substantially all of the Company's assets to
     an entity, at least 60 percent of the combined voting power of
     the voting securities of which are owned by stockholders of
     Questar in substantially the same proportion as their ownership
     of Questar immediately prior to such sale.  A Change in
     Control, however, shall not be considered to have occurred
     until all conditions precedent to the transaction, including
     but not limited to, all required regulatory approvals have been
     obtained.

10.  Hardship Withdrawal.

      Upon petition to and approval by the Company's Board of
     Directors, a Participant may withdraw all or a portion of the
     balance in his Account in the case of financial hardship in the
     nature of an emergency, provided that the amount of such
     withdrawal cannot exceed the amount reasonable necessary to
     meet the financial hardship.  The Board of Directors shall have
     sole discretion to determine the circumstances under which such
     withdrawals are permitted.

11.  Amendment and Termination of Plan.

      The Plan may be amended, modified or terminated by the
     Company's Board of Directors.  No amendment, modification, or
     termination shall adversely affect a Participant's rights with
     respect to amounts accrued in his Account.  In the event that
     the Plan is terminated, the Board of Directors has the right to
     make lump-sum payments of all Account balances on such date as
     it may determine.

12.  Nonassignability of Plan.

      The right of a Participant to receive any unpaid portion of
     his Account shall not be assigned, transferred, pledged or
     encumbered or be subject in any manner to alienation or
     attachment.

13.  No Creation of Rights.

      Nothing in this Plan shall confer upon any Participant the
     right to continue as a Director.  The right of a Participant to
     receive any unpaid portion of his Account shall be an unsecured
     claim against the general assets and will be subordinated to
     the general obligations of the Company.

14.  Effective Date.

      The Plan was effective on June 1, 1982, and shall remain in
     effect until it is discontinued by action of the Company's
     Board of Directors.  The effective date of the amendment to the
     Plan establishing a Phantom Stock Option is January 1, 1983.
     The Plan was amended and restated effective April 30, 1991, was
     amended and restated effective February 13, 1996, and was
     further amended and restated effective May 19, 1998.<PAGE>

                                                          Executed in 6 Parts
                                                          Counterpart No. (   )

                              NATIONAL EQUITY TRUST

                           OTC GROWTH TRUST SERIES 10

                            REFERENCE TRUST AGREEMENT

         This Reference Trust Agreement dated November 8, 2000 among Prudential
Securities Incorporated, as Depositor and The Chase Manhattan Bank, as Trustee,
sets forth certain provisions in full and incorporates other provisions by
reference to the document entitled "National Equity Trust Low Five Portfolio
Series, Trust Indenture and Agreement" (the "Basic Agreement") dated April 25,
1995. Such provisions as are set forth in full herein and such provisions as are
incorporated by reference constitute a single instrument (the "Indenture").

                                WITNESSETH THAT:
                                ----------------

         In consideration of the premises and of the mutual agreements herein
contained, the Depositor and the Trustee agree as follows:

                                     Part I.
                                     ------

                     STANDARD TERMS AND CONDITIONS OF TRUST

         Subject to the provisions of Part II hereof, all the provisions
contained in the Basic Agreement are herein incorporated by reference in their
entirety and shall be deemed to be a part of this instrument as fully and to the
same extent as though said provisions had been set forth in full in this
instrument except that the Basic Agreement is hereby amended in the following
manner:

<PAGE>

                                      -2-

A.       Article I, entitled "Definitions", paragraph 22, shall be amended as
         follows:

         "Trustee shall mean The Chase Manhattan Bank or any successor trustee
         appointed as hereinafter provided."

B.       Article II, entitled "Deposit of Securities; Acceptance of Trust",
         shall be amended as follows:

         The second sentence of Section 2.03 Issue of Units shall be amended by
         deleting the words "on any day on which the Depositor is the only Unit
         Holder."

C.       Article III, entitled "Administration of Trust", shall be amended as
         follows:

         (i)      Section 3.01 Initial Costs shall be amended to substitute the
                  following language:

                  Section 3.01. Initial Cost  The costs of organizing the Trust
                  and sale of the Trust Units shall, to the extent of the
                  expenses reimbursable to the Depositor provided below, be
                  borne by the Unit Holders, provided, however, that, to the
                  extent all of such costs are not borne by Unit Holders, the
                  amount of such costs not borne by Unit Holders shall be borne
                  by the Depositor and, provided further, however, that the
                  liability on the part of the Depositor under this section
                  shall not include any fees or other expenses incurred in
                  connection with the administration of the Trust subsequent to
                  the deposit referred to in Section 2.01. Upon notification
                  from the Depositor that the primary offering period is
                  concluded, the Trustee shall withdraw from the Account or
                  Accounts specified in the Prospectus or, if no Account is
                  therein specified, from the Principal Account, and pay to the
                  Depositor the Depositor's reimbursable expenses of organizing
                  the Trust and sale of the Trust Units in an amount certified
                  to the Trustee by the Depositor. If the balance of the
                  Principal Account is insufficient to make such withdrawal, the
                  Trustee shall, as directed by the Depositor, sell Securities
                  identified by the

<PAGE>

                                      -3-

                  Depositor, or distribute to the Depositor Securities having a
                  value, as determined under Section 4.01 as of the date of
                  distribution, sufficient for such reimbursement. The
                  reimbursement provided for in this section shall be for the
                  account of the Unitholders of record at the conclusion of the
                  primary offering period and shall not be reflected in the
                  computation of the Unit Value prior thereto. As used herein,
                  the Depositor's reimbursable expenses of organizing the Trust
                  and sale of the Trust Units shall include the cost of the
                  initial preparation and typesetting of the registration
                  statement, prospectuses (including preliminary prospectuses),
                  the indenture, and other documents relating to the Trust, SEC
                  and state blue sky registration fees, the cost of the initial
                  valuation of the portfolio and audit of the Trust, the initial
                  fees and expenses of the Trustee, and legal and other out-
                  of-pocket expenses related thereto, but not including the
                  expenses incurred in the printing of preliminary prospectuses
                  and prospectuses, expenses incurred in the preparation and
                  printing of brochures and other advertising materials and any
                  other selling expenses. Any cash which the Depositor has
                  identified as to be used for reimbursement of expenses
                  pursuant to this Section shall be reserved by the Trustee for
                  such purpose and shall not be subject to distribution or,
                  unless the Depositor otherwise directs, used for payment of
                  redemptions in excess of the per-Unit amount allocable to
                  Units tendered for redemption. As directed by the Depositor,
                  the Trustee will advance funds to the Trust in an amount
                  necessary to reimburse the Depositor pursuant to this Section
                  and shall recover such advance from the sale or sales of
                  Securities at such time as the Depositor shall direct, but in
                  no event later than the termination of the Trust. Repayment of
                  any such advance shall be secured by a lien on the assets of
                  the Trust prior to the interest of the Unit Holders as
                  provided in Section 6.04.

         (ii)     The third paragraph of Section 3.05 Distribution shall be
                  amended to add the following sentence at the end thereof:

                  "The Trustee shall make a special distribution of the cash
                  balance in the Income and Principal accounts available for
                  such distribution to Unit

<PAGE>

                                      -4-

                  Holders of record on such dates as the Depositor shall
                  direct."

         (iii)    The second to the last paragraph of Section 3.08 Sale of
                  Securities shall be amended to replace the word "equal" with
                  the following phrase: "be sufficient to pay."

         (iv)     Section 3.14 Deferred Sales Charge shall be amended to add the
                  following sentences at the end thereof:

                  "References to Deferred Sales Charge in this Trust Indenture
                  and Agreement shall include any Creation and Development Fee
                  indicated in the prospectus for a Trust. The Creation and
                  Development Fee shall be payable on each date so designated
                  and in an amount determined as specified in the prospectus for
                  a Trust."

D.       Reference to United States Trust Company of New York in its capacity as
         Trustee is replaced by the Chase Manhattan Bank throughout the Basic
         Agreement.

E.       Section 6.05 shall be amended to delete the clause "if the Depositor
         shall determine in good faith that there has occurred either (1) a
         material deterioration in the creditworthiness of the Trustee or (2)
         one or more negligent acts on the part of the Trustee having a
         materially adverse effect, either singly or in the aggregate, on the
         Trust or on one or more Trusts, such that the replacement of the
         Trustee is in the best interest of the Unit Holders" and insert in
         place thereof "upon the determination of the Depositor to remove the
         Trustee for any reason, either with or without cause, including but not
         limited to a determination by the Depositor that the Trustee has
         materially failed to perform its duties under the Indenture and the
         interest of Unit Holders has been substantially impaired as a result".

                                    Part II.
                                    -------

                      SPECIAL TERMS AND CONDITIONS OF TRUST

         The following special terms and conditions are hereby agreed to:

<PAGE>

                                      -5-

                  A. The Trust is denominated National Equity Trust, OTC Growth
         Trust Series 10.

                  B. The Units of the Trust shall be subject to a deferred sales
         charge.

                  C. The contracts for the purchase of common stock listed in
         Schedule A hereto are those which, subject to the terms of this
         Indenture, have been or are to be deposited in Trust under this
         Indenture as of the date hereof.

                  D. The term "Depositor" shall mean Prudential Securities
         Incorporated.

                  E. The aggregate number of Units referred to in Sections 2.03
         and 9.01 of the Basic Agreement is 125,000 as of the date hereof.

                  F. A Unit of the Trust is hereby declared initially equal to
         1/125,000th of the Trust.

                  G. The term "First Settlement Date" shall mean
         November 14, 2000.

                  H. The terms "Computation Day" and "Record Date" shall be on
         such dates as the Sponsor shall direct.

                  I. The term "Distribution Date" shall be on such dates as the
         Sponsor shall direct.

                  J. The term "Termination Date" shall mean December 18, 2001.

                  K. The Trustee's Annual Fee shall be $1.16 (per 1,000 Units)
         for 100,000,000 and above units outstanding; $1.22 (per 1,000 Units)
         for 50,000,000 - 99,999,999 units outstanding; $1.26 (per 1,000 Units)
         for 49,999,999 and below units outstanding. In calculating the
         Trustee's annual fee, the fee applicable to the number of units
         outstanding shall apply to all units outstanding.

                  L. The Depositor's Portfolio supervisory service fee shall be
         $0.25 per 1,000 Units.

               [Signatures and acknowledgments on separate pages]
<PAGE>

                                      -6-

         The Schedule of Portfolio Securities in Part A of the prospectus
         included in this Registration Statement for National Equity Trust, OTC
         Growth Trust Series 10 is hereby incorporated by reference herein as
         Schedule A hereto.

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