QUESTAR CORPORATION
                   LONG-TERM STOCK INCENTIVE PLAN
               (As Amended and Restated May 19, 1998)

Section 1.  Purpose

     The Questar Corporation Long-Term Stock Incentive Plan (the 
"Plan") is designed to encourage officers and selected key employees 
of and consultants to Questar Corporation and its affiliated companies 
(the "Company") to acquire a proprietary interest in the Company, to 
generate an increased incentive to contribute to the Company's future 
growth and success, and to enhance the Company's ability to attract 
and retain talented officers and employees.  Accordingly, the Company, 
during the term of this Plan, may grant incentive stock options, 
nonqualified stock options, stock appreciation rights, restricted 
stock, performance shares, and other awards valued in whole or in part 
by reference to the Company's stock.

Section 2.  Definitions

     "Affiliate" shall mean any business entity in which the Company 
directly or indirectly has an equity interest deemed significant by 
the Company's Board of Directors. 

     "Approved Retirement" shall mean any retirement of service on or 
after age 60 or, with approval of the Board, early retirement under 
the Company's Retirement Plan.

     "Award" shall mean a grant or award under Section 6 through 10, 
inclusive, of the Plan, as evidenced in a written document delivered 
to a Participant as provided in Section 12(b).

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

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

     "Committee" shall mean the Management Performance Committee of 
the Board of Directors.

     "Common Stock" or "Stock" shall mean the Common Stock, no par 
value, of the Company.  The term shall also include any Common Stock 
Purchase Rights attached to the Common Stock.

     "Company" shall mean Questar Corporation on a consolidated basis.

     "Designated Beneficiary" shall mean the beneficiary designated by 
the Participant, in a manner determined by the Committee, to receive 
amounts due the Participant in the event of the Participant's death.  
In the absence of an effective designation by the Participant, 
Designated Beneficiary shall mean the Participant's estate.

     "Disability" shall mean permanent and total disability within the 
meaning of Section 105(d)(4) of the Code.

     "Employee" shall mean any officer or key employee of or 
consultant to the Employer.

     "Employer" shall mean the Company and any Affiliate.

     "Fair Market Value" shall mean the closing price of the Company's 
Common Stock reported on the New York Stock Exchange on the date in 
question, or, if the Common Stock shall not have been traded on such 
date, the closing price on the next preceding day on which a sale 
occurred.

     "Family Member" shall mean the Participant's spouse, children, 
grandchildren, parents, siblings, nieces and nephews.

     "Fiscal Year" shall mean the fiscal year of the Company.

     "Incentive Stock Option" shall mean a stock option granted under 
Section 6 that is intended to meet the requirements of Section 422 of 
the Code.

     "Nonqualified Stock Option" shall mean a stock option granted 
under Section 6 that is not intended to be an Incentive Stock Option.

     "Option" shall mean an Incentive Stock Option or a Nonqualified 
Stock Option.

     "Participant" shall mean an Employee who is selected by the 
Committee to receive an Award under the Plan.

     "Payment Value" shall mean the dollar amount assigned to a 
Performance Share which shall be equal to the Fair Market Value of the 
Common Stock on the day of the Committee's determination under Section 
8(c)(2) with respect to the applicable Performance Period.

     "Performance Period" or "Period" shall mean the period of years 
selected by the Committee during which the performance is measured for 
the purpose of determining the extent to which an Award of Performance 
Shares has been earned.

     "Performance Goals" shall mean the objectives established by the 
Committee for a Performance Period, for the purpose of determining the 
extent to which Performance Shares that have been contingently awarded 
for such Period are earned.

     "Performance Share" shall mean an Award granted pursuant to 
Section 8 of the Plan expressed as a share of Common Stock.

     "Restricted Period" shall mean the period of years selected by 
the Committee during which a grant of Restricted Stock or Restricted 
Stock Units may be forfeited to the Company.

     "Restricted Stock" shall mean shares of Common Stock contingently 
granted to a Participant under Section 9 of the Plan.

     "Restricted Stock Unit" shall mean a fixed or variable dollar 
denominated unit contingently awarded under Section 9 of the Plan.

     "Right" shall mean a Stock Appreciation Right granted under 
Section 7.

     "Stock Unit Award" shall mean an Award of Common Stock or units 
granted under Section 10.

     "Termination of Employment" shall mean the date on which a 
Participant actually notifies his/her supervisor of his/her 
resignation, in the case of a voluntary termination; and the date on 
which the Company actually notifies the Participant of his/her 
termination, in the case of an involuntary termination.  This term, as 
defined, does not include termination of employment as the result of 
an Approved Retirement, Disability, or death.

Section 3.  Administration

     The Plan shall be administered by the Committee.  The Committee 
shall have sole and complete authority to adopt, alter and repeal such 
administrative rules, guidelines and practices governing the operation 
of the Plan, and to interpret the terms and provisions of the Plan.  
The Committee's decisions shall be binding upon all persons, including 
the Company, stockholders, an Employer, Employees, Participants and 
Designated Beneficiaries.

Section 4.  Eligibility

     Awards may only be granted to officers and key employees of or 
consultants to the Company or any Affiliate who have the capacity to 
contribute to the success of the Company.  When selecting Participants 
and making Awards, the Committee may consider such factors as the 
Employee's functions and responsibilities and the Employee's past, 
present and future contributions to the Company's profitability and 
growth.

     Neither the members of the Committee nor any member of the Board 
who is not an Employee of the Company shall be eligible to receive 
awards.

     Nothing contained in the Plan or in any individual agreement 
pursuant to the terms of the Plan shall confer upon any Participant 
any right to continue in the employment of the Company or to limit in 
any respect the right of the Company to terminate the Participant's 
employment at any time and for any reason.

Section 5.  Maximum Amount Available for Awards and Maximum Award

     The aggregate number of shares of Common Stock that may be issued 
under Awards pursuant to this Plan on an annual basis shall not exceed 
one percent (1%) of the issued and outstanding shares of Common Stock 
as of the first day of each calendar year for which the Plan is in 
effect.  Any shares available in any year using this formula that are 
not granted under this Plan or other plans in which stock is awarded 
to Employees would be available for use in subsequent years.  Shares 
of Common Stock may be made available from the authorized but unissued 
shares of the Company or from shares reacquired by the Company, 
including shares purchased in the open market.  In the event that an 
Option or Right expires or is terminated unexercised as to any shares 
of Common Stock covered thereby, or any Award in respect of shares is 
forfeited for any reason under the Plan, such shares, to the extent 
not precluded by applicable law or regulation, shall be again 
available for Awards pursuant to the Plan.

     In the event that the Committee shall determine that any stock 
dividend, extraordinary cash dividend, recapitalization, 
reorganization, merger, consolidation, split-up, spin-off, 
combination, exchange of shares, warrants or rights offering to 
purchase Common Stock at a price substantially below fair market value 
or other similar corporate event affects the Common Stock such that an 
adjustment is required in order to preserve the benefits or potential 
benefits intended to be made available under this Plan, then the 
Committee, in its sole discretion, may take action.  The Committee may 
adjust any or all of the number and kind of shares that thereafter may 
be awarded or optioned and sold or made the subject of Rights under 
the Plan, the number and kind of shares subject to outstanding Options 
and other Awards, and the grant, exercise or conversion price with 
respect to any of the foregoing and/or, if deemed appropriate, make 
provision for a cash payment to a Participant or a person who has an 
outstanding Option or other Award.  

     There is a maximum of 100,000 shares that can be the subject of 
Awards granted to any single Participant in any given fiscal year.

Section 6.  Stock Options

     (a)  Grant.  Subject to the provisions of the Plan, the Committee 
shall have sole and complete authority to determine the Employees to 
whom Options shall be granted, the number of shares to be covered by 
each Option, the option price therefor and the conditions and 
limitations, applicable to the exercise of the Option.  The Committee 
shall have the authority to grant Incentive Stock Options, 
Nonqualified Stock Options, or both types of Options.  In the case of 
Incentive Stock Options, the terms and conditions of such grants shall 
be subject to and comply with such rules as may be prescribed by 
Section 422 of the Code and any implementing regulations.

     (b)  Option Price.  The Committee shall establish the option 
price at the time each Option is granted, which price shall not be 
less than 100 percent of the Fair Market Value of the Common Stock on 
the date of grant.

     (c)  Exercise.  Each Option shall be exercisable at such times 
and subject to such terms and conditions as the Committee, in its sole 
discretion, may specify in the applicable Award or thereafter; 
provided, however, that in no event may any Option granted hereunder 
be exercisable earlier than six months after the date of such grant or 
after the expiration of ten years from the date of such grant.  The 
Committee may impose such conditions with respect to the exercise of 
Options, including without limitation, any conditions relating to the 
application of federal or state securities laws, as it may deem 
necessary or advisable.

     No shares shall be delivered pursuant to any exercise of an 
Option until payment in full of the option price is received by the 
Company.  Such payment may be made in cash, or its equivalent, or, if 
and to the extent permitted by the Committee, by exchanging shares of 
Common Stock owned by the optionee (which are not the subject of any 
pledge or other security interest), or by a combination of the 
foregoing, provided that the combined value of all cash and cash 
equivalents and the Fair Market Value of any such Common Stock so 
tendered to the Company, valued as of the date of such tender, is at 
least equal to such option price.

     (d)  Transferability.  Participants are allowed to transfer 
vested Nonqualified Stock Options to Family Members or family trusts, 
provided that such options were granted as of and after February 10, 
1998 and provided that such transfers are made and transferred Options 
are exercised in accordance with procedural rules adopted by the 
Committee.

Section 7.  Stock Appreciation Rights

     (a)  The Committee may, with sole and complete authority, grant 
Rights in tandem with an Option.  Rights shall not be exercisable 
earlier than six months after grant, shall not be exercisable after 
the expiration of ten years from the date of grant and shall have an 
exercise price of not less than 100 percent of the Fair Market Value 
of the Common Stock on the date of grant.

     (b)  A Right shall entitle the Participant to receive from the 
Company an amount equal to the excess of the Fair Market Value of a 
share of Common Stock on the exercise of the Right over the grant 
price thereof.  The Committee shall determine whether such Right shall 
be settled in cash, shares of Common Stock or a combination of cash 
and shares of Common Stock.

Section 8.  Performance Shares

     (a)  The Committee shall have sole and complete authority to 
determine the Employees who shall receive Performance Shares and the 
number of such shares for each Performance Period and to determine the 
duration of each Performance Period and the value of each Performance 
Share.  There may be more than one Performance Period in existence at 
any one time, and the duration of Performance Periods may differ from 
each other.

     (b)  Once the Committee decides to use Performance Shares, it 
shall establish Performance Goals for each Period on the basis of 
criteria selected by it.  During any Period, the Committee may adjust 
the Performance Goals for such Period as it deems equitable in 
recognition of unusual or non-recurring events affecting the Company, 
changes in applicable tax laws or accounting principles, or such other 
factors as the Committee may determine.

     (c)  As soon as practicable after the end of a Performance 
Period, the Committee shall determine the number of Performance Shares 
that have been earned on the basis of performance in relation to the 
established Performance Goals.  Payment Values of earned Performance 
Shares shall be distributed to the Participant or as soon as 
practicable after the expiration of the Performance Period and the 
Committee's determination.  The Committee shall determine whether 
Payment Values are to be distributed in the form of cash and/or shares 
of Common Stock.

Section 9.  Restricted Stock and Restricted Stock Units

     (a)  Subject to the provisions of the Plan, the Committee shall 
have sole and complete authority to determine the Employees to whom 
shares of Restricted Stock and Restricted Stock Units shall be 
granted, the number of shares of Restricted Stock and the number of 
Restricted Stock Units to be granted to each Participant, the duration 
of the Restricted Period during which and the conditions under which 
the Restricted Stock and Restricted Stock Units may be forfeited to 
the Company, and the other terms and conditions of such Awards.

     (b)  Shares of Restricted Stock and Restricted Stock Units may 
not be sold, assigned, transferred, pledged or otherwise encumbered, 
except as herein provided, during the Restricted Period.  At the 
expiration of the Restricted Period, the Company shall deliver such 
certificates to the Participant or the Participant's legal 
representative.  Payment for Restricted Stock Units shall be made to 
the Company in cash and/or shares of Common Stock, as determined at 
the sole discretion of the Committee.

Section 10.  Other Stock Based Awards

     (a)  In addition to granting Options, Rights, Performance Shares, 
Restricted Stock, Restricted Stock Units, the Committee shall have 
authority to grant Stock Unit Awards to Participants that can be in 
the form of Common Stock or units, the value of which is based, in 
whole or in part, on the value of Common Stock.  Subject to the 
provisions of the Plan, Stock Unit Awards shall be subject to such 
terms, restrictions, conditions, vesting requirements and payment 
rules as the Committee may determine in its sole and complete 
discretion at the time of grant.

     (b)  Any shares of Common Stock that are part of a Stock Unit 
Award may not be assigned, sold, transferred, pledged or otherwise 
encumbered prior to the date on which the shares are issued or, if 
later, the date provided by the Committee at the time of grant of the 
Stock Unit Award.

     Stock Unit Awards may provide for the payment of cash 
consideration by the person to whom such Award is granted or provide 
that the Award, and any Common Stock to be issued in connection 
therewith, if applicable, shall be delivered without the payment of 
cash consideration, provided that for any Common Stock to be purchased 
in connection with a Stock Unit Award the purchase price shall be at 
least 50 percent of the Fair Market Value of such Common Stock on the 
date such Award is granted.

     Stock Unit Awards may relate in whole or in part to certain 
performance criteria established by the Committee at the time of 
grant.  Stock Unit Awards may provide for deferred payment schedules 
and/or vesting over a specified period of employment.  In such 
circumstances as the Committee may deem advisable, the Committee may 
waive or otherwise remove, in whole or in part, any restriction or 
limitation to which a Stock Unit Award was made subject at the time of 
grant.

     (c)  In the sole and complete discretion of the Committee, an 
Award, whether made as a Stock Unit Award under this Section 10 or as 
an Award granted pursuant to Sections 6 through 9, may provide the 
Participant with dividends or dividend equivalents (payable on a 
current or deferred basis) and cash payments in lieu of or in addition 
to an Award.

Section 11.  Termination of Employment

     The following provisions define a Participant's status in the 
event of termination of employment:

     (a)  Options and Rights.  If a Participant shall cease to be 
employed by the Company or an Affiliate either directly or in a 
consulting role, any Option and any Right granted to him under the 
Plan shall terminate in accordance with the following rules:

          (1)  A Participant who terminates employment for any reason 
other than Approved Retirement, Disability or death shall lose the 
right to exercise any Options or Rights as of Termination of 
Employment.  Any Options transferred to a Family Member or family 
trust shall also be terminated as of the Participant's Termination of 
Employment for any reason other than Approved Retirement, Disability, 
or death.

          (2)  A Participant who terminates employment as a result of 
an Approved Retirement shall have a period of time specified in the 
individual agreements by which Options are granted to exercise such 
Options or Rights.

          (3)  A Participant who is Disabled shall have 12 months 
after Termination of Employment in which to exercise an Option or 
Right.

          (4)  Upon the death of a Participant during employment, the 
Participant's Designated Beneficiary shall have 12 months from the 
date of death to exercise the Participant's Option or Right.  Upon the 
death of a Participant after an Approved Retirement but within the 
period specified by the Committee to exercise Options or Rights after 
the Participant's Approved Retirement, the Participant's Designated 
Beneficiary shall have the period specified by the Committee to 
exercise the Option or Right.

          (5)  The foregoing notwithstanding, a Participant or the 
Participant's Designated Beneficiary shall not be permitted to 
exercise an Option or Right after the expiration date.

     (b)  Restricted Stock.  If a Participant terminates employment 
before the end of the Restricted Period for a reason other than death, 
Approved Retirement, Disability, or Change of Control, the Participant 
shall forfeit all shares of Restricted Stock as of Termination of 
Employment.  If a Participant terminates employment as a result of 
death, Approved Retirement, or Change of Control, the Committee, in 
its sole discretion, shall determine what portion, if any, of the 
Restricted Stock shall be freed from restrictions.

     (c)  Performance Shares and Other Awards.  If a Participant 
ceases to be an Employee before the end of any Performance Period as a 
result of death, Approved Retirement, or Disability, the Committee may 
authorize the payment to such Participant or his Designated 
Beneficiary of a pro rata portion of the amount that would have been 
paid to him had he continued as an Employee to the end of the 
Performance Period.  In the event a Participant terminates employment 
for any other reason, any amounts for outstanding Performance Periods 
shall be forfeited as of Termination of Employment.

Section 12.  General Provisions

     (a)  Withholding.  The Employer shall have the right to deduct 
from all amounts paid to a Participant in cash any taxes required by 
law to be withheld in respect of Awards under this Plan.  In the case 
of payments of Awards in the form of Common Stock, the Committee shall 
require the Participant to pay to the Employer the amount of any taxes 
required to be withheld with respect to such Common Stock, or, in lieu 
thereof, the Employer shall have the right to retain (or the 
Participant may be offered the opportunity to elect to tender) the 
number of shares of Common Stock whose Fair Market Value equals the 
amount required to be withheld.

     (b)  Awards.  Each Award shall be evidenced in writing delivered 
to the Participant and shall specify the terms and conditions and any 
rules applicable to such Award.

     (c)  Nontransferability.  Except as provided in Section 6(d), no 
Award shall be assignable or transferable, and no right or interest of 
any Participant shall be subject to any lien, obligation or liability 
of the Participant, except by will or the laws of descent and 
distribution.

     (d)   No Rights as Stockholder.  Subject to the provisions of the 
applicable Award, no Participant or Designated Beneficiary shall have 
any rights as a stockholder with respect to any shares of Common Stock 
to be distributed under the Plan until becoming the holder.  
Notwithstanding the foregoing, in connection with each grant of 
Restricted Stock hereunder, the applicable Award shall specify if and 
to what extent the Participant shall not be entitled to the rights of 
a stockholder in respect of such Restricted Stock.

     (e)  Construction of the Plan.  The validity, construction, 
interpretation, administration and effect of the Plan and of its rules 
and regulations, and rights relating to the Plan, shall be determined 
solely in accordance with the laws of Utah.

     (f)  Effective Date.  Subject to the approval of the stockholders 
of the Company, the Plan shall be effective on March 1, 1991.  No 
Options or Awards may be granted under the Plan, however, until the 
Plan is approved by the Company's shareholders or after May 20, 2001.  

     (g)  Amendment of Plan.  The Board of Directors may amend, 
suspend or terminate the Plan or any portion thereof at any time, 
provided that no amendment shall be made without stockholder approval 
if such approval is necessary to comply with any tax or regulatory 
requirement, including for these purposes any approval requirement 
that is a prerequisite for exemptive relief under Section 16(b) of the 
Securities Exchange Act of 1934.  

     (h)  Amendment of Award.  The Committee may amend, modify or 
terminate any outstanding Award with the Participant's consent at any 
time prior to payment or exercise in any manner not inconsistent with 
the terms of the Plan, including without limitation, to change the 
date or dates as of which an Option or Right becomes exercisable; a 
Performance Share is deemed earned; Restricted Stock becomes 
nonforfeitable; or to cancel and reissue an Award under such different 
terms and conditions as it determines appropriate.

Section 13.  Change of Control.

     In the event of a Change of Control of the Company, all Options, 
Restricted Stock, and other Awards granted under the Plan shall vest 
immediately. 

     A Change in Control of the Company shall be deemed to have 
occurred if (i) any "Acquiring Person" (as such term is defined in the 
Rights Agreement dated as of February 13, 1996, between the Company 
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 the 
Company representing 25 percent or more of the combined voting power 
of the Company; or (ii) the following individuals cease for any reason 
to constitute a majority of the number of directors then serving:  
individuals who, as of May 19, 1998, constitute the Company's Board of 
Directors 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 the Company) whose 
appointment or election by the Board or nomination for election by the 
Company's stockholders was approved or recommended by a vote of at 
least two-thirds of the directors then still in office who either were 
directors on May 19, 1998, or whose appointment, election or 
nomination for election was previously so approved or recommended; or 
(iii) the Company's stockholders approve a merger or consolidation of 
the Company or any direct or indirect subsidiary of the Company with 
any other corporation, other than a merger or consolidation that would 
result in the voting securities of the Company 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 the Company 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 the Company (or similar transaction) 
in which no person is or becomes the beneficial owner, directly or 
indirectly, of securities of the Company representing 25 percent or 
more of the combined voting power of the Company's then outstanding 
securities; or (iv) the Company'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 the Company of 
all or substantially all of the Company's assets, other than a sale or 
disposition by the Company 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 the Company in substantially the same proportions as 
their ownership of the Company 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.