Document:

[Execution]

**[NOTE: THE THIRD AMENDMENT (THE NEXT AMENDMENT) MUST INCORPORATE
CHANGES REQUESTED BY THE BANK OF TOKYO AND REQUIRE ALL LENDERS TO SIGN
THE NEXT AMENDMENT]**

              SECOND AMENDMENT TO US CREDIT AGREEMENT

     THIS SECOND AMENDMENT TO US CREDIT AGREEMENT (herein called the
"Amendment") made as of July 30, 1999, by and among Questar Market
Resources, Inc., a Utah corporation ("US Borrower"), Bank of America,
N.A., f/k/a NationsBank, N.A., individually and as administrative
agent for the Lenders, as defined below ("US Agent"), US Bank National
Association ("US Bank") and The Bank of Tokyo-Mitsubishi, Ltd, Houston
Agency ("Bank of Tokyo").

                       W I T N E S S E T H:

     WHEREAS, US Borrower, US Agent and the lenders as signatories
thereto (the "Original Lenders") entered into that certain US Credit
Agreement dated as of April 19, 1999, as amended by that certain First
Amendment to US Credit Agreement dated as of May 17, 1999 among the
same parties (the "Original Agreement"), for the purpose and
consideration therein expressed, whereby the Original Lenders became
obligated to make loans to US Borrower as therein provided; and

     WHEREAS, US Borrower and US Agent acting individually and on
behalf of each Original Lender pursuant to Section 1.1(f) of the
Original Agreement (which allows a pro rata increase in the Tranche A
Maximum Credit Amount, the Tranche B Maximum Credit Amount, the US
Maximum Credit Amount and the Canadian Maximum Credit Amount by an
aggregate amount of at least $10,000,000 or more, not to exceed
$50,000,000) desire to amend the definition of the US Maximum Credit
Amount, the Tranche A Maximum Credit Amount and the Tranche B Maximum
Credit Amount; and

     WHEREAS, the increases in the US Maximum Credit Amount, the
Tranche A Maximum Credit Amount and the Tranche B Maximum Credit
Amount will be commitments of US Bank and Bank of Tokyo, and the
obligations of the Original Lenders will not be increased by this
Amendment;

     NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements contained herein and in the Original
Agreement, in consideration of the loans which may hereafter be made
by Lenders to US Borrower, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto do hereby agree as follows:

                            ARTICLE I.

                    Definitions and References

     Section 1.1.  Terms Defined in the Original Agreement.  Unless
the context otherwise requires or unless otherwise expressly defined
herein, the terms defined in the Original Agreement shall have the
same meanings whenever used in this Amendment.

     Section 1.2.  Other Defined Terms.  Unless the context otherwise
requires, the following terms when used in this Amendment shall have
the meanings assigned to them in this Section 1.2
 .
          "Amendment" means this Second Amendment to US Credit
     Agreement.

          "Amendment Documents" means this Amendment, the US Bank
     Tranche A Note, the US Bank Tranche B Note, the Bank of Tokyo
     Tranche A Note and the Bank of Tokyo Tranche B Note.

          "Bank of Tokyo Tranche A Note" means the Tranche A Note of
     even date herewith in the stated principal amount of US
     $9,000,000 made payable to the order of Bank of Tokyo, attached
     hereto as Exhibit A-1.

          "Bank of Tokyo Tranche B Note" means the Tranche B Note of
     even date herewith in the stated principal amount of US
     $2,520,000 made payable to the order of Bank of Tokyo, attached
     hereto as Exhibit A-2.

          "Lenders" means the Original Lenders, US Bank and Bank of
          Tokyo.

          "US Bank Tranche A Note" means the Tranche A Note of even
     date herewith in the stated principal amount of US $15,000,000
     made payable to the order of US Bank, attached hereto as Exhibit
     A-3.

          "US Bank Tranche B Note" means the Tranche B Note of even
     date herewith in the stated principal amount of US $4,200,000
     made payable to the order of US Bank, attached hereto as Exhibit
     A-4, made payable to the order of US Bank.

          "US Credit Agreement" means the Original Agreement as
amended hereby.

                            ARTICLE II.

       Amendments to Original Agreement and Fee Arrangements

     Section 2.1.  Defined Terms.  The definitions of "US Maximum
Credit Amount", "Tranche A Maximum Credit Amount" and "Tranche B
Maximum Credit Amount" in Annex I of the Original Agreement are hereby
amended in their entirety to read as follows:

          "'Tranche A Maximum Credit Amount'" means the amount of US
     $177,000,000; provided that the Tranche A Maximum Credit Amount
     may be increased up to $180,000,000 pursuant to Section 1.1(f) of
     the US Agreement."

          "'Tranche B Maximum Credit Amount'" means the amount of US
     $49,560,000; provided that the Tranche B Maximum Credit Amount
     may be increased up to $50,000,000 pursuant to Section 1.1(f) of
     the US Agreement."

          "'US Maximum Credit Amount' means the amount of US
     $226,560,000; provided that the US Maximum Credit Amount may be
     increased up to US $230,000,000 pursuant to Section 1.1(f) of the
     US Agreement."

     Section 2.2.  Lenders Schedule.  Annex II to the Original
Agreement is hereby amended in its entirety to read as set forth in
Exhibit B attached hereto.

                           ARTICLE III.

                    Conditions of Effectiveness

     Section 3.1.  Effective Date.  This Amendment shall become
effective as of the date first above written when, and only when, (i)
US Agent shall have received, at US Agent's office, a counterpart of
this Amendment executed and delivered by US Borrower, US Bank and Bank
of Tokyo (ii) US Borrower shall have issued and delivered to US Agent,
for subsequent delivery to US Bank, a US Bank Tranche A Note and a US
Bank Tranche B Note with appropriate insertions payable to the order
of US Bank, duly executed on behalf of US Borrower, dated the date
hereof, (iii) US Borrower shall have issued and delivered to US Agent,
for subsequent delivery to Bank of Tokyo, a Bank of Tokyo Tranche A
Note and a Bank of Tokyo Tranche B Note with appropriate insertions
payable to the order of Bank of Tokyo, duly executed on behalf of US
Borrower, dated the date hereof, and (iv) US Agent shall have
additionally received from US Borrower, in connection with such US
Loan Documents, all other fees and reimbursements to be paid to US
Agent pursuant to any US Loan Documents, or otherwise due US Agent and
including fees and disbursements of US Agent's attorneys.

                            ARTICLE IV.

                  Representations and Warranties

     Section 4.1.  Representations and Warranties of Borrower.  In
order to induce US Agent and the undersigned Lenders to enter into
this Amendment, US Borrower represents and warrants to US Agent that:

          (a)  The representations and warranties contained in Article
     V of the Original Agreement are true and correct at and as of the
     time of the effectiveness hereof.

          (b)  US Borrower has duly taken all action necessary to
     authorize the execution and delivery by it of the Amendment
     Documents and to authorize the consummation of the transactions
     contemplated hereby and thereby and the performance of its
     obligations hereunder and thereunder.  US Borrower is duly
     authorized to borrow funds under the US Credit Agreement.

          (c)  The execution and delivery by the various Restricted
     Persons of the Amendment Documents to which each is a party, the
     performance by each of its obligations under such Amendment
     Documents and the consummation of the transactions contemplated
     by the various Amendment Documents do not and will not (a)
     conflict with any provision of (i) any Law, (ii) the
     organizational documents of any Restricted Person, or (iii) any
     agreement, judgment, license, order or permit applicable to or
     binding upon any Restricted Person, or (b) result in the
     acceleration of any Indebtedness owed by any Restricted Person,
     or (c) result in or require the creation of any Lien upon any
     assets or properties of any Restricted Person, except as
     expressly contemplated or permitted in the Loan Documents.
     Except as expressly contemplated in the Loan Documents no
     consent, approval, authorization or order of, and no notice to or
     filing with any Tribunal or third party is required in connection
     with the execution, delivery or performance by any Restricted
     Person of any Amendment Document or to consummate any
     transactions contemplated by the Amendment Documents.

          (d)  This Amendment is, and the other Amendment Documents
     when duly executed and delivered will be, a legal, valid and
     binding obligation of each Restricted Person which is a party
     hereto or thereto, enforceable in accordance with their terms,
     except as such enforcement may be limited by bankruptcy,
     insolvency or similar Laws of general application relating to the
     enforcement of creditors' rights and by equitable principles of
     general application relating to the enforcement of creditor's
     rights.

                            ARTICLE V.

                           Miscellaneous

     Section 5.1.  Ratification of Agreements.  The Original Agreement
as hereby amended is hereby ratified and confirmed in all respects.
The US Loan Documents, as they may be amended or affected by the
various Amendment Documents, are hereby ratified and confirmed in all
respects. Any reference to the US Credit Agreement in any Loan
Document shall be deemed to be a reference to the Original Agreement
as hereby amended.  Any reference to the Lenders or the Lender Parties
in any Loan Document shall be deemed to include US Bank and Bank of
Tokyo.  Any reference to the Tranche A Notes and the Tranche B Notes
in any other US Loan Document shall be deemed to include a reference
to the US Bank Tranche A Note, the US Bank Tranche B Note, the Bank of
Tokyo Tranche A Note and the Bank of Tokyo Tranche B Note issued and
delivered pursuant to this Amendment. The execution, delivery and
effectiveness of this Amendment and each of the US Bank Tranche A
Note, the US Bank Tranche B Note, the Bank of Tokyo Tranche A Note and
the Bank of Tokyo Tranche B Note shall not, except as expressly
provided herein or therein, operate as a waiver of any right, power or
remedy of Lenders under the US Credit Agreement, the US Notes, or any
other US Loan Document nor constitute a waiver of any provision of the
US Credit Agreement, the US Notes or any other US Loan Document.

     Section 5.2.  Survival of Agreements; Cumulative Nature.  All of
Restricted Persons' various representations, warranties, covenants and
agreements herein shall survive the execution and delivery of this
Amendment and the other Amendment Documents and the performance hereof
and thereof, including without limitation the making or granting of
the US Loans and the delivery of the US Bank Tranche A Note, the US
Bank Tranche B Note, the Bank of Tokyo Tranche A Note and the Bank of
Tokyo Tranche B Note, and shall further survive until all of the US
Obligations are paid in full to each Lender Party and all of Lender
Parties' obligations to US Borrower are terminated.  All statements
and agreements contained in any certificate or instrument delivered by
any Restricted Person hereunder or under the US Credit Agreement to
any Lender Party shall be deemed representations and warranties by US
Borrower or agreements and covenants of US Borrower under this
Amendment and under the US Credit Agreement.  The representations,
warranties, indemnities, and covenants made by Restricted Persons in
the US Loan Documents, and the rights, powers, and privileges granted
to Lender Parties in the US Loan Documents, are cumulative, and,
except for expressly specified waivers and consents, no Loan Document
shall be construed in the context of another to diminish, nullify, or
otherwise reduce the benefit to any Lender Party of any such
representation, warranty, indemnity, covenant, right, power or
privilege.  In particular and without limitation, no exception set out
in this Amendment or any other Amendment Document to any
representation, warranty, indemnity, or covenant herein or therein
contained shall apply to any similar representation, warranty,
indemnity, or covenant contained in any other Loan Document, and each
such similar representation, warranty, indemnity, or covenant shall be
subject only to those exceptions which are expressly made applicable
to it by the terms of the various US Loan Documents.

     Section 5.3.  Loan Documents.  This Amendment and each of the US
Bank Tranche A Note, the US Bank Tranche B Note, the Bank of Tokyo
Tranche A Note and the Bank of Tokyo Tranche B Note are each a US Loan
Document, and all provisions in the US Credit Agreement pertaining to
US Loan Documents apply hereto and thereto.

     Section 5.5.  Governing Law.  This Amendment shall be governed by
and construed in accordance the laws of the State of Utah and any
applicable laws of the United States of America in all respects,
including construction, validity and performance.  US Borrower hereby
irrevocably submits itself and each other Restricted Person to the
non-exclusive jurisdiction of the state and federal courts sitting in
the State of Utah and agrees and consents that service of process may
be made upon it or any Restricted Person in any legal proceeding
relating to the Amendment Documents or the Obligations by any means
allowed under Utah or federal law.

     Section 5.6.  Counterparts.  This Amendment may be separately
executed in any number of counterparts and by the different parties
hereto in separate counterparts, each of which when so executed shall
be deemed to constitute one and the same Amendment.  This Amendment
may be validly executed and delivered by facsimile or other electronic
transmission.

     THIS AMENDMENT AND THE OTHER US LOAN DOCUMENTS REPRESENT THE
FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY
EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF
THE PARTIES.  THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

  [The remainder of this page has been intentionally left blank.]

     IN WITNESS WHEREOF, this Amendment is executed as of the date
first above written.

                              QUESTAR MARKET RESOURCES, INC.
                              US Borrower

                              By:  /s/G. L. Nordloh
                                   G. L. Nordloh
                                   President and Chief Executive Officer

                                   Mailing Address:
                                   P.O. Box 45433
                                   Salt Lake City, Utah  84145
                                   Attention:  Martin H. Craven

                                   Street Address:
                                   180 East 100 South
                                   Salt Lake City, Utah  84111
                                   Telephone: (801) 324-5497
                                   Fax: (801) 324-5483

                              BANK OF AMERICA, N.A., f/k/a
                              NATIONSBANK, N.A.
                              Administrative Agent, US LC Issuer and Lender

                              By:  /s/David C. Rubenking
                                   David C. Rubenking
                                   Senior Vice President

                              US BANK NATIONAL ASSOCIATION
                              Lender

                              By:  /s/Mark E. Thompson
                                   Mark E. Thompson
                                   Vice President

                              THE BANK OF TOKYO-MITSUBISHI,
                                LTD.,HOUSTON AGENCY
                              Lender

                              By:
                                   Name:
                                   Title:

                                                      EXHIBIT A-1

                          PROMISSORY NOTE

US$9,000,000             [Tranche A Note]          July ___, 1999

     FOR VALUE RECEIVED, the undersigned, Questar Market Resources,
Inc., a Utah corporation (herein called "Borrower"), hereby promises
to pay to the order of The Bank of Tokyo-Mitsubishi, Ltd., Houston
Agency (herein called "Lender"), the principal sum of Nine Million and
no/100 Dollars (US$9,000,000), or, if greater or less, the aggregate
unpaid principal amount of the Tranche A Loans made under this Note by
Lender to Borrower pursuant to the terms of the Credit Agreement (as
hereinafter defined), together with interest on the unpaid principal
balance thereof as hereinafter set forth, both principal and interest
payable as herein provided in lawful money of the United States of
America at the offices of US Agent under the Credit Agreement, 901
Main Street, Dallas, Texas or at such other place within Dallas
County, Texas, as from time to time may be designated by the holder of
this Note.

     This Note (a) is issued and delivered under that certain US
Credit Agreement dated as of April 19, 1999, among Borrower, Bank of
America, N.A., f/k/a NationsBank, N.A., individually and as
administrative agent ("US Agent"), and the lenders (including Lender)
referred to therein, as amended by that certain First Amendment to US
Credit Agreement dated May 17, 1999 among Borrower, US Agent and the
lenders referred to therein, and as amended by that certain Second
Amendment to US Credit Agreement of even date herewith among Borrower,
US Agent and Lender (herein, as from time to time supplemented,
amended or restated, called the "Credit Agreement"), and is a "Tranche
A Note" as defined therein and (b) is subject to the terms and
provisions of the Credit Agreement, which contains provisions for
payments and prepayments hereunder and acceleration of the maturity
hereof upon the happening of certain stated events.  Payments on this
Note shall be made and applied as provided herein and in the Credit
Agreement.  Reference is hereby made to the Credit Agreement for a
description of certain rights, limitations of rights, obligations and
duties of the parties hereto and for the meanings assigned to terms
used and not defined herein.

     The principal amount of this Note, together with all interest
accrued hereon, shall be due and payable in full on the US Facility
Maturity Date.

     Tranche A Loans that are US Base Rate Loans (exclusive of any
past due principal or interest) from time to time outstanding shall
bear interest on each day outstanding at the US Base Rate in effect on
such day; provided that if an Event of Default has occurred and is
continuing, US Base Rate Loans shall bear interest on each day
outstanding at the applicable Default Rate in effect on such day.  On
each Interest Payment Date Borrower shall pay to the holder hereof all
unpaid interest which has accrued on the US Base Rate Loans to but not
including such Interest Payment Date.  Each Tranche A Loan that is a
US Dollar Eurodollar Loan (exclusive of any past due principal or
interest) shall bear interest on each day during the related Interest
Period at the related Adjusted US Dollar Eurodollar Rate in effect on
such day; provided that if an Event of Default has occurred and is
continuing, such US Dollar Eurodollar Loan shall bear interest on each
day outstanding at the applicable Default Rate in effect on such day.
On each Interest Payment Date relating to such US Dollar Eurodollar
Loan, Borrower shall pay to the holder hereof all unpaid interest
which has accrued on such US Dollar Eurodollar Loan to but not
including such Interest Payment Date.

     All past due principal of and past due interest on the Loans
shall bear interest on each day outstanding at the applicable Default
Rate in effect on such day, and such interest shall be due and payable
daily as it accrues.  Notwithstanding the foregoing provisions of this
paragraph: (a) this Note shall never bear interest in excess of the
Highest Lawful Rate, and (b) if at any time the rate at which interest
is payable on this Note is limited by the Highest Lawful Rate (by the
foregoing subsection (a) or by reference to the Highest Lawful Rate in
the definitions of US Base Rate, Adjusted US Dollar Eurodollar Rate,
and Default Rate), this Note shall bear interest at the Highest Lawful
Rate and shall continue to bear interest at the Highest Lawful Rate
until such time as the total amount of interest accrued hereon equals
(but does not exceed) the total amount of interest which would have
accrued hereon had there been no Highest Lawful Rate applicable
hereto.

     Notwithstanding the foregoing paragraph and all other provisions
of this Note, in no event shall the interest payable hereon, whether
before or after maturity, exceed the maximum amount of interest which,
under applicable Law, may be charged on this Note, and this Note is
expressly made subject to the provisions of the Credit Agreement which
more fully set out the limitations on how interest accrues hereon.
The term "applicable Law" as used in this Note shall mean the laws of
the State of Utah or the laws of the United States, whichever laws
allow the greater interest, as such laws now exist or may be changed
or amended or come into effect in the future.

     If this Note is placed in the hands of an attorney for collection
after default, or if all or any part of the indebtedness represented
hereby is proved, established or collected in any court or in any
bankruptcy, receivership, debtor relief, probate or other court
proceedings, Borrower and all endorsers, sureties and guarantors of
this Note jointly and severally agree to pay reasonable attorneys'
fees and collection costs to the holder hereof in addition to the
principal and interest payable hereunder.

     Borrower and all endorsers, sureties and guarantors of this Note
hereby severally waive demand, presentment, notice of demand and of
dishonor and nonpayment of this Note, protest, notice of protest,
notice of intention to accelerate the maturity of this Note,
declaration or notice of acceleration of the maturity of this Note,
diligence in collecting, the bringing of any suit against any party
and any notice of or defense on account of any extensions, renewals,
partial payments or changes in any manner of or in this Note or in any
of its terms, provisions and covenants, or any releases or
substitutions of any security, or any delay, indulgence or other act
of any trustee or any holder hereof, whether before or after maturity.

     This Note and the rights and duties of the parties hereto shall
be governed by the Laws of the State of Utah (without regard to
principles of conflicts of law), except to the extent the same are
governed by applicable federal Law.

                              QUESTAR MARKET RESOURCES, INC.

                              By:  /s/G. L. Nordloh
                                   G. L. Nordloh
                                   President and Chief Executive
                                   Officer

                                                      EXHIBIT A-2

                          PROMISSORY NOTE

US$2,520,000             [Tranche B Note]           July __, 1999

     FOR VALUE RECEIVED, the undersigned, Questar Market Resources,
Inc., a Utah corporation (herein called "Borrower"), hereby promises
to pay to the order of The Bank of Tokyo-Mitsubishi, Ltd., Houston
Agency (herein called "Lender"), the principal sum of Two Million Five
Hundred Twenty Thousand and no/100 Dollars (US$2,520,000), or, if
greater or less, the aggregate unpaid principal amount of the Tranche
B Loans made under this Note by Lender to Borrower pursuant to the
terms of the Credit Agreement (as hereinafter defined), together with
interest on the unpaid principal balance thereof as hereinafter set
forth, both principal and interest payable as herein provided in
lawful money of the United States of America at the offices of US
Agent under the Credit Agreement, 901 Main Street, Dallas, Texas or at
such other place within Dallas County, Texas, as from time to time may
be designated by the holder of this Note.

     This Note (a) is issued and delivered under that certain US
Credit Agreement dated as of April 19, 1999 among Borrower, Bank of
America, N.A., f/k/a NationsBank, N.A., individually and as
administrative agent ("US Agent"), and the lenders (including Lender)
referred to therein, as amended by that certain First Amendment to US
Credit Agreement dated May 17, 1999 among Borrower, US Agent and the
lenders referred to therein, and as amended by that certain Second
Amendment to US Credit Agreement of even date herewith among Borrower,
US Agent and Lender (herein, as from time to time supplemented,
amended or restated, called the "Credit Agreement"), and is a "Tranche
B Note" as defined therein and (b) is subject to the terms and
provisions of the Credit Agreement, which contains provisions for
payments and prepayments hereunder and acceleration of the maturity
hereof upon the happening of certain stated events.  Payments on this
Note shall be made and applied as provided herein and in the Credit
Agreement.  Reference is hereby made to the Credit Agreement for a
description of certain rights, limitations of rights, obligations and
duties of the parties hereto and for the meanings assigned to terms
used and not defined herein.

     The principal amount of this Note, together with all interest
accrued hereon, shall be due and payable in full on the Tranche B
Maturity Date.

     Tranche B Loans that are US Base Rate Loans (exclusive of any
past due principal or interest) from time to time outstanding shall
bear interest on each day outstanding at the US Base Rate in effect on
such day; provided that if an Event of Default has occurred and is
continuing, US Base Rate Loans shall bear interest on each day
outstanding at the applicable Default Rate in effect on such day.  On
each Interest Payment Date Borrower shall pay to the holder hereof all
unpaid interest which has accrued on the US Base Rate Loans to but not
including such Interest Payment Date.  Each Tranche B Loan that is a
US Dollar Eurodollar Loan (exclusive of any past due principal or
interest) shall bear interest on each day during the related Interest
Period at the related Adjusted US Dollar Eurodollar Rate in effect on
such day; provided that if an Event of Default has occurred and is
continuing, such US Dollar Eurodollar Loan shall bear interest on each
day outstanding at the applicable Default Rate in effect on such day.
On each Interest Payment Date relating to such US Dollar Eurodollar
Loan, Borrower shall pay to the holder hereof all unpaid interest
which has accrued on such US Dollar Eurodollar Loan to but not
including such Interest Payment Date.

     All past due principal of and past due interest on the Loans
shall bear interest on each day outstanding at the applicable Default
Rate in effect on such day, and such interest shall be due and payable
daily as it accrues.  Notwithstanding the foregoing provisions of this
paragraph: (a) this Note shall never bear interest in excess of the
Highest Lawful Rate, and (b) if at any time the rate at which interest
is payable on this Note is limited by the Highest Lawful Rate (by the
foregoing subsection (a) or by reference to the Highest Lawful Rate in
the definitions of US Base Rate, Adjusted US Dollar Eurodollar Rate,
and Default Rate), this Note shall bear interest at the Highest Lawful
Rate and shall continue to bear interest at the Highest Lawful Rate
until such time as the total amount of interest accrued hereon equals
(but does not exceed) the total amount of interest which would have
accrued hereon had there been no Highest Lawful Rate applicable
hereto.

     Notwithstanding the foregoing paragraph and all other provisions
of this Note, in no event shall the interest payable hereon, whether
before or after maturity, exceed the maximum amount of interest which,
under applicable Law, may be charged on this Note, and this Note is
expressly made subject to the provisions of the Credit Agreement which
more fully set out the limitations on how interest accrues hereon.
The term "applicable Law" as used in this Note shall mean the laws of
the State of Utah or the laws of the United States, whichever laws
allow the greater interest, as such laws now exist or may be changed
or amended or come into effect in the future.

     If this Note is placed in the hands of an attorney for collection
after default, or if all or any part of the indebtedness represented
hereby is proved, established or collected in any court or in any
bankruptcy, receivership, debtor relief, probate or other court
proceedings, Borrower and all endorsers, sureties and guarantors of
this Note jointly and severally agree to pay reasonable attorneys'
fees and collection costs to the holder hereof in addition to the
principal and interest payable hereunder.

     Borrower and all endorsers, sureties and guarantors of this Note
hereby severally waive demand, presentment, notice of demand and of
dishonor and nonpayment of this Note, protest, notice of protest,
notice of intention to accelerate the maturity of this Note,
declaration or notice of acceleration of the maturity of this Note,
diligence in collecting, the bringing of any suit against any party
and any notice of or defense on account of any extensions, renewals,
partial payments or changes in any manner of or in this Note or in any
of its terms, provisions and covenants, or any releases or
substitutions of any security, or any delay, indulgence or other act
of any trustee or any holder hereof, whether before or after maturity.

     This Note and the rights and duties of the parties hereto shall
be governed by the Laws of the State of Utah (without regard to
principles of conflicts of law), except to the extent the same are
governed by applicable federal Law.

                              QUESTAR MARKET RESOURCES, INC.

                              By:  /s/G. L. Nordloh
                                   G. L. Nordloh
                                   President and Chief Executive Officer

                                                      EXHIBIT A-3

                          PROMISSORY NOTE

US$15,000,000            [Tranche A Note]          July ___, 1999

     FOR VALUE RECEIVED, the undersigned, Questar Market Resources,
Inc., a Utah corporation (herein called "Borrower"), hereby promises
to pay to the order of US Bank National Association (herein called
"Lender"), the principal sum of Fifteen Million and no/100 Dollars
(US$15,000,000), or, if greater or less, the aggregate unpaid
principal amount of the Tranche A Loans made under this Note by Lender
to Borrower pursuant to the terms of the Credit Agreement (as
hereinafter defined), together with interest on the unpaid principal
balance thereof as hereinafter set forth, both principal and interest
payable as herein provided in lawful money of the United States of
America at the offices of US Agent under the Credit Agreement, 901
Main Street, Dallas, Texas or at such other place within Dallas
County, Texas, as from time to time may be designated by the holder of
this Note.

     This Note (a) is issued and delivered under that certain US
Credit Agreement dated as of April 19, 1999, among Borrower, Bank of
America, N.A., f/k/a NationsBank, N.A., individually and as
administrative agent ("US Agent"), and the lenders (including Lender)
referred to therein, as amended by that certain First Amendment to US
Credit Agreement dated May 17, 1999 among Borrower, US Agent and the
lenders referred to therein, and as amended by that certain Second
Amendment to US Credit Agreement of even date herewith among Borrower,
US Agent and Lender (herein, as from time to time supplemented,
amended or restated, called the "Credit Agreement"), and is a "Tranche
A Note" as defined therein and (b) is subject to the terms and
provisions of the Credit Agreement, which contains provisions for
payments and prepayments hereunder and acceleration of the maturity
hereof upon the happening of certain stated events.  Payments on this
Note shall be made and applied as provided herein and in the Credit
Agreement.  Reference is hereby made to the Credit Agreement for a
description of certain rights, limitations of rights, obligations and
duties of the parties hereto and for the meanings assigned to terms
used and not defined herein.

     The principal amount of this Note, together with all interest
accrued hereon, shall be due and payable in full on the US Facility
Maturity Date.

     Tranche A Loans that are US Base Rate Loans (exclusive of any
past due principal or interest) from time to time outstanding shall
bear interest on each day outstanding at the US Base Rate in effect on
such day; provided that if an Event of Default has occurred and is
continuing, US Base Rate Loans shall bear interest on each day
outstanding at the applicable Default Rate in effect on such day.  On
each Interest Payment Date Borrower shall pay to the holder hereof all
unpaid interest which has accrued on the US Base Rate Loans to but not
including such Interest Payment Date.  Each Tranche A Loan that is a
US Dollar Eurodollar Loan (exclusive of any past due principal or
interest) shall bear interest on each day during the related Interest
Period at the related Adjusted US Dollar Eurodollar Rate in effect on
such day; provided that if an Event of Default has occurred and is
continuing, such US Dollar Eurodollar Loan shall bear interest on each
day outstanding at the applicable Default Rate in effect on such day.
On each Interest Payment Date relating to such US Dollar Eurodollar
Loan, Borrower shall pay to the holder hereof all unpaid interest
which has accrued on such US Dollar Eurodollar Loan to but not
including such Interest Payment Date.

     All past due principal of and past due interest on the Loans
shall bear interest on each day outstanding at the applicable Default
Rate in effect on such day, and such interest shall be due and payable
daily as it accrues.  Notwithstanding the foregoing provisions of this
paragraph: (a) this Note shall never bear interest in excess of the
Highest Lawful Rate, and (b) if at any time the rate at which interest
is payable on this Note is limited by the Highest Lawful Rate (by the
foregoing subsection (a) or by reference to the Highest Lawful Rate in
the definitions of US Base Rate, Adjusted US Dollar Eurodollar Rate,
and Default Rate), this Note shall bear interest at the Highest Lawful
Rate and shall continue to bear interest at the Highest Lawful Rate
until such time as the total amount of interest accrued hereon equals
(but does not exceed) the total amount of interest which would have
accrued hereon had there been no Highest Lawful Rate applicable
hereto.

     Notwithstanding the foregoing paragraph and all other provisions
of this Note, in no event shall the interest payable hereon, whether
before or after maturity, exceed the maximum amount of interest which,
under applicable Law, may be charged on this Note, and this Note is
expressly made subject to the provisions of the Credit Agreement which
more fully set out the limitations on how interest accrues hereon.
The term "applicable Law" as used in this Note shall mean the laws of
the State of Utah or the laws of the United States, whichever laws
allow the greater interest, as such laws now exist or may be changed
or amended or come into effect in the future.

     If this Note is placed in the hands of an attorney for collection
after default, or if all or any part of the indebtedness represented
hereby is proved, established or collected in any court or in any
bankruptcy, receivership, debtor relief, probate or other court
proceedings, Borrower and all endorsers, sureties and guarantors of
this Note jointly and severally agree to pay reasonable attorneys'
fees and collection costs to the holder hereof in addition to the
principal and interest payable hereunder.

     Borrower and all endorsers, sureties and guarantors of this Note
hereby severally waive demand, presentment, notice of demand and of
dishonor and nonpayment of this Note, protest, notice of protest,
notice of intention to accelerate the maturity of this Note,
declaration or notice of acceleration of the maturity of this Note,
diligence in collecting, the bringing of any suit against any party
and any notice of or defense on account of any extensions, renewals,
partial payments or changes in any manner of or in this Note or in any
of its terms, provisions and covenants, or any releases or
substitutions of any security, or any delay, indulgence or other act
of any trustee or any holder hereof, whether before or after maturity.

     This Note and the rights and duties of the parties hereto shall
be governed by the Laws of the State of Utah (without regard to
principles of conflicts of law), except to the extent the same are
governed by applicable federal Law.

                              QUESTAR MARKET RESOURCES, INC.

                              By:  /s/G. L. Nordloh
                                   G. L. Nordloh
                                   President and Chief Executive Officer

                                                      EXHIBIT A-4

                          PROMISSORY NOTE

US$4,200,000             [Tranche B Note]           July __, 1999

     FOR VALUE RECEIVED, the undersigned, Questar Market Resources,
Inc., a Utah corporation (herein called "Borrower"), hereby promises
to pay to the order of US Bank National Association (herein called
"Lender"), the principal sum of Four Million Two Hundred Thousand and
no/100 Dollars (US$4,200,000), or, if greater or less, the aggregate
unpaid principal amount of the Tranche B Loans made under this Note by
Lender to Borrower pursuant to the terms of the Credit Agreement (as
hereinafter defined), together with interest on the unpaid principal
balance thereof as hereinafter set forth, both principal and interest
payable as herein provided in lawful money of the United States of
America at the offices of US Agent under the Credit Agreement, 901
Main Street, Dallas, Texas or at such other place within Dallas
County, Texas, as from time to time may be designated by the holder of
this Note.

     This Note (a) is issued and delivered under that certain US
Credit Agreement dated as of April 19, 1999 among Borrower, Bank of
America, N.A., f/k/a NationsBank, N.A., individually and as
administrative agent ("US Agent"), and the lenders (including Lender)
referred to therein, as amended by that certain First Amendment to US
Credit Agreement dated May 17, 1999 among Borrower, US Agent and the
lenders referred to therein, and as amended by that certain Second
Amendment to US Credit Agreement of even date herewith among Borrower,
US Agent and Lender (herein, as from time to time supplemented,
amended or restated, called the "Credit Agreement"), and is a "Tranche
B Note" as defined therein and (b) is subject to the terms and
provisions of the Credit Agreement, which contains provisions for
payments and prepayments hereunder and acceleration of the maturity
hereof upon the happening of certain stated events.  Payments on this
Note shall be made and applied as provided herein and in the Credit
Agreement.  Reference is hereby made to the Credit Agreement for a
description of certain rights, limitations of rights, obligations and
duties of the parties hereto and for the meanings assigned to terms
used and not defined herein.

     The principal amount of this Note, together with all interest
accrued hereon, shall be due and payable in full on the Tranche B
Maturity Date.

     Tranche B Loans that are US Base Rate Loans (exclusive of any
past due principal or interest) from time to time outstanding shall
bear interest on each day outstanding at the US Base Rate in effect on
such day; provided that if an Event of Default has occurred and is
continuing, US Base Rate Loans shall bear interest on each day
outstanding at the applicable Default Rate in effect on such day.  On
each Interest Payment Date Borrower shall pay to the holder hereof all
unpaid interest which has accrued on the US Base Rate Loans to but not
including such Interest Payment Date.  Each Tranche B Loan that is a
US Dollar Eurodollar Loan (exclusive of any past due principal or
interest) shall bear interest on each day during the related Interest
Period at the related Adjusted US Dollar Eurodollar Rate in effect on
such day; provided that if an Event of Default has occurred and is
continuing, such US Dollar Eurodollar Loan shall bear interest on each
day outstanding at the applicable Default Rate in effect on such day.
On each Interest Payment Date relating to such US Dollar Eurodollar
Loan, Borrower shall pay to the holder hereof all unpaid interest
which has accrued on such US Dollar Eurodollar Loan to but not
including such Interest Payment Date.

     All past due principal of and past due interest on the Loans
shall bear interest on each day outstanding at the applicable Default
Rate in effect on such day, and such interest shall be due and payable
daily as it accrues.  Notwithstanding the foregoing provisions of this
paragraph: (a) this Note shall never bear interest in excess of the
Highest Lawful Rate, and (b) if at any time the rate at which interest
is payable on this Note is limited by the Highest Lawful Rate (by the
foregoing subsection (a) or by reference to the Highest Lawful Rate in
the definitions of US Base Rate, Adjusted US Dollar Eurodollar Rate,
and Default Rate), this Note shall bear interest at the Highest Lawful
Rate and shall continue to bear interest at the Highest Lawful Rate
until such time as the total amount of interest accrued hereon equals
(but does not exceed) the total amount of interest which would have
accrued hereon had there been no Highest Lawful Rate applicable
hereto.

     Notwithstanding the foregoing paragraph and all other provisions
of this Note, in no event shall the interest payable hereon, whether
before or after maturity, exceed the maximum amount of interest which,
under applicable Law, may be charged on this Note, and this Note is
expressly made subject to the provisions of the Credit Agreement which
more fully set out the limitations on how interest accrues hereon.
The term "applicable Law" as used in this Note shall mean the laws of
the State of Utah or the laws of the United States, whichever laws
allow the greater interest, as such laws now exist or may be changed
or amended or come into effect in the future.

     If this Note is placed in the hands of an attorney for collection
after default, or if all or any part of the indebtedness represented
hereby is proved, established or collected in any court or in any
bankruptcy, receivership, debtor relief, probate or other court
proceedings, Borrower and all endorsers, sureties and guarantors of
this Note jointly and severally agree to pay reasonable attorneys'
fees and collection costs to the holder hereof in addition to the
principal and interest payable hereunder.

     Borrower and all endorsers, sureties and guarantors of this Note
hereby severally waive demand, presentment, notice of demand and of
dishonor and nonpayment of this Note, protest, notice of protest,
notice of intention to accelerate the maturity of this Note,
declaration or notice of acceleration of the maturity of this Note,
diligence in collecting, the bringing of any suit against any party
and any notice of or defense on account of any extensions, renewals,
partial payments or changes in any manner of or in this Note or in any
of its terms, provisions and covenants, or any releases or
substitutions of any security, or any delay, indulgence or other act
of any trustee or any holder hereof, whether before or after maturity.

     This Note and the rights and duties of the parties hereto shall
be governed by the Laws of the State of Utah (without regard to
principles of conflicts of law), except to the extent the same are
governed by applicable federal Law.

                              QUESTAR MARKET RESOURCES, INC.

                              By:  /s/G. L. Nordloh
                                   G. L. Nordloh
                                   President and Chief Executive Officer

                                                          EXHIBIT B

                         LENDER'S SCHEDULE[Execution]

              THIRD AMENDMENT TO US CREDIT AGREEMENT

     THIS THIRD AMENDMENT TO US CREDIT AGREEMENT (herein called the
"Amendment") made as of November 30, 1999, by and among Questar Market
Resources, Inc., a Utah corporation ("US Borrower"), Bank of America,
N.A., individually and as administrative agent for the Lenders as
defined below ("US Agent"), and the undersigned Lenders.

                       W I T N E S S E T H:

     WHEREAS, US Borrower, US Agent and the lenders as signatories
thereto (the "Lenders") entered into that certain US Credit Agreement
dated as of April 19, 1999, as amended by that certain First Amendment
to US Credit Agreement dated as of May 17, 1999, and as amended by
that certain Second Amendment to US Credit Agreement dated as of July
30, 1999 (the "Original Agreement"), for the purpose and consideration
therein expressed, whereby the Lenders became obligated to make loans
to US Borrower as therein provided; and

     WHEREAS, US Borrower, US Agent and the undersigned Lenders desire
to amend the Original Agreement for the purposes as provided herein;

     NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements contained herein and in the Original
Agreement, in consideration of the loans which may hereafter be made
by Lenders to US Borrower, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto do hereby agree as follows:

                            ARTICLE I.

                    Definitions and References

     Section 1.1.  Terms Defined in the Original Agreement.  Unless
the context otherwise requires or unless otherwise expressly defined
herein, the terms defined in the Original Agreement shall have the
same meanings whenever used in this Amendment.

     Section 1.2.  Other Defined Terms.  Unless the context otherwise
requires, the following terms when used in this Amendment shall have
the meanings assigned to them in this Section 1.2.

          "Amendment" means this Third Amendment to US Credit
     Agreement.

          "US Credit Agreement" means the Original Agreement as
amended hereby.

                            ARTICLE II.

                 Amendments to Original Agreement

     Section 2.1.  Hedging Contracts.  Section 7.10(i)(B) of the
Original Agreement is hereby amended in its entirety to read as
follows:

          "(B) such contracts do not require any Restricted Person to
     provide any Lien to secure US Borrower's obligations thereunder,
     other than Liens on cash or cash equivalents in an aggregate
     amount not more than US $30,000,000."

                           ARTICLE III.

                             Waiver

     Section 3.1.  Waiver.  US Borrower has informed US Agent that US
Borrower and Restricted Persons are in violation of the provisions of
Section 7.10(i) of the Original Agreement for the period covering
August 20, 1999 to and including the date hereof.   US Agent and the
undersigned Lenders hereby (a) waive any such violation of Section
7.10(i) and (b) waive any Default or Event of Default resulting from
such violation

                            ARTICLE IV.

                    Conditions of Effectiveness

     Section 4.1.  Effective Date.  This Amendment shall become
effective as of the date first above written when, and only when, (i)
US Agent shall have received, at US Agent's office, a counterpart of
this Amendment executed and delivered by US Borrower and Required
Lenders and (ii) US Agent shall have additionally received from US
Borrower, in connection with such US Loan Documents, all other fees
and reimbursements to be paid to US Agent pursuant to any US Loan
Documents, or otherwise due US Agent and including fees and
disbursements of US Agent's attorneys.

                            ARTICLE V.

                  Representations and Warranties

     Section 5.1.  Representations and Warranties of Borrower.  In
order to induce US Agent and Lenders to enter into this Amendment, US
Borrower represents and warrants to US Agent that:

          (a)  The representations and warranties contained in Article
     V of the Original Agreement are true and correct at and as of the
     time of the effectiveness hereof.

          (b)  US Borrower has duly taken all action necessary to
     authorize the execution and delivery by it of this Amendment and
     to authorize the consummation of the transactions contemplated
     hereby and the performance of its obligations hereunder.  US
     Borrower is duly authorized to borrow funds under the US Credit
     Agreement.

          (c)  The execution and delivery by US Borrower of this
     Amendment, the performance by US Borrower of its obligations
     hereunder and the consummation of the transactions contemplated
     herein do not and will not (a) conflict with any provision of (i)
     any Law, (ii) the organizational documents of US Borrower, or
     (iii) any agreement, judgment, license, order or permit
     applicable to or binding upon US Borrower, or (b) result in the
     acceleration of any Indebtedness owed by US Borrower, or (c)
     result in or require the creation of any Lien upon any assets or
     properties of US Borrower, except as expressly contemplated or
     permitted in the Loan Documents.  Except as expressly
     contemplated in the Loan Documents no consent, approval,
     authorization or order of, and no notice to or filing with any
     Tribunal or third party is required in connection with the
     execution, delivery or performance by US Borrower of this
     Amendment or to consummate any transactions contemplated herein.

          (d)  This Amendment is a legal, valid and binding obligation
     of US Borrower, enforceable in accordance with its terms, except
     as such enforcement may be limited by bankruptcy, insolvency or
     similar Laws of general application relating to the enforcement
     of creditors' rights and by equitable principles of general
     application relating to the enforcement of creditor's rights.

                            ARTICLE VI.

                           Miscellaneous

     Section 6.1.  Ratification of Agreements.  The Original Agreement
as hereby amended is hereby ratified and confirmed in all respects.
The US Loan Documents, as they may be amended or affected by this
Amendment, are hereby ratified and confirmed in all respects. Any
reference to the US Credit Agreement in any Loan Document shall be
deemed to be a reference to the Original Agreement as hereby amended.
The execution, delivery and effectiveness of this Amendment shall not,
except as expressly provided herein, operate as a waiver of any right,
power or remedy of Lenders under the US Credit Agreement, the US
Notes, or any other US Loan Document nor constitute a waiver of any
provision of the US Credit Agreement, the US Notes or any other US
Loan Document.

     Section 6.2.  Survival of Agreements; Cumulative Nature.  All of
US Borrower's various representations, warranties, covenants and
agreements herein shall survive the execution and delivery of this
Amendment and the performance hereof, including without limitation the
making or granting of the US Loans, and shall further survive until
all of the US Obligations are paid in full to each Lender Party and
all of Lender Parties' obligations to US Borrower are terminated.  All
statements and agreements contained in any certificate or instrument
delivered by any Restricted Person hereunder or under the US Credit
Agreement to any Lender Party shall be deemed representations and
warranties by US Borrower or agreements and covenants of US Borrower
under this Amendment and under the US Credit Agreement.  The
representations, warranties, indemnities, and covenants made by
Restricted Persons in the US Loan Documents, and the rights, powers,
and privileges granted to Lender Parties in the US Loan Documents, are
cumulative, and, except for expressly specified waivers and consents,
no Loan Document shall be construed in the context of another to
diminish, nullify, or otherwise reduce the benefit to any Lender Party
of any such representation, warranty, indemnity, covenant, right,
power or privilege.  In particular and without limitation, no
exception set out in this Amendment to any representation, warranty,
indemnity, or covenant herein contained shall apply to any similar
representation, warranty, indemnity, or covenant contained in any
other Loan Document, and each such similar representation, warranty,
indemnity, or covenant shall be subject only to those exceptions which
are expressly made applicable to it by the terms of the various US
Loan Documents.

     Section 6.3.  Loan Documents.  This Amendment is a US Loan
Document, and all provisions in the US Credit Agreement pertaining to
US Loan Documents apply hereto.

     Section 6.4.  Governing Law.  This Amendment shall be governed by
and construed in accordance the laws of the State of Utah and any
applicable laws of the United States of America in all respects,
including construction, validity and performance.  US Borrower hereby
irrevocably submits itself and each other Restricted Person to the
non-exclusive jurisdiction of the state and federal courts sitting in
the State of Utah and agrees and consents that service of process may
be made upon it or any Restricted Person in any legal proceeding
relating to the Amendment Documents or the Obligations by any means
allowed under Utah or federal law.

     Section 6.5.  Counterparts.  This Amendment may be separately
executed in any number of counterparts and by the different parties
hereto in separate counterparts, each of which when so executed shall
be deemed to constitute one and the same Amendment.  This Amendment
may be validly executed and delivered by facsimile or other electronic
transmission.

     THIS AMENDMENT AND THE OTHER US LOAN DOCUMENTS REPRESENT THE
FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY
EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF
THE PARTIES.  THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

  [The remainder of this page has been intentionally left blank.]

     IN WITNESS WHEREOF, this Amendment is executed as of the date
first above written.

                              QUESTAR MARKET RESOURCES, INC.
                              US Borrower

                              By:  /s/G. L. Nordloh
                                   G. L. Nordloh
                                   President and Chief Executive Officer

                                   Mailing Address:
                                   P.O. Box 45433
                                   Salt Lake City, Utah  84145
                                   Attention:  Martin H. Craven

                                   Street Address:
                                   180 East 100 South
                                   Salt Lake City, Utah  84111
                                   Telephone: (801) 324-5497
                                   Fax: (801) 324-5483

                              BANK OF AMERICA, N.A.,
                              Administrative Agent, US LC Issuer and
                              Lender

                              By:
                                   Name:
                                   Title:

                              TORONTO DOMINION (TEXAS), INC.
                              Lender

                              By:  /s/Jimmy Simien
                                   Jimmy Simien
                                   Vice President

                              BANK OF MONTREAL
                              Lender

                              By:  /s/James Whitmore
                                   James Whitmore
                                   Director

                                   BANK ONE, N.A., f/k/a THE FIRST
                                   NATIONAL BANK OF CHICAGO
                                   Lender

                                   By:
                                        Name:
                                        Title:

                                   FIRST SECURITY BANK, N.A.
                                   Lender

                                   By:
                                        Name:
                                        Title:

                                   MELLON BANK, N.A.
                                   Lender

                                   By:  /s/Roger E. Howard
                                        Roger E. Howard
                                        Vice President

                              US BANK NATIONAL ASSOCIATION
                              Lender

                              By:  /s/Mark E. Thompson
                                   Mark E. Thompson
                                   Vice President

                              THE BANK OF TOKYO-MITSUBISHI,
                               LTD.,HOUSTON AGENCY
                              Lender

                              By:
                                   Name:
                                   Title:

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