Document:

<PAGE>

                                                                    EXHIBIT 10.2

                               SECOND AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT

         THIS SECOND AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (the
"Amendment") is made and entered into effective as of December 23, 2003, by and
among PETROQUEST ENERGY, L.L.C., a Louisiana limited liability company
("Borrower"); PETROQUEST ENERGY, INC., a Delaware corporation ("Guarantor");
BANK ONE, NA, a national banking association, (individually as a lender and as
agent, "Bank One").

                                R E C I T A L S:

         WHEREAS, Borrower, Guarantor, Bank One and Union Bank of California
entered into an Amended and Restated Credit Agreement dated May 14, 2003 (which
as the same may be amended from time to time is herein called the "Credit
Agreement"), pursuant to which Borrower amended and restated a previously
existing credit facility dated May 11, 2001; and

         WHEREAS, Union Bank of California has, by Assignment of even date
herewith, assigned and conveyed to Bank One all of its interest in the Credit
Agreement; and

         WHEREAS, Borrower, Guarantor and Bank One desire to amend the Credit
Agreement as herein set forth.

         NOW THEREFORE, in consideration of the premises herein contained and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:

         1.       Definitions. Except as otherwise provided below, unless the
context hereof indicates otherwise, all capitalized terms used herein shall have
the same meaning as such capitalized terms are defined in the Credit Agreement.

                  (a)      Definitions. Article I of the Credit Agreement is
         hereby amended by adding the following new defined terms and their
         definitions in proper alphabetical sequence as follows:

         "Acquisition Agreement" means that certain Purchase and Sale Agreement
         dated December 22, 2003, among Borrower, Guarantor, Carthage, and
         Addington, regarding the purchase by Borrower of Oil & Gas Properties
         in the Carthage Field located in Panola County, Texas."

         "Addington" means Addington Exploration, L.L.C., a Kentucky limited
         liability company"

         "Carthage" means Carthage, LLC, a Kentucky limited liability company"

                  (b)      Definitions. The following defined terms set forth in
         Article I of the Credit Agreement are hereby amended as follows:

<PAGE>

                           "Borrowing Base Reduction Amount" means (a) for each
                  month commencing March 1, 2004 until the next semi-annual
                  Borrowing Base redetermination pursuant to Section 2.2.2,
                  $1,000,000, and (b) for each month thereafter, such amount as
                  designated by 100% of the Lenders from time to time in
                  connection with each successive scheduled semi-annual
                  Borrowing Base redetermination pursuant to Section 2.2.2 or
                  successive unscheduled Borrowing Base redetermination pursuant
                  to Section 2.2.3.; provided however, if the Required Lenders
                  fail to timely designate a new Borrowing Base Reduction
                  Amount, then the Borrowing Base Reduction Amount most recently
                  in effect will continue in effect until the Required Lenders
                  designate a new Borrowing Base Reduction Amount."

                           "Unutilized Availability" means an amount equal to
                  the sum of (i) the Borrowing Base in effect from time to time;
                  and (ii) the amount available for borrowing by Borrower under
                  the Subordinated Credit Agreement, minus the Aggregate
                  Outstanding Debt."

         2.       Amendments to the Credit Agreement. The Credit Agreement is,
effective the date hereof, and subject to the satisfaction of the conditions
precedent set forth in Section 3 hereof, hereby amended as follows:

                  (a)      Section 2.2.1 Borrowing Base, of the Credit Agreement
is hereby amended by deleting the section in its entirety and substituting the
following:

                           "2.2.1 During the period from the date of this
         Agreement to the date as of which the Borrowing Base is first
         redetermined pursuant to Section 2.2.2, the Borrowing Base shall be
         $20,200,000.00."

                  (b)      A new Section 5.29 Acquisition Agreement is hereby
added to the Credit Agreement as follows:

                  "5.29    Acquisition Agreement. The transactions contemplated
         by the Acquisition Agreement have or will close as contemplated therein
         and neither Borrower, Guarantor, Carthage nor Addington has waived nor
         shall waive, or in any way amend, without the prior consent of the
         Agent, the terms of the Acquisition Agreement, including any condition
         to the obligations to close as so set forth therein. A true, correct
         and complete copy of the Acquisition Agreement (including all exhibits,
         schedules and amendments thereto) has been delivered to Agent and a
         true, correct and complete copy of each document and instrument
         delivered at closing of the Acquisition will be delivered to the Agent
         on the closing date thereof. Neither Carthage nor Addington is in
         default under the Acquisition Agreement or any document or instrument
         to be delivered in connection with the Acquisition Agreement executed
         in connection therewith. The representations and warranties made by
         Carthage and/ or Addington in the Acquisition Agreement and any other
         document or instrument will be true and correct (except for changes
         expressly provided for therein or herein) on and as of the closing date
         as though made on and as of such date."

                           Section 6.31.4 to the Credit Agreement is hereby
         deleted in its entirety.

<PAGE>

                  (d)      Section 6.32 to the Credit Agreement is hereby
         amended to read as follows:

                           "6.32.   Subordinated Indebtedness. The Borrower will
                  promptly provide the Agent with copies of all documentation,
                  notices and reports provided by or on behalf of the Borrower,
                  Guarantor or any Subsidiary to the Subordinated Lenders. On or
                  before the tenth (10th) day of each calendar month, the
                  Borrower shall deliver to the Agent a certificate, executed by
                  an Authorized Officer of the Borrower, setting forth the
                  outstanding balance of the Subordinated Indebtedness as of the
                  last day of the preceding month. The Borrower will not, and
                  will not permit the Guarantor or any Subsidiary to, make any
                  (i) payments on the principal amount of any Subordinated
                  Indebtedness; (ii) payments of interest on the Subordinated
                  Indebtedness after the occurrence of a Unmatured Default or a
                  Default; (iii) amendment or modification to the Subordinated
                  Credit Agreement or any other agreement evidencing or
                  governing any Subordinated Indebtedness without the prior
                  written consent of the Agent; or (iv) directly or indirectly
                  voluntarily prepay, defease or in substance defease, purchase,
                  redeem, retire or otherwise acquire, any portion of the
                  Subordinated Indebtedness without the prior written consent of
                  the Agent."

         3.       Conditions Precedent to Effectiveness of Amendment. This
Amendment shall become effective when, and only when, the Agent and Lenders
shall have received counterparts of this Amendment executed by Borrower and
Guarantor and Section 2 hereof shall become effective when, and only when, the
Agent and Lenders shall have additionally received all of the following
documents, each document (unless otherwise indicated) being dated the date of
receipt thereof by Lender (which date shall be the same for all such documents),
in form and substance satisfactory to the Lender:

                  (a)      Counterparts of this Amendment duly executed by
         Borrower, Guarantor and Lenders;

                  (b)      A copy of the resolutions approving this Amendment,
         and authorizing the transactions contemplated herein or therein duly
         adopted by the Managers of Borrower, accompanied by a certificate of
         the duly authorized Secretary of Borrower, that such copy is a true and
         correct copy of the resolutions duly adopted by the Managers of
         Borrower, and that such resolutions constitute all the resolutions
         adopted with respect to such transactions, and have not been amended,
         modified or revoked in any respect and are in full force and effect as
         of the date hereof;

                  (c)      A copy of the resolutions approving this Amendment,
         and authorizing the transactions contemplated herein or therein duly
         adopted by the Board of Directors of Guarantor, accompanied by a
         certificate of the duly authorized Secretary of Guarantor, that such
         copy is a true and correct copy of the resolutions duly adopted by the
         Board of Directors of Guarantor, and that such resolutions constitute
         all the resolutions adopted with respect to such transactions, and have
         not been amended, modified or revoked in any respect and are in full
         force and effect as of the date hereof;

<PAGE>

                  (d)      A certificate, executed by an Authorized Officer of
         Borrower and Guarantor, stating that attached thereto is a true,
         correct and complete copy of a fully executed counterpart of the
         Acquisition Agreement, all exhibits and schedules thereto and all other
         documents and instruments executed and delivered in connection
         therewith. Additionally, the Acquisition Agreement shall expressly
         permit the direct or indirect assignment (collateral or otherwise) to
         the Lenders of all of the rights, but none of the obligations of
         Borrower, as a purchaser, under the Acquisition Agreement;

                  (e)      Mortgages, executed by the Borrower, in a form
         satisfactory to the Agent, the Lenders and their counsel with respect
         to the Properties purchased by Borrower pursuant to the Acquisition
         Agreement and described therein, which are part of the Collateral, and
         such other agreements, documents and instruments as may be necessary
         and appropriate, in form and substance satisfactory to the Agent and
         the Lenders, executed and delivered by the Borrower, as mortgagor or
         assignor, in favor of the Agent, ratably for the benefit of the
         Lenders, in order to create and perfect the Lender Liens in and to all
         Collateral described therein;

                  (f)      There shall not have been, in the sole judgment of
         Lenders, any material adverse change in the financial condition,
         business or operations of Borrower or Guarantor;

                  (g)      Payment by Borrower of the fees and expenses of
         counsel to Lenders in connection with the preparation and negotiation
         of this Amendment and all documents and instruments contemplated
         hereby;

                  (h)      The legal opinion of counsel to Borrower and
         Guarantor, in form and substance satisfactory to the Agent and its
         counsel;

                  (i)      ISDA documents entered into between Borrower and any
         of the Lenders evidencing Rate Management Transactions with respect to
         the Oil and Gas Properties of the Borrower and Guarantor, with
         confirmations of the transactions thereunder providing satisfactory
         hedging of natural gas sales in amounts and at prices satisfactory to
         the Lenders from the date hereof through December, 2005;

                  (j)      The execution and delivery of such additional
         documents and instruments which the Agent and its counsel may deem
         necessary to effectuate this Amendment or any document executed and
         delivered to Lenders in connection herewith or therewith.

         4.       Representations and Warranties of Borrower. Borrower
represents and warrants as follows:

                  (a)      Borrower and Guarantor are each duly authorized and
         empowered to execute, deliver and perform this Amendment and all other
         instruments referred to or mentioned herein to which it is a party, and
         all action on its part requisite for the due execution, delivery and
         the performance of this Amendment has been duly and effectively taken.
         This Amendment, when executed and delivered, will constitute valid and
         binding obligations of Borrower and Guarantor, as the case may be,
         enforceable against such party in accordance

<PAGE>

         with its terms. This Amendment does not violate any provisions of the
         Articles of Organization or limited liability agreement of Borrower,
         the Certificate of Incorporation or By-Laws of Guarantor, or any
         contract, agreement, law or regulation to which either Borrower or
         Guarantor is subject, and does not require the consent or approval of
         any regulatory authority or governmental body of the United States or
         any state;

                  (b)      After giving affect to this Amendment, the
         representations and warranties contained in the Credit Agreement, as
         amended hereby, and any other Loan Documents executed in connection
         herewith or therewith are true, correct and complete on and as of the
         date hereof as though made on and as of the date hereof;

                  (c)      After giving affect to this Amendment, no event has
         occurred and is continuing which constitutes a Default or Unmatured
         Default; and

                  (d)      When duly executed and delivered, each of this
         Amendment and the Credit Agreement will be legal and binding
         obligations of Borrower, enforceable in accordance with their
         respective terms, except as limited by bankruptcy, insolvency or
         similar laws of general application relating to the enforcement of
         creditors' rights and by equitable principles of general application.

         5.       Reference to and Effect on the Loan Documents.

                  (a)      Upon the effectiveness of Section 2 hereof, on and
         after the date hereof, each reference in the Credit Agreement to "this
         Agreement", "hereunder", "hereof", "herein" or words of like import,
         and each reference in the Loan Documents shall mean and be a reference
         to the Credit Agreement as amended hereby.

                  (b)      Except as specifically amended above, the Credit
         Agreement and the Note(s), and all other instruments securing or
         guaranteeing Borrower's obligations to Lenders, including the
         Collateral Documents, as amended (collectively, the "Security
         Instruments") shall remain in full force and effect and are hereby
         ratified and confirmed. Without limiting the generality of the
         foregoing, the Security Instruments and all collateral described
         therein do and shall continue to secure the payment of all obligations
         of Borrower and Guarantor under the Credit Agreement and the Note(s),
         as amended hereby, and under the other Security Instruments.

                  (c)      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 Lender under any of the
         Security Instruments, nor constitute a waiver of any provision of any
         of the Security Instruments.

         6.       Waiver. As additional consideration for the execution,
delivery and performance of this Amendment by the parties hereto and to induce
Lenders to enter into this Amendment, Borrower and Guarantor each warrants and
represents to Lenders that no facts, events, statuses or conditions exist or
have existed which, either now or with the passage of time or giving of notice,
or both, constitute or will constitute a basis for any claim or cause of action
against Lenders or any defense to

<PAGE>

(i) the payment of any obligations and indebtedness under the Note(s) and/or the
Security Instruments, or (ii) the performance of any of its obligations with
respect to the Note(s) and/or the Security Instruments, and in the event any
such facts, events, statuses or conditions exist or have existed, Borrower
unconditionally and irrevocably waives any and all claims and causes of action
against Lenders and any defenses to its payment and performance obligations in
respect to the Note(s) and the Security Instruments.

         7.       Costs and Expenses. Borrower agrees to pay on demand all costs
and expenses of Lenders in connection with the preparation, reproduction,
execution and delivery of this Amendment and the other instruments and documents
to be delivered hereunder, including the reasonable fees and out-of-pocket
expenses of counsel for Lenders. In addition, Borrower shall pay any and all
fees payable or determined to be payable in connection with the execution and
delivery, filing or recording of this Amendment and the other instruments and
documents to be delivered hereunder, and agrees to save Lenders harmless from
and against any and all liabilities with respect to or resulting from any delay
in paying or omitting to pay such fees.

         8.       Execution in Counterparts. This Amendment may be executed in
any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed to be
an original and all of which taken together shall constitute but one and the
same instrument.

         9.       Governing Law. This Amendment shall be governed by and
construed in accordance with the laws of the State of Texas.

         10.      Final Agreement. THIS WRITTEN AMENDMENT REPRESENTS 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.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this instrument to
be duly executed in multiple counterparts, each of which is an original
instrument for all purposes, all as of the day and year first above written.

                                "BORROWER"

                                PETROQUEST ENERGY, L.L.C.

                                By: /s/ Michael O. Aldridge
                                    --------------------------------------------
                                    Michael O. Aldridge, Chief Financial Officer

                                "GUARANTOR"

                                PETROQUEST ENERGY, INC.

                                By: /s/ Michael O. Aldridge
                                    --------------------------------------------
                                    Michael O. Aldridge, Chief Financial Officer

<PAGE>

                                "LENDERS"

                                BANK ONE, NA,
                                As the Agent, a Lender and LC Issuer

                                By: /s/ Charles Kingswell-Smith
                                    --------------------------------------------
                                    Charles Kingswell-Smith
                                    Director<PAGE>
                                                               EXHIBIT 10(r)-(h)

                       EIGHTH AMENDMENT TO LOAN AGREEMENT

         THIS EIGHTH AMENDMENT TO LOAN AGREEMENT (this "Amendment"), dated as of
December 31, 2002, is between SOUTH HAMPTON REFINING CO., a Texas corporation
("Borrower"), and SOUTHWEST BANK OF TEXAS, N.A., a national banking association
("Lender").

                                    RECITALS:

         A. Borrower and Lender entered into that certain Loan Agreement dated
as of September 30, 1999, as amended by First Amendment to Loan Agreement dated
as of June 20, 2000, Second Amendment to Loan Agreement dated as of May 31,
2001, Third Amendment to Loan Agreement dated as of July 31, 2001, Fourth
Amendment to Loan Agreement dated as of October 31, 2001, Fifth Amendment to
Loan Agreement dated as of December 31, 2001, Sixth Amendment to Loan Agreement
dated as of April 30, 2002 and Seventh Amendment to Loan Agreement dated as of
August 31, 2002 (the "Agreement").

         B. Pursuant to the Agreement, Texas Oil & Chemical Co. II, Inc., a
Texas corporation ("Guarantor") executed that certain Guaranty Agreement dated
as of June 20, 2000 (the "Guaranty") pursuant to which Guarantor guaranteed to
Lender the payment and performance of the Obligations (as defined in the
Agreement).

         C. Borrower and Lender now desire to amend the Agreement as herein set
forth.

         NOW, THEREFORE, in consideration of the premises herein contained and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:

                                   ARTICLE I.

                                   Definitions

         Section 1.1. Definitions. Capitalized terms used in this Amendment, to
the extent not otherwise defined herein, shall have the meanings given to such
terms in the Agreement, as amended hereby.

<PAGE>
                                   ARTICLE II.

                                   Amendments

         Section 2.1. Amendment to Certain Definitions. The definition of the
term "Termination Date" contained in Section 1.1 of the Agreement is amended to
read in its entirety as follows:

                  "Termination Date" means 11:00 a.m., Houston, Texas time on
         February 28, 2003, or such earlier date on which the Commitment
         terminates as provided in this Agreement.

         Section 2.2. Amendment to Section 2.4. Clause (b) contained in Section
2.4 of the Agreement is amended to read in its entirety as follows:

         (b) (i) from December 31, 2002 through January 31, 2003, the sum of the
         Prime Rate in effect from day to day plus one-half of one percent
         (.50%), and (ii) from February 1, 2003 through the Termination Date,
         the sum of the Prime Rate in effect from day to day plus one percent
         (1.0%), and each change in the rate of interest charged on the Advances
         shall become effective, without notice to Borrower, on the effective
         date of each change in the Prime Rate or the Maximum Rate, as the case
         may be;

         Section 2.3. Amendment to Exhibits. Exhibit "A" (Note) to the Agreement
is amended to conform in its entirety to Annex "A" to this Amendment.

                                  ARTICLE III.

                              Conditions Precedent

         Section 3.1. Conditions. The effectiveness of this Amendment is subject
to the receipt by Lender of the following in form and substance satisfactory to
Lender:

                  (a) Certificate - Borrower. A certificate of the Secretary or
         another officer of Borrower acceptable to Lender certifying (i)
         resolutions of the board of directors of Borrower which authorize the
         execution, delivery and performance by Borrower of this Amendment and
         the other Loan Documents to which Borrower is or is to be a party and
         (ii) the names of the officers of Borrower authorized to sign this
         Amendment and each of the other Loan Documents to which Borrower is or
         is to be a party together with specimen signatures of such officers.

                                      -2-

<PAGE>

                  (b) Certificates of Existence and Good Standing - Borrower.
         Certificates of the appropriate governmental officials regarding the
         existence and good standing of Borrower in the state of Texas.

                  (c) Note. The Note executed by Borrower.

                  (d) Amendment Fee. An amendment fee in the amount of
         $2,500.00.

                  (e) Additional Information. Such additional documents,
         instruments and information as Lender may request.

         Section 3.2. Additional Conditions. The effectiveness of this Amendment
is also subject to the satisfaction of the additional conditions precedent that
(a) the representations and warranties contained herein and in all other Loan
Documents, as amended hereby, shall be true and correct as of the date hereof as
if made on the date hereof, (b) all proceedings, corporate or otherwise, taken
in connection with the transactions contemplated by this Amendment and all
documents, instruments and other legal matters incident thereto shall be
satisfactory to Lender, and (c) no Event of Default or Unmatured Event of
Default shall have occurred and be continuing.

                                   ARTICLE IV.

                 Ratifications, Representations, and Warranties

         Section 4.1. Ratifications. The terms and provisions set forth in this
Amendment shall modify and supersede all inconsistent terms and provisions set
forth in the Agreement and except as expressly modified and superseded by this
Amendment, the terms and provisions of the Agreement are ratified and confirmed
and shall continue in full force and effect. Borrower and Lender agree that the
Agreement as amended hereby shall continue to be the legal, valid and binding
obligation of such Persons enforceable against such Persons in accordance with
its terms.

         Section 4.2. Representations. Warranties and Agreements. Borrower
hereby represents and warrants to Lender that (a) the execution, delivery, and
performance of this Amendment and any and all other Loan Documents executed or
delivered in connection herewith have been authorized by all requisite action on
the part of Borrower and will not violate the articles of incorporation or
bylaws of Borrower, (b) the representations and warranties contained in the
Agreement as amended hereby, and all other Loan Documents are true and correct
on and as of the date hereof as though made on and as of the date hereof, (c) no
Event of Default or Unmatured Event of Default has occurred and is continuing,
(d) Borrower is in full compliance with all covenants and agreements contained
in the Agreement as amended hereby, (e) Borrower is indebted to Lender pursuant
to the terms of the Note, as

                                      -3-
<PAGE>

the same may have been renewed, modified, extended and rearranged, including,
without limitation, renewals, modifications and extensions made pursuant to this
Amendment, (f) the liens, security interests, encumbrances and assignments
created and evidenced by the Loan Documents are, respectively, valid and
subsisting liens, security interests, encumbrances and assignments and secure
the Note as the same may have been renewed, modified or rearranged, including,
without limitation, renewals, modifications and extensions made pursuant to this
Amendment, and (g) Borrower has no claims, credits, offsets, defenses or
counterclaims arising from the Loan Documents or Lender's performance under the
Loan Documents.

                                   ARTICLE V.

                                  Miscellaneous

         Section 5.1. Survival of Representations and Warranties. All
representations and warranties made in this Amendment or any other Loan
Documents including any Loan Document furnished in connection with this
Amendment shall fully survive the execution and delivery of this Amendment and
the other Loan Documents, and no investigation by Lender or any closing shall
affect the representations and warranties or the right of Lender to rely on
them.

         Section 5.2. Reference to Agreement. Each of the Loan Documents,
including the Agreement and any and all other agreements, documents, or
instruments now or hereafter executed and delivered pursuant to the terms hereof
or pursuant to the terms of the Agreement as amended hereby, are hereby amended
so that any reference in such Loan Documents to the Agreement shall mean a
reference to the Agreement, as amended hereby.

         Section 5.3. Expenses of Lender. As provided in the Agreement, Borrower
agrees to pay on demand all costs and expenses incurred by Lender in connection
with the preparation, negotiation and execution of this Amendment and the other
documents and instruments executed pursuant hereto and any and all amendments,
modifications and supplements thereto, including, without limitation, the costs
and fees of Lender's legal counsel, and all costs and expenses incurred by
Lender in connection with the enforcement or preservation of any rights under
the Agreement, as amended hereby, or any other Loan Document, including, without
limitation, the costs and fees of Lender's legal counsel.

         Section 5.4. Severability. Any provision of this Amendment held by a
court of competent jurisdiction to be invalid or unenforceable shall not impair
or invalidate the remainder of this Amendment and the effect thereof shall be
confined to the provision so held to be invalid or unenforceable.

                                      -4-
<PAGE>
         SECTION 5.5. APPLICABLE LAW. THIS Amendment AND ALL OTHER LOAN
DOCUMENTS EXECUTED PURSUANT HERETO SHALL BE DEEMED TO HAVE BEEN MADE AND TO BE
PERFORMABLE IN HOUSTON, HARRIS COUNTY, TEXAS AND SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS.

         Section 5.6. Successors and Assigns. This Amendment is binding upon and
shall inure to the benefit of Lender and Borrower and their respective
successors and assigns, except Borrower may not assign or transfer any of its
rights or obligations hereunder without the prior written consent of Lender.

         Section 5.7. Counterparts. This Amendment may be executed in one or
more counterparts, each of which when so executed shall be deemed to be an
original, but all of which when taken together shall constitute one and the same
instrument.

         Section 5.8. Effect of Waiver. No consent or waiver, express or
implied, by Lender to or for any breach of or deviation from any covenant,
condition or duty by Borrower shall be deemed a consent or waiver to or of any
other breach of the same or any other covenant condition or duty.

         Section 5.9. Headings. The headings, captions, and arrangements used
in this Amendment are for convenience only and shall not affect the
interpretation of this Amendment.

         SECTION 5.10. ENTIRE AGREEMENT. THIS AMENDMENT AND ALL OTHER
INSTRUMENTS, DOCUMENTS, AND AGREEMENTS EXECUTED AND DELIVERED IN CONNECTION WITH
THIS AMENDMENT EMBODY THE FINAL, ENTIRE AGREEMENT AMONG THE PARTIES HERETO WITH
RESPECT TO THE SUBJECT MATTER HEREOF AND THEREOF AND SUPERSEDE ANY AND ALL PRIOR
COMMITMENTS, AGREEMENTS, REPRESENTATIONS AND UNDERSTANDINGS, WHETHER WRITTEN OR
ORAL, RELATING TO THIS AMENDMENT AND THE OTHER INSTRUMENTS, DOCUMENTS AND
AGREEMENTS EXECUTED AND DELIVERED IN CONNECTION WITH THIS AMENDMENT, AND MAY NOT
BE CONTRADICTED OR VARIED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT
ORAL AGREEMENTS OR DISCUSSIONS OF THE PARTIES HERETO. THERE ARE NO ORAL
AGREEMENTS AMONG THE PARTIES HERETO.

                                      -5-

<PAGE>

Executed as of the date first written above.

                                        BORROWER:

                                        SOUTH HAMPTON REFINING CO.

                                        By: /s/ NICK CARTER
                                           ---------------------------
                                            Nick Carter
                                            President

                                        LENDER:

                                        SOUTHWEST BANK OF TEXAS, N.A.

                                        By: /s/ A. STEPHEN KENNEDY
                                           ---------------------------
                                            A. Stephen Kennedy
                                            Senior Vice President

         The undersigned Guarantor hereby consents and agrees to this Amendment
and agrees that the Guaranty Agreement executed by such person shall remain in
full force and effect and shall continue to be the legal, valid and binding
obligations of such Guarantor, enforceable against such Guarantor in accordance
with its terms and shall evidence such Guarantor's guaranty of the Note as
renewed and extended from time to time, including, without limitation, the
renewal and extension evidenced by the Note in substantially the form of Annex
"A" attached hereto.

                                             TEXAS OIL & CHEMICAL CO. II, INC.

                                             By: /s/ NICK CARTER
                                                ---------------------------
                                                 Nick Carter
                                                 President

                                       -6-
<PAGE>

                                 LIST OF ANNEXES

<Table>
<Caption>
Annex               Document
-----               --------
<S>                 <C>
  A                 Note
</Table>

                                      -7-
<PAGE>

                                    ANNEX "A"

                                      Note

<PAGE>
                                PROMISSORY NOTE

$3,250,000.00                      Houston, Texas            December 31, 2002

         FOR VALUE RECEIVED, the undersigned, SOUTH HAMPTON REFINING CO., a
Texas corporation ("Maker"), hereby promises to pay to the order of SOUTHWEST
BANK OF TEXAS, N.A., a national banking association ("Payee"), at its offices
at Five Post Oak Park, 4400 Post Oak Parkway, Houston, Harris County, Texas, or
such other address as may be designated by Payee, in lawful money of the United
States of America, the principal sum of THREE MILLION TWO HUNDRED FIFTY THOUSAND
AND NO/100 DOLLARS ($3,250,000.00), or so much thereof as may be advanced and
outstanding hereunder, together with interest on the outstanding principal
balance from day to day remaining, at a varying rate per annum which shall from
day to day be equal to the lesser of (a) the Maximum Rate (hereinafter defined)
or (b) (i) from December 31, 2002 through January 31, 2003, the sum of the Prime
Rate (hereinafter defined) of Payee in effect from day to day plus one-half of
one percent (.50%), and (ii) from February 1, 2003 through the Termination Date
(as defined in the Agreement) (hereinafter defined) of Payee in effect from day
to day plus one percent (1.0%), and each change in the rate of interest charged
hereunder shall become effective, without notice to Maker, on the effective date
of each change in the Prime Rate or the Maximum Rate, as the case may be;
provided, however, if at any time the rate of interest specified in clause (b)
preceding shall exceed the Maximum Rate, thereby causing the interest rate
hereon to be limited to the Maximum Rate, then any subsequent reduction in the
Prime Rate shall not reduce the rate of interest hereon below the Maximum Rate
until the total amount of interest accrued hereon equals the amount of interest
which would have accrued hereon if the rate specified in clause (b) preceding
had at all times been in effect.

         Principal of and interest on this Note shall be due and payable as
follows:

                  (a) Accrued and unpaid interest on this Note shall be payable
         monthly, on the first (1st) day of each month commencing on January 1,
         2003 and upon the maturity of this Note, however such maturity may be
         brought about; and

                  (b) All outstanding principal of this Note and all accrued
         interest thereon shall be due and payable on February 28, 2003.

         Principal of this Note shall be subject to mandatory prepayment at the
times described in the Agreement (hereinafter defined). If an Event of Default
(hereinafter defined) has occurred and is existing, the principal hereof and any
past due interest hereon shall bear interest at the Default Rate (hereinafter
defined).

         Interest on the indebtedness evidenced by this Note shall be computed
on the basis of a year of 360 days and the actual number of days elapsed
(including the first day but excluding

<PAGE>
the last day) unless such calculation would result in a usurious rate in which
case interest shall be calculated on the basis of a year of 365 or 366 days, as
the case may be.

         As used in this Note, the following terms shall have the respective
meanings indicated below:

                  "Agreement" means that certain Loan Agreement dated as of
         September 30, 1999 between Maker and Payee, as amended by First
         Amendment to Loan Agreement dated as of June 20, 2000, Second Amendment
         to Loan Agreement dated as of May 31, 2001, Third Amendment to Loan
         Agreement dated as of July 31, 2001, Fourth Amendment to Loan Agreement
         dated as of October 31, 2001, Fifth Amendment to Loan Agreement dated
         as of December 31, 2001, Sixth Amendment to Loan Agreement dated as of
         April 30, 2002, Seventh Amendment to Loan Agreement dated as of August
         31, 2002 and Eighth Amendment to Loan Agreement dated as of December
         31, 2002, as amended and as the same may be further amended or modified
         from time to time.

                  "Default Rate" means the lesser of (a) the sum of the Prime
         Rate plus five percent (5.0%), or (b) the Maximum Rate.

                  "Event of Default" shall have the meaning given to such term
         in the Agreement.

                  "Maximum Rate" means the maximum rate of nonusurious interest
         permitted from day to day by applicable law, including Chapter 303 of
         the Texas Finance Code (the "Code") (and as the same may be
         incorporated by reference in other Texas statutes). To the extent that
         Chapter 303 of the Code is relevant to any holder of this Note for the
         purposes of determining the Maximum Rate, each such holder elects to
         determine such applicable legal rate pursuant to the "weekly ceiling,"
         from time to time in effect, as referred to and defined in Chapter 303
         of the Code; subject, however, to the limitations on such applicable
         ceiling referred to and defined in the Code, and further subject to any
         right such holder may have subsequently, under applicable law, to
         change the method of determining the Maximum Rate.

                  "Prime Rate" shall mean that variable rate of interest per
         annum established by Payee from time to time as its prime rate which
         shall vary from time to time. Such rate is set by Payee as a general
         reference rate of interest, taking into account such factors as Payee
         may deem appropriate, it being understood that many of Payee's
         commercial or other loans are priced in relation to such rate, that it
         is not necessarily the lowest or best rate charged to any customer and
         that Payee may make various commercial or other loans at rates of
         interest having no relationship to such rate.

         This Note (a) is the Note provided for in the Agreement and (b) is
secured as provided in the Agreement. Maker may prepay the principal of this
Note upon the terms and conditions specified in the Agreement. Maker may borrow,
repay, and reborrow hereunder upon the terms and conditions specified in the
Agreement.

                                      -2-
<PAGE>
         Notwithstanding anything to the contrary contained herein, no
provisions of this Note shall require the payment or permit the collection of
interest in excess of the Maximum Rate. If any excess of interest in such
respect is herein provided for, or shall be adjudicated to be so provided, in
this Note or otherwise in connection with this loan transaction, the provisions
of this paragraph shall govern and prevail, and neither Maker nor the sureties,
guarantors, successors or assigns of Maker shall be obligated to pay the excess
amount of such interest, or any other excess sum paid for the use, forbearance
or detention of sums loaned pursuant hereto. If for any reason interest in
excess of the Maximum Rate shall be deemed charged, required or permitted by any
court of competent jurisdiction, any such excess shall be applied as a payment
and reduction of the principal of indebtedness evidenced by this Note; and, if
the principal amount hereof has been paid in full, any remaining excess shall
forthwith be paid to Maker. In determining whether or not the interest paid or
payable exceeds the Maximum Rate, Maker and Payee shall, to the extent permitted
by applicable law, (a) characterize any non-principal payment as an expense,
fee, or premium rather than as interest, (b) exclude voluntary prepayments and
the effects thereof, and (c) amortize, prorate, allocate, and spread in equal or
unequal parts the total amount of interest throughout the entire contemplated
term of the indebtedness evidenced by this Note so that the interest for the
entire term does not exceed the Maximum Rate.

         If default occurs in the payment of principal or interest under this
Note, or upon the occurrence of any other Event of Default, as such term is
defined in the Agreement, the holder hereof may, at its option, (a) declare the
entire unpaid principal of and accrued interest on this Note immediately due and
payable without notice, demand or presentment, all of which are hereby waived,
and upon such declaration, the same shall become and shall be immediately due
and payable, (b) foreclose or otherwise enforce all liens or security interests
securing payment hereof, or any part hereof, (c) offset against this Note any
sum or sums owed by the holder hereof to Maker and (d) take any and all other
actions available to Payee under this Note, the Agreement, the Loan Documents
(as such term is defined in the Agreement) at law, in equity or otherwise.
Failure of the holder hereof to exercise any of the foregoing options shall not
constitute a waiver of the right to exercise the same upon the occurrence of a
subsequent Event of Default.

         If the holder hereof expends any effort in any attempt to enforce
payment of all or any part or installment of any sum due the holder hereunder,
or if this Note is placed in the hands of an attorney for collection, or if it
is collected through any legal proceedings, Maker agrees to pay all costs,
expenses, and fees incurred by the holder, including all reasonable attorneys'
fees.

         THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF TEXAS AND THE APPLICABLE LAWS OF THE UNITED STATES OF
AMERICA. THIS NOTE IS PERFORMABLE IN HARRIS COUNTY, TEXAS.

         Maker and each surety, guarantor, endorser, and other party ever liable
for payment of any sums of money payable on this Note jointly and severally
waive notice, presentment,

                                      -3-

<PAGE>
demand for payment, protest, notice of protest and non-payment or dishonor,
notice of acceleration, notice of intent to accelerate, notice of intent to
demand, diligence in collecting, grace, and all other formalities of any kind,
and consent to all extensions without notice for any period or periods of time
and partial payments, before or after maturity, and any impairment of any
collateral securing this Note, all without prejudice to the holder. The holder
shall similarly have the right to deal in any way, at anytime, with one or more
of the foregoing parties without notice to any other party, and to grant any
such party any extensions of time for payment of any of said indebtedness, or to
release or substitute part or all of the collateral securing this Note, or to
grant any other indulgences or forbearances whatsoever, without notice to any
other party and without in any way affecting the personal liability of any party
hereunder.

         This Note is in renewal and extension of, but not in discharge or
novation of, that certain promissory note in the original principal amount of
$3,250,000.00, dated August 31, 2002, executed by Maker and payable to the order
of Payee, which was executed in renewal and extension of, but not in discharge
or novation of, that certain promissory note in the original principal amount of
$3,250,000.00, dated April 30, 2002, executed by Maker and payable to the order
of Payee, which was executed in renewal and extension of, but not in discharge
or novation of, that certain promissory note in the original principal amount of
$3,250,000.00, dated December 31, 2001, executed by Maker and payable to the
order of Payee, which was executed in renewal and extension of, but not in
discharge or novation of, that certain promissory note in the original principal
amount of $3,250,000.00, dated October 31, 2001, executed by Maker and payable
to the order of Payee, which was executed in renewal and extension of, but not
in discharge or novation of, that certain promissory note in the original
principal amount of $3,250,000.00, dated July 31, 2001, executed by Maker and
payable to the order of Payee, which was executed in renewal and extension of,
but not in discharge or novation of, that certain promissory note in the
original principal amount of $3,250,000.00, dated May 31, 2001, executed by
Maker and payable to the order of Payee, which was executed in renewal and
extension of, but not in discharge or novation of, that certain promissory note
in the original principal amount of $3,250,000.00, dated June 20, 2000, executed
by Maker and payable to the order of Payee, which was executed in renewal and
increase of, but not in discharge or novation of, that certain promissory note
in the original principal amount of $2,250,000.00, dated September 30, 1999,
executed by Maker and payable to the order of Payee.

                                        SOUTH HAMPTON REFINING CO.

                                        By: /s/ NICK CARTER
                                           ----------------------------
                                           Nick Carter
                                           President

                                       -4-

<PAGE>
                           SOUTH HAMPTON REFINING CO.

                              OFFICER'S CERTIFICATE

         I, the undersigned, hereby certify that I am the duly elected,
qualified, and acting Assistant Secretary of SOUTH HAMPTON REFINING CO., a Texas
corporation (the "Corporation"), and that I authorized to execute and deliver
this certificate, and I do hereby further certify as follows:

         1. Resolutions. The following resolutions have been duly adopted at a
meeting (duly convened where a quorum of directors was present) of, or by the
unanimous written consent of, the Board of Directors of the Corporation, and
such resolutions have not been amended or revoked, and are now in full force and
effect:

                  "WHEREAS, the Corporation and Southwest Bank of Texas, N.A.
         (the "Lender") have entered in that certain Loan Agreement dated
         September 30, 1999, as amended by First Amendment to Loan Agreement
         dated June 20, 2000, Second Amendment to Loan Agreement dated May
         31, 2001, Third Amendment to Loan Agreement dated July 31, 2001, Fourth
         Amendment to Loan Agreement dated October 31, 2001, Fifth Amendment to
         Loan Agreement dated December 31, 2001, Sixth Amendment to Loan
         Agreement dated April 30, 2002 and Seventh Amendment to Loan Agreement
         dated August 31, 2002 (collectively, the "Loan Agreement")."

                  "RESOLVED, that the renewal and extension of the revolving
         credit indebtedness of the Corporation to the Lender created pursuant
         to the Loan Agreement to be evidenced by a promissory note in the
         principal amount of $3,250,000.00 (the "Note") executed by the
         Corporation and payable to the order of the Lender, is hereby approved;
         and further

                  "RESOLVED, that the form and content of that certain Eighth
         Amendment to Loan Agreement (the "Amendment") to be entered into by the
         Corporation and the Lender in the form of drafts exhibited to each
         director, with such changes as are hereinafter authorized, are hereby
         approved; and further

                  "RESOLVED, that the form and content of the Note and all other
         documents to be executed in connection with the Amendment
         (collectively, the "Loan Documents"), as exhibited to each director and
         with such changes as are hereinafter authorized, are hereby approved;
         and further

                  "RESOLVED, that the President or any Vice President of the
         Corporation is hereby authorized, on behalf of the Corporation, to
         execute the Amendment and the Loan Documents and deliver the same to
         Lender in substantially the form approved by

<PAGE>
         these resolutions, with such amendments or changes thereto as the
         officer so acting may approve, such approval to be conclusively
         evidenced by such person's execution and delivery of the same; and
         further

                  "RESOLVED, that the President or any Vice President of the
         Corporation is hereby authorized, on behalf of the Corporation, to
         execute such other instruments and documents, and to take such other
         actions as the officer so acting deems necessary or desirable to
         effectuate the transactions contemplated by these resolutions; and
         further

                  "RESOLVED, that the Secretary or any Assistant Secretary of
         the Corporation is hereby authorized, on behalf of the Corporation, to
         certify and attest any documents which such person may deem necessary
         or appropriate to consummate the transactions contemplated by these
         resolutions; provided that such attestation shall not be required for
         the validity of any such documents; and further

                  "RESOLVED, that any and all actions taken by any of the
         officers or representatives of the Corporation, for and on behalf and
         in the name of the Corporation, with Lender prior to the adoption of
         these resolutions, including, without limitation, the negotiation of
         the Amendment and the Loan Documents, are hereby ratified, confirmed,
         are approved in all respects for all purposes; and further

                  "RESOLVED, that the powers and authorizations contained herein
         shall continue in full force and effect until written notice of
         revocation has been given to, and received by, the Lender."

         2. Incumbency. The following named persons are duly elected or
appointed, acting, and qualified officers of the Corporation holding at the date
hereof the offices set forth opposite their respective names, and the signatures
appearing opposite their respective names are their genuine signatures:

<Table>
<Caption>
   NAME                    TITLE                       SPECIMEN SIGNATURE
   ----                    -----                       ------------------
<S>                  <C>                               <C>
Nick Carter              President                     /s/ NICK CARTER
                                                       -----------------------

Connie Cook          Assistant Secretary               /s/ CONNIE COOK
                                                       -----------------------
</Table>

         3. Articles of Incorporation. The Articles of Incorporation of the
Corporation have not been amended (except as reflected in any attachments
hereto) or revoked since September 30, 1999, and remain in full force and effect
in the form delivered to the Lender.

         4. By-Laws. The By-Laws of the Corporation have not been amended
(except as reflected in any attachments hereto) or revoked since September 30,
1999, and remain in full force and effect in the form delivered to the Lender.

                                      -2-
<PAGE>

         IN WITNESS WHEREOF, I have duly executed this certificate as of January
30th, 2003.

                                                      /s/ CONNIE COOK
                                                      -----------------------
                                                      Assistant Secretary

         I, Nick Carter, President of the Corporation, do hereby certify that
Connie Cook is the duly elected and qualified Assistant Secretary of the
Corporation and the signature appearing opposite such person's name is such
person's genuine signature.

         DATED: As of January 30th, 2003.

                                    /s/ NICK CARTER
                                    -----------------------
                                    President

                                      -3-

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