Document:

<PAGE>   1
                                                                    EXHIBIT 4.17

                 SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT

         THIS SECOND AMENDMENT TO LOAN AND SECURITY AGREEMENT (this "Amendment")
is made and entered into as of this 18th day of May, 2000, by and between THE
CIT GROUP/BUSINESS CREDIT, INC., a New York corporation (hereinafter "CITBC"),
in its individual capacity and as Agent for the Lenders hereinafter named
(hereinafter the "AGENT"), Foothill Capital Corporation, a California
corporation ("FCC"), GMAC Business Credit, LLC, a Michigan limited liability
company ("GMAC"), and any other party hereafter becoming a Lender pursuant to
Section 13, Paragraph 9 of the Agreement (as hereinafter defined), each
individually sometimes referred to as a "LENDER" and, collectively, the
"LENDERS"), and UTI Drilling, L.P., a Texas limited partnership ("UTI"), Norton
Drilling, L.P., a Delaware limited partnership, as successor in interest (by
conversion) to Norton Drilling Company, a Delaware corporation ("NDLP"),
Universal Well Services, Inc., a Delaware corporation ("UWSI"), UTI Management
Services, L.P., a Texas limited partnership ("UTIMS"), and Suits Drilling
Company, an Oklahoma corporation ("SDC"), (UTI, NDLP, UWSI, UTIMS and SDC,
together with any additional entities which may become a Company under the
Agreement from time to time, being referred to herein individually as a
"COMPANY" and, collectively, as the "COMPANIES").

                                    RECITALS

         A. WHEREAS, pursuant to the terms and subject to the conditions of that
certain Loan and Security Agreement dated as of November 22, 1999 between the
parties hereto (such Loan and Security Agreement, as the same is hereby amended
and may hereafter be amended from time to time, being hereinafter referred to as
the "Agreement"), the Companies were granted a $65,000,000 revolving line of
credit which included a letter of credit facility;

         B. WHEREAS, the indebtedness of the Companies to the Lenders is
currently evidenced by that certain Revolving Loan Promissory Note dated May 2,
2000 (the "Existing Revolving Note"), executed by the Companies and payable to
CITBC as Agent for the benefit of the Lenders;

         C. WHEREAS, payment of the Obligations of the Companies was supported
by the guaranties of UTI Energy Corp., a Delaware corporation (the "PARENT"),
UTICO, Inc., a Delaware corporation ("HOLDING"), UTICO Hard Rock Boring, Inc., a
Delaware corporation ("UHRB"), International Petroleum Services Company, a
Pennsylvania corporation ("IPSCO"), Norton Drilling Services, Inc., a Delaware
corporation ("NDS"), Norton Drilling Company Mexico, Inc., a Delaware
corporation ("NDM") and UTI Drilling Canada, Inc., a Delaware corporation ("UTI
CANADA") (Parent, Holding, UHRB, IPSCO, NDS, NDM and UTI Canada are referred to
herein, individually, as a "GUARANTOR" and, collectively, as the "GUARANTORS");

         D. WHEREAS, to secure, in part, the indebtedness under the Agreement
and the Existing Revolving Note (and all renewals, extensions, modifications
and/or rearrangements thereof and in connection therewith) and all other
indebtedness, liabilities and obligations of the Companies to the Agent for the
benefit of the Lenders, then existing or thereafter arising, (i) the Companies
have heretofore executed in favor of the Agent certain Loan Documents (as
defined in the Agreement), including, without limitation, the Guaranty, (as
defined in the Agreement), which Loan Documents shall continue as amended in
connection herewith in full force and effect upon the execution of this
Amendment, all of the Loan Documents to continue to secure the payment by the
Companies of the

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT- Page 1
<PAGE>   2

Obligations (as defined in the Agreement) all as more fully set forth therein
and herein;

         E. WHEREAS, the Companies have requested and, pursuant to the terms and
subject to the conditions hereof and in connection herewith, the Agent and the
Lenders have agreed to increase the amount of the Line of Credit (as defined in
the Agreement) to $75,000,000, and accept the Revolving Note (as herein defined)
in replacement and substitution (but not extinguishment) of the Existing
Revolving Note;

         F. WHEREAS, in furtherance of the foregoing and to evidence the
agreements of the parties hereto in relation thereto the parties hereto desire
to amend the Agreement as hereinafter provided;

         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 Companies, the Agent and the Lenders, intending to be
legally bound, agree as follows:

                                   AGREEMENT

                                    ARTICLE I
                                   DEFINITIONS

         1.01 Capitalized terms used in this Amendment are defined in the
Agreement, as amended hereby, unless otherwise stated.

                                   ARTICLE II
                             AMENDMENTS TO AGREEMENT

         Effective as of the respective date herein indicated, the Agreement is
hereby amended as follows:

         2.01 NEW DEFINITION OF "CANPARTNERS SUBORDINATION AGREEMENT". Effective
as of the date of execution of this Amendment, Section 1. Definitions of the
Agreement is amended by adding thereto the following new definition, to be
inserted in appropriate alphabetical order:

         "`CANPARTNERS SUBORDINATION AGREEMENT' shall mean that certain
         Subordination and Intercreditor Agreement dated as of November 22, 1999
         by and among Canpartners Investments IV, LLC, the Lenders, the Agent,
         UTI, NDLP, SDC, Parent, Holding, UWSI, UHRB, IPSCO, UTIMS, NDS and
         NDM."

         2.02 AMENDMENT AND RESTATEMENT OF DEFINITION OF "ACQUISITION FACILITY
COMMITMENT". Effective as of the date of execution of this Amendment, the
definition of "Acquisition Facility Commitment" set forth in Section 1.
Definitions of the Agreement is amended and restated to read in its entirety as
follows:

         "ACQUISITION FACILITY COMMITMENT shall mean, with respect to any
         Lender, a portion of the Revolving Loans which may be advanced as
         Acquisition Facility Loans, evidencing the amount of its commitment to
         make Acquisition Facility Loans (all such loans being Revolving Loans),
         as modified from time to time pursuant to the terms hereof, not to
         exceed $55,000,000 in the aggregate."

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT- Page 2
<PAGE>   3

         2.03 AMENDMENT AND RESTATEMENT OF DEFINITION OF "FIXED CHARGE COVERAGE
RATIO". Effective as of the date of execution of this Amendment, the definition
of "Fixed Charge Coverage Ratio" set forth in Section 1. Definitions of the
Agreement is amended and restated to read in its entirety as follows:

         "FIXED CHARGE COVERAGE RATIO shall mean, for the twelve month period
         ending on the date of the then most recent consolidated financial
         statements of the Parent and its Subsidiaries delivered (or required to
         be delivered) to the Agent pursuant to Section 7, Paragraph 8, the
         ratio determined by dividing (a) EBITDA for Parent on a consolidated
         basis plus the aggregate of all proceeds received from the issuance of
         Capital Stock by (b) the sum (for such period) of (i) all interest
         obligations due, but excluding any interest paid on or before September
         30, 2000 by Parent and any of its Subsidiaries in connection with the
         prepayment (whether in full or in part) of all principal and interest
         owing under the Subordinated Debt Loan Documents (as such term is
         defined in the Canpartners Subordination Agreement), (ii) the amount of
         principal scheduled or required to be repaid on the Indebtedness For
         Borrowed Money for Parent on a consolidated basis, but excluding (A)
         principal portions of Indebtedness For Borrowed Money of Parent on a
         consolidated basis that are repaid or discharged directly with Capital
         Stock (which Capital Stock is issued within twelve months prior to such
         repayment or discharge), (B) principal portions of Indebtedness For
         Borrowed Money and other Indebtedness of the Parent on a consolidated
         basis that are refinanced using securities that constitute Indebtedness
         For Borrowed Money (other than the Revolving Loans) or proceeds
         therefrom (which securities are issued within twelve months prior to
         such refinancing), (C) the repayment or prepayment of up to $3,500,000
         of principal amount of the promissory notes originally issued on July
         31, 1998, in the aggregate face amount of $7,790,000 to the former
         shareholders of SUITS Enterprises, Inc. in the event the Average
         Trading Value (as defined in such notes as in effect on the date
         hereof) exceeds $30.00 per share, (D) principal portions of the
         Obligations, and (E) any principal paid on or before September 30, 2000
         by the Parent or any of its Subsidiaries in connection with the
         prepayment (whether in full or in part) of principal and interest owing
         under the Subordinated Loan Documents (as such term is defined in the
         Canpartners Subordination Agreement), (iii) Capital Expenditures (other
         than for Permitted Acquisitions or replacements of assets subject to
         casualty occurrence with similar assets funded from insurance proceeds
         of such casualty occurrence or purchases of assets with proceeds from
         sales of assets permitted under this Agreement, (iv) all federal, state
         and local income tax expenses due and payable, and (v) all dividends of
         cash and property (other than dividends of Qualified Capital Stock)."

         2.04 AMENDMENT AND RESTATEMENT OF DEFINITION OF "LINE OF CREDIT".
Effective as of the date of execution of this Amendment, the definition of "Line
of Credit" set forth in Section 1. Definitions of the Agreement is amended and
restated to read in its entirety as follows:

         "LINE OF CREDIT shall mean the commitment of the Lenders in the
         aggregate amount of $75,000,000 to (a) make Revolving Loans pursuant to
         Sections 3 and 4 of this Agreement, and (b) assist the Companies in
         opening Letters of Credit pursuant to Section 5 of this

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT- Page 3
<PAGE>   4

         Agreement (up to the Letter of Credit Sub-Line)."

         2.05 AMENDMENT AND RESTATEMENT OF SUBPARAGRAPH (F) OF DEFINITION OF
"PERMITTED BUSINESS INVESTMENTS". Effective as of the date of execution of this
Amendment, subparagraph (f) of the definition "Permitted Business Investments"
set forth in Section 1. Definitions of the Agreement is amended and restated to
read in its entirety as follows:

         "(f) Advances, contributions and loans or other investments, by an
         Obligor, in or to, a Canadian Operating Company for the purpose of
         consummating Permitted Acquisitions and working capital and other
         general purposes; provided that (i) the amount of such advances,
         contributions and loans do not exceed in the aggregate 125% of the
         total purchase price of Permitted Acquisitions consummated by such
         Canadian Operating Company, (ii) no more than 35% of such advances,
         contributions and loans may be in the form of an advance, contribution
         or other investment that is not a loan, and (iii) all such loans are
         secured by a Canadian First Priority Lien."

         2.06 AMENDMENT AND RESTATEMENT OF SECTION 4, PARAGRAPH 1 OF THE
AGREEMENT. Effective as of the date of execution of this Amendment, Section 4,
Subparagraph 1(a)(i) of the Agreement is amended and restated to read in its
entirety as follows:

         "(a) (i) Following the making of such Revolving Loan and consummation
         of the Permitted Acquisition, there is at least $15 million of
         Availability (determined without regard to the Excluded L/Cs) and no
         more than an aggregate of $55 million of Revolving Loans outstanding,
         and (ii) until the Obligors have invested in the aggregate $25 million
         in cash (whether cash on hand or cash provided from Revolving loans to
         consummate Permitted Acquisitions pursuant to this Section 4) in
         Permitted Acquisitions that are Domestic Acquisitions, the aggregate
         amount of Revolving Loans outstanding for the purpose of consummating
         Canadian Acquisitions cannot exceed the sum of (A) $20 million plus (B)
         the amount of cash invested in Domestic Acquisitions (whether cash on
         hand or cash provided from Revolving Loans); or"

         2.07 AMENDMENT OF SECTION 8, PARAGRAPH 7 OF THE AGREEMENT. Effective as
of the date of execution of this Amendment, Section 4, Paragraph 7 of the
Agreement is amended as follows:

         (i) The present Paragraph 7 is renumbered as Subparagraph 7(a).

         (ii) A new Subparagraph 7(b) is hereby added to the Agreement to read
         in its entirety as follows:

                  "(b) Upon the execution of an amendment to this Agreement
                  increasing the Line of Credit to $75,000,000, the Companies
                  shall pay to the Agent for the pro rata benefit of the Lenders
                  an additional one time Loan Facility Fee in the amount of ONE
                  HUNDRED THOUSAND US DOLLARS ($100,000.00)."

         2.08 AMENDMENT AND RESTATEMENT OF SECTION 7, PARAGRAPH 10, SUBPARAGRAPH
J OF THE AGREEMENT. Effective as of the date of execution of this Amendment,
Section 7, Paragraph 10, Subparagraph J, Clause (z) of the Agreement is amended
and restated to read in its entirety as

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT- Page 4

<PAGE>   5
 follows:

                  "(z)     make any payment on the Subordinated Debt unless (A)
                           there has not occurred an Event of Default that is
                           continuing which has not been waived in writing by
                           the Agent and no Default or Event of Default would
                           occur and exist after giving effect thereto, (B) such
                           payment is permitted under the Subordination
                           Agreement, (C) after giving effect to such payment as
                           though it were a scheduled or required payment on the
                           Subordinated Debt (other than Subordinated Debt owing
                           to an Obligor) the Fixed Charge Coverage Ratio of the
                           Parent is not less than 1.0 to 1.0 for the twelve
                           month period ending on the date of the then most
                           recent consolidated financial statements of the
                           Parent and its Subsidiaries delivered (or required to
                           be delivered) to the Agent pursuant to Section 7,
                           Paragraph 8, preceding the date of such payment, and
                           (D) after giving effect to such payment, the amount
                           of the Availability would not be less than
                           $15,000,000 (in which case such payment shall not be
                           considered a Restricted Payment under this
                           Agreement); provided, however, if there has not
                           occurred an Event of Default that is continuing which
                           has not been waived in writing by the Agent, nothing
                           contained in paragraph (z) shall prohibit (i) the
                           making of any payment on the Subordinated Debt at any
                           time with Qualified Capital Stock or the proceeds
                           therefrom or if the payment would be permitted as a
                           Restricted Payment (after giving effect to such
                           payment) under this Agreement, or (ii) the prepayment
                           (whether in full or in part) of principal and
                           interest owing by the Parent or any Subsidiary
                           thereof owing under the Subordinated Debt Loan
                           Documents (as defined in the Canpartners
                           Subordination Agreement) as long as such prepayment
                           does not create an Event of Default and such
                           prepayment occurs on or before September 30, 2000."

         2.09 REVOLVING LOAN COMMITMENT. Effective as of the date of execution
of this Amendment, the Revolving Loan Commitment for each Lender will be the
amount set forth under each Lender's name of the signature page hereof.

         2.10 AMENDMENT AND RESTATEMENT OF EXHIBIT A TO THE AGREEMENT. Effective
as of the date of execution of this Amendment, Exhibit A to the Agreement is
amended and restated in its entirety as set forth on Exhibit A attached hereto.

                                   ARTICLE III
                              CONDITIONS PRECEDENT

         3.01 CONDITIONS TO EFFECTIVENESS. The effectiveness of this Amendment
is subject to the satisfaction of the following conditions precedent in a manner
satisfactory to CITBC, unless specifically waived in writing by CITBC:

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT- Page 5

<PAGE>   6
                  (a) CITBC shall have received each of the following, each in
form and substance satisfactory to CITBC, in its sole discretion, and, where
applicable, each duly executed by each party thereto, other than CITBC:

                           (i) This Amendment, duly executed by the Companies
         and the Consent, Ratification and Release is executed by the
         Guarantors;

                           (ii) A Revolving Loan Promissory Note in the stated
         principal amount of $75,000,000 in amendment, substitution and
         replacement of the Existing Revolving Note duly signed by the
         Companies; and

                           (iii) certified copies of the resolutions of the
         Board of Directors of each of the Companies and the Guarantors
         authorizing the execution, delivery and performance of the Revolving
         Loan Promissory Note, this Amendment and any and all other Loan
         Documents executed by any of the Companies or the Guarantors in
         connection therewith, along with a certificate of incumbency certified
         by the secretary of each of the Companies and the Guarantors with
         specimen signatures of the officers of the Companies and the Guarantors
         who are authorized to sign such documents, all in form and substance
         satisfactory to the Agent; and

                           (iv) All other documents CITBC may request with
         respect to any matter relevant to this Amendment or the transactions
         contemplated hereby.

                  (b) The representations and warranties contained herein and in
the Agreement and the other documents executed in connection with the Agreement
(herein referred to as "Loan Documents"), as each is amended hereby, shall be
true and correct as of the date hereof, as if made on the date hereof.

                  (c) No Default or Event of Default shall have occurred and be
continuing, unless such Default or Event of Default has been otherwise
specifically waived in writing by CITBC.

                  (d) All corporate proceedings taken in connection with the
transactions contemplated by this Amendment and all documents, instruments and
other legal matters incident thereto shall be satisfactory to CITBC.

                  (e) CITBC's receipt of the fee described in Section 2.07 of
this Amendment.

                                   ARTICLE IV
                  RATIFICATIONS, REPRESENTATIONS AND WARRANTIES

         4.01 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 the other Loan Documents, and, except as expressly
modified and superseded by this Amendment, the terms and provisions of the
Agreement and the other Loan Documents are ratified and confirmed and shall
continue in full force and effect. The Companies and CITBC agree that the
Agreement and the other Loan Documents, as amended hereby, shall continue to be
legal, valid, binding and enforceable in accordance with their respective terms.

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT- Page 6
<PAGE>   7

         4.02 REPRESENTATIONS AND WARRANTIES. The Companies hereby represent and
warrant to CITBC that (a) the execution, delivery and performance of this
Amendment and any and all other Loan Documents executed and/or delivered in
connection herewith have been authorized by all requisite corporate action on
the part of the Companies and will not violate the Articles (or Certificates) of
Incorporation or Bylaws of the Companies; (b) each of the Company's Board of
Directors has authorized the execution, delivery and performance of this
Amendment and any and all other Loan Documents executed and/or delivered in
connection herewith; (c) the representations and warranties contained in the
Agreement, as amended hereby, and any other Loan Document are true and correct
on and as of the date hereof and on and as of the date of execution hereof as
though made on and as of each such date; (d) no Default or Event of Default
under the Agreement, as amended hereby, has occurred and is continuing, unless
such Default or Event of Default has been specifically waived in writing by
CITBC; (e) the Companies are in full compliance with all covenants and
agreements contained in the Agreement and the other Loan Documents, as amended
hereby; and (f) the Companies have not amended their Articles (or Certificates)
of Incorporation or their Bylaws since the date of the Agreement, except as
otherwise disclosed to Agent.

                                    ARTICLE V
                            MISCELLANEOUS PROVISIONS

         5.01 SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All representations
and warranties made in the Agreement or any other Loan Document, including,
without limitation, any document furnished in connection with this Amendment,
shall survive the execution and delivery of this Amendment and the other Loan
Documents, and no investigation by CITBC or any closing shall affect the
representations and warranties or the right of CITBC to rely upon them.

         5.02 REFERENCE TO AGREEMENT. Each of the Agreement and the other Loan
Documents, and any and all other Loan Documents, 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 the Agreement and such other Loan Documents to the Agreement shall
mean a reference to the Agreement, as amended hereby.

         5.03 EXPENSES OF CITBC. As provided in the Agreement, the Companies
agree to pay on demand all reasonable costs and expenses incurred by CITBC in
connection with the preparation, negotiation, and execution of this Amendment
and the other Loan Documents executed pursuant hereto and any and all
amendments, modifications, and supplements thereto, including, without
limitation, the reasonable costs and fees of CITBC's legal counsel, and all
reasonable costs and expenses incurred by CITBC in connection with the
enforcement or preservation of any rights under the Agreement, as amended
hereby, or any other Loan Documents, including, without limitation, the
reasonable costs and fees of CITBC's legal counsel.

         5.04 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.

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT- Page 7
<PAGE>   8

         5.05 SUCCESSORS AND ASSIGNS. This Amendment is binding upon and shall
inure to the benefit of CITBC and the Companies and their respective successors
and assigns, except that the Companies may not assign or transfer any of their
rights or obligations hereunder without the prior written consent of CITBC.

         5.06 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.

         5.07 EFFECT OF WAIVER. No consent or waiver, express or implied, by
CITBC to or for any breach of or deviation from any covenant or condition by the
Companies shall be deemed a consent to or waiver of any other breach of the same
or any other covenant, condition or duty.

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

         5.09 APPLICABLE LAW. THIS AMENDMENT AND ALL OTHER LOAN DOCUMENTS
EXECUTED PURSUANT HERETO SHALL BE DEEMED TO HAVE BEEN MADE AND TO BE PERFORMABLE
IN AND SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK.

         5.10 FINAL AGREEMENT. THE AGREEMENT AND THE OTHER LOAN DOCUMENTS, EACH
AS AMENDED HEREBY, REPRESENT THE ENTIRE EXPRESSION OF THE PARTIES WITH RESPECT
TO THE SUBJECT MATTER HEREOF ON THE DATE THIS AMENDMENT IS EXECUTED. THE
AGREEMENT AND THE OTHER LOAN DOCUMENTS, AS AMENDED HEREBY, 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. NO
MODIFICATION, RESCISSION, WAIVER, RELEASE OR AMENDMENT OF ANY PROVISION OF THIS
AMENDMENT SHALL BE MADE, EXCEPT BY A WRITTEN AGREEMENT SIGNED BY COMPANIES AND
CITBC.

         5.11 RELEASE. THE COMPANIES HEREBY ACKNOWLEDGE THAT THEY HAVE NO
DEFENSE, COUNTERCLAIM, OFFSET, CROSS-COMPLAINT, CLAIM OR DEMAND OF ANY KIND OR
NATURE WHATSOEVER THAT CAN BE ASSERTED TO REDUCE OR ELIMINATE ALL OR ANY PART OF
ITS LIABILITY TO REPAY THE "OBLIGATIONS" OR TO SEEK AFFIRMATIVE RELIEF OR
DAMAGES OF ANY KIND OR NATURE FROM CITBC. THE COMPANIES HEREBY VOLUNTARILY AND
KNOWINGLY RELEASE AND FOREVER DISCHARGE CITBC, ITS PREDECESSORS, AGENTS,
EMPLOYEES, SUCCESSORS AND ASSIGNS, FROM ALL POSSIBLE CLAIMS, DEMANDS, ACTIONS,
CAUSES OF ACTION, DAMAGES, COSTS, EXPENSES, AND LIABILITIES WHATSOEVER, KNOWN OR
UNKNOWN, ANTICIPATED OR UNANTICIPATED, SUSPECTED OR UNSUSPECTED, FIXED,
CONTINGENT, OR CONDITIONAL, AT LAW OR IN EQUITY, ORIGINATING IN WHOLE OR IN PART
ON OR BEFORE THE DATE THIS AMENDMENT IS EXECUTED, WHICH THE COMPANIES MAY NOW OR
HEREAFTER HAVE AGAINST CITBC, ITS PREDECESSORS, AGENTS, EMPLOYEES, SUCCESSORS
AND ASSIGNS, IF ANY, AND IRRESPECTIVE OF WHETHER ANY SUCH CLAIMS ARISE OUT OF
CONTRACT, TORT,

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT- Page 8
<PAGE>   9

VIOLATION OF LAW OR REGULATIONS, OR OTHERWISE, AND ARISING FROM ANY "LOANS",
INCLUDING, WITHOUT LIMITATION, ANY CONTRACTING FOR, CHARGING, TAKING, RESERVING,
COLLECTING OR RECEIVING INTEREST IN EXCESS OF THE HIGHEST LAWFUL RATE
APPLICABLE, THE EXERCISE OF ANY RIGHTS AND REMEDIES UNDER THE AGREEMENT OR OTHER
LOAN DOCUMENTS, AND NEGOTIATION FOR AND EXECUTION OF THIS AMENDMENT.

              [The Remainder of this Page Intentionally Left Blank]

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT- Page 9
<PAGE>   10

         IN WITNESS WHEREOF, this Amendment has been executed and is effective
as of the date first above-written.

                                    COMPANIES:

                                    UTI DRILLING, L.P.
                                    UTI MANAGEMENT SERVICES, L.P.

                                    By: Utico Hard Rock  Boring,  Inc.,  the
                                    sole  general  partner of UTI Drilling, L.P.
                                    and UTI Management Services, L.P.

                                             By:
                                                --------------------------------
                                             Name:  John E. Vollmer, III
                                             Title: Vice President

                                    NORTON DRILLING, L.P.

                                    By:  Norton GP, L.L.C., its sole general
                                         partner
                                         By: Norton Drilling Services, Inc.,
                                         as Sole Member of Norton GP, L.L.C.

                                             By:
                                                -------------------------------
                                             Name:
                                                  -----------------------------
                                             Title:
                                                   ----------------------------

                                    UNIVERSAL WELL SERVICES, INC.
                                    SUITS DRILLING COMPANY

                                              By:
                                                 ------------------------------
                                              Name:  John E. Vollmer, III
                                              Title: Vice President of each of
                                              the foregoing Companies

                                    LENDERS:

                                    THE CIT GROUP/BUSINESS CREDIT,INC.
                                    as Agent and Lender

                                    By:
                                       ----------------------------------------
                                    Name:
                                         --------------------------------------
                                    Title:
                                          -------------------------------------

                                    Revolving Loan Commitment:  $28,846,155.00

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   11

                                    GMAC BUSINESS CREDIT, LLC
                                    as Syndication Agent and Lender

                                    By:
                                       ----------------------------------------
                                    Name:
                                         --------------------------------------
                                    Title:
                                          -------------------------------------

                                    Revolving Loan Commitment:  $23,076,922.50

                                    FOOTHILL CAPITAL CORPORATION
                                    as Documentation Agent and Lender

                                    By:
                                       ----------------------------------------
                                    Name:
                                         --------------------------------------
                                    Title:
                                          -------------------------------------

                                    Revolving Loan Commitment:  $23,076,922.50

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   12

                        CONSENT, RATIFICATION AND RELEASE

         The undersigned each hereby consents to the terms of the within and
foregoing Amendment, confirms and ratifies the terms of that certain Guaranty
Agreement dated November 22, 1999 executed (or assumed) by the undersigned for
the benefit of Agent and the other Lenders (the "Guaranty Agreement"), and
acknowledges that the Guaranty Agreement is in full force and effect and
ratifies the same, that the undersigned each has no defense, counterclaim,
set-off or any other claim to diminish the undersigned's liability under such
document, that the undersigned's consent is not required to the effectiveness of
the within and foregoing Amendment, and that no consent by the undersigned is
required for the effectiveness of any future amendment, modification,
forbearance or other action with respect to the Obligations, the Collateral, or
any of the other Loan Agreements. THE UNDERSIGNED EACH HEREBY VOLUNTARILY AND
KNOWINGLY RELEASES AND FOREVER DISCHARGES LENDER, ITS PREDECESSORS, AGENTS,
EMPLOYEES, SUCCESSORS AND ASSIGNS, FROM ALL POSSIBLE CLAIMS, DEMANDS, ACTIONS,
CAUSES OF ACTION, DAMAGES, COSTS, EXPENSES, AND LIABILITIES WHATSOEVER, KNOWN OR
UNKNOWN, ANTICIPATED OR UNANTICIPATED, SUSPECTED OR UNSUSPECTED, FIXED,
CONTINGENT, OR CONDITIONAL, AT LAW OR IN EQUITY, ORIGINATING IN WHOLE OR IN PART
ON OR BEFORE THE DATE THIS AMENDMENT IS EXECUTED, WHICH THE UNDERSIGNED MAY NOW
OR HEREAFTER HAVE AGAINST LENDER, ITS PREDECESSORS, AGENTS, EMPLOYEES,
SUCCESSORS AND ASSIGNS, IF ANY, AND IRRESPECTIVE OF WHETHER ANY SUCH CLAIMS
ARISE OUT OF CONTRACT, TORT, VIOLATION OF LAW OR REGULATIONS, OR OTHERWISE, AND
ARISING FROM ANY "LOANS", INCLUDING, WITHOUT LIMITATION, ANY CONTRACTING FOR,
CHARGING, TAKING, RESERVING, COLLECTING OR RECEIVING INTEREST IN EXCESS OF THE
HIGHEST LAWFUL RATE APPLICABLE, THE EXERCISE OF ANY RIGHTS AND REMEDIES UNDER
THE LOAN AGREEMENT OR OTHER AGREEMENTS, AND NEGOTIATION FOR AND EXECUTION OF
THIS AMENDMENT.

GUARANTORS:                                  UTICO, INC.

UTI DRILLING CANADA, INC.
UTICO HARD ROCK BORING, INC.                 By:
NORTON DRILLING COMPANY                         -------------------------
                                            Kenneth J. Kubacki
     MEXICO, INC.                            Vice President and Treasurer
INTERNATIONAL PETROLEUM
    SERVICES COMPANY
                                             UTI ENERGY CORP.

By:
   -----------------------------------       By:
John E. Vollmer III, Vice President             -------------------------
signing as such on behalf of each of the     John E. Vollmer III
foregoing Obligors                           Senior Vice President

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   13

                                    EXHIBIT A
                         REVOLVING LOAN PROMISSORY NOTE

                                  May 18, 2000

$75,000,000

FOR VALUE RECEIVED, the undersigned Companies (each a "COMPANY" and,
collectively, the "COMPANIES"), promise, jointly and severally, to pay to the
order of THE CIT GROUP/BUSINESS CREDIT, INC. (herein "CITBC"), as Agent for the
Lenders under a certain Loan and Security Agreement dated November 22, 1999
between CITBC as Agent and Lender, other Lenders parties thereto and each
Company, as amended from time to time (herein the "AGREEMENT") at its office
located at 1211 Avenue of the Americas, New York, New York 10036, or such other
address as may be designated by the Agent, in lawful money of the United States
of America and in immediately available funds, the principal amount of Seventy
Five Million and No/100 Dollars ($75,000,000), or such other principal amount
advanced pursuant to Section 3, Paragraph 1 or Section 4 of the Agreement. The
balance of such Revolving Loan will fluctuate as a result of the daily
application of the proceeds of collections of the Accounts and the making of
additional Revolving Loans as described in said Section 3 or Section 4 of the
Agreement. The Revolving Loans may be borrowed, repaid and reborrowed by any
Company, subject to the terms of the Agreement. A final payment in an amount
equal to the outstanding aggregate balance of principal and interest remaining
unpaid, if any, under this Revolving Loan Promissory Notes as shown on the books
and records of the Agent shall be due and payable upon any termination of the
Agreement.

All capitalized terms used herein shall have the meaning provided therefor in
this Agreement, unless otherwise defined herein.

The Companies further promise, jointly and severally, to pay interest at such
office, in like money, on the unpaid principal amount owing hereunder from time
to time from the date hereof on the dates and at the rates specified in Section
8, Paragraph 1 of the Agreement.

If any payment on this Revolving Loan Promissory Note becomes due and payable on
a day other than a Business Day, the maturity thereof shall be extended to the
next succeeding Business Day, and with respect to payments of principal,
interest thereon shall be payable at the then applicable rate during such
extension.

This Revolving Loan Promissory Note is a Revolving Loan Promissory Note referred
to in the Agreement, and is subject to, and entitled to, all provisions and
benefits thereof and is subject to optional and mandatory prepayment, in whole
or in part, as provided therein.

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   14

The date and amount of the advance(s) made hereunder may be recorded on the
schedule which is attached hereto and hereby made part of this Note or the
separate ledgers maintained by the Agent, provided that any failure to record
any such information on such schedule shall not in any manner affect the
obligation of any Company to make payments of principal and interest in
accordance with the terms of this Revolving Loan Promissory Note. The aggregate
unpaid principal amount of all advances made pursuant hereto may be set forth in
the balance column on said schedule or such ledgers maintained by the Agent. All
such advances, whether or not so recorded, shall be due as part of this
Revolving Loan Promissory Note.

Each Company confirms that any amount received by or paid to the Agent in
connection with this Agreement and/or any balances standing to its credit on any
of its accounts on the Agent's books under this Agreement may in accordance with
the terms of this Agreement be applied in reduction of this Revolving Loan
Promissory Note, but no balance or amounts shall be deemed to effect payment in
whole or in part of this Revolving Loan Promissory Note unless the Agent shall
have actually charged such account or accounts for the purposes of such
reduction or payment of this Revolving Loan Promissory Note.

Upon the occurrence and during the continuance of any one or more of the Events
of Default specified in the Agreement or upon termination of this Agreement, all
amounts then remaining unpaid on this Revolving Loan Promissory Note may become,
or be declared to be, immediately due and payable as provided in the Agreement.

Each Company and the Guarantors, sureties and endorses jointly and severally
waive grace, demand, presentment for payment, notice of dishonor or default,
notice of intent to accelerate, notice of acceleration, protest and diligence in
collecting this Revolving Loan Promissory Note.

This Revolving Loan Promissory Note shall be governed by, and construed in
accordance with, the laws of the State of New York and the applicable federal
laws of the United States.

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   15
This Revolving Loan Promissory Note is given in amendment, replacement and
substitution, but not extinguishment, of all amounts unpaid under that certain
Revolving Loan Promissory Note dated May 2, 2000 payable by the Companies to the
order of CTIBC as Agent for the Lenders in the stated principal amount of
$65,000,000.00.

                               COMPANIES:

                               UTI DRILLING, L.P.

                               By:    UTICO HARD ROCK BORING, INC.,
                                      as sole General Partner

                                      By:
                                         -----------------------------------
                                         John E. Vollmer III, Vice President

                               SUITS DRILLING COMPANY

                               By:
                                  ------------------------------------------
                                   John E. Vollmer III, Vice President

                               UNIVERSAL WELL SERVICES, INC.

                               By:
                                  ------------------------------------------
                                   John E. Vollmer III, Vice President

                               UTI MANAGEMENT SERVICES, L.P.

                               By:  UTICO HARD ROCK BORING,
                                    as Sole General Partner

                                    By:
                                       -------------------------------------
                                        John E. Vollmer III, Vice President

                               NORTON DRILLING, L.P.

                               By:    Norton GP, L.L.C., as sole General Partner

                                      By: Norton Drilling Services, Inc.,
                                          its sole Member

                                          By:
                                             -------------------------------
                                          Name:
                                               -----------------------------
                                          Title:
                                                ----------------------------

SECOND AMENDMENT TO LOAN & SECURITY AGREEMENT
<PAGE>   16

                                SCHEDULE TO GRID

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</TABLE>

FIRST AMENDMENT TO LOAN & SECURITY AGREEMENT<PAGE>

                                                                     Exhibit 4.4

                                                                  EXECUTION COPY

                AMENDMENT No. 2 dated as of June 1, 1995, to the Pooling and
        Servicing Agreement dated as of June 1, 1993, among FIRST DEPOSIT
        NATIONAL BANK, a national banking associations, as Seller and Servicer,
        PROVIDIAN NATIONAL BANK (formerly known as First Deposit National Credit
        Card Bank), a national banking association, as Seller, and BANKERS TRUST
        COMPANY, a New York banking corporation, as Trustee.

        WHEREAS the Sellers, the Servicer and the Trustee are parties to the
Pooling and Servicing Agreement dated as of June 1, 1993, as amended by the
AMENDMENT No. 1 dated as of May 1, 1994 (as so amended, the "Agreement"); and

        WHEREAS the Sellers, the Servicer and the Trustee now wish to amend the
Agreement as set forth herein;

        NOW, THEREFORE, the Sellers, the Servicer and the Trustee hereby agree
as follows:

                                   ARTICLE I

                                  DEFINITIONS

        SECTION 1.01. Defined Terms Not Defined Herein. All Capitalized terms
                      ---------------------------------
used herein that are not defined herein shall have the meaning ascribed to them
in the Agreement.

                                  ARTICLE II

                            AMENDMENTS TO AGREEMENT

        SECTION 2.01. Amendments to Section 1.01 of the Agreement. Section 1.01
                      --------------------------------------------
of the Agreement is hereby amended as follows:

                (a) The definition of the term "Collections" is amended and
        restated in its entirety to read as follows:

                   "Collections" shall mean (a) all payments (excluding
                    -----------
        Insurance Proceeds and other amounts constituting Recoveries of
        Principal Receivables or Finance Charge Receivables) received by the
        Servicer in

<PAGE>

                                                                               2

respect of the Receivables, in the form of cash, checks (to the extent
collected), wire transfers, ATM transfers or other form of payment in accordance
with the Lending Agreement in effect from time to time on any Receivables and,
(b) with respect to any Monthly Period, a portion, determined pursuant to
Section 2.07(i), of the Interchange paid to the Sellers through the MasterCard
System, the VISA System and any other similar entity's or organization's system
relating to consumer revolving credit card accounts with respect to such Monthly
Period.

        (b) the definition of the term "Finance Charge Receivables" is amended
and restated in its entirety to read as follows:

        "Finance Charge Receivables" shall mean, with respect to any Monthly
         --------------------------
Period, all amounts billed to the Obligors on any Account at the beginning of
such Monthly Period and in respect of (i) Periodic Finance Charges, (ii)
Returned Cash Advance Check Fees, (iii) Late Fees, (iv) Overlimit Fees, (v)
Returned Payment Check Fees and (vi) all other fees and charges (excluding
Principal Receivables). Collections of Finance Charge Receivables, with respect
to any Monthly Period, shall include a portion, determined pursuant to Section
2.07(i), of the Interchange paid to the Sellers through the MasterCard System,
the VISA System and any other similar entity's or organization's system relating
to consumer revolving credit card accounts with respect to such Monthly Period.

        (c) The definition of the term "Interchange" is amended and restated in
its entirety to read as follows:

        "Interchange" shall mean interchange fees payable to any Seller, in its
         -----------
capacity as credit card issuer, through the MasterCard System, the VISA System
and any other similar entity's or organization's system relating to consumer
revolving credit card accounts in connection with cardholder charges for goods
and services.

        SECTION 2.02. Amendment to Section 2.01 of the Agreement. The first
                      -------------------------------------------
sentence of Section 2.01 of the Agreement is hereby amended and restated in its
entirety to read as follows:
<PAGE>

                                                                               3

        By execution of this Agreement, each of the Sellers does herby sell,
        transfer, assign, set over and otherwise convey to the Trustee, on
        behalf of the Trust, for the benefit of the Certificateholders, all its
        right, title and interest in, to and under the Receivables existing at
        the close of business on the Trust Cut-Off Date, in the case of
        Receivables arising in the Initial Accounts owned by such Seller, and on
        each Additional Cut-Off Date, in the case of Receivables arising in the
        Additional Accounts owned by such Seller, and in each case thereafter
        created from time to time until the termination of the Trust, all moneys
        due or to become due and all amounts received with respect thereto and
        all proceeds (including "proceeds" as defined in the UCC) thereof and
        all of such Seller's rights, title and interest in and to the portion
        determined pursuant to Section 2.07(i) of all Interchange paid to such
        Seller.

            SECTION 2.03.  Amendments to Section 2.07 of the Agreement.  (a)
                           --------------------------------------------
Section 2.07(d) of the Agreement is hereby amended and restated in its entirety
to read as follows:

                (d)  Delivery of Collections.  In the event that such Seller
                     -----------------------
        receives Collections (other than Interchange to be included as
        Collections of Finance Charge Receivables pursuant to Section 2.07(i)),
        such Seller agrees to pay the Servicer all such Collections as soon as
        practicable after receipt thereof but in no event later than two
        Business Days after the Date of Processing by the Seller.

            (b)  Section 2.07 of the Agreement is hereby amended by the addition
of the following paragraph at the end of such Section:

                (i)  Interchange.  On or prior to each Determination Date,
                     ------------
        beginning with the first Determination Date following the June 1995
        Monthly Period, such Seller shall notify the Servicer (or notify another
        Seller if such other Seller is notifying the Servicer on behalf of all
        Sellers) of the amount of Interchange to be included as Collections of
        Finance Charge Receivables with respect to the preceding Monthly Period,
        beginning with the June 1995 Monthly Period, which shall be equal to the
        amount of Interchange paid to such Seller with respect to such Monthly
        Period multiplied by a fraction the numerator
<PAGE>

                                                                               4

of which is the aggregate amount of cardholder charges for goods and services
with respect to such Monthly Period in the Accounts and the denominator of which
is the aggregate amount of cardholder charges for goods and services with
respect to such Monthly Period in all consumer revolving credit card accounts
owned by such Seller. In the event that information with respect to Interchange
with respect to any Monthly Period is not available to such Seller in sufficient
time prior to the immediately following Determination Date to enable such Seller
to complete the necessary servicing computations and reports relating to such
Monthly Period, such Seller shall notify the Servicer (or other Seller, as
described above) of the amount of Interchange to be included as Collections of
Finance Charge Receivables based on an estimate of Interchange for such Monthly
Period. Such Seller shall make any required adjustment to the amount of
Interchange to be included as Collections of Finance Charge Receivables provided
in such Seller's notice to the Servicer (or other Seller) on the second
following Determination Date, to the extent any such computations or reports
were based on an estimate; provided, however, that no such adjustment shall be
                           --------- --------
in an amount that would cause the amount of Interchange to be included as
Collections of Finance Charge Receivables to be a negative number or cause the
Trust to be obligated to make any payment in respect of Interchange to such
Seller or the Servicer.

        SECTION 2.04.  Amendment to Section 2.08 of the Agreement. Section
                       -------------------------------------------
2.08(d)(iii) of the Agreement is hereby amended and restated in its entirety to
read as follows:

        (iii) in the case of Additional Accounts, to the extent required by
Section 4.03, the Participating Sellers shall have deposited in the Collection
Account all Collections (other than Interchange to be included as Collections of
Finance Charge Receivables pursuant to Section 2.07(i) with respect to such
Additional Accounts since the Additional Cut-Off Date;

        SECTION 2.05. Amendment to Section 3.03 of the Agreement. Section
                      -------------------------------------------
3.03(i) of the Agreement is hereby amended and restated in its entirety to read
as follows:

        (i) Protection of Certificateholders' Rights. The Servicer shall take no
            -----------------------------------------
action which, nor omit to take
<PAGE>

                                                                               5

        any action the omission of which, would substantially impair the rights
        of Certificateholders in any Receivable or Account, nor shall it, except
        in the ordinary course of its business and in accordance with the
        Lending Guidelines, reschedule, revise or defer Collections (other than
        Interchange to be included as Collections of Finance Charge Receivables
        pursuant to Section 2.07(i)) due on the Receivables.

        SECTION 2.06.  Amendments to Section 4.03 of the Agreement. (a) The
                       --------------------------------------------
first three sentences of Section 4.03(a) of the Agreement are hereby amended
and restated in their entirety to read as follows:

        The Servicer will apply or will instruct the Trustee to apply all funds
        on deposit in the Collection Account as described in this Article IV and
        in each Supplement. Except as otherwise provided below, the Servicer
        shall deposit Collections into the Collection Account no later than the
        second Business Day following the Date of Processing of such
        Collections, except for Collections consisting of Interchange, the
        Certificateholders' allocable portion of which the Servicer shall
        deposit into the Collection Account no later than 12:00 noon, New York
        City time, on the Transfer Date and the Sellers' allocable portion of
        which the Sellers shall retain. Subject to the express terms of any
        Supplement, but notwithstanding anything else in this Agreement to the
        contrary, for so long as FDNB remains the Servicer and (x) maintains a
        certificate of deposit rating of A-1 or better by Standard & Poor's and
        P-1 by Moody's, or (y) FDNB has provided to the Trustee a letter of
        credit covering collection risk of the Servicer acceptable to the Rating
        Agency (as evidenced by a letter from the Rating Agency), the Servicer
        need not make the daily deposits of Collections into the Collection
        Account as provided in the preceding sentence, but may make a single
        deposit in the Collection Account in immediately available funds not
        later than 12:00 noon, New York City time, on the Transfer Date, except
        for the Sellers' allocable portion of Collections consisting of
        InterchaNge, which the Sellers shall retain.

        (b) The first sentence of Section 4.03(c) of the Agreement is hereby
amended and restated in its entirety to read as follows:

<PAGE>

                                                                               6

          On the earlier of (A) the second Business Day after the Date of
          Processing and (B) the day on which the Servicer actually deposits any
          collections into the Collection Account, the Servicer will pay to the
          Sellers (i) the Sellers' allocable portion of Collections of Finance
          Charge Receivables (except for such Collections consisting of
          Interchange, to the extent that the Sellers have retained their
          allocable portion thereof pursuant to Section 4.03(a)) and (ii) the
          Sellers' allocable portion of Collections of Principal Receivables;
          provided, however, that, in the case of Collections of Principal
          --------  -------
          Receivables allocated to the Sellers' Interest and any Shared
          Principal Collections that would otherwise be paid to the Sellers
          pursuant to Section 4.04, such amounts shall be paid to the Sellers
          only if the Sellers' Participation Amount (determined after giving
          effect to any Principal Receivables transferred to the Trust on such
          date) exceeds zero.

                                  ARTICLE III

                                 MISCELLANEOUS

        SECTION 3.01.  Ratification of Agreement. As amended by this Amendment,
                       -------------------------
the Agreement is in all respects ratified and confirmed and the Agreement as
amended by this Amendment shall be read, taken and construed as one and the
same instrument.

        SECTION 3.02.  Amendment. The Agreement any be amended from time to time
                       ---------
only if the conditions set forth in Section 13.01 of the Agreement are
satisfied.

        SECTION 3.03   Counterparts. This Amendment may be executed in two or
                       ------------
more counterparts, and by different parties on separate counterparts, each of
which shall be an original, but all of which shall constitute one and the same
instrument.

        SECTION 3.04   GOVERNING LAW. THIS AMENDMENT SHALL BE CONSTRUED IN
                       -------------
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS
CONFLICT OF LAW PROVISIONS, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE

<PAGE>

                                                                               7

PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

        IN WITNESS WHEREOF, the Sellers, the Servicer and the Trustee have
caused this Amendment to be duly executed by their respective officers as of the
day and year first above written.

                                FIRST DEPOSIT NATIONAL BANK,
                                Seller and Servicer,

                                     by   /s/ David J. Petrini
                                          ---------------------------
                                          Name: David J. Petrini
                                          Title: Senior Vice President and
                                                 Senior Financial Officer

                                PROVIDIAN NATIONAL BANK,
                                Seller,

                                     by   /s/ David J. Petrini
                                          ---------------------------
                                          Name:  David J. Petrini
                                          Title: Senior Vice President and
                                                 Senior Financial Officer

                                BANKERS TRUST COMPANY,
                                Trustee,

                                     by   /s/ Donielle Forey
                                          ---------------------------
                                          Name:  Donielle Forey
                                          Title: Assistant Treasurer

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