Document:

<PAGE>

                                                                   EXHIBIT 10.15

                   [LETTERHEAD OF SIDLEY AUSTIN BROWN & WOOD]

                                December 6, 2001

By Federal Express

            Re:     Watson Pharmaceuticals, Inc.
                    ----------------------------

To the Parties listed on Annex A hereto:

     Societe Generale, Watson Pharmaceuticals, Inc. and Wachovia Bank N.A.
("Wachovia") have agreed that Societe Generale will resign as administrative
agent under the Amended and Restated Credit Agreement dated as of August 28,
2000 (the "Agreement") among Watson Pharmaceuticals, Inc., the Lenders, SG Cowen
Securities Corporation, Societe Generale, First Union National Bank and Summit
Bank, and Wachovia will succeed Societe Generale as administrative agent under
such Agreement. The transition from Societe Generale to Wachovia as
administrative agent under the Agreement will occur over the next thirty (30)
days and will be an orderly transition.

      Pursuant to the terms of the Agreement, Societe Generale is required to
give thirty (30) days notice of its resignation. Enclosed please find a letter
from Societe Generale notifying you of its resignation as administrative agent
under the Agreement. The transition from Societe Generale to Wachovia as
administrative agent should be finalized sometime in the beginning of January
2002.

     Please do not hesitate to contact me on (212) 906-2168 with questions or
comments regarding this matter.

                                         Kind regards,

                                         /s/ CARLA A. VARNER

                                         Carla A. Varner

Enclosure

<PAGE>

                        [LETTERHEAD OF SOCIETE GENERALE]

                                December 5, 2001

Watson Pharmaceuticals, Inc.
311 Bonnie Circle
Corona, California 92880-2882
Attention:  Robert Funsten

Cooley Godward LLP
One Maritime Plaza, 20th Floor
San Francisco, California 94111-3580
Attention:  Peter H. Carson

To the Lenders listed on Annex A hereto:

      Reference is hereby made to the Amended and Restated Credit Agreement
dated as of August 28, 2000 (as further amended, supplemented or modified from
time to time, the "Credit Agreement") among WATSON PHARMACEUTICALS, INC., a
Nevada Corporation (the "Borrower"), the financial institutions from time to
time party thereto, whether by execution of the Agreement or an Assignment and
Acceptance (the "Lenders"), SG COWEN SECURITIES CORPORATION, in its capacity as
arranger and book runner (in such capacity, the "Arranger"). SOCIETE GENERALE
("SG"), in its capacity as administrative agent for the Lenders (in such
capacity, the "Administrative Agent"), FIRST UNION NATIONAL BANK, in its
capacity as syndication agent for the Lenders (in such capacity, the
"Syndication Agent"), and SUMMIT BANK, in its capacity as documentation agent
for the Lenders. Capitalized terms used herein and not other defined herein
shall have the meanings ascribed to such terms in the Credit Agreement.

      Pursuant to Section 12.07(a) of the Credit Agreement, SG hereby gives you
notice of its resignation as Administrative Agent under the Credit Agreement.

                                         Sincerely,

                                         SOCIETE GENERALE

                                         BY: /s/ JOHN M. STACK
                                             --------------------------------
                                             Title:
                                                         John M. Stack
                                                         Managing Director<PAGE>

                                                                  EXHIBIT 10.3.5
                                                                  --------------

                                 Fifth Amendment

                                       To

                              Eagle Mountain Lease

                                     Between

                        Management & Training Corporation

                                       And

                              Kaiser Ventures Inc.

                             Effective July 1, 2001

<PAGE>

                            Fifth Amendment to Lease
                            ------------------------

         THIS AMENDMENT is made effective as of July 1, 2001, by and between
KAISER VENTURES INC. (Landlord) and MANAGEMENT AND TRAINING CORPORATION (Tenant)
to that certain Eagle Mountain Lease between Landlord and Tenant dated November
16, 1987 as modified by the FIRST AMENDMENT to Eagle Mountain Lease between
Landlord and Tenant dated effective July 1, 1990, as further modified by the
SECOND AMENDMENT to Eagle Mountain Lease between Landlord and Tenant dated
effective November 10, 1992, as further modified by the THIRD AMENDMENT TO Eagle
Mountain Lease between Landlord and Tenant effective November 16, 1997 and as
further modified by the FOURTH AMENDMENT to Eagle Mountain Lease between
Landlord and Tenant effective February 1, 1999 (collectively, the Lease").

It is expressly covenanted and agreed by and between Landlord and Tenant as
follows:

Article II - Term
-----------------

           3.01    This section is amended to extend this Lease for twelve (12)
                   months. This lease will, therefore, continue through June 30,
                   2002. Accordingly, Section 3.01 is hereby amended to read in
                   its entirety as follows:

                   "Unless sooner terminated as provided in this Lease, the term
                   of this Lease shall end at midnight, June 30, 2002.

Article XXIV - Notices
----------------------

           24.01   This article is amended to change the Tenant's name and
                   address as follows:

                   Tenant:  Management and Training Corporation
                            P.O. Box 10
                            500 North Marketplace Drive
                            Centerville, UT  84014
                            Attention:  Vice President

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<PAGE>

Confirmation of All Other Lease Provisions
------------------------------------------

           Except as expressly provided herein, all other provisions of the
Lease as amended to date, remain in full force and effect and are unchanged by
this Amendment.

           IN WITNESS WEREOF, the parties have executed this FIFTH AMENDMENT TO
THE LEASE to be effective as of the day and year first above written
notwithstanding the actual date of signature.

MANAGEMENT AND TRAINING CORPORATION

By:  /s/Ron Russell                                   Date:  7/9/01
     --------------------------------                        -------------

Its: Sr. Vice President Corrections
     --------------------------------

KAISER VENTURES INC.

By:  /s/ Terry L. Cook                                Date:  7/23/01
     --------------------------------                        -------------

Its: Exec. Vice President
     --------------------------------<PAGE>

                                                                  Exhibit 10.9.1

                              Separation Agreement
                              --------------------

         This SEPARATION Agreement ("Agreement") is made and entered into by and
between ANTHONY SILVA ("Executive") and BUSINESS STAFFING, Inc. (the "Company")
as of February 28/th/, 2002.

                                    Recitals

         A.  Executive is currently employed with the Company pursuant to the
terms of that certain Employment Agreement between the Company and Executive
dated effective January 1, 2002 (the " Employment Agreement"). The Company is
currently leasing his services to Kaiser Ventures LLC ("Kaiser").

         B.  The Company and Executive have mutually agreed to wind-down
Executive's time commitment to the Company resulting in the termination of
Executive's employment with the Company, without cause, effective February 28,
2002. The Company and Executive have agreed to terminate and supercede the
Employment Agreement by this Agreement.

         NOW, THEREFORE, based upon the foregoing and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Executive and the Company agree as follows:

         1.  Acknowledgment of Recitals. Executive and the Company agree and
acknowledge that the facts set forth in the Recitals above are true and correct
and are incorporated herein by this reference.

         2.  Termination of Employment. Executive and the Company agree and
acknowledge that Executive's employment with the Company shall terminate
effective as of the close of business on February 28, 2002.

         3   Executive's Base Compensation. While an employee of the Company,
the Company shall pay Executive his current annual salary of $126,228 through
February 28, 2002. All payments to Executive (including salary and the severance
payments specified in Paragraph 5) shall be made in accordance with the
Company's normal payroll procedures and shall be less all appropriate
deductions, such as social security, federal and state income tax withholding,
medical and life insurance premiums.

         4.  Benefits. Executive will continue to receive medical, dental, life
and disability insurance benefits (at their current levels except that the
benefits programs may be modified to the extent that the benefit programs may
change for the executive officers of the Company) at the Company's expense
through February 28, 2003, subject to Executive's payment of any necessary
premium participation (currently $10.00 per month) or deductible as generally
applicable to other employees of the Company; provided, however, Executive shall
have the ability to terminate receipt of any benefit upon written notice to the
Company. It may be necessary for Executive to elect to receive health benefits
pursuant to COBRA. If a COBRA election is necessary, the Company will pay the
necessary COBRA premiums less Executive's normal monthly premium participation
for one year. A lump sum payment of Executive's premium participation for twelve
(12) months of an aggregate of $120.00 will be

                                        1

<PAGE>

deducted from his lump sum severance payment. After February 28, 2003, and if a
COBRA election was not previously required to be made by Executive, the Company
will offer to Executive the opportunity to continue his medical insurance
benefits subject to and in accordance with COBRA. After termination of
employment, Executive will not be able to participate in the Company's 401(k),
Money Purchase Pension Plan, and Supplemental Executive Retirement Plan.

          5.  Severance. Upon Executive's termination of employment as of
February 28, 2002, Executive shall be paid the following as severance benefits:

              (a) any accrued and unused vacation as of February 28, 2002, per
the Company's records; provided however the maximum amount of accrued and unused
vacation that the Company will pay is three (3) weeks; plus.

              (b) $192,376 (representing one year's annual base salary at
$126,228 plus 46.7% of Executive's current base salary for an amount
representing the average percentage bonus over five (5) years ending for the
2000 bonus year as applied to Executive's base salary, plus one year's car
allowance).

          6.  Consulting. Kaiser shall execute and deliver to Executive that
certain Consulting Agreement, to be dated effective as of March 1, 2002, in the
form attached hereto as Exhibit "A."
                        ----------

          7.  Long Term Transaction Incentive Plan. Executive acknowledges and
agrees that his participation in the Company's Long Term Transaction Plan
("TIP") in accordance with its terms as set forth in Schedule 1 to the TIP was
                                                     ----------
reduced by forty percent (40%) effective December 1, 2001. Accordingly, the
participation points of Executive were reduced to 7.2 from 12 commencing
December 1, 2001. No participation points that accrued prior to December 1,
2001, shall be reduced. Effective January 15, 2002, the TIP was terminated as to
future unearned payments, if any, under the TIP. In exchange for a release under
the TIP, Executive has been or will be issued 72 Class C Units and 48 Class D
Units in Kaiser. On March 1, 2003, or earlier if the Consulting Agreement is
terminated for any reason, Executive's 72 Class C Units in Kaiser will be
automatically converted into 72 Class D Units. A description of the Class C
Units and the Class D Units and the Subscription Agreement to be executed by
Executive for the Class C and Class D Units are attached hereto as Exhibit "B."
                                                                   ----------
The agreement reflected in Paragraph 7 shall be deemed an amendment to
Executive's participation in the TIP.

          8.  Death Benefits. In the event of Executive's death, the Company
shall pay to Executive's personal representative or his estate, Executive's
salary and benefits through the end of the month in which the death occurs and
the severance obligations to Executive as if he were alive on February 28, 2002.

          9.  Disability Benefits. In the event of the disability of Executive
for any reason, the Company shall continue to pay to Executive his salary and
benefits through February 28, 2002, as provided herein, less short-term
disability payments. Severance and other payments shall be made as provided in
this Agreement.

          10. Indemnification. The Company shall continue to indemnify Executive
for Executive's work and actions during his employment by the Company and Kaiser
and

                                       2

<PAGE>

any predecessor of Kaiser in accordance with the standards, terms and
limitations of: (i) the Company's Certificate of Incorporation as in effect on
the date hereof to the same extent as if Executive had remained an officer of
the Company; (ii) the Company's Bylaws in effect on the date hereof to the same
extent as if Executive had remained an officer; and (iii) the Indemnification
Agreement dated effective July 10, 2001, between Kaiser and Executive.

          11. Surrender of Company Property. Upon termination of his employment,
Executive shall immediately return to the Company equipment, materials, credit
cards, and other items belonging to the Company other than the Company's cell
phone which Executive may retain but Executive shall become responsible for the
payment of all cell phone charges after February 28, 2002. In addition,
notwithstanding the foregoing, Executive may retain such records and files as
may be necessary to perform any consulting services so long as he serves as a
consultant to Kaiser or any affiliate of the Company.

          12. General Release. Upon the termination of Executive's employment,
he and the Company shall execute and deliver the general release and agreement
attached hereto as Exhibit "C."
                   ----------

          13. Independent Judgment Made by Executive. Executive represents and
acknowledges that in executing this Agreement he does not rely and has not
relied upon any representation or statement of the Company or by any of the
Company's employees, agents, representatives, or attorneys with regard to the
subject matter, basis or effect of this Agreement.

          14. Conduct. Executive agrees that he will not speak disparagingly of
any of the Company, its employees and duties, and the Company agrees it will not
speak disparagingly about Executive. If requested by Executive, the Company will
provide Executive a reference letter as mutually determined by the Company's
President and Chief Executive Officer and Executive. Executive may list the
Company's President and Chief Executive Officer and the Company's Executive Vice
President as references in promotional materials Executive may use.

          15. General Confidentiality.

              a. Executive's Obligations. Executive agrees that (a) except as
provided in this Agreement Executive shall maintain the confidential nature of
any Proprietary Information received or acquired by him, and (b) Executive shall
use such Proprietary Information solely for the purpose of meeting his
obligations under this Agreement and the Consulting Agreement referenced in
Paragraph 6 above and not in connection with any other business or activity.
"Proprietary Information" means all oral, written or recorded information about
or related to the Company, Kaiser or any of their Affiliates or its or their
technology, assets, liabilities, or business, whether acquired before or after
the date hereof, and regardless of the manner in which it is acquired, together
with any documents or other materials prepared by Executive which contain or
reflect such information. After termination of employment upon demand of the
Company, Executive agrees to return or destroy any and all materials containing
any Proprietary Information.

                                       3

<PAGE>

              b. The Company's Obligations. The Company agrees that it shall
maintain and provide information regarding Executive in accordance with
generally accepted industry and business practices.

              c. Limitations on Confidential Obligations and Use Restrictions.
The restrictions in Paragraph 15(a) above do not apply to information which the
Executive can demonstrate (i) is then in the public domain by acts not
attributable to Executive or (ii) is hereafter received on an unrestricted basis
by such Executive from a third party source who, to Executive's knowledge after
due inquiry, is not and was not bound by confidentiality obligations to the
Company, Kaiser or any Affiliate thereof. In addition, Executive, the Company
and Kaiser are permitted to disclose any Proprietary Information that is
necessary in the defense or prosecution of any legal action.

              d. Actions if Disclosure Required. If Executive is required by law
to make any disclosure otherwise prohibited hereunder, such party shall use its
best efforts to provide the other with prompt prior notice where possible so
that (a) the other party (with the reasonable cooperation of the party required
to make such disclosure) may seek an appropriate protection order or other
remedy and/or (b) the parties can seek in good faith to agree on the appropriate
scope and approach to disclosure. If a protective order or other remedy is not
obtained, the party required to make such disclosure may furnish only that
portion of information protected hereby which it is legally compelled to
disclose and shall use its reasonable efforts to obtain confidential treatment
for all information so disclosed.

              e. Injunction. Each party agrees that remedies at law may be
inadequate to protect against breach of this Paragraph 15, and hereby agrees to
the granting of injunctive relief without proof of actual damage.

          16. Expenses. It is further agreed for the above consideration that
Executive and the Company will bear their own costs, expenses and attorneys'
fees in connection with the negotiation and execution on this Agreement and all
the events and circumstances which form the basis for execution of this
Agreement.

          17. Opportunity to Consult with Attorney. Executive hereby warrants
that prior to the execution of this Agreement, he was given the opportunity to
consult with an attorney of his own choosing and review the contents and legal
effect of this Agreement with an attorney and is executing this Agreement
voluntarily, with full and complete knowledge of the legal and binding effect of
this Agreement.

          18. No Admission of Liability. This Agreement shall not in any way be
construed as an admission by the Company, Kaiser or Executive that they
respectively have acted wrongfully or have any rights whatsoever against each
other except as expressly provided herein.

          19. Severability. The provisions of this Agreement are severable, and
if any part of it is found to be unenforceable, all other provisions shall
remain fully valid and enforceable.

          20. Entire Agreement. This Agreement, the exhibits hereto, and all
other documents referred to herein, (including, but not limited to, the
agreements for, the Indemnification Agreement, the Company's 401(k) Plan, the
Company's Money Purchase

                                       4

<PAGE>

Plan, the Company's Supplemental Executive Retirement Plan, the TIP, and the
Operating Agreement for Kaiser as they each may be amended from time to time.)
sets forth the entire agreement between the parties hereto, with respect to the
subject matters covered by this Agreement.

          21. Employment Agreement Termination. The Employment Agreement is
terminated and superceded by this Agreement.

          22. Headings. The headings throughout this Agreement are for
convenience and reference only and they shall not be construed to add to or
limit the meaning of any provision of this Agreement.

          23. Definition of the Company and Third Party Beneficiary. For purpose
of this Agreement, all references to the Company shall be deemed to include all
affiliates and subsidiaries of the Company. The parties agree that Kaiser is a
third party beneficiary of this Agreement and may take any and all actions to
enforce the terms of this Agreement. Kaiser shall also execute this Agreement
for the limited purpose of agreeing to those provisions of this Agreement that
are expressly applicable to Kaiser.

          24. Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of the State of California.

          25. Arbitration of Disputes. If Executive and the Company cannot
resolve a dispute (whether arising in contract or tort or any other legal
theory, whether based on federal, state or local statute or common law and
regardless of the identities of any other defendants) that in any way relates to
or arises out of this Agreement, the termination of Executive's employment
relationship with the Company, Kaiser or any Affiliate thereof, the General
Release Agreement, (without limiting the generality of any other Paragraph
herein), then such dispute shall be settled as follows:

              a. The Company and Executive agree to jointly select a judicial
officer who is affiliated with the Judicial Arbitration and Mediation Service,
or such other equivalent organization as the Company and Executive may mutually
select, to act as the trier of fact and judicial officer in such dispute
resolution;

              b. If the Company and Executive are unable to agree upon a
particular judicial officer, then the decision shall be made by the chief
executive officer of the Judicial Arbitration and Mediation Service, after
consulting with the Company and Executive;

              c. The Company and Executive shall have the same rights of
discovery as if the dispute were being resolved in the Superior Court of the
State of California. However, the judicial officer shall, on his own motion, or
the request of either the Company and Executive, have the authority to extend or
reduce the time periods therefore; and,

              d. The judicial officer serving hereunder shall be designated as a
referee under the provisions of Title VIII, Chapter 6 of the California Code of
Civil Procedure (Sections 638 through 645. 1, inclusive). Payment for the
services of the judicial officer and the rights and procedure of appeal, and/or
other review of the decision, shall be made as provided in such sections.

                                        5

<PAGE>

         The judicial officer shall have the right to grant injunctive relief,
specific performance and other equitable remedies.

         In addition, the prevailing party in any legal action shall be
reimbursed for all reasonable costs incurred in such legal action, including
reasonable attorneys' fees.

         IN WITNESS WHEREOF, the parties have executed this Agreement to be
effective as of the day and year written above notwithstanding the actual date
of signature.

PLEASE READ CAREFULLY. THIS AGREEMENT INCLUDES A RELEASE OF ALL KNOWN OR
UNKNOWN CLAIMS.

Executed at Ontario, California                Executed at Ontario, California

Dated:   February 28, 2002                     Dated:   February 28, 2002
       -------------------                            ------------------------

"Executive"                                    "Company"
                                               Business Staffing, Inc.

     /s/ Anthony Silva                         By: /s/ Richard E. Stoddard
------------------------------------               -----------------------
      Anthony Silva                                Richard E. Stoddard
                                                   President & CEO

                                               Executed at Ontario, California

                                               Dated:  February 28, 2002
                                                      ------------------------

    Approved on Behalf of Kaiser Ventures LLC Only as to those Provisions of
           this Agreement that are Specifically Applicable to Kaiser

                                               By: /s/ Richard E. Stoddard
                                                   ---------------------------
                                                   Richard E. Stoddard
                                                   President & CEO

                                               Dated:_________________________

              Approved as to Form on Behalf of Kaiser Ventures LLC

                                               By: /s/ Todd G. Cole
                                                   ---------------------------
                                                   Todd G. Cole, Chairman,
                                                   Human Relations Committee

                                        6

<PAGE>

                        Exhibits will be furnished to the

                 Securities and Exchange Commission upon request

                                        7

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