Document:

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                                                                   EXHIBIT 10.12

                                AMENDMENT TO THE
                              AMENDED AND RESTATED
                           CHANGE IN CONTROL AGREEMENT

         This Amendment (the "Amendment") to the Amended and Restated Change in
Control Agreement dated ____________, 2000 (the "Agreement") between OSCA, Inc.,
a Delaware corporation (the "Company" and, together with any of its subsidiaries
or successors in interest, including a successor in a Change in Control (as
defined in the Agreement), the "Employer"), and (the "Executive") is made as of
_________, 2001.

         WHEREAS, the benefits provided to the Executive under the Agreement
that are deemed to be "excess parachute payments" under the Internal Revenue
Code of 1986, as amended (the "Code"), subject the Executive to excise taxes;
and

         WHEREAS, in order that the Executive may receive the full benefits
intended by the Agreement and the Company's Stock Compensation Plan, the Company
wishes to bear the cost of such excise tax, if any, for which the Executive is
responsible and to make payments to the Executive to the extent necessary to
place the Executive in essentially the same financial position after the payment
of such taxes as he would have been in if such excise tax had not been
applicable;

         WHEREAS, Executive wishes to receive such payments;

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

         (a) Notwithstanding any other provisions of the Agreement, if the
Executive becomes entitled to receive a Severance Payment under the Agreement
and if the Severance Payment and any other benefits to which the Executive will
be entitled under the Agreement (collectively with the Severance Payment,
referred to herein as the "Benefits") will be subject (in whole or in part) to
an excise tax (the "Excise Tax") imposed by section 4999 of the Code, the
Employer shall pay to the Executive an additional amount (the "Make Whole
Payment") such that the net amount retained by the Executive, after deduction of
(i) any Excise Tax on the Benefits and (ii) any federal, state and local income
and employment taxes and Excise Tax upon the Make Whole Payment, shall be equal
to the Benefits.

         (b) For purposes of determining whether any of the Benefits will be
subject to the Excise Tax and the amount of such Excise Tax, (i) all of the
Benefits shall be treated as "parachute payments" (within the meaning of section
280G(b)(2) of the Code) unless, in the opinion of tax counsel to the Company
("Tax Counsel") reasonably acceptable to the Executive, such payments or
benefits (in whole or in part) do not constitute parachute

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payments, including by reason of section 280G(b)(4)(A) of the Code, (ii) all
"excess parachute payments" within the meaning of section 280G(b)(l) of the Code
shall be treated as subject to the Excise Tax unless, in the opinion of Tax
Counsel, such excess parachute payments (in whole or in part) represent
reasonable compensation for services actually rendered (within the meaning of
section 280G(b)(4)(B) of the Code) in excess of the "Base Amount" (within the
meaning set forth in section 280G(b)(3) of the Code) allocable to such
reasonable compensation, or are otherwise not subject to the Excise Tax, and
(iii) the value of any noncash benefits or any deferred payment or benefit shall
be determined by Tax Counsel in accordance with the principles of sections
280G(d)(3) and (4) of the Code. For purposes of determining the amount of the
Make Whole Payment, the Executive shall be deemed to pay federal income tax at
the highest marginal rate of federal income taxation in the calendar year in
which the Make Whole Payment is to be made and state and local income taxes at
the highest marginal rate of taxation in the state and locality of the
Executive's residence on the date of termination of the Executive's employment
(or if there is no date of termination, then the date on which the Make Whole
Payment is calculated for purposes of this Section), net of the maximum
reduction in federal income taxes which could be obtained from deduction of such
state and local taxes.

         (c) In the event that the Excise Tax is finally determined to be less
than the amount taken into account hereunder in calculating the Make Whole
Payment, the Executive shall repay to the Employer, within five business days
following the time that the amount of such reduction in the Excise Tax is
finally determined, the portion of the Make Whole Payment attributable to such
reduction (plus that portion of the Make Whole Payment attributable to the
Excise Tax and federal, state and local income and employment taxes imposed on
the Make Whole Payment being repaid by the Executive, to the extent that such
repayment results in a reduction in the Excise Tax and a dollar-for-dollar
reduction in the Executive's taxable income and wages for purposes of federal,
state and local income and employment taxes. In the event that the Excise Tax is
determined to exceed the amount taken into account hereunder in calculating the
Make Whole Payment (including by reason of any payment the existence or amount
of which cannot be determined at the time of the Make Whole Payment), the
Employer shall make an additional Make Whole Payment in respect of such excess
(plus any interest, penalties or additions payable by the Executive with respect
to such excess) within five business days following the time that the amount of
such excess is finally determined. The Executive and the Employer shall each
reasonably cooperate with the other in connection with any administrative or
judicial proceedings concerning the existence or amount of liability for Excise
Tax with respect to the Benefits.

         (d) The Make Whole Payment provided for herein shall be made not later
than the "Payment Day." The Payment Day shall be the thirtieth day following the
date of termination of employment. Notwithstanding the preceding provisions of
this Amendment, if the amount of the Make Whole Payment cannot be finally
determined on or before the Payment Day, the Employer shall pay to the Executive
on the Payment Day an estimate, as determined in accordance herewith, of the
minimum amount of the Make Whole Payment to which the Executive is clearly
entitled and shall pay the remainder of

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the Make Whole Payment as soon as the amount thereof can be determined but in no
event later than the thirtieth day after the Payment Day. In the event that the
amount of the estimated Make Whole Payment so made exceeds the amount
subsequently determined to have been due, Executive shall reimburse such excess
to the Employer no later than the thirtieth day after such determination is
made. At the time that any Make Whole Payment and any additional Make Whole
Payment is made hereunder, the Employer shall provide the Executive with a
written statement setting forth the manner in which any such payment was
calculated and the basis for such calculations including, without limitation,
any opinions or other advice the Company has received from Tax Counsel or other
advisors or consultants (and any such opinion or advice which is in writing
shall be attached to the statement).

         IN WITNESS WHEREOF, the parties hereto have executed this Amendment to
Change in Control Agreement as of the date first above written.

                                   OSCA, INC.

                                   By:
                                       -----------------------------------------
                                       Robert L. Hollier, President and Chief
                                       Executive Officer

                                   EXECUTIVE:

                                   ------------------------------------------LEASE AGREEMENT
                                 ---------------

1. PARTIES.  This Lease dated Aug. 28th, 2001, is made by and between PITTSBURGH
PROPERTIES,  LTD. an Ohio Limited  Partnership  (herein  called  "Lessor")  with
offices at 33 North  Third  Street,  Columbus,  Ohio  43215,  and XRG,  INC.,  a
Delaware corporation (herein called "Lessee").

2. PREMISES. Lessor does hereby lease to Lessee certain space (Premises),  known
as Suite 614 (as shown on attached Exhibit A), 100 Fifth Avenue,  Pittsburgh, PA
15222.

     Said Lease is subject to the terms,  covenants  and  conditions  herein set
forth and the Lessee covenants as a material part of the  consideration for this
Lease  to keep  and  perform  each  and all of the  said  terms,  covenants  and
conditions by it to be kept and performed.

3. TERM. The Term of this Lease shall be for five (5) years commencing September
1, 2001 and ending August 31, 2006. It is agreed that this Lease shall  continue
thereafter from year to year on the same terms and  conditions,  except that the
monthly  rent shall be  increased  by five (5%) per cent over that  amount to be
paid during the last calendar month of the preceding term,  unless either Lessor
or Lessee  elects to terminate  this Lease by delivering  written  notice to the
other not less than ninety (90) days before the end of any term.

4. RENT.  During the term of this Lease Lessee agrees to pay, in lawful money of
the United States, the following rent:

From  September 1, 2001 to and including  November 30, 2001,  $100.00 per month.
From  December 1, 2001 to and  including  August 31, 2004,  $1,031.00 per month.
From September 1, 2004 to and including August 31, 2006, $1,084.00 per month.

     All rent shall be due and payable on the first day of each and every month.
All  payments  shall be made  payable  to  PITTSBURGH  PROPERTIES  and mailed to
PITTSBURGH PROPERTIES, PO Box 710933, Columbus, OH 43271-0933.

5. LATE CHARGE.  All rents not received by the fifth (5th) day of each month, or
any invoice for other charges not paid when due, must be  accompanied  by a late
charge of ten percent (10%) of said  payment,  which payment shall be additional
rent and shall be due without demand.

6. SECURITY DEPOSIT.  Lessee has deposited with Lessor the sum of Three Thousand
Two Hundred  Fifty Two Dollars  ($3,252.00).  After the end of each of the first
two years of this lease term, Lessor will credit back to Lessee as a rent credit
$1,084.00 if no default has occurred on Lessee's part during the preceding year.
The  remaining  sum  shall  be held  by  Lessor  as  security  for the  faithful
performance by Lessee of all the terms, covenants,  and conditions of this Lease
to be kept and performed by Lessee during the term hereof, and may be applied by
Lessor,  in the event of Lessee's  default,  to any damage suffered by Lessor as
the result of Lessee's  default.  If Lessor uses,  applies or retains all or any
part of the security deposit due to a default by Lessee, Lessee will within five
(5) days after written demand therefore, deposit sufficient funds with Lessor to
restore the security deposit to its original amount.

7. TAXES, INSURANCE, AND INCREASES FOR OPERATING EXPENSES.

     During the Lease term and any renewal term, Lessee shall pay, as additional
rent,  Eighty  Dollars  ($80.00)  per  month  for  Lessee's  share of Taxes  and
Insurance.
     During  the  Lease  term  and  any  renewal  term,  Lessee  shall  pay  his
proportionate  share of any increases in operating expenses of the Building over
the base year  2000.  Operating  Expenses  shall  include  any and all costs and
expenses (except insurance, and real estate taxes) paid or incurred by Lessor in
connection with the operation,  management,  or maintenance of the Building. The
operating  expenses for each calendar  year shall be compared  annually with the
operating  expenses  for the base  year  and any  increase  over  the  operating
expenses for the base year shall be apportioned in the ratio of the net rentable
area leased by Lessee to the total net rentable area in the  Building.  Lessee's
proportionate  share of such  increases is 1.3%, and shall be paid within thirty
(30) days after the notice  from  Lessor.
     Lessee shall pay a monthly  estimate  prepared by Lessor and adjusted  from
time to time as  Lessor  deems  appropriate,  towards  the  amounts  due in this
Article  and said  estimate  shall be  considered  additional  rent.  An  annual
reconciliation of Operating Expenses shall be forwarded to Lessee indicating any
credit due Lessee or any additional monies owed to Lessor by Lessee.

8. USE.  Lessee shall use the Premises for general  business  purposes and shall
not use or permit the  Premises  to be used for any other  purpose  without  the
prior written consent of Lessor.

9.  COMPLIANCE WITH LAW. Lessee shall not use or permit the Premises to be used,
for any purpose which will in any way conflict with any law, statute, ordinance,
rule or regulation of any duly

<PAGE>

constituted authority, or which will. in Lessor's opinion,  adversely affect the
rentability or reputation of the Building.

10. ALTERATIONS AND ADDITIONS. Lessee shall not make any alterations,  additions
or  improvements to the Premises or any part thereof without the written consent
of Lessor.

11. REPAIRS

     11a. By taking  possession of the Premises,  Lessee accepts the Premises as
being in good  condition  and repair.  Lessee  shall,  at Lessee's sole cost and
expense,  keep the  Promises in good  condition  and repair,  damage from causes
beyond the reasonable control of Lessee and ordinary wear and tear excepted.

     11b.  Lessor  shall  maintain  and repair the  structural  portions  of the
Building,  all common areas of the Building,  and the air conditioning,  heating
and electrical systems installed or furnished by Lessor, unless such maintenance
and  repairs  are  caused  in part or in  whole by the  act,  neglect,  fault or
omission of any duty by the Lessee, its agents, employees or invitees.

12. LIENS. Lessee shall keep the Premises and the property in which the Premises
are located  free from any liens  arising out of any work  performed,  materials
furnished, or obligations incurred by Lessee.

13. ASSIGNMENT AND SUBLETTING.  Lessee shall not assign this Lease and shall not
sublet the Premises or any part thereof  without the written  consent of Lessor.
It shall be a condition to any consent by Lessor to an  assignment or subletting
that Lessee shall accompany such request with a certified check in the amount of
Two Hundred Dollars ($200.00) to reimburse Lessor for  administrative  and legal
expense for the review and preparation of necessary documents.

14.  TRANSFER OF LESSEES.  In the event the  Premises  leased to Lessee are less
than 2,000 square feet in area,  Lessor  reserves  the right,  at its option and
upon giving not less than thirty (30) days written notice to Lessee, to transfer
and remove  Lessee from Premises to other space of  substantially  the same size
and rent in the Building. Lessor shall bear all reasonable costs of said removal
and transfer.  Lessee may elect not to accept said transfer, in which case, this
lease 'shall terminate and both Lessee and Lessor shall be released from further
liability.

15. HOLD HARMLESS.  Lessee shall indemnify and hold Lessor harmless  against and
from any and all claims,  including  attorney  fees arising from Lessee's use or
occupancy of the Premises.

16.  SUBROGATION.  As long as their  respective  insurers so permit,  Lessor and
Lessee hereby mutually waive their  respective  rights of recovery  against each
other  for any  loss  insured  by fire,  extended  coverage  or  other  property
insurance policies existing for the benefit of the respective parties.

17. LIABILITY INSURANCE.  Lessee shall maintain in full force and effect, during
the term of this Lease or any extension thereof,  public liability insurance for
its own protection and for the protection of Lessor against injuries,  accidents
or causes  of action of every  nature  and kind  whatsoever  which are  normally
covered by  "owner-tenant"  liability  insurance that may arise from the use and
occupation  of, in and about the Premises,  by Lessee,  Insurance  shall be with
limits of not less than one million  dollars  ($1,000,000.00)  inclusive  of all
injuries or death to persons and damage to property of others  arising  from any
one  occurrence.  Lessor and Lessee shall be named as insured in the policies or
certificates of such coverage.

18.  SERVICES AND UTILITIES.  Provided that Lessee is not in default  hereunder,
Lessor  agrees to  furnish  to the  Premises  during  normal  business  hours on
generally  recognized  business  days,  as  determined  by  Lessor  at his  sole
discretion,  electricity  for normal lighting and fractional  horsepower  office
equipment,  heat and air  conditioning  as required in Lessor's  judgement,  and
janitorial service.
Lessor  shall also  maintain the  elevators  and common areas in the Building of
which the Premises are a part.  Lessee shall not be entitled to any reduction of
rent or to damages by reason of Lessor's failure to furnish any of the foregoing
when such failure is caused by accident, breakage, repairs, or labor disputes of
any character, or by any other cause beyond the reasonable control of Lessor.

19. RULES AND REGULATIONS.  Lessee shall faithfully  observe and comply with all
rules and  regulations  that Lessor shall from time to time  promulgate  and are
currently as follows:

a. Lessee agrees that it, its employees, agents, patrons and invitees will not:

     1.  Obstruct  sidewalks,   entrances,   passages,  elevators,   vestibules,
stairways, corridors or halls.
     2.  Cover or  obstruct  windows  or doors or place any item or  article  on
window sills or convectors.
     3.  Attach or install any sign,  notice,  or  lettering  on any part of the
Premises or Building, without Lessor's approval.

<PAGE>

     4. Bring into or keep in the Building,  bicycles or other vehicles, animals
or birds of any kind,  or permit the use of any part of Premises  for cooking or
sleeping.
     5. Bring  into or keep in the  Building  any  inflammable,  combustible  or
explosive  material or do anything which will increase the danger of fire,  make
void or voidable any insurance on Building,  or result in any increased  premium
for such insurance; or permit any objectionable odors to emanate from Premises.
     6. Disturb or interfere  with the other  occupants of Building by any means
or in any way,
     7. Place  additional  locks or bolts on doors or windows or change existing
locks or bolts or the mechanism thereof.
     8. Move furniture,  equipment, or supplies into or out of Promises, without
the prior written consent of Lessor.
     9.  Advertise in any way which,  in Lessor's  opinion,  tends to impair the
reputation of Building or its desirability as an office building.

20. HOLDING OVER. Any holding over after the expiration of the term hereof shall
be  construed  as a tenancy  from month to month at a minimum  rental of one and
one-half  (1-1/2)  times the  monthly  minimum  rent for the  month  immediately
preceding  such  holdover,  and shall  otherwise be on the terms and  conditions
herein before specified.

21.  ENTRY BY LESSOR.  Lessor shall at any and all times have the right to enter
the Premises to inspect the same,  perform or supply any services to be provided
by Lessor,  and to submit said  Premises to  prospective  purchasers or tenants.
Lessor shall at all times have a key to the Premises.

22.  RECONSTRUCTION.  In the event the  Premises,  or the  Building of which the
Premises are a part,  are damaged by fire or other perils  Lessor shall have the
option;  (1) to repair or restore such  damage,  this Lease  continuing  in full
force and effect,  but the rent to be reduced in proportion to the damage to the
Premises,  or (2) give  notice to Lessee at any time within (60) days after such
damage  terminating  this Lease as of the date  specified in such notice,  which
date  shall be no less than  thirty  (30) and no more than sixty (60) days after
the giving of such notice.

23. DEFAULT.  The occurrence of any one of the following events shall constitute
a default and breach of this Lease by Lessee.

     23a. The vacating or abandonment of the Premises by Lessee.
     23b. The failure by Lessee to pay when due the rent or any other payment.
     23c. The failure by Lessee to observe or perform any of the covenants,
conditions or provisions of this Lease.
     23d. The making by Lessee of any general assignment or general  arrangement
for the benefit of creditors,  or the filing by or against  Lessee of a petition
to have Lessee adjudged bankrupt, or a petition for reorganization under any law
relating to bankruptcy.

24. REMEDIES IN DEFAULT. In the event of default by Lessee, Lessor may:
     24a. Enter the Premises,  with or without legal process,  and again possess
and enjoy the same as if this Lease had not been made,  and the entire amount of
unpaid rent due or  thereafter to become due hereunder  shall,  without  further
notice or other action on the part of Lessor,  accelerate and immediately become
due and payable.
     24b.  Terminate  Lessee's right to possession of the Premises by any lawful
means,  in which case this Lease shall  terminate  and Lessee shall  immediately
surrender  possession of the Promises to Lessor.
     24c. Maintain Lessee's right to possession,  in which case this Lease shall
continue in effect.

25. EMINENT  DOMAIN.  If any portion of the Building of which the Promises are a
part  shall be taken or  appropriated  by any public or  quasi-public  authority
under the power of eminent  domain,  Lessor shall have the right, at its option,
to  terminate  this Lease,  and Lessor  shall be entitled to any and all income,
rent or award of any kind which may be paid or made,  and  Lessee  shall have no
claim against Lessor for the value of any unexpired term of this lease.

26.  NOTICES.  All  notices to be given by either  party to the other  hereunder
shall be in writing.  Notices to the Lessee shall be sent by United States mail,
postage prepaid, addressed to the Lessee at the Premises, or to such other place
as Lessee may from time to time  designate.  Notices to the Lessor shall be sent
by United States mail,  postage  prepaid,  addressed to the Lessor at Pittsburgh
Properties,  Ltd., 33 N. Third Street, Suite 500, Columbus, OH 43215-3590, or to
such other person or place as the Lessor may from time to time designate.

27.  BROKERS.  Lessee  warrants that it has had no dealings with any real estate
broker or agents in connection  with the  negotiation of this Lease and it knows
of no other real  estate  broker or agent who is  entitled  to a  commission  in
connection with this Lease. The agent  representing the owner of the real estate
is exclusively representing the owner of the real estate.

<PAGE>

28.  WAIVER AS TO LOSS OR DAMAGE.  Lessor shall not be liable for the loss of or
damage to any property of Lessee or of others by theft or otherwise, nor for any
injury to Lessee, its employees, agents, or invitees.

29.  LESSOR'S  ALTERATIONS.  Provided this Lease is fully executed by August 30,
2001,  Lessor shall  promptly  schedule  the  following  alterations  as soon as
reasonably possible after this lease has been fully executed:

     o    Build the  doorway(s)and  install the door(s) as shown on the attached
          Exhibit B
     o    Replace damaged ceiling tile throughout suite.
     o    Clean entire suite.
     o    Replace  brass  colored  door  plates on two (2) doors as shown on the
          attached Exhibit B.
     o    Install  building  standard  mail  slot on the  door as  shown  on the
          attached Exhibit B.
     o    Make existing ceiling lights operable and replace lenses as needed.
     o    Replace any nonfunctioning light tubes and ballasts.

30.  TELECOMMUNICATIONS.  Lessee  shall,  during  the term of this Lease and any
Renewal thereafter,  satisfy its dial tone, long distance and broad band service
needs by contracting with North Pittsburgh  Systems,  Incorporated or one of its
subsidiaries,  as long as the  pricing of the above  services  provided by North
Pittsburgh Systems, Incorporated is equal to or less than that of Bell Atlantic.

31.  TRIAL BY JURY.  Lessor and Lessee  each  hereby  waives its right to a jury
trial of any issue or controversy arising under this Lease.

32. TERMINATION CLAUSE. If Lessee is in default of this Lease, Lessor shall have
the right to terminate this Lease by delivering a written thirty (30) day notice
to Lessee.

33. RIGHT OF FIRST REFUSAL. Lessor shall not enter into a Lease for either Suite
608 or 609 with any party other than Lessee without first offering said Suite to
Lessee.  In the event  that  Lessee  and  Lessor do not agree upon the terms and
conditions of a Lease  covering  either Suite 608 or 608,  within seven (7) days
after Lessor  offers said Suite to Lessee,  Lessor shall be free to lease either
Suits 608 or 609 to others.  Lessor  shall be free to lease  either Suite 608 or
609 to others  without  offering  said Suite to Lessee  anytime after August 31,
2006.

IN TESTIMONY WHEREOF,  the parties have executed duplicate  counterparts of this
Lease.

Signed and acknowledged                     LESSOR: PITTSBURGH PROPERTIES, LTD.
in the presence of:

----------------------                      BY:_______________________________
Witness

Signed and acknowledged                     LESSEE: XRG, INC.
in the presence of:
                                           BY:________________________________
----------------------
Witness

                          ADDENDUM TO LEASE AGREEMENT

     The  following  provision  is hereby  added to and made a part of the Lease
Agreement consummated between XRG, INC., Lessee and PITTSBURGH PROPERTIES, LTD.,
Lessor.

                            GUARANTY OF PERFORMANCE
                            -----------------------

INTENDING TO BE LEGALLY BOUND,  AND IN CONSIDERATION OF THE LEASE AGREEMENT WITH
LESSEE,  the undersigned,  jointly and severally,  hereby guarantee the faithful
performance  of all of the  terms,  covenants,  and  conditions  of this  Lease
Agreement by Lessee, and guarantee,  payment in full of all sums that may become
due and owing Lessor by Lessee.  This Guaranty shall remain in effect throughout
the term of this Lease and any  continuation  or renewal  thereof and so long as
Lessee may owe any sum to Lessor.  The  liability  of the  undersigned  shall be
continuing  absolute  and  unconditional  and Lessor  shall not be  required to
exercise  remedies  against Lessee before  proceeding  against the  undersigned.
Lessor shall notify the undersigned if Lessee shall breach this Lease Agreement.
The Lessor may not enforce the provisions of this Guaranty  unless and until the
default or breach shall not be cured within five (5) days after such notice.

     IN WITNESS  WHEREOF,  we have set our hands at Pittsburgh,  Pennsylvania on
the 28th day of August 2001.

                                           BY:________________________________
----------------------
Witness

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