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EXHIBIT 10.106

FOURTH AMENDED AND RESTATEDREVOLVING PROMISSORY NOTE

|           |  |                               
|---------- |  | ------------------------------
|$4,500,000 |  | McLean, Virginia
June 20, 2003

FOR VALUE RECEIVED, VERSAR, INC., a corporation organized under the laws
of the State of Delaware (Versar), GEOMET TECHNOLOGIES, LLC, a limited
liability company organized under the laws of the State of Maryland (formerly
known as Geomet Technologies, Inc.) (Geomet), VERSAR ENVIRONMENTAL COMPANY,
a corporation organized under the laws of the Commonwealth of Pennsylvania,
and VERSAR GLOBAL SOLUTIONS, INC., a corporation organized under the laws of
the Commonwealth of Virginia (the Borrowers, and each individually, a
Borrower), jointly and severally, promise to pay to the order of BANK OF
AMERICA, N.A., a national banking association, its successors and assigns (the
Lender), the principal sum of FOUR MILLION FIVE HUNDRED THOUSAND DOLLARS
($4,500,000) (the Principal Sum), or so much thereof as has been or may be
advanced or readvanced to or for the account of the Borrowers pursuant to the
terms and conditions of the Financing Agreement (as hereinafter defined),
together with interest thereon at the rate or rates hereinafter provided, in
accordance with the following:

1. Interest.Amounts outstanding under this Note shall bear interest from
the date hereof until repaid in full at the interest rate per year equal to the
Prim Rate plus two (2) percentage points. The Prime Rate is the rate of
interest publicly announced from time to time by the Lender as its Prime Rate.
The Prime Rate is set by the Lender based on various factors,

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including the Lenders costs and desired return, general economic
conditions and other factors, and is used as a reference point for pricing some
loans. The Lender may price loans to its customers at, above, or below the
Prime Rate. Any change in the Prime Rate shall take effect at the opening of
business on the day specified in the public announcement of a change in the
Lenders Prime Rate. The Prime Rate is not necessarily the lowest rate charged
by Lender on its loans and is set by Lender in its sole discretion. If the
Prime Rate becomes unavailable during the term of this loan, Lender may
designate a substitute rate after notifying Borrower. Lender will tell
Borrower the current Prime Rate upon Borrowers request.

2. Payments and Maturity. The unpaid Principal Sum, together with
interest thereon at the rate or rates provided above, shall be payable as
follows:

(a) Interest only on the unpaid Principal Sum shall be due and payable
monthly, commencing July 1, 2003, and on the first day of each month thereafter
to maturity; and

(b) Unless sooner paid, the unpaid Principal Sum, together with interest
accrued and unpaid thereon, shall be due and payable in full on September 30,
2003.

The fact that the balance hereunder may be reduced to zero from time to
time pursuant to the Financing Agreement will not affect the continuing
validity of this Note or the Financing Agreement, and the balance may be
increased to the Principal Sum after any such reduction to zero.

3.
Default Interest. Upon the occurrence of an Event of Default (as
hereinafter defined), the unpaid Principal Sum shall bear interest thereafter
at The Post-Default Rate.

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4. Late Charges.If the Borrowers shall fail to make any payment under
the terms of this Note within ten (10) days after the date such payment is due,
the Borrowers shall pay to the Lender on demand a late charge equal to five
percent (5%) of such payment.

5.
Application and Place of Payments. All payments, made on account of
this Note shall be applied first to the payment of any late charge then due
hereunder, second to the payment of accrued and unpaid interest then due
hereunder, and the remainder, if any, shall be applied to the unpaid Principal
Sum. All payments on account of this Note shall be paid in lawful money of the
United States of America in immediately available funds during regular business
hours of the Lender at its principal office in McLean, Virginia or at such
other times and places as the Lender may at any time and from time to time
designate in writing to the Borrowers. The Lender is authorized to deduct any
payment (including payments of principal and/or interest as above provided)
from the Borrowers Account Number 4113103748 on or after the date the payment
is due; provided, however, that such authorization shall not be deemed to
relieve the Borrowers from their joint and several obligation to make such
payment when it is due.

6.
Prepayment. The Borrowers may prepay the Principal Sum in whole or in
part without premium or penalty.

7.
Financing Agreement and Other Financing Documents. This Note is the
Revolving Credit Note described in that certain Amended and Restated
Financing and Security Agreement dated as of December 31, 2001 by and among the
Borrowers and the Lender (as thereafter amended, modified, restated,
substituted, extended and renewed at any time and from time to time, is
hereinafter called the Financing Agreement). The indebtedness evidenced by

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this Note is included within the meaning of the term Obligations as
defined in the Financing Agreement. This Note decreases, amends and restates in
its entirety that certain Third Amended and Restated Revolving Promissory Note
in the maximum principal amount of Five Million Dollars ($5,000,000) dated as
of May 14, 2003 (the Prior Note) jointly and severally from the Borrowers in
favor of the Lender. It is expressly understood and agreed that the
indebtedness evidenced by the Prior Note has not been extinguished or
discharged hereby. The Borrowers and the Lender agree that the execution of
this Note is not intended and shall not cause or result in a novation with
regard to the Prior Note. The term Financing Documents as used in this Note,
shall mean collectively this Note, each Acquisition Note, the Financing
Agreement and any other instrument, agreement, or document previously,
simultaneously, or hereafter executed and delivered by any of the Borrowers
and/or any other person, singularly or jointly with any other person,
evidencing, securing, guaranteeing, or in connection with the Principal Sum,
this Note and/or the Financing Agreement.

8.
Security. This Note is secured as provided in the Financing Agreement.

9.
Events of Default. The occurrence of any one or more of the following
events shall constitute an event of default (individually, an Event of
Default and collectively, the Events of Default) under the terms of this
Note:

(a) The failure of the Borrowers to pay to the Lender within five (5) days
of when due any and all amounts payable by the Borrowers to the Lender under
the terms of this Note; or

(b) The occurrence of an event of default (as defined therein) under the
terms and conditions of any of the other Financing Documents.

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10.Remedies. Upon the occurrence of an Event of Default, at the option
of the Lender, all amounts payable by the Borrowers to the Lender under the
terms of this Note shall immediately become due and payable by the Borrowers to
the Lender without notice to the Borrowers or any other person, and the Lender
shall have all of the rights, powers, and remedies available under the terms of
this Note, any of the other Financing Documents and all applicable laws. The
Borrowers and all endorsers, guarantors, and other parties who may now or in
the future be primarily or secondarily liable for the payment of the
indebtedness evidenced by this Note hereby severally waive presentment, protest
and demand, notice of protest, notice of demand and of dishonor and non-payment
of this Note and expressly agree that this Note or any payment hereunder may be
extended from time to time without in any way affecting the joint and several
liability of the Borrowers, guarantors and endorsers.

Until such time as the Lender is not committed to extend further credit to
the Borrowers and all Obligations of the Borrowers to the Lender have been
indefeasibly paid in full in cash, and subject to and not in limitation of the
provisions set forth in the next following paragraph below, no Borrower shall
have any right of subrogation (whether contractual, arising under the
Bankruptcy Code or otherwise), reimbursement or contribution from any Borrower,
or any guarantor nor any right of recourse to its security for any of the debts
and obligations of any Borrower which are the subject of this Note. Except as
otherwise expressly permitted by the Financing Agreement, any and all present
and future debts and obligations of any other to any Borrower are hereby
subordinated to the full payment and performance of all present and future
debts and obligations to the Lender under this Note and the Financing Agreement
and the Financing Documents, provided, however, notwithstanding anything set
forth in this Note to the

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contrary, prior to the occurrence of a payment Default, the Borrowers
shall be permitted to make payments on account of any of such present and
future debts and obligations from time to time in accordance with the terms
thereof.

The Borrowers further agree that, if any payment made by the Borrowers, or
any other person is applied to this Note and is at any time annulled, set
aside, rescinded, invalidated, declared to be fraudulent or preferential or
otherwise required to be refunded or repaid, or the proceeds of any property
hereafter securing this Note is required to be returned by the Lender to any
Borrower, their estate, trustee, receiver or any other party, including,
without limitation, such Borrower, under any bankruptcy law, state or federal
law, common law or equitable cause, then, to the extent of such payment or
repayment, such Borrowers liability hereunder (and any lien, security interest
or other collateral securing such liability) shall be and remain in full force
and effect, as fully as if such payment had never been made, or, if prior
thereto any such lien, security interest or other collateral hereafter securing
such the Borrowers liability hereunder shall have been released or terminated
by virtue of such cancellation or surrender, this Note (and such lien, security
interest or other collateral) shall be reinstated in full force and effect, and
such prior cancellation or surrender shall not diminish, release, discharge,
impair or otherwise affect the obligations of such Borrower of the amount of
such payment (or any lien, security interest or other collateral securing such
obligation).

The JOINT AND SEVERAL obligations of each Borrower under this Note shall
be absolute, irrevocable and unconditional and shall remain in full force and
effect until the outstanding principal of and interest on this Note and all
other Obligations or amounts due hereunder and under the Financing Agreement
and the Financing Documents shall have been

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indefeasibly paid in full in cash in accordance with the terms thereof and
this Note shall have been canceled.

11.     Expenses. The Borrowers jointly and severally promise to pay to the
Lender on demand by the Lender all costs and expenses incurred by the Lender in
connection with the collection and enforcement of this Note, including, without
limitation, reasonable attorneys fees and expenses and all court costs.

12.     Notices. Any notice, request, or demand to or upon the Borrowers or
the Lender shall be deemed to have been properly given or made when delivered
in accordance with Section 11.01 of the Financing Agreement.

13.     Miscellaneous. Each right, power, and remedy of the Lender as
provided for in this Note or any of the other Financing Documents, or now or
hereafter existing under any applicable law or otherwise shall be cumulative
and concurrent and shall be in addition to every other right, power, or remedy
provided for in this Note or any of the other Financing Documents or now or
hereafter existing under any applicable law, and the exercise or beginning of
the exercise by the Lender of any one or more of such rights, powers, or
remedies shall not preclude the simultaneous or later exercise by the Lender of
any or all such other rights, powers, or remedies. No failure or delay by the
Lender to insist upon the strict performance of any term, condition, covenant,
or agreement of this Note or any of the other Financing Documents, or to
exercise any right, power, or remedy consequent upon a breach thereof, shall
constitute a waiver of any such term, condition, covenant, or agreement or of
any such breach, or preclude the Lender from exercising any such right, power,
or remedy at a later time or times. By accepting payment after the due date of
any amount payable under the terms of this Note, the Lender shall

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not be deemed to waive the right either to require prompt payment when due
of all other amounts payable under the terms of this Note or to declare an
Event of Default for the failure to effect such prompt payment of any such
other amount. No course of dealing or conduct shall be effective to amend,
modify, waive, release, or change any provisions of this Note.

14.     Partial Invalidity. In the event any provision of this Note (or any
part of any provision) is held by a court of competent jurisdiction to be
invalid, illegal, or unenforceable in any respect, such invalidity, illegality,
or unenforceability shall not affect any other provision (or remaining part of
the affected provision) of this Note; but this Note shall be construed as if
such invalid, illegal, or unenforceable provision (or part thereof) had not
been contained in this Note, but only to the extent it is invalid, illegal, or
unenforceable.

15.     Captions. The captions herein set forth are for convenience only and
shall not be deemed to define, limit, or describe the scope or intent of this
Note.

16.     Applicable Law. Each Borrower acknowledges and agrees that this
Note shall be governed by the laws of the Commonwealth of Virginia, even though
for the convenience and at the request of the Borrowers, this Note may be
executed elsewhere.

17.     WAIVER OF TRIAL BY JURY. EACH BORROWER HEREBY WAIVES TRIAL BY JURY IN
ANY ACTION OR PROCEEDING TO WHICH EITHER BORROWER AND THE LENDER MAY BE
PARTIES, ARISING OUT OF OR IN ANY WAY PERTAINING TO (A) THIS NOTE OR (B) THE
FINANCING DOCUMENTS. IT IS AGREED AND UNDERSTOOD THAT THIS WAIVER CONSTITUTES
A WAIVER OF TRIAL BY JURY OF ALL CLAIMS AGAINST ALL PARTIES TO SUCH ACTIONS

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OR PROCEEDINGS, INCLUDING CLAIMS AGAINST PARTIES WHO ARE NOT PARTIES TO
THIS NOTE.

THIS WAIVER IS KNOWINGLY, WILLINGLY AND VOLUNTARILY MADE BY EACH BORROWER,
AND EACH BORROWER HEREBY REPRESENTS THAT NO REPRESENTATIONS OF FACT OR OPINION
HAVE BEEN MADE BY ANY INDIVIDUAL TO INDUCE THIS WAIVER OF TRIAL BY JURY OR TO
IN ANY WAY MODIFY OR NULLIFY ITS EFFECT. EACH BORROWER FURTHER REPRESENTS THAT
IT HAS BEEN REPRESENTED IN THE SIGNING OF THIS NOTE AND IN THE MAKING OF THIS
WAIVER BY INDEPENDENT LEGAL COUNSEL, SELECTED OF ITS OWN FREE WILL, AND THAT IT
HAS HAD THE OPPORTUNITY TO DISCUSS THIS WAIVER WITH COUNSEL.

18.     ARBITRATION. ANY CONTROVERSY OR CLAIM BETWEEN OR AMONG THE PARTIES
HERETO INCLUDING BUT NOT LIMITED TO THOSE ARISING OUT OF THIS NOTE OR ANY
RELATED INSTRUMENTS, AGREEMENTS OR DOCUMENTS, INCLUDING ANY CLAIM BASED ON OR
ARISING FROM AN ALLEGED TORT, SHALL BE DETERMINED BY BINDING ARBITRATION IN
ACCORDANCE WITH THE FEDERAL ARBITRATION ACT (OR IF NOT APPLICABLE, THE
APPLICABLE STATE LAW), THE RULES OF PRACTICE AND PROCEDURE FOR ARBITRATION OF
COMMERCIAL DISPUTES OF ENDISPUTE, INC., D/B/A J.A.M.S./ENDISPUTE (J.A.M.S.)
AND THE SPECIAL RULES SET FORTH BELOW. IN THE EVENT OF AN INCONSISTENCY, THE
SPECIAL RULES SHALL CONTROL. JUDGMENT UPON ANY ARBITRATION AWARD MAY BE
ENTERED IN ANY COURT HAVING JURISDICTION.

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ANY PARTY TO THIS INSTRUMENT, AGREEMENT OR DOCUMENT MAY BRING ANY ACTION,
INCLUDING A SUMMARY OR EXPEDITED PROCEEDING, TO COMPEL ARBITRATION OF ANY
CONTROVERSY OR CLAIM TO WHICH THIS NOTE RELATES IN ANY COURT HAVING
JURISDICTION OVER SUCH ACTION.

(A)  SPECIAL RULES. THE ARBITRATION SHALL BE CONDUCTED IN FAIRFAX COUNTY,
VIRGINIA AND ADMINISTERED BY J.A.M.S. WHO WILL APPOINT AN ARBITRATOR. IF
J.A.M.S. IS UNABLE OR LEGALLY PRECLUDED FROM ADMINISTERING THE ARBITRATION,
THEN THE AMERICAN ARBITRATION ASSOCIATION WILL SERVE. ALL ARBITRATION HEARINGS
WILL BE COMMENCED WITHIN NINETY (90) DAYS OF THE DEMAND FOR ARBITRATION;
FURTHER, THE ARBITRATOR SHALL ONLY, UPON A SHOWING OF CAUSE, BE PERMITTED TO
EXTEND THE COMMENCING OF SUCH HEARING FOR AN ADDITIONAL SIXTY (60) DAYS.

(B)  RESERVATION OF RIGHTS. NOTHING IN THIS NOTE SHALL BE
DEEMED TO: (I) LIMIT THE APPLICABILITY OF ANY OTHERWISE APPLICABLE STATUTES OF
LIMITATION OR REPOSE AND ANY WAIVERS CONTAINED IN THIS INSTRUMENT, AGREEMENT OR
DOCUMENT; OR (II) BE A WAIVER BY THE LENDER OF THE PROTECTION AFFORDED TO IT BY
12 U.S.C. §91 OR ANY SUBSTANTIALLY EQUIVALENT STATE LAW; OR (III) LIMIT THE
RIGHT OF THE LENDER: (A) TO EXERCISE SELF HELP REMEDIES SUCH AS (BUT NOT
LIMITED TO) SET OFF, OR (B) TO FORECLOSE AGAINST ANY REAL OR PERSONAL PROPERTY
COLLATERAL, OR

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(C)  TO OBTAIN FROM A COURT PROVISIONAL OR ANCILLARY REMEDIES SUCH AS (BUT
NOT LIMITED TO) INJUNCTIVE RELIEF, WRIT OF POSSESSION OR THE APPOINTMENT OF A
RECEIVER. THE LENDER MAY EXERCISE SUCH SELF HELP RIGHTS, FORECLOSE UPON SUCH
PROPERTY, OR OBTAIN SUCH PROVISIONAL OR ANCILLARY REMEDIES BEFORE, DURING OR
AFTER THE PENDENCY OF ANY ARBITRATION PROCEEDING BROUGHT PURSUANT TO THIS
INSTRUMENT, AGREEMENT OR DOCUMENT. NEITHER THE EXERCISE OF SELF HELP REMEDIES
NOR THE INSTITUTION OR MAINTENANCE OF ANY ACTION FOR FORECLOSURE OR FOR
PROVISIONAL OR ANCILLARY REMEDIES SHALL CONSTITUTE A WAIVER OF THE RIGHT OF ANY
PARTY, INCLUDING THE CLAIMANT IN SUCH ACTION, TO ARBITRATE THE MERITS OF THE
CONTROVERSY OR CLAIM OCCASIONING RESORT TO SUCH REMEDIES.

[SIGNATURES BEGIN ON THE FOLLOWING PAGE]

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IN WITNESS WHEREOF, the Borrowers have caused this Note to be executed
under seal by their duly authorized officers as of the date first written
above.

|                |  |                               |  |                             |  |       
|--------------- |  | ----------------------------- |  | --------------------------- |  | ------
|WITNESS/ATTEST: |  | VERSAR, INC.                  |  |                            
|                |  |                               |  |                             |  |       
|/S/ May Tom     |  | By:                           |  | /S/ Lawrence W. Sinnott     |  | (SEAL)
|                |  |                               |  |                             |  |       
|                |  |                               |  | Name: Lawrence W. Sinnott   |  |       
|                |  |                               |  | Title: Sr. Vice Pres. & CFO |  |       
|                |  |                               |  |                             |  |       
|WITNESS/ATTEST: |  | GEOMET TECHNOLOGIES, LLC      |  |                            
|                |  |                               |  |                             |  |       
|/S/ May Tom     |  | By:                           |  | /S/ Lawrence W. Sinnott     |  | (SEAL)
|                |  |                               |  |                             |  |       
|                |  |                               |  | Name: Lawrence W. Sinnott   |  |       
|                |  |                               |  | Title: Vice President       |  |       
|                |  |                               |  |                             |  |       
|WITNESS/ATTEST: |  | VERSAR ENVIRONMENTAL COMPANY  |  |                            
|                |  |                               |  |                             |  |       
|/S/ May Tom     |  | By:                           |  | /S/ Lawrence W. Sinnott     |  | (SEAL)
|                |  |                               |  |                             |  |       
|                |  |                               |  | Name: Lawrence W. Sinnott   |  |       
|                |  |                               |  | Title: Vice President       |  |       
|                |  |                               |  |                             |  |       
|WITNESS/ATTEST: |  | VERSAR GLOBAL SOLUTIONS, INC. |  |                            
|                |  |                               |  |                             |  |       
|/S/ May Tom     |  | By:                           |  | /S/ Lawrence W. Sinnott     |  | (SEAL)
|                |  |                               |  |                             |  |       
|                |  |                               |  | Name: Lawrence W. Sinnott   |  |       
|                |  |                               |  | Title: Vice President       |  |       

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