Document:

EXHIBIT 4.1

                         PNC BANK, NATIONAL ASSOCIATION
                        201 South Tryon Street, Suite 900
                               Charlotte, NC 28202

                                                                     May 1, 2006

Perma-Fix Environmental Services, Inc.
1940 N.W. 67th Place
Gainesville, Florida  32653

Attn: Dr. Louis F. Centofanti, President

Dear Dr. Centofanti:

         Reference is made to the Revolving Credit, Term Loan and Security
Agreement dated as of December 22, 2000 (as amended, modified, restated or
supplemented from time to time, the "Loan Agreement") among Perma-Fix
Environmental Services, Inc. ("Borrower"), PNC Bank, National Association
("PNC"), the various financial institutions which are now or which hereafter
become a party thereto (together with PNC, each a "Lender" and collectively, the
"Lenders") and PNC as issuing bank and agent for itself and Lenders (in such
capacity, "Agent"). All capitalized terms used herein which are not otherwise
defined herein shall have the meanings set forth in the Loan Agreement.

         An Event of Default has occurred under Section 10.13 of the Loan
Agreement as a result of the resignation of Richard Kelecy as Vice President and
Chief Financial Officer of the Borrower (the "Resignation"). You have requested
that we waive such Event of Default. We hereby waive the Event of Default which
has occurred under Section 10.13 of the Loan Agreement as a result of the Change
of Control arising due to the Resignation.

         Except as expressly provided herein, the execution, delivery and
effectiveness of this letter shall not operate as a waiver of any of our rights,
powers or remedies, nor constitute a waiver of any provision of the Loan
Agreement, or any other documents, instruments or agreements executed and/or
delivered thereunder or in connection therewith and all other documents,
instruments and agreements executed and/or delivered in connection therewith,
shall remain in full force and effect.

                                                 Very truly yours,

                                                 PNC BANK, NATIONAL ASSOCIATION,
                                                  as Agent

                                                 By: /s/ Alex M. Council, IV
                                                     ---------------------------
                                                     Alex M. Council
                                                     Vice PresidentEXHIBIT 10.1
                                      LEASE

         THIS LEASE made and entered into this 15th day of February, 2006, by
and between Lawrence Properties, LLC, hereinafter called Landlord, and Perma-Fix
Environmental Services Inc. hereinafter called Tenant.

         WITNESSETH:

Premises 1.         Landlord, for and in consideration of the rents, covenants
                    and agreements hereinafter mentioned and hereby agreed to be
                    paid, kept and performed by Tenant, does hereby lease with
                    covenant for quiet enjoyment to Tenant, and Tenant, hereby
                    hires from the Landlord, the following described premises
                    (hereinafter called the "leased premises"), located in the
                    City of Ellisville, in the County of St. Louis, State of
                    Missouri, and more particularly described as follows:

                    10,500 sq. ft. of office/ warehouse space known and numbered
                    as 16252 Westwood Business Park Drive, Ellisville Missouri

Use of Premises 2.  The leased premises may be used and occupied by Tenant
                    during the term hereof, subject to the conditions herein
                    contained, for general office, warehousing or light
                    manufacturing purposes. In no event shall the premises be
                    used for any purpose contrary to law, zoning regulations, or
                    recorded restrictions, if any.

Improvements to     Tenant shall immediately provide to Landlord preliminary
Property 3.         plans for additional leasehold improvements required in the
                    space. Landlord agrees that after execution of this lease,
                    Landlord shall at its expense prepare and submit to Tenant,
                    plans and specifications for final improvements. Landlords
                    cost for said improvements shall not exceed One Hundred
                    Thousand Dollars ($100,000.00) Tenant agrees that approval
                    for such final plans and specifications will be acted upon
                    in 10 days from the date they are received from Landlord.
                    Approval by Tenant shall not be unreasonably withheld. If
                    such final plans and specifications are not approved by
                    Tenant within such time period, then Landlord may, at its
                    election, terminate this lease. When finally approved and
                    initialed by both parties, such final plans and
                    specifications shall be attached hereto and shall become a
                    part of this lease as if originally incorporated herein.
                    Landlord shall provide for a minimum of 1600 cubic feet of
                    mutually agreeable weather resistant, secure equipment
                    storage space on the property for the term of the lease.
                    Tenant shall have the right to use said storage space
                    exclusively for the duration of the lease Tenant's entry
                    into possession of the leased premises shall be deemed its
                    acceptance of the premises in good order, condition and
                    repair.

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Term 4.             The term of this lease shall be for five (5) years,
                    commencing on the Ist day of June, 2006, and ending on the
                    31st day of May, 2011, both dates inclusive. If the leased
                    premises are not available or ready for occupancy at such
                    commencement date, and such unavailability or unreadiness is
                    not occasioned or caused by Tenant, (such as Tenant's
                    failure promptly to approve plans, make material or color
                    selections, make improvements to the leased premises which
                    are to be made by Tenant or make other decisions necessary
                    to the preparation of the leased premises for occupancy),
                    then the commencement date shall be the first day of the
                    month succeeding the month in which the lease premises are
                    available and ready for occupancy, as evidenced by written
                    notice given by Landlord to Tenant, and the termination date
                    should be extended accordingly. After the commencement and
                    termination dates have been determined as aforesaid, and
                    upon the demand of either the Landlord or the Tenant, the
                    parties hereto will execute a written declaration expressing
                    the specific commencement and termination dates. If by
                    mutual consent of the parties Tenant takes possession of the
                    leased premises prior to the commencement date, then during
                    such pre-term occupancy shall not affect the lease term as
                    herein otherwise established. If by mutual consent of
                    parties Tenant shall remain in possession of the leased
                    premises after the expiration of the term of this lease,
                    such possession shall be as a month to month tenancy during
                    which time the rent shall be payable at the same rate as
                    that in effect during the last month of the term, and the
                    provisions of this lease shall be applicable.

Rent 5.             Tenant shall without deduction, abatement or set-off of any
                    nature whatsoever, pay to Landlord as fixed rent for the
                    lease premises the sum of One Hundred Twenty, One Thousand
                    Two Hundred Seventy Five and 00/100 Dollars ($121,275.00)
                    per annum, payable in monthly installments of Ten Thousand,
                    One Hundred and Six and 25/100 Dollars ($10,106.25) each, in
                    advance without demand, on the first day of each and every
                    month during the term of this lease. Rent may be paid up to
                    the 15th of the month without any penalties.

                           Upon execution of this Lease by both parties, and
                    prior to Tenants occupancy, Tenant shall deposit with
                    Landlord on demand the first month's rent of $10,106.25 and
                    a security deposit of $5000.00. Upon termination of this
                    lease, the security deposit shall be returned to the Tenant
                    if the leased premises are turned over to Landlord in the
                    same condition as at the commencement of this lease,
                    ordinary wear and tear excepted and no adjustment payments
                    are due. If any repairs are required due to Tenants abuse or
                    neglect, Tenant shall be responsible for the cost of the
                    repairs or replacement. Landlord shall use the security
                    deposit for full or partial payment of any repair or
                    replacement costs which are a result of Tenant's abuse or
                    neglect and charge the Tenant for any cost over and above
                    the amount of the security deposit. If costs and adjustments
                    chargeable against the security deposit are less than the
                    amount of the security deposit, the portion of the security
                    deposit in excess of such charges shall be returned to
                    Tenant.

Taxes 6.            The Tenant shall pay to the Landlord, as additional rent,
                    the proportionate part of any increases in real estate taxes
                    or assessments, or service charges levied or assessed, or
                    the fire and extended coverage insurance premium on the land
                    and building of which the leased premises are a part over
                    and above the amount thereof assessed for the calendar year
                    during which the term of this lease commences. Such
                    additional rent shall be payable by Tenant upon presentation
                    to Tenant of copies of paid statements for the

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                    year for which payment is demanded and copies of the paid
                    statement for the base year as above determined. The
                    proportion of such increase payable by Tenant shall be based
                    on the ratio which the number of square feet of gross area
                    occupied by the Tenant in the building bears to the total
                    number of square feet of gross area in the entire building.

                           The Tenant shall also pay to the Landlord, as
                    additional rent, the proportionate part of any increase in
                    costs of the Casualty and Comprehensive Liability Insurance
                    which are over and above the amount thereof incurred for the
                    calendar year during which the term of this lease commences.

Assignment and      Tenant shall not assign this lease nor sublet all or any
 Subleting 7.       part of the leased premises without the prior written
                    consent of Landlord, which consent shall not be unreasonably
                    withheld. Landlord's consent to one assignment or subletting
                    shall not be deemed a consent to any other or further
                    assignment thereunder and no acceptance by Landlord of any
                    rent or any other sum of money from any assignee or
                    sublessee shall release Tenant from any of its obligations
                    under this lease: and in any event Tenant shall remain
                    primarily liable on this lease for the entire term hereof
                    and shall in no wise be released from the full and complete
                    performance of all terms and conditions, covenants and
                    agreements herein contained.

                           In the event that Tenant shall sublet the leased
                    premises for a rental in excess of fixed rent due hereunder
                    from Tenant to Landlord, then notwithstanding any other
                    provision contained In this Lease to the contrary, the fixed
                    rent provided for in paragraph 5 of this Lease shall
                    automatically be increased during the term of such sub-lease
                    to a sum equal to the amount of rent payable under such
                    sub-lease. In the event that Tenant shall receive any
                    valuable consideration for an assignment of the Tenant's
                    interest in this lease, then, notwithstanding any other
                    provision contained in this lease to the contrary, Tenant
                    shall pay to Landlord as additional rent hereunder the
                    amount for consideration thereby received.

Parking  8.         Tenant shall during the lease term have the right to use
                    parking spaces on the parking lot adjacent to the leased
                    premises, for itself, its employees and its invitees on a
                    non-exclusive and unassigned basis.

Repairs and         Landlord shall at its cost keep in good repair the
 Maintenance 9.     foundation, exterior walls, roofs, gutters and downspouts
                    forming a part of the leased premises. Any repairs to any
                    such portions of the leased premises or other areas made
                    necessary by the negligence of Tenant its officers, agents,
                    employees, or invitees, shall be made by Tenant at Tenants
                    cost.

                           Landlord shall provide for maintenance and repair of
                    the mechanical systems, common area lighting, landscaped
                    areas, parking lot and drives, including snow removal, clean
                    up and exterior trash removal. This shall include
                    maintaining the lawn and shrubbery adjacent to the lease
                    premises, including watering, cutting the grass and
                    replacing of any dead trees, bushes or other ornamental
                    plantings.

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                           Tenant shall, at its own cost and expense, keep all
                    other parts of the leased premises in good repair
                    (including, but not limited to the plumbing system,
                    electrical system, sprinkler system, exterior doors and
                    interior doors and partitions) and shall keep the leased
                    premises and area adjacent thereto in good order to the
                    standards of a first class office and warehousing building,
                    including, but in no way, limited to:

                           (a)      Keeping and maintaining the sidewalks,
                    common areas, parking lot and drives adjoining the leased
                    premises in a clean condition, including sweeping and the
                    removal of trash there from.

                           (b)      Maintaining  and keeping in  existence at
                    all times dock bumpers if applicable in good condition, so
                    as to protect the leased premises.

                           (c)      Maintaining and replacing all glass, plate
                    glass, and skylights in the leased premises.

                           (d)      Throughout the term of this lease, and any
                    options, Tenant shall carry a full service HVAC maintenance
                    contract. Said service contract, as paid by the tenant,
                    shall not exceed $6,350 per year, subject to inflationary
                    increases as described in this document.

                           In the event that Tenant shall be in default under
                    this Paragraph 9, the Landlord may cure such default on
                    behalf of the Tenant, in which event, Tenant on demand,
                    shall reimburse Landlord for all sums paid to effect such
                    cure, plus 33-1/3% thereof, to cover Landlord's overhead
                    expenses and plus reasonable attorney's fees. In order to
                    collect such reimbursement the Landlord shall have all the
                    remedies available under this lease for a default in the
                    payment of rent.

Alterations 10.     No alteration, addition or improvement to the leased
                    premises shall be made by the Tenant without the written
                    consent of the Landlord. Any alteration, addition or
                    improvement made by the Tenant after such consent shall have
                    been given, and any fixtures installed as part thereof,
                    shall at Landlord's option, become the property of Landlord
                    upon the expiration or sooner termination of this lease:
                    provided, however, that the Landlord shall have the right to
                    require the Tenant to remove such fixtures at the Tenants
                    cost upon such termination of this lease.

Waste 11.           The Tenant covenants not to do or suffer any waste to the
                    leased premises.

Mechanic's          Tenant shall not permit mechanic's lien to be filed against
 Liens 12.          the fee of the leased premises which were a result of work
                    commissioned by Tenant, or against the Tenants leasehold
                    interest in the premises by reason of work, labor, services
                    or materials supplied or claimed to have been supplied to
                    the Tenant or anyone holding the leased premises through or
                    under the Tenant, whether prior or subsequent to the
                    commencement of the term thereof. If any mechanic's lien
                    shall at any time be filed against the leased premises and
                    Tenant shall fail to remove same within thirty (30) days
                    thereafter, it shall constitute a default under the
                    provisions of this lease.

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Restrictions on     The Tenant shall not allow, permit or suffer any noise,
Use 13.             smoke or odor to escape from the leased premises in a manner
                    which will disturb other occupants of the building, or
                    occupy the leased premises in such manner as to disturb the
                    peaceful and quiet occupancy of the other tenants of the
                    building or constitutes public or private nuisance. No sign,
                    fixture, advertisement or notice shall be displayed,
                    inscribed, painted or affixed by Tenant on any part of the
                    outside of the leased premises or on the parking lot or on
                    any part of the Landlord's property, adjacent to the leased
                    premises without the prior written consent of the Landlord.
                    At the expiration of the lease term, Tenant shall remove all
                    such signs or advertisement matter at its cost and shall
                    repair any damage resulting from such removal. Nor shall
                    Tenant allow or permit any goods, materials, or equipment to
                    be stored outside of the buildings without the prior written
                    consent of the Landlord.

Utilities 14.       Tenant shall pay for all gas, electricity, common area
                    lighting, water, heat air conditioning, sewer and telephone
                    service and all other utilities used in and upon the leased
                    premises. The costs of any utilities that cannot be metered
                    separately will be allocated to Tenant on a pro-rata basis.

Access 15.          Landlord, and its duly authorized agents, employees and
                    contractors, shall have access to the leased premises at all
                    reasonable times for the purpose of inspecting the same and
                    making necessary repairs or replacements as called for
                    hereunder.

Insurance 16.       If Landlord's cost of insurance for the leased premises
                    shall be increased by reason of the occupancy and use of the
                    premises by Tenant or any other person holding under the
                    Tenant, all such increases over the existing rate prior to
                    such use shall be paid by Tenant to Landlord, on demand.

Liability           Tenant agrees to maintain at its expense at all times during
Insurance 17.       the lease term full public liability and contractual
                    liability insurance properly protecting and indemnifying
                    Landlord and naming Landlord as additional insured in an
                    amount not less than $1,000,000. per person and $1,000,000.
                    per accident for Injuries or damages to persons, and not
                    less than $1,000,000. damage or destruction of property,
                    written by insurers licensed to do business in the State of
                    Missouri. Tenant shall deliver to Landlord certificates of
                    such insurance, which shall declare that the respective
                    insurer may not cancel the same in whole or in part without
                    giving Landlord written notice of its intention to do so at
                    least ten (10) days in advance.

                           Prior to the commencement of this lease, Landlord
                    shall provide Tenant with proof of property and casualty
                    insurance on the property. Should Landlord cancel said
                    insurance during the term of this lease, Landlord shall give
                    tenant 30 days prior written notice.

Liability 18.       Landlord shall not be liable for any failure of water
                    supply, gas or electric current: not for any injury or
                    damage to person or property caused by gasoline, oil, steam,
                    gas, electricity, hurricane, tornado, earthquake, flood,
                    wind or similar storms and disturbances: nor water, rain or
                    snow which may leak or flow from the street, sewer, gas
                    mains or any subsurface area from any part of the building
                    or improvements on the

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                    leased premises: nor for any personal injury to Tenant, its
                    officers, agents, employees and invitees, nor any other
                    occupant of any part of the leased premises, nor for any
                    damages to any property of the Tenant or of any other
                    occupant of any part of the leased premises, Irrespective of
                    how much such injury or damage may be caused, whether from
                    action of the elements or acts by occupants of adjacent
                    properties, but this section does not apply to any acts of
                    negligence of Landlord.

                    Tenant shall indemnify and hold Landlord harmless from any
                    loss, damages and expenses incident thereto arising out of
                    liability to any person on account of loss of or damage to
                    property or injury to persons resulting from the use and
                    occupancy of the leased premises or the parking lot,
                    sidewalks, drives, or common area by Tenant.

Limitation of       Anything contained in this Lease to the contrary
Liability 19.       notwithstanding, Tenant agrees that Tenant shall look solely
                    to the estate and property of Landlord in the land and
                    Buildings of which the Leased Premises forms a part, in the
                    event of any default or breach by Landlord with respect to
                    any of the terms and provisions of this Lease.

Damage or           The destruction of the building and improvements on the
Destruction 20.     leased premises by fire or other casualty or such material
                    Injury thereto so as to render the premises In question
                    untenable for one hundred twenty (120) days shall produce
                    and work a termination of this lease. Provided, however,
                    that if such destruction of or damage to the premises shall
                    be due to the act or negligence of Tenant, its officers,
                    agents, or employees, the Landlord shall have the option to
                    produce and work a termination of this lease or to restore
                    the premises to substantially the same condition in which
                    they existed prior to such destruction or damage.

                           If the Landlord and Tenant cannot agree as to whether
                    said building and improvements are unquestionably untenable
                    for one hundred twenty (120) days, the fact shall be
                    determined by arbitration; the Landlord and Tenant shall
                    each choose an arbitrator within five (5) days after either
                    has notified the other in writing of such damage. The two
                    arbitrators so chosen, before entering on the discharge of
                    their duties, shall elect a third, and the decision of any
                    two of such arbitrators shall be conclusive and binding upon
                    both parties hereto. If it is determined by arbitration, or
                    agreement between the Landlord and Tenant, that said
                    premises are not unquestionably untenable for one hundred
                    twenty (120) days, then Landlord shall restore said premises
                    to substantially the same condition in which they existed
                    prior to such damage, at Landlord's own expense, with all
                    reasonable speed and promptness, and in such case a just and
                    proportionate part of said rental shall be abated until said
                    premises have been restored. In determining what constitutes
                    reasonable speed and promptness, considerations shall be
                    given to delays caused by strikes, adjustment of insurance,
                    and other causes beyond the Landlord's control.

                           In no event shall the Landlord be required to restore
                    any alteration, additions or Improvements made by or for the
                    Tenant and not required by this Lease to be furnished by
                    Landlord, nor any trade fixtures, furniture, equipment or
                    other property belonging to Tenant.

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Condemnation 21.           (a)      If the whole of the leased premises shall be
                    taken for any public or any quasi-public use under any
                    statute or by right of eminent domain, or by purchase under
                    threat of condemnation, then this lease shall automatically
                    terminate as of the date that title shall be taken. If any
                    part of the leased premises shall be so taken as to render
                    the remainder thereof unusable for the purposes for which
                    the leased premises were leased, then the Landlord and
                    Tenant shall each have the right to terminate this lease on
                    thirty (30) days notice to the other given within ninety
                    (90) days after the date of such taking. In the event that
                    this lease shall terminate or be terminated, the rental,
                    shall, be adjusted to cease on the date of such termination.

                           (b)      If any part of the leased premises shall be
                    so taken and this lease shall not terminate or be terminated
                    under the provisions of subparagraph (a) above, then the
                    rental shall be equitably apportioned according to the space
                    so taken, and the Landlord shall, at its own cost and
                    expense, restore the remaining portion of the leased
                    premises to the extent necessary to render them reasonably
                    suitable for the purposes for which they were leased, and
                    shall make all repairs to the building in which the leased
                    premises are located to the extent necessary to constitute
                    the building a complete architectural unit.

                           (c)      All compensation awarded or paid upon such a
                    total or partial taking of the leased premises shall belong
                    to and be the property of the Landlord without any
                    participation by the Tenant: provided, however, that nothing
                    contained herein shall be construed to preclude the Tenant
                    from prosecuting any claim directly against the condemning
                    authority in such condemnation proceeding for loss of
                    business, depreciation to, damage to, or cost of removal of,
                    or for the value of stock, trade fixtures, furniture, and
                    other personal property belonging to the Tenant provided,
                    however, that no such claim shall diminish or otherwise
                    adversely affect the Landlord's award.

Default 22.         The following events shall be deemed to be events of default
                    by Tenant under this lease: (i) if Tenant shall fail to pay
                    any fixed or additional rent hereby reserved when due (ii)
                    if Tenant shall fail to comply with any term or provision,
                    or covenant of this lease, other than the payment of rent
                    (iii) if Tenant shall become insolvent, or shall make a
                    transfer In fraud of its creditors, or shall make an
                    assignment for the benefit of its creditors (iv) if Tenant
                    shall file a petition under any section or chapter of the
                    National Bankruptcy Act, as amended, or under any similar
                    law or statute of the United States or any state thereof, or
                    Tenant shall be adjudicated bankrupt or Insolvent in
                    proceedings filed against Tenant thereunder (v) if a
                    receiver or trustee shall be appointed for substantially all
                    of the assets of Tenant, or (vi) if Tenant shall desert or
                    vacate any substantial portion of the leased premises. In
                    all cases above Tenant shall have ten (10) days to cure such
                    failure or default following written notice from Landlord.

                           Upon the occurrence of any such event of default,
                    Landlord shall have the option to pursue any one or more of
                    the following remedies (as well as any other remedies
                    provided by Law) without any notice or demand whatsoever.

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                    (a)    Terminate Tenants right to possession of the leased
                           premises (without terminating this lease or Tenants
                           obligations hereunder) and enter upon and take
                           possession of the leased premises by summary
                           proceedings, force or in any other manner, and
                           dispossess, expel, and remove the Tenant or any other
                           person who may be occupying the leased premises or
                           any part thereof (including changing or altering the
                           locks or other security devices) and remove and expel
                           any personal property of trade fixtures located
                           therein, all without being liable to any prosecution
                           therefore or for any damages resulting therefore. In
                           such event Landlord shall also have the option to
                           declare immediately due and payable and to
                           immediately recover from the Tenant the entire amount
                           of rent then remaining to be paid under this lease
                           for the balance of the lease term. In the event of
                           such re-entry by Landlord, Landlord shall also have
                           the option to allow the leased premises to remain
                           vacant or relet same for the account of Tenant (in
                           the name of Landlord or in the name of Tenant) at any
                           rent and for any term readily obtainable and receive
                           the rent therefore, in which event all rents that may
                           arise by reason of such relettlng (after first
                           deducting all repossession costs, brokerage
                           commission, legal expenses, attorney's fees and all
                           other expenses in cleaning, altering premises for
                           reletting) shall be paid over to Tenant or credited
                           to Tenant's account.

                    (b)    Forfeit and terminate this lease and Tenant's right
                           to possession of the leased premises. In the event of
                           such termination Tenant shall immediately surrender
                           the leased premises to Landlord and if Tenant fails
                           to do so, Landlord may enter upon and take possession
                           of the leased premises and expel or remove tenant and
                           any other person who may be occupying said premises
                           or any part thereof, and any personal property or
                           trade fixtures located therein. In the event of a
                           forfeiture of the lease as herein provided, Tenant
                           agrees that the security deposit being held by
                           Landlord hereunder shall be forfeited to Landlord as
                           liquidated damages for Tenant's default, which
                           liquidated damages shall be in addition to and not in
                           lieu of any unpaid rent or any other damages accruing
                           to Landlord by reason of the violation by Tenant of
                           any of the terms, provisions and covenants of this
                           lease.

                           Pursuit by Landlord of any of the foregoing remedies
                    or any other remedy provided by law shall not constitute a
                    forfeiture or waiver of any rent due to Landlord hereunder
                    or of any damages accruing to Landlord by reason of the
                    violation by Tenant of any of the terms, provisions and
                    covenants of this lease. In no event shall Tenant be
                    relieved from its obligation to pay the rentals specified in
                    this lease by reason of a surrender of possession,
                    termination of this lease or in any other manner whatsoever,
                    unless specifically agreed to in writing by Landlord.

                    No waiver by Landlord of any violation or breach of any of
                    the terms, provisions and covenants of this lease shall be
                    deemed or construed to constitute a waiver of any other
                    violation or breach of any of the terms, provisions and
                    covenants herein contained. Forbearance by Landlord to
                    enforce one or more of the remedies herein provided upon an
                    event of default shall not be deemed or construed to
                    constitute a waiver of such default.

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                           If Landlord incurs any expenses, including court
                    costs and attorney's fees, as a result of a default by
                    Tenant under this lease, then such expenses shall be
                    reimbursed by Tenant as additional rent, whether or not such
                    default is subsequently cured.

                           Tenants delinquent payments shall bear interest at
                    the rate of 18% per annum from the date of delinquency until
                    paid.

Compliance          Code Compliance Tenant shall, at its sole cost and expense,
With Laws 23.       comply or cause the Premises to comply with all applicable
                    laws, rules, regulations, requirements and ordinances now in
                    force or which may hereafter be in force (hereinafter
                    collectively referred to as "Laws"),including, without
                    limitation, The Americans With Disabilities Act, (the
                    "ADA"), which have been or which may be enacted or imposed
                    by any governmental unit concerning the Premises or Tenant's
                    use of the Premises, provided, however, Tenant shall not be
                    obligated or required to comply with any such laws that
                    require alterations, maintenance or restoration of the
                    Premises, unless the alteration, maintenance or restoration,
                    Is required as a result of (i) the manner of conduct of
                    Tenant's business or operation of Tenant's equipment or
                    other property therein, or (ii) any cause or condition
                    created by Tenant, or (iii) the breath of any of Tenant's
                    obligations or duties hereunder, or (iv) any alteration,
                    maintenance or restoration required by the ADA to be made to
                    the interior of the Premises, or (v) any alterations
                    required to the Building or common areas serving the
                    Building which the ADA may require Tenant to make as an
                    employer in order to make reasonable accommodations with
                    respect to those employees of Tenant which may be disabled.

                           Environmental Covenants Tenant shall not use, store,
                    manufacture dispose of or discharge any pollutants,
                    contaminates, or harmful or hazardous substances from or on
                    the Premises or otherwise occupy or permit the Premises to
                    be occupied or used in a manner which (i) violates any law,
                    regulation, rule or other governmental requirement, (ii)
                    impairs the health, safety or condition or any person or
                    property or (iii) adversely affects the use, enjoyment or
                    value of the Premises or the surrounding property. This
                    covenant excludes the storage of small quantity samples
                    being held prior to transfer to laboratories for analysis.
                    Tenant shall promptly notify Landlord of the breach, or the
                    potential or threatened breach, of any of the provisions of
                    this paragraph. Tenant shall indemnify and hold Landlord and
                    its officers, shareholders, partners, employees, aid agents,
                    harmless from any loss, claim, liability or expense
                    (including, without limitation, attorneys' fees, court
                    costs, consultant fees, expert fees, penalties, fines,
                    removal, clean-up, transportation, disposal and restoration
                    expenses) arising in connection with Tenant's failure to
                    comply with the provisions of this paragraph. A breach of
                    the provisions of this paragraph shall be a material default
                    enabling Landlord to exercise any of the remedies set forth
                    in this Lease. Tenant's obligation hereunder shall survive
                    the termination of this Lease.

Surrender and       At the expiration of the lease term, Tenant shall surrender
Definitions 24.     the leased premises in as good condition as they were in at
                    the beginning of the term, reasonable use and wear and
                    damage by the elements excepted.

                                        9
<PAGE>

                           Notwithstanding any provisions of law or any judicial
                    decision to the contrary, no notice shall be required to
                    terminate the term of this lease as herein provided, and the
                    term of this lease shall expire on the termination date
                    herein mentioned without notice being required from either
                    party. In the event that Tenant or any party holding under
                    Tenant shall remain in possession of the leased premises
                    beyond the expiration of the term of this lease, whether by
                    limitation or forfeiture, such party shall pay double rent
                    hereunder during such hold-over period

Notices  25.        Any notice required to be given by either party to the other
                    party under the terms of this tease shall be served upon it
                    or mailed by United States Certified Mail to said party as
                    follows:

                    To Landlord: Mrs. Carol Schreiber
                                      Managing Partner
                                      Lawrence Properties LLC
                                      12401 Englewood Rd.
                                      Ashland, Mo. 65010

                    To Tenant: Mr. Richard Kelecy, CFO

                                    Perma-Fix Environmental Services Inc.
                                    1940 N.W. 67th Pl
                                    Gainesville, FL 32653

Headings and               (a)      It is agreed that the headings and phrases
 Terminations 26.   as to the contents of particular paragraphs of this lease
                    are inserted only as a matter of convenience and for
                    reference, and in no way are intended to be a part of this
                    lease, or in any way to define, limit or describe the scope
                    or intent of the particular paragraph to which they refer.

                           (b)      Where in this instrument pronouns or words
                    indicating the singular number, appear, such words, shall be
                    considered as masculine, feminine or neuter pronouns or
                    words Indicating the plural number, and vice versa, where
                    the context indicates the propriety of such use.

Modification 27.    Landlord and Tenant agree that this lease contains the
                    entire agreement between them and shall not be modified in
                    any manner except by an instrument in writing signed by each
                    of them.

Benefit  28.        This lease shall inure to the benefit of and be binding upon
                    the Landlord and Tenant and their respective heirs,
                    executors, administrators, successors and assigns, as the
                    case may be.

Subordination 29.   Tenant agrees that upon request of Landlord and delivery to
                    it by any mortgagee of the leased premises of a
                    "Non-Disturbance Letter" as same is defined below, that this
                    Lease and Tenant's interest in this Lease will be
                    subordinated to any mortgage, deed of trust or other method
                    of financing or refinancing now or hereafter encumbering the
                    leased premises, the lands underlying the leased premises
                    and/or the

                                       10
<PAGE>

                    buildings of which leased premises comprise a part; and to
                    all renewals, modifications, replacements, consolidations
                    and extensions thereof. Tenant further agrees that in such
                    event it will execute and deliver any and all documents
                    necessary to evidence the subordination of its rights under
                    the lease and aforesaid. The "Non-Disturbance Letter"
                    referred to above shall be a letter from the holder of any
                    such mortgage, deed of trust or other security instrument to
                    the effect that in the event of a foreclosure or other
                    action taken under any such security instrument this lease
                    and the rights of Tenant hereunder will not be disturbed,
                    diminished or interfered with by such security holder, but
                    will continue in full force and effect so long as Tenant
                    shall not be in default hereunder.

                           In any event, If any such mortgage, deed of trust or
                    other security interest encumbering the leased premises is
                    foreclosed for any reason, and the holder of such mortgage,
                    deed of trust or other security instrument succeeds to the
                    interest of Landlord under this Lease, Tenant shall be bound
                    to such mortgage, deed of trust or security holder under all
                    of the terms of this lease for the balance of the term
                    thereof remaining, with the same force and effect as if said
                    mortgagee were the Landlord under this lease; and Tenant
                    hereby attorns to the mortgage as its Landlord, such
                    attornment to be effective and self-operative without the
                    execution of any further instrument on the part of either
                    parties hereto, immediately upon the mortgage succeeding to
                    the interest of Landlord under this lease.

Authority 30.       Each individual executing this document on behalf of a
                    corporation, partnership, trust or estate represents and
                    warrants that he has full power and authority to bind said
                    entity to the terms and conditions hereof.

Successors 31.      The provisions, covenants and conditions of this lease shall
                    bind and inure to the benefit of the legal representatives,
                    successors, and assigns of each of the parties, except that
                    no assignment or subletting by Tenant without the written
                    consent of Landlord shall vest any right in the assignee or
                    sublessee of Tenant

Renewal Option 32.  Tenant is hereby granted an option to extend the term of
                    this lease for a further period of 5 years from the date of
                    expiration of the original term hereof, provided this lease
                    shall, at the expiration of the original term, be in full
                    force and effect and the Tenant shall have fully performed
                    all of its terms and conditions. Such option shall be
                    exercised by written notice to Landlord, not less than six
                    (3) months prior to the expiration of the original term of
                    this lease. The extended term of this lease shall be on the
                    same terms and conditions as provided in this lease, except
                    that the annual fixed rent hereunder shall be increased by
                    the following amounts:

                    (a)    That, the amount which equals the percentage of
                           increase, if any, in the last Consumer Price Index of
                           the U.S. Bureau of Labor Statistics (All items Index
                           for the United States) issued immediately prior to
                           the beginning of the renewal term hereunder over the
                           last such Index published immediately prior to the
                           commencement of the original lease term.

                                       11
<PAGE>

                    IN WITNESS WHEREOF, the parties hereto have hereunto set
                    their hands the day and year first above mentioned.

                                      By:  Carol Schreiber
                                           -------------------------------------
                                           Landlord (Name)

                                           /s/ Carol Schreiber
                                           -------------------------------------
                                           Signature

                                           Managing Partner              2/20/06
                                           -------------------------------------
                                           Title                            Date

                                      By:  Richard T. Kelecy
                                           -------------------------------------
                                           Tenant (Name)

                                           /s/ Richard T. Kelecy
                                           -------------------------------------
                                           Signature

                                           V.P. Chief Financial Officer 02/16/06
---------------------------                -------------------------------------
Notary                                     Title                            Date

                                       12

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