<PAGE>   1
                                                                EXHIBIT 10.36

                         COMMERCIAL SECURITY AGREEMENT

<TABLE>
<CAPTION>
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   PRINCIPAL        LOAN DATE      MATURITY       LOAN NO      CALL/COLL        ACCOUNT    OFFICER     INITIALS
$4,000,000.00      12-22-2000     04-01-2001     40007839       1E/148                       JES
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<S>                <C>            <C>            <C>           <C>              <C>        <C>         <C>
         References in the shaded area are for Lender's use only and do not limit the applicability of this document
       to any particular loan or item. Any item above containing "***" has been omitted due to text length limitations.
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BORROWER:   EARTHCARE RESOURCE MANAGEMENT OF FLORIDA, INC.          LENDER:    MARINE BANK
            P.O. BOX 76843                                                     FRANKLIN BRANCH
            TAMPA, FL 33675                                                    10068 W. LOOMIS ROAD
                                                                               FRANKLIN, WI 53132

GRANTOR:    LIBERTY WASTE, INC. N/K/A EARTHCARE RESOURCE
            MANAGEMENT OF FLORIDA, INC.
            P.O. BOX 76843
            TAMPA, FL 33675
=============================================================================================================================
</TABLE>

     THIS COMMERCIAL SECURITY AGREEMENT DATED DECEMBER 22, 2000, IS MADE AND
     EXECUTED AMONG LIBERTY WASTE, INC. N/K/A EARTHCARE RESOURCE MANAGEMENT OF
     FLORIDA, INC. ("GRANTOR"); EARTHCARE RESOURCE MANAGEMENT OF FLORIDA, INC.
     ("BORROWER"); AND MARINE BANK ("LENDER").

     GRANT OF SECURITY INTEREST. FOR VALUABLE CONSIDERATION, GRANTOR GRANTS TO
     LENDER A SECURITY INTEREST IN THE COLLATERAL TO SECURE THE INDEBTEDNESS AND
     AGREES THAT LENDER SHALL HAVE THE RIGHTS STATED IN THIS AGREEMENT WITH
     RESPECT TO THE COLLATERAL, IN ADDITION TO ALL OTHER RIGHTS WHICH LENDER MAY
     HAVE BY LAW.

     COLLATERAL DESCRIPTION. The word "Collateral" as used in this Agreement
     means the following described property, whether now owned or hereafter
     acquired, whether now existing or hereafter arising, and wherever located,
     in which Grantor is giving to Lender a security interest for the payment of
     the indebtedness and performance of all other obligations under the Note
     and this Agreement:

          ALL INVENTORY, CHATTEL PAPER, ACCOUNTS, EQUIPMENT, GENERAL
          INTANGIBLES, DOCUMENTS, INSTRUMENTS, AND INVESTMENT PROPERTY, AS WELL
          AS ALL OPERATING RIGHTS UNDER SOLID WASTE LANDFILL PERMIT NO.
          35438-001-SO HILLSBOROUGH COUNTY, HELD BY LIBERTY WASTE, INC. N/K/A
          EARTHCARE RESOURCE MANAGEMENT OF FLORIDA, INC. AND ISSUED BY THE
          DEPARTMENT OF ENVIRONMENTAL PROTECTION, AND ANY AMENDMENTS THERETO.

In addition, the word "Collateral" also includes all the following, whether now
owned or hereafter acquired, whether now existing or hereafter arising, and
wherever located:

     (A) All accessions, attachments, accessories, replacements and additions to
     any of the collateral described herein, whether added now or later.

     (B) All products and produce of any of the property described in this
     Collateral section.

     (C) All accounts, general intangibles, instruments, rents, monies,
     payments, and all other rights, arising out of a sale, lease, or other
     disposition of any of the property described in this Collateral section.

     (D) All proceeds (including insurance proceeds) from the sale, destruction,
     loss, or other disposition of any of the property described in this
     Collateral section, and sums due from a third party who has damaged or
     destroyed the Collateral or from that party's insurer, whether due to
     judgment, settlement or other process.

     (E) All records and data relating to any of the property described in this
     Collateral section, whether in the form of a writing, photograph,
     microfilm, microfiche, or electronic media, together with all of Grantor's
     right, title, and interest in and to all computer software required to
     utilize, create, maintain, and process any such records or data on
     electronic media.

Despite any other provision of this Agreement, Lender is not granted, and will
not have, a nonpurchase money security interest in household goods, to the
extent such a security interest would be prohibited by applicable law. In
addition, if because of the type of any Property, Lender is required to give a
notice of the right to cancel under Truth in Lending for the indebtedness, then
Lender will not have a security interest in such Collateral unless and until
such a notice is given.

CROSS-COLLATERALIZATION. In addition to the Note, this Agreement secures all
obligations, debts and liabilities, plus interest thereon, of Borrower to
Lender, or any one or more of them, as well as all claims by Lender against
Borrower or any one or more of them, whether now existing or hereafter arising,
whether related or unrelated to the purpose of the Note, whether voluntary or
otherwise, whether due or not due, direct or indirect, absolute or contingent,
liquidated or unliquidated and whether Borrower may be liable individually or
jointly with others, whether obligated as guarantor, surety, accommodation party
or otherwise, and whether recovery upon such amounts may be or hereafter may
become barred by any statute of limitations, and whether the obligation to repay
such amounts may be or hereafter may become otherwise unenforceable.

BORROWER'S WAIVERS AND RESPONSIBILITIES. Except as otherwise required under this
Agreement or by applicable law, (A) Borrower agrees that Lender need not tell
Borrower about any action or inaction Lender takes in connection with this
Agreement; (B) Borrower assumes the responsibility for being and keeping
informed about the Collateral; and (C) Borrower waives any defenses that may
arise because of any action or inaction of Lender, including without limitation
any failure of Lender to realize upon the Collateral or any delay by Lender in
realizing upon the Collateral; and Borrower agrees to remain liable under the
Note no matter what action Lender takes or fails to take under this Agreement.

GRANTOR'S REPRESENTATIONS AND WARRANTIES. Grantor warrants that: (A) this
Agreement is executed at Borrower's request and not at the request of Lender;
(B) Grantor has the full right, power and authority to enter into this Agreement
and to pledge the Collateral to Lender; (C) Grantor has established adequate
means of obtaining from Borrower on a continuing basis information about
Borrower's financial condition; and (D) Lender has made no representation to
Grantor about Borrower or Borrower's creditworthiness.

GRANTOR'S WAIVERS. Grantor waives all requirements of presentment, protest,
demand, and notice of dishonor or non-payment to Borrower or Grantor, or any
other party to the Indebtedness or the Collateral. Lender may do any of the
following with respect to any obligation of any Borrower, without first
obtaining the consent of Grantor: (A) grant any extension or time for any
payment, (B) grant any renewal, (C) permit any modification or payment terms or
other terms, or (D) exchange or release any Collateral or other security. No
such act or failure to act shall affect Lender's rights against Grantor or the
Collateral.

RIGHT OF SETOFF. To the extent permitted by applicable law, Lender reserves a
right of setoff in all Grantor's accounts with Lender (whether checking,
savings, or some other account). This includes all accounts Grantor holds
jointly with someone else and all accounts Grantor may open in the future.
However, this does not include any IRA or Keogh accounts, or any trust accounts
for which setoff would be prohibited by law. Grantor authorizes Lender, to the
extent permitted by applicable law, to charge or setoff all sums on the
Indebtedness against any and all such accounts.

GRANTOR'S REPRESENTATIONS AND WARRANTIES WITH RESPECT TO THE COLLATERAL. With
respect to the Collateral, Grantor represents and promises to Lender that:
<PAGE>   2
                          COMMERCIAL SECURITY AGREEMENT
                                  (CONTINUED)                             PAGE 2
================================================================================

PERFECTION OF SECURITY INTEREST. Grantor agrees to execute financing statements
and to take whatever other actions are requested by Lender to perfect and
continue Lender's security interest in the Collateral. Upon request of Lender,
Grantor will deliver to Lender any and all of the documents evidencing or
constituting the Collateral, and Grantor will note Lender's interest upon any
and all chattel paper if not delivered to Lender to possession by Lender. THIS
IS A CONTINUING SECURITY AGREEMENT AND WILL CONTINUE IN EFFECT EVEN THOUGH ALL
OR ANY PART OF THE INDEBTEDNESS IS PAID IN FULL AND EVEN THOUGH FOR A PERIOD OF
TIME BORROWER MAY NOT BE INDEBTED TO LENDER.

NOTICES TO LENDER. Grantor will promptly notify Lender in writing at Lender's
address shown above (or such other addresses as Lender may designate from time
to time) prior to any (1) change in Grantor's name; (2) change in Grantor's
assumed business name(s); (3) change in the management of the corporation
Grantor; (4) change in the authorized signer(s); (5) change in Grantor's
principal office address; (6) conversion of Grantor to a new or different type
of business entity; or (7) change in any other aspect of Grantor that directly
or indirectly relates to any agreements between Grantor and Lender. No change in
Grantor's name will take effect until after Lender has been notified.

NO VIOLATION. The execution and delivery of this Agreement will not violate any
law or agreement governing Grantor or to which Grantor is a party, and its
certificate or articles of incorporation and bylaws do not prohibit any term or
condition of this Agreement.

ENFORCEABILITY OF COLLATERAL. To the extent that Collateral consists of
accounts, chattel paper, or general intangibles, as defined by the Uniform
Commercial Code, the Collateral is enforceable in accordance with its terms, is
genuine, and fully complies with all applicable laws and regulations concerning
form, content and manner of preparation and execution, and all persons appearing
to be obligated on the Collateral have authority and capacity to contract and
are in fact obligated as they appear to be on the Collateral. There shall be no
setoffs or counterclaims against any of the Collateral, and no agreement shall
have been made under which any deductions or discounts may be claimed concerning
the Collateral except those disclosed to Lender in writing.

LOCATION OF THE COLLATERAL. Except in the ordinary course of Grantor's business,
Grantor agrees to keep the Collateral at Grantor's address shown above or at
such other locations as are acceptable to Lender. Upon Lender's request, Grantor
will deliver to Lender in form satisfactory to Lender a schedule of real
properties and Collateral locations relating to Grantor's operations, including
without limitation the following: (1) all real property Grantor owns or is
purchasing; (2) all real property Grantor is renting or leasing; (3) all storage
facilities Grantor owns, rents, leases, or uses; and (4) all other properties
where Collateral is or may be located.

REMOVAL OF THE COLLATERAL. Except in the ordinary course of Grantor's business,
Grantor shall not remove the Collateral from its existing location without
Lender's prior written consent. Grantor shall, whenever requested, advise Lender
of the exact location of the Collateral.

TRANSACTIONS INVOLVING COLLATERAL. Except for inventory sold or accounts
collected in the ordinary course of Grantor's business, or as otherwise provided
for in this Agreement, Grantor shall not sell, offer to sell, or otherwise
transfer or dispose of the Collateral. Grantor shall not pledge, mortgage,
encumber or otherwise permit the Collateral to be subject to any lien, security
interest, encumbrance, or charge, other than the security interest provided for
in this Agreement, without the prior written consent of Lender. This includes
security interest even if junior in right to the security interests granted
under this Agreement. Unless waived by Lender, all proceeds from any disposition
of the Collateral (for whatever reason) shall be held in trust for Lender and
shall not be commingled with any other funds; provided however, this requirement
shall not constitute consent by Lender to any sale or other disposition. Upon
receipt, Grantor shall immediately deliver any such proceeds to Lender.

TITLE. Grantor represents and warrants to Lender that Grantor holds good and
marketable title to the Collateral, free and clear of all liens and encumbrances
except for the lien of this Agreement. No financing statement covering any of
the Collateral is on file in any public office other than those which reflect
the security interest created by this Agreement or to which Lender has
specifically consented. Grantor shall defend Lender's rights in the Collateral
against the claims and demands of all other persons.

REPAIRS AND MAINTENANCE. Grantor agrees to keep and maintain, and to cause
others to keep and maintain, the Collateral in good order, repair and condition
at all times while this Agreement remains in effect. Grantor further agrees to
pay when due all claims for work done on, or services rendered or material
furnished in connection with the Collateral so that no lien or encumbrance may
ever attach to or be filed against the Collateral.

INSPECTION OF COLLATERAL. Lender and Lender's designated representatives and
agents shall have the right at all reasonable times to examine and inspect the
Collateral wherever located.

TAXES, ASSESSMENTS AND LIENS. Grantor will pay when due all taxes, assessments
and liens upon the Collateral, its use or operation, upon this Agreement, upon
any promissory note or notes evidencing the indebtedness, or upon any of the
other Related Documents. Grantor may withhold any such payment or may elect to
contest any lien if Grantor is in good faith conducting an appropriate
proceeding to contest the obligation to pay and so long as Lender's interest in
the Collateral is not jeopardized in Lender's sole opinion. If the Collateral is
subjected to a lien which is not discharged within fifteen (15) days, Grantor
shall deposit with Lender cash, a sufficient corporate surety bond or other
security satisfactory to Lender in an amount adequate to provide for the
discharge of the lien plus any interest, costs, reasonable attorneys' fees or
other charges that could accrue as a result of foreclosure or sale of the
Collateral. In any contest Grantor shall defend itself and Lender and shall
satisfy any final adverse judgment before enforcement against the Collateral.
Grantor shall name Lender as an additional obligee under any surety bond
furnished in the contest proceedings. Grantor further agrees to furnish Lender
with evidence that such taxes, assessments, and governmental and other charges
have been paid in full and in a timely manner. Grantor may withhold any such
payment or may elect to contest any lien if Grantor is in good faith conducting
an appropriate proceeding to contest the obligation to pay and so long as
Lender's interest in the Collateral is no jeopardized.

COMPLIANCE WITH GOVERNMENTAL REQUIREMENTS. Grantor shall comply promptly with
all laws, ordinances, rules and regulations of all governmental authorities, now
or hereafter in effect, applicable to the ownership, production, disposition, or
use of the Collateral. Grantor may contest in good faith any such law, ordinance
or regulation and withhold compliance during any proceeding, including
appropriate appeals, so long as Lender's interest in the Collateral, in Lender's
opinion, is not jeopardized.

HAZARDOUS SUBSTANCES. Grantor represents and warrants that the Collateral never
has been, and never will be so long as this Agreement remains a lien on the
Collateral, used in violation of any Environmental Laws or for the generation,
manufacture, storage, transportation, treatment, disposal, release or threatened
release of any Hazardous Substance. The representations and warranties contained
herein are based on Grantor's due diligence in investigating the Collateral for
Hazardous Substances. Grantor hereby (1) releases and waives any future claims
against Lender for indemnity or contribution in the event Grantor becomes liable
for cleanup or other costs under any Environmental Laws, and (2) agrees to
indemnify and hold harmless Lender against any and all claims and losses
resulting from a breach of this provision of this Agreement. This obligation to
indemnify shall survive the payment of the indebtedness and the satisfaction of
this Agreement.

MAINTENANCE OF CASUALTY INSURANCE. Grantor shall procure and maintain all risks
insurance, including without limitation fire, theft and liability coverage
together with such other insurance as Lender may require with respect to the
Collateral in form amounts, coverages and basis deliver to Lender from time to
time the policies or certificates of insurance in form satisfactory to Lender,
including stipulations that coverages will not be cancelled or diminished
without at least ten (10) days' prior written notice to Lender and not including
any disclaimer of the insurer's liability for failure to give such a notice.
Each insurance policy also shall include an endorsement providing that coverage
in favor of Lender will not be impaired in any way by any act, omission or
default of Grantor or any other person. In connection with all policies covering
assets in which Lender
<PAGE>   3
                         COMMERCIAL SECURITY AGREEMENT
                                  (CONTINUED)                             PAGE 3
================================================================================

     holds or is offered a security interest, Grantor will provide Lender with
     such loss payable or other endorsements as lender may require. If Grantor
     at any time fails to obtain or maintain any insurance as required under
     this Agreement, Lender may (but shall not be obligated to) obtain such
     insurance as Lender deems appropriate, including if Lender so chooses
     "single interest insurance," which will cover only Lender's interest in the
     Collateral.

     APPLICATION OF INSURANCE PROCEEDS. Grantor shall promptly notify Lender of
     any loss or damage to the Collateral. Lender may make proof of loss if
     Grantor fails to do so within fifteen (15) days of the casualty. All
     proceeds of any insurance on the Collateral, including accrued proceeds
     thereon, shall be held by Lender as part of the Collateral. If Lender
     consents to repair or replacement of the damaged or destroyed Collateral,
     Lender shall, upon satisfactory proof of expenditure, pay or reimburse
     Grantor from the proceeds for the reasonable cost of repair or restoration.
     If Lender does not consent to repair or replacement of the Collateral,
     Lender shall retain a sufficient amount of the proceeds to pay all of the
     Indebtedness, and shall pay the balance to Grantor. Any proceeds which have
     not been disbursed within six (6) months after their receipt and which
     Grantor has not committed to the repair or restoration of the Collateral
     shall be used to prepay the Indebtedness.

     INSURANCE RESERVES. Lender may require Grantor to maintain with Lender
     reserves for payment of insurance premiums, which reserves shall be created
     by monthly payments from Grantor of a sum estimated by Lender to be
     sufficient to produce, at least fifteen (15) days before the premium due
     date, amounts at least equal to the insurance premiums to be paid. If
     fifteen (15) days before payment is due, the reserve funds are
     insufficient, Grantor shall upon demand pay any deficiency to Lender. The
     reserve funds shall be held by Lender as a general deposit and shall
     constitute a non-interest-bearing account which Lender may satisfy by
     payment of the insurance premiums required to be paid by Grantor as they
     become due. Lender does not hold the reserve funds in trust for Grantor,
     and Lender is not the agent of Grantor for payment of the insurance
     premiums required to be paid by Grantor. The responsibility for the payment
     of premiums shall remain Grantor's sole responsibility.

     INSURANCE REPORTS. Grantor, upon request of Lender, shall furnish to Lender
     reports on each existing policy of insurance showing such information as
     Lender may reasonably request including the following: (1) the name of the
     insurer; (2) the risks insured; (3) the amount of the policy; (4) the
     property insured; (5) the then current value on the basis of which
     insurance has been obtained and the manner of determining that value; and
     (6) the expiration date of the policy. In addition, Grantor shall upon
     request by Lender (however not more often than annually) have an
     independent appraiser satisfactory to Lender determine, as applicable, the
     cash value or replacement cost of the Collateral.

GRANTOR'S RIGHT TO POSSESSION. Until default, Grantor may have possession of the
tangible personal property and beneficial use of all the Collateral and may use
it in any lawful manner not inconsistent with this Agreement or the Related
Documents, provided that Grantor's right to possession and beneficial use shall
not apply to any Collateral where possession of the Collateral by Lender is
required by law to perfect Lender's security interest in such Collateral. If
Lender at any time has possession of any Collateral, whether before or after an
Event of Default, Lender shall be deemed to have exercised reasonable care in
the custody and preservation of the Collateral if Lender takes such action for
that purpose as Grantor shall request or as Lender, in Lender's sole discretion,
shall deem appropriate under the circumstances, but failure to honor any request
by Grantor shall not of itself be deemed to be a failure to exercise reasonable
care. Lender shall not be required to take any steps necessary to preserve any
rights in the Collateral against prior parties, nor to protect, preserve or
maintain any security interest given to secure the indebtedness.

LENDER'S EXPENDITURES. If any action or proceeding is commenced that would
materially affect Lender's interest in the Collateral or if Grantor fails to
comply with any provision of this Agreement or any Related Documents, including
but not limited to Grantor's failure to discharge or pay when due any amounts
Grantor is required to discharge or pay under this Agreement or any Related
Documents, Lender on Grantor's behalf may (but shall not be obligated to) take
any action that Lender deems appropriate, including but not limited to
discharging or paying all taxes, liens, security interests, encumbrances and
other claims, at any time levied or placed on the Collateral and paying all
costs for insuring, maintaining and preserving the Collateral. All such
expenditures incurred or paid by Lender for such purposes will then bear
interest at the rate charged under the Note from the date incurred or paid by
Lender to the date of repayment by Grantor. All such expenses will become a part
of the Indebtedness and, at Lender's option, will (A) be payable on demand; (B)
be added to the balance of the Note and be apportioned among and be payable with
any installment payments to become due during either (1) the term of any
applicable insurance policy; or (2) the remaining term of the Note; or (C) be
treated as a balloon payment which will be due and payable at the Note's
maturity. The Agreement also will secure payment of these amounts. Such right
shall be in addition to all other rights and remedies to which Lender may be
entitled upon Default.


DEFAULT. Each of the following shall constitute an Event of Default under this
Agreement:

     PAYMENT DEFAULT. Borrower fails to make any payment when due under the
     indebtedness.

     OTHER DEFAULTS. Borrower or Grantor fails to comply with or to perform any
     other term, obligation, covenant or condition contained in this Agreement
     or in any of the Related Documents or to comply with or to perform any
     term, obligation, covenant or condition contained in any other agreement
     between Lender and Borrower or Grantor.

     DEFAULT IN FAVOR OF THIRD PARTIES. Should Borrower or any Grantor default
     under any loan, extension of credit, security agreement, purchase or sales
     agreement, or any other agreement, in favor of any other creditor or person
     that may materially affect any of Borrower's property or Borrower's or any
     Grantor's ability to repay the Indebtedness or perform their respective
     obligations under this Agreement or any of the Related Documents.

     FALSE STATEMENTS. Any warranty, representation or statement made or
     furnished to Lender by Borrower or Grantor or on Borrower's or Grantor's
     behalf under this Agreement, the Note, or the Related Documents is false or
     misleading in any material respect, either now or at the time made or
     furnished or becomes false or misleading at any time thereafter.

     DEFECTIVE COLLATERALIZATION. This Agreement or any of the Related Documents
     ceases to be in full force and effect (including failure of any collateral
     document to create a valid and perfected security interest or lien) at any
     time and for any reason.

     INSOLVENCY. The dissolution or termination of Borrower's or Grantor's
     existence as a going business, the insolvency of Borrower or Grantor, the
     appointment of a receiver for any part of Borrower's or Grantor's property,
     any assignment for the benefit of creditors, any type of creditor workout,
     or the commencement of any proceeding under any bankruptcy or insolvency
     laws by or against Borrower or Grantor.

     CREDITOR OR FORFEITURE PROCEEDINGS. Commencement of foreclosure or
     forfeiture proceedings, whether by judicial proceeding, self-help,
     repossession or any other method, by any creditor or Borrower or Grantor or
     by any governmental agency against any collateral securing the
     Indebtedness. This includes a garnishment of any of Borrower's or Grantor's
     accounts, including deposit accounts, with Lender. However, this Event of
     Default shall not apply if there is a good faith dispute by Borrower or
     Grantor as to the validity or reasonableness of the claim which is the
     basis of the creditor or forfeiture proceeding and if Borrower or Grantor
     gives Lender written notice of the creditor of forfeiture proceeding and
     deposits with Lender monies or a surety bond for the creditor or forfeiture
     proceeding, in an amount determined by Lender, in its sole discretion, as
     being an adequate reserve or bond for the dispute.

     EVENTS AFFECTING GUARANTOR. Any of the preceding events occurs with respect
     to Guarantor of any of the Indebtedness or Guarantor dies or becomes
     incompetent or revokes or disputes the validity of, or liability under, any
     Guaranty of the Indebtedness.

     ADVERSE CHANGE. A material adverse change occurs in Borrower's or Grantor's
     financial condition, or Lender believes the prospect of payment or
     performance of the Indebtedness is impaired.


<PAGE>   4

                          COMMERCIAL SECURITY AGREEMENT
                                   (CONTINUED)                            PAGE 4
================================================================================



     INSECURITY. Lender in good faith believes itself insecure.

RIGHTS AND REMEDIES ON DEFAULT. If an Event of Default occurs under this
Agreement, at any time thereafter, Lender shall have all the rights of a secured
party under the Florida Uniform Commercial Code. In addition and without
limitation, Lender may exercise any one or more of the following rights and
remedies:

     ACCELERATE INDEBTEDNESS. Lender may declare the entire Indebtedness,
     including any prepayment penalty which Borrower would be required to pay,
     immediately due and payable, without notice of any kind to Borrower or
     Grantor.

     ASSEMBLE COLLATERAL. Lender may require Grantor to deliver to Lender all or
     any portion of the Collateral and any and all certificates of title and
     other documents relating to the Collateral. Lender may require Grantor to
     assemble the Collateral and make it available to Lender at a place to be
     designated by Lender. Lender also shall have full power to enter upon the
     property of Grantor to take possession of and remove the Collateral. If the
     Collateral contains other goods not covered by this Agreement at the time
     of repossession, Grantor agrees Lender may take such other goods, provided
     that Lender makes reasonable efforts to return them to Grantor after
     repossession.

     SELL THE COLLATERAL. Lender shall have full power to sell, lease, transfer,
     or otherwise deal with the Collateral or proceeds thereof in Lender's own
     name or that of Grantor. Lender may sell the Collateral at public auction
     or private sale. Unless the Collateral threatens to decline speedily in
     value or is of a type customarily sold on a recognized market, Lender will
     give Grantor reasonable notice of the time after which any private sale or
     any other intended disposition of the Collateral is to be made. The
     requirements of reasonable notice shall be met if such notice is given at
     least fifteen (15) days before the time of the sale or disposition. All
     expenses relating to the disposition of the Collateral, including without
     limitation the expenses of retaking, holding, insuring, preparing for sale
     and selling the Collateral, shall become a part of the Indebtedness secured
     by this Agreement and shall be payable on demand, with interest at the Note
     rate from date of expenditure until repaid.

     APPOINT RECEIVER. In the event of a suit being instituted to foreclose this
     Agreement, Lender shall be entitled to apply at any time pending such
     foreclosure suit to the court having jurisdiction thereof for the
     appointment of a receiver of any or all of the Collateral, and of all
     rents, incomes, profits, issues and revenues thereof, from whatsoever
     source. The parties agree that the court shall forthwith appoint such
     receiver with the usual powers and duties of receivers in like cases. Such
     appointment shall be made by the court as a matter of strict right to
     Lender and without notice to Grantor, and without reference to the adequacy
     or inadequacy of the value of the Collateral, or to Grantor's solvency or
     any other party defendant to such suit. Grantor hereby specifically waives
     the right to object to the appointment of a receiver and agrees that such
     appointment shall be made as an admitted equity and as a matter of absolute
     right to Lender, and consents to the appointment of any officer or employee
     of Lender as receiver. Lender shall have the right to have a receiver
     appointed to take possession of all or any part of the Collateral, with the
     power to protect and preserve the Collateral, to operate the Collateral
     preceding foreclosure or sale, and to collect the Rents from the Collateral
     and apply the proceeds, over and above the cost of the receivership,
     against the Indebtedness. The receiver may serve without bond if permitted
     by law. Lender's right to the appointment of a receiver shall exist whether
     or not the apparent value of the Collateral exceeds the Indebtedness by a
     substantial amount. Employment by Lender shall not disqualify a person from
     serving as a receiver.

     COLLECT REVENUES, APPLY ACCOUNTS. Lender, either itself or through a
     receiver, may collect the payments, rents, income, and revenues from the
     Collateral. Lender may at any time in Lender's discretion transfer any
     Collateral into Lender's own name or that of Lender's nominee and receive
     the payments, rents, income, and revenues therefrom and hold the same as
     security for the Indebtedness or apply it to payment of the Indebtedness in
     such order of preference as Lender may determine. Insofar as the Collateral
     consists of accounts, general intangibles, insurance policies, instruments,
     chattel paper, choses in action, or similar property, Lender may demand,
     collect, receipt for, settle, compromise, adjust, sue for, foreclose, or
     realize on the Collateral as Lender may determine, whether or not
     Indebtedness or Collateral is then due. For these purposes, Lender may, on
     behalf of and in the name of Grantor, receive, open and dispose of mail
     addressed to Grantor; change any address to which mail and payments are to
     be sent; and endorse notes, checks, drafts, money orders, documents of
     title, instruments and items pertaining to payment, shipment, or storage of
     any Collateral. To facilitate collection, Lender may notify account debtors
     and obligors on any Collateral to make payments directly to Lender.

     OBTAIN DEFICIENCY. If Lender chooses to sell any or all of the Collateral,
     Lender may obtain a judgment against Borrower for any deficiency remaining
     on the Indebtedness due to Lender after application of all amounts received
     from the exercise of the rights provided in this Agreement. Borrower shall
     be liable for a deficiency even if the transaction described in this
     subsection is a sale of accounts or chattel paper.

     OTHER RIGHTS AND REMEDIES. Lender shall have all the rights and remedies of
     a secured creditor under the provisions of the Uniform Commercial Code, as
     may be amended from time to time. In addition, Lender shall have and may
     exercise any or all other rights and remedies it may have available at law,
     in equity, or otherwise.

     ELECTION OF REMEDIES. Except as may be prohibited by applicable law, all of
     Lender's rights and remedies, whether evidenced by this Agreement, the
     Related Documents, or by any other writing, shall be cumulative and may be
     exercised singularly or concurrently. Election by Lender to pursue any
     remedy shall not exclude pursuit of any other remedy, and an election to
     make expenditures or to take action to perform an obligation of Grantor
     under this Agreement, after Grantor's failure to perform, shall not affect
     Lender's right to declare a default and exercise its remedies.

MISCELLANEOUS PROVISIONS. The following miscellaneous provisions are a part of
this Agreement:

     AMENDMENTS. This Agreement, together with any Related Documents,
     constitutes the entire understanding and agreement of the parties as to the
     matters set forth in this Agreement. No alteration of or amendment to this
     Agreement shall be effective unless given in writing and signed by the
     party or parties sought to be charged or bound by the alteration or
     amendment.

     ATTORNEYS' FEES; EXPENSES. Grantor agrees to pay upon demand all of
     Lender's costs and expenses, including Lender's reasonable attorneys' fees
     and Lender's legal expenses, incurred in connection with the enforcement of
     this Agreement. Lender may hire or pay someone else to help enforce this
     Agreement, and Grantor shall pay the costs and expenses of such
     enforcement. Costs and expenses include Lender's reasonable attorneys' fees
     and legal expenses whether or not there is a lawsuit, including reasonable
     attorneys' fees and legal expenses for bankruptcy proceedings (including
     efforts to modify or vacate any automatic stay or injunction), appeals, and
     any anticipated post-judgment collection services. Grantor also shall pay
     all court costs and such additional fees as may be directed by the court.

     CAPTION HEADINGS. Caption headings in this Agreement are for convenience
     purposes only and are not to be used to interpret or define the provisions
     of this Agreement.

     GOVERNING LAW. THIS AGREEMENT WILL BE GOVERNED BY, CONSTRUED AND ENFORCED
     IN ACCORDANCE WITH FEDERAL LAW AND THE LAWS OF THE STATE OF WISCONSIN,
     EXCEPT AND ONLY TO THE EXTENT OF PROCEDURAL MATTERS RELATED TO THE
     PERFECTION AND ENFORCEMENT OF LENDER'S RIGHTS AND REMEDIES AGAINST THE
     COLLATERAL, WHICH MATTERS SHALL BE GOVERNED BY THE LAWS OF THE STATE OF
     FLORIDA. HOWEVER, IN THE EVENT THAT THE ENFORCEABILITY OR VALIDITY OF ANY
     PROVISION OF THIS AGREEMENT IS CHALLENGED OR QUESTIONED, SUCH PROVISION
     SHALL BE GOVERNED BY WHICHEVER APPLICABLE STATE OR FEDERAL LAW WOULD UPHOLD
     OR WOULD ENFORCE SUCH CHALLENGED OR QUESTIONED PROVISION. THE LOAN
     TRANSACTION WHICH IS EVIDENCED BY THE NOTE AND THIS AGREEMENT HAS BEEN
     APPLIED FOR, CONSIDERED, APPROVED AND MADE, AND ALL NECESSARY LOAN
     DOCUMENTS HAVE BEEN ACCEPTED BY LENDER IN THE STATE OF WISCONSIN.

     CHOICE OF VENUE. If there is a lawsuit, Grantor agrees upon Lender's
     request to submit to the jurisdiction of the courts of Milwaukee County,
     State









<PAGE>   5

                         COMMERCIAL SECURITY AGREEMENT
                                  (CONTINUED)                             PAGE 5
================================================================================

     of Wisconsin.

     JOINT AND SEVERAL LIABILITY. All obligations of Borrower and Grantor under
     this Agreement shall be joint and several, and all references to Grantor
     shall mean each and every Grantor, and all references to Borrower shall
     mean each and every Borrower. This means that each Borrower and Grantor
     signing below is responsible for all obligations in this Agreement. Where
     any one or more of the parties is a corporation, partnership, limited
     liability company or similar entity, it is not necessary for Lender to
     inquire into powers of any of the officers, directors, partners, members,
     or other agents acting or purporting to act on the entity's behalf, and any
     obligations made or created in reliance upon the professed exercise of such
     powers shall be guaranteed under this Agreement.

     NO WAIVER BY LENDER. Lender shall not be deemed to have waived any rights
     under this Agreement unless such waiver is given in writing and signed by
     Lender. No delay or omission on the part of Lender in exercising any right
     shall operate as a waiver of such right or any other right. A waiver by
     Lender of a provision of this Agreement shall not prejudice or constitute a
     waiver of Lender's right otherwise to demand strict compliance with that
     provision or any other provision of this Agreement. No prior waiver by
     Lender, nor any course of dealing between Lender and Grantor, shall
     constitute a waiver of any of Lender's rights or of any of Grantor's
     obligations as to any future transactions. Whenever the consent of Lender
     is required under this Agreement, the granting of such consent by Lender in
     any instance shall not constitute continuing consent to subsequent
     instances where such consent is required and in all cases such consent may
     be granted or withheld in the sole discretion of Lender.

     NOTICES. Any notice required to be given under this Agreement shall be
     given in writing, and shall be effective when actually delivered, when
     actually received by telefacsimile (unless otherwise required by law), when
     deposited with a nationally recognized overnight courier, or, if mailed,
     when deposited in the United States mail, as first class, certified or
     registered mail postage prepaid, directed to the addresses shown near the
     beginning of this Agreement. Any party may change its address for notices
     under this Agreement by giving written notice to the other parties,
     specifying that the purpose of the notice is to change the party's address.
     For notice purposes, Grantor agrees to keep Lender informed at all times of
     Grantor's current address. Unless otherwise provided or required by law, if
     there is more than one Grantor, any notice given by Lender to any Grantor
     is deemed to be notice given to all Grantors.

     POWER OF ATTORNEY. Grantor hereby appoints Lender as Grantor's irrevocable
     attorney-in-fact for the purpose of executing any documents necessary to
     perfect or to continue the security interest granted in this Agreement.
     Lender may at any time, and without further authorization from Grantor,
     file a carbon, photographic or other reproduction of any financing
     statement or of this Agreement for use as a financing statement. Grantor
     will reimburse Lender for all expenses for the perfection and the
     continuation of the perfection of Lender's security interest in the
     Collateral.

     SEVERABILITY. If a court of competent jurisdiction finds any provision of
     this Agreement to be illegal, invalid, or unenforceable as to any
     circumstance, that finding shall not make the offending provision illegal,
     invalid, or unenforceable as to any other circumstance. If feasible, the
     offending provision shall be considered modified so that it becomes legal,
     valid and enforceable. If the offending provision cannot be so modified, it
     shall be considered deleted from this Agreement. Unless otherwise required
     by law, the illegality, invalidity, or unenforceability of any provision of
     this Agreement shall not affect the legality, validity or enforceability of
     any other provision of this Agreement.

     SUCCESSORS AND ASSIGNS. Subject to any limitations stated in this Agreement
     on transfer of Grantor's interest, this Agreement shall be binding upon and
     inure to the benefit of the parties, their successors and assigns. If
     ownership of the Collateral becomes vested in a person other than Grantor,
     Lender, without notice to Grantor, may deal with Grantor's successors with
     reference to this Agreement and the Indebtedness by way of forbearance or
     extension without releasing Grantor from the obligations of this Agreement
     or liability under the Indebtedness.

     SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All representations,
     warranties, and agreements made by Grantor in this Agreement shall survive
     the execution and delivery of this Agreement, shall be continuing in
     nature, and shall remain in full force and effect until such time as
     Borrower's Indebtedness shall be paid in full.

     TIME IS OF THE ESSENCE. Time is of the essence in the performance of this
     Agreement.

DEFINITIONS. The following capitalized words and terms shall have the following
meanings when used in this Agreement. Unless specifically stated to the
contrary, all references to dollar amounts shall mean amounts in lawful money of
the United States of America. Words and terms used in the singular shall include
the plural, and the plural shall include the singular, as the context may
require. Words and terms not otherwise defined in this Agreement shall have the
meanings attributed to such terms in the Uniform Commercial Code:

     AGREEMENT. The word "Agreement" means this Commercial Security Agreement,
     as this Commercial Security Agreement may be amended or modified from time
     to time, together with all exhibits and schedules attached to this
     Commercial Security Agreement from time to time.

     BORROWER. The word "Borrower" means EarthCare Resource Management of
     Florida, Inc., and all other persons and entities signing the Note in
     whatever capacity.

     COLLATERAL. The word "Collateral" means all of Grantor's right, title and
     interest in and to all the Collateral as described in the Collateral
     Description section of this Agreement.

     DEFAULT. The word "Default" means the Default set forth in this Agreement
     in the section titled "Default".

     ENVIRONMENTAL LAWS. The words "Environmental Laws" mean any and all state,
     federal and local statutes, regulations and ordinances relating to the
     protection of human health or the environment, including without limitation
     the Comprehensive Environmental Response, Compensation, and Liability Act
     of 1980, as amended, 42 U.S.C. Section 9601, et seq. ("CERCLA"), the
     Superfund Amendments and Reauthorization Act of 1986, Pub. L. No. 99-499
     ("SARA"), the Hazardous Materials Transportation Act, 49 U.S.C. Section
     1801, et seq., the Resource Conversation and Recovery Act, 42 U.S.C.
     Section 6901, et seq., or other applicable state or federal laws, rules, or
     regulations adopted pursuant thereto.

     EVENT OF DEFAULT. The words "Event of Default" mean any of the events of
     default set forth in this Agreement in the default section of this
     Agreement.

     GRANTOR. The word "Grantor" means Liberty Waste, Inc. n/k/a EarthCare
     Resource Management of Florida, Inc.

     GUARANTOR. The word "Guarantor" means any guarantor, surety, or
     accommodation party of any or all of the Indebtedness.

     GUARANTY. The word "Guaranty" means any guaranty from Guarantor to Lender,
     including without limitation a guaranty of all or part of the Note.

     HAZARDOUS SUBSTANCES. The words "Hazardous Substances" mean materials that,
     because of their quantity, concentration or physical, chemical or
     infectious characteristics, may cause or pose a present or potential hazard
     to human health or the environment when improperly used, treated, stored,
     disposed of, generated, manufactured, transported or otherwise handled. The
     words "Hazardous Substances" are used in their very broadest sense and
     include without limitation any and all hazardous or toxic substances,
     materials or waste as defined by or listed under the Environmental Laws.
     The term "Hazardous Substances" also includes, without limitation,
     petroleum and petroleum by-products or any fraction thereof and asbestos.

     INDEBTEDNESS. The word "Indebtedness" means the indebtedness evidenced by
     the Note or Related Documents, including all principal and interest
     together with all other indebtedness and costs and expenses for which
     Borrower is responsible under this Agreement or under any of


<PAGE>   6
                         COMMERCIAL SECURITY AGREEMENT
                                  (CONTINUED)                             PAGE 6
================================================================================

     the Related Documents.

     LENDER. The word "Lender" means Marine Bank, its successors and assigns.

     NOTE. The word "Note" means the Note executed by Borrower in the principal
     amount of $4,000,000.00 dated December 22, 2000, together with all renewals
     of, extensions of, modifications of, refinancings of, consolidations of,
     and substitutions for the note or credit agreement.

     RELATED DOCUMENTS.  The words "Related Documents" mean all promissory
     notes, credit agreements, loan agreements, environmental agreements,
     guaranties, security agreements, mortgages, deeds of trust, security
     deeds, collateral mortgages, and all other instruments, agreements and
     documents, whether now or hereafter existing, executed in connection with
     the indebtedness.

     BORROWER AND GRANTOR HAVE READ AND UNDERSTOOD ALL THE PROVISIONS OF THIS
     COMMERCIAL SECURITY AGREEMENT AND AGREE TO ITS TERMS. THIS AGREEMENT IS
     DATED DECEMBER 22, 2000.

GRANTOR:



LIBERTY WASTE, INC. N/K/A EARTHCARE RESOURCE MANAGEMENT OF FLORIDA, INC.

By:
   ---------------------------------------------------
   WILLIAM W. SOLOMON, JR., CHIEF FINANCIAL OFFICER OF
   LIBERTY WASTE, INC. N/K/A EARTHCARE RESOURCE
   MANAGEMENT OF FLORIDA, INC.

BORROWER:



EARTHCARE RESOURCE MANAGEMENT OF FLORIDA, INC.

By:
   ---------------------------------------------------
   WILLIAM W. SOLOMON, JR., CHIEF FINANCIAL OFFICER OF
   EARTHCARE RESOURCE MANAGEMENT OF FLORIDA, INC.