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                                                                     Exhibit 4.4


                    ELECTRIC RATE STABILIZATION BOND PROGRAM

                           LIMITED GUARANTY AGREEMENT

         This Guaranty  Agreement dated as of June 1, 1998, (the  "Guaranty") is
given by KTI,  INC., a corporation  organized and existing under the laws of the
State of New Jersey (the  "Guarantor")  to THE CHASE  MANHATTAN BANK, as Trustee
(the "Trustee").

         WHEREAS,  the Finance  Authority of Maine ("the  Authority") has agreed
with Penobscot Energy Recovery Company,  Limited Partnership (the "Borrower") to
issue its Series 1998  Electric  Rate  Stabilization  Revenue  Refunding  Bonds,
Series 1998A and Series 1998B  (Penobscot  Energy Recovery  Company,  LP) in the
aggregate  principal  amount of  $44,995,000  (the  "1998  Bonds"),  which  will
contemporaneously  herewith  be issued to finance a loan (the  "Loan")  from the
Authority  to  Penobscot  Energy  Recovery  Company,  Limited  Partnership  (the
"Borrower")  pursuant  to a  Loan  Agreement  dated  as of  June  1,  1998  (the
"Agreement"); and

         WHEREAS, the Agreement will be assigned by the Authority to the Trustee
(except  for  certain  Unassigned  Issuers  Rights and Shared  Rights as defined
therein), contemporaneously with the execution thereof; and

         WHEREAS,  the  obligation of the Borrower to the Authority  pursuant to
the Agreement is evidenced by a promissory note of the Borrower to the Authority
(the "Loan Note"); and

         WHEREAS,  the  Trustee  has  entered  into a Trust  Indenture  with the
Authority dated as of June 1, 1998 (the "Indenture"); and

         WHEREAS,  the Guarantor is the sole  shareholder of PERC,  Inc.;  PERC,
Inc. is the general partner of PERC Management  Company Limited  Partnership,  a
general partner of the Borrower; and

         WHEREAS,  in  order to  induce  the  Authority  to make the Loan to the
Borrower,  the  Guarantor is prepared to guarantee  the payment and  performance
when due of the  obligations  of the  Borrower to the  Authority  under the Loan
Agreement, subject to the limitations hereinafter set forth; and

         WHEREAS, the Guarantor acknowledges that it will be benefited by the
Authority making the Loan to the Borrower; and

         WHEREAS,  for the purpose of providing  security for the payment of the
Loan Note and other sums provided for in the  Agreement,  the  Guarantor  hereby
agrees to guaranty the prompt and  punctual  payment of the Loan and other sums,
as  more  fully  set  forth  herein  and in the  Indenture  and  subject  to the
limitations herein; and

         NOW, THEREFORE, in consideration of the premises and in order to induce
the Authority to issue the 1998 Bonds and make the Loan,  the  Guarantor  hereby
covenants and agrees with the Trustee as follows:


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                                    ARTICLE I

                         REPRESENTATIONS AND WARRANTIES

         Section 1.1. Representations and Warranties. The Guarantor hereby
represents and warrants as follows:

                  (1) The Guarantor is a  corporation  duly  organized,  validly
existing and in good standing under the laws of the State of New Jersey, has the
corporate  powers and authority to own its property and assets,  to carry on its
business as now being  conducted by it and to execute,  deliver and perform this
Guaranty.  The Guarantor is duly qualified to do business in every  jurisdiction
in which such qualification is necessary.

                  (2) The execution,  delivery and  performance of this Guaranty
and the  consummation of the  transactions  herein  contemplated  have been duly
authorized  by all requisite  corporate  action on the part of the Guarantor and
will not violate any provision of law, any order of any court or other agency of
government or the certificate of  incorporation  or bylaws of the Guarantor,  or
any material provision of any indenture,  agreement or other instrument to which
the  Guarantor is a party or by which it or any of its property is bound,  or be
in conflict with or result in a breach of or constitute  (with due notice and/or
lapse of time) a default under any such indenture, agreement or other instrument
for which a waiver has not been obtained.

                  (3)  The  acceptance  by  the  Guarantor  of  its  obligations
hereunder will result in a material financial benefit to the Guarantor.

                  (4) This  Guaranty  constitutes  a valid and  legally  binding
obligation of the Guarantor, enforceable in accordance with its terms.

                  (5)  There  is no  action  or  proceeding  pending  or to  the
knowledge of the Guarantor, threatened against the Guarantor before any court or
administrative  agency  which,  if determined  adversely to the Guarantor  would
materially  adversely  affect  the  ability  of the  Guarantor  to  perform  its
obligations  hereunder,  except  as may be  disclosed  in its  filings  with the
Securities and Exchange Commission.

                  (6) No authorizations, approvals or other actions are required
by any governmental authority or regulatory body for due execution, delivery and
performance by the Guarantor of this Guaranty.

                  (7) The  Guarantor has  fulfilled  its  obligations  under the
minimum funding  standards of ERISA with respect to any employee pension benefit
plan which is covered by Title 4 of ERISA,  which is the  subject of the minimum
funding standard under Section 412 of the Internal Revenue Code, and as to which
the Guarantor may have liability (or with respect to a  multi-employer  Plan has
made all required  contributions)  and is in compliance in all material respects
with applicable provisions of ERISA.


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                                   ARTICLE II

                            COVENANTS AND AGREEMENTS

         Section 2.1. The Guaranty.

         (A) The  Guarantor  hereby  unconditionally  guaranties  to and for the
account of the  Trustee  for the benefit of the holders of the 1998 Bonds and to
and for the benefit of the Authority as holder of the Loan Note to the extent of
this  Guaranty  as  limited by Section  2.1(C)  hereof,  (i) the full and prompt
payment  of the  principal  on the Loan when and as the same shall  become  due,
whether  by  demand  or at the  stated  maturity  thereof,  by  acceleration  or
otherwise; (ii) the full and prompt payment of the interest on the Loan when and
as the same shall become due and payable;  (iii) the full and prompt  payment of
all principal,  interest and other sums due and payable on the Loan Note and any
other sums when and as the same shall become due and payable under the Financing
Documents (as that term is defined in the Agreement), required to be paid by the
Borrower under the terms of the Agreement,  whether by acceleration or otherwise
(the "Obligations")

         (B) The Guarantor hereby expressly acknowledges and agrees to the terms
of Article V of the Indenture,  a copy of which Article V is attached  hereto as
Exhibit A and incorporated  herein to the extent such terms affect or create the
obligation of the Guarantor to make payment of the Obligations and create rights
of the Trustee to enforce this Guaranty.

         (C) The  Guarantor  further  agrees  that each of its  undertakings  in
subsection  2.1(A) and 2.1(B)  above  constitutes  an  absolute,  unconditional,
present and continuing  guaranty provided,  however,  that the obligation of the
Guarantor  to pay such  Obligation  shall be  limited to  $3,000,000,  provided,
however,  if any amounts are paid by the  Guarantor  to the Trustee  pursuant to
this Guaranty,  and the Trustee thereafter  reimburses the Guarantor pursuant to
Section  5.03(9)  and  Section  5.11 of the  Indenture,  this  Guaranty  will be
reinstated by the amount of such  reimbursement.  The Guarantor waives any right
to require that any resort be had by the Trustee to (i) any particular  security
held by the  Authority  or the  Trustee  (except as  otherwise  provided  in the
Indenture)  or (ii) the  performance  of any  obligation of the Authority or the
Trustee under the Indenture.

         (D) If the Borrower  shall  default in payment of the  Obligations  the
Guarantor,  upon demand by the Trustee without notice other than such demand and
without  the  necessity  of  further  action  on  their  respective   parts,  or
Guarantor's  successors or assigns,  as the case may be, will promptly and fully
comply with the efforts of the Trustee to enforce this  Guaranty.  The Guarantor
will pay all  reasonable  costs and expenses,  including  reasonable  attorneys'
fees,  paid or incurred by the Trustee in connection with the enforcement of the
obligations of the Guarantor under this Guaranty.  All payments by the Guarantor
shall be made in any coin or currency of the United  States of America  which on
the  respective  dates of  payment  thereof is legal  tender for the  payment of
public  and  private  debts  within  two (2)  Business  Days of demand  from the
Trustee.

         Section 2.2.  Absolute and Unconditional  Limited  Guaranty.  Except as
expressly  limited by the terms hereof,  the  obligations of the Guarantor under
this Guaranty are absolute and  unconditional and shall remain in full force and
effect until every payment,  obligation or liability  guaranteed hereunder shall
have been fully and finally  paid,  and, to the extent  permitted  by law,  such
obligations shall not be


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affected, modified, released, or impaired by any state of facts or the happening
from  time  to time  of any  event  including,  without  limitation,  any of the
following, whether or not with notice to, or the consent of, the Guarantor:

                  (1) the termination,  cancellation,  invalidity, irregularity,
illegality or unenforceability  of, or any defect in, the Indenture,  any of the
1998 Bonds, this Guaranty,  the Agreement,  the Loan Note or any other Financing
Documents;

                  (2)   the   compromise,    settlement,   release,   extension,
indulgence,   change,   modification  or  termination  of  any  or  all  of  the
obligations,  covenants  or  agreements  of the  Agreement,  the Loan Note,  the
Indenture,  the 1998  Bonds,  or any other  guaranties,  or any other  Financing
Documents;

                  (3)  the  failure  to  give  notice  to the  Guarantor  of the
occurrence  of any Event of  Default  under the  terms  and  provisions  of this
Guaranty,  the Indenture,  the Agreement,  the Loan Note or any other  Financing
Documents;

                  (4) the waiver of the payment,  performance  or  observance by
the Authority or the Trustee of any of the obligations, conditions, covenants or
agreements of any or all of them contained in this Guaranty, the Indenture,  the
1998 Bonds the Agreement,  the Loan Note or any other Financing Documents by the
Authority or the Trustee, as the case may be;

                  (5) the extension of the time for payment of the principal of,
premium if any, or interest on the 1998 Bonds or the  principal  of, or interest
on the 1998 Bonds or any other  amounts that are due or may become due under the
Financing  Documents or of the time for  performance  of any other  obligations,
covenants or agreements under or arising out of the Financing Documents;

                  (6)  the  modification  or  amendment   (whether  material  or
otherwise)  of any duty,  obligation,  covenant  or  agreement  set forth in the
Indenture, the 1998 Bonds, or any of the Financing Documents;

                  (7) any failure,  omission,  delay or lack thereof on the part
of the Authority or the Trustee to assert or exercise any right, power or remedy
conferred on either of them in the Indenture, the 1998 Bonds, this Guaranty, the
Agreement, or any other Financing Documents;

                  (8) the  voluntary or  involuntary  liquidation,  dissolution,
merger, consolidation, sale or other disposition of all or substantially all the
assets,  marshalling  of  assets  and  liabilities,   receivership,  insolvency,
bankruptcy,   assignment   for  the   benefit  of   creditors,   reorganization,
arrangement,  composition with creditors, or other similar proceedings affecting
the  Guarantor,  any other  guarantors,  or the  Borrower,  the Authority or the
Trustee,  or any or all of the  assets  of any of  them,  or any  allegation  or
contest  of the  validity  of  the  Indenture,  the  1998  Bonds,  or any of the
Financing  Documents  including  this  Guaranty  in any such  proceeding;  it is
specifically understood, consented and agreed to that this Guaranty shall remain
and  continue  in full  force and effect and shall be  enforceable  against  the
Guarantor  to the same  extent  and with the same  force  and  effect as if such
proceedings  had not been  instituted;  and it is the intent and purpose of this
Guaranty that the Guarantor  shall and does hereby waive all rights and benefits
which might accrue to the Guarantor by reason of any such


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proceedings, and without limiting the generality of the foregoing, it is further
the intent and purpose of this  Guaranty  that the  liability  of the  Guarantor
shall not be in any way limited by the filing of any  bankruptcy  involving  the
Borrower,  but rather shall in all respects  continue and extend to include,  by
way of example and not limitation,  post-filing  interests and costs,  including
reasonable attorney's fees;

                  (9) to the extent  permitted  by law, the release or discharge
of the Guarantor from the performance or observance of any obligation,  covenant
or agreement  contained in this  Guaranty by operation of law or the addition or
release of any other guarantor;

                  (10) the default or failure of any other guarantor fully to
perform any of its obligations set forth in any other guaranty;

                  (11) any release, substitution, replacement, destruction, loss
or impairment of the security pledged under the Financing Documents;

                  (12) any failure of the Authority or the Trustee to mitigate
damages resulting from any default by the Borrower under the Financing
Documents;

                  (13) any other circumstances which might otherwise constitute
a legal or equitable discharge or defense of a surety or a guarantor; or

                  (14) any  other act of  commission  or  omission  or any other
occurrence whatsoever, whether similar or dissimilar to the foregoing.

         Section 2.3. Qualified Letter of Credit; Release of Guaranty.  With the
written consent of the Authority,  the Guarantor may provide as a substitute for
this  Guaranty  a  letter  of  credit  satisfactory  to the  Authority  for this
Guaranty.

         Section  2.4.  Changes  in  Ownership;  Continuing  Existence.  (a) The
Guarantor will maintain its corporate  existence in good standing under the laws
of the jurisdiction of incorporation  and its qualification to transact business
in each jurisdiction where failure so to qualify would permanently  preclude the
Guarantor  from enforcing its rights with respect to any material asset or would
expose the Guarantor to any material liability;  provided, however, that nothing
herein  shall  prohibit the merger or  consolidation  described in clause (b) of
this Section 2.4.

         (b) The  Guarantor  will not  merge or  consolidate  or enter  into any
analogous reorganization or transaction with any Person or liquidate, wind up or
dissolve itself (or suffer any liquidation or dissolution), unless the surviving
corporation (i) assumes in writing the obligations of the Guarantor,  (ii) has a
net worth determined in accordance with GAAP) at least equal to the consolidated
net worth  (determined in accordance with GAAP) of the Guarantor as shown on the
most recent audited financial statements of the Guarantor prior to the merger or
consolidation  and (iii) the  shareholders of the Guarantor will have a majority
interest in the surviving Person.

         Section 2.5. Good Standing. The Guarantor warrants that it is and will
be during the term of this Agreement incorporated and in good standing in all
jurisdictions in which it does business.


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         Section 2.6. Indemnification Covenants.

         (A) The  Guarantor  agrees to  protect,  defend and hold  harmless  the
Authority and its officers, members,  directors,  agents, servants and employees
(each an "Indemnified  Party") from any claim,  demand,  suit or action or other
proceeding whatsoever by any person or entity whatsoever, arising or purportedly
arising from or in connection with the Guaranty or the transactions contemplated
thereby  or  actions  taken  thereunder,  except  for  any  bad  faith,  willful
misconduct  material  misrepresentation  or gross  negligence on the part of the
Indemnified Party.

         (B) All covenants,  stipulations,  promises, agreements and obligations
of  the  Authority  contained  herein  shall  be  deemed  to be  the  covenants,
stipulations,  promises,  agreements and obligations of the Authority and not of
any member, officer,  director, agent or employee of the Authority in his or her
individual  capacity,  and no recourse shall be had for the payment of any claim
based  thereon or  hereunder  against  any  member,  officer or  employee of the
Authority or any natural person executing the 1998 Bonds.

         (C) In case any  action  shall be  brought  against  one or more of the
Indemnified  Party's  based  upon  any of the  above  and in  respect  of  which
indemnity may be sought  against the  Guarantor,  such  Indemnified  Party shall
notify the Guarantor in writing,  enclosing a copy of all papers served, but the
omission so to notify the  Guarantor  of any such action shall not relieve it of
any liability which it may have to any  Indemnified  Party other than under this
Section  2.6. In case any such action shall be brought  against any  Indemnified
Party and it shall notify the  Guarantor  and the  Borrower of the  commencement
thereof,  the Guarantor  shall be entitled to  participate in and, to the extent
that it shall wish, to assume the defense  thereof with counsel  satisfactory to
such Indemnified  Party, and after notice from the Guarantor to such Indemnified
Party of the Guarantor's election so to assume the defense thereof the Guarantor
shall not be liable to such  Indemnified  Party for any legal or other expenses,
other than  reasonable  costs of  investigation  subsequently  incurred  by such
Indemnified Party in connection with the defense thereof.  The Indemnified Party
shall have the right to employ its own counsel in any such action,  but the fees
and expenses of such counsel shall be at the expense of such  Indemnified  Party
unless  (i) the  employment  of  counsel  by such  Indemnified  Party  has  been
authorized by the Guarantor,  (ii) the  Indemnified  Party shall have reasonably
concluded that there may be a conflict of interest  between the Borrower  and/or
Guarantor and the Indemnified Party in the conduct or the defense of such action
(in which case the  Guarantor  shall not have the right to direct the defense of
such action on behalf of the  Indemnified  Party),  or (iii) the Guarantor shall
not in fact have  employed  counsel  satisfactory  to the  Indemnified  Party to
assume the defense of such action.

         (D) The  Guarantor  also  agrees to pay all  reasonable  and  necessary
out-of-pocket  expenses  of  the  Authority  (including  reasonable  charges  of
counsel) in  connection  with the  Guaranty  and the  enforcement  of any rights
hereunder,  including,  without  limitation,  any  fees,  charges  and  expenses
(including reasonable charges of counsel).

         (E) The  obligations of the Guarantor  under this section shall survive
the  termination  of this  Guaranty.  This section is not for the benefit of any
person not an Indemnified  Party,  and no waiver of the Maine Tort Claims Act or
other applicable law is intended.

         Section 2.7. Submission of Financial Statements. The Guarantor shall
provide the


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Authority with a copy of its annual audited financial statements within 105 days
after the close of its Fiscal Year,  provided  however,  that if the Guarantor's
annual audited  financial  statements are incorporated  into a 10-K submitted to
the  Authority  pursuant  to  Section  2.9  hereof,  the  Guarantor  will not be
separately obligated to submit its financial statements.

         Section 2.8. Default and Litigation  Notification.  Upon becoming aware
of any condition or event which constitutes, or with the giving of notice or the
passage of time would constitute, an Event of Default, the Guarantor immediately
shall deliver to the Authority a notice stating the existence and nature thereof
and  specifying  the  corrective  steps the  Guarantor  is taking  with  respect
thereto.  The Guarantor shall promptly notify the Authority of the  commencement
of any litigation, administrative, enforcement or other proceeding by or against
it with a claim or demand of $5,000,000 or greater,  or the threat  thereof,  in
which an unfavorable  outcome could  materially  adversely  affect the financial
condition of the Guarantor.

         Section 2.9.  Notification  of SEC Filings.  The Guarantor must provide
the Authority  with copies of each filing and report made by the Guarantor  with
or to the Securities and Exchange Commission including,  without limitation, all
10-Q,  10-K and 8-K Reports (other than  registration  statements  that have not
become  effective  under the  Securities  Act of 1933,  filings and reports with
respect to dividend reinvestment, employee benefits, or other similar plans, and
filings  pertaining  to sales  of or other  transactions  in  securities  of the
Guarantor by persons other than the Guarantor),  and of each  communication from
the  Guarantor to public  shareholders  generally,  promptly  upon the filing or
making thereof.  The Guarantor must meet  periodically with the Authority at the
Authority's  reasonable request to provide  information on financial  conditions
(whether or not  included  in such  filings)  and any other issue  raised by the
Authority.  The  Authority  agrees that any  information  obtained by it and not
available  to the  public  will be kept  confidential  to the  extent  permitted
pursuant to 10 MRSA ss. 975-A and 1 MRSA ss. 401, et seq.

         Section  2.10.  Compliance  with Law.  The  Guarantor  will observe and
comply in all material respects with all material laws, regulations, ordinances,
rules, and orders (including without  limitation those relating to zoning,  land
use, environmental protection, air, water and land pollution,  wetlands, health,
equal  opportunity,   minimum  wages,   worker's   compensation  and  employment
practices) of any federal,  state, municipal or other governmental authority the
noncompliance  of which would have a material  adverse  effect on the  financial
condition of the Guarantor.

                                   ARTICLE III

                         EVENTS OF DEFAULT AND REMEDIES

         Section 3.1. Events of Default. An "Event of Default" hereunder shall
exist if any of the following occurs and is continuing:

                  (1) the Guarantor  defaults on the Obligations  referred to in
Section 2.1 hereof and such default  continues  for more than,  two (2) Business
Days after demand is made by the Trustee;

                  (2) the  Guarantor  fails to observe and perform any covenant,
condition or agreement,  other than that referred to in Sections  3.1(1) of this
Guaranty, or of any instrument,


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document or agreement  now or hereafter  securing this Guaranty and such failure
continues  for more than thirty (30) days after  written  notice (which shall be
deemed  given  upon  facsimile  transmission  or three (3)  Business  Days after
mailing of notice by first class mail,  postage  prepaid or  certified  mail) of
such  failure has been given to the  Guarantor by the Trustee or if by reason of
such default the same cannot be remedied within said thirty (30) days;

                  (3) any warranty,  representation  or other statement by or on
behalf of the Guarantor contained in this Guaranty or in any certificate, letter
or other writing or instrument  furnished or delivered to the Authority pursuant
hereto or in connection  herewith and in connection with the Financing Documents
shall at any time prove to have been  incorrect  in any  material  respect  when
made, effective, or reaffirmed, as the case may be;

                  (4) the  entry of a  decree  or order  for  relief  by a court
having  jurisdiction  of the Guarantor in an involuntary  case under the federal
bankruptcy  laws,  as now or  hereafter  constituted,  or any  other  applicable
federal or state  bankruptcy,  insolvency  or other similar law, or appointing a
receiver, liquidator,  assignee, custodian, trustee (or similar official) of the
Guarantor or for any  substantial  part of any of its property,  or ordering the
winding-up or liquidation of any of its affairs and the  continuance of any such
decree or order  unstayed  and in effect for a period of sixty (60)  consecutive
days, or the commencement by the Guarantor of a voluntary case under the federal
bankruptcy  laws,  as  now  constituted  or  hereafter  amended,  or  any  other
applicable  federal or state bankruptcy  insolvency or other similar law, or the
consent  by the  Guarantor  to the  appointment  of or  taking  possession  by a
receiver,  liquidator,  assignee, trustee, custodian (or other similar official)
or the  making by it of any  assignment  for the  benefit of  creditors,  or the
taking of corporate or other action by the  Guarantor to authorize or effect any
of the foregoing;

                  (5) A final and unappealable judgment or order for the payment
for  money in  excess  of  $1,000,000  or more  shall be  rendered  against  the
Guarantor,  such judgment or order shall continue  unsatisfied  and unpaid for a
period of thirty (30) days.

         Section 3.2.  Remedies  Upon  Default.  Upon an Event of Default  under
Section  3.1 of this  Guaranty,  the  Trustee  shall  have the right to  proceed
directly  against the Guarantor  without  proceeding  against or exhausting  any
other  remedies  which it may have and without  resorting to any  security  held
including, without limitation the Capital Reserve Fund.

         Section 3.3. [Reserved]

         Section 3.4.  Waiver of Notice of Non-Payment and Costs of Enforcement.
The Guarantor hereby expressly waives presentment, demand, protest and notice of
nonpayment  and further  waives notice from the Authority of its  acceptance and
reliance on this Guaranty. The Guarantor agrees to pay all costs,  disbursements
and expenses (including all reasonable attorneys' fees) which may be incurred by
the  Authority  in  enforcing or  attempting  to enforce  this  Guaranty and any
security therefor following any default on the part of the Guarantor  hereunder,
whether the same shall be enforced by suit or otherwise.

         Section 3.5. The Authority Not Coguarantor. The Guarantor hereby
acknowledges that (a) the Authority has established a Capital Reserve Fund under
the Indenture in order to provide credit


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enhancement for the 1998 Bonds;  (b) the Authority is not a coguarantor with the
Guarantor,  who shall have no right of  contribution,  indemnity or  subrogation
against the  Authority;  (c) all liability of the Guarantor  under this Guaranty
shall  continue  in full force and  effect  notwithstanding  any  payment by the
Authority  in the form of draws by the  Trustee  from the Capital  Reserve  Fund
under the Indenture or payments by Financial  Security  Assurance Inc. under the
Bond Insurance  Policy  provided to insure the 1998 Bonds or otherwise;  and (d)
all liability of the Guarantor  under this Guaranty shall continue in full force
and effect  notwithstanding the fact that the Authority may have acquired rights
against the Guarantor by assignment, subrogation or otherwise.

                                   ARTICLE IV

                                  MISCELLANEOUS

         Section 5.1. Amendment. This Guaranty may not be amended, changed,
modified, altered or terminated without the concurring written consent of the
Guarantor and the Authority.

         Section 5.2. Effective Date. The obligations of the Guarantor hereunder
shall arise absolutely and unconditionally when the Loan Note shall have been
executed by the Borrower.

         Section 5.3. Remedies Not Exclusive. No remedy herein conferred upon or
reserved  to the  Trustee is intended  to be  exclusive  of any other  available
remedy or remedies, but each and every such remedy shall be cumulative and shall
be in  addition  to every  other  remedy  given  under this  Guaranty  or now or
hereafter  existing at law or in equity.  No delay or  omission to exercise  any
right or power accruing upon any Event of Default shall impair any such right or
power or shall be construed to be a waiver in the event any provision  contained
in this Guaranty  should be breached by any party and thereafter  duly waived by
any other  party so  empowered  to act.  Such  waiver  shall be  limited  to the
particular  breach so waived  and shall not be deemed to waive any other  breach
hereunder. No waiver, amendment,  release or modification of this Guaranty shall
be  established  by  conduct,  custom  or course of  dealing,  but  solely by an
instrument in writing duly executed by the parties  thereunto duly authorized by
this Guaranty.

         Section 5.4. Notice.  Except as otherwise  provided herein, all notices
or other  communications  hereunder  shall be  sufficiently  given  and shall be
deemed given when  delivered by hand  delivery or on the third day following the
day on which  the same has been  mailed,  postage  prepaid,  by  certified  mail
addressed as follows:

         if to Guarantor:

                  KTI, Inc.
                  7000 Boulevard East
                  Guttenberg, NJ 07093
                  Attention: Martin J. Sergi, President
                  Fax: (201) 854-1771


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         if to the Trustee:

                  The Chase Manhattan Bank
                  73 Tremont Street
                  Boston, MA 02108-3913
                  Fax:

         Any party, by notice given hereunder, may designate a different address
for future notices.

         Section  5.5.  Counterparts.   This  Guaranty  constitutes  the  entire
agreement, and supersedes all prior agreements and understandings,  both written
and oral,  between the parties with respect to the subject matter hereof and may
be  executed  simultaneously  in several  counterparts,  each of which  shall be
deemed an original and all of which together  shall  constitute one and the same
instrument.

         Section 5.6.  Severability.  The invalidity or  unenforceability of any
one or more phrases, sentences, clauses, or Sections in this Guaranty contained,
shall not affect the validity or  enforceability  of the  remaining  portions of
this Guaranty, or any part thereof.

         Section 5.7.  Governing  Law.  This  Guaranty  shall be governed by and
construed in accordance  with the laws of the State of Maine.  The Guarantor and
the Trustee and their  successors or assigns agree that any action hereunder may
be brought in the Federal Courts in the State of New York.

         Section 5.8. Successors and Assigns. This Guaranty shall be binding
upon, inure to the benefit of and be enforceable by the parties hereto and their
respective successors and assigns.

         Section  5.9.  Reinstatement  of  Obligation.  The  obligations  of the
Guarantor  under this Guaranty  shall be reinstated to the extent of any payment
made by the  Borrower  which must be  returned  by reason of the  bankruptcy  or
insolvency of the Borrower or for any other reason,  subject to the  limitations
contained in this Guaranty.

         Section 5.10. Rules of Construction.

         (A) Words of the neuter gender shall be deemed and construed to include
correlative words of the feminine and masculine genders.

         (B) Unless the context shall  otherwise  indicate,  the term  Guarantor
shall include the plural as well as the singular number.

         (C) Terms used and not defined herein shall have the meanings set forth
in the  Agreement  or in  the  Indenture  to  the  extent  such  meaning  is not
incompatible with the context used herein.

         IN WITNESS  WHEREOF,  the  Guarantor  and the Trustee  have caused this
Guaranty to be executed, all as of the date first above written.


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WITNESS:                                   KTI, INC.

/s/ Suzanne VanDyk                         /s/ Martin J. Sergi
- ----------------------                     ------------------------------------
                                           By: Martin J. Sergi
                                           Its: President


                                           THE CHASE MANHATTAN BANK,
                                           as trustee,

/s/ Mary Lou Bessey                        /s/ Don Iaccheri
- ----------------------                     ------------------------------------
                                           By: Don Iaccheri
                                           Its: Authorized Signed


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