EXHIBIT 10.50d


                     SIXTH AMENDMENT TO THE CREDIT AGREEMENT

          This  Amendment  is  made  and  entered  into  as  of  the 16th day of
December, 2003, by and between WELLS FARGO BANK, NATIONAL ASSOCIATION, successor
to  First  Security  Bank ("Bank"), and AMERICAN ECOLOGY CORPORATION, a Delaware
corporation  ("Borrower").

                                 R E C I T A L S

          A.     Borrower  and Bank entered into a Credit Agreement, dated as of
August  17,  2000  (as amended, modified, or supplemented from time to time, the
"Credit  Agreement").

          B.     Borrower has asked Bank to amend the Credit Agreement to adjust
the commitment amount and extend the maturity date.

          C.     Bank  is  willing  to amend the Credit Agreement upon the terms
and conditions of this Amendment.


                                A M E N D M E N T

          NOW, THEREFORE, the parties agree as follows.

          DEFINITIONS.

          Except as specifically defined otherwise in this Amendment, all of the
terms  herein  shall have the same meaning as contained in the Credit Agreement.

          AMENDMENTS.

               AMENDMENTS TO ARTICLE 1 - DEFINITIONS.

                    THE DEFINITION OF "COMMITMENT  AMOUNT" IN SECTION 1.1 OF THE
                    ------------------------------------------------------------
CREDIT  AGREEMENT  IS  AMENDED  TO  INCREASE  THE AMOUNT TO $8,000,000 AND SHALL
--------------------------------------------------------------------------------
PROVIDE  IN  ITS  ENTIRETY  AS  FOLLOWS:
----------------------------------------

          "COMMITMENT AMOUNT" means Eight Million Dollars ($8,000,000), less the
aggregate  stated amount of all Letters of Credit then outstanding and available
for  drawing,  and  the  aggregate amount of unreimbursed drawings on Letters of
Credit.

                    THE  DEFINITION  OF  "MATURITY  DATE" IN  SECTION 1.1 OF THE
                    ------------------------------------------------------------
CREDIT  AGREEMENT  IS  AMENDED  TO  EXTEND  THE DATE TO JUNE 15, 2005, AND SHALL
--------------------------------------------------------------------------------
PROVIDE  IN  ITS  ENTIRETY  AS  FOLLOWS:
----------------------------------------

          "MATURITY  DATE"  means  June 15, 2005, or such other date as Bank and
Borrower  may  agree  upon  in  writing  from  time  to  time.


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          CONDITIONS PRECEDENT.

          As conditions  precedent  to Bank's obligation to extend the financial
accommodations  provided  for  in  this  Amendment,  Borrower  shall execute and
deliver,  or  cause to be executed and delivered, to Bank, in form and substance
satisfactory  to  Bank  and  its  counsel,  the  following:

               REVOLVING NOTE.

          The new Revolving Note required by this Amendment in substantially the
form attached as Exhibit 1, duly executed by Borrower.

               EVIDENCE OF ALL CORPORATE ACTION BY BORROWER.

               Certified copies  of  all  corporate  action  taken  by  Borrower
authorizing its execution and delivery of this Amendment and each other document
to be delivered pursuant to this Amendment and its performance of its agreements
thereunder.

               CERTIFICATES OF EXISTENCE.

               Certificates  of  good  standing  or  existence  that  Bank  may
reasonably  require  showing that Borrower is in good standing under the laws of
the  state  of  its  incorporation.

               PUBLIC RECORD SEARCHES.

               Uniform Commercial Code financing statement searches, federal and
state  income  tax  lien  searches,  judgment  or  litigation searches, or other
similar  searches  that Bank may reasonably require and in such form as Bank may
reasonably  require.

               PAYMENT OF LOAN AMENDMENT FEE.

               Payment  of  the  Loan  Amendment Fee as required by Section 4 of
this Amendment.

               ADDITIONAL DOCUMENTATION.

               Such  other  approvals,  opinions,  or  documents  as  Bank  may
reasonably request.

          LOAN AMENDMENT FEE.

          Upon  the  execution of this Amendment, Borrower shall pay Bank a loan
amendment fee of Eighteen Thousand Dollars ($18,000). The fee shall represent an
unconditional  payment  to  Bank  in consideration of Bank's agreement to extend
financial  accommodations  to  Borrower  pursuant  to  this  Amendment.

          REAFFIRMATION OF LOAN DOCUMENTS.

          Borrower  acknowledges and reaffirms all existing security agreements,
financing  statements,  and  any other documents executed in connection with the
Credit Agreement.  Borrower further acknowledges and agrees that the Obligations
shall  be  secured  by  all  collateral  to  be  granted by Borrower to secure a
proposed  term  loan  from  Bank  to  Borrower.

          BORROWER'S COVENANTS, REPRESENTATIONS, AND WARRANTIES.

          In order to induce  Bank to enter into this Amendment and to amend the
Credit  Agreement  in  the  manner  provided  herein,  Borrower acknowledges and
reaffirms  as  true, correct, and complete in all material respects on and as of
the  date  of this Amendment all covenants, representations, and warranties made
by  Borrower  in  the  Credit Agreement and the other Loan Documents to the same
extent  as  though  made  on  and as of the date of execution of this Amendment.
Borrower  represents  and warrants that the execution, delivery, and performance
by  the  Borrower  of  this  Amendment has been duly authorized by all necessary
corporate  action.  Borrower  further  represents and warrants that there are no
Events  of  Default  or  facts which constitute, or with the passage of time and


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without  change  will  constitute, an Event of Default under the Loan Documents.
Borrower  further  represents  that there has been no material adverse change in
Borrower's  business  or  financial  condition  from  that reflected in the most
recent  of  Borrower's  financial  statements  that have been delivered to Bank.
Borrower  further  represents and warrants that Borrower has no claims or causes
of action of any kind whatsoever against Bank or any of Bank's present or former
employees,  officers,  directors,  attorneys,  or  agents  of  any kind in their
capacity  as  such  (collectively, the "Released Parties") and further, that the
Released  Parties  have  performed  all  of the respective obligations under the
Credit  Agreement and other Loan Documents and have complied with all provisions
therein  set  forth.  Borrower  acknowledges that as of December 11th, 2003, the
outstanding principal balance of the Revolving Loans is $0.00, and the aggregate
stated  amount of all Letters of Credit outstanding and available for drawing is
$3,508,262.

          COURSE OF DEALING.

          No  course  of  dealing  heretofore  or hereafter between Borrower and
Bank,  or  any  failure or delay on the part of Bank in exercising any rights or
remedies under the Credit Agreement or existing by law shall operate as a waiver
of  any right or remedy of Bank with respect to said indebtedness, and no single
or  partial  exercise of any right or remedy hereunder shall operate as a waiver
or  preclusion  to the exercise of any other rights or remedies Bank may have in
regard  to  said  indebtedness.

          GOVERNING LAW.

          This Amendment is  made in the State of Idaho, which state the parties
agree  has  a  substantial  relationship  to  the  parties and to the underlying
transaction  embodied  hereby.  Accordingly, in all respects, this Amendment and
the Loan Documents and the obligations arising hereunder and thereunder shall be
governed  by,  and  construed in accordance with, the laws of the State of Idaho
applicable  to contracts made and performed in such state and any applicable law
of  the  United  States  of  America.  Each  party  hereby  unconditionally  and
irrevocably  waives, to the fullest extent permitted by law, any claim to assert
that  the  law  of  any  jurisdiction other than the State of Idaho governs this
Amendment  and  the  Loan  Documents.

          COSTS AND EXPENSES.

          Borrower  shall  pay  on  demand by Bank all Bank Expenses incurred by
Bank in connection with the preparation, execution, delivery, filing, recording,
and  administration  of  this  Amendment  or  any  of the documents contemplated
hereby,  including,  without  limitation,  the reasonable fees and out of pocket
expenses  of  counsel  for Bank with respect to this Amendment and the documents
and  transactions  contemplated  hereby.

          ENTIRE AGREEMENT.

          The Credit  Agreement  as  amended by this Amendment together with the
other  Loan  Documents  supersedes  all  prior negotiations, understandings, and
agreements  between  the  parties,  whether  oral  or  written,  and  all  such
negotiations,  understandings,  and agreements are evidenced by the terms of the
Loan  Documents.  The  Credit Agreement may not be further altered or amended in
any  manner  except  by  a  writing  signed  by  Bank  and  Borrower.

          EFFECTS OF THIS AMENDMENT.

          This  Amendment  shall  be  binding  and  deemed  effective when it is
executed  by  Borrower,  accepted  and  executed  by  Bank,  and  all conditions
precedent  set  forth in Section 3 have been fulfilled. All terms, covenants and
conditions  of  the  Credit  Agreement  that have not been modified, amended, or
otherwise  changed by this Amendment are reaffirmed and remain in full force and
effect.

          COUNTERPARTS.

          This Amendment may be executed in counterparts and may be delivered by
facsimile transmission.  Each such counterpart shall constitute an original, but
all  such  counterparts  shall  constitute  but  one  Amendment.

          IN  WITNESS  WHEREOF, Borrower  has  executed this Amendment as of the
date first written above.


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                                               BORROWER:

                                               AMERICAN ECOLOGY CORPORATION

                                               By /S/ James R. Baumgardner
                                                  ------------------------
                                                  James R. Baumgardner
                                                  Sr. Vice President and CFO




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                               GUARANTOR'S CONSENT

          Each  Guarantor  consents  to,  acknowledges, and accepts the forgoing
Amendment.  Each Guarantor affirms and ratifies its Continuing and Unconditional
Guaranty  made  by  Guarantor  for  the  benefit  of  Bank (the "Guaranty"), and
confirms that the Guaranty remains in full force and effect and binding upon the
Guarantor  without  any  setoffs,  defenses,  or  counterclaims  of  any  kind
whatsoever. Each Guarantor also acknowledges and reaffirms all existing security
agreements, financing statements, and any other documents the Guarantor executed
in  connection  with  the  Guaranty  or  the  Credit  Agreement.

          Dated as of December 16th, 2003.

                                           GRANTORS:

                                           AMERICAN ECOLOGY SERVICES CORPORATION


                                           By /S/ James R. Baumgardner
                                              James R. Baumgardner
                                              Sr. Vice President and CFO

                                           GUARANTORS:

                                           AMERICAN ECOLOGY SERVICES CORPORATION


                                           By /S/ James R. Baumgardner
                                              James R. Baumgardner
                                              Sr. Vice President and CFO

                                           AMERICAN ECOLOGY MANAGEMENT
                                           CORPORATION


                                           By /S/ James R. Baumgardner
                                              ------------------------
                                              James R. Baumgardner
                                              Vice President and Treasurer

                                           TEXAS ECOLOGISTS, INC


                                           By /S/ James R. Baumgardner
                                              ------------------------
                                              James R. Baumgardner
                                              Vice President and Treasurer




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                                           AMERICAN ECOLOGY RECYCLE CENTER, INC.


                                           By /S/ James R. Baumgardner
                                              ------------------------
                                              James R. Baumgardner
                                              Vice President and Treasurer

                                           AMERICAN ECOLOGY ENVIRONMENTAL
                                           SERVICES CORPORATION


                                           By /S/ James R. Baumgardner
                                              ------------------------
                                              James R. Baumgardner
                                              Vice President and Treasurer

                                           US ECOLOGY, INC.


                                           By /S/ James R. Baumgardner
                                              ------------------------
                                              James R. Baumgardner
                                              Vice President and Treasurer

                                           US ECOLOGY IDAHO, INC.


                                           By /S/ James R. Baumgardner
                                              ------------------------
                                              James R. Baumgardner
                                              Vice President and Treasurer


                                BANK'S ACCEPTANCE

          Accepted and effective as of the 16th day of December, 2003, in the
State of Idaho.

                                          WELLS FARGO BANK, NATIONAL ASSOCIATION

                                          By /S/ Brian W. Cook
                                             -----------------
                                             Brian W. Cook, Vice President




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                                    EXHIBIT 1

                             FORM OF REVOLVING NOTE

                                  SEE ATTACHED



                                 REVOLVING NOTE

BORROWER: AMERICAN ECOLOGY CORPORATION DECEMBER 16TH, 2003
BOISE, IDAHO

ADDRESS: 805 W. IDAHO, SUITE 200
BOISE, IDAHO 83702

PRINCIPAL AMOUNT: EIGHT MILLION DOLLARS ($8,000,000)

               FOR  VALUE  RECEIVED,  AMERICAN  ECOLOGY  CORPORATION, a Delaware
corporation  ("Borrower"),  promises  to  pay  to the order of WELLS FARGO BANK,
NATIONAL  ASSOCIATION  ("Bank")  the  total principal amount outstanding on this
note  (the  "Note")  together  with  interest thereon as stated below, in lawful
money  of  the  United  States  of  America.

               This  Note  is  executed  pursuant  to  and is the Revolving Note
referred  to  in  that  certain Credit Agreement, dated August 17, 2000, between
Borrower  and Bank (as amended, modified, or supplemented from time to time, the
"Credit  Agreement").  Capitalized terms used but not defined in this Note shall
have the same definitions as are ascribed to such terms in the Credit Agreement.
This  Note  is  governed  by  the  provisions  of  the  Credit  Agreement.

               This  Note  is  a  revolving  promissory  note  and  evidences  a
revolving line of credit not to exceed the maximum principal amount stated above
at  any one time. The amount outstanding on this Note at any specific time shall
be  the total amount advanced by Bank less the amount of principal payments made
from  time  to  time,  plus  any  interest  due  and  payable.

               Borrower agrees that any and all advances made hereunder shall be
for Borrower's benefit, whether or not said advances are deposited to Borrower's
account.  Advances  may be made at the request of those persons so identified in
the  Credit Agreement and such persons are hereby authorized to request advances
and to direct the disposition of any such advances in the manner provided in the
Credit  Agreement  until  written  notice  of  revocation  of  this authority is
received  by  Bank  from  Borrower.

               The  outstanding  unpaid balance of this Note shall bear interest
at  a fluctuating per annum rate as set forth in the Credit Agreement. This Note
shall  be  repaid  in  the  manner  set  forth  in  the  Credit  Agreement.

               This  Note  is secured, in part, by a Security Agreement covering
accounts  and  other collateral as provided therein and in the Credit Agreement.

               This  Note is made in the state of Idaho, which state the parties
agree  has  a  substantial  relationship  to  the  parties and to the underlying
transaction  embodied  hereby.  Accordingly,  in all respects, this Note and the
obligations  arising hereunder shall be governed by, and construed in accordance
with,  the laws of the state of Idaho applicable to contracts made and performed
in such state and any applicable law of the United States of America. Each party
hereby  unconditionally  and irrevocably waives, to the fullest extent permitted
by  law,  any  claim  to  assert that the law of any jurisdiction other than the
state of Idaho governs this Note. All disputes, controversies, or claims arising
out  of,  or  in  connection  with, this Note shall be litigated in any court of
competent  jurisdiction  within  the  state  of Idaho. Each party hereby accepts
jurisdiction  of  such  state  and  agrees  to  accept


REVOLOVING NOTE - 1
121103


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service of process as if it were personally served within such state. Each party
irrevocably  waives,  to the fullest extent permitted by law, any objection that
the  party  may  now or hereafter have to the jurisdiction of the courts of such
state  and any claim that any such litigation brought in any such court has been
brought  in  an  inconvenient  forum.

               Except as expressly provided in the Credit Agreement, the makers,
sureties,  guarantors  and  endorsers  of  this Note jointly and severally waive
presentment  for payment, protest, notice of protest and notice of nonpayment of
this  Note, and consent that this Note or any payment due under this Note may be
extended or renewed without demand or notice, and further consent to the release
of  any  collateral  or  part  thereof,  with  or  without  substitution.


                                           AMERICAN ECOLOGY CORPORATION


                                           By /S/ James R. Baumgardner
                                              James R. Baumgardner
                                              Sr. Vice President and CFO



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