Document:

<PAGE>

                                                                   Exhibit 10.45

                           BILL OF SALE AND ASSIGNMENT

     THIS BILL OF SALE AND ASSIGNMENT, made, executed and delivered this 10/th/
day of September, 2002 (the "Closing Date"), by Safety-Kleen Services, Inc., a
Delaware corporation (the "Company"), and the Company's Selling Subs listed on
Schedule 9.1 to the Acquisition Agreement (as defined below) (the Company and
the Selling Subs being referred to below each a "Seller", and together, the
"Sellers") to Clean Harbors, Inc., a Massachusetts corporation (the "Purchaser")
and the Purchaser's Purchasing Subs listed on the signature page to this Bill of
Sale and Assignment. Capitalized terms used herein but not defined herein shall
have the meanings ascribed to such terms in the Acquisition Agreement.

                              W I T N E S S E T H:

     WHEREAS, the Company and the Purchaser have entered into an Acquisition
Agreement, dated as of February 22, 2002, as amended to date (as so amended, the
"Acquisition Agreement"), pursuant to which the Company has agreed to sell,
assign, transfer, convey and deliver, or to cause to be sold, assigned, conveyed
or delivered, and the Purchaser and the Purchasing Subs have agreed to purchase
and accept, the Acquired Assets; and

     WHEREAS, the parties desire to carry out the intent and purpose of the
Acquisition Agreement by the Sellers' execution and delivery to the Purchaser
and the Purchasing Subs of this instrument evidencing the vesting in the
Purchaser and the Purchasing Subs of the Acquired Assets owned by the Sellers.

     NOW, THEREFORE, in consideration of the premises and of other valuable
consideration to the Company paid by the Purchaser, at or before the execution
and delivery hereof, the receipt and sufficiency of which by the Company is
hereby acknowledged, the Sellers, by this Bill of Sale and Assignment, do
convey, grant, bargain, sell, transfer, set over, assign, alien, remise,
release, deliver and confirm unto the Purchaser and the Purchasing Subs and
their successors and assigns forever, all of the Sellers' right, titles and
interests in and to the Acquired Assets (which do not include the Excluded
Assets).

     TO HAVE AND HOLD all of the Acquired Assets unto the Purchaser and the
Purchasing Subs, and their successors and assigns to its and their own use and
behoof forever, subject to the provisions of the Acquisition Agreement.

     Section 1.  Each of the Sellers hereby constitutes and appoints the
Purchaser, its successors and assigns, as such Seller's true and lawful
attorney, with full power of substitution, in such Seller's name and stead, but
on behalf and for the benefit of

                                       1

<PAGE>

the Purchaser and the Purchasing Subs, and their successors and assigns, to
demand and receive any and all of the Acquired Assets, and to give receipts and
releases for and in respect of the same, and any part thereof, and from time to
time to institute and prosecute in such Seller's name, or otherwise, for the
benefit of the Purchaser and the Purchasing Subs, and their successors and
assigns, any and all proceedings at law, in equity or otherwise, which the
Purchaser, its successors or assigns, may deem proper for the collection or
reduction to possession of any of the Acquired Assets or for the collection and
enforcement of any claim or right of any kind hereby sold, conveyed, transferred
or assigned, or intended so to be, and to do all acts and things in relation to
the Acquired Assets which the Purchaser and the Purchasing Subs, and their
successors or assigns shall deem desirable, each of the Sellers hereby declaring
that the foregoing powers are coupled with an interest and are and shall be
irrevocable by such Seller or by its dissolution or in any other manner or for
any reason whatsoever.

     Section 2.  Each of the Sellers hereby covenants that, from time to time
after the delivery of this instrument, at the Purchaser's request and without
further consideration, the Sellers will do, execute, acknowledge, and deliver,
or will cause to be done, executed, acknowledged and delivered, all and every
such further acts, deeds, conveyances, transfers, assignments, powers of
attorney and assurances as reasonably may be required more effectively to
convey, transfer to and vest in the Purchaser and the Purchasing Subs any of the
Acquired Assets.

     Section 3.  Nothing in this instrument, express or implied, is intended or
shall be construed to confer upon, or give to, any Person other than the
Purchaser and the Purchasing Subs, and their successors and assigns, any remedy
or claim under or by reason of this instrument or any terms, covenants or
condition hereof, and all terms, covenants and conditions, promises and
agreements contained in this instrument shall be for the sole and exclusive
benefit of the Purchaser and the Purchasing Subs, and their successors and
assigns.

     Section 4.  This instrument shall be binding upon the Sellers, the
Purchaser and the Purchasing Subs, and their respective successors and assigns,
effective immediately upon its delivery to the Purchaser.

     Section 5.  Nothing contained in this Bill of Sale and Assignment shall in
any way supersede, modify, replace, amend, change rescind, expand, exceed or
enlarge or in any way affect the provisions, including the warranties,
covenants, agreements, conditions, or in general, any rights and remedies, and
any of the obligations of the Company or the Purchaser set forth in the
Acquisition Agreement.

     Section 6.  This Bill of Sale and Assignment shall be governed by and
construed in accordance with the Laws of the State of Delaware without regard to
the

                                       2

<PAGE>

rules of conflict of laws of the State of Delaware or any other jurisdiction.
Until confirmation of the Bankruptcy Plan, the Purchaser, the Purchasing Subs
and the Sellers irrevocably and unconditionally consent to submit to the
jurisdiction of the Bankruptcy Court for any litigation arising out of or
relating to this Bill of Sale and Assignment and the transactions contemplated
hereby (and agree not to commence any litigation relating thereto except in the
Bankruptcy Court).

     Section 7.  No amendment or modification of this Bill of Sale and
Assignment shall be effective unless it is set forth in writing and signed by
each of the parties hereto.

     Section 8.  This Bill of Sale and Assignment may be executed in
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same original.

                                    ********

                                       3

<PAGE>

     IN WITNESS WHEREOF, each of the Sellers, the Purchaser and the Purchasing
Subs have caused this Bill of Sale and Assignment to be signed by their
respective duly authorized officers as of the date set forth above.

                                  SAFETY-KLEEN SERVICES, INC.

                                  By: /s/ D. M. Sprinkle
                                      ----------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                  SELLING SUBS:

                                  SAFETY-KLEEN (CONSULTING), INC.

                                  By: /s/ Larry W. Singleton
                                      ----------------------------------
                                      Name:  Larry W. Singleton
                                      Title: President

                                  SAFETY-KLEEN (LONE AND GRASSY MOUNTAIN), INC.

                                  By: /s/ D. M. Sprinkle
                                      ----------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                  SAFETY-KLEEN (TULSA), INC.

                                  By: /s/ D. M. Sprinkle
                                      ----------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                       4

<PAGE>

                             SAFETY-KLEEN (SAN ANTONIO), INC.

                             By: /s/ D. M. Sprinkle
                                 ----------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                             SAFETY-KLEEN (WICHITA), INC.

                             By: /s/ D. M. Sprinkle
                                 ----------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                             SAFETY-KLEEN (DELAWARE), INC.

                             By: /s/ Larry W. Singleton
                                 ----------------------------------------
                                 Name:  Larry W. Singleton
                                 Title: President

                             SK SERVICES (EAST), L.C.

                             By: /s/ Larry W. Singleton
                                 ----------------------------------------
                             Safety-Kleen (Delaware, Inc.), its Sole Shareholder
                                 Name:  Larry W. Singleton
                                 Title: President of Sole Shareholder

                                       5

<PAGE>

                                  SK SERVICES, L.C.

                                  By: /s/ Larry W. Singleton
                                      ------------------------------------
                                  Safety-Kleen (Delaware), Inc.,
                                  Its Sole Shareholder
                                      Name:  Larry W. Singleton
                                      Title: President of Sole Shareholder

                                  SAFETY-KLEEN (ROSEMOUNT), INC.

                                  By: /s/ Larry W. Singleton
                                      ------------------------------------
                                      Name:  Larry W. Singleton
                                      Title: President

                                  SAFETY-KLEEN (SAWYER), INC.

                                  By: /s/ Larry W. Singleton
                                      ------------------------------------
                                      Name:  Larry W. Singleton
                                      Title: President

                                  SAFETY-KLEEN (PPM), INC.

                                  By: /s/ D. M. Sprinkle
                                      ------------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                  NINTH STREET PROPERTIES, INC.

                                  By: /s/ Larry W. Singleton
                                      ------------------------------------
                                      Name:  Larry W. Singleton
                                      Title: President

                                        6

<PAGE>

                                  SAFETY-KLEEN (SAN JOSE), INC.

                                  By: /s/ D. M. Sprinkle
                                      ------------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                  CHEMCLEAR, INC. OF LOS ANGELES

                                  By: /s/ D. M. Sprinkle
                                      ------------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                  USPCI, INC. OF GEORGIA

                                  By: /s/ Larry W. Singleton
                                      ------------------------------------
                                      Name:  Larry W. Singleton
                                      Title: President

                                  SAFETY-KLEEN HOLDINGS, INC.

                                  By: /s/ Larry W. Singleton
                                      ------------------------------------
                                      Name:  Larry W. Singleton
                                      Title: President

                                  SAFETY-KLEEN (WESTMORLAND), INC.

                                  By: /s/ D. M. Sprinkle
                                      ------------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                        7

<PAGE>

                                  SAFETY-KLEEN (BUTTONWILLOW), INC.

                                  By: /s/ D. M. Sprinkle
                                      ----------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                  SAFETY-KLEEN (NE), INC.

                                  By: /s/ David M. Sprinkle
                                      ----------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                  SAFETY-KLEEN (CROWLEY), INC.

                                  By: /s/ D. M. Sprinkle
                                      ----------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                  SAFETY-KLEEN (LAPORTE), INC.

                                  By: /s/ D. M. Sprinkle
                                      ----------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                  SAFETY-KLEEN (TG), INC.

                                  By: /s/ D. M. Sprinkle
                                      ----------------------------------
                                      Name:  David M. Sprinkle
                                      Title: President

                                        8

<PAGE>

                                    SAFETY-KLEEN (ROEBUCK), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (TS), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (COLFAX), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    GSX CHEMICAL SERVICES OF OHIO, INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    LEMC, INC.

                                    By: /s/ Larry W. Singleton
                                        ----------------------------------------
                                        Name:  Larry W. Singleton
                                        Title: President

                                        9

<PAGE>

                                    SAFETY-KLEEN CHEMICAL SERVICES, INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (ALTAIR), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (FS), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (BDT), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name: David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (GS), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                       10

<PAGE>

                                    SAFETY-KLEEN (CLIVE), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (WT), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN OSCO HOLDINGS, INC.

                                    By: /s/ Larry W. Singleton
                                        ----------------------------------------
                                        Name:  Larry W. Singleton
                                        Title: President

                                    SAFETY-KLEEN (NASHVILLE), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                       11

<PAGE>

                                    SAFETY-KLEEN (BARTOW), INC.

                                    By: /s/ D. M Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (CALIFORNIA), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (CHATTANOOGA), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (PECATONICA), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (WHITE CASTLE), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                       12

<PAGE>

                                    SAFETY-KLEEN (PUERTO RICO), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (BRIDGEPORT), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (DEER PARK), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (BATON ROUGE), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (PLAQUEMINE), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                       13

<PAGE>

                                    SAFETY-KLEEN (CUSTOM TRANSPORT), INC.

                                    By: /s/ Larry W. Singleton
                                        ----------------------------------------
                                        Name:  Larry W. Singleton
                                        Title: President

                                    SAFETY-KLEEN (LOS ANGELES), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (TIPTON), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (GLOUCESTER), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  D. M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (DEER TRAIL), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                       14

<PAGE>

                                    SAFETY-KLEEN (MT. PLEASANT), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (MINNEAPOLIS), INC.

                                    By: /s/ Larry W. Singleton
                                        ----------------------------------------
                                        Name:  Larry W. Singleton
                                        Title: President

                                    SAFETY-KLEEN (ARAGONITE), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (SUSSEX), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                    SAFETY-KLEEN (ENCOTEC), INC.

                                    By: /s/ D. M. Sprinkle
                                        ----------------------------------------
                                        Name:  David M. Sprinkle
                                        Title: President

                                       15

<PAGE>

                                         CLEAN HARBORS, INC.

                                         By: /s/ Alan McKim
                                            -----------------------------------
                                            Name:  Alan McKim
                                            Title: President

                                         PURCHASING SUBS:

                                         Altair Disposal Services, LLC
                                         Baton Rouge Disposal, LLC
                                         Bridgeport Disposal, LLC
                                         Clean Harbors Andover, LLC
                                         Clean Harbors Antioch, LLC
                                         Clean Harbors Aragonite, LLC
                                         Clean Harbors Arizona, LLC
                                         Clean Harbors Baton Rouge, LLC
                                         Clean Harbors BDT, LLC
                                         Clean Harbors Buttonwillow, LLC
                                         Clean Harbors Chattanooga, LLC
                                         Clean Harbors Chemical Sales, LLC
                                         Clean Harbors Coffeyville, LLC
                                         Clean Harbors Colfax, LLC
                                         Clean Harbors Deer Park, L.P.
                                         Clean Harbors Deer Trail, LLC
                                         Clean Harbors Florida, LLC
                                         Clean Harbors Grassy Mountain, LLC
                                         Clean Harbors Kansas, LLC
                                         Clean Harbors LaPorte, L.P.
                                         Clean Harbors Laurel, LLC
                                         Clean Harbors Lone Mountain, LLC
                                         Clean Harbors Los Angeles, LLC
                                         Clean Harbors of Texas, LLC

                                       16

<PAGE>

                                          Clean Harbors Pecatonica, LLC
                                          Clean Harbors Plaquemine, LLC
                                          Clean Harbors PPM, LLC
                                          Clean Harbors Reidsville, LLC
                                          Clean Harbors San Jose, LLC
                                          Clean Harbors Tennessee, LLC
                                          Clean Harbors Westmorland, LLC
                                          Clean Harbors White Castle, LLC
                                          Crowley Disposal, LLC
                                          Disposal Properties, LLC
                                          GSX Disposal, LLC
                                          Harbor Industrial Services Texas, L.P.
                                          Hilliard Disposal, LLC
                                          Roebuck Disposal, LLC
                                          Sawyer Disposal Services, LLC
                                          Tulsa Disposal, LLC
                                          Northeast Casualty Real Property, LLC

                                          By: /s/ Alan McKim
                                              ----------------------------------
                                             Name:  Alan McKim
                                             Title: President

 [Bill of Sale]

                                       17<PAGE>

                                                                   Exhibit 10.46

                              ASSUMPTION AGREEMENT

         THIS ASSUMPTION AGREEMENT made as of September 10, 2002 by Clean
Harbors, Inc., a Massachusetts corporation ("Obligor"), in favor of Safety-Kleen
Services, Inc., a Delaware corporation (the "Company"), and the Company's
Selling Subs listed on Schedule 9.1 to the Acquisition Agreement (as defined
below) (the Company and the Selling Subs being collectively referred to
hereafter as the "Sellers"). Capitalized terms used herein but not defined
herein shall have the meanings ascribed to such terms in the Acquisition
Agreement.

                              W I T N E S S E T H:

         WHEREAS, Obligor and the Company are parties to an Acquisition
Agreement, dated as of February 22, 2002, as amended to date (as so amended, the
"Acquisition Agreement"), relating to the sale of certain assets by the Sellers
to Obligor. The Obligor has agreed to assume from the Sellers and their
Affiliates the Assumed Liabilities as set forth in the Acquisition Agreement;
and

         WHEREAS, the parties desire to carry out the intent and purpose of the
Agreements by Obligor's execution and delivery to the Sellers of this instrument
evidencing the assumption of certain liabilities and obligations of the Sellers.

         NOW, THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

         Section 1. As of the date hereof, Obligor, pursuant to Section 1.3 of
the Acquisition Agreement, hereby covenants and agrees to assume and thereafter
pay, perform or otherwise discharge the Assumed Liabilities, in accordance with
their terms, as set forth in Section 1.3 of the Acquisition Agreement.

         Section 2. Obligor hereby covenants that from time to time after
delivery of this Assumption Agreement at the request of the Sellers and without
further cost or expense to the Sellers, unless otherwise provided in the
Acquisition Agreement, Obligor will execute and deliver such other instruments
which the Sellers may reasonably request in order to more effectively consummate
the assumption of the Assumed Liabilities contemplated by the Acquisition
Agreement.

         Section 3. Nothing in this instrument, express or implied, is intended
or shall be construed to confer upon, or give to, any person, firm or
corporation, other than the Sellers and their successors and assigns, any remedy
or claim under or by reason of

                                       1

<PAGE>

this instrument or any terms, covenants or condition hereof, and all the terms,
covenants and conditions, promises and agreements in this instrument shall be
for the sole and exclusive benefit of the Sellers and their successors and
assigns.

         Section 4. Notwithstanding anything to the contrary contained herein or
in the Acquisition Agreement, the assumption by Obligor of the Assumed
Liabilities as set forth above shall not be construed to defeat, impair or limit
in any way (i) any rights or remedies of Obligor against third parties to
contest or dispute the validity or amount of any of such Assumed Liabilities or
(ii) any other rights or remedies of the Obligor under the Acquisition
Agreement.

         Section 5. Nothing contained herein shall release the Company or
Obligor from any of its duties or obligations under the Acquisition Agreement or
in any way diminish, limit or modify any of the representations, warranties,
covenants or agreements set forth in the Acquisition Agreement.

         Section 6. This Assumption Agreement shall be governed by and construed
in accordance with the laws of the State of Delaware without regard to the rules
of conflict of laws of the Sate of Delaware or any other jurisdiction. Until
confirmation of the Bankruptcy Plan, Obligor and the Sellers irrevocably and
unconditionally consent to submit to the jurisdiction of the Bankruptcy Court
for any litigation arising out of or relating to this Assumption Agreement and
the transactions contemplated hereby (and agree not to commence any litigation
relating thereto except in the Bankruptcy Court).

         Section 7. This Assumption Agreement shall be binding upon and inure to
the benefit of the parties hereto and their respective successors and assigns.

         Section 8. This Assumption Agreement may be executed in counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one and the same original.

                                    ********

                                       2

<PAGE>

         IN WITNESS WHEREOF, this Assumption Agreement has been duly executed
and delivered by the duly respective authorized officers of each of Obligor and
the Sellers as of the date first above written.

                                CLEAN HARBORS, INC.

                                By: /s/ Alan McKim
                                   ---------------------------------------------
                                   Name:  Alan McKim
                                   Title: President

                                SAFETY-KLEEN SERVICES, INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SELLING SUBS:

                                SAFETY-KLEEN (CONSULTING), INC.

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Name:  Larry W. Singleton
                                   Title: President

                                SAFETY-KLEEN (LONE AND GRASSY MOUNTAIN), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                       3

<PAGE>

                                SAFETY-KLEEN (TULSA), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (SAN ANTONIO), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (WICHITA), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (DELAWARE), INC.

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Name:  Larry W. Singleton
                                   Title: President of Sole Shareholder

                                       4

<PAGE>

                                SK SERVICES (EAST), L.C.

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Safety-Kleen (Delaware), Inc.,
                                   its Sole Shareholder
                                   Name:  Larry W. Singleton
                                   Title: President of Sole Shareholder

                                SK SERVICES, L.C.

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Safety-Kleen (Delaware), Inc.,
                                   its Sole Shareholder
                                   Name:  Larry W. Singleton
                                   Title: President of Sole Shareholder

                                SAFETY-KLEEN (ROSEMOUNT), INC.

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Name:  Larry W. Singleton
                                   Title: President

                                SAFETY-KLEEN (SAWYER), INC.

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Name:  Larry W. Singleton
                                   Title: President

                                SAFETY-KLEEN (PPM), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                       5

<PAGE>

                                NINTH STREET PROPERTIES, INC.

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Name:  Larry W. Singleton
                                   Title: President

                                SAFETY-KLEEN (SAN JOSE), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                CHEMCLEAR, INC. OF LOS ANGELES

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                USPCI, INC. OF GEORGIA

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Name:  Larry W. Singleton
                                   Title: President

                                SAFETY-KLEEN HOLDINGS, INC.

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Name:  Larry W. Singleton
                                   Title: President

                                       6

<PAGE>

                                SAFETY-KLEEN (WESTMORLAND), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (BUTTONWILLOW), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (NE), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (CROWLEY), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (LAPORTE), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                       7

<PAGE>

                                SAFETY-KLEEN (TG), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (ROEBUCK), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (TS), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (COLFAX), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                GSX CHEMICAL SERVICES OF OHIO, INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                       8

<PAGE>

                                LEMC, INC.

                                By: /s/ Larry W. Singleton
                                   ---------------------------------------------
                                   Name:  Larry W. Singleton
                                   Title: President

                                SAFETY-KLEEN CHEMICAL SERVICES, INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (ALTAIR), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (FS), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                SAFETY-KLEEN (BDT), INC.

                                By: /s/ D. M. Sprinkle
                                   ---------------------------------------------
                                   Name:  David M. Sprinkle
                                   Title: President

                                       9

<PAGE>

                              SAFETY-KLEEN (GS), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (CLIVE), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (WT), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN OSCO HOLDINGS, INC.

                              By: /s/ Larry W. Singleton
                                 -----------------------------------------------
                                 Name:  Larry W. Singleton
                                 Title: President

                              SAFETY-KLEEN (NASHVILLE), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                                       10

<PAGE>

                              SAFETY-KLEEN (BARTOW), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                               SAFETY-KLEEN (CALIFORNIA), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN  (CHATTANOOGA), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (PECATONICA), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                                       11

<PAGE>

                              SAFETY-KLEEN (WHITE CASTLE), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (PUERTO RICO), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (BRIDGEPORT), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (DEER PARK), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (BATON ROUGE), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                                       12

<PAGE>

                              SAFETY-KLEEN (PLAQUEMINE), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (CUSTOM TRANSPORT), INC.

                              By: /s/ Larry W. Singleton
                                 -----------------------------------------------
                                 Name:  Larry W. Singleton
                                 Title: President

                              SAFETY-KLEEN (LOS ANGELES), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (TIPTON), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (GLOUCESTER), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                                       13

<PAGE>

                              SAFETY-KLEEN (DEER TRAIL), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (MT. PLEASANT), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (MINNEAPOLIS), INC.

                              By: /s/ Larry W. Singleton
                                 -----------------------------------------------
                                 Name:  Larry W. Singleton
                                 Title: President

                              SAFETY-KLEEN (ARAGONITE), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                              SAFETY-KLEEN (SUSSEX), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

                                       14

<PAGE>

                              SAFETY-KLEEN (ENCOTEC), INC.

                              By: /s/ D. M. Sprinkle
                                 -----------------------------------------------
                                 Name:  David M. Sprinkle
                                 Title: President

[Assumption Agreement]

                                       15

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