EXHIBIT 1 The undersigned agree that the Statement on Schedule 13D to which this Agreement is attached is filed on behalf of each one of them pursuant to Rule 13d-1(f)(iii). This Agreement may be executed in any number of counterparts, each of which...

 
                                                                       EXHIBIT 1

     The undersigned agree that the Statement on Schedule 13D to which this 
Agreement is attached is filed on behalf of each one of them pursuant to Rule 
13d-1(f)(iii). This Agreement may be executed in any number of counterparts, 
each of which shall be deemed to be an original and all of which shall together 
constitute one instrument.

Dated: Xxxxx 0, 0000


                                    XXXXX MANAGEMENT, INC.

                                    By:  /s/  Xxxxxxx X. Xxxx
                                         --------------------------------------
                                         Xxxxxxx X. Xxxx
                                         Senior Vice President,
                                         General Counsel and Secretary


                                    WHEELABRATOR TECHNOLOGIES INC.

                                    By:  /s/  Xxxxxx X. Xxxx
                                         --------------------------------------
                                         Xxxxxx X. Xxxx
                                         Secretary


                                    CHEMICAL WASTE MANAGEMENT, INC.
    
                                    By:  /s/  Xxxxxx X. Xxxx
                                         --------------------------------------
                                         Xxxxxx X. Xxxx
                                         Secretary


                                    RUST INTERNATIONAL INC.

                                    By:  /s/  Xxxxxxx X. Xxxx
                                         --------------------------------------
                                         Xxxxxxx X. Xxxx
                                         Vice President


                                    RUST INDUSTRIAL SERVICES INC.
    
                                    By:  /s/  Xxxx X. Xxxxx
                                         -------------------------------------- 
                                         Xxxx X. Xxxxx
                                         Vice President


                                    RUST REMEDIAL SERVICES HOLDING COMPANY INC.

                                    By:  /s/  Xxxx X. Xxxxx
                                         -------------------------------------- 
                                         Xxxx X. Xxxxx
                                         Vice President