Exhibit 23.3


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


     As  independent  public  accountants,  we hereby  consent to the use of our
report  dated  January 24,  1997,  on the  financial  statements  of RHO Company
Incorporated, as of December 31, 1995 and December 31, 1996, and for each of the
years in the three years ended  December 31, 1996,  and to all references to our
firm included in this Registration Statement on Form S-4.


                                        /s/  Arthur Andersen LLP


Seattle, Washington
December 19, 1997