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                                                                   EXHIBIT 23(a)



                        CONSENT OF INDEPENDENT AUDITORS



We consent to the incorporation by reference in the Registration Statement on
Form S-8 pertaining to the OHM Corporation Directors' Deferred Fee Plan of our
reports dated February 1, 1995, with respect to the consolidated financial
statements of OHM Corporation incorporated by reference in its Annual Report
(Form 10-K) for the year ended December 31, 1994 and the related financial
statement schedules included therein, filed with the Securities and Exchange
Commission.



                                                ERNST & YOUNG LLP


Columbus, Ohio
September 29, 1995