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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 Retirement and Incentive Compensation
Plan of our report dated February 13, 1996, except for Notes 2 and 10, as to
which the date is March 25, 1996, with respect to the consolidated financial
statements and financial statement schedule of OHM Corporation included in its
Annual Report (Form 10-K) for the year ended December 31, 1995, filed with the
Securities and Exchange Commission.

                                     ERNST & YOUNG LLP
                                     /s/ Ernst & Young LLP

Columbus, Ohio
January 31, 1997

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