1
                                  EXHIBIT 15
                                      
                                      
                  Letter  Re Unaudited Financial Information


Board of Directors and Shareholders
OHM Corporation

We are aware of the incorporation by reference into the Registration Statements
(Form S-8 No. 33-24953 and Form S-8 No. 33-28025) of OHM Corporation of our
report dated August 10, 1995, relating to the unaudited consolidated interim
financial statements of OHM Corporation which are included in its Form 10-Q for
the quarter ended June 30, 1995.

Pursuant to Rule 436(c) of the Securities Act of 1933, our report is not a part
of the registration statement prepared or certified by accountants within the
meaning of Section 7 or 11 of the Securities Act of 1933.



                                                               Ernst & Young LLP

Columbus, Ohio
August 10, 1995