EXHIBIT 5 COMPANY VOTING AGREEMENT COMPANY VOTING AGREEMENT (this "Agreement"), dated as of January 15, 1998, among International Technology Corporation, a Delaware corporation ("Parent"), OHM Corporation, an Ohio corporation (the "Company") and the undersigned shareholders of the Company (the "Shareholders"). WHEREAS, concurrently with the execution of this Agreement, the Company, Parent and IT-Ohio, Inc., an Ohio Corporation and a wholly owned subsidiary of Parent ("Merger Sub"), have entered into an Agreement and Plan of Merger (as it may be hereafter amended from time to time, the "Merger Agreement"), which provides that Merger Sub shall make a tender offer (the "Offer") for 13,933,000 shares of common stock of the Company and that Merger Sub shall thereafter merge (the "Merger") with and into the Company pursuant to the terms and conditions of the Merger Agreement, and sets forth certain representations, warranties, covenants and agreements of the parties thereto in connection with the Offer, the Merger and the other transactions contemplated therein (the "Merger Transactions"); and WHEREAS, the Shareholders are the record holders of shares of Common Stock, par value $0.10 per share ("Company Common Stock"), of the Company; and WHEREAS, in order to induce the Company, Parent and Merger Sub to enter into the Merger Agreement, the Shareholders wish to agree (i) to vote the shares of Company Common Stock and any other shares of capital stock of the Company held by them so as to facilitate the consummation of the Merger Transactions, (ii) except as provided in this Agreement, not to transfer or otherwise dispose of any of the shares of Company Common Stock or any other shares of capital stock held by them, or any other shares of capital stock of the Company acquired by them hereafter and prior to the Effective Time (as defined in the Merger Agreement), and (iii) to deliver to Parent an irrevocable proxy to vote the shares of Company Common Stock and any other shares of capital stock held by them, and any other shares of capital stock of the Company acquired by them hereafter and prior to the Effective Time. NOW, THEREFORE, for good and valuable considera tion, the receipt, sufficiency and adequacy of which is hereby acknowledged, the parties hereto agree as follows: 1. Representations of Shareholders. Each of the Shareholders ------------------------------- represents and warrants to the Company, Parent and Merger Sub that (a) such Shareholder lawfully owns beneficially (as such term is defined in the Securities Exchange Act of 1934, as amended (the "1934 Act")), and of record the number of shares of Company Common Stock set forth opposite such Shareholder's name on Exhibit A (such Shareholder's "Shares") free and clear of all liens, claims, charges, security interests or other encumbrances and, except for this Agreement and the Merger Agreement, there are no options (other than options described in the Company Disclosure Letter or annexes thereto), warrants or other rights, agreements, arrangements or commitments of any character to which such Shareholder is a party relating to the pledge, disposition or voting of any shares of capital stock of the Company (other than, with respect to Mr. James L. Kirk, a pledge of his Shares made in connection with a loan financing the acquisition of real property) and there are no voting trusts or voting agreements with respect to such Shares, (b) such Shareholder does not beneficially own any shares of Company Common Stock or any other shares of capital stock of the Company other than such Shares and, except for such Shares, does not have any options, warrants or other rights to acquire any additional shares of capital stock of the Company or any security exercisable for or convertible into shares of capital stock of the Company, (c) such Shareholder has full power and authority to enter into, execute and deliver this Agreement and to perform fully such Shareholder's obligations hereunder, and (d) this Agreement has been duly executed and delivered by such Shareholder, constitutes the legal, valid and binding obligation of such Shareholder, and is enforceable against such Shareholder in accordance with its terms. 2. Agreement to Vote Shares. Each of the Shareholders agrees that ------------------------ during the term of this Agreement it will vote such Shareholder's Shares and any New Shares (as defined in Section 6 hereof), and will cause any holder of record of such Shares or New Shares to vote such Shareholder's Shares and New Shares: (a) in favor of adoption of the Merger Agreement and in favor of consummation of the Merger Transactions at every meeting of the shareholders of the Company at which such matters are considered and at every adjournment thereof and in connection with any written consent of the shareholders of the Company, (b) in favor of the election to the Company's Board of Directors of such number of Parent Representatives as Parent is permitted to cause to be elected to the Company's Board of Directors pursuant to Section 1.4 of the Merger Agreement, (c) against any action or agreement that would compete with, impede, interfere with or attempt to discourage the Merger Transactions, or inhibit the timely consummation of the Merger Transactions, (d) against any action or agreement that would result in a breach in any material respect of any covenant, representation or warranty or -2- any other obligation of the Company under the Merger Agreement and (e) against any merger, consolidation, business combination, reorganization, recapitalization, liquidation or sale or transfer of any material assets of the Company or its subsidiaries that could compete with, impede, interfere with or attempt to discourage the Merger Transactions or inhibit the timely consummation of the Merger Transactions. Each Shareholder agrees to deliver to Parent upon request a proxy substantially in the form attached hereto as Exhibit B, which proxy shall be irrevocable during the term of this Agreement to the fullest extent permitted under Delaware law. 3. No Voting Trusts. Each of the Shareholders agrees that they will ---------------- not, nor will they permit any entity under their control to, deposit any of their Shares or any New Shares held by them in a voting trust or subject any of their Shares or any New Shares held by them to any arrangement with respect to the voting of such Shares or New Shares that could result in a shareholder's vote or action by consent of the shareholders of the Company in opposition to or in competition with the consummation of the Merger Transactions. 4. No Proxy Solicitations. Each of the Shareholders agrees that ---------------------- such Shareholder will not, nor will such Shareholder permit any entity under such Shareholder's control to, (a) solicit proxies or become a "participant" in a "solicitation" (as such terms are defined in Regulation 14A under the 1934 Act) in opposition to or competition with the consummation of the Merger Transactions or otherwise encourage or assist any party in taking or planning any action which would compete with, impede, interfere with or attempt to discourage the Merger Transactions or inhibit the timely consummation of the Merger Transactions, (b) directly or indirectly encourage, initiate or cooperate in a shareholders' vote or action by consent of Parent's shareholders in opposition to or in competition with the consummation of the Merger Transactions, or (c) become a member of a "group" (as such term is used in Section 13(d) of the 1934 Act) with respect to any voting securities of Parent for the purpose of opposing or competing with the consummation of the Merger Transactions. 5. Transfer and Encumbrance. On or after the date hereof and during ------------------------ the term of this Agreement, each of the Shareholders agrees not to transfer, sell, offer, exchange, pledge or otherwise dispose of or encumber any of such Shareholder's Shares or New Shares, except for tenders of such Shares into the Offer, unless the transferee agrees in written form satisfactory to Parent to be bound by the terms of this Agreement. 6. Additional Purchases. Each of the Shareholders agrees that such -------------------- Shareholder will not purchase or otherwise -3- acquire beneficial ownership of any shares of Company Common Stock or any other capital stock of the Company after the execution of this Agreement ("New Shares"), nor will any Shareholder voluntarily acquire the right to vote or share in the voting of any shares of Company Common Stock or any other capital stock of the Company other than the Shares, unless such Shareholder agrees to deliver to Parent immediately after such purchase or acquisition an irrevocable proxy in the form attached hereto as Exhibit B with respect to such shares. Each of the Shareholders also severally agrees that any New Shares acquired or purchased by such Shareholder shall be subject to the terms of this Agreement to the same extent as if they constituted Shares. 7. Specific Performance. Each party hereto acknowledges that it -------------------- will be impossible to measure in money the damage to the other party if a party hereto fails to comply with any of the obligations imposed by this Agreement, that every such obligation is material and that, in the event of any such failure, the other party will not have an adequate remedy at law or damages. Accordingly, each party hereto agrees that injunctive relief or other equitable remedy, in addition to remedies at law or damages, is the appropriate remedy for any such failure and will not oppose the granting of such relief on the basis that the other party has an adequate remedy at law. Each party hereto agrees that it will not seek, and agrees to waive any requirement for, the securing or posting of a bond in connection with any other party's seeking or obtaining such equitable relief. 8. Entire Agreement. This Agreement supersedes all prior ---------------- agreements, written or oral, among the parties hereto with respect to the subject matter hereof and contains the entire agreement among the parties with respect to the subject matter hereof. This Agreement may not be amended, supplemented or modified, and no provisions hereof may be modified or waived, except by an instrument in writing signed by all the parties hereto. No waiver of any provisions hereof by any party shall be deemed a waiver of any other provisions hereof by any such party, nor shall any such waiver be deemed a continuing waiver of any provision hereof by such party. 9. Notices. Any notice, request, instruction or other document to ------- be given hereunder by any party to the others shall be in writing and delivered personally or sent by registered or certified mail, postage prepaid, or by facsimile: if to any Shareholder: --------------------- to the address listed on Exhibit A hereto. -4- if to the Company: ----------------- Steven E. Harbour OHM Corporation 5445 Triangle Parkway, Suite 400 Norcross, Georgia 30092 Telecopier: (770) 849-3110 with a copy to: Joseph B. Frumkin Sullivan & Cromwell 125 Broad Street New York, New York 10004 Telecopier: (212) 558-3588 and a copy to: Thomas C. Daniels Jones Day Reavis & Pogue North Point 901 Lakeside Avenue Cleveland, Ohio 44114 Telecopier: (216) 579-0212 if to Parent or Merger Sub: -------------------------- James G. Kirk International Technology Corporation 2790 Mosside Boulevard Monroeville, PA 15146-2792 Telecopier: (412) 858-3978 with a copy to: Peter F. Ziegler Gibson, Dunn & Crutcher LLP 333 South Grand Avenue Los Angeles, California 90071 Telecopier: (213) 229-7520 or to such other persons or addresses as may be designated in writing by the party to receive such notice as provided above. 10. Miscellaneous. ------------- (a) This Agreement shall be deemed a contract made under, and for all purposes shall be construed in accordance with, the laws of the State of Delaware applicable to agreements executed in and solely to be performed within such state. -5- (b) If any provision of this Agreement or the application of such provision to any person or circumstances shall be held invalid or unenforceable by a court of competent jurisdiction, such provision or application shall be unenforceable only to the extent of such invalidity or unenforceability and the remainder of the provision held invalid or unenforceable and the application of such provision to persons or circumstances, other than the party as to which it is held invalid, and the remainder of this Agreement, shall not be affected. (c) This Agreement may be executed in one or more counterparts, each of which shall be deemed to be an original but all of which together shall constitute one and the same instrument. (d) This Agreement shall terminate automatically upon the termination of the Merger Agreement or upon the Effective Time of the Merger. This Agreement shall not otherwise be terminable. (e) Each party hereto shall execute and deliver such additional documents as may be necessary or desirable to effect the transactions contemplated by this Agreement. (f) All Section headings herein are for convenience of reference only and are not part of this Agreement, and no construction or reference shall be derived therefrom. (g) The obligations of the Shareholders set forth in this Agreement shall not be effective or binding upon any Shareholder until after such time as the Merger Agreement is executed and delivered by the Company, Parent and Merger Sub, and the parties agree that there is not and has not been any other agreement, arrangement or understanding between the parties hereto with respect to the matters set forth herein. -6- IN WITNESS WHEREOF, the parties hereto have executed and delivered this Agreement as of the date first written above. OHM CORPORATION By: ----------------------------- Name: Title: ----------------------------- (Shareholder) ----------------------------- (Shareholder) ----------------------------- (Shareholder) ----------------------------- (Shareholder) INTERNATIONAL TECHNOLOGY CORPORATION By: ----------------------------- Name: Title: (EXHIBIT A) Name and Address of Shareholder Number of Shares ------------------- ---------------- H. Wayne Huizenga 1,000,000 Huizenga Holdings 450 E. Las Olas Boulevard Ft. Lauderdale, FL 33301 Huizenga Family Foundation, Inc. 500,000 450 E. Las Olas Boulevard Ft. Lauderdale, FL 33301 James L. Kirk 1,223,716 OHM Corporation 16406 U.S. Rt. 224 East Findlay, OH 45840 Joseph R. Kirk 2,088,060 OHM Corporation 16406 U.S. Rt. 224 East Findlay, OH 45840 (EXHIBIT B) FORM OF PROXY The undersigned, for consideration received, hereby appoints Anthony J. Deluca and James G. Kirk and each of them my proxies, with power of substitution and resubstitution, to vote all shares of Common Stock, par value $0.10 per share, of OHM Corporation, an Ohio corporation (the "Company"), [and [insert any other Shares (as defined in the Voting Agreement) owned by Shareholder]] owned by the undersigned at the Special Meeting of Shareholders of the Company to be held [insert date, time and place] and at any adjournment thereof IN FAVOR OF adoption of the Agreement and Plan of Merger, dated as of January 15, 1998 (the "Merger Agreement"), among the Company, International Technology Corporation ("Parent") and IT-Ohio, Inc., IN FAVOR OF consummation of the Merger Transactions, IN FAVOR OF [List such number of Parent Representatives (as defined in Section 1.4 of the Merger Agreement) as Parent is permitted to cause to be elected to the Company's Board of Directors pursuant to Section 1.4 of the Merger Agreement], and AGAINST [insert description of any action or agreement that would compete with, impede, interfere with or attempt to discourage the Merger Transactions or inhibit the timely consummation of the Merger Transactions or any action or agreement that would result in a breach in any material respect of any covenant, representation or warranty or any other obligation of the Company under the Merger Agreement or any merger, consolidation, business combination, reorganization, recapitalization, liquidation or sale or transfer of any material assets of the Company or its subsidiaries]. This proxy is coupled with an interest, revokes all prior proxies granted by the undersigned and is irrevocable until such time as the Voting Agreement, dated as of January 15, 1998 among certain shareholders of the Company, including the undersigned, Parent, and the Company terminates in accordance with its terms. Dated ______, 1998 ___________________________ (Shareholder)