Exhibit 23(a) Accountants' Consent JAMES M. HOLLOWAY, JR. 1420 Henderson Street Post Office Box 342 (29202) Columbia, South Carolina 29201 Telephone (803) 799-1890 Sec Practice Section of the American Institute Facsimile (803) 799-1891 of Certified Public Accountants E-Mail: jimholl@aol.com SC Association of Certified Public Accountants EXHIBIT 23(a) ACCOUNTANTS' CONSENT We consent to the inclusion in this annual report on Form 11-K to be filed on or about June 28, 2002 of our report dated June 17, 2002 on our audit of the financial statements of the Safety-Kleen Corp. 401(k) Savings Plan for the year ended December 31, 2001. Columbia, South Carolina June 27, 2002 /s/ James M. Holloway, Jr., CPA