TRC Companies 10-K 2004 FY Annual report

Exhibit 32.1

CERTIFICATION PURSUANT TOSECTION 906 OF THE SARBANES-OXLEY ACT 2002

(18 U.S.C. SECTION 1350)

In connection with the Annual Report of TRC Companies, Inc., a Delaware corporation (the “Company”), on Form 10-K for the year ended June 30, 2004 as filed with the Securities and Exchange Commission (the “Report”), I, Richard D. Ellison, Chief Executive Officer of the Company, certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350), that to my knowledge:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Richard D. Ellison

Richard D. Ellison

Chief Executive Officer

September 13, 2004

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