Exhibit 99.4 PLEDGE OF CERTIFICATE OF DEPOSIT This Pledge of Certificate of Deposit is entered into effective May 20, 1997, by and between BANK ONE, TEXAS, N.A., a national banking association, 910 Travis, Houston, Texas 77002 ("Secured Party") and...Pledge of Certificate of Deposit • June 6th, 1997 • Nde Environmental Corp • Services-testing laboratories
