The material in ¡his book was prepared as an account of work sponsored by the U.S. Environmental Protection Agency. It has been subject to the Agency's review and it has been approved for publication. On this basis the Publisher assumes no responsibility nor liability for errors or any consequences arising from the use of the information contained herein.

Mention of trade names or commercial products does not constitute endorsement or recommendation for use by the Agency or the Publisher. Final determination of the suitability of any information or product for use contemplated by any user, and the manner of that use, is the sole responsibility of the user. The book is intended for information purposes only. The reader is warned that caution must always be exercised with potentially hazardous materials such as metals in sludges and wastewaters, and expert advice should be obtained before implementation of processes involving recovery of these metals.

Any information pertaining to law and regulations is provided for background only. The reader must contact the appropriate legal sources and regulatory authorities for up-to-date regulatory requirements and their interpretation and implementation.

The book is sold with the understanding thai the Publisher is not engaged in rendering legal, engineering, or other professional service. If advice or other expert assistance is required, the service of a competent professional should be sought.

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