ording, or in any information storage or retrieval system, without written permission from the publishers. Trademark Notice: Product or corporate names may be trademarks or registered trademarks, and are used only for identification and explanation without intent to infringe. Library of Congress Cataloging-in-Publication Data Catalog information available from the Library of Congress. ISBN 0-8493-7172-4 A Library of Congress record exists under LC control number: 89002534 Publisher's Note The publisher has gone to great lengths to ensure the quality of this reprint but points out that some imperfections in the original copies may be apparent. Disclaimer The publisher has made every effort to trace copyright holders and welcomes correspondence from those they have been unable to contact. ISBN 13: 978-1-315-89607-6 (hbk) ISBN 13: 978-1-351-07517-6 (ebk) Visit the Taylor & Francis Web site at http://www.taylorandfrancis.com and the CRC Press Web site at http://www.crcpress.com Richard J. Perkins is a Water Resources Specialist with the New Mexico State Environmental Improvement Division in Santa Fe. Dr. Perkins received his PhD in Ecology from the University of Georgia in 1971. He also holds a BA in Biology from the University of Califor- nia and an MS in Zoology from the University of Georgia. In 1972, Dr. Perkins joined the faculty of the University of Kansas, where he taught courses on ecology and environmental quality, was instru- mental in the development of an environmental studies major pro- gram, and became chair of that program. In 1978, he moved to New Mexico and began working to increase the effectiveness of that state's septic tank control program. Dr. Perkins worked with septic tank installers in developing and imple- menting environmentally protective system designs for use in areas not suitable for standard systems, and developed a number of guid- ance manuals along with a training program for installers and enforcement personnel. He has initiated research on the effects of septic tanks on ground wate