(210–VI–AWMFH, Amend. 31, July 2009) AcknowledgmentsChapter 1 was originally prepared and printed in 1992 under the direction of James N. Krider (retired),national environmental engineer, Soil Conser-vation Service (SCS), now Natural Resources Conservation Service (NRCS). James D. Rickman (retired), environmental engineer, NRCS, Fort Worth, TX; provided day-to-day coordination in the development of the handbook. Authors for chapter 1 included James N. Krider, author; David J. Jones (retired), environmental engineer, NRCS, Bozeman, MT; Donald Stettler (retired), environmental engineer, NRCS, Portland, OR.This version was prepared by the NRCS under the direction of Noller Her-bert, director, Conservation Engineering Division, Washington, DC. Revi-sions to the chapter were provided by Dr. Glenn Carpenter, Ph.D., nation-al leader, animal husbandry, Animal Husbandry and Clean Water Division, Beltsville, MD; Susan McLoud(retired), agronomist, Manure Management Team, Greensboro, NC; Cherie LaFleur, environmental engineer, Central National Technology Support Center, Fort Worth, TX; and Greg Zwicke, air quality engineer, Air Quality and Atmospheric Change Team, Portland, OR. It was finalized under the guidance of Darren Hickman, national environ-mental engineer, Conservation Engineering Division, Washington, DC.