Peer review contributors City of Port Townsend City of Ta Albertson. Orris City of Vancouver Baird. Carl City of Yakima Barwin, Bob Cosmopolitan Engineering CTE EI Breithaupt, Steve Department of Ecology Brown, Russ tment of Health Chung. S.K. Duke Engineering Services, Inc Cook. Kirk Earth Tech Earle. George Enviro Enterprises, Inc Fox, Tom Environment One Corporation Gleason. dennis Harlan. Sue Hammond Collier Wade-Livingston Associates Hicks. Mark HDR Engineering, Inc Hines. michael Island County Kmet, Nancy KCM International Larson briar Kennedy/Jenks Consultants Lin, Li-Yin King County Wastewater Treatment Division Kitsap County Messman Stew Lakehaven Utility District Meyer, Chuck Montgomery Watson Moore. Bill Northshore Utility distr Olivers Clair Oregon DEQ Parametrix, Inc Reid, Terry Phillips driscopipe Shakhnovich. boris Pierce County Sl Reid Middleton yth, John Skillings Connolly, Inc Southeast Environmental Engineering. L L C Tom, Andy okane County Vivolo. tony Techtrade International Inc Weaver. Brian Treatment Equipment Company Weber. Jim URS Consultants. Inc. Whitby, Elliott Westin Engineering, In Wm H. Reilly Co Firms and organizations that provided support for this effort Publishing Aqua-Aerobics Systems, Inc Ecology extends appreciation to Technical RWBeck Publications, King County Department of Berryman Henigar Natural Resources Wastewater Treatment Brown caldwell Division, for publishing this manual CH2M Hill. Inc City of Bellevue Foulk, Jamie(Project Lead) City of bellingham Lowe, Susan(Editor) City of Everett Olson, Karen(Illustrator) City of Kennewick City of marysville City of Moses LakeDecember 1998 vii Peer review contributors Albertson, Orris Baird, Carl Barwin, Bob Berschauer, Doug Breithaupt, Steve Brown, Russ Chung, S.K. Cook, Kirk Custin, Alex Earle, George Fox, Tom Gleason, Dennis Harlan, Sue Hicks, Mark Hines, Michael Kmet, Nancy Larson, Brian Lin, Li-Yin Mann, David Messman, Stew Meyer, Chuck Moore, Bill Olivers, Clair Perry, Don Reid, Terry Shakhnovich, Boris Skaggs, Don Smyth, John Thompson, Randy Tom, Andy Vivolo, Tony Weaver, Brian Weber, Jim Whitby, Elliott Firms and organizations that provided support for this effort Aqua-Aerobics Systems, Inc. R W Beck Berryman & Henigar Brown & Caldwell CH2M Hill, Inc. City of Bellevue City of Bellingham City of Everett City of Kennewick City of Marysville City of Moses Lake City of Port Townsend City of Tacoma City of Vancouver City of Yakima Cosmopolitan Engineering CTE Engineers Department of Ecology Department of Health Duke Engineering & Services, Inc. Earth Tech ENSR Enviro Enterprises, Inc. Environment One Corporation Gray & Osborne, Inc. Hammond Collier Wade-Livingston Associates HDR Engineering, Inc. Island County KCM International Kennedy/Jenks Consultants King County Wastewater Treatment Division Kitsap County Lakehaven Utility District Montgomery Watson Northshore Utility District Oregon DEQ Parametrix, Inc. Phillips Driscopipe Pierce County Reid Middleton Skillings Connolly, Inc. Southeast Environmental Engineering, L.L.C. Spokane County Techtrade International, Inc. Treatment Equipment Company URS Consultants, Inc. Westin Engineering, Inc. Wm. H. Reilly & Co. Publishing Ecology extends appreciation to Technical Publications, King County Department of Natural Resources Wastewater Treatment Division, for publishing this manual. Foulk, Jamie (Project Lead) Lowe, Susan (Editor) Olson, Karen (Illustrator)