Memorandum

Department of Utilities

TO:	Dave Corliss, City Manager Diane Stoddard, Assistant City Manager Cynthia Boecker, Assistant City Manager
FROM:	Mike Lawless, Assistant Director of Utilities
CC:	Dave Wagner, Director of Utilities Philip Ciesielski,  Assistant Director of Utilities Mark Hegeman, Water/Wastewater System Manager
DATE:	November 23, 2009
RE:	2009 Water and Wastewater Chemical Usage

Attached is a spreadsheet that presents the chemical usage at the treatment plants through November 23, 2009. A brief explanation is provided below.

The water treatment process is using the same measured quantity of chemicals per million gallons treated when compared to previous years. Generally chemical usage is down due to a wet year with less production. The two exceptions are carbon and aqua ammonia. Carbon is higher due to source water quality changes, specifically increased geosmin and organic carbon levels in Clinton Lake and controlling the limits of total trihalomethanes and haloacetic acids. Aqua ammonia is reduced not only due to decreased water production but also due to operational efficiency improvements. The Kaw Plant produced 2.032 billion gallons in 2008 and to date has produced 1.569 billion gallons in 2009. The Clinton plant produced 1.753 billion gallons in 2008 and to date has produced 1.592 billion gallons in 2009.

The wastewater treatment is using the same measured quantity of chemicals per million gallons treated when compared to previous years. Total chemical usage is up due to a wet year and increased flows. The plant treated 3.964 billion gallons in 2008 and had an Actiflo discharge of 92.1 million gallons. In 2009 to date the plant has treated 3.283 billion gallons and had an Actiflo discharge of 222.5 million gallons. Wet years for wastewater mean higher I&I resulting in more wastewater to be treated requiring at times the operation of excess flow treatment units that use more chemicals.