Abstract

Floatable pollution is an aesthetic nuisance often associated with runoff from urban areas and other sources. In 2008, the City of Ottawa, Ontario initiated a study of floatable pollution in an effort to develop a pollution prevention and control plan to control combined sewer floatables in compliance with applicable Ontario Ministry of the Environment (MOE) regulations. The floatables study, performed by G. A. Clark and Associates Limited and HydroQual, Inc., included field measurements and desktop analyses to define the nature of the combined sewer floatables issue in Ottawa, and to estimate floatables capture under existing conditions and with selected control alternatives.

The study recommended the implementation of several actions to cost effectively improve floatables control. Study recommendations included continuing existing activities that control street litter, implementing the real time control (RTC) program already underway to control combined sewer overflow (CSO) discharges, installing gas traps on all catchbasins in the study area, and conducting floatables monitoring and analyses for a period of three years to track the annual capture of floatables.

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