R.V. Anderson Associates Limited (RVA) was engaged in 1999 to complete a Pollution Prevention and Control Plan to address concerns with Combined Sewer Overflows (CSO). The study followed Schedule C procedures contained in the Class Environmental Assessment for Water and Wastewater Projects and was funded by the City of Welland, the Region of Niagara and the Environment Canada Great Lake Cleanup Fund. The study was guided by a steering committee with members from the funding agencies, the Niagara Peninsula Conservation Authority, the Ministry of Natural Resources and the Ministry of the Environment. The purpose of the study was to develop a comprehensive and strategic pollution prevention and control plan with the objective of complying with the MOE’s Procedure F-5-5 interim goals for CSO control. Phases 1 and 2 of the Class EA defined the CSO problem, and developed and evaluated planning alternatives such as optimizing the existing system, separating remaining combined sewers, constructing retention facilities and constructing addition wet weather treatment facilities. The preferred solution was constructing new wet weather treatment facilities and continuing with sewer separation. Phases 3 and 4 of the Class EA included a detailed evaluation of wet weather treatment technologies including retention treatment basins, high rate vortex technologies, high rate filtration, and ballasted flocculation. Retention treatment basin (RTB) technology was selected as the preferred alternative. The Class EA was filed in 2003. The project also included CSO characterization and treatability testing, and preparation of a “CSO Treatment Technologies Manual”, carried out by a specialty subconsultant to RVA.
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