Sewage treatment plants in compliance; airport system still not 100% operational.
The information was presented to the Public Works Committee in a Mar. 24 report by Matthew D'Hondt, Solid Waste and Wastewater Operations Manager.
The Paris and St. George plants were in almost perfect compliance with all of the ministry's requirements. The Cainsville sewage lagoons, the source of unacceptable levels in past years, also met all of its Certificate of Approval conditions.
The Airport clarigester system, a historical source of problems, was still exceeding some monthly levels of biochemical oxygen demand, suspended solids, and phosphorus before it was permanently shut down on Jun. 16, 2013. Flows were then diverted to the new Airport sewage treatment system which produced levels that were all within acceptable limits.
A groundwater monitoring report for the airport sewage treatment system from Stantec, the county's consultant, noted that tile beds had been discharging into the groundwater and producing unacceptable high nitrate levels in three test wells and a neighbour's well for the first half of 2013. After the new sewage treatment plant kicked in, groundwater samples still remained about the same, because the plant's chemical injection system had not yet been connected. Test wells also detected traces of industrial solvents including benzene, toluene, and xylene, a historical problem at the site. The well on private property next door did not show signs of pollution from volatile organic compounds.
The Brant County Health Unit, the neighbours, and the medical officer of health were all notified about high levels of sodium in downgradient groundwater, likely the result of road salt de-icing on Greens Road.
Stantec will continue monitoring groundwater wells at the Airport sewage treatment plant and analyzing to see if the plant's substantial completion will result in decreased contamination levels.
The Ontario Clean Water Agency operates the county's wastewater facilities consisting of the Paris Water Pollution Control Plant, the St. George Water Pollution Control Plant, the Cainsville sewage lagoons, the Airport sewage treatment system, six pumping stations and forcemains, and two odour control units. In 2013, the OCWA's operation costs were $750, 736, 2.5 per cent above budget.
In an e-mail to the St. George Lance, D'Hondt said the additional costs were due to additional materials and supplies as a result of the varying nature of wastewater inflow; the new Brant 403 Business Park Pumping Station coming on-line; and construction liaison and start up at the Airport Sewage Treatment System.
At the new Airport facility, extra time was needed for staff to become familiar with its operation and to prepare operating procedures, a typical scenario.
The Airport system is a sequencing batch reactor unit which requires an initialization period to generate adequate bacteriological organisms for the process to work. The system is not yet fully functioning. D'Hondt said the county anticipates full operation by the end of spring.
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|Publication:||Paris Chronicle (Paris, Canada)|
|Date:||Apr 28, 2014|
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