Ontario Clean Water Agency – The Trent Valley Hub of the Ontario Clean Water Agency operates approximately 16 municipal water and waste water systems. Over the past two years our staff has completed the annual flow meter calibration requirements for the Trent Valley Hub. Equipment calibrated ranges from electro-magnetic flow meters, Doppler flow meters, ultrasonic transmitters and pressure transmitters for primary devices such as, venture tubes, weirs and flumes.

City of Toronto, Ashbridges Bay WWTP – The City of Toronto, Ashbridges Bay staff recently installed a new final effluent flow meter system. Due to physical constraints limiting the installation and calibration method, the flow meter system could not be calibrated upon installation as per manufactures recommendations. Further analysis of the new flow meters data showed no correlation to plant inflow vs. plant outflow. Using the dye dilution technique, our staff was able to measure the final effluent flow and determined a calibration coefficient improving the accuracy and correlation of the new flow measurement system.

Greater Vancouver Regional District – Various projects including installation of six Accusonics flow meter systems. Our staff developed a rating curve for the Brunette River using the dye dilution technique; supervised the installation, operation, maintenance and calibration of 26-flow meter billing systems consisting of magnetic flow meters, transit time flow meters, weirs, flumes and Doppler flow meters.

Regional Municipality of Ottawa Carleton – Design build project consisting of the selection of appropriate equipment for the purpose of measuring the flow and level at various interceptor and collector sanitary sewers within the City. Our staff managed and completed the installation, commissioning, system verification, and training for twenty-four complete permanent flow metering and level (HGL) metering stations complete with alarming and data acquisition communications.

City of London – City of London retained a local engineering firm to develop an engineering model to characterize and identify potential sources of hydrogen sulfide. Hydrogen sulfide gas causes various aesthetic, safety and structural problems within the sanitary sewer. Our staff, under the direction of the project engineer installed various instrumentation within the sewer system to continuously monitor flow rates, liquid level, air temperature, liquid temperature, and H2S gas readings. A sewer sampling program was also carried out which consisted of manual measurements for Dissolved Oxygen and pH. Twenty four hour discrete H2S liquid and BOD samples were obtained using automated samplers at 12 nodes on major sanitary sewer trunk lines for a period of 3-weeks.

Labatts Brewery – The majority of the Labatts Brewery potable water consumption is used in the development of their product, with the balance used for bottle washing and other domestic uses. The sewer surcharge levy is based on water consumption and with the majority of water used for product, very little water was being discharged to the sewer. Using the dye dilution technique, our staff was able to calibrate the final effluent flume for Labatts to ensure accurate effluent data was recorded. Labatts staff used this data to negotiate a lower sewer surcharge levy for their plant resulting in significant operational savings.

Weyerhauser Pulp & Paper - The Ministry of the Environment requires the pulp and paper mill to calibrate their final effluent meter using the dye dilution technique on an annual basis. Our staff completed this task in compliance within the ISO standards to satisfy the Ministries requirements.

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