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Toronto Hydro CR Report 2016

OUR ENVIRONMENT G4-EN24 Spills Toronto Hydro is required to report priority spills annually to the CEA. The CEA defines a priority spill as: • A petroleum spill that is more than 500 litres • A spill containing more than 1 gram of PCBs • Any volume of petroleum based or PCB contaminated substance that enters a water body Priority spills In 2015 and 2016, Toronto Hydro incurred a total of 31 and 41 priority spills, respectively. In these two years no spill exceeded 500 litres. Four spills in 2016 contained PCBs more than 1 gram, three of which entered a water body. No spills containing PCBs more than 1 gram occurred in 2015. In each situation, remediation of the spill was completed. The corroded or defective electrical equipment was removed from service and replaced with a new unit. Eliminating PCBs entering water bodies Toronto Hydro initiated a capital replacement program in 2016 to replace all submersible transformers in the distribution system that were manufactured prior to 1986. Most submersible transformers of this vintage, which at the beginning of 2016 amounted to approximately 900 units, were suspected of having oil containing PCBs. The objective of the project was to eliminate the potential for releases of PCBs to a water body. By the end of 2016, approximately 500 of these units were replaced. Toronto Hydro expects all transformers included in the original scope of the project will be replaced in the near future. PCBs Removed from Toronto Hydro’s System 82 TORONTO HYDRO I 2016 CORPORATE RESPONSIBILITY REPORT 50ppm - 5,000ppm solid 50ppm - 500ppm liquid > 500ppm solid >500ppm liquid 4,614 4,456 17,937 6,250 2,636 20,402 38,672 6,325 1,957 3,753 3,096 3,600 535 1,892 1,048 2,029 2013 2014 2015 2016


Toronto Hydro CR Report 2016
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