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Toronto Hydro 2014 CR Report_FINAL

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 over 500 L • A spill containing PCBs over 1 g • Any volume of petroleum based or PCB contaminated substance that enters a water body Priority spills In 2014, Toronto Hydro incurred a total of four priority spills, as outlined below. This is a reduction from the seven priority spills incurred in 2013. 1. The largest spill was a release of 200 L of oil that contained PCBs in a concentration of 18.9 ppm from a leaking submersible transformer. The transformer had a corroded base which allowed the oil to slowly leak from the transformer. 2. The second largest priority spill involved 135 L of oil with a PCB concentration of 6.9 ppm leaking from a corroded transformer. 3. The third largest occurred when 20 L of oil with a PCB concentration of 2.3 ppm leaked from a defective transformer. 4. The smallest of the four priority spills involved 5 L of oil with a PCB concentration of 2.1 ppm which leaked from a defective transformer. In each situation, the vault, associated drain and sewer were cleaned immediately upon notification of the spill. The corroded or defective transformer was removed from service and replaced with a new PCB-free transformer. 62 TORONTO HYDRO 2014 CORPORATE RESPONSIBILITY REPORT


Toronto Hydro 2014 CR Report_FINAL
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