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Well, I must say it was the time

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when we had to open up grease interceptors.

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And grease interceptors are these tanks

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that they are underground

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that all the food waste

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coming from a restaurant would go into,

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and it's supposed to trap grease and food particles.

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And we had to open these manholes

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and extract samples from these grease interceptors.

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And we had to do one

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where we had to monitor it for 24 hours,

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and it was really quite difficult working conditions.

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But we realized it was very important to do this

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because we had to understand what was happening

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inside these grease interceptors,

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so that we could understand the fate

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of a lot of contaminants that entered the sewer systems,

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and the wastewater treatment plants,

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and eventually our rivers and lakes.

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