]. Here is how the meeting went [show class the photograph of the DA’s office]: Environmental Officer Each year I test the river water for this toxic chemical and up until this year the concentration levels have been fine. Assistant DA But there’s a problem now?Environmental Officer That’s right. As you can see from this chart, [show class Exhibit 3] the concentration of the chemical in the river is now disturbingly high. Assistant DA What can account for this change? Environmental Officer Well, downstream of the barrier the flow of the river has decreased from 20 to 4 cubic meters per second. Assistant DA Go on. Environmental Officer This decrease does affect the concentration of the chemical in the river. To calculate this concentration you divide the chemical discharge from the factory by the rate of flow of the river. Assistant DA Oh yeah, right [not understanding a word]. Have you noticed any other changes? Environmental Officer Yes, the number of diseased fish in the river. Two years ago we only found 6 diseased fish in the waters near the factory, but just last week we found 64. I’m sure you’ll agree that’s a massive increase. Assistant DA Mmm …I think I better take a ride out to the factory and see what the owner has to say about all this.
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