Define when the oil will be free of contamination

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An oil storage area abandoned 19 yrs ago had oil spilled on the ground and saturated the soil at a concentration of 400mg/kg of soil. A recent soil sample shows a concentration of 20mg/kg. A man says that the oil was reduced at a rate of 20mg/kg each year and in one year will be free of contamination. Is this a good assumption?

Reference no: EM13315948

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