Question

An underground hazardous waste storage tank is leaking. The
contaminant concentration directly beneath the site is 0.5 mg/L. The
contaminant is travelling at an effective rate of 0.4 m per day
towards a water well which is 2 km away.
Assume that the degradation of the contaminant follows a first
order reaction, and the initial concentration of the contaminant
becomes half in 10 years.
In this case, the contaminant concentration expected at the well
under steady state conditions is
mg/L (rounded off to
two decimal places).​

Answer 1

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