Question

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The residential drinking water in a small town with a population of 50,000 has been detected to contains 0.5 ppb tetrachloroethylene. There is also a waste incineration plant in the town that emits 0.001 ppb dioxin. Long-term health monitoring of the town yielded the following data: With Disease Without Disease Exposed 72 185 Not Exposed 34 560 1. What are the CDI values of the two contaminants? (5 points) 2. How many cancer cases will be caused by tetrachloroethylene and dioxin, respectively? (5 points) 3. What exposure assessment report can we generate? (5 points) 4. Calculate the overall risk that the residents are facing. (5 points)

Answer 1

ANSWER:-

Given, population=50000 Conuntrations

  $C_{TCE} = 0\cdot5 pbb = 0\cdot 5 Mg/l$

  

CTCbb = 0.001 pbb = 0.001 Mg/l

  

1)

Conc(Mg/l) x water intake(1/day) x 10-(mg/Mg) СртСЕ = Bodyweight(kg)

0.5 x 2 x 10-3 70

0.001 x 2 x 10-3 CDJTCDD = - 70

2) Potency factors

PFICE = 1.1 x 10-2mg/kg-day)-1

PFTCDD = 1.56 x 105(mg/kg-day-1

  

Riskrce=1:1 x 10-2 x 1.428 x 10-5

  

= 0.157 x 10-4

  

Riskc d = 1.56 x 105 x 2.857 X 10-8

=0.00445692

= 4456.92 x 10-4

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