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# 49125 Environmental Risk Assessment

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## Question:

Q1. 25%

In risk assessment, the probability of occurrence is one of the key parameters. In a study of fish health in a local river, the mean weight of all fish is 75 g and the standard deviation is 8

1. Assuming that the fish weight is normally distributed, calculate the probability of local fish that weigh:

(a) between 60 and 78 g.

(b) more than 93 g.

(c) less than 64 g.

(d) equal to 62 g. using the Statistical Tables 1-3 provided on UTSonline.

Q2. 25%

Following fish death in a local river, an insecticide called malathion was detected due to chemical discharge. The insecticide concentration was assumed to be normally distributed, with a population mean concentration (m) of 0.152 µg/L, and population standard deviation

(s) of 0.020 µg/L. A sample of n = 80 was subjected to further chemical analysis. Estimate the probability that malathion concentration would fall:

(a) above 0.159 µg/L

(b) between 0.148 and 0.156 µg/L

(c) below 0.150 µg/L

(d) between 0.145 and 0.154 µg/L using the Statistical Tables1-3 provided on UTSonline.

Q3. 25%

A property developer is proposing a contaminated land for housing development. As the advisor for the city council, you are responsible for conducting a detailed assessment of the land about its suitability for housing. Elaborate (1) your overall approach, (2) how you will gather data about the contaminated land, and (3) how to assess data quality.

Q4. 25%

Marine fish are consumed daily in a coastal population in Malta. However, such fish were found to contain methyl-mercury (methyl-Hg) which is highly toxic, with a recommended reference dose (RfD) of 0.1 µg/(kg body weight-day). To assess the risk from fish consumption to adult human health in the community, an investigation was conducted with the following results, with methyl-Hg concentrations following a normal distribution:

### Cite This Work

My Assignment Help (2021) Environmental Risk Assessment [Online]. Available from: https://myassignmenthelp.com/free-samples/49125-environmental-risk-assessment/developer-is-proposing-a-contaminated-land.html
[Accessed 15 April 2021].

My Assignment Help. 'Environmental Risk Assessment' (My Assignment Help, 2021) <https://myassignmenthelp.com/free-samples/49125-environmental-risk-assessment/developer-is-proposing-a-contaminated-land.html> accessed 15 April 2021.

My Assignment Help. Environmental Risk Assessment [Internet]. My Assignment Help. 2021 [cited 15 April 2021]. Available from: https://myassignmenthelp.com/free-samples/49125-environmental-risk-assessment/developer-is-proposing-a-contaminated-land.html.

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