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Health Risk Assessment of City Area

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To whom it may concern,

I am looking over a problem for my health risk course, and am having difficulties for an assignment...

The assignment reads as follows.

"The city is proposing to re-condition a high-level bridge next summer (May to September- Summer months) They will be sand-blasting the structure to remove the existing coat of paint before re-surfacing.

The old paint contains high very high level of lead. The City's proposal calls for an enclosed working area and the control of dust by exhaust system. It was calculated that the system could ensue a minimum of 90% containment of lead dust"

I am to identify all those that may be affected by this project (with explanation if needed, i.e. where will the individual pick-up the dust), and rank them according to the order of the importance. Including any relevant information or assumptions.

I don't need to explain the toxicity of lead.

I am assuming those most affected would be the workers sandblasting the lead paint.

Also of importance.
-River under the bridge... which leads to a water treatment plant... however it is my understanding that this will not be a primary concern because they can monitor the lead, and filter it out..

-Playground near the bridge... (Under bridge about 200 yards away)
-Football field near bridge... (Under bride about 100 yards away from bridge)
-A road travels under one end of the bridge (perpendicular to the bridge)
-Footbridge near the bridge

Included is an actual photo of the bridge... the park, and football field can bee just seen in the background.

What is your professional opinion on what is of most concern.. I am thinking the workers, and possibly the children playing at the park (but am not sure the lead particles will travel that far, nor will have that high of a response to be of concern).

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Solution Preview

The workers working on the sandblasting on the bridge are definitely at risk at most potential. This is obvious because the workers are going to be working in the enclosed area, where concentrations of lead particles are at maximum.

Then I would definitely say that the people walking on the footbridge near the bridge that is sandblasted would be ...

Solution Summary

Help with the health risk assessment for a particular area is provided.

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Dr. Judith,
Hope this find you well. This time you can choose the topic you think would be best to present in this case?

Research: Historic Failures of Public Infrastructure

All public infrastructure is at some degree of risk of failure to meet its designated functions. Sound engineering design seeks to understand uncertainty and manage risk to a level that is both affordable and at the same time acceptable to society. Select a public infrastructure failure in the last 20-years and analyze the failure.

At a minimum discuss:

1. Failure:
Describe what happened in sufficient detail to permit the reader to understand the general magnitude and the context and environment in which the failure occurred.

2. Consequences:
Discuss the immediate physical, life safety, economic, and political consequences of the failure of this system. Then discuss the long-term consequences that were identified as a result of this failure.

3. Threats:
Discuss the major threats that this specific infrastructure system was designed to withstand. Was the failure due to one of these identified threats?

4. Countermeasures:
Discuss the countermeasures that were designed into the system to withstand the identified threats. Then discuss the countermeasures that should have been designed into the system
to prevent the failure.

5. Vulnerability:
Describe an approach for calculating the degree of vulnerability of the system to the threat that ultimately caused its failure.

6. Threat Likelihood:
Discuss an approach for determining the probability that the system would be successfully impacted by the threat that ultimately caused the system to fail.

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