Case Study



Part 1: Exposure Assessment Case Study

Directions: After reading the Centers for Disease Control and Prevention case study attached, answer the following questions. 

Case Study: “Cross-sectional Exposure Assessment of Environmental Contaminants in Churchill County, Nevada” by the Centers for Disease Control and Prevention.t  

1) Identify the agent:_____________________________________________________

2) What type of agent is described? 



3) Source: 

____anthropogenic  _____non-anthropogenic 

____area  _____point

____stationary  _____mobile

____indoor _____outdoor

4) Transport/carrier medium: 





___food product item

5) Exposure pathways: 

___eating contaminated food 

___breathing contaminated air 

___touching a contaminated surface

___drinking contaminated water

6) Exposure concentration: 

___mg/kg (food)  ___mg/litre (water)

___ug/m3 (air)  ___ug/cm3 (contaminated surfaces) 

___% by weight  ___fibres/m3 (air) 

7) Exposure route: 

___inhalation  ___dermal contact 

___ingestion  ___multiple routes

8) Exposure frequency: 

___continuous  ____intermittent 

___cyclic  ____random 


9) Exposure duration: 

___seconds   ___minutes 

___hours  ___days

___weeks   ___months 

___years  ___lifetime

10) Exposure setting: 

___occupational  ____non-occupational 

___residential ____non-residential 

___indoors  ____outdoors

11) Exposed population: 

____general population 

____population subgroups 


12) Geographic scope: 

___site  ___specific

___local  ___regional 

___national  ___international 


Part 2: Risk Assessment

Directions: Use the case study attached to provide answers to the following questions.

Case Study: “Illness Associated with Drift of Chloropicrin Soil Fumigant into a Residential Area—Kern County, California, 2003,” 

1. Issue Identification

a. What is causing the identified problem? 

b. Why is the problem a problem?

c. How was the problem initially identified?

d. What are the public perceptions of the hazard?

2. Hazard Identification

a. What types of adverse health effects might be caused by the problem?

b. How quickly and for what duration might the problem be experienced?

3. Dose Response Assessment 

a. Evaluate both qualitative and quantitative toxicity information to estimate the incidence of adverse effects occurring in humans at different exposure levels.

4. Exposure Assessment for the Relevant Population 

a. Determine the frequency, magnitude, extent, duration, and character of exposures to the hazard.

5. Risk Characterization

a. Detail the nature and potential incidence of effects for the exposure conditions described in the exposure assessment. 

Helpful link on Risk Assessment: 

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