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? 
___biological 
___chemical
3) Source: 
____anthropogenic  _____non-anthropogenic 
____area  _____point
____stationary  _____mobile
____indoor _____outdoor
4) Transport/carrier medium: 
___air 
___water
___soil 
___dust 
___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 
___rare
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 
____individuals
12) Geographic scope: 
___site  ___specific
___local  ___regional 
___national  ___international 
___global 
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:  http://oehha.ca.gov/media/downloads/risk-assessment/document/hrsguide2001.pdf