Case study | Environmental science homework help

Directions: After reading the Centers for Disease Control and Prevention case study, 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   http://www.cdc.gov/nceh/clusters/fallon/factsheet.pdf

1. Identify the agent:_____________________________________________________
2. What type of agent is described? 

biological 

chemical

1. Source: 

anthropogenic   non-anthropogenic  

area   point

stationary   mobile

indoor  outdoor

1. Transport/carrier medium: 

air 

water

soil 

dust 

food product item

1. Exposure pathways:  

eating contaminated food 

breathing contaminated air 

touching a contaminated surface

drinking contaminated water

1. Exposure concentration: 

mg/kg (food)   mg/litre (water)

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

% by weight   fibres/m3 (air) 

1. Exposure route: 

inhalation    dermal contact 

ingestion   multiple routes

1. Exposure frequency:  

continuous    intermittent  

cyclic   random 

rare

1. Exposure duration: 

seconds    minutes 

hours   days

weeks   months 

years   lifetime

1. Exposure setting: 

occupational   non-occupational 

residential  non-residential 

indoors   outdoors

1. Exposed population: 

general population 

population subgroups 

individuals

1. Geographic scope: 

site    specific

local   regional 

national   international 

global