grand canyon hlt555 week 3 Exposure and Risk Assessment

Details: This assignment is in two parts: Part 1: Exposure Assessment Case Study Read “Cross-sectional Exposure Assessment of Environmental Contaminants in Churchill County, Nevada” by the Centers for Disease Control and Prevention (2003). Use this case study to complete the Exposure Assessment form. Part 2: Risk Assessment Case Study Read “Illness Associated with Drift of Chloropicrin Soil Fumigant Into a Residential Area – Kern County, California, 2003.” Use this case study to complete the Risk Assessment assignment. Risk Assessment (50 points) Directions: Use the case study 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,” located on p. 154 of the textbook 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. Exposure Assessment Case Study (50 points) 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 .cdc.gov/nceh/clusters/fallon/factsheet.pdf”>http://www.cdc.gov/nceh/clusters/fallon/factsheet.pdf 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