Question 21 Deposition: Duke Energy and Gov. McCrory ignored cancer-risk estimat

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Question 21

Deposition: Duke Energy and Gov. McCrory ignored cancer-risk estimate for polluted well water approved by CDC Winston Salem Journal - June 9, 2016 http://www.iournalnow.com/news/local/deposition-duke-energy-and-gov-mccrorv-ignored-cancer-risk-estimate/article 85fce9cb-22c1-538d-ab8d-2689942cd98f.html ... "The screening level must carry a lifetime cancer risk of 1 in 1 million. Ideally, water should contain no hexavalent chromium, environmental advocates say, but the level of 0.07 parts per billion is considered health-protective. Well owners such as Amy Brown in Belmont, near Duke Energy's Allen power plant, would face a lifetime cancer risk of 1 in 1 million if the concentration of hexavalent chromium met that level. The chances would be even slimmer if the concentration were smaller." To make the calculations, what two values are needed to calculate incremental risk? _______________ You have to drink the water to get exposed. So, what is being assumed about that process, and for how long? _____________ You work in a building for 10 years and develop asthma. Is this a chronic or acute effect? 100 additional cancers of some type were observed over course of peoples' lifetime in a population of 5 million. Everyone had the same exposure to the causative chemical, in units of mg/kg-day. What is the ILCR for the chemical and that cancer? The NOAEL concentration for a chemical in air for chronic exposure for some endpoint is 0.1 mu g/m^3. What will be selected as the reference dose concentration for inhalation? For the same chemical in the preceding problem, the measured exposure concentration is 0.05 mu g/m^3. What is the Hazard Quotient?

Explanation / Answer

ANSWER IS CHRONIC,

ASTHMA IS CHRONIC, INCURABLE DISEASE. EVEN WHEN YOU FEEL WELL, your asthma hasn't gone away. Even you can't feel it' your airways might still be inflamed. Treating persistent asthma with only ocaasional puff's from a rescue inhaler is like dealing with a leaky pipe in your basement by mopping up the water from the floor. you were only thinking about the symptom and not treating the underlaying cause. overtime if asthma isn't well controlled it can damge your airways permanentelly.

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