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Problem 6 A partially submerged tank is leaking 1 g/day of heptachlor into a pond (V = 30,000m³). a) Given a first order decay rate coefficient k of 0.35/day and assuming complete mixing, what would the steady-state concentration of heptachlor be in the pond? Answer: 9.5 x 10-5 mg/L b) If an adult were to drink 2L/day of water taken from the pond, over a period of 5 years, what is the risk of developing cancer due to that level of exposure to heptachlor? Use potency and exposure factors from lecture slides. Answer: 6.6 x 107

Problem 6 A partially submerged tank is leaking 1 g/day of heptachlor into a pond (V = 30,000m³). a) Given a first order decay rate coefficient k of 0.35/day and assuming complete mixing, what would the steady-state concentration of heptachlor be in the pond? Answer: 9.5 x 10-5 mg/L b) If an adult were to drink 2L/day of water taken from the pond, over a period of 5 years, what is the risk of developing cancer due to that level of exposure to heptachlor? Use potency and exposure factors from lecture slides. Answer: 6.6 x 107

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Problem 6 A partially submerged tank is leaking 1 g/day of heptachlor into a pond (V = 30,000m³). a) Given a first order decay rate coefficient k of 0.35/day and assuming complete mixing, what would the steady-state concentration of heptachlor be in the pond? Answer: 9.5 x 10-5 mg/L b) If an adult were to drink 2L/day of water taken from the pond, over a period of 5 years, what is the risk of developing cancer due to that level of exposure to heptachlor? Use potency and exposure factors from lecture slides. Answer: 6.6 x 107
Transcribed Image Text:Problem 6 A partially submerged tank is leaking 1 g/day of heptachlor into a pond (V = 30,000m³). a) Given a first order decay rate coefficient k of 0.35/day and assuming complete mixing, what would the steady-state concentration of heptachlor be in the pond? Answer: 9.5 x 10-5 mg/L b) If an adult were to drink 2L/day of water taken from the pond, over a period of 5 years, what is the risk of developing cancer due to that level of exposure to heptachlor? Use potency and exposure factors from lecture slides. Answer: 6.6 x 107
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