The residential drinking water in a small town with a population of 50,000 has been detected to contains 0.5 ppb tetrachloroethylene. There is also a waste incineration plant in the town that emits 0.001 ppb dioxin. Long-term health monitoring of the town yielded the following data: With Disease Without DiseaseExposed72185Not exposed34560Show how to calculate the CDI values for the 2 contaminants: (CDI_TCE = 5.86x10-6 mg/kg/d, CDI_Dioxin = 1.17x10-8 mg/kg/d)Show how to calculate the number of cancers caused: 0.01 cases caused by TCE and 91 cases caused by Dioxin TABLE 9Toxicity Data for Selected Potential CarcinogensPotency FactorOral RouteChemicalCategory(mg/kg-day)-1ArsenicA1.75BenzeneA2.9 × 10-2Benzol(a)pyreneCadmiumB211.5В1-Carbon tetrachlorideB20.13ChloroformB26.1 × 10-3Chromium VIA-DDTB20.341,1-DichloroethyleneDieldrinC0.58B230HeptachlorHexachloroethaneB23.41.4 × 10-27.5 × 10-3Methylene chlorideNickel and compoundsPolychlorinated biphenyls (PCBS)2,3,7,8-TCDD (dioxin)Tetrachloroethylene1,1,1-Trichloroethane (1,1,1-TCA)Trichloroethylene (TCE)Vinyl chlorideB2AB27.71.56 X 1055.1 × 10-2B2B2D-B21.1 × 10-2A2.3Source: U.S. EPA, www.epa.gov/iris.

Question is based on a small town whose population is provided in the question. Concentration of…

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Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

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The residential drinking water in a small town with a population of 50,000 has been detected to contains 0.5 ppb tetrachloroethylene. There is also a waste incineration plant in the town that emits 0.001 ppb dioxin. Long-term health monitoring of the town yielded the following data:

	With Disease	Without Disease
Exposed	72	185
Not exposed	34	560

Show how to calculate the CDI values for the 2 contaminants: (CDI_TCE = 5.86x10-6 mg/kg/d, CDI_Dioxin = 1.17x10-8 mg/kg/d)
Show how to calculate the number of cancers caused: 0.01 cases caused by TCE and 91 cases caused by Dioxin

TABLE 9
Toxicity Data for Selected Potential Carcinogens
Potency Factor
Oral Route
Chemical
Category
(mg/kg-day)-1
Arsenic
A
1.75
Benzene
A
2.9 × 10-2
Benzol(a)pyrene
Cadmium
B2
11.5
В1
-
Carbon tetrachloride
B2
0.13
Chloroform
B2
6.1 × 10-3
Chromium VI
A
-
DDT
B2
0.34
1,1-Dichloroethylene
Dieldrin
C
0.58
B2
30
Heptachlor
Hexachloroethane
B2
3.4
1.4 × 10-2
7.5 × 10-3
Methylene chloride
Nickel and compounds
Polychlorinated biphenyls (PCBS)
2,3,7,8-TCDD (dioxin)
Tetrachloroethylene
1,1,1-Trichloroethane (1,1,1-TCA)
Trichloroethylene (TCE)
Vinyl chloride
B2
A
B2
7.7
1.56 X 105
5.1 × 10-2
B2
B2
D
-
B2
1.1 × 10-2
A
2.3
Source: U.S. EPA, www.epa.gov/iris.

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