An individual well water is used by a family without treatment for its sole source of supply. Due to nearby contamination, a concentration of trichloroethylene of 5 pg/L is present in the water. Based on the information in Table 8.E.5, would you regard the risk as unacceptable - justify your answer Estimated Reference Dose Factors (RfD) and Slope Factors (SF) for Oral Ingestion of a Variety of Chemicals Table 8.E.5 Estimated Reference Dose Factors (RfD) and Slope Factors (SF) for Oral Ingestion of a Variety of Chemicals Species Arsenic (inorganic) Benzene Benzo(a)pyrene Cadmium Chlordane Chloroform Chromium(VI) 1,1-Dichloroethylene Methyl mercury Naphthalene Polychlorinated biphenyls (PCBs) 2,3,7,8-TCDD (dioxin) Tetrachloroethylene Trichloroethylene Toluene Vinyl chloride Oral RfD (mg kg-¹d-¹) 3.0 × 10 -4 No data No data 5.0 × 104 5.0 X 107 1.0 × 10-² 3.0 × 10-3 9.0 × 10-³ 1x 104 2 x 10-² No data No data 1.0 × 10-² 6 × 10-3 2.0 × 10-¹ No data Oral SF (mg kg-¹d-¹)-1 1.5 2.9 × 10-2 7.3 No data 3.5 × 10-1 6.1 × 10-3 No data 6.0 × 10-1 No data No data 1.0 1.5 X 105 5.2 x 10-² 1.1 x 10-² No data 1.9

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
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An individual well water is used by a family without treatment for its sole source of supply. Due to nearby contamination, a concentration of trichloroethylene
of 5 pg/L is present in the water. Based on the information in Table 8.E.5, would you regard the risk as unacceptable - justify your answer
Estimated Reference Dose Factors (RfD) and Slope Factors (SF)
for Oral Ingestion of a Variety of Chemicals
Table 8.E.5 Estimated Reference Dose Factors (RfD) and Slope Factors (SF)
for Oral Ingestion of a Variety of Chemicals
Species
Arsenic (inorganic)
Benzene
Benzo(a)pyrene
Cadmium
Chlordane
Chloroform
Chromium(VI)
1,1-Dichloroethylene
Methyl mercury
Naphthalene
Polychlorinated biphenyls (PCBs)
2,3,7,8-TCDD (dioxin)
Tetrachloroethylene
Trichloroethylene
Toluene
Vinyl chloride
Oral RfD
(mg kg-¹d-¹)
3.0 × 10-4
No data
No data
5.0 × 10-4
5.0 × 104
1.0 × 10-2
3.0 × 10-3
9.0 x 10-3
1 x 104
2 x 10-²
No data
No data
1.0 × 10-²
6 x 10-3
2.0 × 10-¹
No data
Oral SF
(mg kg-¹d-¹)-1
1.5
2.9 × 10-²
7.3
No data
3.5 × 10-¹
6.1 × 10-3
No data
6.0 × 10-1
No data
No data
1.0
1.5 X 105
5.2 x 10-²
1.1 × 10-²
No data
1.9
Transcribed Image Text:An individual well water is used by a family without treatment for its sole source of supply. Due to nearby contamination, a concentration of trichloroethylene of 5 pg/L is present in the water. Based on the information in Table 8.E.5, would you regard the risk as unacceptable - justify your answer Estimated Reference Dose Factors (RfD) and Slope Factors (SF) for Oral Ingestion of a Variety of Chemicals Table 8.E.5 Estimated Reference Dose Factors (RfD) and Slope Factors (SF) for Oral Ingestion of a Variety of Chemicals Species Arsenic (inorganic) Benzene Benzo(a)pyrene Cadmium Chlordane Chloroform Chromium(VI) 1,1-Dichloroethylene Methyl mercury Naphthalene Polychlorinated biphenyls (PCBs) 2,3,7,8-TCDD (dioxin) Tetrachloroethylene Trichloroethylene Toluene Vinyl chloride Oral RfD (mg kg-¹d-¹) 3.0 × 10-4 No data No data 5.0 × 10-4 5.0 × 104 1.0 × 10-2 3.0 × 10-3 9.0 x 10-3 1 x 104 2 x 10-² No data No data 1.0 × 10-² 6 x 10-3 2.0 × 10-¹ No data Oral SF (mg kg-¹d-¹)-1 1.5 2.9 × 10-² 7.3 No data 3.5 × 10-¹ 6.1 × 10-3 No data 6.0 × 10-1 No data No data 1.0 1.5 X 105 5.2 x 10-² 1.1 × 10-² No data 1.9
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