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Highlight 7-28 of the HRS Guidance Manual

A well contains chemicals in the concentrations listed below. While no one of the chemicals alone was found in a concentration that would place the well in Level I, consideration of the chemicals in combination places the well in this category. When the I and J indices are calculated, the value for I is greater than 1 (i.e., 1.4) and the well is scored as Level I. This is true even though the J index is less than 1.

Chemical Concentration Ci (mg/L) Cancer Risk Screening
Concentration
SCi (mg/L)
Ci/SCi I
X
4.7 x 10-4
6.3 x 10-4
0.75
1.36
Y
3.1 x 10-4
4.2 x 10-3
0.074
Z
1.5 x 10-4
2.8 x 10-4
0.54


Chemical Concentration Cj (mg/L) Reference Dose Screening
Concentration
CRj (mg/L)
Cj/CRj J
X
4.7 x 10-4
1.6 x 10-1
0.0029
0.0039
Y
3.1 x 10-4
6.7 x 10-1
0.00046
Z
1.5 x 10-4
2.8 x 10-1
0.00054

 

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