Cumulative Risk Adjustment

• Carcinogens and non-carcinogens are addressed separately

• Recommended for sites where there are more than 10 carcinogens or non-carcinogens

PCL-adja = revised PCL for COC “a”

PCLa = Protective Concentration Level for COC “a”

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Calculate all of the PCLs, if there are more than 10 CO, individual PCLs must be adjusted so that the sum of the ratios is less than or equal to 10