Exposure duration: 70 y

Averaging time for carcinogenic effects: 70 y (25,550 d)

Average transfer coefficient = 0.1 µg / m3 (air)/µg/L (water)

Unit Dose Factor for Cancer Risk (lifetime average):

3) Dermal Uptake from Bathing at Home Assumptions

Body weight: 70 kg

Area of body exposed during bathing: about 20,000 cm2 (in the range of central to upper estimate from EPA guidance)

Effective permeability of THMs through skin for a 10-min exposure: 0.05 cm h-1, based on value for chloroform estimated by McKone (1993) from EPA and other models

Bath or shower for 0.17 h (10 min) once per day, 365/day

Exposure duration: 70 y

Averaging time for carcinogenic effects: 70 y (25,550 d)

Unit Dose Factor for Cancer Risk (lifetime average) =

In the tables below, Risk = Cw x UDF x Potency.

The total risk for each chemical is the sum of the risks across the three exposure routes.



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