Class Exercise # 6 - SolutionEstimating RBSL in Groundwater for Benzene

Exposure Route: Ingestion of Drinking Water

Exposure Scenario: EPA Reasonable Maximum

Receptor: Adult Resident

Risk x BW(kg) x AT(yr x d/yr)

RBSL(mg/l) =

IR(l/d) x EF(d/yr) x ED(yr) x SF(mg/kg-d)-1

1 x 10-5 x 70 kg x 70 yr x 365 d/yr

=

2 l/d x 350 d/yr x 30 yr x 0.029(mg/kg-d)-1

= 0.029 mg/l (ppm)

= 29 mg/l (ppb)

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