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1. Risk: Consider the lifetime health risk of eating 100g apples contaminated with 1ppb of heptachlor (a carcinogenic pesticide). The potency factor for heptachlor has been estimated by EPA as

1.4 (mg/kg/day)^-1. On the basis of 70kg adults who eat one apple per day for 70 years, roughly estimate the annual number of additional heptachlor related cancers one might expect in a population of 100,000. CVEN 5401:Aside from the obvious (consumption, lifetime and body weight assumptions) briefly discuss atleast two other assumptions that underlie the estimate calculated above.

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