1)             
A community’s groundwater has been contaminated by
perchloroethylene after years of operation of a dry-cleaning
business. Groundwater supplies a spring that feeds a pond and
stream and is also the source for a well. A local family relies on
the well for their drinking water and regularly eats fish caught in
the stream and pond. The concentration of perchloroethylene in the
groundwater is found to be 80 mg/L, and the chronic oral RfD is
0.006 mg/kg/day

a)             
Assuming all exposure to perchloroethylene comes from consumption
of fish and water, and that children and adults eat the same amount
of fish on average per day, calculate the Estimated Exposure Dose
(EED) for an adult and a child.

b)             
What are the adult and child hazard ratios (HR) for this scenario?
Interpret the results.