Consider a stream that feeds into a river in a $"$Y$"$ shape. The stream contains point A$.$ After it feeds into the river, is point B$.$ Point X is upstream of point B and of the location where the stream feeds into the river, You collect the following information about one type of PFAS $($PFPeA$).$ Assuming steady state conditions, what concentration of PFPeA would you expect at point B$?$

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