Problem 2: A soil profile contains organic carbon in the following concentrations: O horizon (010cm):3.6% organic carbon A horizon (1050cm):1.2% organic carbon B horizon (50100cm):0.8% organic carbon C horizon (100150cm):0.3% organic carbon (a) Show how to estimate the distribution coefficient for PCB (Aroclor 1242) for each of the four horizons of the soil profile. Assume that organic carbon is the primary sorbent. (b) For O horizon (only): If the soil is saturated with water, and if the concentration of Aroclor 1242 in the soil pore water is measured to be 10g/L, show how to estimate the concentration of Aroclor 1242 sorbed to the soil (mg/kg)