Effect of pumping on the contaminant transport model

This simulation was made on a landfill that constantly discharge 50mg/L of Pb. The landfill was modeled using visual Modflow, considering a linear sorption, with an initial Pb as 100mg/L, the model shows the effect of pumping on the Pb transport. The pumping rate was 1000m3/day.

a) after 10 days of pumpingb) after 100 days of pumping

c) after 300 days of pumping