### Model of transport of pollution before remediation pumping (linear sorption)

Chlorinated hydrocarbons dissolved in groundwater have the ability to absorb on the rock skeleton if its sorption abilities are not weakened by a long-term, very concentrated pollution. The coefficient of distribution stands for the rate of concentration of sorbed pollution (mg/kg)and the concentration of the dissolved pollution (mg/l). Its dimension is (l/kg). The retardation factor of 3.63 was set with the use of Kd=0.125 l/kg, rs=2.74 kg/dm3 and nef=0.13. The result of the model confirmed the effects of sorption on slowing the transport, on decreasing the concentration of pollution and on decreasing the spread of pollution. We can determine the concentration of dissolved pollution after 50 years of transport. This figure indicates that a concentration of 0.1% at the front of the pollution cloud does not hit the pond. The model proves that pollution with concentrations of 50-60% will reach only the intersection of tectonic lines in 50 years. This is approximately half the distance of the alternative without sorption. The pollution which spreads towards the pond follows the tectonic line and its permeable neighbourhood. The width of the pollution cloud with a concentration of 0.1% is about 35 m (without sorption it is 67 m).