In the case of the oil contamination (the oil storage, Boryspil airport) the regularity of spatio-temporal changes and their factors were defined by the monitoring results. The limits of contamination spreading in the geological environment were defined laterally and vertically. It was determined that the state of geological environment contamination sufficiently depends on a water table elevation, which affects the efficiency of liquidation actions. In the period of groundwater table rise the layer of mobile oil product in most of the contamination area is captured by groundwater. The content of dissolved oil product in the groundwater below the oil product lens significantly declines with the depth, but herewith contamination of the alluvial aquifer occurs. The established regularities are important for the optimization of the liquidation pumping and correct interpretation of contamination condition according to monitoring data. For an objective assessment of the results of remediation and history of state changes of the liquid phase of contamination it should be compared the contamination condition at a point in time with similar groundwater levels positions.

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