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Improper drainage management in handling kerosene for a period of over 30 years has resulted in severe groundwater pollution in the southern coastal plain aquifer of Israel. Oil that had drained via open trenches infiltrated at one point to a depth of 43 meters (m), polluting the unsaturated zone, accumulating as a lens above the water table. Investigations of the extent of the pollution were based on research wells dug to a depth of 53 m, which enabled a partial mapping of the boundaries of the contaminated area, including its dimensions in both the aquifer and the unsaturated zone. A direct relation was discovered between one of the pollution sources and the oil lens found above groundwater. Field observations have enabled monitoring of variations in the lens's configuration and location within the aquifer and identification of factors that may have caused these variations. A historical reconstruction of the pollution process revealed that oil reached the groundwater and accumulated in a lens of tens of centimeters in thickness many years before oil was found in water pumped from a pumping well in the region.

GROUNDWATER CONTAMINATION BY OIL IN ISRAEL'S COASTAL PLAIN AQUIFER