![]() The mixture is then routed to a tank where the NAPL and water segregate by density. ![]() Sometimes only one pump is installed near the water table, and it pumps both water and LNAPL. The water will most likely be contaminated with solutes from the LNAPL, and it may require treatment before being discharged back to the environment. If the pumped LNAPL is pure enough, it might still be recycled into some useful product. Electronic controls installed in the borehole or trench sense fluid levels and prevent overpumping on the part of either pump, so that the deep one pumps only water and the upper one pumps mostly LNAPL. Usually, two pumps are employed in such a scheme: a deeper one to pump water and create the depression, and a shallower one positioned with a float to pump LNAPL. A similar two-pump configuration is used in wells screened across the water table. LNAPL extraction trench with two pumps: one to pump water and create the depression in the water table, and another to pump the accumulated LNAPL. ![]()
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