In 2007, a soil survey was performed on a site contaminated with tetrachloroethylene. Traditional MIP results indicated a potential contaminated zone starting at 6m-gl. Sampling wells were placed with filter settings at 6-7 m-gl and 10.5-12.5m-gl. Groundwater samples at 6-7 m-gl indicated the presence of tetrachloroethylene and trichloroethylene at concentrations of respectively 410µg/l and 8.6 µg/l.

The EnISSA MIP was carried out in the plume zone, near a sampling well. At 6.5m-gl, tetrachloroethylene was found at concentrations up to 800μg/l. These high concentrations are located around a thin clay formation at 6.5 m-gl. Taken into account the sampling volume using a traditional well, the EnISSA result is in very close match with the lab results.

At 7.80 m-gl a very small clay zone was found. Here, up to 90 µg/l of trichloroethylene was measured which is just above the cleanup value (70 µg/l).As shown in the figures below, the EnISSA MIP profiles give a high resolution depth profile of the contaminations at ppb level. It is clear that whereas the results of the two sampling wells underestimated the problem of trichloroethylene, the EnISSA MIP is capable of giving a high resolution soil depth profile for both tetrachloroethylene and trichloroethylene. Such soil depth profiles are of high value for defining efficient in-situ clean up strategies.