Method development for source tracking of chlorinated compounds at polluted soil sites. Case story of the Varbro well field

Sørensen, Tine

10. term

Master of Science in Environmental Engineering

2012

2012-06-15

70 pages

In this project is focused on source tracking of chlorinated compounds. For this purpose has a polluted soil site (Varbro well field, Hjørring) been used as case story. At Varbro well field have one well been polluted with TCE since 2003. A new investigation strategy is set up for Varbro well field. This strategy is based on a solid basic knowledge about pollution history, geology and hydrology of the area. Investigations showed that the geology in the area is complex and that the polluted well not is in hydraulic contact with the other wells at the well field. Time series is used to estimate the correlation between the concentration and the pumping rates of the polluted well. A delay on 25-90 days between the two time series is observed and tried proved by a simple field experiment. The delay was however not confirmed. Two other field experiment were conducted at the polluted well. These gave specific informations about the depth of the pollution as well as the hydrogeological properties in the area. From these informations were an area of influence sketched. The pollution should be located within this area. The influence area has been narrowed down by particle tracking in the GMS, Groundwater Modeling System, software package. Two possible sources has been pointed out on the basis of these experiments. In order to perform a better and more efficient source tracking is a decision tool produces as a flow chart consisting of several steps where the extent of the suggested investigations reflects the complexity of the case. The purpose of the flow chart is to obtain a faster and more efficient source tracking.

Chlorerede opløsningsmidler ; Jordforurening ; Grundvandsforurening

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