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.