EDAFOLOGÍA, VOL 15. (1,1 2, 3), PP 33-52 2008
INVESTIGACIÓN Y CONFINAMIENTO DE SUELOS CONTAMINADOS POR HEXACLOROCICLOHEXANO
EN EL POLÍGONO DE TORNEIROS –O PORRIÑO- (PONTEVEDRA)
VARELA-CASTEJÓN Calixto; MARTÍNEZ LOZANO Francisco; BLASCO HERGUEDAS, Oscar
Eptisa, Servicios de Ingeniería, S.A. Rúa Pablo Iglesias no2, Bajo. 15174
Vilaboa, Culleredo (A Coruña)
In a residential area in O Porriño (Pontevedra, Spain-NO) was
detected the presence of an area where waste from the production of lindane
was dumped. Between 1998 and 2000, a research on the presence of contamination
in soil and groundwater allowed the identification of the most affected areas
by various isomers of hexachlorocyclohexane (HCH).
The human health risks analysis conducted indicated the presence of unacceptable
levels of risk, so it was necessary an action to interrupt the routes of exposure
to pollution. After shuffling diverse alternatives it was concluded that the
most appropriate at that time was the placement of the soil in a security cell
constructed in situ.
For the definition of the project, diverse numerical models of the behavior
of groundwater and contamination were developed as a technical support to decision
making about the design of the security cell. The confinement was finally executed
by the construction of cement-bentonite panels up to a maximum depth of 30
meters (to embed them into the impermeable substrate) and a multilayer surface
sealing composite from surface to depth: topsoil, soil, drainage geocomposite,
bentonite geocomposite and geotextile.
Keywords: Lindane, HCH, aquifer, soil contamination, Torneiros, ModFlow, MT3D, security cell, numeric model