DOI: 10.5593/sgem2012/s02.v2008


Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 55 - 62 pp


Geological conditions in Latvia are where the surficial sediment layers often have good
filtration characteristics, which means that the possible contamination can migrate to
deeper horizons of groundwater (artesian waters). That means that surface waters as
well as soils must be defended from different kind of pollution.
Particular attention in this article is paid to the research of two waste dumps around and
in the capital city of Latvia – Riga, which are planned to be re-cultivated in future and
two sites, which are former toxic hazardous soil and liquid substances dump sites,
where the remediation of site is of priority need. Heavy metal remediation in the case
study of “BLB Baltijas Terminal” is mostly connected with the treatment of soil and
immobilizing of toxic elements in situ - S/S technology is the most appropriate in this
case. Leaching test shows that in the stabilized and solidified soil leaching is diminished
and is at the acceptable level. In 2010 a remediation project of the Inčukalns acid tar
ponds began, the main task of which is to prevent contamination of the territories
alongside with acid tar ponds. Project implementation will include treatment with lime
and replacement, excavation and disposal to landfill (with or without treatment) and unengineered
capping as well as pumping out the contaminated waters, then treating and
injecting it back into the subterranean in order to stop mobility of the contaminated

Keywords: dump sites, remediation, heavy metals, acid tar