Scholarly record

MODELLING OF WALLS FOR REDUCING CONTAMINATION THAT IS CAUSED BY A FORMER DUMP SITE IN RIGA CITY, LATVIA

Aivars Spalviņš, Irīna Eglīte, Inta Lāce, Kaspars Krauklis

Abstract

Building of a shopping center was planed in Riga city, Latvia. Unfortunately, the center was located in the former dump site place where the about eight meters thick waste body contained an irregular mixture of oil products, Phenols, Detergents and metals: Copper, Lead and Chromium. It was presumed that these dissolved in groundwater contaminants should enter the nearby lake and dich. It was found out that cleaning of the place was not time and cost effective. It was necessary to reduce the concentration of these pollutants before they entered the both surface water objects. To find the proper walls for reduction of the contaminated groundwater concentration, the local hydrogeological model (HM) was built. The Groundwater Vistas (GV) program was used to run HM. The primary data for HM were provided by the HM of Latvia LAMO4. It was found out that immobilization of the contamination body by using an enclosing impermeable wall was not practicable, because the valid wall must cover there the 37m thick sand layer. Results of modelling proved that to reduce the contaminant concentration, the permeable reactive wall that cleans groundwater must be established before the lake. No wall is necessary for protecting the ditch, because its discharge flow is small and it is not contaminated. Results of modelling may be useful for specialists dealing with impermeable and reactive walls for reducing harmful effects of contaminated groundwater.

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DOI resolver: doi.org/10.5593/sgem2021/3.1/s12.29

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