Megaterra Ltd. made an expert report concerning the formerly revealed soil and groundwater contamination originated from hydrocarbon in an industrial property in the city of Hajdúnánás focusing on the contamination source and origin as well as responsibilities, liabilities, risks and further measurements.
Hydrocarbon contamination was also found by our investigations due to former activities (storage and manipulation of fuels) on the site in question.
Chromatograms provided by the testing laboratory and the results of the on-site soil gas analysis justified that the contamination is rather old, but partly consists of new , non-degradable components too. The former and actual site owners are responsible simultaneously for the pollution. The rate of responsibilities is determined based on the ownerships and the activities of the owner.
29 shallow, 3 deep boreholes were drilled, soil and groundwater were sampled and analysed in the laboratory. On-site soil gas analysis with Dräger tubes and field analyser were carried out.
Analytical data and results of the risk assessment proved that remediation of soil and groundwater of the site is necessary. Contamination plum was delineated and remediation value was determined based risk estimation.
Contaminated soil surface above intervention (“D”) value is 840 m2, soil volume is 1.680 solid m3. Contaminated groundwater surface above intervention (“D”) value is 9.500 m2, groundwater volume is 32.700 m3.
On-site biopad remediation of contaminated soil and deep drain with collecting well extraction and filtering of the contaminated groundwater is proposed taking into consideration the geological and hydrogeological circumstances, the area and degree of groundwater contamination, expected speed and direction of contamination plume movement, results of human risk assessment and the availability of suggested technology .
Remediation target value could be reached within 27 months. Finishing the active remediation a 4 year long monitoring period will start sampling and analysis the groundwater of monitoring wells quarter-yearly.