France – Greece – Austria – Poland - HPC AG

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via fax +49 9080 999 289 » What do you expect from a customer magazine? Subjects you are interested in.We hope we were on the right track so far - but one never knows .... How do you like HochProCentig? What could be improved? We wonder whether you could help us a bit: just fill in this form and fax it back to us. Many thanks in advance for your ideas! very interesting interesting moderate rather uninteresting totally uninteresting Of course an engineer checks whether his ideas are successfull. Why should that be different at a costumer magazine? I’m curious about the result …« Yours sincerely, Harvey 14 www.hpc.ag HPC, September 2009
It was possible to recognize two different geological units on site which collect groundwater and thus dissolved contaminants on site in a kind of huge drainage channel and discharge them into the downgradient area. To check and confirm these assumptions, a total of five different geophysical investigation methods was applied in order to eliminate lacks of information concerning the subsoil situation. Methods applied included geo-electric resistance methods, such as horizontal and vertical resistance tomography, mise-à-lamasse (charged body potential method), induced polarization and geo-electric cylinder. The measurements included the site area and allowed to confirm and detail the assumptions made. The short-term pumping tests, temperature-conductivity logs and flow measurements carried out simultaneously in selected monitoring points allowed to determine the various productive horizons within the heterogeneous limestone aquifer. All information and data collected provided for a first three-dimensional impression of the subsoil settings and helped to identify in particular the relevant zones of contaminant transfer in the aquifer. A „geo-electric“ tracer test currently carried out flow directions serving for the identification of prefered groundwater movements, as flow directions and speed. Presently, we consider to process geological and hydrogeological information obtained by a 3-dimensional modeling program originally used by the petroleum industry for fractured rocks and only this year tailored for environmental and contamination problems in order to reduce existing uncertainties. The goal is, to draw up a conceptional model of the subsoil pollution migration which could be applied in the course of in-situ tests or for the purpose of later groundwater modeling. The investigations planned by the second investigation phase in preparation of the intended DNBA treatment of the contamination included the following actions: HPC Envirotec France Together we are strong. – Groundwater sampling for physicalchemical, microbiological and ecotoxicological analyses, – Application of microbiological passive samplers for recovery of biomass, – Implementation of tests for the feasibility study such as genetic tests by PCR for DNA sequences of the key enzymes of PCE and TCE degradation of autochthon bacteria, – Isotopic fractioning for quantification of present degradation processes and degradation rates within the principal aerobic situation existing presently, – Verification whether the microorganisms existing locally will be able to reduce chrome VI to chrome III and to entirely degrade VOC under the existing aerobic conditions when an electron donator is added (use of vegetal oil-nanoemulsion planned). If the biological VOC (TCE, PCE, etc.) degradation was insufficient or incomplete due to the lack of certain bacteria, for example, a bacterial consortium, a special microbial consortium with „dehalococcoides restrictus, multivorans and ethenogenes“ would be added to investigate the entire microbiological degradation process of VOCs (including vinyl chloride) to ethene. Furthermore, it would also be possible to apply lacking electron acceptors. TCE contaminant plue The target of this N(B)A feasibility study, which next year will be further developed by in-situ pilot tests, is focused on the improvement of the DNBA method applied. Verification and evaluation of the method applied will then be carried out during pilot tests in the two identified contamination. The aim of these innovative investigation methods presented and the remediation methods planned is to find an alternative to traditional and expensive groundwater treatment methods as pump & treat. Special interest was also paid to the toxicological exposition risk quantification carried out, which allowed us to determine site-specific remediation target values in preparation of the project, which provide maximum legal safety for the site responsible without having to resort to lower quality targets such as for drinking water production (similar to German or French thresholds). Tectonic disturbance running diagonally across the site Our experience gained from other project sites by application of innovative investigation and remediation measures makes us confident that together with the competent authorities and the client we will finally find and apply an optimal costbenefit solution also for this complex site. Thomas Grauf R&D-Department t.grauf@hpc-envirotec.com Dr. Frank Karg President CEO of HPC Envirotec and Scientific Director of HPC Group frank.karg@hpc-envirotec.com September 2009 www.hpc.ag 15
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France – Greece – Austria – Poland - HPC AG

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