caa a22 4500 445814594 CHVBK 20180317145222.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10040-010-0662-5 doi (NATIONALLICENCE)springer-10.1007/s10040-010-0662-5 Tritium-helium groundwater age used to constrain a groundwater flow model of a valley-fill aquifer contaminated with trichloroethylene (Quebec, Canada) [Elektronische Daten] [Samantha Murphy, Thomas Ouellon, Jean-Marc Ballard, René Lefebvre, Ian Clark] Utilisation de l'âge tritium-hélium d'une nappe pour borner un modèle d'écoulement d'aquifère alluvial contaminé par du trichloréthylène (Québec, Canada) Tritium-helium groundwater dating was carried out in a trichloroethylene (TCE)-contaminated valley-fill aquifer system in Quebec, Canada, where a numerical groundwater flow model was developed. Forty seven discrete groundwater and dissolved gas samples were obtained along two flow paths originating from known TCE source zones whose related plumes converge down gradient to form a single plume. Sampling points in monitoring wells were projected onto vertical sections showing particle tracks along the two flow paths. At these points, simulated advective ages obtained from particle tracking were matched to tritium-helium ages using different porosity values; the best match was 0.35. Ages were also obtained above and below a prodeltaic silty aquitard in a portion of the aquifer where some source zones are located, which provide groundwater and TCE transit times through the aquitard as well as a mean vertical hydraulic conductivity that agrees with previous estimates used in the model. In certain locations, anomalously old ages associated with high terrigenic 4He indicate areas where groundwater from the underlying proglacial unit flows upward into the deltaic sand aquifer through aquitard windows. Upflow locations correspond with increased TCE concentrations, suggesting significant TCE provenance through the proglacial unit originating from a previously unrecognized TCE source zone. Springer-Verlag, 2010 Tritium-helium groundwater dating nationallicence Numerical modeling nationallicence Model validation nationallicence Groundwater transit time nationallicence Canada nationallicence Murphy Samantha Department of Earth Sciences, University of Ottawa, 140 Louis Pasteur, K1N 6N5, Ottawa, ON, Canada aut Ouellon Thomas Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490 de la Couronne, G1K 9A9, Quebec City, QC, Canada aut Ballard Jean-Marc Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490 de la Couronne, G1K 9A9, Quebec City, QC, Canada aut Lefebvre René Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490 de la Couronne, G1K 9A9, Quebec City, QC, Canada aut Clark Ian Department of Earth Sciences, University of Ottawa, 140 Louis Pasteur, K1N 6N5, Ottawa, ON, Canada aut Hydrogeology Journal Springer-Verlag 19/1(2011-02-01), 195-207 1431-2174 19:1<195 2011 19 10040 https://doi.org/10.1007/s10040-010-0662-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-010-0662-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Murphy Samantha Department of Earth Sciences, University of Ottawa, 140 Louis Pasteur, K1N 6N5, Ottawa, ON, Canada aut NATIONALLICENCE 700 1- Ouellon Thomas Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490 de la Couronne, G1K 9A9, Quebec City, QC, Canada aut NATIONALLICENCE 700 1- Ballard Jean-Marc Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490 de la Couronne, G1K 9A9, Quebec City, QC, Canada aut NATIONALLICENCE 700 1- Lefebvre René Institut national de la recherche scientifique, Centre - Eau Terre Environnement, 490 de la Couronne, G1K 9A9, Quebec City, QC, Canada aut NATIONALLICENCE 700 1- Clark Ian Department of Earth Sciences, University of Ottawa, 140 Louis Pasteur, K1N 6N5, Ottawa, ON, Canada aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/1(2011-02-01), 195-207 1431-2174 19:1<195 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer