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TitleAssessing the integrity of aquitards: the Newmarket Till at Ajax
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorRashtchi, R; Al, T; Cornett, J; Gerber, R; Russell, H A JORCID logo
SourceRegional-scale groundwater geoscience in southern Ontario: an Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario geoscientists open house; by Russell, H A JORCID logo; Ford, D; Priebe, E H; Holysh, S; Geological Survey of Canada, Open File 8363, 2018 p. 36, Open Access logo Open Access
PublisherNatural Resources Canada
MeetingRegional-Scale Groundwater Geoscience in Southern Ontario: Open House; Guelph; CA; February 28 - March 1, 2018
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Regional-scale groundwater geoscience in southern Ontario: an Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario geoscientists open house
File formatpdf
NTS30M/13; 30M/14; 30M/15; 30M/16; 31C/04; 31D/01; 31D/02; 31D/03; 31D/04
AreaAjax; Newmarket; Aurora; Whitby; Toronto; Port Hope; Trenton
Lat/Long WENS -80.0000 -77.7500 44.2500 43.7500
Subjectshydrogeology; surficial geology/geomorphology; geochemistry; groundwater; groundwater resources; groundwater regimes; groundwater flow; glacial deposits; tills; postglacial deposits; fluvial deposits; erosion; hydraulic conductivity; boreholes; core samples; pore water samples; chlorine; bromine; fluorine; nitrate; isotopic studies; oxygen isotopes; hydrogen isotopes; carbon isotopes; helium isotopes; modelling; Newmarket Till; Lower Sediment; Oak Ridges Moraine; Phanerozoic; Cenozoic; Quaternary
ProgramGroundwater Geoscience Aquifer Assessment & support to mapping
Released2018 02 16
AbstractThe Newmarket Till is a regional aquitard in southern Ontario that overlies the Illinoian to Middle Wisconsinan Lower Sediment and is overlain by the Oak Ridges Moraine. Geological investigations have mapped the distribution of the till and it is understood that erosional channels, subsequently infilled with fluvial material, breach the till and may create enhanced hydraulic connection between overlying and underlying aquifers. However, little is known about the protective capability of the Newmarket Till where it is intact. This knowledge gap is being addressed by investigations of the rates and mechanisms for transport of natural and anthropogenic tracers in the porewater of the till. The research program was initiated in October 2017 with the coring of a new borehole at Sideline 4 near the intersection of highways 407 and 412, north of Ajax, Ontario. Vertical concentration profiles are generated for natural tracers by subsampling drill cores and then extracting porewater to measure the chemical (Cl, Br, F, NO3) and isotopic composition (delta-18O, delta-2H, delta-13C, 3H, 3He/4He). By coupling the tracer concentration profiles with a one-dimensional numerical transport model, we will calculate the rates of diffusive and advective transport across the aquitard.
Summary(Plain Language Summary, not published)
Proceedings for a workshop in Guelph Ontario as part of the program S&T exchange. Abstracts have been contributed by Ontario Geological Survey, Ministry of Environment and Climate Change, Conservation Authorities, Universities, private sector, and Unites States Geological Survey.

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