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TitleCo-existence of industrial organic contaminant plumes with municipal water supply wells in fractured rock aquifers
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AuthorParker, B L; Maldaner, C H; Olesiuk, J B
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 J; Ford, D; Priebe, E H; Holysh, S; Geological Survey of Canada, Open File 8363, 2018 p. 30, https://doi.org/10.4095/306558
Year2018
PublisherNatural Resources Canada
MeetingRegional-Scale Groundwater Geoscience in Southern Ontario: Open House; Guelph; CA; February 28 - March 1, 2018
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Russell, H A J; Ford, D; Priebe, E H; Holysh, S; (2018). Regional-scale groundwater geoscience in southern Ontario: an Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario geoscientists open house, Geological Survey of Canada, Open File 8363
File formatpdf
ProvinceOntario
NTS40P/08
AreaCambridge
Lat/Long WENS -80.5000 -80.0000 43.5000 43.2500
Subjectshydrogeology; geochemistry; groundwater resources; groundwater; aquifers; groundwater geochemistry; pollutants; bedrock geology; structural features; fractures; lithology; sedimentary rocks; dolostones; water quality; groundwater pollution; water wells; modelling; pesticides; water supply; monitoring; Phanerozoic; Paleozoic; Silurian
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Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
ProgramAquifer Assessment & support to mapping, Groundwater Geoscience
Released2018 02 16
AbstractLong-term studies combining research and conventional methods are being conducted at DNAPL sites where the organic contaminant plumes co-exist in the same fractured sedimentary rock aquifer with municipal water supply wells. Two of the research sites overlay the horizontally layered, Silurian dolostone aquifer. The Cambridge site has a metolachlor pesticide plume detected nearly 1 km down-gradient at a municipal supply well 20 years after spills occurred. The Guelph site plume is TCE. The plumes were characterized in detail using high-resolution methods for identifying hydraulically active fractures and variable matrix conditions. The 3-D plume concentration characteristics have been monitored for more than a decade using depth-discrete multilevel systems. The plumes have evolved to nearly stationary position (steady-state) after three decades due to the combined effects of diffusion and sorption in the matrix with dispersion in a dense network of well-connected fractures. Degradation occurs in each of the plumes but is a secondary factor in terms of current plume extents. These research studies show that high resolution monitoring can be used to inform site conceptual models and decision-making by municipalities and regulatory agencies to allow these plumes to coexist within or proximal to municipal or private well fields without imposing excessive or arbitrary demands for subsurface source removal (i.e. remediation) or well abandonment.
GEOSCAN ID306558