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As and F in southern Ontario's Glacial Aquifers, Analyses,…
As and F
in southern Ontario's
Glacial Aquifers
Key Findings
Underlying As- and F-bearing bedrock - likely geogenic sources of As and F in drilled wells
High As and F in bored/dug wells - may relate to phosphate fertilizer
Presence of silty-clayey glacial till - elevates As and F in drilled wells
Bored/Dug wells of Bevelled Till Plains - susceptible to As contamination
Bored/Dug wells of Undrumlinized and Bevelled Till Plains - susceptible to F contamination
Presence of sandy till - attenuates As and F in drilled wells
Bored/dug and drilled wells of Drumlinized Till Plains and Drumlins - relatively safe from F contamination
Drilled wells of Sand Plains - relatively safe from As contamination
Analyses
Statistical - OLS, GWR and spatial autocorrelation
Geospatial mapping
Groundwater geochemistry data
Physiographic map
Surficial geology map
Landuse map
As and F concentrations
Physiography
Texture of surficial deposits
Texture of glacial till
Well depth
Other chemical factors - F, As & Cd
Geochemical factors - ORP
Paleozoic bedrock formations map
Bedrock formations
224 bored/dug wells
291
drilled
wells